arch/x86/kvm/x86.c

   1 /*
   2  * Kernel-based Virtual Machine driver for Linux
   3  *
   4  * derived from drivers/kvm/kvm_main.c
   5  *
   6  * Copyright (C) 2006 Qumranet, Inc.
   7  * Copyright (C) 2008 Qumranet, Inc.
   8  * Copyright IBM Corporation, 2008
   9  * Copyright 2010 Red Hat, Inc. and/or its affiliates.
  10  *
  11  * Authors:
  12  *   Avi Kivity   <avi@qumranet.com>
  13  *   Yaniv Kamay  <yaniv@qumranet.com>
  14  *   Amit Shah    <amit.shah@qumranet.com>
  15  *   Ben-Ami Yassour <benami@il.ibm.com>
  16  *
  17  * This work is licensed under the terms of the GNU GPL, version 2.  See
  18  * the COPYING file in the top-level directory.
  19  *
  20  */
  21
  22 #include <linux/kvm_host.h>
  23 #include "irq.h"
  24 #include "mmu.h"
  25 #include "i8254.h"
  26 #include "tss.h"
  27 #include "kvm_cache_regs.h"
  28 #include "x86.h"
  29
  30 #include <linux/clocksource.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/kvm.h>
  33 #include <linux/fs.h>
  34 #include <linux/vmalloc.h>
  35 #include <linux/module.h>
  36 #include <linux/mman.h>
  37 #include <linux/highmem.h>
  38 #include <linux/iommu.h>
  39 #include <linux/intel-iommu.h>
  40 #include <linux/cpufreq.h>
  41 #include <linux/user-return-notifier.h>
  42 #include <linux/srcu.h>
  43 #include <linux/slab.h>
  44 #include <linux/perf_event.h>
  45 #include <linux/uaccess.h>
  46 #include <linux/hash.h>
  47 #include <trace/events/kvm.h>
  48
  49 #define CREATE_TRACE_POINTS
  50 #include "trace.h"
  51
  52 #include <asm/debugreg.h>
  53 #include <asm/msr.h>
  54 #include <asm/desc.h>
  55 #include <asm/mtrr.h>
  56 #include <asm/mce.h>
  57 #include <asm/i387.h>
  58 #include <asm/xcr.h>
  59 #include <asm/pvclock.h>
  60 #include <asm/div64.h>
  61
  62 #define MAX_IO_MSRS 256
  63 #define KVM_MAX_MCE_BANKS 32
  64 #define KVM_MCE_CAP_SUPPORTED (MCG_CTL_P | MCG_SER_P)
  65
  66 #define emul_to_vcpu(ctxt) \
  67         container_of(ctxt, struct kvm_vcpu, arch.emulate_ctxt)
  68
  69 /* EFER defaults:
  70  * - enable syscall per default because its emulated by KVM
  71  * - enable LME and LMA per default on 64 bit KVM
  72  */
  73 #ifdef CONFIG_X86_64
  74 static
  75 u64 __read_mostly efer_reserved_bits = ~((u64)(EFER_SCE | EFER_LME | EFER_LMA));
  76 #else
  77 static u64 __read_mostly efer_reserved_bits = ~((u64)EFER_SCE);
  78 #endif
  79
  80 #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
  81 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
  82
  83 static void update_cr8_intercept(struct kvm_vcpu *vcpu);
  84 static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
  85                                     struct kvm_cpuid_entry2 __user *entries);
  86
  87 struct kvm_x86_ops *kvm_x86_ops;
  88 EXPORT_SYMBOL_GPL(kvm_x86_ops);
  89
  90 int ignore_msrs = 0;
  91 module_param_named(ignore_msrs, ignore_msrs, bool, S_IRUGO | S_IWUSR);
  92
  93 bool kvm_has_tsc_control;
  94 EXPORT_SYMBOL_GPL(kvm_has_tsc_control);
  95 u32  kvm_max_guest_tsc_khz;
  96 EXPORT_SYMBOL_GPL(kvm_max_guest_tsc_khz);
  97
  98 #define KVM_NR_SHARED_MSRS 16
  99
 100 struct kvm_shared_msrs_global {
 101         int nr;
 102         u32 msrs[KVM_NR_SHARED_MSRS];
 103 };
 104
 105 struct kvm_shared_msrs {
 106         struct user_return_notifier urn;
 107         bool registered;
 108         struct kvm_shared_msr_values {
 109                 u64 host;
 110                 u64 curr;
 111         } values[KVM_NR_SHARED_MSRS];
 112 };
 113
 114 static struct kvm_shared_msrs_global __read_mostly shared_msrs_global;
 115 static DEFINE_PER_CPU(struct kvm_shared_msrs, shared_msrs);
 116
 117 struct kvm_stats_debugfs_item debugfs_entries[] = {
 118         { "pf_fixed", VCPU_STAT(pf_fixed) },
 119         { "pf_guest", VCPU_STAT(pf_guest) },
 120         { "tlb_flush", VCPU_STAT(tlb_flush) },
 121         { "invlpg", VCPU_STAT(invlpg) },
 122         { "exits", VCPU_STAT(exits) },
 123         { "io_exits", VCPU_STAT(io_exits) },
 124         { "mmio_exits", VCPU_STAT(mmio_exits) },
 125         { "signal_exits", VCPU_STAT(signal_exits) },
 126         { "irq_window", VCPU_STAT(irq_window_exits) },
 127         { "nmi_window", VCPU_STAT(nmi_window_exits) },
 128         { "halt_exits", VCPU_STAT(halt_exits) },
 129         { "halt_wakeup", VCPU_STAT(halt_wakeup) },
 130         { "hypercalls", VCPU_STAT(hypercalls) },
 131         { "request_irq", VCPU_STAT(request_irq_exits) },
 132         { "irq_exits", VCPU_STAT(irq_exits) },
 133         { "host_state_reload", VCPU_STAT(host_state_reload) },
 134         { "efer_reload", VCPU_STAT(efer_reload) },
 135         { "fpu_reload", VCPU_STAT(fpu_reload) },
 136         { "insn_emulation", VCPU_STAT(insn_emulation) },
 137         { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) },
 138         { "irq_injections", VCPU_STAT(irq_injections) },
 139         { "nmi_injections", VCPU_STAT(nmi_injections) },
 140         { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) },
 141         { "mmu_pte_write", VM_STAT(mmu_pte_write) },
 142         { "mmu_pte_updated", VM_STAT(mmu_pte_updated) },
 143         { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) },
 144         { "mmu_flooded", VM_STAT(mmu_flooded) },
 145         { "mmu_recycled", VM_STAT(mmu_recycled) },
 146         { "mmu_cache_miss", VM_STAT(mmu_cache_miss) },
 147         { "mmu_unsync", VM_STAT(mmu_unsync) },
 148         { "remote_tlb_flush", VM_STAT(remote_tlb_flush) },
 149         { "largepages", VM_STAT(lpages) },
 150         { NULL }
 151 };
 152
 153 u64 __read_mostly host_xcr0;
 154
 155 int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt);
 156
 157 static inline void kvm_async_pf_hash_reset(struct kvm_vcpu *vcpu)
 158 {
 159         int i;
 160         for (i = 0; i < roundup_pow_of_two(ASYNC_PF_PER_VCPU); i++)
 161                 vcpu->arch.apf.gfns[i] = ~0;
 162 }
 163
 164 static void kvm_on_user_return(struct user_return_notifier *urn)
 165 {
 166         unsigned slot;
 167         struct kvm_shared_msrs *locals
 168                 = container_of(urn, struct kvm_shared_msrs, urn);
 169         struct kvm_shared_msr_values *values;
 170
 171         for (slot = 0; slot < shared_msrs_global.nr; ++slot) {
 172                 values = &locals->values[slot];
 173                 if (values->host != values->curr) {
 174                         wrmsrl(shared_msrs_global.msrs[slot], values->host);
 175                         values->curr = values->host;
 176                 }
 177         }
 178         locals->registered = false;
 179         user_return_notifier_unregister(urn);
 180 }
 181
 182 static void shared_msr_update(unsigned slot, u32 msr)
 183 {
 184         struct kvm_shared_msrs *smsr;
 185         u64 value;
 186
 187         smsr = &__get_cpu_var(shared_msrs);
 188         /* only read, and nobody should modify it at this time,
 189          * so don't need lock */
 190         if (slot >= shared_msrs_global.nr) {
 191                 printk(KERN_ERR "kvm: invalid MSR slot!");
 192                 return;
 193         }
 194         rdmsrl_safe(msr, &value);
 195         smsr->values[slot].host = value;
 196         smsr->values[slot].curr = value;
 197 }
 198
 199 void kvm_define_shared_msr(unsigned slot, u32 msr)
 200 {
 201         if (slot >= shared_msrs_global.nr)
 202                 shared_msrs_global.nr = slot + 1;
 203         shared_msrs_global.msrs[slot] = msr;
 204         /* we need ensured the shared_msr_global have been updated */
 205         smp_wmb();
 206 }
 207 EXPORT_SYMBOL_GPL(kvm_define_shared_msr);
 208
 209 static void kvm_shared_msr_cpu_online(void)
 210 {
 211         unsigned i;
 212
 213         for (i = 0; i < shared_msrs_global.nr; ++i)
 214                 shared_msr_update(i, shared_msrs_global.msrs[i]);
 215 }
 216
 217 void kvm_set_shared_msr(unsigned slot, u64 value, u64 mask)
 218 {
 219         struct kvm_shared_msrs *smsr = &__get_cpu_var(shared_msrs);
 220
 221         if (((value ^ smsr->values[slot].curr) & mask) == 0)
 222                 return;
 223         smsr->values[slot].curr = value;
 224         wrmsrl(shared_msrs_global.msrs[slot], value);
 225         if (!smsr->registered) {
 226                 smsr->urn.on_user_return = kvm_on_user_return;
 227                 user_return_notifier_register(&smsr->urn);
 228                 smsr->registered = true;
 229         }
 230 }
 231 EXPORT_SYMBOL_GPL(kvm_set_shared_msr);
 232
 233 static void drop_user_return_notifiers(void *ignore)
 234 {
 235         struct kvm_shared_msrs *smsr = &__get_cpu_var(shared_msrs);
 236
 237         if (smsr->registered)
 238                 kvm_on_user_return(&smsr->urn);
 239 }
 240
 241 u64 kvm_get_apic_base(struct kvm_vcpu *vcpu)
 242 {
 243         if (irqchip_in_kernel(vcpu->kvm))
 244                 return vcpu->arch.apic_base;
 245         else
 246                 return vcpu->arch.apic_base;
 247 }
 248 EXPORT_SYMBOL_GPL(kvm_get_apic_base);
 249
 250 void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data)
 251 {
 252         /* TODO: reserve bits check */
 253         if (irqchip_in_kernel(vcpu->kvm))
 254                 kvm_lapic_set_base(vcpu, data);
 255         else
 256                 vcpu->arch.apic_base = data;
 257 }
 258 EXPORT_SYMBOL_GPL(kvm_set_apic_base);
 259
 260 #define EXCPT_BENIGN            0
 261 #define EXCPT_CONTRIBUTORY      1
 262 #define EXCPT_PF                2
 263
 264 static int exception_class(int vector)
 265 {
 266         switch (vector) {
 267         case PF_VECTOR:
 268                 return EXCPT_PF;
 269         case DE_VECTOR:
 270         case TS_VECTOR:
 271         case NP_VECTOR:
 272         case SS_VECTOR:
 273         case GP_VECTOR:
 274                 return EXCPT_CONTRIBUTORY;
 275         default:
 276                 break;
 277         }
 278         return EXCPT_BENIGN;
 279 }
 280
 281 static void kvm_multiple_exception(struct kvm_vcpu *vcpu,
 282                 unsigned nr, bool has_error, u32 error_code,
 283                 bool reinject)
 284 {
 285         u32 prev_nr;
 286         int class1, class2;
 287
 288         kvm_make_request(KVM_REQ_EVENT, vcpu);
 289
 290         if (!vcpu->arch.exception.pending) {
 291         queue:
 292                 vcpu->arch.exception.pending = true;
 293                 vcpu->arch.exception.has_error_code = has_error;
 294                 vcpu->arch.exception.nr = nr;
 295                 vcpu->arch.exception.error_code = error_code;
 296                 vcpu->arch.exception.reinject = reinject;
 297                 return;
 298         }
 299
 300         /* to check exception */
 301         prev_nr = vcpu->arch.exception.nr;
 302         if (prev_nr == DF_VECTOR) {
 303                 /* triple fault -> shutdown */
 304                 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
 305                 return;
 306         }
 307         class1 = exception_class(prev_nr);
 308         class2 = exception_class(nr);
 309         if ((class1 == EXCPT_CONTRIBUTORY && class2 == EXCPT_CONTRIBUTORY)
 310                 || (class1 == EXCPT_PF && class2 != EXCPT_BENIGN)) {
 311                 /* generate double fault per SDM Table 5-5 */
 312                 vcpu->arch.exception.pending = true;
 313                 vcpu->arch.exception.has_error_code = true;
 314                 vcpu->arch.exception.nr = DF_VECTOR;
 315                 vcpu->arch.exception.error_code = 0;
 316         } else
 317                 /* replace previous exception with a new one in a hope
 318                    that instruction re-execution will regenerate lost
 319                    exception */
 320                 goto queue;
 321 }
 322
 323 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr)
 324 {
 325         kvm_multiple_exception(vcpu, nr, false, 0, false);
 326 }
 327 EXPORT_SYMBOL_GPL(kvm_queue_exception);
 328
 329 void kvm_requeue_exception(struct kvm_vcpu *vcpu, unsigned nr)
 330 {
 331         kvm_multiple_exception(vcpu, nr, false, 0, true);
 332 }
 333 EXPORT_SYMBOL_GPL(kvm_requeue_exception);
 334
 335 void kvm_complete_insn_gp(struct kvm_vcpu *vcpu, int err)
 336 {
 337         if (err)
 338                 kvm_inject_gp(vcpu, 0);
 339         else
 340                 kvm_x86_ops->skip_emulated_instruction(vcpu);
 341 }
 342 EXPORT_SYMBOL_GPL(kvm_complete_insn_gp);
 343
 344 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault)
 345 {
 346         ++vcpu->stat.pf_guest;
 347         vcpu->arch.cr2 = fault->address;
 348         kvm_queue_exception_e(vcpu, PF_VECTOR, fault->error_code);
 349 }
 350
 351 void kvm_propagate_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault)
 352 {
 353         if (mmu_is_nested(vcpu) && !fault->nested_page_fault)
 354                 vcpu->arch.nested_mmu.inject_page_fault(vcpu, fault);
 355         else
 356                 vcpu->arch.mmu.inject_page_fault(vcpu, fault);
 357 }
 358
 359 void kvm_inject_nmi(struct kvm_vcpu *vcpu)
 360 {
 361         kvm_make_request(KVM_REQ_EVENT, vcpu);
 362         vcpu->arch.nmi_pending = 1;
 363 }
 364 EXPORT_SYMBOL_GPL(kvm_inject_nmi);
 365
 366 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
 367 {
 368         kvm_multiple_exception(vcpu, nr, true, error_code, false);
 369 }
 370 EXPORT_SYMBOL_GPL(kvm_queue_exception_e);
 371
 372 void kvm_requeue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
 373 {
 374         kvm_multiple_exception(vcpu, nr, true, error_code, true);
 375 }
 376 EXPORT_SYMBOL_GPL(kvm_requeue_exception_e);
 377
 378 /*
 379  * Checks if cpl <= required_cpl; if true, return true.  Otherwise queue
 380  * a #GP and return false.
 381  */
 382 bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl)
 383 {
 384         if (kvm_x86_ops->get_cpl(vcpu) <= required_cpl)
 385                 return true;
 386         kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
 387         return false;
 388 }
 389 EXPORT_SYMBOL_GPL(kvm_require_cpl);
 390
 391 /*
 392  * This function will be used to read from the physical memory of the currently
 393  * running guest. The difference to kvm_read_guest_page is that this function
 394  * can read from guest physical or from the guest's guest physical memory.
 395  */
 396 int kvm_read_guest_page_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
 397                             gfn_t ngfn, void *data, int offset, int len,
 398                             u32 access)
 399 {
 400         gfn_t real_gfn;
 401         gpa_t ngpa;
 402
 403         ngpa     = gfn_to_gpa(ngfn);
 404         real_gfn = mmu->translate_gpa(vcpu, ngpa, access);
 405         if (real_gfn == UNMAPPED_GVA)
 406                 return -EFAULT;
 407
 408         real_gfn = gpa_to_gfn(real_gfn);
 409
 410         return kvm_read_guest_page(vcpu->kvm, real_gfn, data, offset, len);
 411 }
 412 EXPORT_SYMBOL_GPL(kvm_read_guest_page_mmu);
 413
 414 int kvm_read_nested_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn,
 415                                void *data, int offset, int len, u32 access)
 416 {
 417         return kvm_read_guest_page_mmu(vcpu, vcpu->arch.walk_mmu, gfn,
 418                                        data, offset, len, access);
 419 }
 420
 421 /*
 422  * Load the pae pdptrs.  Return true is they are all valid.
 423  */
 424 int load_pdptrs(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, unsigned long cr3)
 425 {
 426         gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
 427         unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
 428         int i;
 429         int ret;
 430         u64 pdpte[ARRAY_SIZE(mmu->pdptrs)];
 431
 432         ret = kvm_read_guest_page_mmu(vcpu, mmu, pdpt_gfn, pdpte,
 433                                       offset * sizeof(u64), sizeof(pdpte),
 434                                       PFERR_USER_MASK|PFERR_WRITE_MASK);
 435         if (ret < 0) {
 436                 ret = 0;
 437                 goto out;
 438         }
 439         for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
 440                 if (is_present_gpte(pdpte[i]) &&
 441                     (pdpte[i] & vcpu->arch.mmu.rsvd_bits_mask[0][2])) {
 442                         ret = 0;
 443                         goto out;
 444                 }
 445         }
 446         ret = 1;
 447
 448         memcpy(mmu->pdptrs, pdpte, sizeof(mmu->pdptrs));
 449         __set_bit(VCPU_EXREG_PDPTR,
 450                   (unsigned long *)&vcpu->arch.regs_avail);
 451         __set_bit(VCPU_EXREG_PDPTR,
 452                   (unsigned long *)&vcpu->arch.regs_dirty);
 453 out:
 454
 455         return ret;
 456 }
 457 EXPORT_SYMBOL_GPL(load_pdptrs);
 458
 459 static bool pdptrs_changed(struct kvm_vcpu *vcpu)
 460 {
 461         u64 pdpte[ARRAY_SIZE(vcpu->arch.walk_mmu->pdptrs)];
 462         bool changed = true;
 463         int offset;
 464         gfn_t gfn;
 465         int r;
 466
 467         if (is_long_mode(vcpu) || !is_pae(vcpu))
 468                 return false;
 469
 470         if (!test_bit(VCPU_EXREG_PDPTR,
 471                       (unsigned long *)&vcpu->arch.regs_avail))
 472                 return true;
 473
 474         gfn = (kvm_read_cr3(vcpu) & ~31u) >> PAGE_SHIFT;
 475         offset = (kvm_read_cr3(vcpu) & ~31u) & (PAGE_SIZE - 1);
 476         r = kvm_read_nested_guest_page(vcpu, gfn, pdpte, offset, sizeof(pdpte),
 477                                        PFERR_USER_MASK | PFERR_WRITE_MASK);
 478         if (r < 0)
 479                 goto out;
 480         changed = memcmp(pdpte, vcpu->arch.walk_mmu->pdptrs, sizeof(pdpte)) != 0;
 481 out:
 482
 483         return changed;
 484 }
 485
 486 int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 487 {
 488         unsigned long old_cr0 = kvm_read_cr0(vcpu);
 489         unsigned long update_bits = X86_CR0_PG | X86_CR0_WP |
 490                                     X86_CR0_CD | X86_CR0_NW;
 491
 492         cr0 |= X86_CR0_ET;
 493
 494 #ifdef CONFIG_X86_64
 495         if (cr0 & 0xffffffff00000000UL)
 496                 return 1;
 497 #endif
 498
 499         cr0 &= ~CR0_RESERVED_BITS;
 500
 501         if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD))
 502                 return 1;
 503
 504         if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE))
 505                 return 1;
 506
 507         if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
 508 #ifdef CONFIG_X86_64
 509                 if ((vcpu->arch.efer & EFER_LME)) {
 510                         int cs_db, cs_l;
 511
 512                         if (!is_pae(vcpu))
 513                                 return 1;
 514                         kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
 515                         if (cs_l)
 516                                 return 1;
 517                 } else
 518 #endif
 519                 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->arch.walk_mmu,
 520                                                  kvm_read_cr3(vcpu)))
 521                         return 1;
 522         }
 523
 524         kvm_x86_ops->set_cr0(vcpu, cr0);
 525
 526         if ((cr0 ^ old_cr0) & X86_CR0_PG) {
 527                 kvm_clear_async_pf_completion_queue(vcpu);
 528                 kvm_async_pf_hash_reset(vcpu);
 529         }
 530
 531         if ((cr0 ^ old_cr0) & update_bits)
 532                 kvm_mmu_reset_context(vcpu);
 533         return 0;
 534 }
 535 EXPORT_SYMBOL_GPL(kvm_set_cr0);
 536
 537 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
 538 {
 539         (void)kvm_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~0x0eul) | (msw & 0x0f));
 540 }
 541 EXPORT_SYMBOL_GPL(kvm_lmsw);
 542
 543 int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
 544 {
 545         u64 xcr0;
 546
 547         /* Only support XCR_XFEATURE_ENABLED_MASK(xcr0) now  */
 548         if (index != XCR_XFEATURE_ENABLED_MASK)
 549                 return 1;
 550         xcr0 = xcr;
 551         if (kvm_x86_ops->get_cpl(vcpu) != 0)
 552                 return 1;
 553         if (!(xcr0 & XSTATE_FP))
 554                 return 1;
 555         if ((xcr0 & XSTATE_YMM) && !(xcr0 & XSTATE_SSE))
 556                 return 1;
 557         if (xcr0 & ~host_xcr0)
 558                 return 1;
 559         vcpu->arch.xcr0 = xcr0;
 560         vcpu->guest_xcr0_loaded = 0;
 561         return 0;
 562 }
 563
 564 int kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
 565 {
 566         if (__kvm_set_xcr(vcpu, index, xcr)) {
 567                 kvm_inject_gp(vcpu, 0);
 568                 return 1;
 569         }
 570         return 0;
 571 }
 572 EXPORT_SYMBOL_GPL(kvm_set_xcr);
 573
 574 static bool guest_cpuid_has_xsave(struct kvm_vcpu *vcpu)
 575 {
 576         struct kvm_cpuid_entry2 *best;
 577
 578         best = kvm_find_cpuid_entry(vcpu, 1, 0);
 579         return best && (best->ecx & bit(X86_FEATURE_XSAVE));
 580 }
 581
 582 static void update_cpuid(struct kvm_vcpu *vcpu)
 583 {
 584         struct kvm_cpuid_entry2 *best;
 585
 586         best = kvm_find_cpuid_entry(vcpu, 1, 0);
 587         if (!best)
 588                 return;
 589
 590         /* Update OSXSAVE bit */
 591         if (cpu_has_xsave && best->function == 0x1) {
 592                 best->ecx &= ~(bit(X86_FEATURE_OSXSAVE));
 593                 if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE))
 594                         best->ecx |= bit(X86_FEATURE_OSXSAVE);
 595         }
 596 }
 597
 598 int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
 599 {
 600         unsigned long old_cr4 = kvm_read_cr4(vcpu);
 601         unsigned long pdptr_bits = X86_CR4_PGE | X86_CR4_PSE | X86_CR4_PAE;
 602
 603         if (cr4 & CR4_RESERVED_BITS)
 604                 return 1;
 605
 606         if (!guest_cpuid_has_xsave(vcpu) && (cr4 & X86_CR4_OSXSAVE))
 607                 return 1;
 608
 609         if (is_long_mode(vcpu)) {
 610                 if (!(cr4 & X86_CR4_PAE))
 611                         return 1;
 612         } else if (is_paging(vcpu) && (cr4 & X86_CR4_PAE)
 613                    && ((cr4 ^ old_cr4) & pdptr_bits)
 614                    && !load_pdptrs(vcpu, vcpu->arch.walk_mmu,
 615                                    kvm_read_cr3(vcpu)))
 616                 return 1;
 617
 618         if (cr4 & X86_CR4_VMXE)
 619                 return 1;
 620
 621         kvm_x86_ops->set_cr4(vcpu, cr4);
 622
 623         if ((cr4 ^ old_cr4) & pdptr_bits)
 624                 kvm_mmu_reset_context(vcpu);
 625
 626         if ((cr4 ^ old_cr4) & X86_CR4_OSXSAVE)
 627                 update_cpuid(vcpu);
 628
 629         return 0;
 630 }
 631 EXPORT_SYMBOL_GPL(kvm_set_cr4);
 632
 633 int kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
 634 {
 635         if (cr3 == kvm_read_cr3(vcpu) && !pdptrs_changed(vcpu)) {
 636                 kvm_mmu_sync_roots(vcpu);
 637                 kvm_mmu_flush_tlb(vcpu);
 638                 return 0;
 639         }
 640
 641         if (is_long_mode(vcpu)) {
 642                 if (cr3 & CR3_L_MODE_RESERVED_BITS)
 643                         return 1;
 644         } else {
 645                 if (is_pae(vcpu)) {
 646                         if (cr3 & CR3_PAE_RESERVED_BITS)
 647                                 return 1;
 648                         if (is_paging(vcpu) &&
 649                             !load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3))
 650                                 return 1;
 651                 }
 652                 /*
 653                  * We don't check reserved bits in nonpae mode, because
 654                  * this isn't enforced, and VMware depends on this.
 655                  */
 656         }
 657
 658         /*
 659          * Does the new cr3 value map to physical memory? (Note, we
 660          * catch an invalid cr3 even in real-mode, because it would
 661          * cause trouble later on when we turn on paging anyway.)
 662          *
 663          * A real CPU would silently accept an invalid cr3 and would
 664          * attempt to use it - with largely undefined (and often hard
 665          * to debug) behavior on the guest side.
 666          */
 667         if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
 668                 return 1;
 669         vcpu->arch.cr3 = cr3;
 670         __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail);
 671         vcpu->arch.mmu.new_cr3(vcpu);
 672         return 0;
 673 }
 674 EXPORT_SYMBOL_GPL(kvm_set_cr3);
 675
 676 int kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
 677 {
 678         if (cr8 & CR8_RESERVED_BITS)
 679                 return 1;
 680         if (irqchip_in_kernel(vcpu->kvm))
 681                 kvm_lapic_set_tpr(vcpu, cr8);
 682         else
 683                 vcpu->arch.cr8 = cr8;
 684         return 0;
 685 }
 686 EXPORT_SYMBOL_GPL(kvm_set_cr8);
 687
 688 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu)
 689 {
 690         if (irqchip_in_kernel(vcpu->kvm))
 691                 return kvm_lapic_get_cr8(vcpu);
 692         else
 693                 return vcpu->arch.cr8;
 694 }
 695 EXPORT_SYMBOL_GPL(kvm_get_cr8);
 696
 697 static int __kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
 698 {
 699         switch (dr) {
 700         case 0 ... 3:
 701                 vcpu->arch.db[dr] = val;
 702                 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP))
 703                         vcpu->arch.eff_db[dr] = val;
 704                 break;
 705         case 4:
 706                 if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
 707                         return 1; /* #UD */
 708                 /* fall through */
 709         case 6:
 710                 if (val & 0xffffffff00000000ULL)
 711                         return -1; /* #GP */
 712                 vcpu->arch.dr6 = (val & DR6_VOLATILE) | DR6_FIXED_1;
 713                 break;
 714         case 5:
 715                 if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
 716                         return 1; /* #UD */
 717                 /* fall through */
 718         default: /* 7 */
 719                 if (val & 0xffffffff00000000ULL)
 720                         return -1; /* #GP */
 721                 vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1;
 722                 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) {
 723                         kvm_x86_ops->set_dr7(vcpu, vcpu->arch.dr7);
 724                         vcpu->arch.switch_db_regs = (val & DR7_BP_EN_MASK);
 725                 }
 726                 break;
 727         }
 728
 729         return 0;
 730 }
 731
 732 int kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
 733 {
 734         int res;
 735
 736         res = __kvm_set_dr(vcpu, dr, val);
 737         if (res > 0)
 738                 kvm_queue_exception(vcpu, UD_VECTOR);
 739         else if (res < 0)
 740                 kvm_inject_gp(vcpu, 0);
 741
 742         return res;
 743 }
 744 EXPORT_SYMBOL_GPL(kvm_set_dr);
 745
 746 static int _kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val)
 747 {
 748         switch (dr) {
 749         case 0 ... 3:
 750                 *val = vcpu->arch.db[dr];
 751                 break;
 752         case 4:
 753                 if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
 754                         return 1;
 755                 /* fall through */
 756         case 6:
 757                 *val = vcpu->arch.dr6;
 758                 break;
 759         case 5:
 760                 if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
 761                         return 1;
 762                 /* fall through */
 763         default: /* 7 */
 764                 *val = vcpu->arch.dr7;
 765                 break;
 766         }
 767
 768         return 0;
 769 }
 770
 771 int kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val)
 772 {
 773         if (_kvm_get_dr(vcpu, dr, val)) {
 774                 kvm_queue_exception(vcpu, UD_VECTOR);
 775                 return 1;
 776         }
 777         return 0;
 778 }
 779 EXPORT_SYMBOL_GPL(kvm_get_dr);
 780
 781 /*
 782  * List of msr numbers which we expose to userspace through KVM_GET_MSRS
 783  * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
 784  *
 785  * This list is modified at module load time to reflect the
 786  * capabilities of the host cpu. This capabilities test skips MSRs that are
 787  * kvm-specific. Those are put in the beginning of the list.
 788  */
 789
 790 #define KVM_SAVE_MSRS_BEGIN     8
 791 static u32 msrs_to_save[] = {
 792         MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK,
 793         MSR_KVM_SYSTEM_TIME_NEW, MSR_KVM_WALL_CLOCK_NEW,
 794         HV_X64_MSR_GUEST_OS_ID, HV_X64_MSR_HYPERCALL,
 795         HV_X64_MSR_APIC_ASSIST_PAGE, MSR_KVM_ASYNC_PF_EN,
 796         MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
 797         MSR_STAR,
 798 #ifdef CONFIG_X86_64
 799         MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
 800 #endif
 801         MSR_IA32_TSC, MSR_IA32_CR_PAT, MSR_VM_HSAVE_PA
 802 };
 803
 804 static unsigned num_msrs_to_save;
 805
 806 static u32 emulated_msrs[] = {
 807         MSR_IA32_MISC_ENABLE,
 808         MSR_IA32_MCG_STATUS,
 809         MSR_IA32_MCG_CTL,
 810 };
 811
 812 static int set_efer(struct kvm_vcpu *vcpu, u64 efer)
 813 {
 814         u64 old_efer = vcpu->arch.efer;
 815
 816         if (efer & efer_reserved_bits)
 817                 return 1;
 818
 819         if (is_paging(vcpu)
 820             && (vcpu->arch.efer & EFER_LME) != (efer & EFER_LME))
 821                 return 1;
 822
 823         if (efer & EFER_FFXSR) {
 824                 struct kvm_cpuid_entry2 *feat;
 825
 826                 feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
 827                 if (!feat || !(feat->edx & bit(X86_FEATURE_FXSR_OPT)))
 828                         return 1;
 829         }
 830
 831         if (efer & EFER_SVME) {
 832                 struct kvm_cpuid_entry2 *feat;
 833
 834                 feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
 835                 if (!feat || !(feat->ecx & bit(X86_FEATURE_SVM)))
 836                         return 1;
 837         }
 838
 839         efer &= ~EFER_LMA;
 840         efer |= vcpu->arch.efer & EFER_LMA;
 841
 842         kvm_x86_ops->set_efer(vcpu, efer);
 843
 844         vcpu->arch.mmu.base_role.nxe = (efer & EFER_NX) && !tdp_enabled;
 845
 846         /* Update reserved bits */
 847         if ((efer ^ old_efer) & EFER_NX)
 848                 kvm_mmu_reset_context(vcpu);
 849
 850         return 0;
 851 }
 852
 853 void kvm_enable_efer_bits(u64 mask)
 854 {
 855        efer_reserved_bits &= ~mask;
 856 }
 857 EXPORT_SYMBOL_GPL(kvm_enable_efer_bits);
 858
 859
 860 /*
 861  * Writes msr value into into the appropriate "register".
