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 #include "cpuid.h"
  30
  31 #include <linux/clocksource.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/kvm.h>
  34 #include <linux/fs.h>
  35 #include <linux/vmalloc.h>
  36 #include <linux/module.h>
  37 #include <linux/mman.h>
  38 #include <linux/highmem.h>
  39 #include <linux/iommu.h>
  40 #include <linux/intel-iommu.h>
  41 #include <linux/cpufreq.h>
  42 #include <linux/user-return-notifier.h>
  43 #include <linux/srcu.h>
  44 #include <linux/slab.h>
  45 #include <linux/perf_event.h>
  46 #include <linux/uaccess.h>
  47 #include <linux/hash.h>
  48 #include <linux/pci.h>
  49 #include <trace/events/kvm.h>
  50
  51 #define CREATE_TRACE_POINTS
  52 #include "trace.h"
  53
  54 #include <asm/debugreg.h>
  55 #include <asm/msr.h>
  56 #include <asm/desc.h>
  57 #include <asm/mtrr.h>
  58 #include <asm/mce.h>
  59 #include <asm/i387.h>
  60 #include <asm/fpu-internal.h> /* Ugh! */
  61 #include <asm/xcr.h>
  62 #include <asm/pvclock.h>
  63 #include <asm/div64.h>
  64
  65 #define MAX_IO_MSRS 256
  66 #define KVM_MAX_MCE_BANKS 32
  67 #define KVM_MCE_CAP_SUPPORTED (MCG_CTL_P | MCG_SER_P)
  68
  69 #define emul_to_vcpu(ctxt) \
  70         container_of(ctxt, struct kvm_vcpu, arch.emulate_ctxt)
  71
  72 /* EFER defaults:
  73  * - enable syscall per default because its emulated by KVM
  74  * - enable LME and LMA per default on 64 bit KVM
  75  */
  76 #ifdef CONFIG_X86_64
  77 static
  78 u64 __read_mostly efer_reserved_bits = ~((u64)(EFER_SCE | EFER_LME | EFER_LMA));
  79 #else
  80 static u64 __read_mostly efer_reserved_bits = ~((u64)EFER_SCE);
  81 #endif
  82
  83 #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
  84 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
  85
  86 static void update_cr8_intercept(struct kvm_vcpu *vcpu);
  87 static void process_nmi(struct kvm_vcpu *vcpu);
  88
  89 struct kvm_x86_ops *kvm_x86_ops;
  90 EXPORT_SYMBOL_GPL(kvm_x86_ops);
  91
  92 static bool ignore_msrs = 0;
  93 module_param(ignore_msrs, bool, S_IRUGO | S_IWUSR);
  94
  95 bool kvm_has_tsc_control;
  96 EXPORT_SYMBOL_GPL(kvm_has_tsc_control);
  97 u32  kvm_max_guest_tsc_khz;
  98 EXPORT_SYMBOL_GPL(kvm_max_guest_tsc_khz);
  99
 100 /* tsc tolerance in parts per million - default to 1/2 of the NTP threshold */
 101 static u32 tsc_tolerance_ppm = 250;
 102 module_param(tsc_tolerance_ppm, uint, S_IRUGO | S_IWUSR);
 103
 104 #define KVM_NR_SHARED_MSRS 16
 105
 106 struct kvm_shared_msrs_global {
 107         int nr;
 108         u32 msrs[KVM_NR_SHARED_MSRS];
 109 };
 110
 111 struct kvm_shared_msrs {
 112         struct user_return_notifier urn;
 113         bool registered;
 114         struct kvm_shared_msr_values {
 115                 u64 host;
 116                 u64 curr;
 117         } values[KVM_NR_SHARED_MSRS];
 118 };
 119
 120 static struct kvm_shared_msrs_global __read_mostly shared_msrs_global;
 121 static DEFINE_PER_CPU(struct kvm_shared_msrs, shared_msrs);
 122
 123 struct kvm_stats_debugfs_item debugfs_entries[] = {
 124         { "pf_fixed", VCPU_STAT(pf_fixed) },
 125         { "pf_guest", VCPU_STAT(pf_guest) },
 126         { "tlb_flush", VCPU_STAT(tlb_flush) },
 127         { "invlpg", VCPU_STAT(invlpg) },
 128         { "exits", VCPU_STAT(exits) },
 129         { "io_exits", VCPU_STAT(io_exits) },
 130         { "mmio_exits", VCPU_STAT(mmio_exits) },
 131         { "signal_exits", VCPU_STAT(signal_exits) },
 132         { "irq_window", VCPU_STAT(irq_window_exits) },
 133         { "nmi_window", VCPU_STAT(nmi_window_exits) },
 134         { "halt_exits", VCPU_STAT(halt_exits) },
 135         { "halt_wakeup", VCPU_STAT(halt_wakeup) },
 136         { "hypercalls", VCPU_STAT(hypercalls) },
 137         { "request_irq", VCPU_STAT(request_irq_exits) },
 138         { "irq_exits", VCPU_STAT(irq_exits) },
 139         { "host_state_reload", VCPU_STAT(host_state_reload) },
 140         { "efer_reload", VCPU_STAT(efer_reload) },
 141         { "fpu_reload", VCPU_STAT(fpu_reload) },
 142         { "insn_emulation", VCPU_STAT(insn_emulation) },
 143         { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) },
 144         { "irq_injections", VCPU_STAT(irq_injections) },
 145         { "nmi_injections", VCPU_STAT(nmi_injections) },
 146         { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) },
 147         { "mmu_pte_write", VM_STAT(mmu_pte_write) },
 148         { "mmu_pte_updated", VM_STAT(mmu_pte_updated) },
 149         { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) },
 150         { "mmu_flooded", VM_STAT(mmu_flooded) },
 151         { "mmu_recycled", VM_STAT(mmu_recycled) },
 152         { "mmu_cache_miss", VM_STAT(mmu_cache_miss) },
 153         { "mmu_unsync", VM_STAT(mmu_unsync) },
 154         { "remote_tlb_flush", VM_STAT(remote_tlb_flush) },
 155         { "largepages", VM_STAT(lpages) },
 156         { NULL }
 157 };
 158
 159 u64 __read_mostly host_xcr0;
 160
 161 int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt);
 162
 163 static inline void kvm_async_pf_hash_reset(struct kvm_vcpu *vcpu)
 164 {
 165         int i;
 166         for (i = 0; i < roundup_pow_of_two(ASYNC_PF_PER_VCPU); i++)
 167                 vcpu->arch.apf.gfns[i] = ~0;
 168 }
 169
 170 static void kvm_on_user_return(struct user_return_notifier *urn)
 171 {
 172         unsigned slot;
 173         struct kvm_shared_msrs *locals
 174                 = container_of(urn, struct kvm_shared_msrs, urn);
 175         struct kvm_shared_msr_values *values;
 176
 177         for (slot = 0; slot < shared_msrs_global.nr; ++slot) {
 178                 values = &locals->values[slot];
 179                 if (values->host != values->curr) {
 180                         wrmsrl(shared_msrs_global.msrs[slot], values->host);
 181                         values->curr = values->host;
 182                 }
 183         }
 184         locals->registered = false;
 185         user_return_notifier_unregister(urn);
 186 }
 187
 188 static void shared_msr_update(unsigned slot, u32 msr)
 189 {
 190         struct kvm_shared_msrs *smsr;
 191         u64 value;
 192
 193         smsr = &__get_cpu_var(shared_msrs);
 194         /* only read, and nobody should modify it at this time,
 195          * so don't need lock */
 196         if (slot >= shared_msrs_global.nr) {
 197                 printk(KERN_ERR "kvm: invalid MSR slot!");
 198                 return;
 199         }
 200         rdmsrl_safe(msr, &value);
 201         smsr->values[slot].host = value;
 202         smsr->values[slot].curr = value;
 203 }
 204
 205 void kvm_define_shared_msr(unsigned slot, u32 msr)
 206 {
 207         if (slot >= shared_msrs_global.nr)
 208                 shared_msrs_global.nr = slot + 1;
 209         shared_msrs_global.msrs[slot] = msr;
 210         /* we need ensured the shared_msr_global have been updated */
 211         smp_wmb();
 212 }
 213 EXPORT_SYMBOL_GPL(kvm_define_shared_msr);
 214
 215 static void kvm_shared_msr_cpu_online(void)
 216 {
 217         unsigned i;
 218
 219         for (i = 0; i < shared_msrs_global.nr; ++i)
 220                 shared_msr_update(i, shared_msrs_global.msrs[i]);
 221 }
 222
 223 void kvm_set_shared_msr(unsigned slot, u64 value, u64 mask)
 224 {
 225         struct kvm_shared_msrs *smsr = &__get_cpu_var(shared_msrs);
 226
 227         if (((value ^ smsr->values[slot].curr) & mask) == 0)
 228                 return;
 229         smsr->values[slot].curr = value;
 230         wrmsrl(shared_msrs_global.msrs[slot], value);
 231         if (!smsr->registered) {
 232                 smsr->urn.on_user_return = kvm_on_user_return;
 233                 user_return_notifier_register(&smsr->urn);
 234                 smsr->registered = true;
 235         }
 236 }
 237 EXPORT_SYMBOL_GPL(kvm_set_shared_msr);
 238
 239 static void drop_user_return_notifiers(void *ignore)
 240 {
 241         struct kvm_shared_msrs *smsr = &__get_cpu_var(shared_msrs);
 242
 243         if (smsr->registered)
 244                 kvm_on_user_return(&smsr->urn);
 245 }
 246
 247 u64 kvm_get_apic_base(struct kvm_vcpu *vcpu)
 248 {
 249         if (irqchip_in_kernel(vcpu->kvm))
 250                 return vcpu->arch.apic_base;
 251         else
 252                 return vcpu->arch.apic_base;
 253 }
 254 EXPORT_SYMBOL_GPL(kvm_get_apic_base);
 255
 256 void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data)
 257 {
 258         /* TODO: reserve bits check */
 259         if (irqchip_in_kernel(vcpu->kvm))
 260                 kvm_lapic_set_base(vcpu, data);
 261         else
 262                 vcpu->arch.apic_base = data;
 263 }
 264 EXPORT_SYMBOL_GPL(kvm_set_apic_base);
 265
 266 #define EXCPT_BENIGN            0
 267 #define EXCPT_CONTRIBUTORY      1
 268 #define EXCPT_PF                2
 269
 270 static int exception_class(int vector)
 271 {
 272         switch (vector) {
 273         case PF_VECTOR:
 274                 return EXCPT_PF;
 275         case DE_VECTOR:
 276         case TS_VECTOR:
 277         case NP_VECTOR:
 278         case SS_VECTOR:
 279         case GP_VECTOR:
 280                 return EXCPT_CONTRIBUTORY;
 281         default:
 282                 break;
 283         }
 284         return EXCPT_BENIGN;
 285 }
 286
 287 static void kvm_multiple_exception(struct kvm_vcpu *vcpu,
 288                 unsigned nr, bool has_error, u32 error_code,
 289                 bool reinject)
 290 {
 291         u32 prev_nr;
 292         int class1, class2;
 293
 294         kvm_make_request(KVM_REQ_EVENT, vcpu);
 295
 296         if (!vcpu->arch.exception.pending) {
 297         queue:
 298                 vcpu->arch.exception.pending = true;
 299                 vcpu->arch.exception.has_error_code = has_error;
 300                 vcpu->arch.exception.nr = nr;
 301                 vcpu->arch.exception.error_code = error_code;
 302                 vcpu->arch.exception.reinject = reinject;
 303                 return;
 304         }
 305
 306         /* to check exception */
 307         prev_nr = vcpu->arch.exception.nr;
 308         if (prev_nr == DF_VECTOR) {
 309                 /* triple fault -> shutdown */
 310                 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
 311                 return;
 312         }
 313         class1 = exception_class(prev_nr);
 314         class2 = exception_class(nr);
 315         if ((class1 == EXCPT_CONTRIBUTORY && class2 == EXCPT_CONTRIBUTORY)
 316                 || (class1 == EXCPT_PF && class2 != EXCPT_BENIGN)) {
 317                 /* generate double fault per SDM Table 5-5 */
 318                 vcpu->arch.exception.pending = true;
 319                 vcpu->arch.exception.has_error_code = true;
 320                 vcpu->arch.exception.nr = DF_VECTOR;
 321                 vcpu->arch.exception.error_code = 0;
 322         } else
 323                 /* replace previous exception with a new one in a hope
 324                    that instruction re-execution will regenerate lost
 325                    exception */
 326                 goto queue;
 327 }
 328
 329 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr)
 330 {
 331         kvm_multiple_exception(vcpu, nr, false, 0, false);
 332 }
 333 EXPORT_SYMBOL_GPL(kvm_queue_exception);
 334
 335 void kvm_requeue_exception(struct kvm_vcpu *vcpu, unsigned nr)
 336 {
 337         kvm_multiple_exception(vcpu, nr, false, 0, true);
 338 }
 339 EXPORT_SYMBOL_GPL(kvm_requeue_exception);
 340
 341 void kvm_complete_insn_gp(struct kvm_vcpu *vcpu, int err)
 342 {
 343         if (err)
 344                 kvm_inject_gp(vcpu, 0);
 345         else
 346                 kvm_x86_ops->skip_emulated_instruction(vcpu);
 347 }
 348 EXPORT_SYMBOL_GPL(kvm_complete_insn_gp);
 349
 350 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault)
 351 {
 352         ++vcpu->stat.pf_guest;
 353         vcpu->arch.cr2 = fault->address;
 354         kvm_queue_exception_e(vcpu, PF_VECTOR, fault->error_code);
 355 }
 356 EXPORT_SYMBOL_GPL(kvm_inject_page_fault);
 357
 358 void kvm_propagate_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault)
 359 {
 360         if (mmu_is_nested(vcpu) && !fault->nested_page_fault)
 361                 vcpu->arch.nested_mmu.inject_page_fault(vcpu, fault);
 362         else
 363                 vcpu->arch.mmu.inject_page_fault(vcpu, fault);
 364 }
 365
 366 void kvm_inject_nmi(struct kvm_vcpu *vcpu)
 367 {
 368         atomic_inc(&vcpu->arch.nmi_queued);
 369         kvm_make_request(KVM_REQ_NMI, vcpu);
 370 }
 371 EXPORT_SYMBOL_GPL(kvm_inject_nmi);
 372
 373 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
 374 {
 375         kvm_multiple_exception(vcpu, nr, true, error_code, false);
 376 }
 377 EXPORT_SYMBOL_GPL(kvm_queue_exception_e);
 378
 379 void kvm_requeue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
 380 {
 381         kvm_multiple_exception(vcpu, nr, true, error_code, true);
 382 }
 383 EXPORT_SYMBOL_GPL(kvm_requeue_exception_e);
 384
 385 /*
 386  * Checks if cpl <= required_cpl; if true, return true.  Otherwise queue
 387  * a #GP and return false.
 388  */
 389 bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl)
 390 {
 391         if (kvm_x86_ops->get_cpl(vcpu) <= required_cpl)
 392                 return true;
 393         kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
 394         return false;
 395 }
 396 EXPORT_SYMBOL_GPL(kvm_require_cpl);
 397
 398 /*
 399  * This function will be used to read from the physical memory of the currently
 400  * running guest. The difference to kvm_read_guest_page is that this function
 401  * can read from guest physical or from the guest's guest physical memory.
 402  */
 403 int kvm_read_guest_page_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
 404                             gfn_t ngfn, void *data, int offset, int len,
 405                             u32 access)
 406 {
 407         gfn_t real_gfn;
 408         gpa_t ngpa;
 409
 410         ngpa     = gfn_to_gpa(ngfn);
 411         real_gfn = mmu->translate_gpa(vcpu, ngpa, access);
 412         if (real_gfn == UNMAPPED_GVA)
 413                 return -EFAULT;
 414
 415         real_gfn = gpa_to_gfn(real_gfn);
 416
 417         return kvm_read_guest_page(vcpu->kvm, real_gfn, data, offset, len);
 418 }
 419 EXPORT_SYMBOL_GPL(kvm_read_guest_page_mmu);
 420
 421 int kvm_read_nested_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn,
 422                                void *data, int offset, int len, u32 access)
 423 {
 424         return kvm_read_guest_page_mmu(vcpu, vcpu->arch.walk_mmu, gfn,
 425                                        data, offset, len, access);
 426 }
 427
 428 /*
 429  * Load the pae pdptrs.  Return true is they are all valid.
 430  */
 431 int load_pdptrs(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, unsigned long cr3)
 432 {
 433         gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
 434         unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
 435         int i;
 436         int ret;
 437         u64 pdpte[ARRAY_SIZE(mmu->pdptrs)];
 438
 439         ret = kvm_read_guest_page_mmu(vcpu, mmu, pdpt_gfn, pdpte,
 440                                       offset * sizeof(u64), sizeof(pdpte),
 441                                       PFERR_USER_MASK|PFERR_WRITE_MASK);
 442         if (ret < 0) {
 443                 ret = 0;
 444                 goto out;
 445         }
 446         for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
 447                 if (is_present_gpte(pdpte[i]) &&
 448                     (pdpte[i] & vcpu->arch.mmu.rsvd_bits_mask[0][2])) {
 449                         ret = 0;
 450                         goto out;
 451                 }
 452         }
 453         ret = 1;
 454
 455         memcpy(mmu->pdptrs, pdpte, sizeof(mmu->pdptrs));
 456         __set_bit(VCPU_EXREG_PDPTR,
 457                   (unsigned long *)&vcpu->arch.regs_avail);
 458         __set_bit(VCPU_EXREG_PDPTR,
 459                   (unsigned long *)&vcpu->arch.regs_dirty);
 460 out:
 461
 462         return ret;
 463 }
 464 EXPORT_SYMBOL_GPL(load_pdptrs);
 465
 466 static bool pdptrs_changed(struct kvm_vcpu *vcpu)
 467 {
 468         u64 pdpte[ARRAY_SIZE(vcpu->arch.walk_mmu->pdptrs)];
 469         bool changed = true;
 470         int offset;
 471         gfn_t gfn;
 472         int r;
 473
 474         if (is_long_mode(vcpu) || !is_pae(vcpu))
 475                 return false;
 476
 477         if (!test_bit(VCPU_EXREG_PDPTR,
 478                       (unsigned long *)&vcpu->arch.regs_avail))
 479                 return true;
 480
 481         gfn = (kvm_read_cr3(vcpu) & ~31u) >> PAGE_SHIFT;
 482         offset = (kvm_read_cr3(vcpu) & ~31u) & (PAGE_SIZE - 1);
 483         r = kvm_read_nested_guest_page(vcpu, gfn, pdpte, offset, sizeof(pdpte),
 484                                        PFERR_USER_MASK | PFERR_WRITE_MASK);
 485         if (r < 0)
 486                 goto out;
 487         changed = memcmp(pdpte, vcpu->arch.walk_mmu->pdptrs, sizeof(pdpte)) != 0;
 488 out:
 489
 490         return changed;
 491 }
 492
 493 int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 494 {
 495         unsigned long old_cr0 = kvm_read_cr0(vcpu);
 496         unsigned long update_bits = X86_CR0_PG | X86_CR0_WP |
 497                                     X86_CR0_CD | X86_CR0_NW;
 498
 499         cr0 |= X86_CR0_ET;
 500
 501 #ifdef CONFIG_X86_64
 502         if (cr0 & 0xffffffff00000000UL)
 503                 return 1;
 504 #endif
 505
 506         cr0 &= ~CR0_RESERVED_BITS;
 507
 508         if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD))
 509                 return 1;
 510
 511         if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE))
 512                 return 1;
 513
 514         if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
 515 #ifdef CONFIG_X86_64
 516                 if ((vcpu->arch.efer & EFER_LME)) {
 517                         int cs_db, cs_l;
 518
 519                         if (!is_pae(vcpu))
 520                                 return 1;
 521                         kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
 522                         if (cs_l)
 523                                 return 1;
 524                 } else
 525 #endif
 526                 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->arch.walk_mmu,
 527                                                  kvm_read_cr3(vcpu)))
 528                         return 1;
 529         }
 530
 531         kvm_x86_ops->set_cr0(vcpu, cr0);
 532
 533         if ((cr0 ^ old_cr0) & X86_CR0_PG) {
 534                 kvm_clear_async_pf_completion_queue(vcpu);
 535                 kvm_async_pf_hash_reset(vcpu);
 536         }
 537
 538         if ((cr0 ^ old_cr0) & update_bits)
 539                 kvm_mmu_reset_context(vcpu);
 540         return 0;
 541 }
 542 EXPORT_SYMBOL_GPL(kvm_set_cr0);
 543
 544 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
 545 {
 546         (void)kvm_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~0x0eul) | (msw & 0x0f));
 547 }
 548 EXPORT_SYMBOL_GPL(kvm_lmsw);
 549
 550 int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
 551 {
 552         u64 xcr0;
 553
 554         /* Only support XCR_XFEATURE_ENABLED_MASK(xcr0) now  */
 555         if (index != XCR_XFEATURE_ENABLED_MASK)
 556                 return 1;
 557         xcr0 = xcr;
 558         if (kvm_x86_ops->get_cpl(vcpu) != 0)
 559                 return 1;
 560         if (!(xcr0 & XSTATE_FP))
 561                 return 1;
 562         if ((xcr0 & XSTATE_YMM) && !(xcr0 & XSTATE_SSE))
 563                 return 1;
 564         if (xcr0 & ~host_xcr0)
 565                 return 1;
 566         vcpu->arch.xcr0 = xcr0;
 567         vcpu->guest_xcr0_loaded = 0;
 568         return 0;
 569 }
 570
 571 int kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
 572 {
 573         if (__kvm_set_xcr(vcpu, index, xcr)) {
 574                 kvm_inject_gp(vcpu, 0);
 575                 return 1;
 576         }
 577         return 0;
 578 }
 579 EXPORT_SYMBOL_GPL(kvm_set_xcr);
 580
 581 int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
 582 {
 583         unsigned long old_cr4 = kvm_read_cr4(vcpu);
 584         unsigned long pdptr_bits = X86_CR4_PGE | X86_CR4_PSE |
 585                                    X86_CR4_PAE | X86_CR4_SMEP;
 586         if (cr4 & CR4_RESERVED_BITS)
 587                 return 1;
 588
 589         if (!guest_cpuid_has_xsave(vcpu) && (cr4 & X86_CR4_OSXSAVE))
 590                 return 1;
 591
 592         if (!guest_cpuid_has_smep(vcpu) && (cr4 & X86_CR4_SMEP))
 593                 return 1;
 594
 595         if (!guest_cpuid_has_fsgsbase(vcpu) && (cr4 & X86_CR4_RDWRGSFS))
 596                 return 1;
 597
 598         if (is_long_mode(vcpu)) {
 599                 if (!(cr4 & X86_CR4_PAE))
 600                         return 1;
 601         } else if (is_paging(vcpu) && (cr4 & X86_CR4_PAE)
 602                    && ((cr4 ^ old_cr4) & pdptr_bits)
 603                    && !load_pdptrs(vcpu, vcpu->arch.walk_mmu,
 604                                    kvm_read_cr3(vcpu)))
 605                 return 1;
 606
 607         if (kvm_x86_ops->set_cr4(vcpu, cr4))
 608                 return 1;
 609
 610         if ((cr4 ^ old_cr4) & pdptr_bits)
 611                 kvm_mmu_reset_context(vcpu);
 612
 613         if ((cr4 ^ old_cr4) & X86_CR4_OSXSAVE)
 614                 kvm_update_cpuid(vcpu);
 615
 616         return 0;
 617 }
 618 EXPORT_SYMBOL_GPL(kvm_set_cr4);
 619
 620 int kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
 621 {
 622         if (cr3 == kvm_read_cr3(vcpu) && !pdptrs_changed(vcpu)) {
 623                 kvm_mmu_sync_roots(vcpu);
 624                 kvm_mmu_flush_tlb(vcpu);
 625                 return 0;
 626         }
 627
 628         if (is_long_mode(vcpu)) {
 629                 if (cr3 & CR3_L_MODE_RESERVED_BITS)
 630                         return 1;
 631         } else {
 632                 if (is_pae(vcpu)) {
 633                         if (cr3 & CR3_PAE_RESERVED_BITS)
 634                                 return 1;
 635                         if (is_paging(vcpu) &&
 636                             !load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3))
 637                                 return 1;
 638                 }
 639                 /*
 640                  * We don't check reserved bits in nonpae mode, because
 641                  * this isn't enforced, and VMware depends on this.