 862  * Returns 0 on success, non-0 otherwise.
 863  * Assumes vcpu_load() was already called.
 864  */
 865 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
 866 {
 867         return kvm_x86_ops->set_msr(vcpu, msr_index, data);
 868 }
 869
 870 /*
 871  * Adapt set_msr() to msr_io()'s calling convention
 872  */
 873 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
 874 {
 875         return kvm_set_msr(vcpu, index, *data);
 876 }
 877
 878 static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock)
 879 {
 880         int version;
 881         int r;
 882         struct pvclock_wall_clock wc;
 883         struct timespec boot;
 884
 885         if (!wall_clock)
 886                 return;
 887
 888         r = kvm_read_guest(kvm, wall_clock, &version, sizeof(version));
 889         if (r)
 890                 return;
 891
 892         if (version & 1)
 893                 ++version;  /* first time write, random junk */
 894
 895         ++version;
 896
 897         kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
 898
 899         /*
 900          * The guest calculates current wall clock time by adding
 901          * system time (updated by kvm_guest_time_update below) to the
 902          * wall clock specified here.  guest system time equals host
 903          * system time for us, thus we must fill in host boot time here.
 904          */
 905         getboottime(&boot);
 906
 907         wc.sec = boot.tv_sec;
 908         wc.nsec = boot.tv_nsec;
 909         wc.version = version;
 910
 911         kvm_write_guest(kvm, wall_clock, &wc, sizeof(wc));
 912
 913         version++;
 914         kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
 915 }
 916
 917 static uint32_t div_frac(uint32_t dividend, uint32_t divisor)
 918 {
 919         uint32_t quotient, remainder;
 920
 921         /* Don't try to replace with do_div(), this one calculates
 922          * "(dividend << 32) / divisor" */
 923         __asm__ ( "divl %4"
 924                   : "=a" (quotient), "=d" (remainder)
 925                   : "0" (0), "1" (dividend), "r" (divisor) );
 926         return quotient;
 927 }
 928
 929 static void kvm_get_time_scale(uint32_t scaled_khz, uint32_t base_khz,
 930                                s8 *pshift, u32 *pmultiplier)
 931 {
 932         uint64_t scaled64;
 933         int32_t  shift = 0;
 934         uint64_t tps64;
 935         uint32_t tps32;
 936
 937         tps64 = base_khz * 1000LL;
 938         scaled64 = scaled_khz * 1000LL;
 939         while (tps64 > scaled64*2 || tps64 & 0xffffffff00000000ULL) {
 940                 tps64 >>= 1;
 941                 shift--;
 942         }
 943
 944         tps32 = (uint32_t)tps64;
 945         while (tps32 <= scaled64 || scaled64 & 0xffffffff00000000ULL) {
 946                 if (scaled64 & 0xffffffff00000000ULL || tps32 & 0x80000000)
 947                         scaled64 >>= 1;
 948                 else
 949                         tps32 <<= 1;
 950                 shift++;
 951         }
 952
 953         *pshift = shift;
 954         *pmultiplier = div_frac(scaled64, tps32);
 955
 956         pr_debug("%s: base_khz %u => %u, shift %d, mul %u\n",
 957                  __func__, base_khz, scaled_khz, shift, *pmultiplier);
 958 }
 959
 960 static inline u64 get_kernel_ns(void)
 961 {
 962         struct timespec ts;
 963
 964         WARN_ON(preemptible());
 965         ktime_get_ts(&ts);
 966         monotonic_to_bootbased(&ts);
 967         return timespec_to_ns(&ts);
 968 }
 969
 970 static DEFINE_PER_CPU(unsigned long, cpu_tsc_khz);
 971 unsigned long max_tsc_khz;
 972
 973 static inline int kvm_tsc_changes_freq(void)
 974 {
 975         int cpu = get_cpu();
 976         int ret = !boot_cpu_has(X86_FEATURE_CONSTANT_TSC) &&
 977                   cpufreq_quick_get(cpu) != 0;
 978         put_cpu();
 979         return ret;
 980 }
 981
 982 static u64 vcpu_tsc_khz(struct kvm_vcpu *vcpu)
 983 {
 984         if (vcpu->arch.virtual_tsc_khz)
 985                 return vcpu->arch.virtual_tsc_khz;
 986         else
 987                 return __this_cpu_read(cpu_tsc_khz);
 988 }
 989
 990 static inline u64 nsec_to_cycles(struct kvm_vcpu *vcpu, u64 nsec)
 991 {
 992         u64 ret;
 993
 994         WARN_ON(preemptible());
 995         if (kvm_tsc_changes_freq())
 996                 printk_once(KERN_WARNING
 997                  "kvm: unreliable cycle conversion on adjustable rate TSC\n");
 998         ret = nsec * vcpu_tsc_khz(vcpu);
 999         do_div(ret, USEC_PER_SEC);
1000         return ret;
1001 }
1002
1003 static void kvm_init_tsc_catchup(struct kvm_vcpu *vcpu, u32 this_tsc_khz)
1004 {
1005         /* Compute a scale to convert nanoseconds in TSC cycles */
1006         kvm_get_time_scale(this_tsc_khz, NSEC_PER_SEC / 1000,
1007                            &vcpu->arch.tsc_catchup_shift,
1008                            &vcpu->arch.tsc_catchup_mult);
1009 }
1010
1011 static u64 compute_guest_tsc(struct kvm_vcpu *vcpu, s64 kernel_ns)
1012 {
1013         u64 tsc = pvclock_scale_delta(kernel_ns-vcpu->arch.last_tsc_nsec,
1014                                       vcpu->arch.tsc_catchup_mult,
1015                                       vcpu->arch.tsc_catchup_shift);
1016         tsc += vcpu->arch.last_tsc_write;
1017         return tsc;
1018 }
1019
1020 void kvm_write_tsc(struct kvm_vcpu *vcpu, u64 data)
1021 {
1022         struct kvm *kvm = vcpu->kvm;
1023         u64 offset, ns, elapsed;
1024         unsigned long flags;
1025         s64 sdiff;
1026
1027         raw_spin_lock_irqsave(&kvm->arch.tsc_write_lock, flags);
1028         offset = kvm_x86_ops->compute_tsc_offset(vcpu, data);
1029         ns = get_kernel_ns();
1030         elapsed = ns - kvm->arch.last_tsc_nsec;
1031         sdiff = data - kvm->arch.last_tsc_write;
1032         if (sdiff < 0)
1033                 sdiff = -sdiff;
1034
1035         /*
1036          * Special case: close write to TSC within 5 seconds of
1037          * another CPU is interpreted as an attempt to synchronize
1038          * The 5 seconds is to accommodate host load / swapping as
1039          * well as any reset of TSC during the boot process.
1040          *
1041          * In that case, for a reliable TSC, we can match TSC offsets,
1042          * or make a best guest using elapsed value.
1043          */
1044         if (sdiff < nsec_to_cycles(vcpu, 5ULL * NSEC_PER_SEC) &&
1045             elapsed < 5ULL * NSEC_PER_SEC) {
1046                 if (!check_tsc_unstable()) {
1047                         offset = kvm->arch.last_tsc_offset;
1048                         pr_debug("kvm: matched tsc offset for %llu\n", data);
1049                 } else {
1050                         u64 delta = nsec_to_cycles(vcpu, elapsed);
1051                         offset += delta;
1052                         pr_debug("kvm: adjusted tsc offset by %llu\n", delta);
1053                 }
1054                 ns = kvm->arch.last_tsc_nsec;
1055         }
1056         kvm->arch.last_tsc_nsec = ns;
1057         kvm->arch.last_tsc_write = data;
1058         kvm->arch.last_tsc_offset = offset;
1059         kvm_x86_ops->write_tsc_offset(vcpu, offset);
1060         raw_spin_unlock_irqrestore(&kvm->arch.tsc_write_lock, flags);
1061
1062         /* Reset of TSC must disable overshoot protection below */
1063         vcpu->arch.hv_clock.tsc_timestamp = 0;
1064         vcpu->arch.last_tsc_write = data;
1065         vcpu->arch.last_tsc_nsec = ns;
1066 }
1067 EXPORT_SYMBOL_GPL(kvm_write_tsc);
1068
1069 static int kvm_guest_time_update(struct kvm_vcpu *v)
1070 {
1071         unsigned long flags;
1072         struct kvm_vcpu_arch *vcpu = &v->arch;
1073         void *shared_kaddr;
1074         unsigned long this_tsc_khz;
1075         s64 kernel_ns, max_kernel_ns;
1076         u64 tsc_timestamp;
1077
1078         /* Keep irq disabled to prevent changes to the clock */
1079         local_irq_save(flags);
1080         kvm_get_msr(v, MSR_IA32_TSC, &tsc_timestamp);
1081         kernel_ns = get_kernel_ns();
1082         this_tsc_khz = vcpu_tsc_khz(v);
1083         if (unlikely(this_tsc_khz == 0)) {
1084                 local_irq_restore(flags);
1085                 kvm_make_request(KVM_REQ_CLOCK_UPDATE, v);
1086                 return 1;
1087         }
1088
1089         /*
1090          * We may have to catch up the TSC to match elapsed wall clock
1091          * time for two reasons, even if kvmclock is used.
1092          *   1) CPU could have been running below the maximum TSC rate
1093          *   2) Broken TSC compensation resets the base at each VCPU
1094          *      entry to avoid unknown leaps of TSC even when running
1095          *      again on the same CPU.  This may cause apparent elapsed
1096          *      time to disappear, and the guest to stand still or run
1097          *      very slowly.
1098          */
1099         if (vcpu->tsc_catchup) {
1100                 u64 tsc = compute_guest_tsc(v, kernel_ns);
1101                 if (tsc > tsc_timestamp) {
1102                         kvm_x86_ops->adjust_tsc_offset(v, tsc - tsc_timestamp);
1103                         tsc_timestamp = tsc;
1104                 }
1105         }
1106
1107         local_irq_restore(flags);
1108
1109         if (!vcpu->time_page)
1110                 return 0;
1111
1112         /*
1113          * Time as measured by the TSC may go backwards when resetting the base
1114          * tsc_timestamp.  The reason for this is that the TSC resolution is
1115          * higher than the resolution of the other clock scales.  Thus, many
1116          * possible measurments of the TSC correspond to one measurement of any
1117          * other clock, and so a spread of values is possible.  This is not a
1118          * problem for the computation of the nanosecond clock; with TSC rates
1119          * around 1GHZ, there can only be a few cycles which correspond to one
1120          * nanosecond value, and any path through this code will inevitably
1121          * take longer than that.  However, with the kernel_ns value itself,
1122          * the precision may be much lower, down to HZ granularity.  If the
1123          * first sampling of TSC against kernel_ns ends in the low part of the
1124          * range, and the second in the high end of the range, we can get:
1125          *
1126          * (TSC - offset_low) * S + kns_old > (TSC - offset_high) * S + kns_new
1127          *
1128          * As the sampling errors potentially range in the thousands of cycles,
1129          * it is possible such a time value has already been observed by the
1130          * guest.  To protect against this, we must compute the system time as
1131          * observed by the guest and ensure the new system time is greater.
1132          */
1133         max_kernel_ns = 0;
1134         if (vcpu->hv_clock.tsc_timestamp && vcpu->last_guest_tsc) {
1135                 max_kernel_ns = vcpu->last_guest_tsc -
1136                                 vcpu->hv_clock.tsc_timestamp;
1137                 max_kernel_ns = pvclock_scale_delta(max_kernel_ns,
1138                                     vcpu->hv_clock.tsc_to_system_mul,
1139                                     vcpu->hv_clock.tsc_shift);
1140                 max_kernel_ns += vcpu->last_kernel_ns;
1141         }
1142
1143         if (unlikely(vcpu->hw_tsc_khz != this_tsc_khz)) {
1144                 kvm_get_time_scale(NSEC_PER_SEC / 1000, this_tsc_khz,
1145                                    &vcpu->hv_clock.tsc_shift,
1146                                    &vcpu->hv_clock.tsc_to_system_mul);
1147                 vcpu->hw_tsc_khz = this_tsc_khz;
1148         }
1149
1150         if (max_kernel_ns > kernel_ns)
1151                 kernel_ns = max_kernel_ns;
1152
1153         /* With all the info we got, fill in the values */
1154         vcpu->hv_clock.tsc_timestamp = tsc_timestamp;
1155         vcpu->hv_clock.system_time = kernel_ns + v->kvm->arch.kvmclock_offset;
1156         vcpu->last_kernel_ns = kernel_ns;
1157         vcpu->last_guest_tsc = tsc_timestamp;
1158         vcpu->hv_clock.flags = 0;
1159
1160         /*
1161          * The interface expects us to write an even number signaling that the
1162          * update is finished. Since the guest won't see the intermediate
1163          * state, we just increase by 2 at the end.
1164          */
1165         vcpu->hv_clock.version += 2;
1166
1167         shared_kaddr = kmap_atomic(vcpu->time_page, KM_USER0);
1168
1169         memcpy(shared_kaddr + vcpu->time_offset, &vcpu->hv_clock,
1170                sizeof(vcpu->hv_clock));
1171
1172         kunmap_atomic(shared_kaddr, KM_USER0);
1173
1174         mark_page_dirty(v->kvm, vcpu->time >> PAGE_SHIFT);
1175         return 0;
1176 }
1177
1178 static bool msr_mtrr_valid(unsigned msr)
1179 {
1180         switch (msr) {
1181         case 0x200 ... 0x200 + 2 * KVM_NR_VAR_MTRR - 1:
1182         case MSR_MTRRfix64K_00000:
1183         case MSR_MTRRfix16K_80000:
1184         case MSR_MTRRfix16K_A0000:
1185         case MSR_MTRRfix4K_C0000:
1186         case MSR_MTRRfix4K_C8000:
1187         case MSR_MTRRfix4K_D0000:
1188         case MSR_MTRRfix4K_D8000:
1189         case MSR_MTRRfix4K_E0000:
1190         case MSR_MTRRfix4K_E8000:
1191         case MSR_MTRRfix4K_F0000:
1192         case MSR_MTRRfix4K_F8000:
1193         case MSR_MTRRdefType:
1194         case MSR_IA32_CR_PAT:
1195                 return true;
1196         case 0x2f8:
1197                 return true;
1198         }
1199         return false;
1200 }
1201
1202 static bool valid_pat_type(unsigned t)
1203 {
1204         return t < 8 && (1 << t) & 0xf3; /* 0, 1, 4, 5, 6, 7 */
1205 }
1206
1207 static bool valid_mtrr_type(unsigned t)
1208 {
1209         return t < 8 && (1 << t) & 0x73; /* 0, 1, 4, 5, 6 */
1210 }
1211
1212 static bool mtrr_valid(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1213 {
1214         int i;
1215
1216         if (!msr_mtrr_valid(msr))
1217                 return false;
1218
1219         if (msr == MSR_IA32_CR_PAT) {
1220                 for (i = 0; i < 8; i++)
1221                         if (!valid_pat_type((data >> (i * 8)) & 0xff))
1222                                 return false;
1223                 return true;
1224         } else if (msr == MSR_MTRRdefType) {
1225                 if (data & ~0xcff)
1226                         return false;
1227                 return valid_mtrr_type(data & 0xff);
1228         } else if (msr >= MSR_MTRRfix64K_00000 && msr <= MSR_MTRRfix4K_F8000) {
1229                 for (i = 0; i < 8 ; i++)
1230                         if (!valid_mtrr_type((data >> (i * 8)) & 0xff))
1231                                 return false;
1232                 return true;
1233         }
1234
1235         /* variable MTRRs */
1236         return valid_mtrr_type(data & 0xff);
1237 }
1238
1239 static int set_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1240 {
1241         u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges;
1242
1243         if (!mtrr_valid(vcpu, msr, data))
1244                 return 1;
1245
1246         if (msr == MSR_MTRRdefType) {
1247                 vcpu->arch.mtrr_state.def_type = data;
1248                 vcpu->arch.mtrr_state.enabled = (data & 0xc00) >> 10;
1249         } else if (msr == MSR_MTRRfix64K_00000)
1250                 p[0] = data;
1251         else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000)
1252                 p[1 + msr - MSR_MTRRfix16K_80000] = data;
1253         else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000)
1254                 p[3 + msr - MSR_MTRRfix4K_C0000] = data;
1255         else if (msr == MSR_IA32_CR_PAT)
1256                 vcpu->arch.pat = data;
1257         else {  /* Variable MTRRs */
1258                 int idx, is_mtrr_mask;
1259                 u64 *pt;
1260
1261                 idx = (msr - 0x200) / 2;
1262                 is_mtrr_mask = msr - 0x200 - 2 * idx;
1263                 if (!is_mtrr_mask)
1264                         pt =
1265                           (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo;
1266                 else
1267                         pt =
1268                           (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo;
1269                 *pt = data;
1270         }
1271
1272         kvm_mmu_reset_context(vcpu);
1273         return 0;
1274 }
1275
1276 static int set_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1277 {
1278         u64 mcg_cap = vcpu->arch.mcg_cap;
1279         unsigned bank_num = mcg_cap & 0xff;
1280
1281         switch (msr) {
1282         case MSR_IA32_MCG_STATUS:
1283                 vcpu->arch.mcg_status = data;
1284                 break;
1285         case MSR_IA32_MCG_CTL:
1286                 if (!(mcg_cap & MCG_CTL_P))
1287                         return 1;
1288                 if (data != 0 && data != ~(u64)0)
1289                         return -1;
1290                 vcpu->arch.mcg_ctl = data;
1291                 break;
1292         default:
1293                 if (msr >= MSR_IA32_MC0_CTL &&
1294                     msr < MSR_IA32_MC0_CTL + 4 * bank_num) {
1295                         u32 offset = msr - MSR_IA32_MC0_CTL;
1296                         /* only 0 or all 1s can be written to IA32_MCi_CTL
1297                          * some Linux kernels though clear bit 10 in bank 4 to
1298                          * workaround a BIOS/GART TBL issue on AMD K8s, ignore
1299                          * this to avoid an uncatched #GP in the guest
1300                          */
1301                         if ((offset & 0x3) == 0 &&
1302                             data != 0 && (data | (1 << 10)) != ~(u64)0)
1303                                 return -1;
1304                         vcpu->arch.mce_banks[offset] = data;
1305                         break;
1306                 }
1307                 return 1;
1308         }
1309         return 0;
1310 }
1311
1312 static int xen_hvm_config(struct kvm_vcpu *vcpu, u64 data)
1313 {
1314         struct kvm *kvm = vcpu->kvm;
1315         int lm = is_long_mode(vcpu);
1316         u8 *blob_addr = lm ? (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_64
1317                 : (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_32;
1318         u8 blob_size = lm ? kvm->arch.xen_hvm_config.blob_size_64
1319                 : kvm->arch.xen_hvm_config.blob_size_32;
1320         u32 page_num = data & ~PAGE_MASK;
1321         u64 page_addr = data & PAGE_MASK;
1322         u8 *page;
1323         int r;
1324
1325         r = -E2BIG;
1326         if (page_num >= blob_size)
1327                 goto out;
1328         r = -ENOMEM;
1329         page = kzalloc(PAGE_SIZE, GFP_KERNEL);
1330         if (!page)
1331                 goto out;
1332         r = -EFAULT;
1333         if (copy_from_user(page, blob_addr + (page_num * PAGE_SIZE), PAGE_SIZE))
1334                 goto out_free;
1335         if (kvm_write_guest(kvm, page_addr, page, PAGE_SIZE))
1336                 goto out_free;
1337         r = 0;
1338 out_free:
1339         kfree(page);
1340 out:
1341         return r;
1342 }
1343
1344 static bool kvm_hv_hypercall_enabled(struct kvm *kvm)
1345 {
1346         return kvm->arch.hv_hypercall & HV_X64_MSR_HYPERCALL_ENABLE;
1347 }
1348
1349 static bool kvm_hv_msr_partition_wide(u32 msr)
1350 {
1351         bool r = false;
1352         switch (msr) {
1353         case HV_X64_MSR_GUEST_OS_ID:
1354         case HV_X64_MSR_HYPERCALL:
1355                 r = true;
1356                 break;
1357         }
1358
1359         return r;
1360 }
1361
1362 static int set_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1363 {
1364         struct kvm *kvm = vcpu->kvm;
1365
1366         switch (msr) {
1367         case HV_X64_MSR_GUEST_OS_ID:
1368                 kvm->arch.hv_guest_os_id = data;
1369                 /* setting guest os id to zero disables hypercall page */
1370                 if (!kvm->arch.hv_guest_os_id)
1371                         kvm->arch.hv_hypercall &= ~HV_X64_MSR_HYPERCALL_ENABLE;
1372                 break;
1373         case HV_X64_MSR_HYPERCALL: {
1374                 u64 gfn;
1375                 unsigned long addr;
1376                 u8 instructions[4];
1377
1378                 /* if guest os id is not set hypercall should remain disabled */
1379                 if (!kvm->arch.hv_guest_os_id)
1380                         break;
1381                 if (!(data & HV_X64_MSR_HYPERCALL_ENABLE)) {
1382                         kvm->arch.hv_hypercall = data;
1383                         break;
1384                 }
1385                 gfn = data >> HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT;
1386                 addr = gfn_to_hva(kvm, gfn);
1387                 if (kvm_is_error_hva(addr))
1388                         return 1;
1389                 kvm_x86_ops->patch_hypercall(vcpu, instructions);
1390                 ((unsigned char *)instructions)[3] = 0xc3; /* ret */
1391                 if (__copy_to_user((void __user *)addr, instructions, 4))
1392                         return 1;
1393                 kvm->arch.hv_hypercall = data;
1394                 break;
1395         }
1396         default:
1397                 pr_unimpl(vcpu, "HYPER-V unimplemented wrmsr: 0x%x "
1398                           "data 0x%llx\n", msr, data);
1399                 return 1;
1400         }
1401         return 0;
1402 }
1403
1404 static int set_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1405 {
1406         switch (msr) {
1407         case HV_X64_MSR_APIC_ASSIST_PAGE: {
1408                 unsigned long addr;
1409
1410                 if (!(data & HV_X64_MSR_APIC_ASSIST_PAGE_ENABLE)) {
1411                         vcpu->arch.hv_vapic = data;
1412                         break;
1413                 }
1414                 addr = gfn_to_hva(vcpu->kvm, data >>
1415                                   HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT);
1416                 if (kvm_is_error_hva(addr))
1417                         return 1;
1418                 if (__clear_user((void __user *)addr, PAGE_SIZE))
1419                         return 1;
1420                 vcpu->arch.hv_vapic = data;
1421                 break;
1422         }
1423         case HV_X64_MSR_EOI:
1424                 return kvm_hv_vapic_msr_write(vcpu, APIC_EOI, data);
1425         case HV_X64_MSR_ICR:
1426                 return kvm_hv_vapic_msr_write(vcpu, APIC_ICR, data);
1427         case HV_X64_MSR_TPR:
1428                 return kvm_hv_vapic_msr_write(vcpu, APIC_TASKPRI, data);
1429         default:
1430                 pr_unimpl(vcpu, "HYPER-V unimplemented wrmsr: 0x%x "
1431                           "data 0x%llx\n", msr, data);
1432                 return 1;
1433         }
1434
1435         return 0;
1436 }
1437
1438 static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data)
1439 {
1440         gpa_t gpa = data & ~0x3f;
1441
1442         /* Bits 2:5 are resrved, Should be zero */
1443         if (data & 0x3c)
1444                 return 1;
1445
1446         vcpu->arch.apf.msr_val = data;
1447
1448         if (!(data & KVM_ASYNC_PF_ENABLED)) {
1449                 kvm_clear_async_pf_completion_queue(vcpu);
1450                 kvm_async_pf_hash_reset(vcpu);
1451                 return 0;
1452         }
1453
1454         if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.apf.data, gpa))
1455                 return 1;
1456
1457         vcpu->arch.apf.send_user_only = !(data & KVM_ASYNC_PF_SEND_ALWAYS);
1458         kvm_async_pf_wakeup_all(vcpu);
1459         return 0;
1460 }
1461
1462 static void kvmclock_reset(struct kvm_vcpu *vcpu)
1463 {
1464         if (vcpu->arch.time_page) {
1465                 kvm_release_page_dirty(vcpu->arch.time_page);
1466                 vcpu->arch.time_page = NULL;
1467         }
1468 }
1469
1470 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1471 {
1472         switch (msr) {
1473         case MSR_EFER:
1474                 return set_efer(vcpu, data);
1475         case MSR_K7_HWCR:
1476                 data &= ~(u64)0x40;     /* ignore flush filter disable */
1477                 data &= ~(u64)0x100;    /* ignore ignne emulation enable */
1478                 if (data != 0) {
1479                         pr_unimpl(vcpu, "unimplemented HWCR wrmsr: 0x%llx\n",
1480                                 data);
1481                         return 1;
1482                 }
1483                 break;
1484         case MSR_FAM10H_MMIO_CONF_BASE:
1485                 if (data != 0) {
1486                         pr_unimpl(vcpu, "unimplemented MMIO_CONF_BASE wrmsr: "
1487                                 "0x%llx\n", data);
1488                         return 1;
1489                 }
1490                 break;
1491         case MSR_AMD64_NB_CFG:
1492                 break;
1493         case MSR_IA32_DEBUGCTLMSR:
1494                 if (!data) {
1495                         /* We support the non-activated case already */
1496                         break;
1497                 } else if (data & ~(DEBUGCTLMSR_LBR | DEBUGCTLMSR_BTF)) {
1498                         /* Values other than LBR and BTF are vendor-specific,
1499                            thus reserved and should throw a #GP */
1500                         return 1;
1501                 }
1502                 pr_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n",
1503                         __func__, data);
1504                 break;
1505         case MSR_IA32_UCODE_REV:
1506         case MSR_IA32_UCODE_WRITE:
1507         case MSR_VM_HSAVE_PA:
1508         case MSR_AMD64_PATCH_LOADER:
1509                 break;
1510         case 0x200 ... 0x2ff:
1511                 return set_msr_mtrr(vcpu, msr, data);
1512         case MSR_IA32_APICBASE:
1513                 kvm_set_apic_base(vcpu, data);
1514                 break;
1515         case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff:
1516                 return kvm_x2apic_msr_write(vcpu, msr, data);
1517         case MSR_IA32_MISC_ENABLE:
1518                 vcpu->arch.ia32_misc_enable_msr = data;
1519                 break;
1520         case MSR_KVM_WALL_CLOCK_NEW:
1521         case MSR_KVM_WALL_CLOCK:
1522                 vcpu->kvm->arch.wall_clock = data;
1523                 kvm_write_wall_clock(vcpu->kvm, data);
1524                 break;
1525         case MSR_KVM_SYSTEM_TIME_NEW:
1526         case MSR_KVM_SYSTEM_TIME: {
1527                 kvmclock_reset(vcpu);
1528
1529                 vcpu->arch.time = data;
1530                 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
1531
1532                 /* we verify if the enable bit is set... */
1533                 if (!(data & 1))
1534                         break;
1535
1536                 /* ...but clean it before doing the actual write */
1537                 vcpu->arch.time_offset = data & ~(PAGE_MASK | 1);
1538
1539                 vcpu->arch.time_page =
1540                                 gfn_to_page(vcpu->kvm, data >> PAGE_SHIFT);
1541
1542                 if (is_error_page(vcpu->arch.time_page)) {
1543                         kvm_release_page_clean(vcpu->arch.time_page);
1544                         vcpu->arch.time_page = NULL;
1545                 }
1546                 break;
1547         }
1548         case MSR_KVM_ASYNC_PF_EN:
1549                 if (kvm_pv_enable_async_pf(vcpu, data))
1550                         return 1;
1551                 break;
1552         case MSR_IA32_MCG_CTL:
1553         case MSR_IA32_MCG_STATUS:
1554         case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1:
1555                 return set_msr_mce(vcpu, msr, data);
1556
1557         /* Performance counters are not protected by a CPUID bit,
1558          * so we should check all of them in the generic path for the sake of
1559          * cross vendor migration.
1560          * Writing a zero into the event select MSRs disables them,
1561          * which we perfectly emulate ;-). Any other value should be at least
1562          * reported, some guests depend on them.
1563          */
1564         case MSR_P6_EVNTSEL0:
1565         case MSR_P6_EVNTSEL1:
1566         case MSR_K7_EVNTSEL0:
1567         case MSR_K7_EVNTSEL1:
1568         case MSR_K7_EVNTSEL2:
1569         case MSR_K7_EVNTSEL3:
1570                 if (data != 0)
1571                         pr_unimpl(vcpu, "unimplemented perfctr wrmsr: "
1572                                 "0x%x data 0x%llx\n", msr, data);
1573                 break;
1574         /* at least RHEL 4 unconditionally writes to the perfctr registers,
1575          * so we ignore writes to make it happy.
1576          */
1577         case MSR_P6_PERFCTR0:
1578         case MSR_P6_PERFCTR1:
1579         case MSR_K7_PERFCTR0:
1580         case MSR_K7_PERFCTR1:
1581         case MSR_K7_PERFCTR2:
1582         case MSR_K7_PERFCTR3:
1583                 pr_unimpl(vcpu, "unimplemented perfctr wrmsr: "
1584                         "0x%x data 0x%llx\n", msr, data);
1585                 break;
1586         case MSR_K7_CLK_CTL:
1587                 /*
1588                  * Ignore all writes to this no longer documented MSR.
1589                  * Writes are only relevant for old K7 processors,
1590                  * all pre-dating SVM, but a recommended workaround from
1591                  * AMD for these chips. It is possible to speicify the
1592                  * affected processor models on the command line, hence
1593                  * the need to ignore the workaround.
1594                  */
1595                 break;
1596         case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
1597                 if (kvm_hv_msr_partition_wide(msr)) {
1598                         int r;
1599                         mutex_lock(&vcpu->kvm->lock);
1600                         r = set_msr_hyperv_pw(vcpu, msr, data);
1601                         mutex_unlock(&vcpu->kvm->lock);
1602                         return r;
1603                 } else
1604                         return set_msr_hyperv(vcpu, msr, data);
1605                 break;
1606         case MSR_IA32_BBL_CR_CTL3:
1607                 /* Drop writes to this legacy MSR -- see rdmsr
1608                  * counterpart for further detail.