 642                  */
 643         }
 644
 645         /*
 646          * Does the new cr3 value map to physical memory? (Note, we
 647          * catch an invalid cr3 even in real-mode, because it would
 648          * cause trouble later on when we turn on paging anyway.)
 649          *
 650          * A real CPU would silently accept an invalid cr3 and would
 651          * attempt to use it - with largely undefined (and often hard
 652          * to debug) behavior on the guest side.
 653          */
 654         if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
 655                 return 1;
 656         vcpu->arch.cr3 = cr3;
 657         __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail);
 658         vcpu->arch.mmu.new_cr3(vcpu);
 659         return 0;
 660 }
 661 EXPORT_SYMBOL_GPL(kvm_set_cr3);
 662
 663 int kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
 664 {
 665         if (cr8 & CR8_RESERVED_BITS)
 666                 return 1;
 667         if (irqchip_in_kernel(vcpu->kvm))
 668                 kvm_lapic_set_tpr(vcpu, cr8);
 669         else
 670                 vcpu->arch.cr8 = cr8;
 671         return 0;
 672 }
 673 EXPORT_SYMBOL_GPL(kvm_set_cr8);
 674
 675 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu)
 676 {
 677         if (irqchip_in_kernel(vcpu->kvm))
 678                 return kvm_lapic_get_cr8(vcpu);
 679         else
 680                 return vcpu->arch.cr8;
 681 }
 682 EXPORT_SYMBOL_GPL(kvm_get_cr8);
 683
 684 static int __kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
 685 {
 686         switch (dr) {
 687         case 0 ... 3:
 688                 vcpu->arch.db[dr] = val;
 689                 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP))
 690                         vcpu->arch.eff_db[dr] = val;
 691                 break;
 692         case 4:
 693                 if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
 694                         return 1; /* #UD */
 695                 /* fall through */
 696         case 6:
 697                 if (val & 0xffffffff00000000ULL)
 698                         return -1; /* #GP */
 699                 vcpu->arch.dr6 = (val & DR6_VOLATILE) | DR6_FIXED_1;
 700                 break;
 701         case 5:
 702                 if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
 703                         return 1; /* #UD */
 704                 /* fall through */
 705         default: /* 7 */
 706                 if (val & 0xffffffff00000000ULL)
 707                         return -1; /* #GP */
 708                 vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1;
 709                 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) {
 710                         kvm_x86_ops->set_dr7(vcpu, vcpu->arch.dr7);
 711                         vcpu->arch.switch_db_regs = (val & DR7_BP_EN_MASK);
 712                 }
 713                 break;
 714         }
 715
 716         return 0;
 717 }
 718
 719 int kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
 720 {
 721         int res;
 722
 723         res = __kvm_set_dr(vcpu, dr, val);
 724         if (res > 0)
 725                 kvm_queue_exception(vcpu, UD_VECTOR);
 726         else if (res < 0)
 727                 kvm_inject_gp(vcpu, 0);
 728
 729         return res;
 730 }
 731 EXPORT_SYMBOL_GPL(kvm_set_dr);
 732
 733 static int _kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val)
 734 {
 735         switch (dr) {
 736         case 0 ... 3:
 737                 *val = vcpu->arch.db[dr];
 738                 break;
 739         case 4:
 740                 if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
 741                         return 1;
 742                 /* fall through */
 743         case 6:
 744                 *val = vcpu->arch.dr6;
 745                 break;
 746         case 5:
 747                 if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
 748                         return 1;
 749                 /* fall through */
 750         default: /* 7 */
 751                 *val = vcpu->arch.dr7;
 752                 break;
 753         }
 754
 755         return 0;
 756 }
 757
 758 int kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val)
 759 {
 760         if (_kvm_get_dr(vcpu, dr, val)) {
 761                 kvm_queue_exception(vcpu, UD_VECTOR);
 762                 return 1;
 763         }
 764         return 0;
 765 }
 766 EXPORT_SYMBOL_GPL(kvm_get_dr);
 767
 768 bool kvm_rdpmc(struct kvm_vcpu *vcpu)
 769 {
 770         u32 ecx = kvm_register_read(vcpu, VCPU_REGS_RCX);
 771         u64 data;
 772         int err;
 773
 774         err = kvm_pmu_read_pmc(vcpu, ecx, &data);
 775         if (err)
 776                 return err;
 777         kvm_register_write(vcpu, VCPU_REGS_RAX, (u32)data);
 778         kvm_register_write(vcpu, VCPU_REGS_RDX, data >> 32);
 779         return err;
 780 }
 781 EXPORT_SYMBOL_GPL(kvm_rdpmc);
 782
 783 /*
 784  * List of msr numbers which we expose to userspace through KVM_GET_MSRS
 785  * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
 786  *
 787  * This list is modified at module load time to reflect the
 788  * capabilities of the host cpu. This capabilities test skips MSRs that are
 789  * kvm-specific. Those are put in the beginning of the list.
 790  */
 791
 792 #define KVM_SAVE_MSRS_BEGIN     9
 793 static u32 msrs_to_save[] = {
 794         MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK,
 795         MSR_KVM_SYSTEM_TIME_NEW, MSR_KVM_WALL_CLOCK_NEW,
 796         HV_X64_MSR_GUEST_OS_ID, HV_X64_MSR_HYPERCALL,
 797         HV_X64_MSR_APIC_ASSIST_PAGE, MSR_KVM_ASYNC_PF_EN, MSR_KVM_STEAL_TIME,
 798         MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
 799         MSR_STAR,
 800 #ifdef CONFIG_X86_64
 801         MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
 802 #endif
 803         MSR_IA32_TSC, MSR_IA32_CR_PAT, MSR_VM_HSAVE_PA
 804 };
 805
 806 static unsigned num_msrs_to_save;
 807
 808 static u32 emulated_msrs[] = {
 809         MSR_IA32_TSCDEADLINE,
 810         MSR_IA32_MISC_ENABLE,
 811         MSR_IA32_MCG_STATUS,
 812         MSR_IA32_MCG_CTL,
 813 };
 814
 815 static int set_efer(struct kvm_vcpu *vcpu, u64 efer)
 816 {
 817         u64 old_efer = vcpu->arch.efer;
 818
 819         if (efer & efer_reserved_bits)
 820                 return 1;
 821
 822         if (is_paging(vcpu)
 823             && (vcpu->arch.efer & EFER_LME) != (efer & EFER_LME))
 824                 return 1;
 825
 826         if (efer & EFER_FFXSR) {
 827                 struct kvm_cpuid_entry2 *feat;
 828
 829                 feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
 830                 if (!feat || !(feat->edx & bit(X86_FEATURE_FXSR_OPT)))
 831                         return 1;
 832         }
 833
 834         if (efer & EFER_SVME) {
 835                 struct kvm_cpuid_entry2 *feat;
 836
 837                 feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
 838                 if (!feat || !(feat->ecx & bit(X86_FEATURE_SVM)))
 839                         return 1;
 840         }
 841
 842         efer &= ~EFER_LMA;
 843         efer |= vcpu->arch.efer & EFER_LMA;
 844
 845         kvm_x86_ops->set_efer(vcpu, efer);
 846
 847         vcpu->arch.mmu.base_role.nxe = (efer & EFER_NX) && !tdp_enabled;
 848
 849         /* Update reserved bits */
 850         if ((efer ^ old_efer) & EFER_NX)
 851                 kvm_mmu_reset_context(vcpu);
 852
 853         return 0;
 854 }
 855
 856 void kvm_enable_efer_bits(u64 mask)
 857 {
 858        efer_reserved_bits &= ~mask;
 859 }
 860 EXPORT_SYMBOL_GPL(kvm_enable_efer_bits);
 861
 862
 863 /*
 864  * Writes msr value into into the appropriate "register".
 865  * Returns 0 on success, non-0 otherwise.
 866  * Assumes vcpu_load() was already called.
 867  */
 868 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
 869 {
 870         return kvm_x86_ops->set_msr(vcpu, msr_index, data);
 871 }
 872
 873 /*
 874  * Adapt set_msr() to msr_io()'s calling convention
 875  */
 876 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
 877 {
 878         return kvm_set_msr(vcpu, index, *data);
 879 }
 880
 881 static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock)
 882 {
 883         int version;
 884         int r;
 885         struct pvclock_wall_clock wc;
 886         struct timespec boot;
 887
 888         if (!wall_clock)
 889                 return;
 890
 891         r = kvm_read_guest(kvm, wall_clock, &version, sizeof(version));
 892         if (r)
 893                 return;
 894
 895         if (version & 1)
 896                 ++version;  /* first time write, random junk */
 897
 898         ++version;
 899
 900         kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
 901
 902         /*
 903          * The guest calculates current wall clock time by adding
 904          * system time (updated by kvm_guest_time_update below) to the
 905          * wall clock specified here.  guest system time equals host
 906          * system time for us, thus we must fill in host boot time here.
 907          */
 908         getboottime(&boot);
 909
 910         wc.sec = boot.tv_sec;
 911         wc.nsec = boot.tv_nsec;
 912         wc.version = version;
 913
 914         kvm_write_guest(kvm, wall_clock, &wc, sizeof(wc));
 915
 916         version++;
 917         kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
 918 }
 919
 920 static uint32_t div_frac(uint32_t dividend, uint32_t divisor)
 921 {
 922         uint32_t quotient, remainder;
 923
 924         /* Don't try to replace with do_div(), this one calculates
 925          * "(dividend << 32) / divisor" */
 926         __asm__ ( "divl %4"
 927                   : "=a" (quotient), "=d" (remainder)
 928                   : "0" (0), "1" (dividend), "r" (divisor) );
 929         return quotient;
 930 }
 931
 932 static void kvm_get_time_scale(uint32_t scaled_khz, uint32_t base_khz,
 933                                s8 *pshift, u32 *pmultiplier)
 934 {
 935         uint64_t scaled64;
 936         int32_t  shift = 0;
 937         uint64_t tps64;
 938         uint32_t tps32;
 939
 940         tps64 = base_khz * 1000LL;
 941         scaled64 = scaled_khz * 1000LL;
 942         while (tps64 > scaled64*2 || tps64 & 0xffffffff00000000ULL) {
 943                 tps64 >>= 1;
 944                 shift--;
 945         }
 946
 947         tps32 = (uint32_t)tps64;
 948         while (tps32 <= scaled64 || scaled64 & 0xffffffff00000000ULL) {
 949                 if (scaled64 & 0xffffffff00000000ULL || tps32 & 0x80000000)
 950                         scaled64 >>= 1;
 951                 else
 952                         tps32 <<= 1;
 953                 shift++;
 954         }
 955
 956         *pshift = shift;
 957         *pmultiplier = div_frac(scaled64, tps32);
 958
 959         pr_debug("%s: base_khz %u => %u, shift %d, mul %u\n",
 960                  __func__, base_khz, scaled_khz, shift, *pmultiplier);
 961 }
 962
 963 static inline u64 get_kernel_ns(void)
 964 {
 965         struct timespec ts;
 966
 967         WARN_ON(preemptible());
 968         ktime_get_ts(&ts);
 969         monotonic_to_bootbased(&ts);
 970         return timespec_to_ns(&ts);
 971 }
 972
 973 static DEFINE_PER_CPU(unsigned long, cpu_tsc_khz);
 974 unsigned long max_tsc_khz;
 975
 976 static inline u64 nsec_to_cycles(struct kvm_vcpu *vcpu, u64 nsec)
 977 {
 978         return pvclock_scale_delta(nsec, vcpu->arch.virtual_tsc_mult,
 979                                    vcpu->arch.virtual_tsc_shift);
 980 }
 981
 982 static u32 adjust_tsc_khz(u32 khz, s32 ppm)
 983 {
 984         u64 v = (u64)khz * (1000000 + ppm);
 985         do_div(v, 1000000);
 986         return v;
 987 }
 988
 989 static void kvm_set_tsc_khz(struct kvm_vcpu *vcpu, u32 this_tsc_khz)
 990 {
 991         u32 thresh_lo, thresh_hi;
 992         int use_scaling = 0;
 993
 994         /* Compute a scale to convert nanoseconds in TSC cycles */
 995         kvm_get_time_scale(this_tsc_khz, NSEC_PER_SEC / 1000,
 996                            &vcpu->arch.virtual_tsc_shift,
 997                            &vcpu->arch.virtual_tsc_mult);
 998         vcpu->arch.virtual_tsc_khz = this_tsc_khz;
 999
1000         /*
1001          * Compute the variation in TSC rate which is acceptable
1002          * within the range of tolerance and decide if the
1003          * rate being applied is within that bounds of the hardware
1004          * rate.  If so, no scaling or compensation need be done.
1005          */
1006         thresh_lo = adjust_tsc_khz(tsc_khz, -tsc_tolerance_ppm);
1007         thresh_hi = adjust_tsc_khz(tsc_khz, tsc_tolerance_ppm);
1008         if (this_tsc_khz < thresh_lo || this_tsc_khz > thresh_hi) {
1009                 pr_debug("kvm: requested TSC rate %u falls outside tolerance [%u,%u]\n", this_tsc_khz, thresh_lo, thresh_hi);
1010                 use_scaling = 1;
1011         }
1012         kvm_x86_ops->set_tsc_khz(vcpu, this_tsc_khz, use_scaling);
1013 }
1014
1015 static u64 compute_guest_tsc(struct kvm_vcpu *vcpu, s64 kernel_ns)
1016 {
1017         u64 tsc = pvclock_scale_delta(kernel_ns-vcpu->arch.this_tsc_nsec,
1018                                       vcpu->arch.virtual_tsc_mult,
1019                                       vcpu->arch.virtual_tsc_shift);
1020         tsc += vcpu->arch.this_tsc_write;
1021         return tsc;
1022 }
1023
1024 void kvm_write_tsc(struct kvm_vcpu *vcpu, u64 data)
1025 {
1026         struct kvm *kvm = vcpu->kvm;
1027         u64 offset, ns, elapsed;
1028         unsigned long flags;
1029         s64 usdiff;
1030
1031         raw_spin_lock_irqsave(&kvm->arch.tsc_write_lock, flags);
1032         offset = kvm_x86_ops->compute_tsc_offset(vcpu, data);
1033         ns = get_kernel_ns();
1034         elapsed = ns - kvm->arch.last_tsc_nsec;
1035
1036         /* n.b - signed multiplication and division required */
1037         usdiff = data - kvm->arch.last_tsc_write;
1038 #ifdef CONFIG_X86_64
1039         usdiff = (usdiff * 1000) / vcpu->arch.virtual_tsc_khz;
1040 #else
1041         /* do_div() only does unsigned */
1042         asm("idivl %2; xor %%edx, %%edx"
1043             : "=A"(usdiff)
1044             : "A"(usdiff * 1000), "rm"(vcpu->arch.virtual_tsc_khz));
1045 #endif
1046         do_div(elapsed, 1000);
1047         usdiff -= elapsed;
1048         if (usdiff < 0)
1049                 usdiff = -usdiff;
1050
1051         /*
1052          * Special case: TSC write with a small delta (1 second) of virtual
1053          * cycle time against real time is interpreted as an attempt to
1054          * synchronize the CPU.
1055          *
1056          * For a reliable TSC, we can match TSC offsets, and for an unstable
1057          * TSC, we add elapsed time in this computation.  We could let the
1058          * compensation code attempt to catch up if we fall behind, but
1059          * it's better to try to match offsets from the beginning.
1060          */
1061         if (usdiff < USEC_PER_SEC &&
1062             vcpu->arch.virtual_tsc_khz == kvm->arch.last_tsc_khz) {
1063                 if (!check_tsc_unstable()) {
1064                         offset = kvm->arch.cur_tsc_offset;
1065                         pr_debug("kvm: matched tsc offset for %llu\n", data);
1066                 } else {
1067                         u64 delta = nsec_to_cycles(vcpu, elapsed);
1068                         data += delta;
1069                         offset = kvm_x86_ops->compute_tsc_offset(vcpu, data);
1070                         pr_debug("kvm: adjusted tsc offset by %llu\n", delta);
1071                 }
1072         } else {
1073                 /*
1074                  * We split periods of matched TSC writes into generations.
1075                  * For each generation, we track the original measured
1076                  * nanosecond time, offset, and write, so if TSCs are in
1077                  * sync, we can match exact offset, and if not, we can match
1078                  * exact software computaion in compute_guest_tsc()
1079                  *
1080                  * These values are tracked in kvm->arch.cur_xxx variables.
1081                  */
1082                 kvm->arch.cur_tsc_generation++;
1083                 kvm->arch.cur_tsc_nsec = ns;
1084                 kvm->arch.cur_tsc_write = data;
1085                 kvm->arch.cur_tsc_offset = offset;
1086                 pr_debug("kvm: new tsc generation %u, clock %llu\n",
1087                          kvm->arch.cur_tsc_generation, data);
1088         }
1089
1090         /*
1091          * We also track th most recent recorded KHZ, write and time to
1092          * allow the matching interval to be extended at each write.
1093          */
1094         kvm->arch.last_tsc_nsec = ns;
1095         kvm->arch.last_tsc_write = data;
1096         kvm->arch.last_tsc_khz = vcpu->arch.virtual_tsc_khz;
1097
1098         /* Reset of TSC must disable overshoot protection below */
1099         vcpu->arch.hv_clock.tsc_timestamp = 0;
1100         vcpu->arch.last_guest_tsc = data;
1101
1102         /* Keep track of which generation this VCPU has synchronized to */
1103         vcpu->arch.this_tsc_generation = kvm->arch.cur_tsc_generation;
1104         vcpu->arch.this_tsc_nsec = kvm->arch.cur_tsc_nsec;
1105         vcpu->arch.this_tsc_write = kvm->arch.cur_tsc_write;
1106
1107         kvm_x86_ops->write_tsc_offset(vcpu, offset);
1108         raw_spin_unlock_irqrestore(&kvm->arch.tsc_write_lock, flags);
1109 }
1110
1111 EXPORT_SYMBOL_GPL(kvm_write_tsc);
1112
1113 static int kvm_guest_time_update(struct kvm_vcpu *v)
1114 {
1115         unsigned long flags;
1116         struct kvm_vcpu_arch *vcpu = &v->arch;
1117         void *shared_kaddr;
1118         unsigned long this_tsc_khz;
1119         s64 kernel_ns, max_kernel_ns;
1120         u64 tsc_timestamp;
1121
1122         /* Keep irq disabled to prevent changes to the clock */
1123         local_irq_save(flags);
1124         tsc_timestamp = kvm_x86_ops->read_l1_tsc(v);
1125         kernel_ns = get_kernel_ns();
1126         this_tsc_khz = __get_cpu_var(cpu_tsc_khz);
1127         if (unlikely(this_tsc_khz == 0)) {
1128                 local_irq_restore(flags);
1129                 kvm_make_request(KVM_REQ_CLOCK_UPDATE, v);
1130                 return 1;
1131         }
1132
1133         /*
1134          * We may have to catch up the TSC to match elapsed wall clock
1135          * time for two reasons, even if kvmclock is used.
1136          *   1) CPU could have been running below the maximum TSC rate
1137          *   2) Broken TSC compensation resets the base at each VCPU
1138          *      entry to avoid unknown leaps of TSC even when running
1139          *      again on the same CPU.  This may cause apparent elapsed
1140          *      time to disappear, and the guest to stand still or run
1141          *      very slowly.
1142          */
1143         if (vcpu->tsc_catchup) {
1144                 u64 tsc = compute_guest_tsc(v, kernel_ns);
1145                 if (tsc > tsc_timestamp) {
1146                         adjust_tsc_offset_guest(v, tsc - tsc_timestamp);
1147                         tsc_timestamp = tsc;
1148                 }
1149         }
1150
1151         local_irq_restore(flags);
1152
1153         if (!vcpu->time_page)
1154                 return 0;
1155
1156         /*
1157          * Time as measured by the TSC may go backwards when resetting the base
1158          * tsc_timestamp.  The reason for this is that the TSC resolution is
1159          * higher than the resolution of the other clock scales.  Thus, many
1160          * possible measurments of the TSC correspond to one measurement of any
1161          * other clock, and so a spread of values is possible.  This is not a
1162          * problem for the computation of the nanosecond clock; with TSC rates
1163          * around 1GHZ, there can only be a few cycles which correspond to one
1164          * nanosecond value, and any path through this code will inevitably
1165          * take longer than that.  However, with the kernel_ns value itself,
1166          * the precision may be much lower, down to HZ granularity.  If the
1167          * first sampling of TSC against kernel_ns ends in the low part of the
1168          * range, and the second in the high end of the range, we can get:
1169          *
1170          * (TSC - offset_low) * S + kns_old > (TSC - offset_high) * S + kns_new
1171          *
1172          * As the sampling errors potentially range in the thousands of cycles,
1173          * it is possible such a time value has already been observed by the
1174          * guest.  To protect against this, we must compute the system time as
1175          * observed by the guest and ensure the new system time is greater.