1609                  */
1610                 pr_unimpl(vcpu, "ignored wrmsr: 0x%x data %llx\n", msr, data);
1611                 break;
1612         default:
1613                 if (msr && (msr == vcpu->kvm->arch.xen_hvm_config.msr))
1614                         return xen_hvm_config(vcpu, data);
1615                 if (!ignore_msrs) {
1616                         pr_unimpl(vcpu, "unhandled wrmsr: 0x%x data %llx\n",
1617                                 msr, data);
1618                         return 1;
1619                 } else {
1620                         pr_unimpl(vcpu, "ignored wrmsr: 0x%x data %llx\n",
1621                                 msr, data);
1622                         break;
1623                 }
1624         }
1625         return 0;
1626 }
1627 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1628
1629
1630 /*
1631  * Reads an msr value (of 'msr_index') into 'pdata'.
1632  * Returns 0 on success, non-0 otherwise.
1633  * Assumes vcpu_load() was already called.
1634  */
1635 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1636 {
1637         return kvm_x86_ops->get_msr(vcpu, msr_index, pdata);
1638 }
1639
1640 static int get_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1641 {
1642         u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges;
1643
1644         if (!msr_mtrr_valid(msr))
1645                 return 1;
1646
1647         if (msr == MSR_MTRRdefType)
1648                 *pdata = vcpu->arch.mtrr_state.def_type +
1649                          (vcpu->arch.mtrr_state.enabled << 10);
1650         else if (msr == MSR_MTRRfix64K_00000)
1651                 *pdata = p[0];
1652         else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000)
1653                 *pdata = p[1 + msr - MSR_MTRRfix16K_80000];
1654         else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000)
1655                 *pdata = p[3 + msr - MSR_MTRRfix4K_C0000];
1656         else if (msr == MSR_IA32_CR_PAT)
1657                 *pdata = vcpu->arch.pat;
1658         else {  /* Variable MTRRs */
1659                 int idx, is_mtrr_mask;
1660                 u64 *pt;
1661
1662                 idx = (msr - 0x200) / 2;
1663                 is_mtrr_mask = msr - 0x200 - 2 * idx;
1664                 if (!is_mtrr_mask)
1665                         pt =
1666                           (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo;
1667                 else
1668                         pt =
1669                           (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo;
1670                 *pdata = *pt;
1671         }
1672
1673         return 0;
1674 }
1675
1676 static int get_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1677 {
1678         u64 data;
1679         u64 mcg_cap = vcpu->arch.mcg_cap;
1680         unsigned bank_num = mcg_cap & 0xff;
1681
1682         switch (msr) {
1683         case MSR_IA32_P5_MC_ADDR:
1684         case MSR_IA32_P5_MC_TYPE:
1685                 data = 0;
1686                 break;
1687         case MSR_IA32_MCG_CAP:
1688                 data = vcpu->arch.mcg_cap;
1689                 break;
1690         case MSR_IA32_MCG_CTL:
1691                 if (!(mcg_cap & MCG_CTL_P))
1692                         return 1;
1693                 data = vcpu->arch.mcg_ctl;
1694                 break;
1695         case MSR_IA32_MCG_STATUS:
1696                 data = vcpu->arch.mcg_status;
1697                 break;
1698         default:
1699                 if (msr >= MSR_IA32_MC0_CTL &&
1700                     msr < MSR_IA32_MC0_CTL + 4 * bank_num) {
1701                         u32 offset = msr - MSR_IA32_MC0_CTL;
1702                         data = vcpu->arch.mce_banks[offset];
1703                         break;
1704                 }
1705                 return 1;
1706         }
1707         *pdata = data;
1708         return 0;
1709 }
1710
1711 static int get_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1712 {
1713         u64 data = 0;
1714         struct kvm *kvm = vcpu->kvm;
1715
1716         switch (msr) {
1717         case HV_X64_MSR_GUEST_OS_ID:
1718                 data = kvm->arch.hv_guest_os_id;
1719                 break;
1720         case HV_X64_MSR_HYPERCALL:
1721                 data = kvm->arch.hv_hypercall;
1722                 break;
1723         default:
1724                 pr_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1725                 return 1;
1726         }
1727
1728         *pdata = data;
1729         return 0;
1730 }
1731
1732 static int get_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1733 {
1734         u64 data = 0;
1735
1736         switch (msr) {
1737         case HV_X64_MSR_VP_INDEX: {
1738                 int r;
1739                 struct kvm_vcpu *v;
1740                 kvm_for_each_vcpu(r, v, vcpu->kvm)
1741                         if (v == vcpu)
1742                                 data = r;
1743                 break;
1744         }
1745         case HV_X64_MSR_EOI:
1746                 return kvm_hv_vapic_msr_read(vcpu, APIC_EOI, pdata);
1747         case HV_X64_MSR_ICR:
1748                 return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata);
1749         case HV_X64_MSR_TPR:
1750                 return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata);
1751         default:
1752                 pr_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1753                 return 1;
1754         }
1755         *pdata = data;
1756         return 0;
1757 }
1758
1759 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1760 {
1761         u64 data;
1762
1763         switch (msr) {
1764         case MSR_IA32_PLATFORM_ID:
1765         case MSR_IA32_UCODE_REV:
1766         case MSR_IA32_EBL_CR_POWERON:
1767         case MSR_IA32_DEBUGCTLMSR:
1768         case MSR_IA32_LASTBRANCHFROMIP:
1769         case MSR_IA32_LASTBRANCHTOIP:
1770         case MSR_IA32_LASTINTFROMIP:
1771         case MSR_IA32_LASTINTTOIP:
1772         case MSR_K8_SYSCFG:
1773         case MSR_K7_HWCR:
1774         case MSR_VM_HSAVE_PA:
1775         case MSR_P6_PERFCTR0:
1776         case MSR_P6_PERFCTR1:
1777         case MSR_P6_EVNTSEL0:
1778         case MSR_P6_EVNTSEL1:
1779         case MSR_K7_EVNTSEL0:
1780         case MSR_K7_PERFCTR0:
1781         case MSR_K8_INT_PENDING_MSG:
1782         case MSR_AMD64_NB_CFG:
1783         case MSR_FAM10H_MMIO_CONF_BASE:
1784                 data = 0;
1785                 break;
1786         case MSR_MTRRcap:
1787                 data = 0x500 | KVM_NR_VAR_MTRR;
1788                 break;
1789         case 0x200 ... 0x2ff:
1790                 return get_msr_mtrr(vcpu, msr, pdata);
1791         case 0xcd: /* fsb frequency */
1792                 data = 3;
1793                 break;
1794                 /*
1795                  * MSR_EBC_FREQUENCY_ID
1796                  * Conservative value valid for even the basic CPU models.
1797                  * Models 0,1: 000 in bits 23:21 indicating a bus speed of
1798                  * 100MHz, model 2 000 in bits 18:16 indicating 100MHz,
1799                  * and 266MHz for model 3, or 4. Set Core Clock
1800                  * Frequency to System Bus Frequency Ratio to 1 (bits
1801                  * 31:24) even though these are only valid for CPU
1802                  * models > 2, however guests may end up dividing or
1803                  * multiplying by zero otherwise.
1804                  */
1805         case MSR_EBC_FREQUENCY_ID:
1806                 data = 1 << 24;
1807                 break;
1808         case MSR_IA32_APICBASE:
1809                 data = kvm_get_apic_base(vcpu);
1810                 break;
1811         case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff:
1812                 return kvm_x2apic_msr_read(vcpu, msr, pdata);
1813                 break;
1814         case MSR_IA32_MISC_ENABLE:
1815                 data = vcpu->arch.ia32_misc_enable_msr;
1816                 break;
1817         case MSR_IA32_PERF_STATUS:
1818                 /* TSC increment by tick */
1819                 data = 1000ULL;
1820                 /* CPU multiplier */
1821                 data |= (((uint64_t)4ULL) << 40);
1822                 break;
1823         case MSR_EFER:
1824                 data = vcpu->arch.efer;
1825                 break;
1826         case MSR_KVM_WALL_CLOCK:
1827         case MSR_KVM_WALL_CLOCK_NEW:
1828                 data = vcpu->kvm->arch.wall_clock;
1829                 break;
1830         case MSR_KVM_SYSTEM_TIME:
1831         case MSR_KVM_SYSTEM_TIME_NEW:
1832                 data = vcpu->arch.time;
1833                 break;
1834         case MSR_KVM_ASYNC_PF_EN:
1835                 data = vcpu->arch.apf.msr_val;
1836                 break;
1837         case MSR_IA32_P5_MC_ADDR:
1838         case MSR_IA32_P5_MC_TYPE:
1839         case MSR_IA32_MCG_CAP:
1840         case MSR_IA32_MCG_CTL:
1841         case MSR_IA32_MCG_STATUS:
1842         case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1:
1843                 return get_msr_mce(vcpu, msr, pdata);
1844         case MSR_K7_CLK_CTL:
1845                 /*
1846                  * Provide expected ramp-up count for K7. All other
1847                  * are set to zero, indicating minimum divisors for
1848                  * every field.
1849                  *
1850                  * This prevents guest kernels on AMD host with CPU
1851                  * type 6, model 8 and higher from exploding due to
1852                  * the rdmsr failing.
1853                  */
1854                 data = 0x20000000;
1855                 break;
1856         case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
1857                 if (kvm_hv_msr_partition_wide(msr)) {
1858                         int r;
1859                         mutex_lock(&vcpu->kvm->lock);
1860                         r = get_msr_hyperv_pw(vcpu, msr, pdata);
1861                         mutex_unlock(&vcpu->kvm->lock);
1862                         return r;
1863                 } else
1864                         return get_msr_hyperv(vcpu, msr, pdata);
1865                 break;
1866         case MSR_IA32_BBL_CR_CTL3:
1867                 /* This legacy MSR exists but isn't fully documented in current
1868                  * silicon.  It is however accessed by winxp in very narrow
1869                  * scenarios where it sets bit #19, itself documented as
1870                  * a "reserved" bit.  Best effort attempt to source coherent
1871                  * read data here should the balance of the register be
1872                  * interpreted by the guest:
1873                  *
1874                  * L2 cache control register 3: 64GB range, 256KB size,
1875                  * enabled, latency 0x1, configured
1876                  */
1877                 data = 0xbe702111;
1878                 break;
1879         default:
1880                 if (!ignore_msrs) {
1881                         pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
1882                         return 1;
1883                 } else {
1884                         pr_unimpl(vcpu, "ignored rdmsr: 0x%x\n", msr);
1885                         data = 0;
1886                 }
1887                 break;
1888         }
1889         *pdata = data;
1890         return 0;
1891 }
1892 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1893
1894 /*
1895  * Read or write a bunch of msrs. All parameters are kernel addresses.
1896  *
1897  * @return number of msrs set successfully.
1898  */
1899 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
1900                     struct kvm_msr_entry *entries,
1901                     int (*do_msr)(struct kvm_vcpu *vcpu,
1902                                   unsigned index, u64 *data))
1903 {
1904         int i, idx;
1905
1906         idx = srcu_read_lock(&vcpu->kvm->srcu);
1907         for (i = 0; i < msrs->nmsrs; ++i)
1908                 if (do_msr(vcpu, entries[i].index, &entries[i].data))
1909                         break;
1910         srcu_read_unlock(&vcpu->kvm->srcu, idx);
1911
1912         return i;
1913 }
1914
1915 /*
1916  * Read or write a bunch of msrs. Parameters are user addresses.
1917  *
1918  * @return number of msrs set successfully.
1919  */
1920 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
1921                   int (*do_msr)(struct kvm_vcpu *vcpu,
1922                                 unsigned index, u64 *data),
1923                   int writeback)
1924 {
1925         struct kvm_msrs msrs;
1926         struct kvm_msr_entry *entries;
1927         int r, n;
1928         unsigned size;
1929
1930         r = -EFAULT;
1931         if (copy_from_user(&msrs, user_msrs, sizeof msrs))
1932                 goto out;
1933
1934         r = -E2BIG;
1935         if (msrs.nmsrs >= MAX_IO_MSRS)
1936                 goto out;
1937
1938         r = -ENOMEM;
1939         size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
1940         entries = kmalloc(size, GFP_KERNEL);
1941         if (!entries)
1942                 goto out;
1943
1944         r = -EFAULT;
1945         if (copy_from_user(entries, user_msrs->entries, size))
1946                 goto out_free;
1947
1948         r = n = __msr_io(vcpu, &msrs, entries, do_msr);
1949         if (r < 0)
1950                 goto out_free;
1951
1952         r = -EFAULT;
1953         if (writeback && copy_to_user(user_msrs->entries, entries, size))
1954                 goto out_free;
1955
1956         r = n;
1957
1958 out_free:
1959         kfree(entries);
1960 out:
1961         return r;
1962 }
1963
1964 int kvm_dev_ioctl_check_extension(long ext)
1965 {
1966         int r;
1967
1968         switch (ext) {
1969         case KVM_CAP_IRQCHIP:
1970         case KVM_CAP_HLT:
1971         case KVM_CAP_MMU_SHADOW_CACHE_CONTROL:
1972         case KVM_CAP_SET_TSS_ADDR:
1973         case KVM_CAP_EXT_CPUID:
1974         case KVM_CAP_CLOCKSOURCE:
1975         case KVM_CAP_PIT:
1976         case KVM_CAP_NOP_IO_DELAY:
1977         case KVM_CAP_MP_STATE:
1978         case KVM_CAP_SYNC_MMU:
1979         case KVM_CAP_USER_NMI:
1980         case KVM_CAP_REINJECT_CONTROL:
1981         case KVM_CAP_IRQ_INJECT_STATUS:
1982         case KVM_CAP_ASSIGN_DEV_IRQ:
1983         case KVM_CAP_IRQFD:
1984         case KVM_CAP_IOEVENTFD:
1985         case KVM_CAP_PIT2:
1986         case KVM_CAP_PIT_STATE2:
1987         case KVM_CAP_SET_IDENTITY_MAP_ADDR:
1988         case KVM_CAP_XEN_HVM:
1989         case KVM_CAP_ADJUST_CLOCK:
1990         case KVM_CAP_VCPU_EVENTS:
1991         case KVM_CAP_HYPERV:
1992         case KVM_CAP_HYPERV_VAPIC:
1993         case KVM_CAP_HYPERV_SPIN:
1994         case KVM_CAP_PCI_SEGMENT:
1995         case KVM_CAP_DEBUGREGS:
1996         case KVM_CAP_X86_ROBUST_SINGLESTEP:
1997         case KVM_CAP_XSAVE:
1998         case KVM_CAP_ASYNC_PF:
1999         case KVM_CAP_GET_TSC_KHZ:
2000                 r = 1;
2001                 break;
2002         case KVM_CAP_COALESCED_MMIO:
2003                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
2004                 break;
2005         case KVM_CAP_VAPIC:
2006                 r = !kvm_x86_ops->cpu_has_accelerated_tpr();
2007                 break;
2008         case KVM_CAP_NR_VCPUS:
2009                 r = KVM_MAX_VCPUS;
2010                 break;
2011         case KVM_CAP_NR_MEMSLOTS:
2012                 r = KVM_MEMORY_SLOTS;
2013                 break;
2014         case KVM_CAP_PV_MMU:    /* obsolete */
2015                 r = 0;
2016                 break;
2017         case KVM_CAP_IOMMU:
2018                 r = iommu_found();
2019                 break;
2020         case KVM_CAP_MCE:
2021                 r = KVM_MAX_MCE_BANKS;
2022                 break;
2023         case KVM_CAP_XCRS:
2024                 r = cpu_has_xsave;
2025                 break;
2026         case KVM_CAP_TSC_CONTROL:
2027                 r = kvm_has_tsc_control;
2028                 break;
2029         default:
2030                 r = 0;
2031                 break;
2032         }
2033         return r;
2034
2035 }
2036
2037 long kvm_arch_dev_ioctl(struct file *filp,
2038                         unsigned int ioctl, unsigned long arg)
2039 {
2040         void __user *argp = (void __user *)arg;
2041         long r;
2042
2043         switch (ioctl) {
2044         case KVM_GET_MSR_INDEX_LIST: {
2045                 struct kvm_msr_list __user *user_msr_list = argp;
2046                 struct kvm_msr_list msr_list;
2047                 unsigned n;
2048
2049                 r = -EFAULT;
2050                 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
2051                         goto out;
2052                 n = msr_list.nmsrs;
2053                 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
2054                 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
2055                         goto out;
2056                 r = -E2BIG;
2057                 if (n < msr_list.nmsrs)
2058                         goto out;
2059                 r = -EFAULT;
2060                 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
2061                                  num_msrs_to_save * sizeof(u32)))
2062                         goto out;
2063                 if (copy_to_user(user_msr_list->indices + num_msrs_to_save,
2064                                  &emulated_msrs,
2065                                  ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
2066                         goto out;
2067                 r = 0;
2068                 break;
2069         }
2070         case KVM_GET_SUPPORTED_CPUID: {
2071                 struct kvm_cpuid2 __user *cpuid_arg = argp;
2072                 struct kvm_cpuid2 cpuid;
2073
2074                 r = -EFAULT;
2075                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2076                         goto out;
2077                 r = kvm_dev_ioctl_get_supported_cpuid(&cpuid,
2078                                                       cpuid_arg->entries);
2079                 if (r)
2080                         goto out;
2081
2082                 r = -EFAULT;
2083                 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
2084                         goto out;
2085                 r = 0;
2086                 break;
2087         }
2088         case KVM_X86_GET_MCE_CAP_SUPPORTED: {
2089                 u64 mce_cap;
2090
2091                 mce_cap = KVM_MCE_CAP_SUPPORTED;
2092                 r = -EFAULT;
2093                 if (copy_to_user(argp, &mce_cap, sizeof mce_cap))
2094                         goto out;
2095                 r = 0;
2096                 break;
2097         }
2098         default:
2099                 r = -EINVAL;
2100         }
2101 out:
2102         return r;
2103 }
2104
2105 static void wbinvd_ipi(void *garbage)
2106 {
2107         wbinvd();
2108 }
2109
2110 static bool need_emulate_wbinvd(struct kvm_vcpu *vcpu)
2111 {
2112         return vcpu->kvm->arch.iommu_domain &&
2113                 !(vcpu->kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY);
2114 }
2115
2116 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
2117 {
2118         /* Address WBINVD may be executed by guest */
2119         if (need_emulate_wbinvd(vcpu)) {
2120                 if (kvm_x86_ops->has_wbinvd_exit())
2121                         cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask);
2122                 else if (vcpu->cpu != -1 && vcpu->cpu != cpu)
2123                         smp_call_function_single(vcpu->cpu,
2124                                         wbinvd_ipi, NULL, 1);
2125         }
2126
2127         kvm_x86_ops->vcpu_load(vcpu, cpu);
2128         if (unlikely(vcpu->cpu != cpu) || check_tsc_unstable()) {
2129                 /* Make sure TSC doesn't go backwards */
2130                 s64 tsc_delta;
2131                 u64 tsc;
2132
2133                 kvm_get_msr(vcpu, MSR_IA32_TSC, &tsc);
2134                 tsc_delta = !vcpu->arch.last_guest_tsc ? 0 :
2135                              tsc - vcpu->arch.last_guest_tsc;
2136
2137                 if (tsc_delta < 0)
2138                         mark_tsc_unstable("KVM discovered backwards TSC");
2139                 if (check_tsc_unstable()) {
2140                         kvm_x86_ops->adjust_tsc_offset(vcpu, -tsc_delta);
2141                         vcpu->arch.tsc_catchup = 1;
2142                 }
2143                 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
2144                 if (vcpu->cpu != cpu)
2145                         kvm_migrate_timers(vcpu);
2146                 vcpu->cpu = cpu;
2147         }
2148 }
2149
2150 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
2151 {
2152         kvm_x86_ops->vcpu_put(vcpu);
2153         kvm_put_guest_fpu(vcpu);
2154         kvm_get_msr(vcpu, MSR_IA32_TSC, &vcpu->arch.last_guest_tsc);
2155 }
2156
2157 static int is_efer_nx(void)
2158 {
2159         unsigned long long efer = 0;
2160
2161         rdmsrl_safe(MSR_EFER, &efer);
2162         return efer & EFER_NX;
2163 }
2164
2165 static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
2166 {
2167         int i;
2168         struct kvm_cpuid_entry2 *e, *entry;
2169
2170         entry = NULL;
2171         for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
2172                 e = &vcpu->arch.cpuid_entries[i];
2173                 if (e->function == 0x80000001) {
2174                         entry = e;
2175                         break;
2176                 }
2177         }
2178         if (entry && (entry->edx & (1 << 20)) && !is_efer_nx()) {
2179                 entry->edx &= ~(1 << 20);
2180                 printk(KERN_INFO "kvm: guest NX capability removed\n");
2181         }
2182 }
2183
2184 /* when an old userspace process fills a new kernel module */
2185 static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
2186                                     struct kvm_cpuid *cpuid,
2187                                     struct kvm_cpuid_entry __user *entries)
2188 {
2189         int r, i;
2190         struct kvm_cpuid_entry *cpuid_entries;
2191
2192         r = -E2BIG;
2193         if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
2194                 goto out;
2195         r = -ENOMEM;
2196         cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry) * cpuid->nent);
2197         if (!cpuid_entries)
2198                 goto out;
2199         r = -EFAULT;
2200         if (copy_from_user(cpuid_entries, entries,
2201                            cpuid->nent * sizeof(struct kvm_cpuid_entry)))
2202                 goto out_free;
2203         for (i = 0; i < cpuid->nent; i++) {
2204                 vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function;
2205                 vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax;
2206                 vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx;
2207                 vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx;
2208                 vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx;
2209                 vcpu->arch.cpuid_entries[i].index = 0;
2210                 vcpu->arch.cpuid_entries[i].flags = 0;
2211                 vcpu->arch.cpuid_entries[i].padding[0] = 0;
2212                 vcpu->arch.cpuid_entries[i].padding[1] = 0;
2213                 vcpu->arch.cpuid_entries[i].padding[2] = 0;
2214         }
2215         vcpu->arch.cpuid_nent = cpuid->nent;
2216         cpuid_fix_nx_cap(vcpu);
2217         r = 0;
2218         kvm_apic_set_version(vcpu);
2219         kvm_x86_ops->cpuid_update(vcpu);
2220         update_cpuid(vcpu);
2221
2222 out_free:
2223         vfree(cpuid_entries);
2224 out:
2225         return r;
2226 }
2227
2228 static int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
2229                                      struct kvm_cpuid2 *cpuid,
2230                                      struct kvm_cpuid_entry2 __user *entries)
2231 {
2232         int r;
2233
2234         r = -E2BIG;
2235         if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
2236                 goto out;
2237         r = -EFAULT;
2238         if (copy_from_user(&vcpu->arch.cpuid_entries, entries,
2239                            cpuid->nent * sizeof(struct kvm_cpuid_entry2)))
2240                 goto out;
2241         vcpu->arch.cpuid_nent = cpuid->nent;
2242         kvm_apic_set_version(vcpu);
2243         kvm_x86_ops->cpuid_update(vcpu);
2244         update_cpuid(vcpu);
2245         return 0;
2246
2247 out:
2248         return r;
2249 }
2250
2251 static int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
2252                                      struct kvm_cpuid2 *cpuid,
2253                                      struct kvm_cpuid_entry2 __user *entries)
2254 {
2255         int r;
2256
2257         r = -E2BIG;
2258         if (cpuid->nent < vcpu->arch.cpuid_nent)
2259                 goto out;
2260         r = -EFAULT;
2261         if (copy_to_user(entries, &vcpu->arch.cpuid_entries,
2262                          vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2)))
2263                 goto out;
2264         return 0;
2265
2266 out:
2267         cpuid->nent = vcpu->arch.cpuid_nent;
2268         return r;
2269 }
2270
2271 static void cpuid_mask(u32 *word, int wordnum)
2272 {
2273         *word &= boot_cpu_data.x86_capability[wordnum];
2274 }
2275
2276 static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function,
2277                            u32 index)
2278 {
2279         entry->function = function;
2280         entry->index = index;
2281         cpuid_count(entry->function, entry->index,
2282                     &entry->eax, &entry->ebx, &entry->ecx, &entry->edx);
2283         entry->flags = 0;
2284 }
2285
2286 static bool supported_xcr0_bit(unsigned bit)
2287 {
2288         u64 mask = ((u64)1 << bit);
2289
2290         return mask & (XSTATE_FP | XSTATE_SSE | XSTATE_YMM) & host_xcr0;
2291 }
2292
2293 #define F(x) bit(X86_FEATURE_##x)
2294
2295 static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
2296                          u32 index, int *nent, int maxnent)
2297 {
2298         unsigned f_nx = is_efer_nx() ? F(NX) : 0;
2299 #ifdef CONFIG_X86_64
2300         unsigned f_gbpages = (kvm_x86_ops->get_lpage_level() == PT_PDPE_LEVEL)
2301                                 ? F(GBPAGES) : 0;
2302         unsigned f_lm = F(LM);
2303 #else
2304         unsigned f_gbpages = 0;
2305         unsigned f_lm = 0;
2306 #endif
2307         unsigned f_rdtscp = kvm_x86_ops->rdtscp_supported() ? F(RDTSCP) : 0;
2308
2309         /* cpuid 1.edx */
2310         const u32 kvm_supported_word0_x86_features =
2311                 F(FPU) | F(VME) | F(DE) | F(PSE) |
2312                 F(TSC) | F(MSR) | F(PAE) | F(MCE) |
2313                 F(CX8) | F(APIC) | 0 /* Reserved */ | F(SEP) |
2314                 F(MTRR) | F(PGE) | F(MCA) | F(CMOV) |
2315                 F(PAT) | F(PSE36) | 0 /* PSN */ | F(CLFLSH) |
2316                 0 /* Reserved, DS, ACPI */ | F(MMX) |
2317                 F(FXSR) | F(XMM) | F(XMM2) | F(SELFSNOOP) |
2318                 0 /* HTT, TM, Reserved, PBE */;
2319         /* cpuid 0x80000001.edx */
2320         const u32 kvm_supported_word1_x86_features =
2321                 F(FPU) | F(VME) | F(DE) | F(PSE) |
2322                 F(TSC) | F(MSR) | F(PAE) | F(MCE) |
2323                 F(CX8) | F(APIC) | 0 /* Reserved */ | F(SYSCALL) |
2324                 F(MTRR) | F(PGE) | F(MCA) | F(CMOV) |
2325                 F(PAT) | F(PSE36) | 0 /* Reserved */ |
2326                 f_nx | 0 /* Reserved */ | F(MMXEXT) | F(MMX) |
2327                 F(FXSR) | F(FXSR_OPT) | f_gbpages | f_rdtscp |
2328                 0 /* Reserved */ | f_lm | F(3DNOWEXT) | F(3DNOW);
2329         /* cpuid 1.ecx */
2330         const u32 kvm_supported_word4_x86_features =
2331                 F(XMM3) | F(PCLMULQDQ) | 0 /* DTES64, MONITOR */ |
2332                 0 /* DS-CPL, VMX, SMX, EST */ |
2333                 0 /* TM2 */ | F(SSSE3) | 0 /* CNXT-ID */ | 0 /* Reserved */ |
2334                 0 /* Reserved */ | F(CX16) | 0 /* xTPR Update, PDCM */ |
2335                 0 /* Reserved, DCA */ | F(XMM4_1) |
2336                 F(XMM4_2) | F(X2APIC) | F(MOVBE) | F(POPCNT) |
2337                 0 /* Reserved*/ | F(AES) | F(XSAVE) | 0 /* OSXSAVE */ | F(AVX) |
2338                 F(F16C);
2339         /* cpuid 0x80000001.ecx */
2340         const u32 kvm_supported_word6_x86_features =
2341                 F(LAHF_LM) | F(CMP_LEGACY) | 0 /*SVM*/ | 0 /* ExtApicSpace */ |
2342                 F(CR8_LEGACY) | F(ABM) | F(SSE4A) | F(MISALIGNSSE) |
2343                 F(3DNOWPREFETCH) | 0 /* OSVW */ | 0 /* IBS */ | F(XOP) |
2344                 0 /* SKINIT, WDT, LWP */ | F(FMA4) | F(TBM);
2345
2346         /* cpuid 0xC0000001.edx */
2347         const u32 kvm_supported_word5_x86_features =
2348                 F(XSTORE) | F(XSTORE_EN) | F(XCRYPT) | F(XCRYPT_EN) |
2349                 F(ACE2) | F(ACE2_EN) | F(PHE) | F(PHE_EN) |
2350                 F(PMM) | F(PMM_EN);
2351
2352         /* all calls to cpuid_count() should be made on the same cpu */
2353         get_cpu();
2354         do_cpuid_1_ent(entry, function, index);
2355         ++*nent;
2356
2357         switch (function) {
2358         case 0:
2359                 entry->eax = min(entry->eax, (u32)0xd);
2360                 break;
2361         case 1:
2362                 entry->edx &= kvm_supported_word0_x86_features;
2363                 cpuid_mask(&entry->edx, 0);
2364                 entry->ecx &= kvm_supported_word4_x86_features;
2365                 cpuid_mask(&entry->ecx, 4);
2366                 /* we support x2apic emulation even if host does not support
2367                  * it since we emulate x2apic in software */
2368                 entry->ecx |= F(X2APIC);
2369                 break;
2370         /* function 2 entries are STATEFUL. That is, repeated cpuid commands
2371          * may return different values. This forces us to get_cpu() before
2372          * issuing the first command, and also to emulate this annoying behavior
2373          * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */
2374         case 2: {
2375                 int t, times = entry->eax & 0xff;
2376
2377                 entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
2378                 entry->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
2379                 for (t = 1; t < times && *nent < maxnent; ++t) {
2380                         do_cpuid_1_ent(&entry[t], function, 0);
2381                         entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
2382                         ++*nent;
2383                 }
2384                 break;
2385         }
2386         /* function 4 and 0xb have additional index. */
2387         case 4: {
2388                 int i, cache_type;
2389
2390                 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
2391                 /* read more entries until cache_type is zero */
2392                 for (i = 1; *nent < maxnent; ++i) {
2393                         cache_type = entry[i - 1].eax & 0x1f;
2394                         if (!cache_type)
2395                                 break;
2396                         do_cpuid_1_ent(&entry[i], function, i);
2397                         entry[i].flags |=
2398                                KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
2399                         ++*nent;
2400                 }
2401                 break;
2402         }
2403         case 9:
2404                 break;
2405         case 0xb: {
2406                 int i, level_type;
2407
2408                 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
2409                 /* read more entries until level_type is zero */
2410                 for (i = 1; *nent < maxnent; ++i) {
2411                         level_type = entry[i - 1].ecx & 0xff00;
2412                         if (!level_type)
2413                                 break;
2414                         do_cpuid_1_ent(&entry[i], function, i);
2415                         entry[i].flags |=
2416                                KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
2417                         ++*nent;
2418                 }
2419                 break;
2420         }
2421         case 0xd: {
2422                 int i;
2423
2424                 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
2425                 for (i = 1; *nent < maxnent && i < 64; ++i) {
2426                         if (entry[i].eax == 0 || !supported_xcr0_bit(i))
2427                                 continue;
2428                         do_cpuid_1_ent(&entry[i], function, i);
2429                         entry[i].flags |=
2430                                KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
2431                         ++*nent;
2432                 }
2433                 break;
2434         }
2435         case KVM_CPUID_SIGNATURE: {
2436                 char signature[12] = "KVMKVMKVM\0\0";
2437                 u32 *sigptr = (u32 *)signature;
2438                 entry->eax = 0;
2439                 entry->ebx = sigptr[0];
2440                 entry->ecx = sigptr[1];
2441                 entry->edx = sigptr[2];
2442                 break;
2443         }
2444         case KVM_CPUID_FEATURES:
2445                 entry->eax = (1 << KVM_FEATURE_CLOCKSOURCE) |
2446                              (1 << KVM_FEATURE_NOP_IO_DELAY) |
2447                              (1 << KVM_FEATURE_CLOCKSOURCE2) |
2448                              (1 << KVM_FEATURE_ASYNC_PF) |
2449                              (1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT);