1176          */
1177         max_kernel_ns = 0;
1178         if (vcpu->hv_clock.tsc_timestamp) {
1179                 max_kernel_ns = vcpu->last_guest_tsc -
1180                                 vcpu->hv_clock.tsc_timestamp;
1181                 max_kernel_ns = pvclock_scale_delta(max_kernel_ns,
1182                                     vcpu->hv_clock.tsc_to_system_mul,
1183                                     vcpu->hv_clock.tsc_shift);
1184                 max_kernel_ns += vcpu->last_kernel_ns;
1185         }
1186
1187         if (unlikely(vcpu->hw_tsc_khz != this_tsc_khz)) {
1188                 kvm_get_time_scale(NSEC_PER_SEC / 1000, this_tsc_khz,
1189                                    &vcpu->hv_clock.tsc_shift,
1190                                    &vcpu->hv_clock.tsc_to_system_mul);
1191                 vcpu->hw_tsc_khz = this_tsc_khz;
1192         }
1193
1194         if (max_kernel_ns > kernel_ns)
1195                 kernel_ns = max_kernel_ns;
1196
1197         /* With all the info we got, fill in the values */
1198         vcpu->hv_clock.tsc_timestamp = tsc_timestamp;
1199         vcpu->hv_clock.system_time = kernel_ns + v->kvm->arch.kvmclock_offset;
1200         vcpu->last_kernel_ns = kernel_ns;
1201         vcpu->last_guest_tsc = tsc_timestamp;
1202         vcpu->hv_clock.flags = 0;
1203
1204         /*
1205          * The interface expects us to write an even number signaling that the
1206          * update is finished. Since the guest won't see the intermediate
1207          * state, we just increase by 2 at the end.
1208          */
1209         vcpu->hv_clock.version += 2;
1210
1211         shared_kaddr = kmap_atomic(vcpu->time_page);
1212
1213         memcpy(shared_kaddr + vcpu->time_offset, &vcpu->hv_clock,
1214                sizeof(vcpu->hv_clock));
1215
1216         kunmap_atomic(shared_kaddr);
1217
1218         mark_page_dirty(v->kvm, vcpu->time >> PAGE_SHIFT);
1219         return 0;
1220 }
1221
1222 static bool msr_mtrr_valid(unsigned msr)
1223 {
1224         switch (msr) {
1225         case 0x200 ... 0x200 + 2 * KVM_NR_VAR_MTRR - 1:
1226         case MSR_MTRRfix64K_00000:
1227         case MSR_MTRRfix16K_80000:
1228         case MSR_MTRRfix16K_A0000:
1229         case MSR_MTRRfix4K_C0000:
1230         case MSR_MTRRfix4K_C8000:
1231         case MSR_MTRRfix4K_D0000:
1232         case MSR_MTRRfix4K_D8000:
1233         case MSR_MTRRfix4K_E0000:
1234         case MSR_MTRRfix4K_E8000:
1235         case MSR_MTRRfix4K_F0000:
1236         case MSR_MTRRfix4K_F8000:
1237         case MSR_MTRRdefType:
1238         case MSR_IA32_CR_PAT:
1239                 return true;
1240         case 0x2f8:
1241                 return true;
1242         }
1243         return false;
1244 }
1245
1246 static bool valid_pat_type(unsigned t)
1247 {
1248         return t < 8 && (1 << t) & 0xf3; /* 0, 1, 4, 5, 6, 7 */
1249 }
1250
1251 static bool valid_mtrr_type(unsigned t)
1252 {
1253         return t < 8 && (1 << t) & 0x73; /* 0, 1, 4, 5, 6 */
1254 }
1255
1256 static bool mtrr_valid(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1257 {
1258         int i;
1259
1260         if (!msr_mtrr_valid(msr))
1261                 return false;
1262
1263         if (msr == MSR_IA32_CR_PAT) {
1264                 for (i = 0; i < 8; i++)
1265                         if (!valid_pat_type((data >> (i * 8)) & 0xff))
1266                                 return false;
1267                 return true;
1268         } else if (msr == MSR_MTRRdefType) {
1269                 if (data & ~0xcff)
1270                         return false;
1271                 return valid_mtrr_type(data & 0xff);
1272         } else if (msr >= MSR_MTRRfix64K_00000 && msr <= MSR_MTRRfix4K_F8000) {
1273                 for (i = 0; i < 8 ; i++)
1274                         if (!valid_mtrr_type((data >> (i * 8)) & 0xff))
1275                                 return false;
1276                 return true;
1277         }
1278
1279         /* variable MTRRs */
1280         return valid_mtrr_type(data & 0xff);
1281 }
1282
1283 static int set_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1284 {
1285         u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges;
1286
1287         if (!mtrr_valid(vcpu, msr, data))
1288                 return 1;
1289
1290         if (msr == MSR_MTRRdefType) {
1291                 vcpu->arch.mtrr_state.def_type = data;
1292                 vcpu->arch.mtrr_state.enabled = (data & 0xc00) >> 10;
1293         } else if (msr == MSR_MTRRfix64K_00000)
1294                 p[0] = data;
1295         else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000)
1296                 p[1 + msr - MSR_MTRRfix16K_80000] = data;
1297         else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000)
1298                 p[3 + msr - MSR_MTRRfix4K_C0000] = data;
1299         else if (msr == MSR_IA32_CR_PAT)
1300                 vcpu->arch.pat = data;
1301         else {  /* Variable MTRRs */
1302                 int idx, is_mtrr_mask;
1303                 u64 *pt;
1304
1305                 idx = (msr - 0x200) / 2;
1306                 is_mtrr_mask = msr - 0x200 - 2 * idx;
1307                 if (!is_mtrr_mask)
1308                         pt =
1309                           (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo;
1310                 else
1311                         pt =
1312                           (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo;
1313                 *pt = data;
1314         }
1315
1316         kvm_mmu_reset_context(vcpu);
1317         return 0;
1318 }
1319
1320 static int set_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1321 {
1322         u64 mcg_cap = vcpu->arch.mcg_cap;
1323         unsigned bank_num = mcg_cap & 0xff;
1324
1325         switch (msr) {
1326         case MSR_IA32_MCG_STATUS:
1327                 vcpu->arch.mcg_status = data;
1328                 break;
1329         case MSR_IA32_MCG_CTL:
1330                 if (!(mcg_cap & MCG_CTL_P))
1331                         return 1;
1332                 if (data != 0 && data != ~(u64)0)
1333                         return -1;
1334                 vcpu->arch.mcg_ctl = data;
1335                 break;
1336         default:
1337                 if (msr >= MSR_IA32_MC0_CTL &&
1338                     msr < MSR_IA32_MC0_CTL + 4 * bank_num) {
1339                         u32 offset = msr - MSR_IA32_MC0_CTL;
1340                         /* only 0 or all 1s can be written to IA32_MCi_CTL
1341                          * some Linux kernels though clear bit 10 in bank 4 to
1342                          * workaround a BIOS/GART TBL issue on AMD K8s, ignore
1343                          * this to avoid an uncatched #GP in the guest
1344                          */
1345                         if ((offset & 0x3) == 0 &&
1346                             data != 0 && (data | (1 << 10)) != ~(u64)0)
1347                                 return -1;
1348                         vcpu->arch.mce_banks[offset] = data;
1349                         break;
1350                 }
1351                 return 1;
1352         }
1353         return 0;
1354 }
1355
1356 static int xen_hvm_config(struct kvm_vcpu *vcpu, u64 data)
1357 {
1358         struct kvm *kvm = vcpu->kvm;
1359         int lm = is_long_mode(vcpu);
1360         u8 *blob_addr = lm ? (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_64
1361                 : (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_32;
1362         u8 blob_size = lm ? kvm->arch.xen_hvm_config.blob_size_64
1363                 : kvm->arch.xen_hvm_config.blob_size_32;
1364         u32 page_num = data & ~PAGE_MASK;
1365         u64 page_addr = data & PAGE_MASK;
1366         u8 *page;
1367         int r;
1368
1369         r = -E2BIG;
1370         if (page_num >= blob_size)
1371                 goto out;
1372         r = -ENOMEM;
1373         page = memdup_user(blob_addr + (page_num * PAGE_SIZE), PAGE_SIZE);
1374         if (IS_ERR(page)) {
1375                 r = PTR_ERR(page);
1376                 goto out;
1377         }
1378         if (kvm_write_guest(kvm, page_addr, page, PAGE_SIZE))
1379                 goto out_free;
1380         r = 0;
1381 out_free:
1382         kfree(page);
1383 out:
1384         return r;
1385 }
1386
1387 static bool kvm_hv_hypercall_enabled(struct kvm *kvm)
1388 {
1389         return kvm->arch.hv_hypercall & HV_X64_MSR_HYPERCALL_ENABLE;
1390 }
1391
1392 static bool kvm_hv_msr_partition_wide(u32 msr)
1393 {
1394         bool r = false;
1395         switch (msr) {
1396         case HV_X64_MSR_GUEST_OS_ID:
1397         case HV_X64_MSR_HYPERCALL:
1398                 r = true;
1399                 break;
1400         }
1401
1402         return r;
1403 }
1404
1405 static int set_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1406 {
1407         struct kvm *kvm = vcpu->kvm;
1408
1409         switch (msr) {
1410         case HV_X64_MSR_GUEST_OS_ID:
1411                 kvm->arch.hv_guest_os_id = data;
1412                 /* setting guest os id to zero disables hypercall page */
1413                 if (!kvm->arch.hv_guest_os_id)
1414                         kvm->arch.hv_hypercall &= ~HV_X64_MSR_HYPERCALL_ENABLE;
1415                 break;
1416         case HV_X64_MSR_HYPERCALL: {
1417                 u64 gfn;
1418                 unsigned long addr;
1419                 u8 instructions[4];
1420
1421                 /* if guest os id is not set hypercall should remain disabled */
1422                 if (!kvm->arch.hv_guest_os_id)
1423                         break;
1424                 if (!(data & HV_X64_MSR_HYPERCALL_ENABLE)) {
1425                         kvm->arch.hv_hypercall = data;
1426                         break;
1427                 }
1428                 gfn = data >> HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT;
1429                 addr = gfn_to_hva(kvm, gfn);
1430                 if (kvm_is_error_hva(addr))
1431                         return 1;
1432                 kvm_x86_ops->patch_hypercall(vcpu, instructions);
1433                 ((unsigned char *)instructions)[3] = 0xc3; /* ret */
1434                 if (__copy_to_user((void __user *)addr, instructions, 4))
1435                         return 1;
1436                 kvm->arch.hv_hypercall = data;
1437                 break;
1438         }
1439         default:
1440                 pr_unimpl(vcpu, "HYPER-V unimplemented wrmsr: 0x%x "
1441                           "data 0x%llx\n", msr, data);
1442                 return 1;
1443         }
1444         return 0;
1445 }
1446
1447 static int set_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1448 {
1449         switch (msr) {
1450         case HV_X64_MSR_APIC_ASSIST_PAGE: {
1451                 unsigned long addr;
1452
1453                 if (!(data & HV_X64_MSR_APIC_ASSIST_PAGE_ENABLE)) {
1454                         vcpu->arch.hv_vapic = data;
1455                         break;
1456                 }
1457                 addr = gfn_to_hva(vcpu->kvm, data >>
1458                                   HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT);
1459                 if (kvm_is_error_hva(addr))
1460                         return 1;
1461                 if (__clear_user((void __user *)addr, PAGE_SIZE))
1462                         return 1;
1463                 vcpu->arch.hv_vapic = data;
1464                 break;
1465         }
1466         case HV_X64_MSR_EOI:
1467                 return kvm_hv_vapic_msr_write(vcpu, APIC_EOI, data);
1468         case HV_X64_MSR_ICR:
1469                 return kvm_hv_vapic_msr_write(vcpu, APIC_ICR, data);
1470         case HV_X64_MSR_TPR:
1471                 return kvm_hv_vapic_msr_write(vcpu, APIC_TASKPRI, data);
1472         default:
1473                 pr_unimpl(vcpu, "HYPER-V unimplemented wrmsr: 0x%x "
1474                           "data 0x%llx\n", msr, data);
1475                 return 1;
1476         }
1477
1478         return 0;
1479 }
1480
1481 static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data)
1482 {
1483         gpa_t gpa = data & ~0x3f;
1484
1485         /* Bits 2:5 are resrved, Should be zero */
1486         if (data & 0x3c)
1487                 return 1;
1488
1489         vcpu->arch.apf.msr_val = data;
1490
1491         if (!(data & KVM_ASYNC_PF_ENABLED)) {
1492                 kvm_clear_async_pf_completion_queue(vcpu);
1493                 kvm_async_pf_hash_reset(vcpu);
1494                 return 0;
1495         }
1496
1497         if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.apf.data, gpa))
1498                 return 1;
1499
1500         vcpu->arch.apf.send_user_only = !(data & KVM_ASYNC_PF_SEND_ALWAYS);
1501         kvm_async_pf_wakeup_all(vcpu);
1502         return 0;
1503 }
1504
1505 static void kvmclock_reset(struct kvm_vcpu *vcpu)
1506 {
1507         if (vcpu->arch.time_page) {
1508                 kvm_release_page_dirty(vcpu->arch.time_page);
1509                 vcpu->arch.time_page = NULL;
1510         }
1511 }
1512
1513 static void accumulate_steal_time(struct kvm_vcpu *vcpu)
1514 {
1515         u64 delta;
1516
1517         if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED))
1518                 return;
1519
1520         delta = current->sched_info.run_delay - vcpu->arch.st.last_steal;
1521         vcpu->arch.st.last_steal = current->sched_info.run_delay;
1522         vcpu->arch.st.accum_steal = delta;
1523 }
1524
1525 static void record_steal_time(struct kvm_vcpu *vcpu)
1526 {
1527         if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED))
1528                 return;
1529
1530         if (unlikely(kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.st.stime,
1531                 &vcpu->arch.st.steal, sizeof(struct kvm_steal_time))))
1532                 return;
1533
1534         vcpu->arch.st.steal.steal += vcpu->arch.st.accum_steal;
1535         vcpu->arch.st.steal.version += 2;
1536         vcpu->arch.st.accum_steal = 0;
1537
1538         kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.st.stime,
1539                 &vcpu->arch.st.steal, sizeof(struct kvm_steal_time));
1540 }
1541
1542 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1543 {
1544         bool pr = false;
1545
1546         switch (msr) {
1547         case MSR_EFER:
1548                 return set_efer(vcpu, data);
1549         case MSR_K7_HWCR:
1550                 data &= ~(u64)0x40;     /* ignore flush filter disable */
1551                 data &= ~(u64)0x100;    /* ignore ignne emulation enable */
1552                 data &= ~(u64)0x8;      /* ignore TLB cache disable */
1553                 if (data != 0) {
1554                         pr_unimpl(vcpu, "unimplemented HWCR wrmsr: 0x%llx\n",
1555                                 data);
1556                         return 1;
1557                 }
1558                 break;
1559         case MSR_FAM10H_MMIO_CONF_BASE:
1560                 if (data != 0) {
1561                         pr_unimpl(vcpu, "unimplemented MMIO_CONF_BASE wrmsr: "
1562                                 "0x%llx\n", data);
1563                         return 1;
1564                 }
1565                 break;
1566         case MSR_AMD64_NB_CFG:
1567                 break;
1568         case MSR_IA32_DEBUGCTLMSR:
1569                 if (!data) {
1570                         /* We support the non-activated case already */
1571                         break;
1572                 } else if (data & ~(DEBUGCTLMSR_LBR | DEBUGCTLMSR_BTF)) {
1573                         /* Values other than LBR and BTF are vendor-specific,
1574                            thus reserved and should throw a #GP */
1575                         return 1;
1576                 }
1577                 pr_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n",
1578                         __func__, data);
1579                 break;
1580         case MSR_IA32_UCODE_REV:
1581         case MSR_IA32_UCODE_WRITE:
1582         case MSR_VM_HSAVE_PA:
1583         case MSR_AMD64_PATCH_LOADER:
1584                 break;
1585         case 0x200 ... 0x2ff:
1586                 return set_msr_mtrr(vcpu, msr, data);
1587         case MSR_IA32_APICBASE:
1588                 kvm_set_apic_base(vcpu, data);
1589                 break;
1590         case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff:
1591                 return kvm_x2apic_msr_write(vcpu, msr, data);
1592         case MSR_IA32_TSCDEADLINE:
1593                 kvm_set_lapic_tscdeadline_msr(vcpu, data);
1594                 break;
1595         case MSR_IA32_MISC_ENABLE:
1596                 vcpu->arch.ia32_misc_enable_msr = data;
1597                 break;
1598         case MSR_KVM_WALL_CLOCK_NEW:
1599         case MSR_KVM_WALL_CLOCK:
1600                 vcpu->kvm->arch.wall_clock = data;
1601                 kvm_write_wall_clock(vcpu->kvm, data);
1602                 break;
1603         case MSR_KVM_SYSTEM_TIME_NEW:
1604         case MSR_KVM_SYSTEM_TIME: {
1605                 kvmclock_reset(vcpu);
1606
1607                 vcpu->arch.time = data;
1608                 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
1609
1610                 /* we verify if the enable bit is set... */
1611                 if (!(data & 1))
1612                         break;
1613
1614                 /* ...but clean it before doing the actual write */
1615                 vcpu->arch.time_offset = data & ~(PAGE_MASK | 1);
1616
1617                 vcpu->arch.time_page =
1618                                 gfn_to_page(vcpu->kvm, data >> PAGE_SHIFT);
1619
1620                 if (is_error_page(vcpu->arch.time_page)) {
1621                         kvm_release_page_clean(vcpu->arch.time_page);
1622                         vcpu->arch.time_page = NULL;
1623                 }
1624                 break;
1625         }
1626         case MSR_KVM_ASYNC_PF_EN:
1627                 if (kvm_pv_enable_async_pf(vcpu, data))
1628                         return 1;
1629                 break;
1630         case MSR_KVM_STEAL_TIME:
1631
1632                 if (unlikely(!sched_info_on()))
1633                         return 1;
1634
1635                 if (data & KVM_STEAL_RESERVED_MASK)
1636                         return 1;
1637
1638                 if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.st.stime,
1639                                                         data & KVM_STEAL_VALID_BITS))
1640                         return 1;
1641
1642                 vcpu->arch.st.msr_val = data;
1643
1644                 if (!(data & KVM_MSR_ENABLED))
1645                         break;
1646
1647                 vcpu->arch.st.last_steal = current->sched_info.run_delay;
1648
1649                 preempt_disable();
1650                 accumulate_steal_time(vcpu);
1651                 preempt_enable();
1652
1653                 kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
1654
1655                 break;
1656
1657         case MSR_IA32_MCG_CTL:
1658         case MSR_IA32_MCG_STATUS:
1659         case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1:
1660                 return set_msr_mce(vcpu, msr, data);
1661
1662         /* Performance counters are not protected by a CPUID bit,
1663          * so we should check all of them in the generic path for the sake of
1664          * cross vendor migration.
1665          * Writing a zero into the event select MSRs disables them,
1666          * which we perfectly emulate ;-). Any other value should be at least
1667          * reported, some guests depend on them.
1668          */
1669         case MSR_K7_EVNTSEL0:
1670         case MSR_K7_EVNTSEL1:
1671         case MSR_K7_EVNTSEL2:
1672         case MSR_K7_EVNTSEL3:
1673                 if (data != 0)
1674                         pr_unimpl(vcpu, "unimplemented perfctr wrmsr: "
1675                                 "0x%x data 0x%llx\n", msr, data);
1676                 break;
1677         /* at least RHEL 4 unconditionally writes to the perfctr registers,
1678          * so we ignore writes to make it happy.
1679          */
1680         case MSR_K7_PERFCTR0:
1681         case MSR_K7_PERFCTR1:
1682         case MSR_K7_PERFCTR2:
1683         case MSR_K7_PERFCTR3:
1684                 pr_unimpl(vcpu, "unimplemented perfctr wrmsr: "
1685                         "0x%x data 0x%llx\n", msr, data);
1686                 break;
1687         case MSR_P6_PERFCTR0:
1688         case MSR_P6_PERFCTR1:
1689                 pr = true;
1690         case MSR_P6_EVNTSEL0:
1691         case MSR_P6_EVNTSEL1:
1692                 if (kvm_pmu_msr(vcpu, msr))
1693                         return kvm_pmu_set_msr(vcpu, msr, data);
1694
1695                 if (pr || data != 0)
1696                         pr_unimpl(vcpu, "disabled perfctr wrmsr: "
1697                                 "0x%x data 0x%llx\n", msr, data);
1698                 break;
1699         case MSR_K7_CLK_CTL:
1700                 /*
1701                  * Ignore all writes to this no longer documented MSR.
1702                  * Writes are only relevant for old K7 processors,
1703                  * all pre-dating SVM, but a recommended workaround from
1704                  * AMD for these chips. It is possible to speicify the
1705                  * affected processor models on the command line, hence
1706                  * the need to ignore the workaround.
1707                  */
1708                 break;
1709         case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
1710                 if (kvm_hv_msr_partition_wide(msr)) {
1711                         int r;
1712                         mutex_lock(&vcpu->kvm->lock);
1713                         r = set_msr_hyperv_pw(vcpu, msr, data);
1714                         mutex_unlock(&vcpu->kvm->lock);
1715                         return r;
1716                 } else
1717                         return set_msr_hyperv(vcpu, msr, data);
1718                 break;
1719         case MSR_IA32_BBL_CR_CTL3:
1720                 /* Drop writes to this legacy MSR -- see rdmsr
1721                  * counterpart for further detail.
1722                  */
1723                 pr_unimpl(vcpu, "ignored wrmsr: 0x%x data %llx\n", msr, data);
1724                 break;
1725         case MSR_AMD64_OSVW_ID_LENGTH:
1726                 if (!guest_cpuid_has_osvw(vcpu))
1727                         return 1;
1728                 vcpu->arch.osvw.length = data;
1729                 break;
1730         case MSR_AMD64_OSVW_STATUS:
1731                 if (!guest_cpuid_has_osvw(vcpu))
1732                         return 1;
1733                 vcpu->arch.osvw.status = data;
1734                 break;
1735         default:
1736                 if (msr && (msr == vcpu->kvm->arch.xen_hvm_config.msr))
1737                         return xen_hvm_config(vcpu, data);
1738                 if (kvm_pmu_msr(vcpu, msr))
1739                         return kvm_pmu_set_msr(vcpu, msr, data);
1740                 if (!ignore_msrs) {
1741                         pr_unimpl(vcpu, "unhandled wrmsr: 0x%x data %llx\n",
1742                                 msr, data);
1743                         return 1;
1744                 } else {
1745                         pr_unimpl(vcpu, "ignored wrmsr: 0x%x data %llx\n",
1746                                 msr, data);
1747                         break;
1748                 }
1749         }
1750         return 0;
1751 }
1752 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1753
1754
1755 /*
1756  * Reads an msr value (of 'msr_index') into 'pdata'.
1757  * Returns 0 on success, non-0 otherwise.
1758  * Assumes vcpu_load() was already called.