2450                 entry->ebx = 0;
2451                 entry->ecx = 0;
2452                 entry->edx = 0;
2453                 break;
2454         case 0x80000000:
2455                 entry->eax = min(entry->eax, 0x8000001a);
2456                 break;
2457         case 0x80000001:
2458                 entry->edx &= kvm_supported_word1_x86_features;
2459                 cpuid_mask(&entry->edx, 1);
2460                 entry->ecx &= kvm_supported_word6_x86_features;
2461                 cpuid_mask(&entry->ecx, 6);
2462                 break;
2463         case 0x80000008: {
2464                 unsigned g_phys_as = (entry->eax >> 16) & 0xff;
2465                 unsigned virt_as = max((entry->eax >> 8) & 0xff, 48U);
2466                 unsigned phys_as = entry->eax & 0xff;
2467
2468                 if (!g_phys_as)
2469                         g_phys_as = phys_as;
2470                 entry->eax = g_phys_as | (virt_as << 8);
2471                 entry->ebx = entry->edx = 0;
2472                 break;
2473         }
2474         case 0x80000019:
2475                 entry->ecx = entry->edx = 0;
2476                 break;
2477         case 0x8000001a:
2478                 break;
2479         case 0x8000001d:
2480                 break;
2481         /*Add support for Centaur's CPUID instruction*/
2482         case 0xC0000000:
2483                 /*Just support up to 0xC0000004 now*/
2484                 entry->eax = min(entry->eax, 0xC0000004);
2485                 break;
2486         case 0xC0000001:
2487                 entry->edx &= kvm_supported_word5_x86_features;
2488                 cpuid_mask(&entry->edx, 5);
2489                 break;
2490         case 3: /* Processor serial number */
2491         case 5: /* MONITOR/MWAIT */
2492         case 6: /* Thermal management */
2493         case 0xA: /* Architectural Performance Monitoring */
2494         case 0x80000007: /* Advanced power management */
2495         case 0xC0000002:
2496         case 0xC0000003:
2497         case 0xC0000004:
2498         default:
2499                 entry->eax = entry->ebx = entry->ecx = entry->edx = 0;
2500                 break;
2501         }
2502
2503         kvm_x86_ops->set_supported_cpuid(function, entry);
2504
2505         put_cpu();
2506 }
2507
2508 #undef F
2509
2510 static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
2511                                      struct kvm_cpuid_entry2 __user *entries)
2512 {
2513         struct kvm_cpuid_entry2 *cpuid_entries;
2514         int limit, nent = 0, r = -E2BIG;
2515         u32 func;
2516
2517         if (cpuid->nent < 1)
2518                 goto out;
2519         if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
2520                 cpuid->nent = KVM_MAX_CPUID_ENTRIES;
2521         r = -ENOMEM;
2522         cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent);
2523         if (!cpuid_entries)
2524                 goto out;
2525
2526         do_cpuid_ent(&cpuid_entries[0], 0, 0, &nent, cpuid->nent);
2527         limit = cpuid_entries[0].eax;
2528         for (func = 1; func <= limit && nent < cpuid->nent; ++func)
2529                 do_cpuid_ent(&cpuid_entries[nent], func, 0,
2530                              &nent, cpuid->nent);
2531         r = -E2BIG;
2532         if (nent >= cpuid->nent)
2533                 goto out_free;
2534
2535         do_cpuid_ent(&cpuid_entries[nent], 0x80000000, 0, &nent, cpuid->nent);
2536         limit = cpuid_entries[nent - 1].eax;
2537         for (func = 0x80000001; func <= limit && nent < cpuid->nent; ++func)
2538                 do_cpuid_ent(&cpuid_entries[nent], func, 0,
2539                              &nent, cpuid->nent);
2540
2541
2542
2543         r = -E2BIG;
2544         if (nent >= cpuid->nent)
2545                 goto out_free;
2546
2547         /* Add support for Centaur's CPUID instruction. */
2548         if (boot_cpu_data.x86_vendor == X86_VENDOR_CENTAUR) {
2549                 do_cpuid_ent(&cpuid_entries[nent], 0xC0000000, 0,
2550                                 &nent, cpuid->nent);
2551
2552                 r = -E2BIG;
2553                 if (nent >= cpuid->nent)
2554                         goto out_free;
2555
2556                 limit = cpuid_entries[nent - 1].eax;
2557                 for (func = 0xC0000001;
2558                         func <= limit && nent < cpuid->nent; ++func)
2559                         do_cpuid_ent(&cpuid_entries[nent], func, 0,
2560                                         &nent, cpuid->nent);
2561
2562                 r = -E2BIG;
2563                 if (nent >= cpuid->nent)
2564                         goto out_free;
2565         }
2566
2567         do_cpuid_ent(&cpuid_entries[nent], KVM_CPUID_SIGNATURE, 0, &nent,
2568                      cpuid->nent);
2569
2570         r = -E2BIG;
2571         if (nent >= cpuid->nent)
2572                 goto out_free;
2573
2574         do_cpuid_ent(&cpuid_entries[nent], KVM_CPUID_FEATURES, 0, &nent,
2575                      cpuid->nent);
2576
2577         r = -E2BIG;
2578         if (nent >= cpuid->nent)
2579                 goto out_free;
2580
2581         r = -EFAULT;
2582         if (copy_to_user(entries, cpuid_entries,
2583                          nent * sizeof(struct kvm_cpuid_entry2)))
2584                 goto out_free;
2585         cpuid->nent = nent;
2586         r = 0;
2587
2588 out_free:
2589         vfree(cpuid_entries);
2590 out:
2591         return r;
2592 }
2593
2594 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
2595                                     struct kvm_lapic_state *s)
2596 {
2597         memcpy(s->regs, vcpu->arch.apic->regs, sizeof *s);
2598
2599         return 0;
2600 }
2601
2602 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
2603                                     struct kvm_lapic_state *s)
2604 {
2605         memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s);
2606         kvm_apic_post_state_restore(vcpu);
2607         update_cr8_intercept(vcpu);
2608
2609         return 0;
2610 }
2611
2612 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
2613                                     struct kvm_interrupt *irq)
2614 {
2615         if (irq->irq < 0 || irq->irq >= 256)
2616                 return -EINVAL;
2617         if (irqchip_in_kernel(vcpu->kvm))
2618                 return -ENXIO;
2619
2620         kvm_queue_interrupt(vcpu, irq->irq, false);
2621         kvm_make_request(KVM_REQ_EVENT, vcpu);
2622
2623         return 0;
2624 }
2625
2626 static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu)
2627 {
2628         kvm_inject_nmi(vcpu);
2629
2630         return 0;
2631 }
2632
2633 static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu,
2634                                            struct kvm_tpr_access_ctl *tac)
2635 {
2636         if (tac->flags)
2637                 return -EINVAL;
2638         vcpu->arch.tpr_access_reporting = !!tac->enabled;
2639         return 0;
2640 }
2641
2642 static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu,
2643                                         u64 mcg_cap)
2644 {
2645         int r;
2646         unsigned bank_num = mcg_cap & 0xff, bank;
2647
2648         r = -EINVAL;
2649         if (!bank_num || bank_num >= KVM_MAX_MCE_BANKS)
2650                 goto out;
2651         if (mcg_cap & ~(KVM_MCE_CAP_SUPPORTED | 0xff | 0xff0000))
2652                 goto out;
2653         r = 0;
2654         vcpu->arch.mcg_cap = mcg_cap;
2655         /* Init IA32_MCG_CTL to all 1s */
2656         if (mcg_cap & MCG_CTL_P)
2657                 vcpu->arch.mcg_ctl = ~(u64)0;
2658         /* Init IA32_MCi_CTL to all 1s */
2659         for (bank = 0; bank < bank_num; bank++)
2660                 vcpu->arch.mce_banks[bank*4] = ~(u64)0;
2661 out:
2662         return r;
2663 }
2664
2665 static int kvm_vcpu_ioctl_x86_set_mce(struct kvm_vcpu *vcpu,
2666                                       struct kvm_x86_mce *mce)
2667 {
2668         u64 mcg_cap = vcpu->arch.mcg_cap;
2669         unsigned bank_num = mcg_cap & 0xff;
2670         u64 *banks = vcpu->arch.mce_banks;
2671
2672         if (mce->bank >= bank_num || !(mce->status & MCI_STATUS_VAL))
2673                 return -EINVAL;
2674         /*
2675          * if IA32_MCG_CTL is not all 1s, the uncorrected error
2676          * reporting is disabled
2677          */
2678         if ((mce->status & MCI_STATUS_UC) && (mcg_cap & MCG_CTL_P) &&
2679             vcpu->arch.mcg_ctl != ~(u64)0)
2680                 return 0;
2681         banks += 4 * mce->bank;
2682         /*
2683          * if IA32_MCi_CTL is not all 1s, the uncorrected error
2684          * reporting is disabled for the bank
2685          */
2686         if ((mce->status & MCI_STATUS_UC) && banks[0] != ~(u64)0)
2687                 return 0;
2688         if (mce->status & MCI_STATUS_UC) {
2689                 if ((vcpu->arch.mcg_status & MCG_STATUS_MCIP) ||
2690                     !kvm_read_cr4_bits(vcpu, X86_CR4_MCE)) {
2691                         kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
2692                         return 0;
2693                 }
2694                 if (banks[1] & MCI_STATUS_VAL)
2695                         mce->status |= MCI_STATUS_OVER;
2696                 banks[2] = mce->addr;
2697                 banks[3] = mce->misc;
2698                 vcpu->arch.mcg_status = mce->mcg_status;
2699                 banks[1] = mce->status;
2700                 kvm_queue_exception(vcpu, MC_VECTOR);
2701         } else if (!(banks[1] & MCI_STATUS_VAL)
2702                    || !(banks[1] & MCI_STATUS_UC)) {
2703                 if (banks[1] & MCI_STATUS_VAL)
2704                         mce->status |= MCI_STATUS_OVER;
2705                 banks[2] = mce->addr;
2706                 banks[3] = mce->misc;
2707                 banks[1] = mce->status;
2708         } else
2709                 banks[1] |= MCI_STATUS_OVER;
2710         return 0;
2711 }
2712
2713 static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu,
2714                                                struct kvm_vcpu_events *events)
2715 {
2716         events->exception.injected =
2717                 vcpu->arch.exception.pending &&
2718                 !kvm_exception_is_soft(vcpu->arch.exception.nr);
2719         events->exception.nr = vcpu->arch.exception.nr;
2720         events->exception.has_error_code = vcpu->arch.exception.has_error_code;
2721         events->exception.pad = 0;
2722         events->exception.error_code = vcpu->arch.exception.error_code;
2723
2724         events->interrupt.injected =
2725                 vcpu->arch.interrupt.pending && !vcpu->arch.interrupt.soft;
2726         events->interrupt.nr = vcpu->arch.interrupt.nr;
2727         events->interrupt.soft = 0;
2728         events->interrupt.shadow =
2729                 kvm_x86_ops->get_interrupt_shadow(vcpu,
2730                         KVM_X86_SHADOW_INT_MOV_SS | KVM_X86_SHADOW_INT_STI);
2731
2732         events->nmi.injected = vcpu->arch.nmi_injected;
2733         events->nmi.pending = vcpu->arch.nmi_pending;
2734         events->nmi.masked = kvm_x86_ops->get_nmi_mask(vcpu);
2735         events->nmi.pad = 0;
2736
2737         events->sipi_vector = vcpu->arch.sipi_vector;
2738
2739         events->flags = (KVM_VCPUEVENT_VALID_NMI_PENDING
2740                          | KVM_VCPUEVENT_VALID_SIPI_VECTOR
2741                          | KVM_VCPUEVENT_VALID_SHADOW);
2742         memset(&events->reserved, 0, sizeof(events->reserved));
2743 }
2744
2745 static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu,
2746                                               struct kvm_vcpu_events *events)
2747 {
2748         if (events->flags & ~(KVM_VCPUEVENT_VALID_NMI_PENDING
2749                               | KVM_VCPUEVENT_VALID_SIPI_VECTOR
2750                               | KVM_VCPUEVENT_VALID_SHADOW))
2751                 return -EINVAL;
2752
2753         vcpu->arch.exception.pending = events->exception.injected;
2754         vcpu->arch.exception.nr = events->exception.nr;
2755         vcpu->arch.exception.has_error_code = events->exception.has_error_code;
2756         vcpu->arch.exception.error_code = events->exception.error_code;
2757
2758         vcpu->arch.interrupt.pending = events->interrupt.injected;
2759         vcpu->arch.interrupt.nr = events->interrupt.nr;
2760         vcpu->arch.interrupt.soft = events->interrupt.soft;
2761         if (events->flags & KVM_VCPUEVENT_VALID_SHADOW)
2762                 kvm_x86_ops->set_interrupt_shadow(vcpu,
2763                                                   events->interrupt.shadow);
2764
2765         vcpu->arch.nmi_injected = events->nmi.injected;
2766         if (events->flags & KVM_VCPUEVENT_VALID_NMI_PENDING)
2767                 vcpu->arch.nmi_pending = events->nmi.pending;
2768         kvm_x86_ops->set_nmi_mask(vcpu, events->nmi.masked);
2769
2770         if (events->flags & KVM_VCPUEVENT_VALID_SIPI_VECTOR)
2771                 vcpu->arch.sipi_vector = events->sipi_vector;
2772
2773         kvm_make_request(KVM_REQ_EVENT, vcpu);
2774
2775         return 0;
2776 }
2777
2778 static void kvm_vcpu_ioctl_x86_get_debugregs(struct kvm_vcpu *vcpu,
2779                                              struct kvm_debugregs *dbgregs)
2780 {
2781         memcpy(dbgregs->db, vcpu->arch.db, sizeof(vcpu->arch.db));
2782         dbgregs->dr6 = vcpu->arch.dr6;
2783         dbgregs->dr7 = vcpu->arch.dr7;
2784         dbgregs->flags = 0;
2785         memset(&dbgregs->reserved, 0, sizeof(dbgregs->reserved));
2786 }
2787
2788 static int kvm_vcpu_ioctl_x86_set_debugregs(struct kvm_vcpu *vcpu,
2789                                             struct kvm_debugregs *dbgregs)
2790 {
2791         if (dbgregs->flags)
2792                 return -EINVAL;
2793
2794         memcpy(vcpu->arch.db, dbgregs->db, sizeof(vcpu->arch.db));
2795         vcpu->arch.dr6 = dbgregs->dr6;
2796         vcpu->arch.dr7 = dbgregs->dr7;
2797
2798         return 0;
2799 }
2800
2801 static void kvm_vcpu_ioctl_x86_get_xsave(struct kvm_vcpu *vcpu,
2802                                          struct kvm_xsave *guest_xsave)
2803 {
2804         if (cpu_has_xsave)
2805                 memcpy(guest_xsave->region,
2806                         &vcpu->arch.guest_fpu.state->xsave,
2807                         xstate_size);
2808         else {
2809                 memcpy(guest_xsave->region,
2810                         &vcpu->arch.guest_fpu.state->fxsave,
2811                         sizeof(struct i387_fxsave_struct));
2812                 *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)] =
2813                         XSTATE_FPSSE;
2814         }
2815 }
2816
2817 static int kvm_vcpu_ioctl_x86_set_xsave(struct kvm_vcpu *vcpu,
2818                                         struct kvm_xsave *guest_xsave)
2819 {
2820         u64 xstate_bv =
2821                 *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)];
2822
2823         if (cpu_has_xsave)
2824                 memcpy(&vcpu->arch.guest_fpu.state->xsave,
2825                         guest_xsave->region, xstate_size);
2826         else {
2827                 if (xstate_bv & ~XSTATE_FPSSE)
2828                         return -EINVAL;
2829                 memcpy(&vcpu->arch.guest_fpu.state->fxsave,
2830                         guest_xsave->region, sizeof(struct i387_fxsave_struct));
2831         }
2832         return 0;
2833 }
2834
2835 static void kvm_vcpu_ioctl_x86_get_xcrs(struct kvm_vcpu *vcpu,
2836                                         struct kvm_xcrs *guest_xcrs)
2837 {
2838         if (!cpu_has_xsave) {
2839                 guest_xcrs->nr_xcrs = 0;
2840                 return;
2841         }
2842
2843         guest_xcrs->nr_xcrs = 1;
2844         guest_xcrs->flags = 0;
2845         guest_xcrs->xcrs[0].xcr = XCR_XFEATURE_ENABLED_MASK;
2846         guest_xcrs->xcrs[0].value = vcpu->arch.xcr0;
2847 }
2848
2849 static int kvm_vcpu_ioctl_x86_set_xcrs(struct kvm_vcpu *vcpu,
2850                                        struct kvm_xcrs *guest_xcrs)
2851 {
2852         int i, r = 0;
2853
2854         if (!cpu_has_xsave)
2855                 return -EINVAL;
2856
2857         if (guest_xcrs->nr_xcrs > KVM_MAX_XCRS || guest_xcrs->flags)
2858                 return -EINVAL;
2859
2860         for (i = 0; i < guest_xcrs->nr_xcrs; i++)
2861                 /* Only support XCR0 currently */
2862                 if (guest_xcrs->xcrs[0].xcr == XCR_XFEATURE_ENABLED_MASK) {
2863                         r = __kvm_set_xcr(vcpu, XCR_XFEATURE_ENABLED_MASK,
2864                                 guest_xcrs->xcrs[0].value);
2865                         break;
2866                 }
2867         if (r)
2868                 r = -EINVAL;
2869         return r;
2870 }
2871
2872 long kvm_arch_vcpu_ioctl(struct file *filp,
2873                          unsigned int ioctl, unsigned long arg)
2874 {
2875         struct kvm_vcpu *vcpu = filp->private_data;
2876         void __user *argp = (void __user *)arg;
2877         int r;
2878         union {
2879                 struct kvm_lapic_state *lapic;
2880                 struct kvm_xsave *xsave;
2881                 struct kvm_xcrs *xcrs;
2882                 void *buffer;
2883         } u;
2884
2885         u.buffer = NULL;
2886         switch (ioctl) {
2887         case KVM_GET_LAPIC: {
2888                 r = -EINVAL;
2889                 if (!vcpu->arch.apic)
2890                         goto out;
2891                 u.lapic = kzalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL);
2892
2893                 r = -ENOMEM;
2894                 if (!u.lapic)
2895                         goto out;
2896                 r = kvm_vcpu_ioctl_get_lapic(vcpu, u.lapic);
2897                 if (r)
2898                         goto out;
2899                 r = -EFAULT;
2900                 if (copy_to_user(argp, u.lapic, sizeof(struct kvm_lapic_state)))
2901                         goto out;
2902                 r = 0;
2903                 break;
2904         }
2905         case KVM_SET_LAPIC: {
2906                 r = -EINVAL;
2907                 if (!vcpu->arch.apic)
2908                         goto out;
2909                 u.lapic = kmalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL);
2910                 r = -ENOMEM;
2911                 if (!u.lapic)
2912                         goto out;
2913                 r = -EFAULT;
2914                 if (copy_from_user(u.lapic, argp, sizeof(struct kvm_lapic_state)))
2915                         goto out;
2916                 r = kvm_vcpu_ioctl_set_lapic(vcpu, u.lapic);
2917                 if (r)
2918                         goto out;
2919                 r = 0;
2920                 break;
2921         }
2922         case KVM_INTERRUPT: {
2923                 struct kvm_interrupt irq;
2924
2925                 r = -EFAULT;
2926                 if (copy_from_user(&irq, argp, sizeof irq))
2927                         goto out;
2928                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
2929                 if (r)
2930                         goto out;
2931                 r = 0;
2932                 break;
2933         }
2934         case KVM_NMI: {
2935                 r = kvm_vcpu_ioctl_nmi(vcpu);
2936                 if (r)
2937                         goto out;
2938                 r = 0;
2939                 break;
2940         }
2941         case KVM_SET_CPUID: {
2942                 struct kvm_cpuid __user *cpuid_arg = argp;
2943                 struct kvm_cpuid cpuid;
2944
2945                 r = -EFAULT;
2946                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2947                         goto out;
2948                 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
2949                 if (r)
2950                         goto out;
2951                 break;
2952         }
2953         case KVM_SET_CPUID2: {
2954                 struct kvm_cpuid2 __user *cpuid_arg = argp;
2955                 struct kvm_cpuid2 cpuid;
2956
2957                 r = -EFAULT;
2958                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2959                         goto out;
2960                 r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid,
2961                                               cpuid_arg->entries);
2962                 if (r)
2963                         goto out;
2964                 break;
2965         }
2966         case KVM_GET_CPUID2: {
2967                 struct kvm_cpuid2 __user *cpuid_arg = argp;
2968                 struct kvm_cpuid2 cpuid;
2969
2970                 r = -EFAULT;
2971                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2972                         goto out;
2973                 r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid,
2974                                               cpuid_arg->entries);
2975                 if (r)
2976                         goto out;
2977                 r = -EFAULT;
2978                 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
2979                         goto out;
2980                 r = 0;
2981                 break;
2982         }
2983         case KVM_GET_MSRS:
2984                 r = msr_io(vcpu, argp, kvm_get_msr, 1);
2985                 break;
2986         case KVM_SET_MSRS:
2987                 r = msr_io(vcpu, argp, do_set_msr, 0);
2988                 break;
2989         case KVM_TPR_ACCESS_REPORTING: {
2990                 struct kvm_tpr_access_ctl tac;
2991
2992                 r = -EFAULT;
2993                 if (copy_from_user(&tac, argp, sizeof tac))
2994                         goto out;
2995                 r = vcpu_ioctl_tpr_access_reporting(vcpu, &tac);
2996                 if (r)
2997                         goto out;
2998                 r = -EFAULT;
2999                 if (copy_to_user(argp, &tac, sizeof tac))
3000                         goto out;
3001                 r = 0;
3002                 break;
3003         };
3004         case KVM_SET_VAPIC_ADDR: {
3005                 struct kvm_vapic_addr va;
3006
3007                 r = -EINVAL;
3008                 if (!irqchip_in_kernel(vcpu->kvm))
3009                         goto out;
3010                 r = -EFAULT;
3011                 if (copy_from_user(&va, argp, sizeof va))
3012                         goto out;
3013                 r = 0;
3014                 kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr);
3015                 break;
3016         }
3017         case KVM_X86_SETUP_MCE: {
3018                 u64 mcg_cap;
3019
3020                 r = -EFAULT;
3021                 if (copy_from_user(&mcg_cap, argp, sizeof mcg_cap))
3022                         goto out;
3023                 r = kvm_vcpu_ioctl_x86_setup_mce(vcpu, mcg_cap);
3024                 break;
3025         }
3026         case KVM_X86_SET_MCE: {
3027                 struct kvm_x86_mce mce;
3028
3029                 r = -EFAULT;
3030                 if (copy_from_user(&mce, argp, sizeof mce))
3031                         goto out;
3032                 r = kvm_vcpu_ioctl_x86_set_mce(vcpu, &mce);
3033                 break;
3034         }
3035         case KVM_GET_VCPU_EVENTS: {
3036                 struct kvm_vcpu_events events;
3037
3038                 kvm_vcpu_ioctl_x86_get_vcpu_events(vcpu, &events);
3039
3040                 r = -EFAULT;
3041                 if (copy_to_user(argp, &events, sizeof(struct kvm_vcpu_events)))
3042                         break;
3043                 r = 0;
3044                 break;
3045         }
3046         case KVM_SET_VCPU_EVENTS: {
3047                 struct kvm_vcpu_events events;
3048
3049                 r = -EFAULT;
3050                 if (copy_from_user(&events, argp, sizeof(struct kvm_vcpu_events)))
3051                         break;
3052
3053                 r = kvm_vcpu_ioctl_x86_set_vcpu_events(vcpu, &events);
3054                 break;
3055         }
3056         case KVM_GET_DEBUGREGS: {
3057                 struct kvm_debugregs dbgregs;
3058
3059                 kvm_vcpu_ioctl_x86_get_debugregs(vcpu, &dbgregs);
3060
3061                 r = -EFAULT;
3062                 if (copy_to_user(argp, &dbgregs,
3063                                  sizeof(struct kvm_debugregs)))
3064                         break;
3065                 r = 0;
3066                 break;
3067         }
3068         case KVM_SET_DEBUGREGS: {
3069                 struct kvm_debugregs dbgregs;
3070
3071                 r = -EFAULT;
3072                 if (copy_from_user(&dbgregs, argp,
3073                                    sizeof(struct kvm_debugregs)))
3074                         break;
3075
3076                 r = kvm_vcpu_ioctl_x86_set_debugregs(vcpu, &dbgregs);
3077                 break;
3078         }
3079         case KVM_GET_XSAVE: {
3080                 u.xsave = kzalloc(sizeof(struct kvm_xsave), GFP_KERNEL);
3081                 r = -ENOMEM;
3082                 if (!u.xsave)
3083                         break;
3084
3085                 kvm_vcpu_ioctl_x86_get_xsave(vcpu, u.xsave);
3086
3087                 r = -EFAULT;
3088                 if (copy_to_user(argp, u.xsave, sizeof(struct kvm_xsave)))
3089                         break;
3090                 r = 0;
3091                 break;
3092         }
3093         case KVM_SET_XSAVE: {
3094                 u.xsave = kzalloc(sizeof(struct kvm_xsave), GFP_KERNEL);
3095                 r = -ENOMEM;
3096                 if (!u.xsave)
3097                         break;
3098
3099                 r = -EFAULT;
3100                 if (copy_from_user(u.xsave, argp, sizeof(struct kvm_xsave)))
3101                         break;
3102
3103                 r = kvm_vcpu_ioctl_x86_set_xsave(vcpu, u.xsave);
3104                 break;
3105         }
3106         case KVM_GET_XCRS: {
3107                 u.xcrs = kzalloc(sizeof(struct kvm_xcrs), GFP_KERNEL);
3108                 r = -ENOMEM;
3109                 if (!u.xcrs)
3110                         break;
3111
3112                 kvm_vcpu_ioctl_x86_get_xcrs(vcpu, u.xcrs);
3113
3114                 r = -EFAULT;
3115                 if (copy_to_user(argp, u.xcrs,
3116                                  sizeof(struct kvm_xcrs)))
3117                         break;
3118                 r = 0;
3119                 break;
3120         }
3121         case KVM_SET_XCRS: {
3122                 u.xcrs = kzalloc(sizeof(struct kvm_xcrs), GFP_KERNEL);
3123                 r = -ENOMEM;
3124                 if (!u.xcrs)
3125                         break;
3126
3127                 r = -EFAULT;
3128                 if (copy_from_user(u.xcrs, argp,
3129                                    sizeof(struct kvm_xcrs)))
3130                         break;
3131
3132                 r = kvm_vcpu_ioctl_x86_set_xcrs(vcpu, u.xcrs);
3133                 break;
3134         }
3135         case KVM_SET_TSC_KHZ: {
3136                 u32 user_tsc_khz;
3137
3138                 r = -EINVAL;
3139                 if (!kvm_has_tsc_control)
3140                         break;
3141
3142                 user_tsc_khz = (u32)arg;
3143
3144                 if (user_tsc_khz >= kvm_max_guest_tsc_khz)
3145                         goto out;
3146
3147                 kvm_x86_ops->set_tsc_khz(vcpu, user_tsc_khz);
3148
3149                 r = 0;
3150                 goto out;
3151         }
3152         case KVM_GET_TSC_KHZ: {
3153                 r = -EIO;
3154                 if (check_tsc_unstable())
3155                         goto out;
3156
3157                 r = vcpu_tsc_khz(vcpu);
3158
3159                 goto out;
3160         }
3161         default:
3162                 r = -EINVAL;
3163         }
3164 out:
3165         kfree(u.buffer);
3166         return r;
3167 }
3168
3169 static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr)
3170 {
3171         int ret;
3172
3173         if (addr > (unsigned int)(-3 * PAGE_SIZE))
3174                 return -1;
3175         ret = kvm_x86_ops->set_tss_addr(kvm, addr);
3176         return ret;
3177 }
3178
3179 static int kvm_vm_ioctl_set_identity_map_addr(struct kvm *kvm,
3180                                               u64 ident_addr)
3181 {
3182         kvm->arch.ept_identity_map_addr = ident_addr;
3183         return 0;
3184 }
3185
3186 static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
3187                                           u32 kvm_nr_mmu_pages)
3188 {
3189         if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES)
3190                 return -EINVAL;
3191
3192         mutex_lock(&kvm->slots_lock);
3193         spin_lock(&kvm->mmu_lock);
3194
3195         kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
3196         kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages;
3197
3198         spin_unlock(&kvm->mmu_lock);
3199         mutex_unlock(&kvm->slots_lock);
3200         return 0;
3201 }
3202
3203 static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
3204 {
3205         return kvm->arch.n_max_mmu_pages;
3206 }
3207
3208 static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
3209 {
3210         int r;
3211
3212         r = 0;
3213         switch (chip->chip_id) {
3214         case KVM_IRQCHIP_PIC_MASTER:
3215                 memcpy(&chip->chip.pic,
3216                         &pic_irqchip(kvm)->pics[0],
3217                         sizeof(struct kvm_pic_state));
3218                 break;
3219         case KVM_IRQCHIP_PIC_SLAVE:
3220                 memcpy(&chip->chip.pic,
3221                         &pic_irqchip(kvm)->pics[1],
3222                         sizeof(struct kvm_pic_state));
3223                 break;
3224         case KVM_IRQCHIP_IOAPIC:
3225                 r = kvm_get_ioapic(kvm, &chip->chip.ioapic);
3226                 break;
3227         default:
3228                 r = -EINVAL;
3229                 break;
3230         }
3231         return r;
3232 }
3233
3234 static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
3235 {
3236         int r;
3237
3238         r = 0;
3239         switch (chip->chip_id) {
3240         case KVM_IRQCHIP_PIC_MASTER:
3241                 spin_lock(&pic_irqchip(kvm)->lock);
3242                 memcpy(&pic_irqchip(kvm)->pics[0],
3243                         &chip->chip.pic,
3244                         sizeof(struct kvm_pic_state));
3245                 spin_unlock(&pic_irqchip(kvm)->lock);
3246                 break;
3247         case KVM_IRQCHIP_PIC_SLAVE:
3248                 spin_lock(&pic_irqchip(kvm)->lock);
3249                 memcpy(&pic_irqchip(kvm)->pics[1],
3250                         &chip->chip.pic,
3251                         sizeof(struct kvm_pic_state));
3252                 spin_unlock(&pic_irqchip(kvm)->lock);
3253                 break;
3254         case KVM_IRQCHIP_IOAPIC:
3255                 r = kvm_set_ioapic(kvm, &chip->chip.ioapic);
3256                 break;
3257         default:
3258                 r = -EINVAL;
3259                 break;
3260         }
3261         kvm_pic_update_irq(pic_irqchip(kvm));
3262         return r;
3263 }
3264
3265 static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps)
3266 {
3267         int r = 0;
3268
3269         mutex_lock(&kvm->arch.vpit->pit_state.lock);
3270         memcpy(ps, &kvm->arch.vpit->pit_state, sizeof(struct kvm_pit_state));
3271         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3272         return r;
3273 }
3274
3275 static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps)
3276 {
3277         int r = 0;
3278
3279         mutex_lock(&kvm->arch.vpit->pit_state.lock);
3280         memcpy(&kvm->arch.vpit->pit_state, ps, sizeof(struct kvm_pit_state));
3281         kvm_pit_load_count(kvm, 0, ps->channels[0].count, 0);
3282         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3283         return r;
3284 }
3285
3286 static int kvm_vm_ioctl_get_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
3287 {
3288         int r = 0;
3289
3290         mutex_lock(&kvm->arch.vpit->pit_state.lock);
3291         memcpy(ps->channels, &kvm->arch.vpit->pit_state.channels,
3292                 sizeof(ps->channels));
3293         ps->flags = kvm->arch.vpit->pit_state.flags;
3294         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3295         memset(&ps->reserved, 0, sizeof(ps->reserved));
3296         return r;
3297 }
3298
3299 static int kvm_vm_ioctl_set_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
3300 {
3301         int r = 0, start = 0;
3302         u32 prev_legacy, cur_legacy;
3303         mutex_lock(&kvm->arch.vpit->pit_state.lock);
3304         prev_legacy = kvm->arch.vpit->pit_state.flags & KVM_PIT_FLAGS_HPET_LEGACY;
3305         cur_legacy = ps->flags & KVM_PIT_FLAGS_HPET_LEGACY;
3306         if (!prev_legacy && cur_legacy)
3307                 start = 1;
3308         memcpy(&kvm->arch.vpit->pit_state.channels, &ps->channels,
3309                sizeof(kvm->arch.vpit->pit_state.channels));
3310         kvm->arch.vpit->pit_state.flags = ps->flags;
3311         kvm_pit_load_count(kvm, 0, kvm->arch.vpit->pit_state.channels[0].count, start);
3312         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3313         return r;
3314 }
3315
3316 static int kvm_vm_ioctl_reinject(struct kvm *kvm,
3317                                  struct kvm_reinject_control *control)
3318 {
3319         if (!kvm->arch.vpit)
3320                 return -ENXIO;
3321         mutex_lock(&kvm->arch.vpit->pit_state.lock);
3322         kvm->arch.vpit->pit_state.pit_timer.reinject = control->pit_reinject;
3323         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3324         return 0;
3325 }
3326
3327 /*
3328  * Get (and clear) the dirty memory log for a memory slot.
3329  */
3330 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
3331                                       struct kvm_dirty_log *log)
3332 {
3333         int r, i;
3334         struct kvm_memory_slot *memslot;
3335         unsigned long n;
3336         unsigned long is_dirty = 0;
3337
3338         mutex_lock(&kvm->slots_lock);
3339
3340         r = -EINVAL;
3341         if (log->slot >= KVM_MEMORY_SLOTS)
3342                 goto out;
3343
3344         memslot = &kvm->memslots->memslots[log->slot];
3345         r = -ENOENT;
3346         if (!memslot->dirty_bitmap)
3347                 goto out;
3348
3349         n = kvm_dirty_bitmap_bytes(memslot);
3350
3351         for (i = 0; !is_dirty && i < n/sizeof(long); i++)
3352                 is_dirty = memslot->dirty_bitmap[i];
3353
3354         /* If nothing is dirty, don't bother messing with page tables. */
3355         if (is_dirty) {
3356                 struct kvm_memslots *slots, *old_slots;
3357                 unsigned long *dirty_bitmap;
3358
3359                 dirty_bitmap = memslot->dirty_bitmap_head;
3360                 if (memslot->dirty_bitmap == dirty_bitmap)
3361                         dirty_bitmap += n / sizeof(long);
3362                 memset(dirty_bitmap, 0, n);
3363
3364                 r = -ENOMEM;
3365                 slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
3366                 if (!slots)
3367                         goto out;
3368                 memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
3369                 slots->memslots[log->slot].dirty_bitmap = dirty_bitmap;
3370                 slots->generation++;
3371
3372                 old_slots = kvm->memslots;
3373                 rcu_assign_pointer(kvm->memslots, slots);
3374                 synchronize_srcu_expedited(&kvm->srcu);
3375                 dirty_bitmap = old_slots->memslots[log->slot].dirty_bitmap;
3376                 kfree(old_slots);
3377
3378                 spin_lock(&kvm->mmu_lock);
3379                 kvm_mmu_slot_remove_write_access(kvm, log->slot);
3380                 spin_unlock(&kvm->mmu_lock);
3381
3382                 r = -EFAULT;
3383                 if (copy_to_user(log->dirty_bitmap, dirty_bitmap, n))
3384                         goto out;
3385         } else {
3386                 r = -EFAULT;
3387                 if (clear_user(log->dirty_bitmap, n))
3388                         goto out;
3389         }
3390
3391         r = 0;
3392 out:
3393         mutex_unlock(&kvm->slots_lock);
3394         return r;
3395 }
3396
3397 long kvm_arch_vm_ioctl(struct file *filp,
3398                        unsigned int ioctl, unsigned long arg)
3399 {
3400         struct kvm *kvm = filp->private_data;
3401         void __user *argp = (void __user *)arg;
3402         int r = -ENOTTY;
3403         /*
3404          * This union makes it completely explicit to gcc-3.x
3405          * that these two variables' stack usage should be
3406          * combined, not added together.
3407          */
3408         union {
3409                 struct kvm_pit_state ps;
3410                 struct kvm_pit_state2 ps2;
3411                 struct kvm_pit_config pit_config;
3412         } u;
3413
3414         switch (ioctl) {
3415         case KVM_SET_TSS_ADDR:
3416                 r = kvm_vm_ioctl_set_tss_addr(kvm, arg);
3417                 if (r < 0)
3418                         goto out;
3419                 break;
3420         case KVM_SET_IDENTITY_MAP_ADDR: {
3421                 u64 ident_addr;
3422
3423                 r = -EFAULT;
3424                 if (copy_from_user(&ident_addr, argp, sizeof ident_addr))
3425                         goto out;
3426                 r = kvm_vm_ioctl_set_identity_map_addr(kvm, ident_addr);
3427                 if (r < 0)
3428                         goto out;
3429                 break;
3430         }
3431         case KVM_SET_NR_MMU_PAGES:
3432                 r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);
3433                 if (r)
3434                         goto out;
3435                 break;
3436         case KVM_GET_NR_MMU_PAGES:
3437                 r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
3438                 break;
3439         case KVM_CREATE_IRQCHIP: {
3440                 struct kvm_pic *vpic;
3441
3442                 mutex_lock(&kvm->lock);
3443                 r = -EEXIST;
3444                 if (kvm->arch.vpic)
3445                         goto create_irqchip_unlock;
3446                 r = -ENOMEM;
3447                 vpic = kvm_create_pic(kvm);
3448                 if (vpic) {
3449                         r = kvm_ioapic_init(kvm);
3450                         if (r) {
3451                                 mutex_lock(&kvm->slots_lock);
3452                                 kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS,
3453                                                           &vpic->dev);
3454                                 mutex_unlock(&kvm->slots_lock);
3455                                 kfree(vpic);
3456                                 goto create_irqchip_unlock;
3457                         }
3458                 } else
3459                         goto create_irqchip_unlock;
3460                 smp_wmb();
3461                 kvm->arch.vpic = vpic;
3462                 smp_wmb();
3463                 r = kvm_setup_default_irq_routing(kvm);
3464                 if (r) {
3465                         mutex_lock(&kvm->slots_lock);
3466                         mutex_lock(&kvm->irq_lock);
3467                         kvm_ioapic_destroy(kvm);
3468                         kvm_destroy_pic(kvm);
3469                         mutex_unlock(&kvm->irq_lock);
3470                         mutex_unlock(&kvm->slots_lock);
3471                 }
3472         create_irqchip_unlock:
3473                 mutex_unlock(&kvm->lock);
3474                 break;
3475         }
3476         case KVM_CREATE_PIT:
3477                 u.pit_config.flags = KVM_PIT_SPEAKER_DUMMY;
3478                 goto create_pit;
3479         case KVM_CREATE_PIT2:
3480                 r = -EFAULT;
3481                 if (copy_from_user(&u.pit_config, argp,
3482                                    sizeof(struct kvm_pit_config)))
3483                         goto out;
3484         create_pit:
3485                 mutex_lock(&kvm->slots_lock);
3486                 r = -EEXIST;
3487                 if (kvm->arch.vpit)
3488                         goto create_pit_unlock;
3489                 r = -ENOMEM;
3490                 kvm->arch.vpit = kvm_create_pit(kvm, u.pit_config.flags);
3491                 if (kvm->arch.vpit)
3492                         r = 0;
3493         create_pit_unlock:
3494                 mutex_unlock(&kvm->slots_lock);
3495                 break;
3496         case KVM_IRQ_LINE_STATUS:
3497         case KVM_IRQ_LINE: {
3498                 struct kvm_irq_level irq_event;
3499
3500                 r = -EFAULT;
3501                 if (copy_from_user(&irq_event, argp, sizeof irq_event))
3502                         goto out;
3503                 r = -ENXIO;
3504                 if (irqchip_in_kernel(kvm)) {
3505                         __s32 status;
3506                         status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID,
3507                                         irq_event.irq, irq_event.level);
3508                         if (ioctl == KVM_IRQ_LINE_STATUS) {
3509                                 r = -EFAULT;
3510                                 irq_event.status = status;
3511                                 if (copy_to_user(argp, &irq_event,
3512                                                         sizeof irq_event))
3513                                         goto out;
3514                         }
3515                         r = 0;
3516                 }
3517                 break;
3518         }
3519         case KVM_GET_IRQCHIP: {
3520                 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
3521                 struct kvm_irqchip *chip = kmalloc(sizeof(*chip), GFP_KERNEL);
3522
3523                 r = -ENOMEM;
3524                 if (!chip)
3525                         goto out;
3526                 r = -EFAULT;
3527                 if (copy_from_user(chip, argp, sizeof *chip))
3528                         goto get_irqchip_out;
3529                 r = -ENXIO;
3530                 if (!irqchip_in_kernel(kvm))
3531                         goto get_irqchip_out;
3532                 r = kvm_vm_ioctl_get_irqchip(kvm, chip);
3533                 if (r)
3534                         goto get_irqchip_out;
3535                 r = -EFAULT;
3536                 if (copy_to_user(argp, chip, sizeof *chip))
3537                         goto get_irqchip_out;
3538                 r = 0;
3539         get_irqchip_out:
3540                 kfree(chip);
3541                 if (r)
3542                         goto out;
3543                 break;
3544         }
3545         case KVM_SET_IRQCHIP: {
3546                 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
3547                 struct kvm_irqchip *chip = kmalloc(sizeof(*chip), GFP_KERNEL);
3548
3549                 r = -ENOMEM;
3550                 if (!chip)
3551                         goto out;
3552                 r = -EFAULT;
3553                 if (copy_from_user(chip, argp, sizeof *chip))
3554                         goto set_irqchip_out;
3555                 r = -ENXIO;
3556                 if (!irqchip_in_kernel(kvm))
3557                         goto set_irqchip_out;
3558                 r = kvm_vm_ioctl_set_irqchip(kvm, chip);
3559                 if (r)
3560                         goto set_irqchip_out;
3561                 r = 0;
3562         set_irqchip_out:
3563                 kfree(chip);
3564                 if (r)
3565                         goto out;
3566                 break;
3567         }
3568         case KVM_GET_PIT: {
3569                 r = -EFAULT;
3570                 if (copy_from_user(&u.ps, argp, sizeof(struct kvm_pit_state)))
3571                         goto out;
3572                 r = -ENXIO;
3573                 if (!kvm->arch.vpit)
3574                         goto out;
3575                 r = kvm_vm_ioctl_get_pit(kvm, &u.ps);
3576                 if (r)
3577                         goto out;
3578                 r = -EFAULT;
3579                 if (copy_to_user(argp, &u.ps, sizeof(struct kvm_pit_state)))
3580                         goto out;
3581                 r = 0;
3582                 break;
3583         }
3584         case KVM_SET_PIT: {
3585                 r = -EFAULT;
3586                 if (copy_from_user(&u.ps, argp, sizeof u.ps))
3587                         goto out;
3588                 r = -ENXIO;
3589                 if (!kvm->arch.vpit)
3590                         goto out;
3591                 r = kvm_vm_ioctl_set_pit(kvm, &u.ps);
3592                 if (r)
3593                         goto out;
3594                 r = 0;
3595                 break;
3596         }
3597         case KVM_GET_PIT2: {
3598                 r = -ENXIO;
3599                 if (!kvm->arch.vpit)
3600                         goto out;
3601                 r = kvm_vm_ioctl_get_pit2(kvm, &u.ps2);
3602                 if (r)
3603                         goto out;
3604                 r = -EFAULT;
3605                 if (copy_to_user(argp, &u.ps2, sizeof(u.ps2)))
3606                         goto out;
3607                 r = 0;
3608                 break;
3609         }
3610         case KVM_SET_PIT2: {
3611                 r = -EFAULT;
3612                 if (copy_from_user(&u.ps2, argp, sizeof(u.ps2)))
3613                         goto out;
3614                 r = -ENXIO;
3615                 if (!kvm->arch.vpit)
3616                         goto out;
3617                 r = kvm_vm_ioctl_set_pit2(kvm, &u.ps2);
3618                 if (r)
3619                         goto out;
3620                 r = 0;
3621                 break;
3622         }
3623         case KVM_REINJECT_CONTROL: {
3624                 struct kvm_reinject_control control;
3625                 r =  -EFAULT;
3626                 if (copy_from_user(&control, argp, sizeof(control)))
3627                         goto out;
3628                 r = kvm_vm_ioctl_reinject(kvm, &control);
3629                 if (r)
3630                         goto out;
3631                 r = 0;
3632                 break;
3633         }
3634         case KVM_XEN_HVM_CONFIG: {
3635                 r = -EFAULT;
3636                 if (copy_from_user(&kvm->arch.xen_hvm_config, argp,
3637                                    sizeof(struct kvm_xen_hvm_config)))
3638                         goto out;
3639                 r = -EINVAL;
3640                 if (kvm->arch.xen_hvm_config.flags)
3641                         goto out;
3642                 r = 0;
3643                 break;
3644         }
3645         case KVM_SET_CLOCK: {
3646                 struct kvm_clock_data user_ns;
3647                 u64 now_ns;
3648                 s64 delta;
3649
3650                 r = -EFAULT;
3651                 if (copy_from_user(&user_ns, argp, sizeof(user_ns)))
3652                         goto out;
3653
3654                 r = -EINVAL;
3655                 if (user_ns.flags)
3656                         goto out;
3657
3658                 r = 0;
3659                 local_irq_disable();
3660                 now_ns = get_kernel_ns();
3661                 delta = user_ns.clock - now_ns;
3662                 local_irq_enable();
3663                 kvm->arch.kvmclock_offset = delta;
3664                 break;
3665         }
3666         case KVM_GET_CLOCK: {
3667                 struct kvm_clock_data user_ns;
3668                 u64 now_ns;
3669
3670                 local_irq_disable();
3671                 now_ns = get_kernel_ns();
3672                 user_ns.clock = kvm->arch.kvmclock_offset + now_ns;
3673                 local_irq_enable();
3674                 user_ns.flags = 0;
3675                 memset(&user_ns.pad, 0, sizeof(user_ns.pad));
3676
3677                 r = -EFAULT;
3678                 if (copy_to_user(argp, &user_ns, sizeof(user_ns)))
3679                         goto out;
3680                 r = 0;
3681                 break;
3682         }
3683
3684         default:
3685                 ;
3686         }
3687 out:
3688         return r;
3689 }
3690
3691 static void kvm_init_msr_list(void)
3692 {
3693         u32 dummy[2];
3694         unsigned i, j;
3695
3696         /* skip the first msrs in the list. KVM-specific */
3697         for (i = j = KVM_SAVE_MSRS_BEGIN; i < ARRAY_SIZE(msrs_to_save); i++) {
3698                 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
3699                         continue;
3700                 if (j < i)
3701                         msrs_to_save[j] = msrs_to_save[i];
3702                 j++;
3703         }
3704         num_msrs_to_save = j;
3705 }
3706
3707 static int vcpu_mmio_write(struct kvm_vcpu *vcpu, gpa_t addr, int len,
3708                            const void *v)
3709 {
3710         int handled = 0;
3711         int n;
3712
3713         do {
3714                 n = min(len, 8);
3715                 if (!(vcpu->arch.apic &&
3716                       !kvm_iodevice_write(&vcpu->arch.apic->dev, addr, n, v))
3717                     && kvm_io_bus_write(vcpu->kvm, KVM_MMIO_BUS, addr, n, v))
3718                         break;
3719                 handled += n;
3720                 addr += n;
3721                 len -= n;
3722                 v += n;
3723         } while (len);
3724
3725         return handled;
3726 }
3727
3728 static int vcpu_mmio_read(struct kvm_vcpu *vcpu, gpa_t addr, int len, void *v)
3729 {
3730         int handled = 0;
3731         int n;
3732
3733         do {
3734                 n = min(len, 8);
3735                 if (!(vcpu->arch.apic &&
3736                       !kvm_iodevice_read(&vcpu->arch.apic->dev, addr, n, v))
3737                     && kvm_io_bus_read(vcpu->kvm, KVM_MMIO_BUS, addr, n, v))
3738                         break;
3739                 trace_kvm_mmio(KVM_TRACE_MMIO_READ, n, addr, *(u64 *)v);
3740                 handled += n;
3741                 addr += n;
3742                 len -= n;
3743                 v += n;
3744         } while (len);
3745
3746         return handled;
3747 }
3748
3749 static void kvm_set_segment(struct kvm_vcpu *vcpu,
3750                         struct kvm_segment *var, int seg)
3751 {
3752         kvm_x86_ops->set_segment(vcpu, var, seg);
3753 }
3754
3755 void kvm_get_segment(struct kvm_vcpu *vcpu,
3756                      struct kvm_segment *var, int seg)
3757 {
3758         kvm_x86_ops->get_segment(vcpu, var, seg);
3759 }
3760
3761 static gpa_t translate_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 access)
3762 {
3763         return gpa;
3764 }
3765
3766 static gpa_t translate_nested_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 access)
3767 {
3768         gpa_t t_gpa;
3769         struct x86_exception exception;
3770
3771         BUG_ON(!mmu_is_nested(vcpu));
3772
3773         /* NPT walks are always user-walks */
3774         access |= PFERR_USER_MASK;
3775         t_gpa  = vcpu->arch.mmu.gva_to_gpa(vcpu, gpa, access, &exception);
3776
3777         return t_gpa;
3778 }
3779
3780 gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva,
3781                               struct x86_exception *exception)
3782 {
3783         u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3784         return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
3785 }
3786
3787  gpa_t kvm_mmu_gva_to_gpa_fetch(struct kvm_vcpu *vcpu, gva_t gva,
3788                                 struct x86_exception *exception)
3789 {
3790         u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3791         access |= PFERR_FETCH_MASK;
3792         return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
3793 }
3794
3795 gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva,
3796                                struct x86_exception *exception)
3797 {
3798         u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3799         access |= PFERR_WRITE_MASK;
3800         return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
3801 }
3802
3803 /* uses this to access any guest's mapped memory without checking CPL */
3804 gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva,
3805                                 struct x86_exception *exception)
3806 {
3807         return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, 0, exception);
3808 }
3809
3810 static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes,
3811                                       struct kvm_vcpu *vcpu, u32 access,
3812                                       struct x86_exception *exception)
3813 {
3814         void *data = val;
3815         int r = X86EMUL_CONTINUE;
3816
3817         while (bytes) {
3818                 gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, access,
3819                                                             exception);
3820                 unsigned offset = addr & (PAGE_SIZE-1);
3821                 unsigned toread = min(bytes, (unsigned)PAGE_SIZE - offset);
3822                 int ret;
3823
3824                 if (gpa == UNMAPPED_GVA)
3825                         return X86EMUL_PROPAGATE_FAULT;
3826                 ret = kvm_read_guest(vcpu->kvm, gpa, data, toread);
3827                 if (ret < 0) {
3828                         r = X86EMUL_IO_NEEDED;
3829                         goto out;
3830                 }
3831
3832                 bytes -= toread;
3833                 data += toread;
3834                 addr += toread;
3835         }
3836 out:
3837         return r;
3838 }
3839
3840 /* used for instruction fetching */
3841 static int kvm_fetch_guest_virt(struct x86_emulate_ctxt *ctxt,
3842                                 gva_t addr, void *val, unsigned int bytes,
3843                                 struct x86_exception *exception)
3844 {
3845         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
3846         u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3847
3848         return kvm_read_guest_virt_helper(addr, val, bytes, vcpu,
3849                                           access | PFERR_FETCH_MASK,
3850                                           exception);
3851 }
3852
3853 static int kvm_read_guest_virt(struct x86_emulate_ctxt *ctxt,
3854                                gva_t addr, void *val, unsigned int bytes,
3855                                struct x86_exception *exception)
3856 {
3857         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
3858         u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3859
3860         return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, access,
3861                                           exception);
3862 }
3863
3864 static int kvm_read_guest_virt_system(struct x86_emulate_ctxt *ctxt,
3865                                       gva_t addr, void *val, unsigned int bytes,
3866                                       struct x86_exception *exception)
3867 {
3868         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
3869         return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, 0, exception);
3870 }
3871
3872 static int kvm_write_guest_virt_system(struct x86_emulate_ctxt *ctxt,
3873                                        gva_t addr, void *val,
3874                                        unsigned int bytes,
3875                                        struct x86_exception *exception)
3876 {
3877         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
3878         void *data = val;
3879         int r = X86EMUL_CONTINUE;
3880
3881         while (bytes) {
3882                 gpa_t gpa =  vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr,
3883                                                              PFERR_WRITE_MASK,
3884                                                              exception);
3885                 unsigned offset = addr & (PAGE_SIZE-1);
3886                 unsigned towrite = min(bytes, (unsigned)PAGE_SIZE - offset);
3887                 int ret;
3888
3889                 if (gpa == UNMAPPED_GVA)
3890                         return X86EMUL_PROPAGATE_FAULT;
3891                 ret = kvm_write_guest(vcpu->kvm, gpa, data, towrite);
3892                 if (ret < 0) {
3893                         r = X86EMUL_IO_NEEDED;
3894                         goto out;
3895                 }
3896
3897                 bytes -= towrite;
3898                 data += towrite;
3899                 addr += towrite;
3900         }
3901 out:
3902         return r;
3903 }
3904
3905 static int emulator_read_emulated(struct x86_emulate_ctxt *ctxt,
3906                                   unsigned long addr,
3907                                   void *val,
3908                                   unsigned int bytes,
3909                                   struct x86_exception *exception)
3910 {
3911         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
3912         gpa_t                 gpa;
3913         int handled;
3914
3915         if (vcpu->mmio_read_completed) {
3916                 memcpy(val, vcpu->mmio_data, bytes);
3917                 trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes,
3918                                vcpu->mmio_phys_addr, *(u64 *)val);
3919                 vcpu->mmio_read_completed = 0;
3920                 return X86EMUL_CONTINUE;
3921         }
3922
3923         gpa = kvm_mmu_gva_to_gpa_read(vcpu, addr, exception);
3924
3925         if (gpa == UNMAPPED_GVA)
3926                 return X86EMUL_PROPAGATE_FAULT;
3927
3928         /* For APIC access vmexit */
3929         if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
3930                 goto mmio;
3931
3932         if (kvm_read_guest_virt(ctxt, addr, val, bytes, exception)
3933             == X86EMUL_CONTINUE)
3934                 return X86EMUL_CONTINUE;
3935
3936 mmio:
3937         /*
3938          * Is this MMIO handled locally?
3939          */
3940         handled = vcpu_mmio_read(vcpu, gpa, bytes, val);
3941
3942         if (handled == bytes)
3943                 return X86EMUL_CONTINUE;
3944
3945         gpa += handled;
3946         bytes -= handled;
3947         val += handled;
3948
3949         trace_kvm_mmio(KVM_TRACE_MMIO_READ_UNSATISFIED, bytes, gpa, 0);
3950
3951         vcpu->mmio_needed = 1;
3952         vcpu->run->exit_reason = KVM_EXIT_MMIO;
3953         vcpu->run->mmio.phys_addr = vcpu->mmio_phys_addr = gpa;
3954         vcpu->mmio_size = bytes;
3955         vcpu->run->mmio.len = min(vcpu->mmio_size, 8);
3956         vcpu->run->mmio.is_write = vcpu->mmio_is_write = 0;
3957         vcpu->mmio_index = 0;
3958
3959         return X86EMUL_IO_NEEDED;
3960 }
3961
3962 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
3963                         const void *val, int bytes)
3964 {
3965         int ret;
3966
3967         ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
3968         if (ret < 0)
3969                 return 0;
3970         kvm_mmu_pte_write(vcpu, gpa, val, bytes, 1);
3971         return 1;
3972 }
3973
3974 static int emulator_write_emulated_onepage(unsigned long addr,
3975                                            const void *val,
3976                                            unsigned int bytes,
3977                                            struct x86_exception *exception,
3978                                            struct kvm_vcpu *vcpu)
3979 {
3980         gpa_t                 gpa;
3981         int handled;
3982
3983         gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, exception);
3984
3985         if (gpa == UNMAPPED_GVA)
3986                 return X86EMUL_PROPAGATE_FAULT;
3987
3988         /* For APIC access vmexit */
3989         if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
3990                 goto mmio;
3991
3992         if (emulator_write_phys(vcpu, gpa, val, bytes))
3993                 return X86EMUL_CONTINUE;
3994
3995 mmio:
3996         trace_kvm_mmio(KVM_TRACE_MMIO_WRITE, bytes, gpa, *(u64 *)val);
3997         /*
3998          * Is this MMIO handled locally?