1759  */
1760 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1761 {
1762         return kvm_x86_ops->get_msr(vcpu, msr_index, pdata);
1763 }
1764
1765 static int get_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1766 {
1767         u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges;
1768
1769         if (!msr_mtrr_valid(msr))
1770                 return 1;
1771
1772         if (msr == MSR_MTRRdefType)
1773                 *pdata = vcpu->arch.mtrr_state.def_type +
1774                          (vcpu->arch.mtrr_state.enabled << 10);
1775         else if (msr == MSR_MTRRfix64K_00000)
1776                 *pdata = p[0];
1777         else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000)
1778                 *pdata = p[1 + msr - MSR_MTRRfix16K_80000];
1779         else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000)
1780                 *pdata = p[3 + msr - MSR_MTRRfix4K_C0000];
1781         else if (msr == MSR_IA32_CR_PAT)
1782                 *pdata = vcpu->arch.pat;
1783         else {  /* Variable MTRRs */
1784                 int idx, is_mtrr_mask;
1785                 u64 *pt;
1786
1787                 idx = (msr - 0x200) / 2;
1788                 is_mtrr_mask = msr - 0x200 - 2 * idx;
1789                 if (!is_mtrr_mask)
1790                         pt =
1791                           (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo;
1792                 else
1793                         pt =
1794                           (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo;
1795                 *pdata = *pt;
1796         }
1797
1798         return 0;
1799 }
1800
1801 static int get_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1802 {
1803         u64 data;
1804         u64 mcg_cap = vcpu->arch.mcg_cap;
1805         unsigned bank_num = mcg_cap & 0xff;
1806
1807         switch (msr) {
1808         case MSR_IA32_P5_MC_ADDR:
1809         case MSR_IA32_P5_MC_TYPE:
1810                 data = 0;
1811                 break;
1812         case MSR_IA32_MCG_CAP:
1813                 data = vcpu->arch.mcg_cap;
1814                 break;
1815         case MSR_IA32_MCG_CTL:
1816                 if (!(mcg_cap & MCG_CTL_P))
1817                         return 1;
1818                 data = vcpu->arch.mcg_ctl;
1819                 break;
1820         case MSR_IA32_MCG_STATUS:
1821                 data = vcpu->arch.mcg_status;
1822                 break;
1823         default:
1824                 if (msr >= MSR_IA32_MC0_CTL &&
1825                     msr < MSR_IA32_MC0_CTL + 4 * bank_num) {
1826                         u32 offset = msr - MSR_IA32_MC0_CTL;
1827                         data = vcpu->arch.mce_banks[offset];
1828                         break;
1829                 }
1830                 return 1;
1831         }
1832         *pdata = data;
1833         return 0;
1834 }
1835
1836 static int get_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1837 {
1838         u64 data = 0;
1839         struct kvm *kvm = vcpu->kvm;
1840
1841         switch (msr) {
1842         case HV_X64_MSR_GUEST_OS_ID:
1843                 data = kvm->arch.hv_guest_os_id;
1844                 break;
1845         case HV_X64_MSR_HYPERCALL:
1846                 data = kvm->arch.hv_hypercall;
1847                 break;
1848         default:
1849                 pr_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1850                 return 1;
1851         }
1852
1853         *pdata = data;
1854         return 0;
1855 }
1856
1857 static int get_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1858 {
1859         u64 data = 0;
1860
1861         switch (msr) {
1862         case HV_X64_MSR_VP_INDEX: {
1863                 int r;
1864                 struct kvm_vcpu *v;
1865                 kvm_for_each_vcpu(r, v, vcpu->kvm)
1866                         if (v == vcpu)
1867                                 data = r;
1868                 break;
1869         }
1870         case HV_X64_MSR_EOI:
1871                 return kvm_hv_vapic_msr_read(vcpu, APIC_EOI, pdata);
1872         case HV_X64_MSR_ICR:
1873                 return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata);
1874         case HV_X64_MSR_TPR:
1875                 return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata);
1876         case HV_X64_MSR_APIC_ASSIST_PAGE:
1877                 data = vcpu->arch.hv_vapic;
1878                 break;
1879         default:
1880                 pr_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1881                 return 1;
1882         }
1883         *pdata = data;
1884         return 0;
1885 }
1886
1887 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1888 {
1889         u64 data;
1890
1891         switch (msr) {
1892         case MSR_IA32_PLATFORM_ID:
1893         case MSR_IA32_EBL_CR_POWERON:
1894         case MSR_IA32_DEBUGCTLMSR:
1895         case MSR_IA32_LASTBRANCHFROMIP:
1896         case MSR_IA32_LASTBRANCHTOIP:
1897         case MSR_IA32_LASTINTFROMIP:
1898         case MSR_IA32_LASTINTTOIP:
1899         case MSR_K8_SYSCFG:
1900         case MSR_K7_HWCR:
1901         case MSR_VM_HSAVE_PA:
1902         case MSR_K7_EVNTSEL0:
1903         case MSR_K7_PERFCTR0:
1904         case MSR_K8_INT_PENDING_MSG:
1905         case MSR_AMD64_NB_CFG:
1906         case MSR_FAM10H_MMIO_CONF_BASE:
1907                 data = 0;
1908                 break;
1909         case MSR_P6_PERFCTR0:
1910         case MSR_P6_PERFCTR1:
1911         case MSR_P6_EVNTSEL0:
1912         case MSR_P6_EVNTSEL1:
1913                 if (kvm_pmu_msr(vcpu, msr))
1914                         return kvm_pmu_get_msr(vcpu, msr, pdata);
1915                 data = 0;
1916                 break;
1917         case MSR_IA32_UCODE_REV:
1918                 data = 0x100000000ULL;
1919                 break;
1920         case MSR_MTRRcap:
1921                 data = 0x500 | KVM_NR_VAR_MTRR;
1922                 break;
1923         case 0x200 ... 0x2ff:
1924                 return get_msr_mtrr(vcpu, msr, pdata);
1925         case 0xcd: /* fsb frequency */
1926                 data = 3;
1927                 break;
1928                 /*
1929                  * MSR_EBC_FREQUENCY_ID
1930                  * Conservative value valid for even the basic CPU models.
1931                  * Models 0,1: 000 in bits 23:21 indicating a bus speed of
1932                  * 100MHz, model 2 000 in bits 18:16 indicating 100MHz,
1933                  * and 266MHz for model 3, or 4. Set Core Clock
1934                  * Frequency to System Bus Frequency Ratio to 1 (bits
1935                  * 31:24) even though these are only valid for CPU
1936                  * models > 2, however guests may end up dividing or
1937                  * multiplying by zero otherwise.
1938                  */
1939         case MSR_EBC_FREQUENCY_ID:
1940                 data = 1 << 24;
1941                 break;
1942         case MSR_IA32_APICBASE:
1943                 data = kvm_get_apic_base(vcpu);
1944                 break;
1945         case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff:
1946                 return kvm_x2apic_msr_read(vcpu, msr, pdata);
1947                 break;
1948         case MSR_IA32_TSCDEADLINE:
1949                 data = kvm_get_lapic_tscdeadline_msr(vcpu);
1950                 break;
1951         case MSR_IA32_MISC_ENABLE:
1952                 data = vcpu->arch.ia32_misc_enable_msr;
1953                 break;
1954         case MSR_IA32_PERF_STATUS:
1955                 /* TSC increment by tick */
1956                 data = 1000ULL;
1957                 /* CPU multiplier */
1958                 data |= (((uint64_t)4ULL) << 40);
1959                 break;
1960         case MSR_EFER:
1961                 data = vcpu->arch.efer;
1962                 break;
1963         case MSR_KVM_WALL_CLOCK:
1964         case MSR_KVM_WALL_CLOCK_NEW:
1965                 data = vcpu->kvm->arch.wall_clock;
1966                 break;
1967         case MSR_KVM_SYSTEM_TIME:
1968         case MSR_KVM_SYSTEM_TIME_NEW:
1969                 data = vcpu->arch.time;
1970                 break;
1971         case MSR_KVM_ASYNC_PF_EN:
1972                 data = vcpu->arch.apf.msr_val;
1973                 break;
1974         case MSR_KVM_STEAL_TIME:
1975                 data = vcpu->arch.st.msr_val;
1976                 break;
1977         case MSR_IA32_P5_MC_ADDR:
1978         case MSR_IA32_P5_MC_TYPE:
1979         case MSR_IA32_MCG_CAP:
1980         case MSR_IA32_MCG_CTL:
1981         case MSR_IA32_MCG_STATUS:
1982         case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1:
1983                 return get_msr_mce(vcpu, msr, pdata);
1984         case MSR_K7_CLK_CTL:
1985                 /*
1986                  * Provide expected ramp-up count for K7. All other
1987                  * are set to zero, indicating minimum divisors for
1988                  * every field.
1989                  *
1990                  * This prevents guest kernels on AMD host with CPU
1991                  * type 6, model 8 and higher from exploding due to
1992                  * the rdmsr failing.
1993                  */
1994                 data = 0x20000000;
1995                 break;
1996         case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
1997                 if (kvm_hv_msr_partition_wide(msr)) {
1998                         int r;
1999                         mutex_lock(&vcpu->kvm->lock);
2000                         r = get_msr_hyperv_pw(vcpu, msr, pdata);
2001                         mutex_unlock(&vcpu->kvm->lock);
2002                         return r;
2003                 } else
2004                         return get_msr_hyperv(vcpu, msr, pdata);
2005                 break;
2006         case MSR_IA32_BBL_CR_CTL3:
2007                 /* This legacy MSR exists but isn't fully documented in current
2008                  * silicon.  It is however accessed by winxp in very narrow
2009                  * scenarios where it sets bit #19, itself documented as
2010                  * a "reserved" bit.  Best effort attempt to source coherent
2011                  * read data here should the balance of the register be
2012                  * interpreted by the guest:
2013                  *
2014                  * L2 cache control register 3: 64GB range, 256KB size,
2015                  * enabled, latency 0x1, configured
2016                  */
2017                 data = 0xbe702111;
2018                 break;
2019         case MSR_AMD64_OSVW_ID_LENGTH:
2020                 if (!guest_cpuid_has_osvw(vcpu))
2021                         return 1;
2022                 data = vcpu->arch.osvw.length;
2023                 break;
2024         case MSR_AMD64_OSVW_STATUS:
2025                 if (!guest_cpuid_has_osvw(vcpu))
2026                         return 1;
2027                 data = vcpu->arch.osvw.status;
2028                 break;
2029         default:
2030                 if (kvm_pmu_msr(vcpu, msr))
2031                         return kvm_pmu_get_msr(vcpu, msr, pdata);
2032                 if (!ignore_msrs) {
2033                         pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
2034                         return 1;
2035                 } else {
2036                         pr_unimpl(vcpu, "ignored rdmsr: 0x%x\n", msr);
2037                         data = 0;
2038                 }
2039                 break;
2040         }
2041         *pdata = data;
2042         return 0;
2043 }
2044 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
2045
2046 /*
2047  * Read or write a bunch of msrs. All parameters are kernel addresses.
2048  *
2049  * @return number of msrs set successfully.
2050  */
2051 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
2052                     struct kvm_msr_entry *entries,
2053                     int (*do_msr)(struct kvm_vcpu *vcpu,
2054                                   unsigned index, u64 *data))
2055 {
2056         int i, idx;
2057
2058         idx = srcu_read_lock(&vcpu->kvm->srcu);
2059         for (i = 0; i < msrs->nmsrs; ++i)
2060                 if (do_msr(vcpu, entries[i].index, &entries[i].data))
2061                         break;
2062         srcu_read_unlock(&vcpu->kvm->srcu, idx);
2063
2064         return i;
2065 }
2066
2067 /*
2068  * Read or write a bunch of msrs. Parameters are user addresses.