3999          */
4000         handled = vcpu_mmio_write(vcpu, gpa, bytes, val);
4001         if (handled == bytes)
4002                 return X86EMUL_CONTINUE;
4003
4004         gpa += handled;
4005         bytes -= handled;
4006         val += handled;
4007
4008         vcpu->mmio_needed = 1;
4009         memcpy(vcpu->mmio_data, val, bytes);
4010         vcpu->run->exit_reason = KVM_EXIT_MMIO;
4011         vcpu->run->mmio.phys_addr = vcpu->mmio_phys_addr = gpa;
4012         vcpu->mmio_size = bytes;
4013         vcpu->run->mmio.len = min(vcpu->mmio_size, 8);
4014         vcpu->run->mmio.is_write = vcpu->mmio_is_write = 1;
4015         memcpy(vcpu->run->mmio.data, vcpu->mmio_data, 8);
4016         vcpu->mmio_index = 0;
4017
4018         return X86EMUL_CONTINUE;
4019 }
4020
4021 int emulator_write_emulated(struct x86_emulate_ctxt *ctxt,
4022                             unsigned long addr,
4023                             const void *val,
4024                             unsigned int bytes,
4025                             struct x86_exception *exception)
4026 {
4027         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4028
4029         /* Crossing a page boundary? */
4030         if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
4031                 int rc, now;
4032
4033                 now = -addr & ~PAGE_MASK;
4034                 rc = emulator_write_emulated_onepage(addr, val, now, exception,
4035                                                      vcpu);
4036                 if (rc != X86EMUL_CONTINUE)
4037                         return rc;
4038                 addr += now;
4039                 val += now;
4040                 bytes -= now;
4041         }
4042         return emulator_write_emulated_onepage(addr, val, bytes, exception,
4043                                                vcpu);
4044 }
4045
4046 #define CMPXCHG_TYPE(t, ptr, old, new) \
4047         (cmpxchg((t *)(ptr), *(t *)(old), *(t *)(new)) == *(t *)(old))
4048
4049 #ifdef CONFIG_X86_64
4050 #  define CMPXCHG64(ptr, old, new) CMPXCHG_TYPE(u64, ptr, old, new)
4051 #else
4052 #  define CMPXCHG64(ptr, old, new) \
4053         (cmpxchg64((u64 *)(ptr), *(u64 *)(old), *(u64 *)(new)) == *(u64 *)(old))
4054 #endif
4055
4056 static int emulator_cmpxchg_emulated(struct x86_emulate_ctxt *ctxt,
4057                                      unsigned long addr,
4058                                      const void *old,
4059                                      const void *new,
4060                                      unsigned int bytes,
4061                                      struct x86_exception *exception)
4062 {
4063         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4064         gpa_t gpa;
4065         struct page *page;
4066         char *kaddr;
4067         bool exchanged;
4068
4069         /* guests cmpxchg8b have to be emulated atomically */
4070         if (bytes > 8 || (bytes & (bytes - 1)))
4071                 goto emul_write;
4072
4073         gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, NULL);
4074
4075         if (gpa == UNMAPPED_GVA ||
4076             (gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
4077                 goto emul_write;
4078
4079         if (((gpa + bytes - 1) & PAGE_MASK) != (gpa & PAGE_MASK))
4080                 goto emul_write;
4081
4082         page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
4083         if (is_error_page(page)) {
4084                 kvm_release_page_clean(page);
4085                 goto emul_write;
4086         }
4087
4088         kaddr = kmap_atomic(page, KM_USER0);
4089         kaddr += offset_in_page(gpa);
4090         switch (bytes) {
4091         case 1:
4092                 exchanged = CMPXCHG_TYPE(u8, kaddr, old, new);
4093                 break;
4094         case 2:
4095                 exchanged = CMPXCHG_TYPE(u16, kaddr, old, new);
4096                 break;
4097         case 4:
4098                 exchanged = CMPXCHG_TYPE(u32, kaddr, old, new);
4099                 break;
4100         case 8:
4101                 exchanged = CMPXCHG64(kaddr, old, new);
4102                 break;
4103         default:
4104                 BUG();
4105         }
4106         kunmap_atomic(kaddr, KM_USER0);
4107         kvm_release_page_dirty(page);
4108
4109         if (!exchanged)
4110                 return X86EMUL_CMPXCHG_FAILED;
4111
4112         kvm_mmu_pte_write(vcpu, gpa, new, bytes, 1);
4113
4114         return X86EMUL_CONTINUE;
4115
4116 emul_write:
4117         printk_once(KERN_WARNING "kvm: emulating exchange as write\n");
4118
4119         return emulator_write_emulated(ctxt, addr, new, bytes, exception);
4120 }
4121
4122 static int kernel_pio(struct kvm_vcpu *vcpu, void *pd)
4123 {
4124         /* TODO: String I/O for in kernel device */
4125         int r;
4126
4127         if (vcpu->arch.pio.in)
4128                 r = kvm_io_bus_read(vcpu->kvm, KVM_PIO_BUS, vcpu->arch.pio.port,
4129                                     vcpu->arch.pio.size, pd);
4130         else
4131                 r = kvm_io_bus_write(vcpu->kvm, KVM_PIO_BUS,
4132                                      vcpu->arch.pio.port, vcpu->arch.pio.size,
4133                                      pd);
4134         return r;
4135 }
4136
4137
4138 static int emulator_pio_in_emulated(struct x86_emulate_ctxt *ctxt,
4139                                     int size, unsigned short port, void *val,
4140                                     unsigned int count)
4141 {
4142         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4143
4144         if (vcpu->arch.pio.count)
4145                 goto data_avail;
4146
4147         trace_kvm_pio(0, port, size, count);
4148
4149         vcpu->arch.pio.port = port;
4150         vcpu->arch.pio.in = 1;
4151         vcpu->arch.pio.count  = count;
4152         vcpu->arch.pio.size = size;
4153
4154         if (!kernel_pio(vcpu, vcpu->arch.pio_data)) {
4155         data_avail:
4156                 memcpy(val, vcpu->arch.pio_data, size * count);
4157                 vcpu->arch.pio.count = 0;
4158                 return 1;
4159         }
4160
4161         vcpu->run->exit_reason = KVM_EXIT_IO;
4162         vcpu->run->io.direction = KVM_EXIT_IO_IN;
4163         vcpu->run->io.size = size;
4164         vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
4165         vcpu->run->io.count = count;
4166         vcpu->run->io.port = port;
4167
4168         return 0;
4169 }
4170
4171 static int emulator_pio_out_emulated(struct x86_emulate_ctxt *ctxt,
4172                                      int size, unsigned short port,
4173                                      const void *val, unsigned int count)
4174 {
4175         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4176
4177         trace_kvm_pio(1, port, size, count);
4178
4179         vcpu->arch.pio.port = port;
4180         vcpu->arch.pio.in = 0;
4181         vcpu->arch.pio.count = count;
4182         vcpu->arch.pio.size = size;
4183
4184         memcpy(vcpu->arch.pio_data, val, size * count);
4185
4186         if (!kernel_pio(vcpu, vcpu->arch.pio_data)) {
4187                 vcpu->arch.pio.count = 0;
4188                 return 1;
4189         }
4190
4191         vcpu->run->exit_reason = KVM_EXIT_IO;
4192         vcpu->run->io.direction = KVM_EXIT_IO_OUT;
4193         vcpu->run->io.size = size;
4194         vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
4195         vcpu->run->io.count = count;
4196         vcpu->run->io.port = port;
4197
4198         return 0;
4199 }
4200
4201 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
4202 {
4203         return kvm_x86_ops->get_segment_base(vcpu, seg);
4204 }
4205
4206 static void emulator_invlpg(struct x86_emulate_ctxt *ctxt, ulong address)
4207 {
4208         kvm_mmu_invlpg(emul_to_vcpu(ctxt), address);
4209 }
4210
4211 int kvm_emulate_wbinvd(struct kvm_vcpu *vcpu)
4212 {
4213         if (!need_emulate_wbinvd(vcpu))
4214                 return X86EMUL_CONTINUE;
4215
4216         if (kvm_x86_ops->has_wbinvd_exit()) {
4217                 int cpu = get_cpu();
4218
4219                 cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask);
4220                 smp_call_function_many(vcpu->arch.wbinvd_dirty_mask,
4221                                 wbinvd_ipi, NULL, 1);
4222                 put_cpu();
4223                 cpumask_clear(vcpu->arch.wbinvd_dirty_mask);
4224         } else
4225                 wbinvd();
4226         return X86EMUL_CONTINUE;
4227 }
4228 EXPORT_SYMBOL_GPL(kvm_emulate_wbinvd);
4229
4230 static void emulator_wbinvd(struct x86_emulate_ctxt *ctxt)
4231 {
4232         kvm_emulate_wbinvd(emul_to_vcpu(ctxt));
4233 }
4234
4235 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest)
4236 {
4237         return _kvm_get_dr(emul_to_vcpu(ctxt), dr, dest);
4238 }
4239
4240 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
4241 {
4242
4243         return __kvm_set_dr(emul_to_vcpu(ctxt), dr, value);
4244 }
4245
4246 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
4247 {
4248         return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
4249 }
4250
4251 static unsigned long emulator_get_cr(struct x86_emulate_ctxt *ctxt, int cr)
4252 {
4253         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4254         unsigned long value;
4255
4256         switch (cr) {
4257         case 0:
4258                 value = kvm_read_cr0(vcpu);
4259                 break;
4260         case 2:
4261                 value = vcpu->arch.cr2;
4262                 break;
4263         case 3:
4264                 value = kvm_read_cr3(vcpu);
4265                 break;
4266         case 4:
4267                 value = kvm_read_cr4(vcpu);
4268                 break;
4269         case 8:
4270                 value = kvm_get_cr8(vcpu);
4271                 break;
4272         default:
4273                 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr);
4274                 return 0;
4275         }
4276
4277         return value;
4278 }
4279
4280 static int emulator_set_cr(struct x86_emulate_ctxt *ctxt, int cr, ulong val)
4281 {
4282         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4283         int res = 0;
4284
4285         switch (cr) {
4286         case 0:
4287                 res = kvm_set_cr0(vcpu, mk_cr_64(kvm_read_cr0(vcpu), val));
4288                 break;
4289         case 2:
4290                 vcpu->arch.cr2 = val;
4291                 break;
4292         case 3:
4293                 res = kvm_set_cr3(vcpu, val);
4294                 break;
4295         case 4:
4296                 res = kvm_set_cr4(vcpu, mk_cr_64(kvm_read_cr4(vcpu), val));
4297                 break;
4298         case 8:
4299                 res = kvm_set_cr8(vcpu, val);
4300                 break;
4301         default:
4302                 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr);
4303                 res = -1;
4304         }
4305
4306         return res;
4307 }
4308
4309 static int emulator_get_cpl(struct x86_emulate_ctxt *ctxt)
4310 {
4311         return kvm_x86_ops->get_cpl(emul_to_vcpu(ctxt));
4312 }
4313
4314 static void emulator_get_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
4315 {
4316         kvm_x86_ops->get_gdt(emul_to_vcpu(ctxt), dt);
4317 }
4318
4319 static void emulator_get_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
4320 {
4321         kvm_x86_ops->get_idt(emul_to_vcpu(ctxt), dt);
4322 }
4323
4324 static void emulator_set_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
4325 {
4326         kvm_x86_ops->set_gdt(emul_to_vcpu(ctxt), dt);
4327 }
4328
4329 static void emulator_set_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
4330 {
4331         kvm_x86_ops->set_idt(emul_to_vcpu(ctxt), dt);
4332 }
4333
4334 static unsigned long emulator_get_cached_segment_base(
4335         struct x86_emulate_ctxt *ctxt, int seg)
4336 {
4337         return get_segment_base(emul_to_vcpu(ctxt), seg);
4338 }
4339
4340 static bool emulator_get_segment(struct x86_emulate_ctxt *ctxt, u16 *selector,
4341                                  struct desc_struct *desc, u32 *base3,
4342                                  int seg)
4343 {
4344         struct kvm_segment var;
4345
4346         kvm_get_segment(emul_to_vcpu(ctxt), &var, seg);
4347         *selector = var.selector;
4348
4349         if (var.unusable)
4350                 return false;
4351
4352         if (var.g)
4353                 var.limit >>= 12;
4354         set_desc_limit(desc, var.limit);
4355         set_desc_base(desc, (unsigned long)var.base);
4356 #ifdef CONFIG_X86_64
4357         if (base3)
4358                 *base3 = var.base >> 32;
4359 #endif
4360         desc->type = var.type;
4361         desc->s = var.s;
4362         desc->dpl = var.dpl;
4363         desc->p = var.present;
4364         desc->avl = var.avl;
4365         desc->l = var.l;
4366         desc->d = var.db;
4367         desc->g = var.g;
4368
4369         return true;
4370 }
4371
4372 static void emulator_set_segment(struct x86_emulate_ctxt *ctxt, u16 selector,
4373                                  struct desc_struct *desc, u32 base3,
4374                                  int seg)
4375 {
4376         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4377         struct kvm_segment var;
4378
4379         var.selector = selector;
4380         var.base = get_desc_base(desc);
4381 #ifdef CONFIG_X86_64
4382         var.base |= ((u64)base3) << 32;
4383 #endif
4384         var.limit = get_desc_limit(desc);
4385         if (desc->g)
4386                 var.limit = (var.limit << 12) | 0xfff;
4387         var.type = desc->type;
4388         var.present = desc->p;
4389         var.dpl = desc->dpl;
4390         var.db = desc->d;
4391         var.s = desc->s;
4392         var.l = desc->l;
4393         var.g = desc->g;
4394         var.avl = desc->avl;
4395         var.present = desc->p;
4396         var.unusable = !var.present;
4397         var.padding = 0;
4398
4399         kvm_set_segment(vcpu, &var, seg);
4400         return;
4401 }
4402
4403 static int emulator_get_msr(struct x86_emulate_ctxt *ctxt,
4404                             u32 msr_index, u64 *pdata)
4405 {
4406         return kvm_get_msr(emul_to_vcpu(ctxt), msr_index, pdata);
4407 }
4408
4409 static int emulator_set_msr(struct x86_emulate_ctxt *ctxt,
4410                             u32 msr_index, u64 data)
4411 {
4412         return kvm_set_msr(emul_to_vcpu(ctxt), msr_index, data);
4413 }
4414
4415 static void emulator_halt(struct x86_emulate_ctxt *ctxt)
4416 {
4417         emul_to_vcpu(ctxt)->arch.halt_request = 1;
4418 }
4419
4420 static void emulator_get_fpu(struct x86_emulate_ctxt *ctxt)
4421 {
4422         preempt_disable();
4423         kvm_load_guest_fpu(emul_to_vcpu(ctxt));
4424         /*
4425          * CR0.TS may reference the host fpu state, not the guest fpu state,
4426          * so it may be clear at this point.
4427          */
4428         clts();
4429 }
4430
4431 static void emulator_put_fpu(struct x86_emulate_ctxt *ctxt)
4432 {
4433         preempt_enable();
4434 }
4435
4436 static int emulator_intercept(struct x86_emulate_ctxt *ctxt,
4437                               struct x86_instruction_info *info,
4438                               enum x86_intercept_stage stage)
4439 {
4440         return kvm_x86_ops->check_intercept(emul_to_vcpu(ctxt), info, stage);
4441 }
4442
4443 static struct x86_emulate_ops emulate_ops = {
4444         .read_std            = kvm_read_guest_virt_system,
4445         .write_std           = kvm_write_guest_virt_system,
4446         .fetch               = kvm_fetch_guest_virt,
4447         .read_emulated       = emulator_read_emulated,
4448         .write_emulated      = emulator_write_emulated,
4449         .cmpxchg_emulated    = emulator_cmpxchg_emulated,
4450         .invlpg              = emulator_invlpg,
4451         .pio_in_emulated     = emulator_pio_in_emulated,
4452         .pio_out_emulated    = emulator_pio_out_emulated,
4453         .get_segment         = emulator_get_segment,
4454         .set_segment         = emulator_set_segment,
4455         .get_cached_segment_base = emulator_get_cached_segment_base,
4456         .get_gdt             = emulator_get_gdt,
4457         .get_idt             = emulator_get_idt,
4458         .set_gdt             = emulator_set_gdt,
4459         .set_idt             = emulator_set_idt,
4460         .get_cr              = emulator_get_cr,
4461         .set_cr              = emulator_set_cr,
4462         .cpl                 = emulator_get_cpl,
4463         .get_dr              = emulator_get_dr,
4464         .set_dr              = emulator_set_dr,
4465         .set_msr             = emulator_set_msr,
4466         .get_msr             = emulator_get_msr,
4467         .halt                = emulator_halt,
4468         .wbinvd              = emulator_wbinvd,
4469         .fix_hypercall       = emulator_fix_hypercall,
4470         .get_fpu             = emulator_get_fpu,
4471         .put_fpu             = emulator_put_fpu,
4472         .intercept           = emulator_intercept,
4473 };
4474
4475 static void cache_all_regs(struct kvm_vcpu *vcpu)
4476 {
4477         kvm_register_read(vcpu, VCPU_REGS_RAX);
4478         kvm_register_read(vcpu, VCPU_REGS_RSP);
4479         kvm_register_read(vcpu, VCPU_REGS_RIP);
4480         vcpu->arch.regs_dirty = ~0;
4481 }
4482
4483 static void toggle_interruptibility(struct kvm_vcpu *vcpu, u32 mask)
4484 {
4485         u32 int_shadow = kvm_x86_ops->get_interrupt_shadow(vcpu, mask);
4486         /*
4487          * an sti; sti; sequence only disable interrupts for the first
4488          * instruction. So, if the last instruction, be it emulated or
4489          * not, left the system with the INT_STI flag enabled, it
4490          * means that the last instruction is an sti. We should not
4491          * leave the flag on in this case. The same goes for mov ss
4492          */
4493         if (!(int_shadow & mask))
4494                 kvm_x86_ops->set_interrupt_shadow(vcpu, mask);
4495 }
4496
4497 static void inject_emulated_exception(struct kvm_vcpu *vcpu)
4498 {
4499         struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
4500         if (ctxt->exception.vector == PF_VECTOR)
4501                 kvm_propagate_fault(vcpu, &ctxt->exception);
4502         else if (ctxt->exception.error_code_valid)
4503                 kvm_queue_exception_e(vcpu, ctxt->exception.vector,
4504                                       ctxt->exception.error_code);
4505         else
4506                 kvm_queue_exception(vcpu, ctxt->exception.vector);
4507 }
4508
4509 static void init_emulate_ctxt(struct kvm_vcpu *vcpu)
4510 {
4511         struct decode_cache *c = &vcpu->arch.emulate_ctxt.decode;
4512         int cs_db, cs_l;
4513
4514         /*
4515          * TODO: fix emulate.c to use guest_read/write_register
4516          * instead of direct ->regs accesses, can save hundred cycles
4517          * on Intel for instructions that don't read/change RSP, for
4518          * for example.
4519          */
4520         cache_all_regs(vcpu);
4521
4522         kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
4523
4524         vcpu->arch.emulate_ctxt.eflags = kvm_get_rflags(vcpu);
4525         vcpu->arch.emulate_ctxt.eip = kvm_rip_read(vcpu);
4526         vcpu->arch.emulate_ctxt.mode =
4527                 (!is_protmode(vcpu)) ? X86EMUL_MODE_REAL :
4528                 (vcpu->arch.emulate_ctxt.eflags & X86_EFLAGS_VM)
4529                 ? X86EMUL_MODE_VM86 : cs_l
4530                 ? X86EMUL_MODE_PROT64 : cs_db
4531                 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
4532         vcpu->arch.emulate_ctxt.guest_mode = is_guest_mode(vcpu);
4533         memset(c, 0, sizeof(struct decode_cache));
4534         memcpy(c->regs, vcpu->arch.regs, sizeof c->regs);
4535         vcpu->arch.emulate_regs_need_sync_from_vcpu = false;
4536 }
4537
4538 int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip)
4539 {
4540         struct decode_cache *c = &vcpu->arch.emulate_ctxt.decode;
4541         int ret;
4542
4543         init_emulate_ctxt(vcpu);
4544
4545         vcpu->arch.emulate_ctxt.decode.op_bytes = 2;
4546         vcpu->arch.emulate_ctxt.decode.ad_bytes = 2;
4547         vcpu->arch.emulate_ctxt.decode.eip = vcpu->arch.emulate_ctxt.eip +
4548                                                                  inc_eip;
4549         ret = emulate_int_real(&vcpu->arch.emulate_ctxt, irq);
4550
4551         if (ret != X86EMUL_CONTINUE)
4552                 return EMULATE_FAIL;
4553
4554         vcpu->arch.emulate_ctxt.eip = c->eip;
4555         memcpy(vcpu->arch.regs, c->regs, sizeof c->regs);
4556         kvm_rip_write(vcpu, vcpu->arch.emulate_ctxt.eip);
4557         kvm_set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);
4558
4559         if (irq == NMI_VECTOR)
4560                 vcpu->arch.nmi_pending = false;
4561         else
4562                 vcpu->arch.interrupt.pending = false;
4563
4564         return EMULATE_DONE;
4565 }
4566 EXPORT_SYMBOL_GPL(kvm_inject_realmode_interrupt);
4567
4568 static int handle_emulation_failure(struct kvm_vcpu *vcpu)
4569 {
4570         int r = EMULATE_DONE;
4571
4572         ++vcpu->stat.insn_emulation_fail;
4573         trace_kvm_emulate_insn_failed(vcpu);
4574         if (!is_guest_mode(vcpu)) {
4575                 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
4576                 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
4577                 vcpu->run->internal.ndata = 0;
4578                 r = EMULATE_FAIL;
4579         }
4580         kvm_queue_exception(vcpu, UD_VECTOR);
4581
4582         return r;
4583 }
4584
4585 static bool reexecute_instruction(struct kvm_vcpu *vcpu, gva_t gva)
4586 {
4587         gpa_t gpa;
4588
4589         if (tdp_enabled)
4590                 return false;
4591
4592         /*
4593          * if emulation was due to access to shadowed page table
4594          * and it failed try to unshadow page and re-entetr the
4595          * guest to let CPU execute the instruction.
4596          */
4597         if (kvm_mmu_unprotect_page_virt(vcpu, gva))
4598                 return true;
4599
4600         gpa = kvm_mmu_gva_to_gpa_system(vcpu, gva, NULL);
4601
4602         if (gpa == UNMAPPED_GVA)
4603                 return true; /* let cpu generate fault */
4604
4605         if (!kvm_is_error_hva(gfn_to_hva(vcpu->kvm, gpa >> PAGE_SHIFT)))
4606                 return true;
4607
4608         return false;
4609 }
4610
4611 int x86_emulate_instruction(struct kvm_vcpu *vcpu,
4612                             unsigned long cr2,
4613                             int emulation_type,
4614                             void *insn,
4615                             int insn_len)
4616 {
4617         int r;
4618         struct decode_cache *c = &vcpu->arch.emulate_ctxt.decode;
4619         bool writeback = true;
4620
4621         kvm_clear_exception_queue(vcpu);
4622
4623         if (!(emulation_type & EMULTYPE_NO_DECODE)) {
4624                 init_emulate_ctxt(vcpu);
4625                 vcpu->arch.emulate_ctxt.interruptibility = 0;
4626                 vcpu->arch.emulate_ctxt.have_exception = false;
4627                 vcpu->arch.emulate_ctxt.perm_ok = false;
4628
4629                 vcpu->arch.emulate_ctxt.only_vendor_specific_insn
4630                         = emulation_type & EMULTYPE_TRAP_UD;
4631
4632                 r = x86_decode_insn(&vcpu->arch.emulate_ctxt, insn, insn_len);
4633
4634                 trace_kvm_emulate_insn_start(vcpu);
4635                 ++vcpu->stat.insn_emulation;
4636                 if (r)  {
4637                         if (emulation_type & EMULTYPE_TRAP_UD)
4638                                 return EMULATE_FAIL;
4639                         if (reexecute_instruction(vcpu, cr2))
4640                                 return EMULATE_DONE;
4641                         if (emulation_type & EMULTYPE_SKIP)
4642                                 return EMULATE_FAIL;
4643                         return handle_emulation_failure(vcpu);
4644                 }
4645         }
4646
4647         if (emulation_type & EMULTYPE_SKIP) {
4648                 kvm_rip_write(vcpu, vcpu->arch.emulate_ctxt.decode.eip);
4649                 return EMULATE_DONE;
4650         }
4651
4652         /* this is needed for vmware backdoor interface to work since it
4653            changes registers values  during IO operation */
4654         if (vcpu->arch.emulate_regs_need_sync_from_vcpu) {
4655                 vcpu->arch.emulate_regs_need_sync_from_vcpu = false;
4656                 memcpy(c->regs, vcpu->arch.regs, sizeof c->regs);
4657         }
4658
4659 restart:
4660         r = x86_emulate_insn(&vcpu->arch.emulate_ctxt);
4661
4662         if (r == EMULATION_INTERCEPTED)
4663                 return EMULATE_DONE;
4664
4665         if (r == EMULATION_FAILED) {
4666                 if (reexecute_instruction(vcpu, cr2))
4667                         return EMULATE_DONE;
4668
4669                 return handle_emulation_failure(vcpu);
4670         }
4671
4672         if (vcpu->arch.emulate_ctxt.have_exception) {
4673                 inject_emulated_exception(vcpu);
4674                 r = EMULATE_DONE;
4675         } else if (vcpu->arch.pio.count) {
4676                 if (!vcpu->arch.pio.in)
4677                         vcpu->arch.pio.count = 0;
4678                 else
4679                         writeback = false;
4680                 r = EMULATE_DO_MMIO;
4681         } else if (vcpu->mmio_needed) {
4682                 if (!vcpu->mmio_is_write)
4683                         writeback = false;
4684                 r = EMULATE_DO_MMIO;
4685         } else if (r == EMULATION_RESTART)
4686                 goto restart;
4687         else
4688                 r = EMULATE_DONE;
4689
4690         if (writeback) {
4691                 toggle_interruptibility(vcpu,
4692                                 vcpu->arch.emulate_ctxt.interruptibility);
4693                 kvm_set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);
4694                 kvm_make_request(KVM_REQ_EVENT, vcpu);
4695                 memcpy(vcpu->arch.regs, c->regs, sizeof c->regs);
4696                 vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
4697                 kvm_rip_write(vcpu, vcpu->arch.emulate_ctxt.eip);
4698         } else
4699                 vcpu->arch.emulate_regs_need_sync_to_vcpu = true;
4700
4701         return r;
4702 }
4703 EXPORT_SYMBOL_GPL(x86_emulate_instruction);
4704
4705 int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size, unsigned short port)
4706 {
4707         unsigned long val = kvm_register_read(vcpu, VCPU_REGS_RAX);
4708         int ret = emulator_pio_out_emulated(&vcpu->arch.emulate_ctxt,
4709                                             size, port, &val, 1);
4710         /* do not return to emulator after return from userspace */
4711         vcpu->arch.pio.count = 0;
4712         return ret;
4713 }
4714 EXPORT_SYMBOL_GPL(kvm_fast_pio_out);
4715
4716 static void tsc_bad(void *info)
4717 {
4718         __this_cpu_write(cpu_tsc_khz, 0);
4719 }
4720
4721 static void tsc_khz_changed(void *data)
4722 {
4723         struct cpufreq_freqs *freq = data;
4724         unsigned long khz = 0;
4725
4726         if (data)
4727                 khz = freq->new;
4728         else if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
4729                 khz = cpufreq_quick_get(raw_smp_processor_id());
4730         if (!khz)
4731                 khz = tsc_khz;
4732         __this_cpu_write(cpu_tsc_khz, khz);
4733 }
4734
4735 static int kvmclock_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
4736                                      void *data)
4737 {
4738         struct cpufreq_freqs *freq = data;
4739         struct kvm *kvm;
4740         struct kvm_vcpu *vcpu;
4741         int i, send_ipi = 0;
4742
4743         /*
4744          * We allow guests to temporarily run on slowing clocks,
4745          * provided we notify them after, or to run on accelerating
4746          * clocks, provided we notify them before.  Thus time never
4747          * goes backwards.
4748          *
4749          * However, we have a problem.  We can't atomically update
4750          * the frequency of a given CPU from this function; it is
4751          * merely a notifier, which can be called from any CPU.
4752          * Changing the TSC frequency at arbitrary points in time
4753          * requires a recomputation of local variables related to
4754          * the TSC for each VCPU.  We must flag these local variables
4755          * to be updated and be sure the update takes place with the
4756          * new frequency before any guests proceed.
4757          *
4758          * Unfortunately, the combination of hotplug CPU and frequency
4759          * change creates an intractable locking scenario; the order
4760          * of when these callouts happen is undefined with respect to
4761          * CPU hotplug, and they can race with each other.  As such,
4762          * merely setting per_cpu(cpu_tsc_khz) = X during a hotadd is
4763          * undefined; you can actually have a CPU frequency change take
4764          * place in between the computation of X and the setting of the
4765          * variable.  To protect against this problem, all updates of
4766          * the per_cpu tsc_khz variable are done in an interrupt
4767          * protected IPI, and all callers wishing to update the value
4768          * must wait for a synchronous IPI to complete (which is trivial
4769          * if the caller is on the CPU already).  This establishes the
4770          * necessary total order on variable updates.
4771          *
4772          * Note that because a guest time update may take place
4773          * anytime after the setting of the VCPU's request bit, the
4774          * correct TSC value must be set before the request.  However,
4775          * to ensure the update actually makes it to any guest which
4776          * starts running in hardware virtualization between the set
4777          * and the acquisition of the spinlock, we must also ping the
4778          * CPU after setting the request bit.
4779          *
4780          */
4781
4782         if (val == CPUFREQ_PRECHANGE && freq->old > freq->new)
4783                 return 0;
4784         if (val == CPUFREQ_POSTCHANGE && freq->old < freq->new)
4785                 return 0;
4786
4787         smp_call_function_single(freq->cpu, tsc_khz_changed, freq, 1);
4788
4789         raw_spin_lock(&kvm_lock);
4790         list_for_each_entry(kvm, &vm_list, vm_list) {
4791                 kvm_for_each_vcpu(i, vcpu, kvm) {
4792                         if (vcpu->cpu != freq->cpu)
4793                                 continue;
4794                         kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
4795                         if (vcpu->cpu != smp_processor_id())
4796                                 send_ipi = 1;
4797                 }
4798         }
4799         raw_spin_unlock(&kvm_lock);
4800
4801         if (freq->old < freq->new && send_ipi) {
4802                 /*
4803                  * We upscale the frequency.  Must make the guest
4804                  * doesn't see old kvmclock values while running with
4805                  * the new frequency, otherwise we risk the guest sees
4806                  * time go backwards.
4807                  *
4808                  * In case we update the frequency for another cpu
4809                  * (which might be in guest context) send an interrupt
4810                  * to kick the cpu out of guest context.  Next time
4811                  * guest context is entered kvmclock will be updated,
4812                  * so the guest will not see stale values.
4813                  */
4814                 smp_call_function_single(freq->cpu, tsc_khz_changed, freq, 1);
4815         }
4816         return 0;
4817 }
4818
4819 static struct notifier_block kvmclock_cpufreq_notifier_block = {
4820         .notifier_call  = kvmclock_cpufreq_notifier
4821 };
4822
4823 static int kvmclock_cpu_notifier(struct notifier_block *nfb,
4824                                         unsigned long action, void *hcpu)
4825 {
4826         unsigned int cpu = (unsigned long)hcpu;
4827
4828         switch (action) {
4829                 case CPU_ONLINE:
4830                 case CPU_DOWN_FAILED:
4831                         smp_call_function_single(cpu, tsc_khz_changed, NULL, 1);
4832                         break;
4833                 case CPU_DOWN_PREPARE:
4834                         smp_call_function_single(cpu, tsc_bad, NULL, 1);
4835                         break;
4836         }
4837         return NOTIFY_OK;
4838 }
4839
4840 static struct notifier_block kvmclock_cpu_notifier_block = {
4841         .notifier_call  = kvmclock_cpu_notifier,
4842         .priority = -INT_MAX
4843 };
4844
4845 static void kvm_timer_init(void)
4846 {
4847         int cpu;
4848
4849         max_tsc_khz = tsc_khz;
4850         register_hotcpu_notifier(&kvmclock_cpu_notifier_block);
4851         if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) {
4852 #ifdef CONFIG_CPU_FREQ
4853                 struct cpufreq_policy policy;
4854                 memset(&policy, 0, sizeof(policy));
4855                 cpu = get_cpu();
4856                 cpufreq_get_policy(&policy, cpu);
4857                 if (policy.cpuinfo.max_freq)
4858                         max_tsc_khz = policy.cpuinfo.max_freq;
4859                 put_cpu();
4860 #endif
4861                 cpufreq_register_notifier(&kvmclock_cpufreq_notifier_block,
4862                                           CPUFREQ_TRANSITION_NOTIFIER);
4863         }
4864         pr_debug("kvm: max_tsc_khz = %ld\n", max_tsc_khz);
4865         for_each_online_cpu(cpu)
4866                 smp_call_function_single(cpu, tsc_khz_changed, NULL, 1);
4867 }
4868
4869 static DEFINE_PER_CPU(struct kvm_vcpu *, current_vcpu);
4870
4871 static int kvm_is_in_guest(void)
4872 {
4873         return percpu_read(current_vcpu) != NULL;
4874 }
4875
4876 static int kvm_is_user_mode(void)
4877 {
4878         int user_mode = 3;
4879
4880         if (percpu_read(current_vcpu))
4881                 user_mode = kvm_x86_ops->get_cpl(percpu_read(current_vcpu));
4882
4883         return user_mode != 0;
4884 }
4885
4886 static unsigned long kvm_get_guest_ip(void)
4887 {
4888         unsigned long ip = 0;
4889
4890         if (percpu_read(current_vcpu))
4891                 ip = kvm_rip_read(percpu_read(current_vcpu));
4892
4893         return ip;
4894 }
4895
4896 static struct perf_guest_info_callbacks kvm_guest_cbs = {
4897         .is_in_guest            = kvm_is_in_guest,
4898         .is_user_mode           = kvm_is_user_mode,
4899         .get_guest_ip           = kvm_get_guest_ip,
4900 };
4901
4902 void kvm_before_handle_nmi(struct kvm_vcpu *vcpu)
4903 {
4904         percpu_write(current_vcpu, vcpu);
4905 }
4906 EXPORT_SYMBOL_GPL(kvm_before_handle_nmi);
4907
4908 void kvm_after_handle_nmi(struct kvm_vcpu *vcpu)
4909 {
4910         percpu_write(current_vcpu, NULL);
4911 }
4912 EXPORT_SYMBOL_GPL(kvm_after_handle_nmi);
4913
4914 int kvm_arch_init(void *opaque)
4915 {
4916         int r;
4917         struct kvm_x86_ops *ops = (struct kvm_x86_ops *)opaque;
4918
4919         if (kvm_x86_ops) {
4920                 printk(KERN_ERR "kvm: already loaded the other module\n");
4921                 r = -EEXIST;
4922                 goto out;
4923         }
4924
4925         if (!ops->cpu_has_kvm_support()) {
4926                 printk(KERN_ERR "kvm: no hardware support\n");
4927                 r = -EOPNOTSUPP;
4928                 goto out;
4929         }
4930         if (ops->disabled_by_bios()) {
4931                 printk(KERN_ERR "kvm: disabled by bios\n");
4932                 r = -EOPNOTSUPP;
4933                 goto out;
4934         }
4935
4936         r = kvm_mmu_module_init();
4937         if (r)
4938                 goto out;
4939
4940         kvm_init_msr_list();
4941
4942         kvm_x86_ops = ops;
4943         kvm_mmu_set_nonpresent_ptes(0ull, 0ull);
4944         kvm_mmu_set_mask_ptes(PT_USER_MASK, PT_ACCESSED_MASK,
4945                         PT_DIRTY_MASK, PT64_NX_MASK, 0);
4946
4947         kvm_timer_init();
4948
4949         perf_register_guest_info_callbacks(&kvm_guest_cbs);
4950
4951         if (cpu_has_xsave)
4952                 host_xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
4953
4954         return 0;
4955
4956 out:
4957         return r;
4958 }
4959
4960 void kvm_arch_exit(void)
4961 {
4962         perf_unregister_guest_info_callbacks(&kvm_guest_cbs);
4963
4964         if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
4965                 cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block,
4966                                             CPUFREQ_TRANSITION_NOTIFIER);
4967         unregister_hotcpu_notifier(&kvmclock_cpu_notifier_block);
4968         kvm_x86_ops = NULL;
4969         kvm_mmu_module_exit();
4970 }
4971
4972 int kvm_emulate_halt(struct kvm_vcpu *vcpu)
4973 {
4974         ++vcpu->stat.halt_exits;
4975         if (irqchip_in_kernel(vcpu->kvm)) {
4976                 vcpu->arch.mp_state = KVM_MP_STATE_HALTED;
4977                 return 1;
4978         } else {
4979                 vcpu->run->exit_reason = KVM_EXIT_HLT;
4980                 return 0;
4981         }
4982 }
4983 EXPORT_SYMBOL_GPL(kvm_emulate_halt);
4984
4985 static inline gpa_t hc_gpa(struct kvm_vcpu *vcpu, unsigned long a0,
4986                            unsigned long a1)
4987 {
4988         if (is_long_mode(vcpu))
4989                 return a0;
4990         else
4991                 return a0 | ((gpa_t)a1 << 32);
4992 }
4993
4994 int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
4995 {
4996         u64 param, ingpa, outgpa, ret;
4997         uint16_t code, rep_idx, rep_cnt, res = HV_STATUS_SUCCESS, rep_done = 0;
4998         bool fast, longmode;
4999         int cs_db, cs_l;
5000
5001         /*
5002          * hypercall generates UD from non zero cpl and real mode
5003          * per HYPER-V spec
5004          */
5005         if (kvm_x86_ops->get_cpl(vcpu) != 0 || !is_protmode(vcpu)) {
5006                 kvm_queue_exception(vcpu, UD_VECTOR);
5007                 return 0;
5008         }
5009
5010         kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
5011         longmode = is_long_mode(vcpu) && cs_l == 1;
5012
5013         if (!longmode) {
5014                 param = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDX) << 32) |
5015                         (kvm_register_read(vcpu, VCPU_REGS_RAX) & 0xffffffff);
5016                 ingpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RBX) << 32) |
5017                         (kvm_register_read(vcpu, VCPU_REGS_RCX) & 0xffffffff);
5018                 outgpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDI) << 32) |
5019                         (kvm_register_read(vcpu, VCPU_REGS_RSI) & 0xffffffff);
5020         }
5021 #ifdef CONFIG_X86_64
5022         else {
5023                 param = kvm_register_read(vcpu, VCPU_REGS_RCX);
5024                 ingpa = kvm_register_read(vcpu, VCPU_REGS_RDX);
5025                 outgpa = kvm_register_read(vcpu, VCPU_REGS_R8);
5026         }
5027 #endif
5028
5029         code = param & 0xffff;
5030         fast = (param >> 16) & 0x1;
5031         rep_cnt = (param >> 32) & 0xfff;
5032         rep_idx = (param >> 48) & 0xfff;
5033
5034         trace_kvm_hv_hypercall(code, fast, rep_cnt, rep_idx, ingpa, outgpa);
5035
5036         switch (code) {
5037         case HV_X64_HV_NOTIFY_LONG_SPIN_WAIT:
5038                 kvm_vcpu_on_spin(vcpu);
5039                 break;
5040         default:
5041                 res = HV_STATUS_INVALID_HYPERCALL_CODE;
5042                 break;
5043         }
5044
5045         ret = res | (((u64)rep_done & 0xfff) << 32);
5046         if (longmode) {
5047                 kvm_register_write(vcpu, VCPU_REGS_RAX, ret);
5048         } else {
5049                 kvm_register_write(vcpu, VCPU_REGS_RDX, ret >> 32);
5050                 kvm_register_write(vcpu, VCPU_REGS_RAX, ret & 0xffffffff);
5051         }
5052
5053         return 1;
5054 }
5055
5056 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
5057 {
5058         unsigned long nr, a0, a1, a2, a3, ret;
5059         int r = 1;
5060
5061         if (kvm_hv_hypercall_enabled(vcpu->kvm))
5062                 return kvm_hv_hypercall(vcpu);
5063
5064         nr = kvm_register_read(vcpu, VCPU_REGS_RAX);
5065         a0 = kvm_register_read(vcpu, VCPU_REGS_RBX);
5066         a1 = kvm_register_read(vcpu, VCPU_REGS_RCX);
5067         a2 = kvm_register_read(vcpu, VCPU_REGS_RDX);
5068         a3 = kvm_register_read(vcpu, VCPU_REGS_RSI);
5069
5070         trace_kvm_hypercall(nr, a0, a1, a2, a3);
5071
5072         if (!is_long_mode(vcpu)) {
5073                 nr &= 0xFFFFFFFF;
5074                 a0 &= 0xFFFFFFFF;
5075                 a1 &= 0xFFFFFFFF;
5076                 a2 &= 0xFFFFFFFF;
5077                 a3 &= 0xFFFFFFFF;
5078         }
5079
5080         if (kvm_x86_ops->get_cpl(vcpu) != 0) {
5081                 ret = -KVM_EPERM;
5082                 goto out;
5083         }
5084
5085         switch (nr) {
5086         case KVM_HC_VAPIC_POLL_IRQ:
5087                 ret = 0;
5088                 break;
5089         case KVM_HC_MMU_OP:
5090                 r = kvm_pv_mmu_op(vcpu, a0, hc_gpa(vcpu, a1, a2), &ret);
5091                 break;
5092         default:
5093                 ret = -KVM_ENOSYS;
5094                 break;
5095         }
5096 out:
5097         kvm_register_write(vcpu, VCPU_REGS_RAX, ret);
5098         ++vcpu->stat.hypercalls;
5099         return r;
5100 }
5101 EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);
5102
5103 int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt)
5104 {
5105         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
5106         char instruction[3];
5107         unsigned long rip = kvm_rip_read(vcpu);
5108
5109         /*
5110          * Blow out the MMU to ensure that no other VCPU has an active mapping
5111          * to ensure that the updated hypercall appears atomically across all
5112          * VCPUs.
5113          */
5114         kvm_mmu_zap_all(vcpu->kvm);
5115
5116         kvm_x86_ops->patch_hypercall(vcpu, instruction);
5117
5118         return emulator_write_emulated(&vcpu->arch.emulate_ctxt,
5119                                        rip, instruction, 3, NULL);
5120 }
5121
5122 static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i)
5123 {
5124         struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i];
5125         int j, nent = vcpu->arch.cpuid_nent;
5126
5127         e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT;
5128         /* when no next entry is found, the current entry[i] is reselected */
5129         for (j = i + 1; ; j = (j + 1) % nent) {
5130                 struct kvm_cpuid_entry2 *ej = &vcpu->arch.cpuid_entries[j];
5131                 if (ej->function == e->function) {
5132                         ej->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
5133                         return j;
5134                 }
5135         }
5136         return 0; /* silence gcc, even though control never reaches here */
5137 }
5138
5139 /* find an entry with matching function, matching index (if needed), and that
5140  * should be read next (if it's stateful) */
5141 static int is_matching_cpuid_entry(struct kvm_cpuid_entry2 *e,
5142         u32 function, u32 index)
5143 {
5144         if (e->function != function)
5145                 return 0;
5146         if ((e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX) && e->index != index)
5147                 return 0;
5148         if ((e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) &&
5149             !(e->flags & KVM_CPUID_FLAG_STATE_READ_NEXT))
5150                 return 0;
5151         return 1;
5152 }
5153
5154 struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
5155                                               u32 function, u32 index)
5156 {
5157         int i;
5158         struct kvm_cpuid_entry2 *best = NULL;
5159
5160         for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
5161                 struct kvm_cpuid_entry2 *e;
5162
5163                 e = &vcpu->arch.cpuid_entries[i];
5164                 if (is_matching_cpuid_entry(e, function, index)) {
5165                         if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC)
5166                                 move_to_next_stateful_cpuid_entry(vcpu, i);
5167                         best = e;
5168                         break;
5169                 }
5170         }
5171         return best;
5172 }
5173 EXPORT_SYMBOL_GPL(kvm_find_cpuid_entry);
5174
5175 int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
5176 {
5177         struct kvm_cpuid_entry2 *best;
5178
5179         best = kvm_find_cpuid_entry(vcpu, 0x80000000, 0);
5180         if (!best || best->eax < 0x80000008)
5181                 goto not_found;
5182         best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0);
5183         if (best)
5184                 return best->eax & 0xff;
5185 not_found:
5186         return 36;
5187 }
5188
5189 /*
5190  * If no match is found, check whether we exceed the vCPU's limit
5191  * and return the content of the highest valid _standard_ leaf instead.
5192  * This is to satisfy the CPUID specification.
5193  */
5194 static struct kvm_cpuid_entry2* check_cpuid_limit(struct kvm_vcpu *vcpu,
5195                                                   u32 function, u32 index)
5196 {
5197         struct kvm_cpuid_entry2 *maxlevel;
5198
5199         maxlevel = kvm_find_cpuid_entry(vcpu, function & 0x80000000, 0);
5200         if (!maxlevel || maxlevel->eax >= function)
5201                 return NULL;
5202         if (function & 0x80000000) {
5203                 maxlevel = kvm_find_cpuid_entry(vcpu, 0, 0);
5204                 if (!maxlevel)
5205                         return NULL;
5206         }
5207         return kvm_find_cpuid_entry(vcpu, maxlevel->eax, index);
5208 }
5209
5210 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
5211 {
5212         u32 function, index;
5213         struct kvm_cpuid_entry2 *best;
5214
5215         function = kvm_register_read(vcpu, VCPU_REGS_RAX);
5216         index = kvm_register_read(vcpu, VCPU_REGS_RCX);
5217         kvm_register_write(vcpu, VCPU_REGS_RAX, 0);
5218         kvm_register_write(vcpu, VCPU_REGS_RBX, 0);
5219         kvm_register_write(vcpu, VCPU_REGS_RCX, 0);
5220         kvm_register_write(vcpu, VCPU_REGS_RDX, 0);
5221         best = kvm_find_cpuid_entry(vcpu, function, index);
5222
5223         if (!best)
5224                 best = check_cpuid_limit(vcpu, function, index);
5225
5226         if (best) {
5227                 kvm_register_write(vcpu, VCPU_REGS_RAX, best->eax);
5228                 kvm_register_write(vcpu, VCPU_REGS_RBX, best->ebx);
5229                 kvm_register_write(vcpu, VCPU_REGS_RCX, best->ecx);
5230                 kvm_register_write(vcpu, VCPU_REGS_RDX, best->edx);
5231         }
5232         kvm_x86_ops->skip_emulated_instruction(vcpu);
5233         trace_kvm_cpuid(function,
5234                         kvm_register_read(vcpu, VCPU_REGS_RAX),
5235                         kvm_register_read(vcpu, VCPU_REGS_RBX),
5236                         kvm_register_read(vcpu, VCPU_REGS_RCX),
5237                         kvm_register_read(vcpu, VCPU_REGS_RDX));
5238 }
5239 EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
5240
5241 /*
5242  * Check if userspace requested an interrupt window, and that the
5243  * interrupt window is open.
5244  *
5245  * No need to exit to userspace if we already have an interrupt queued.
5246  */
5247 static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu)
5248 {
5249         return (!irqchip_in_kernel(vcpu->kvm) && !kvm_cpu_has_interrupt(vcpu) &&
5250                 vcpu->run->request_interrupt_window &&
5251                 kvm_arch_interrupt_allowed(vcpu));
5252 }
5253
5254 static void post_kvm_run_save(struct kvm_vcpu *vcpu)
5255 {
5256         struct kvm_run *kvm_run = vcpu->run;
5257
5258         kvm_run->if_flag = (kvm_get_rflags(vcpu) & X86_EFLAGS_IF) != 0;
5259         kvm_run->cr8 = kvm_get_cr8(vcpu);
5260         kvm_run->apic_base = kvm_get_apic_base(vcpu);
5261         if (irqchip_in_kernel(vcpu->kvm))
5262                 kvm_run->ready_for_interrupt_injection = 1;
5263         else
5264                 kvm_run->ready_for_interrupt_injection =
5265                         kvm_arch_interrupt_allowed(vcpu) &&
5266                         !kvm_cpu_has_interrupt(vcpu) &&
5267                         !kvm_event_needs_reinjection(vcpu);
5268 }
5269
5270 static void vapic_enter(struct kvm_vcpu *vcpu)
5271 {
5272         struct kvm_lapic *apic = vcpu->arch.apic;
5273         struct page *page;
5274
5275         if (!apic || !apic->vapic_addr)
5276                 return;
5277
5278         page = gfn_to_page(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
5279
5280         vcpu->arch.apic->vapic_page = page;
5281 }
5282
5283 static void vapic_exit(struct kvm_vcpu *vcpu)
5284 {
5285         struct kvm_lapic *apic = vcpu->arch.apic;
5286         int idx;
5287
5288         if (!apic || !apic->vapic_addr)
5289                 return;
5290
5291         idx = srcu_read_lock(&vcpu->kvm->srcu);
5292         kvm_release_page_dirty(apic->vapic_page);
5293         mark_page_dirty(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
5294         srcu_read_unlock(&vcpu->kvm->srcu, idx);
5295 }
5296
5297 static void update_cr8_intercept(struct kvm_vcpu *vcpu)
5298 {
5299         int max_irr, tpr;
5300
5301         if (!kvm_x86_ops->update_cr8_intercept)
5302                 return;
5303
5304         if (!vcpu->arch.apic)
5305                 return;
5306
5307         if (!vcpu->arch.apic->vapic_addr)
5308                 max_irr = kvm_lapic_find_highest_irr(vcpu);
5309         else
5310                 max_irr = -1;
5311
5312         if (max_irr != -1)
5313                 max_irr >>= 4;
5314
5315         tpr = kvm_lapic_get_cr8(vcpu);
5316
5317         kvm_x86_ops->update_cr8_intercept(vcpu, tpr, max_irr);
5318 }
5319
5320 static void inject_pending_event(struct kvm_vcpu *vcpu)
5321 {
5322         /* try to reinject previous events if any */
5323         if (vcpu->arch.exception.pending) {
5324                 trace_kvm_inj_exception(vcpu->arch.exception.nr,
5325                                         vcpu->arch.exception.has_error_code,
5326                                         vcpu->arch.exception.error_code);
5327                 kvm_x86_ops->queue_exception(vcpu, vcpu->arch.exception.nr,
5328                                           vcpu->arch.exception.has_error_code,
5329                                           vcpu->arch.exception.error_code,
5330                                           vcpu->arch.exception.reinject);
5331                 return;
5332         }
5333
5334         if (vcpu->arch.nmi_injected) {
5335                 kvm_x86_ops->set_nmi(vcpu);
5336                 return;
5337         }
5338
5339         if (vcpu->arch.interrupt.pending) {
5340                 kvm_x86_ops->set_irq(vcpu);
5341                 return;
5342         }
5343
5344         /* try to inject new event if pending */
5345         if (vcpu->arch.nmi_pending) {
5346                 if (kvm_x86_ops->nmi_allowed(vcpu)) {
5347                         vcpu->arch.nmi_pending = false;
5348                         vcpu->arch.nmi_injected = true;
5349                         kvm_x86_ops->set_nmi(vcpu);
5350                 }
5351         } else if (kvm_cpu_has_interrupt(vcpu)) {
5352                 if (kvm_x86_ops->interrupt_allowed(vcpu)) {
5353                         kvm_queue_interrupt(vcpu, kvm_cpu_get_interrupt(vcpu),
5354                                             false);
5355                         kvm_x86_ops->set_irq(vcpu);
5356                 }
5357         }
5358 }
5359
5360 static void kvm_load_guest_xcr0(struct kvm_vcpu *vcpu)
5361 {
5362         if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE) &&
5363                         !vcpu->guest_xcr0_loaded) {
5364                 /* kvm_set_xcr() also depends on this */
5365                 xsetbv(XCR_XFEATURE_ENABLED_MASK, vcpu->arch.xcr0);
5366                 vcpu->guest_xcr0_loaded = 1;
5367         }
5368 }
5369
5370 static void kvm_put_guest_xcr0(struct kvm_vcpu *vcpu)
5371 {
5372         if (vcpu->guest_xcr0_loaded) {
5373                 if (vcpu->arch.xcr0 != host_xcr0)
5374                         xsetbv(XCR_XFEATURE_ENABLED_MASK, host_xcr0);
5375                 vcpu->guest_xcr0_loaded = 0;
5376         }
5377 }
5378
5379 static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
5380 {
5381         int r;
5382         bool nmi_pending;
5383         bool req_int_win = !irqchip_in_kernel(vcpu->kvm) &&
5384                 vcpu->run->request_interrupt_window;
5385
5386         if (vcpu->requests) {
5387                 if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu))
5388                         kvm_mmu_unload(vcpu);
5389                 if (kvm_check_request(KVM_REQ_MIGRATE_TIMER, vcpu))
5390                         __kvm_migrate_timers(vcpu);
5391                 if (kvm_check_request(KVM_REQ_CLOCK_UPDATE, vcpu)) {
5392                         r = kvm_guest_time_update(vcpu);
5393                         if (unlikely(r))
5394                                 goto out;
5395                 }
5396                 if (kvm_check_request(KVM_REQ_MMU_SYNC, vcpu))
5397                         kvm_mmu_sync_roots(vcpu);
5398                 if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu))
5399                         kvm_x86_ops->tlb_flush(vcpu);
5400                 if (kvm_check_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu)) {
5401                         vcpu->run->exit_reason = KVM_EXIT_TPR_ACCESS;
5402                         r = 0;
5403                         goto out;
5404                 }
5405                 if (kvm_check_request(KVM_REQ_TRIPLE_FAULT, vcpu)) {
5406                         vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN;
5407                         r = 0;
5408                         goto out;
5409                 }
5410                 if (kvm_check_request(KVM_REQ_DEACTIVATE_FPU, vcpu)) {
5411                         vcpu->fpu_active = 0;
5412                         kvm_x86_ops->fpu_deactivate(vcpu);
5413                 }
5414                 if (kvm_check_request(KVM_REQ_APF_HALT, vcpu)) {
5415                         /* Page is swapped out. Do synthetic halt */
5416                         vcpu->arch.apf.halted = true;
5417                         r = 1;
5418                         goto out;
5419                 }
5420         }
5421
5422         r = kvm_mmu_reload(vcpu);
5423         if (unlikely(r))
5424                 goto out;
5425
5426         /*
5427          * An NMI can be injected between local nmi_pending read and
5428          * vcpu->arch.nmi_pending read inside inject_pending_event().
5429          * But in that case, KVM_REQ_EVENT will be set, which makes
5430          * the race described above benign.
5431          */
5432         nmi_pending = ACCESS_ONCE(vcpu->arch.nmi_pending);
5433
5434         if (kvm_check_request(KVM_REQ_EVENT, vcpu) || req_int_win) {
5435                 inject_pending_event(vcpu);
5436
5437                 /* enable NMI/IRQ window open exits if needed */
5438                 if (nmi_pending)
5439                         kvm_x86_ops->enable_nmi_window(vcpu);
5440                 else if (kvm_cpu_has_interrupt(vcpu) || req_int_win)
5441                         kvm_x86_ops->enable_irq_window(vcpu);
5442
5443                 if (kvm_lapic_enabled(vcpu)) {
5444                         update_cr8_intercept(vcpu);
5445                         kvm_lapic_sync_to_vapic(vcpu);
5446                 }
5447         }
5448
5449         preempt_disable();
5450
5451         kvm_x86_ops->prepare_guest_switch(vcpu);
5452         if (vcpu->fpu_active)
5453                 kvm_load_guest_fpu(vcpu);
5454         kvm_load_guest_xcr0(vcpu);
5455
5456         vcpu->mode = IN_GUEST_MODE;
5457
5458         /* We should set ->mode before check ->requests,
5459          * see the comment in make_all_cpus_request.
5460          */
5461         smp_mb();
5462
5463         local_irq_disable();
5464
5465         if (vcpu->mode == EXITING_GUEST_MODE || vcpu->requests
5466             || need_resched() || signal_pending(current)) {
5467                 vcpu->mode = OUTSIDE_GUEST_MODE;
5468                 smp_wmb();
5469                 local_irq_enable();
5470                 preempt_enable();
5471                 kvm_x86_ops->cancel_injection(vcpu);
5472                 r = 1;
5473                 goto out;
5474         }
5475
5476         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
5477
5478         kvm_guest_enter();
5479
5480         if (unlikely(vcpu->arch.switch_db_regs)) {
5481                 set_debugreg(0, 7);
5482                 set_debugreg(vcpu->arch.eff_db[0], 0);
5483                 set_debugreg(vcpu->arch.eff_db[1], 1);
5484                 set_debugreg(vcpu->arch.eff_db[2], 2);
5485                 set_debugreg(vcpu->arch.eff_db[3], 3);
5486         }
5487
5488         trace_kvm_entry(vcpu->vcpu_id);
5489         kvm_x86_ops->run(vcpu);
5490
5491         /*
5492          * If the guest has used debug registers, at least dr7
5493          * will be disabled while returning to the host.
5494          * If we don't have active breakpoints in the host, we don't
5495          * care about the messed up debug address registers. But if
5496          * we have some of them active, restore the old state.
5497          */
5498         if (hw_breakpoint_active())
5499                 hw_breakpoint_restore();
5500
5501         kvm_get_msr(vcpu, MSR_IA32_TSC, &vcpu->arch.last_guest_tsc);
5502
5503         vcpu->mode = OUTSIDE_GUEST_MODE;
5504         smp_wmb();
5505         local_irq_enable();
5506
5507         ++vcpu->stat.exits;
5508
5509         /*
5510          * We must have an instruction between local_irq_enable() and
5511          * kvm_guest_exit(), so the timer interrupt isn't delayed by
5512          * the interrupt shadow.  The stat.exits increment will do nicely.
5513          * But we need to prevent reordering, hence this barrier():
5514          */
5515         barrier();
5516
5517         kvm_guest_exit();
5518
5519         preempt_enable();
5520
5521         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
5522
5523         /*
5524          * Profile KVM exit RIPs:
5525          */
5526         if (unlikely(prof_on == KVM_PROFILING)) {
5527                 unsigned long rip = kvm_rip_read(vcpu);
5528                 profile_hit(KVM_PROFILING, (void *)rip);
5529         }
5530
5531
5532         kvm_lapic_sync_from_vapic(vcpu);
5533
5534         r = kvm_x86_ops->handle_exit(vcpu);
5535 out:
5536         return r;
5537 }
5538
5539
5540 static int __vcpu_run(struct kvm_vcpu *vcpu)
5541 {
5542         int r;
5543         struct kvm *kvm = vcpu->kvm;
5544
5545         if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED)) {
5546                 pr_debug("vcpu %d received sipi with vector # %x\n",
5547                          vcpu->vcpu_id, vcpu->arch.sipi_vector);
5548                 kvm_lapic_reset(vcpu);
5549                 r = kvm_arch_vcpu_reset(vcpu);
5550                 if (r)
5551                         return r;
5552                 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
5553         }
5554
5555         vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
5556         vapic_enter(vcpu);
5557
5558         r = 1;
5559         while (r > 0) {
5560                 if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE &&
5561                     !vcpu->arch.apf.halted)
5562                         r = vcpu_enter_guest(vcpu);
5563                 else {
5564                         srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
5565                         kvm_vcpu_block(vcpu);
5566                         vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
5567                         if (kvm_check_request(KVM_REQ_UNHALT, vcpu))
5568                         {
5569                                 switch(vcpu->arch.mp_state) {
5570                                 case KVM_MP_STATE_HALTED:
5571                                         vcpu->arch.mp_state =
5572                                                 KVM_MP_STATE_RUNNABLE;
5573                                 case KVM_MP_STATE_RUNNABLE:
5574                                         vcpu->arch.apf.halted = false;
5575                                         break;
5576                                 case KVM_MP_STATE_SIPI_RECEIVED:
5577                                 default:
5578                                         r = -EINTR;
5579                                         break;
5580                                 }
5581                         }
5582                 }
5583
5584                 if (r <= 0)
5585                         break;
5586
5587                 clear_bit(KVM_REQ_PENDING_TIMER, &vcpu->requests);
5588                 if (kvm_cpu_has_pending_timer(vcpu))
5589                         kvm_inject_pending_timer_irqs(vcpu);
5590
5591                 if (dm_request_for_irq_injection(vcpu)) {
5592                         r = -EINTR;
5593                         vcpu->run->exit_reason = KVM_EXIT_INTR;
5594                         ++vcpu->stat.request_irq_exits;
5595                 }
5596
5597                 kvm_check_async_pf_completion(vcpu);
5598
5599                 if (signal_pending(current)) {
5600                         r = -EINTR;
5601                         vcpu->run->exit_reason = KVM_EXIT_INTR;
5602                         ++vcpu->stat.signal_exits;
5603                 }
5604                 if (need_resched()) {
5605                         srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
5606                         kvm_resched(vcpu);
5607                         vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
5608                 }
5609         }
5610
5611         srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
5612
5613         vapic_exit(vcpu);
5614
5615         return r;
5616 }
5617
5618 static int complete_mmio(struct kvm_vcpu *vcpu)
5619 {
5620         struct kvm_run *run = vcpu->run;
5621         int r;
5622
5623         if (!(vcpu->arch.pio.count || vcpu->mmio_needed))
5624                 return 1;
5625
5626         if (vcpu->mmio_needed) {
5627                 vcpu->mmio_needed = 0;
5628                 if (!vcpu->mmio_is_write)
5629                         memcpy(vcpu->mmio_data + vcpu->mmio_index,
5630                                run->mmio.data, 8);
5631                 vcpu->mmio_index += 8;
5632                 if (vcpu->mmio_index < vcpu->mmio_size) {
5633                         run->exit_reason = KVM_EXIT_MMIO;
5634                         run->mmio.phys_addr = vcpu->mmio_phys_addr + vcpu->mmio_index;
5635                         memcpy(run->mmio.data, vcpu->mmio_data + vcpu->mmio_index, 8);
5636                         run->mmio.len = min(vcpu->mmio_size - vcpu->mmio_index, 8);
5637                         run->mmio.is_write = vcpu->mmio_is_write;
5638                         vcpu->mmio_needed = 1;
5639                         return 0;
5640                 }
5641                 if (vcpu->mmio_is_write)
5642                         return 1;
5643                 vcpu->mmio_read_completed = 1;
5644         }
5645         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
5646         r = emulate_instruction(vcpu, EMULTYPE_NO_DECODE);
5647         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
5648         if (r != EMULATE_DONE)
5649                 return 0;
5650         return 1;
5651 }
5652
5653 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
5654 {
5655         int r;
5656         sigset_t sigsaved;
5657
5658         if (!tsk_used_math(current) && init_fpu(current))
5659                 return -ENOMEM;
5660
5661         if (vcpu->sigset_active)
5662                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
5663
5664         if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) {
5665                 kvm_vcpu_block(vcpu);
5666                 clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
5667                 r = -EAGAIN;
5668                 goto out;
5669         }
5670
5671         /* re-sync apic's tpr */
5672         if (!irqchip_in_kernel(vcpu->kvm)) {
5673                 if (kvm_set_cr8(vcpu, kvm_run->cr8) != 0) {
5674                         r = -EINVAL;
5675                         goto out;
5676                 }
5677         }
5678
5679         r = complete_mmio(vcpu);
5680         if (r <= 0)
5681                 goto out;
5682
5683         if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL)
5684                 kvm_register_write(vcpu, VCPU_REGS_RAX,
5685                                      kvm_run->hypercall.ret);
5686
5687         r = __vcpu_run(vcpu);
5688
5689 out:
5690         post_kvm_run_save(vcpu);
5691         if (vcpu->sigset_active)
5692                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
5693
5694         return r;
5695 }
5696
5697 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
5698 {
5699         if (vcpu->arch.emulate_regs_need_sync_to_vcpu) {
5700                 /*
5701                  * We are here if userspace calls get_regs() in the middle of
5702                  * instruction emulation. Registers state needs to be copied
5703                  * back from emulation context to vcpu. Usrapace shouldn't do
5704                  * that usually, but some bad designed PV devices (vmware
5705                  * backdoor interface) need this to work
5706                  */
5707                 struct decode_cache *c = &vcpu->arch.emulate_ctxt.decode;
5708                 memcpy(vcpu->arch.regs, c->regs, sizeof c->regs);
5709                 vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
5710         }
5711         regs->rax = kvm_register_read(vcpu, VCPU_REGS_RAX);
5712         regs->rbx = kvm_register_read(vcpu, VCPU_REGS_RBX);
5713         regs->rcx = kvm_register_read(vcpu, VCPU_REGS_RCX);
5714         regs->rdx = kvm_register_read(vcpu, VCPU_REGS_RDX);
5715         regs->rsi = kvm_register_read(vcpu, VCPU_REGS_RSI);
5716         regs->rdi = kvm_register_read(vcpu, VCPU_REGS_RDI);
5717         regs->rsp = kvm_register_read(vcpu, VCPU_REGS_RSP);
5718         regs->rbp = kvm_register_read(vcpu, VCPU_REGS_RBP);
5719 #ifdef CONFIG_X86_64
5720         regs->r8 = kvm_register_read(vcpu, VCPU_REGS_R8);
5721         regs->r9 = kvm_register_read(vcpu, VCPU_REGS_R9);
5722         regs->r10 = kvm_register_read(vcpu, VCPU_REGS_R10);
5723         regs->r11 = kvm_register_read(vcpu, VCPU_REGS_R11);
5724         regs->r12 = kvm_register_read(vcpu, VCPU_REGS_R12);
5725         regs->r13 = kvm_register_read(vcpu, VCPU_REGS_R13);
5726         regs->r14 = kvm_register_read(vcpu, VCPU_REGS_R14);
5727         regs->r15 = kvm_register_read(vcpu, VCPU_REGS_R15);
5728 #endif
5729
5730         regs->rip = kvm_rip_read(vcpu);
5731         regs->rflags = kvm_get_rflags(vcpu);
5732
5733         return 0;
5734 }
5735
5736 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
5737 {
5738         vcpu->arch.emulate_regs_need_sync_from_vcpu = true;
5739         vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
5740
5741         kvm_register_write(vcpu, VCPU_REGS_RAX, regs->rax);
5742         kvm_register_write(vcpu, VCPU_REGS_RBX, regs->rbx);
5743         kvm_register_write(vcpu, VCPU_REGS_RCX, regs->rcx);
5744         kvm_register_write(vcpu, VCPU_REGS_RDX, regs->rdx);
5745         kvm_register_write(vcpu, VCPU_REGS_RSI, regs->rsi);
5746         kvm_register_write(vcpu, VCPU_REGS_RDI, regs->rdi);
5747         kvm_register_write(vcpu, VCPU_REGS_RSP, regs->rsp);
5748         kvm_register_write(vcpu, VCPU_REGS_RBP, regs->rbp);
5749 #ifdef CONFIG_X86_64
5750         kvm_register_write(vcpu, VCPU_REGS_R8, regs->r8);
5751         kvm_register_write(vcpu, VCPU_REGS_R9, regs->r9);
5752         kvm_register_write(vcpu, VCPU_REGS_R10, regs->r10);
5753         kvm_register_write(vcpu, VCPU_REGS_R11, regs->r11);
5754         kvm_register_write(vcpu, VCPU_REGS_R12, regs->r12);
5755         kvm_register_write(vcpu, VCPU_REGS_R13, regs->r13);
5756         kvm_register_write(vcpu, VCPU_REGS_R14, regs->r14);
5757         kvm_register_write(vcpu, VCPU_REGS_R15, regs->r15);
5758 #endif
5759
5760         kvm_rip_write(vcpu, regs->rip);
5761         kvm_set_rflags(vcpu, regs->rflags);
5762
5763         vcpu->arch.exception.pending = false;
5764
5765         kvm_make_request(KVM_REQ_EVENT, vcpu);
5766
5767         return 0;
5768 }
5769
5770 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
5771 {
5772         struct kvm_segment cs;
5773
5774         kvm_get_segment(vcpu, &cs, VCPU_SREG_CS);
5775         *db = cs.db;
5776         *l = cs.l;
5777 }
5778 EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);
5779
5780 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
5781                                   struct kvm_sregs *sregs)
5782 {
5783         struct desc_ptr dt;
5784
5785         kvm_get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
5786         kvm_get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
5787         kvm_get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
5788         kvm_get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
5789         kvm_get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
5790         kvm_get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
5791
5792         kvm_get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
5793         kvm_get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
5794
5795         kvm_x86_ops->get_idt(vcpu, &dt);
5796         sregs->idt.limit = dt.size;
5797         sregs->idt.base = dt.address;
5798         kvm_x86_ops->get_gdt(vcpu, &dt);
5799         sregs->gdt.limit = dt.size;
5800         sregs->gdt.base = dt.address;
5801
5802         sregs->cr0 = kvm_read_cr0(vcpu);
5803         sregs->cr2 = vcpu->arch.cr2;
5804         sregs->cr3 = kvm_read_cr3(vcpu);
5805         sregs->cr4 = kvm_read_cr4(vcpu);
5806         sregs->cr8 = kvm_get_cr8(vcpu);
5807         sregs->efer = vcpu->arch.efer;
5808         sregs->apic_base = kvm_get_apic_base(vcpu);
5809
5810         memset(sregs->interrupt_bitmap, 0, sizeof sregs->interrupt_bitmap);
5811
5812         if (vcpu->arch.interrupt.pending && !vcpu->arch.interrupt.soft)
5813                 set_bit(vcpu->arch.interrupt.nr,
5814                         (unsigned long *)sregs->interrupt_bitmap);
5815
5816         return 0;
5817 }
5818
5819 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
5820                                     struct kvm_mp_state *mp_state)
5821 {
5822         mp_state->mp_state = vcpu->arch.mp_state;
5823         return 0;
5824 }
5825
5826 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
5827                                     struct kvm_mp_state *mp_state)
5828 {
5829         vcpu->arch.mp_state = mp_state->mp_state;
5830         kvm_make_request(KVM_REQ_EVENT, vcpu);
5831         return 0;
5832 }
5833
5834 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason,
5835                     bool has_error_code, u32 error_code)
5836 {
5837         struct decode_cache *c = &vcpu->arch.emulate_ctxt.decode;
5838         int ret;
5839
5840         init_emulate_ctxt(vcpu);
5841
5842         ret = emulator_task_switch(&vcpu->arch.emulate_ctxt,
5843                                    tss_selector, reason, has_error_code,
5844                                    error_code);
5845
5846         if (ret)
5847                 return EMULATE_FAIL;
5848
5849         memcpy(vcpu->arch.regs, c->regs, sizeof c->regs);
5850         kvm_rip_write(vcpu, vcpu->arch.emulate_ctxt.eip);
5851         kvm_set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);
5852         kvm_make_request(KVM_REQ_EVENT, vcpu);
5853         return EMULATE_DONE;
5854 }
5855 EXPORT_SYMBOL_GPL(kvm_task_switch);
5856
5857 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
5858                                   struct kvm_sregs *sregs)
5859 {
5860         int mmu_reset_needed = 0;
5861         int pending_vec, max_bits, idx;
5862         struct desc_ptr dt;
5863
5864         dt.size = sregs->idt.limit;
5865         dt.address = sregs->idt.base;
5866         kvm_x86_ops->set_idt(vcpu, &dt);
5867         dt.size = sregs->gdt.limit;
5868         dt.address = sregs->gdt.base;
5869         kvm_x86_ops->set_gdt(vcpu, &dt);
5870
5871         vcpu->arch.cr2 = sregs->cr2;
5872         mmu_reset_needed |= kvm_read_cr3(vcpu) != sregs->cr3;
5873         vcpu->arch.cr3 = sregs->cr3;
5874         __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail);
5875
5876         kvm_set_cr8(vcpu, sregs->cr8);
5877
5878         mmu_reset_needed |= vcpu->arch.efer != sregs->efer;
5879         kvm_x86_ops->set_efer(vcpu, sregs->efer);
5880         kvm_set_apic_base(vcpu, sregs->apic_base);
5881
5882         mmu_reset_needed |= kvm_read_cr0(vcpu) != sregs->cr0;
5883         kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
5884         vcpu->arch.cr0 = sregs->cr0;
5885
5886         mmu_reset_needed |= kvm_read_cr4(vcpu) != sregs->cr4;
5887         kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
5888         if (sregs->cr4 & X86_CR4_OSXSAVE)
5889                 update_cpuid(vcpu);
5890
5891         idx = srcu_read_lock(&vcpu->kvm->srcu);
5892         if (!is_long_mode(vcpu) && is_pae(vcpu)) {
5893                 load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu));
5894                 mmu_reset_needed = 1;
5895         }
5896         srcu_read_unlock(&vcpu->kvm->srcu, idx);
5897
5898         if (mmu_reset_needed)
5899                 kvm_mmu_reset_context(vcpu);
5900
5901         max_bits = (sizeof sregs->interrupt_bitmap) << 3;
5902         pending_vec = find_first_bit(
5903                 (const unsigned long *)sregs->interrupt_bitmap, max_bits);
5904         if (pending_vec < max_bits) {
5905                 kvm_queue_interrupt(vcpu, pending_vec, false);
5906                 pr_debug("Set back pending irq %d\n", pending_vec);
5907         }
5908
5909         kvm_set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
5910         kvm_set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
5911         kvm_set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
5912         kvm_set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
5913         kvm_set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
5914         kvm_set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
5915
5916         kvm_set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
5917         kvm_set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
5918
5919         update_cr8_intercept(vcpu);
5920
5921         /* Older userspace won't unhalt the vcpu on reset. */
5922         if (kvm_vcpu_is_bsp(vcpu) && kvm_rip_read(vcpu) == 0xfff0 &&
5923             sregs->cs.selector == 0xf000 && sregs->cs.base == 0xffff0000 &&
5924             !is_protmode(vcpu))
5925                 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
5926
5927         kvm_make_request(KVM_REQ_EVENT, vcpu);
5928
5929         return 0;
5930 }
5931
5932 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
5933                                         struct kvm_guest_debug *dbg)
5934 {
5935         unsigned long rflags;
5936         int i, r;
5937
5938         if (dbg->control & (KVM_GUESTDBG_INJECT_DB | KVM_GUESTDBG_INJECT_BP)) {
5939                 r = -EBUSY;
5940                 if (vcpu->arch.exception.pending)
5941                         goto out;
5942                 if (dbg->control & KVM_GUESTDBG_INJECT_DB)
5943                         kvm_queue_exception(vcpu, DB_VECTOR);
5944                 else
5945                         kvm_queue_exception(vcpu, BP_VECTOR);
5946         }
5947
5948         /*
5949          * Read rflags as long as potentially injected trace flags are still
5950          * filtered out.
5951          */
5952         rflags = kvm_get_rflags(vcpu);
5953
5954         vcpu->guest_debug = dbg->control;
5955         if (!(vcpu->guest_debug & KVM_GUESTDBG_ENABLE))
5956                 vcpu->guest_debug = 0;
5957
5958         if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) {
5959                 for (i = 0; i < KVM_NR_DB_REGS; ++i)
5960                         vcpu->arch.eff_db[i] = dbg->arch.debugreg[i];
5961                 vcpu->arch.switch_db_regs =
5962                         (dbg->arch.debugreg[7] & DR7_BP_EN_MASK);
5963         } else {
5964                 for (i = 0; i < KVM_NR_DB_REGS; i++)
5965                         vcpu->arch.eff_db[i] = vcpu->arch.db[i];
5966                 vcpu->arch.switch_db_regs = (vcpu->arch.dr7 & DR7_BP_EN_MASK);
5967         }
5968
5969         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
5970                 vcpu->arch.singlestep_rip = kvm_rip_read(vcpu) +
5971                         get_segment_base(vcpu, VCPU_SREG_CS);
5972
5973         /*
5974          * Trigger an rflags update that will inject or remove the trace
5975          * flags.
5976          */
5977         kvm_set_rflags(vcpu, rflags);
5978
5979         kvm_x86_ops->set_guest_debug(vcpu, dbg);
5980
5981         r = 0;
5982
5983 out:
5984
5985         return r;
5986 }
5987
5988 /*
5989  * Translate a guest virtual address to a guest physical address.
5990  */
5991 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
5992                                     struct kvm_translation *tr)
5993 {
5994         unsigned long vaddr = tr->linear_address;
5995         gpa_t gpa;
5996         int idx;
5997
5998         idx = srcu_read_lock(&vcpu->kvm->srcu);
5999         gpa = kvm_mmu_gva_to_gpa_system(vcpu, vaddr, NULL);
6000         srcu_read_unlock(&vcpu->kvm->srcu, idx);
6001         tr->physical_address = gpa;
6002         tr->valid = gpa != UNMAPPED_GVA;
6003         tr->writeable = 1;
6004         tr->usermode = 0;
6005
6006         return 0;
6007 }
6008
6009 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
6010 {
6011         struct i387_fxsave_struct *fxsave =
6012                         &vcpu->arch.guest_fpu.state->fxsave;
6013
6014         memcpy(fpu->fpr, fxsave->st_space, 128);
6015         fpu->fcw = fxsave->cwd;
6016         fpu->fsw = fxsave->swd;
6017         fpu->ftwx = fxsave->twd;
6018         fpu->last_opcode = fxsave->fop;
6019         fpu->last_ip = fxsave->rip;
6020         fpu->last_dp = fxsave->rdp;
6021         memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
6022
6023         return 0;
6024 }
6025
6026 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
6027 {
6028         struct i387_fxsave_struct *fxsave =
6029                         &vcpu->arch.guest_fpu.state->fxsave;
6030
6031         memcpy(fxsave->st_space, fpu->fpr, 128);
6032         fxsave->cwd = fpu->fcw;
6033         fxsave->swd = fpu->fsw;
6034         fxsave->twd = fpu->ftwx;
6035         fxsave->fop = fpu->last_opcode;
6036         fxsave->rip = fpu->last_ip;
6037         fxsave->rdp = fpu->last_dp;
6038         memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
6039
6040         return 0;
6041 }
6042
6043 int fx_init(struct kvm_vcpu *vcpu)
6044 {
6045         int err;
6046
6047         err = fpu_alloc(&vcpu->arch.guest_fpu);
6048         if (err)
6049                 return err;
6050
6051         fpu_finit(&vcpu->arch.guest_fpu);
6052
6053         /*
6054          * Ensure guest xcr0 is valid for loading
6055          */
6056         vcpu->arch.xcr0 = XSTATE_FP;
6057
6058         vcpu->arch.cr0 |= X86_CR0_ET;
6059
6060         return 0;
6061 }
6062 EXPORT_SYMBOL_GPL(fx_init);
6063
6064 static void fx_free(struct kvm_vcpu *vcpu)
6065 {
6066         fpu_free(&vcpu->arch.guest_fpu);
6067 }
6068
6069 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
6070 {
6071         if (vcpu->guest_fpu_loaded)
6072                 return;
6073
6074         /*
6075          * Restore all possible states in the guest,
6076          * and assume host would use all available bits.
6077          * Guest xcr0 would be loaded later.
6078          */
6079         kvm_put_guest_xcr0(vcpu);
6080         vcpu->guest_fpu_loaded = 1;
6081         unlazy_fpu(current);
6082         fpu_restore_checking(&vcpu->arch.guest_fpu);
6083         trace_kvm_fpu(1);
6084 }
6085
6086 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
6087 {
6088         kvm_put_guest_xcr0(vcpu);
6089
6090         if (!vcpu->guest_fpu_loaded)
6091                 return;
6092
6093         vcpu->guest_fpu_loaded = 0;
6094         fpu_save_init(&vcpu->arch.guest_fpu);
6095         ++vcpu->stat.fpu_reload;
6096         kvm_make_request(KVM_REQ_DEACTIVATE_FPU, vcpu);
6097         trace_kvm_fpu(0);
6098 }
6099
6100 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
6101 {
6102         kvmclock_reset(vcpu);
6103
6104         free_cpumask_var(vcpu->arch.wbinvd_dirty_mask);
6105         fx_free(vcpu);
6106         kvm_x86_ops->vcpu_free(vcpu);
6107 }
6108
6109 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
6110                                                 unsigned int id)
6111 {
6112         if (check_tsc_unstable() && atomic_read(&kvm->online_vcpus) != 0)
6113                 printk_once(KERN_WARNING
6114                 "kvm: SMP vm created on host with unstable TSC; "
6115                 "guest TSC will not be reliable\n");
6116         return kvm_x86_ops->vcpu_create(kvm, id);
6117 }
6118
6119 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
6120 {
6121         int r;
6122
6123         vcpu->arch.mtrr_state.have_fixed = 1;
6124         vcpu_load(vcpu);
6125         r = kvm_arch_vcpu_reset(vcpu);
6126         if (r == 0)
6127                 r = kvm_mmu_setup(vcpu);
6128         vcpu_put(vcpu);
6129         if (r < 0)
6130                 goto free_vcpu;
6131
6132         return 0;
6133 free_vcpu:
6134         kvm_x86_ops->vcpu_free(vcpu);
6135         return r;
6136 }
6137
6138 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
6139 {
6140         vcpu->arch.apf.msr_val = 0;
6141
6142         vcpu_load(vcpu);
6143         kvm_mmu_unload(vcpu);
6144         vcpu_put(vcpu);
6145
6146         fx_free(vcpu);
6147         kvm_x86_ops->vcpu_free(vcpu);
6148 }
6149
6150 int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu)
6151 {
6152         vcpu->arch.nmi_pending = false;
6153         vcpu->arch.nmi_injected = false;
6154
6155         vcpu->arch.switch_db_regs = 0;
6156         memset(vcpu->arch.db, 0, sizeof(vcpu->arch.db));
6157         vcpu->arch.dr6 = DR6_FIXED_1;
6158         vcpu->arch.dr7 = DR7_FIXED_1;
6159
6160         kvm_make_request(KVM_REQ_EVENT, vcpu);
6161         vcpu->arch.apf.msr_val = 0;
6162
6163         kvmclock_reset(vcpu);
6164
6165         kvm_clear_async_pf_completion_queue(vcpu);
6166         kvm_async_pf_hash_reset(vcpu);
6167         vcpu->arch.apf.halted = false;
6168
6169         return kvm_x86_ops->vcpu_reset(vcpu);
6170 }
6171
6172 int kvm_arch_hardware_enable(void *garbage)
6173 {
6174         struct kvm *kvm;
6175         struct kvm_vcpu *vcpu;
6176         int i;
6177
6178         kvm_shared_msr_cpu_online();
6179         list_for_each_entry(kvm, &vm_list, vm_list)
6180                 kvm_for_each_vcpu(i, vcpu, kvm)
6181                         if (vcpu->cpu == smp_processor_id())
6182                                 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
6183         return kvm_x86_ops->hardware_enable(garbage);
6184 }
6185
6186 void kvm_arch_hardware_disable(void *garbage)
6187 {
6188         kvm_x86_ops->hardware_disable(garbage);
6189         drop_user_return_notifiers(garbage);
6190 }
6191
6192 int kvm_arch_hardware_setup(void)
6193 {
6194         return kvm_x86_ops->hardware_setup();
6195 }
6196
6197 void kvm_arch_hardware_unsetup(void)
6198 {
6199         kvm_x86_ops->hardware_unsetup();
6200 }
6201
6202 void kvm_arch_check_processor_compat(void *rtn)
6203 {
6204         kvm_x86_ops->check_processor_compatibility(rtn);
6205 }
6206
6207 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
6208 {
6209         struct page *page;
6210         struct kvm *kvm;
6211         int r;
6212
6213         BUG_ON(vcpu->kvm == NULL);
6214         kvm = vcpu->kvm;
6215
6216         vcpu->arch.emulate_ctxt.ops = &emulate_ops;
6217         vcpu->arch.walk_mmu = &vcpu->arch.mmu;
6218         vcpu->arch.mmu.root_hpa = INVALID_PAGE;
6219         vcpu->arch.mmu.translate_gpa = translate_gpa;
6220         vcpu->arch.nested_mmu.translate_gpa = translate_nested_gpa;
6221         if (!irqchip_in_kernel(kvm) || kvm_vcpu_is_bsp(vcpu))
6222                 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
6223         else
6224                 vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED;
6225
6226         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
6227         if (!page) {
6228                 r = -ENOMEM;
6229                 goto fail;
6230         }
6231         vcpu->arch.pio_data = page_address(page);
6232
6233         kvm_init_tsc_catchup(vcpu, max_tsc_khz);
6234
6235         r = kvm_mmu_create(vcpu);
6236         if (r < 0)
6237                 goto fail_free_pio_data;
6238
6239         if (irqchip_in_kernel(kvm)) {
6240                 r = kvm_create_lapic(vcpu);
6241                 if (r < 0)
6242                         goto fail_mmu_destroy;
6243         }
6244
6245         vcpu->arch.mce_banks = kzalloc(KVM_MAX_MCE_BANKS * sizeof(u64) * 4,
6246                                        GFP_KERNEL);
6247         if (!vcpu->arch.mce_banks) {
6248                 r = -ENOMEM;
6249                 goto fail_free_lapic;
6250         }
6251         vcpu->arch.mcg_cap = KVM_MAX_MCE_BANKS;
6252
6253         if (!zalloc_cpumask_var(&vcpu->arch.wbinvd_dirty_mask, GFP_KERNEL))
6254                 goto fail_free_mce_banks;
6255
6256         kvm_async_pf_hash_reset(vcpu);
6257
6258         return 0;
6259 fail_free_mce_banks:
6260         kfree(vcpu->arch.mce_banks);
6261 fail_free_lapic:
6262         kvm_free_lapic(vcpu);
6263 fail_mmu_destroy:
6264         kvm_mmu_destroy(vcpu);
6265 fail_free_pio_data:
6266         free_page((unsigned long)vcpu->arch.pio_data);
6267 fail:
6268         return r;
6269 }
6270
6271 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
6272 {
6273         int idx;
6274
6275         kfree(vcpu->arch.mce_banks);
6276         kvm_free_lapic(vcpu);
6277         idx = srcu_read_lock(&vcpu->kvm->srcu);
6278         kvm_mmu_destroy(vcpu);
6279         srcu_read_unlock(&vcpu->kvm->srcu, idx);
6280         free_page((unsigned long)vcpu->arch.pio_data);
6281 }
6282
6283 int kvm_arch_init_vm(struct kvm *kvm)
6284 {
6285         INIT_LIST_HEAD(&kvm->arch.active_mmu_pages);
6286         INIT_LIST_HEAD(&kvm->arch.assigned_dev_head);
6287
6288         /* Reserve bit 0 of irq_sources_bitmap for userspace irq source */
6289         set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap);
6290
6291         raw_spin_lock_init(&kvm->arch.tsc_write_lock);
6292
6293         return 0;
6294 }
6295
6296 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
6297 {
6298         vcpu_load(vcpu);
6299         kvm_mmu_unload(vcpu);
6300         vcpu_put(vcpu);
6301 }
6302
6303 static void kvm_free_vcpus(struct kvm *kvm)
6304 {
6305         unsigned int i;
6306         struct kvm_vcpu *vcpu;
6307
6308         /*
6309          * Unpin any mmu pages first.
6310          */
6311         kvm_for_each_vcpu(i, vcpu, kvm) {
6312                 kvm_clear_async_pf_completion_queue(vcpu);
6313                 kvm_unload_vcpu_mmu(vcpu);
6314         }
6315         kvm_for_each_vcpu(i, vcpu, kvm)
6316                 kvm_arch_vcpu_free(vcpu);
6317
6318         mutex_lock(&kvm->lock);
6319         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
6320                 kvm->vcpus[i] = NULL;
6321
6322         atomic_set(&kvm->online_vcpus, 0);
6323         mutex_unlock(&kvm->lock);
6324 }
6325
6326 void kvm_arch_sync_events(struct kvm *kvm)
6327 {
6328         kvm_free_all_assigned_devices(kvm);
6329         kvm_free_pit(kvm);
6330 }
6331
6332 void kvm_arch_destroy_vm(struct kvm *kvm)
6333 {
6334         kvm_iommu_unmap_guest(kvm);
6335         kfree(kvm->arch.vpic);
6336         kfree(kvm->arch.vioapic);
6337         kvm_free_vcpus(kvm);
6338         if (kvm->arch.apic_access_page)
6339                 put_page(kvm->arch.apic_access_page);
6340         if (kvm->arch.ept_identity_pagetable)
6341                 put_page(kvm->arch.ept_identity_pagetable);
6342 }
6343
6344 int kvm_arch_prepare_memory_region(struct kvm *kvm,
6345                                 struct kvm_memory_slot *memslot,
6346                                 struct kvm_memory_slot old,
6347                                 struct kvm_userspace_memory_region *mem,
6348                                 int user_alloc)
6349 {
6350         int npages = memslot->npages;
6351         int map_flags = MAP_PRIVATE | MAP_ANONYMOUS;
6352
6353         /* Prevent internal slot pages from being moved by fork()/COW. */
6354         if (memslot->id >= KVM_MEMORY_SLOTS)
6355                 map_flags = MAP_SHARED | MAP_ANONYMOUS;
6356
6357         /*To keep backward compatibility with older userspace,
6358          *x86 needs to hanlde !user_alloc case.
6359          */
6360         if (!user_alloc) {
6361                 if (npages && !old.rmap) {
6362                         unsigned long userspace_addr;
6363
6364                         down_write(&current->mm->mmap_sem);
6365                         userspace_addr = do_mmap(NULL, 0,
6366                                                  npages * PAGE_SIZE,
6367                                                  PROT_READ | PROT_WRITE,
6368                                                  map_flags,
6369                                                  0);
6370                         up_write(&current->mm->mmap_sem);
6371
6372                         if (IS_ERR((void *)userspace_addr))
6373                                 return PTR_ERR((void *)userspace_addr);
6374
6375                         memslot->userspace_addr = userspace_addr;
6376                 }
6377         }
6378
6379
6380         return 0;
6381 }
6382
6383 void kvm_arch_commit_memory_region(struct kvm *kvm,
6384                                 struct kvm_userspace_memory_region *mem,
6385                                 struct kvm_memory_slot old,
6386                                 int user_alloc)
6387 {
6388
6389         int nr_mmu_pages = 0, npages = mem->memory_size >> PAGE_SHIFT;
6390
6391         if (!user_alloc && !old.user_alloc && old.rmap && !npages) {
6392                 int ret;
6393
6394                 down_write(&current->mm->mmap_sem);
6395                 ret = do_munmap(current->mm, old.userspace_addr,
6396                                 old.npages * PAGE_SIZE);
6397                 up_write(&current->mm->mmap_sem);
6398                 if (ret < 0)
6399                         printk(KERN_WARNING
6400                                "kvm_vm_ioctl_set_memory_region: "
6401                                "failed to munmap memory\n");
6402         }
6403
6404         if (!kvm->arch.n_requested_mmu_pages)
6405                 nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm);
6406
6407         spin_lock(&kvm->mmu_lock);
6408         if (nr_mmu_pages)
6409                 kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
6410         kvm_mmu_slot_remove_write_access(kvm, mem->slot);
6411         spin_unlock(&kvm->mmu_lock);
6412 }
6413
6414 void kvm_arch_flush_shadow(struct kvm *kvm)
6415 {
6416         kvm_mmu_zap_all(kvm);
6417         kvm_reload_remote_mmus(kvm);
6418 }
6419
6420 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
6421 {
6422         return (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE &&
6423                 !vcpu->arch.apf.halted)
6424                 || !list_empty_careful(&vcpu->async_pf.done)
6425                 || vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED
6426                 || vcpu->arch.nmi_pending ||
6427                 (kvm_arch_interrupt_allowed(vcpu) &&
6428                  kvm_cpu_has_interrupt(vcpu));
6429 }
6430
6431 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
6432 {
6433         int me;
6434         int cpu = vcpu->cpu;
6435
6436         if (waitqueue_active(&vcpu->wq)) {
6437                 wake_up_interruptible(&vcpu->wq);
6438                 ++vcpu->stat.halt_wakeup;
6439         }
6440
6441         me = get_cpu();
6442         if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
6443                 if (kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE)
6444                         smp_send_reschedule(cpu);
6445         put_cpu();
6446 }
6447
6448 int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu)
6449 {
6450         return kvm_x86_ops->interrupt_allowed(vcpu);
6451 }
6452
6453 bool kvm_is_linear_rip(struct kvm_vcpu *vcpu, unsigned long linear_rip)
6454 {
6455         unsigned long current_rip = kvm_rip_read(vcpu) +
6456                 get_segment_base(vcpu, VCPU_SREG_CS);
6457
6458         return current_rip == linear_rip;
6459 }
6460 EXPORT_SYMBOL_GPL(kvm_is_linear_rip);
6461
6462 unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu)
6463 {
6464         unsigned long rflags;
6465
6466         rflags = kvm_x86_ops->get_rflags(vcpu);
6467         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
6468                 rflags &= ~X86_EFLAGS_TF;
6469         return rflags;
6470 }
6471 EXPORT_SYMBOL_GPL(kvm_get_rflags);
6472
6473 void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
6474 {
6475         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP &&
6476             kvm_is_linear_rip(vcpu, vcpu->arch.singlestep_rip))
6477                 rflags |= X86_EFLAGS_TF;
6478         kvm_x86_ops->set_rflags(vcpu, rflags);
6479         kvm_make_request(KVM_REQ_EVENT, vcpu);
6480 }
6481 EXPORT_SYMBOL_GPL(kvm_set_rflags);
6482
6483 void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, struct kvm_async_pf *work)
6484 {
6485         int r;
6486
6487         if ((vcpu->arch.mmu.direct_map != work->arch.direct_map) ||
6488               is_error_page(work->page))
6489                 return;
6490
6491         r = kvm_mmu_reload(vcpu);
6492         if (unlikely(r))
6493                 return;
6494
6495         if (!vcpu->arch.mmu.direct_map &&
6496               work->arch.cr3 != vcpu->arch.mmu.get_cr3(vcpu))
6497                 return;
6498
6499         vcpu->arch.mmu.page_fault(vcpu, work->gva, 0, true);
6500 }
6501
6502 static inline u32 kvm_async_pf_hash_fn(gfn_t gfn)
6503 {
6504         return hash_32(gfn & 0xffffffff, order_base_2(ASYNC_PF_PER_VCPU));
6505 }
6506
6507 static inline u32 kvm_async_pf_next_probe(u32 key)
6508 {
6509         return (key + 1) & (roundup_pow_of_two(ASYNC_PF_PER_VCPU) - 1);
6510 }
6511
6512 static void kvm_add_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
6513 {
6514         u32 key = kvm_async_pf_hash_fn(gfn);
6515
6516         while (vcpu->arch.apf.gfns[key] != ~0)
6517                 key = kvm_async_pf_next_probe(key);
6518
6519         vcpu->arch.apf.gfns[key] = gfn;
6520 }
6521
6522 static u32 kvm_async_pf_gfn_slot(struct kvm_vcpu *vcpu, gfn_t gfn)
6523 {
6524         int i;
6525         u32 key = kvm_async_pf_hash_fn(gfn);
6526
6527         for (i = 0; i < roundup_pow_of_two(ASYNC_PF_PER_VCPU) &&
6528                      (vcpu->arch.apf.gfns[key] != gfn &&
6529                       vcpu->arch.apf.gfns[key] != ~0); i++)
6530                 key = kvm_async_pf_next_probe(key);
6531
6532         return key;
6533 }
6534
6535 bool kvm_find_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
6536 {
6537         return vcpu->arch.apf.gfns[kvm_async_pf_gfn_slot(vcpu, gfn)] == gfn;
6538 }
6539
6540 static void kvm_del_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
6541 {
6542         u32 i, j, k;
6543
6544         i = j = kvm_async_pf_gfn_slot(vcpu, gfn);
6545         while (true) {
6546                 vcpu->arch.apf.gfns[i] = ~0;
6547                 do {
6548                         j = kvm_async_pf_next_probe(j);
6549                         if (vcpu->arch.apf.gfns[j] == ~0)
6550                                 return;
6551                         k = kvm_async_pf_hash_fn(vcpu->arch.apf.gfns[j]);
6552                         /*
6553                          * k lies cyclically in ]i,j]
6554                          * |    i.k.j |
6555                          * |....j i.k.| or  |.k..j i...|
6556                          */
6557                 } while ((i <= j) ? (i < k && k <= j) : (i < k || k <= j));
6558                 vcpu->arch.apf.gfns[i] = vcpu->arch.apf.gfns[j];
6559                 i = j;
6560         }
6561 }
6562
6563 static int apf_put_user(struct kvm_vcpu *vcpu, u32 val)
6564 {
6565
6566         return kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.apf.data, &val,
6567                                       sizeof(val));
6568 }
6569
6570 void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
6571                                      struct kvm_async_pf *work)
6572 {
6573         struct x86_exception fault;
6574
6575         trace_kvm_async_pf_not_present(work->arch.token, work->gva);
6576         kvm_add_async_pf_gfn(vcpu, work->arch.gfn);
6577
6578         if (!(vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED) ||
6579             (vcpu->arch.apf.send_user_only &&
6580              kvm_x86_ops->get_cpl(vcpu) == 0))
6581                 kvm_make_request(KVM_REQ_APF_HALT, vcpu);
6582         else if (!apf_put_user(vcpu, KVM_PV_REASON_PAGE_NOT_PRESENT)) {
6583                 fault.vector = PF_VECTOR;
6584                 fault.error_code_valid = true;
6585                 fault.error_code = 0;
6586                 fault.nested_page_fault = false;
6587                 fault.address = work->arch.token;
6588                 kvm_inject_page_fault(vcpu, &fault);
6589         }
6590 }
6591
6592 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
6593                                  struct kvm_async_pf *work)
6594 {
6595         struct x86_exception fault;
6596
6597         trace_kvm_async_pf_ready(work->arch.token, work->gva);
6598         if (is_error_page(work->page))
6599                 work->arch.token = ~0; /* broadcast wakeup */
6600         else
6601                 kvm_del_async_pf_gfn(vcpu, work->arch.gfn);
6602
6603         if ((vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED) &&
6604             !apf_put_user(vcpu, KVM_PV_REASON_PAGE_READY)) {
6605                 fault.vector = PF_VECTOR;
6606                 fault.error_code_valid = true;
6607                 fault.error_code = 0;
6608                 fault.nested_page_fault = false;
6609                 fault.address = work->arch.token;
6610                 kvm_inject_page_fault(vcpu, &fault);
6611         }
6612         vcpu->arch.apf.halted = false;
6613 }
6614
6615 bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu)
6616 {
6617         if (!(vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED))
6618                 return true;
6619         else
6620                 return !kvm_event_needs_reinjection(vcpu) &&
6621                         kvm_x86_ops->interrupt_allowed(vcpu);
6622 }
6623
6624 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_exit);
6625 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq);
6626 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_page_fault);
6627 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_msr);
6628 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_cr);
6629 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmrun);
6630 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit);
6631 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit_inject);
6632 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intr_vmexit);
6633 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_invlpga);
6634 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_skinit);
6635 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intercepts);