2069  *
2070  * @return number of msrs set successfully.
2071  */
2072 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
2073                   int (*do_msr)(struct kvm_vcpu *vcpu,
2074                                 unsigned index, u64 *data),
2075                   int writeback)
2076 {
2077         struct kvm_msrs msrs;
2078         struct kvm_msr_entry *entries;
2079         int r, n;
2080         unsigned size;
2081
2082         r = -EFAULT;
2083         if (copy_from_user(&msrs, user_msrs, sizeof msrs))
2084                 goto out;
2085
2086         r = -E2BIG;
2087         if (msrs.nmsrs >= MAX_IO_MSRS)
2088                 goto out;
2089
2090         size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
2091         entries = memdup_user(user_msrs->entries, size);
2092         if (IS_ERR(entries)) {
2093                 r = PTR_ERR(entries);
2094                 goto out;
2095         }
2096
2097         r = n = __msr_io(vcpu, &msrs, entries, do_msr);
2098         if (r < 0)
2099                 goto out_free;
2100
2101         r = -EFAULT;
2102         if (writeback && copy_to_user(user_msrs->entries, entries, size))
2103                 goto out_free;
2104
2105         r = n;
2106
2107 out_free:
2108         kfree(entries);
2109 out:
2110         return r;
2111 }
2112
2113 int kvm_dev_ioctl_check_extension(long ext)
2114 {
2115         int r;
2116
2117         switch (ext) {
2118         case KVM_CAP_IRQCHIP:
2119         case KVM_CAP_HLT:
2120         case KVM_CAP_MMU_SHADOW_CACHE_CONTROL:
2121         case KVM_CAP_SET_TSS_ADDR:
2122         case KVM_CAP_EXT_CPUID:
2123         case KVM_CAP_CLOCKSOURCE:
2124         case KVM_CAP_PIT:
2125         case KVM_CAP_NOP_IO_DELAY:
2126         case KVM_CAP_MP_STATE:
2127         case KVM_CAP_SYNC_MMU:
2128         case KVM_CAP_USER_NMI:
2129         case KVM_CAP_REINJECT_CONTROL:
2130         case KVM_CAP_IRQ_INJECT_STATUS:
2131         case KVM_CAP_ASSIGN_DEV_IRQ:
2132         case KVM_CAP_IRQFD:
2133         case KVM_CAP_IOEVENTFD:
2134         case KVM_CAP_PIT2:
2135         case KVM_CAP_PIT_STATE2:
2136         case KVM_CAP_SET_IDENTITY_MAP_ADDR:
2137         case KVM_CAP_XEN_HVM:
2138         case KVM_CAP_ADJUST_CLOCK:
2139         case KVM_CAP_VCPU_EVENTS:
2140         case KVM_CAP_HYPERV:
2141         case KVM_CAP_HYPERV_VAPIC:
2142         case KVM_CAP_HYPERV_SPIN:
2143         case KVM_CAP_PCI_SEGMENT:
2144         case KVM_CAP_DEBUGREGS:
2145         case KVM_CAP_X86_ROBUST_SINGLESTEP:
2146         case KVM_CAP_XSAVE:
2147         case KVM_CAP_ASYNC_PF:
2148         case KVM_CAP_GET_TSC_KHZ:
2149         case KVM_CAP_PCI_2_3:
2150                 r = 1;
2151                 break;
2152         case KVM_CAP_COALESCED_MMIO:
2153                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
2154                 break;
2155         case KVM_CAP_VAPIC:
2156                 r = !kvm_x86_ops->cpu_has_accelerated_tpr();
2157                 break;
2158         case KVM_CAP_NR_VCPUS:
2159                 r = KVM_SOFT_MAX_VCPUS;
2160                 break;
2161         case KVM_CAP_MAX_VCPUS:
2162                 r = KVM_MAX_VCPUS;
2163                 break;
2164         case KVM_CAP_NR_MEMSLOTS:
2165                 r = KVM_MEMORY_SLOTS;
2166                 break;
2167         case KVM_CAP_PV_MMU:    /* obsolete */
2168                 r = 0;
2169                 break;
2170         case KVM_CAP_IOMMU:
2171                 r = iommu_present(&pci_bus_type);
2172                 break;
2173         case KVM_CAP_MCE:
2174                 r = KVM_MAX_MCE_BANKS;
2175                 break;
2176         case KVM_CAP_XCRS:
2177                 r = cpu_has_xsave;
2178                 break;
2179         case KVM_CAP_TSC_CONTROL:
2180                 r = kvm_has_tsc_control;
2181                 break;
2182         case KVM_CAP_TSC_DEADLINE_TIMER:
2183                 r = boot_cpu_has(X86_FEATURE_TSC_DEADLINE_TIMER);
2184                 break;
2185         default:
2186                 r = 0;
2187                 break;
2188         }
2189         return r;
2190
2191 }
2192
2193 long kvm_arch_dev_ioctl(struct file *filp,
2194                         unsigned int ioctl, unsigned long arg)
2195 {
2196         void __user *argp = (void __user *)arg;
2197         long r;
2198
2199         switch (ioctl) {
2200         case KVM_GET_MSR_INDEX_LIST: {
2201                 struct kvm_msr_list __user *user_msr_list = argp;
2202                 struct kvm_msr_list msr_list;
2203                 unsigned n;
2204
2205                 r = -EFAULT;
2206                 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
2207                         goto out;
2208                 n = msr_list.nmsrs;
2209                 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
2210                 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
2211                         goto out;
2212                 r = -E2BIG;
2213                 if (n < msr_list.nmsrs)
2214                         goto out;
2215                 r = -EFAULT;
2216                 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
2217                                  num_msrs_to_save * sizeof(u32)))
2218                         goto out;
2219                 if (copy_to_user(user_msr_list->indices + num_msrs_to_save,
2220                                  &emulated_msrs,
2221                                  ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
2222                         goto out;
2223                 r = 0;
2224                 break;
2225         }
2226         case KVM_GET_SUPPORTED_CPUID: {
2227                 struct kvm_cpuid2 __user *cpuid_arg = argp;
2228                 struct kvm_cpuid2 cpuid;
2229
2230                 r = -EFAULT;
2231                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2232                         goto out;
2233                 r = kvm_dev_ioctl_get_supported_cpuid(&cpuid,
2234                                                       cpuid_arg->entries);
2235                 if (r)
2236                         goto out;
2237
2238                 r = -EFAULT;
2239                 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
2240                         goto out;
2241                 r = 0;
2242                 break;
2243         }
2244         case KVM_X86_GET_MCE_CAP_SUPPORTED: {
2245                 u64 mce_cap;
2246
2247                 mce_cap = KVM_MCE_CAP_SUPPORTED;
2248                 r = -EFAULT;
2249                 if (copy_to_user(argp, &mce_cap, sizeof mce_cap))
2250                         goto out;
2251                 r = 0;
2252                 break;
2253         }
2254         default:
2255                 r = -EINVAL;
2256         }
2257 out:
2258         return r;
2259 }
2260
2261 static void wbinvd_ipi(void *garbage)
2262 {
2263         wbinvd();
2264 }
2265
2266 static bool need_emulate_wbinvd(struct kvm_vcpu *vcpu)
2267 {
2268         return vcpu->kvm->arch.iommu_domain &&
2269                 !(vcpu->kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY);
2270 }
2271
2272 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
2273 {
2274         /* Address WBINVD may be executed by guest */
2275         if (need_emulate_wbinvd(vcpu)) {
2276                 if (kvm_x86_ops->has_wbinvd_exit())
2277                         cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask);
2278                 else if (vcpu->cpu != -1 && vcpu->cpu != cpu)
2279                         smp_call_function_single(vcpu->cpu,
2280                                         wbinvd_ipi, NULL, 1);
2281         }
2282
2283         kvm_x86_ops->vcpu_load(vcpu, cpu);
2284
2285         /* Apply any externally detected TSC adjustments (due to suspend) */
2286         if (unlikely(vcpu->arch.tsc_offset_adjustment)) {
2287                 adjust_tsc_offset_host(vcpu, vcpu->arch.tsc_offset_adjustment);
2288                 vcpu->arch.tsc_offset_adjustment = 0;
2289                 set_bit(KVM_REQ_CLOCK_UPDATE, &vcpu->requests);
2290         }
2291
2292         if (unlikely(vcpu->cpu != cpu) || check_tsc_unstable()) {
2293                 s64 tsc_delta = !vcpu->arch.last_host_tsc ? 0 :
2294                                 native_read_tsc() - vcpu->arch.last_host_tsc;
2295                 if (tsc_delta < 0)
2296                         mark_tsc_unstable("KVM discovered backwards TSC");
2297                 if (check_tsc_unstable()) {
2298                         u64 offset = kvm_x86_ops->compute_tsc_offset(vcpu,
2299                                                 vcpu->arch.last_guest_tsc);
2300                         kvm_x86_ops->write_tsc_offset(vcpu, offset);
2301                         vcpu->arch.tsc_catchup = 1;
2302                 }
2303                 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
2304                 if (vcpu->cpu != cpu)
2305                         kvm_migrate_timers(vcpu);
2306                 vcpu->cpu = cpu;
2307         }
2308
2309         accumulate_steal_time(vcpu);
2310         kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
2311 }
2312
2313 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
2314 {
2315         kvm_x86_ops->vcpu_put(vcpu);
2316         kvm_put_guest_fpu(vcpu);
2317         vcpu->arch.last_host_tsc = native_read_tsc();
2318 }
2319
2320 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
2321                                     struct kvm_lapic_state *s)
2322 {
2323         memcpy(s->regs, vcpu->arch.apic->regs, sizeof *s);
2324
2325         return 0;
2326 }
2327
2328 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
2329                                     struct kvm_lapic_state *s)
2330 {
2331         memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s);
2332         kvm_apic_post_state_restore(vcpu);
2333         update_cr8_intercept(vcpu);
2334
2335         return 0;
2336 }
2337
2338 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
2339                                     struct kvm_interrupt *irq)
2340 {
2341         if (irq->irq < 0 || irq->irq >= 256)
2342                 return -EINVAL;
2343         if (irqchip_in_kernel(vcpu->kvm))
2344                 return -ENXIO;
2345
2346         kvm_queue_interrupt(vcpu, irq->irq, false);
2347         kvm_make_request(KVM_REQ_EVENT, vcpu);
2348
2349         return 0;
2350 }
2351
2352 static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu)
2353 {
2354         kvm_inject_nmi(vcpu);
2355
2356         return 0;
2357 }
2358
2359 static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu,
2360                                            struct kvm_tpr_access_ctl *tac)
2361 {
2362         if (tac->flags)
2363                 return -EINVAL;
2364         vcpu->arch.tpr_access_reporting = !!tac->enabled;
2365         return 0;
2366 }
2367
2368 static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu,
2369                                         u64 mcg_cap)
2370 {
2371         int r;
2372         unsigned bank_num = mcg_cap & 0xff, bank;
2373
2374         r = -EINVAL;
2375         if (!bank_num || bank_num >= KVM_MAX_MCE_BANKS)
2376                 goto out;
2377         if (mcg_cap & ~(KVM_MCE_CAP_SUPPORTED | 0xff | 0xff0000))
2378                 goto out;
2379         r = 0;
2380         vcpu->arch.mcg_cap = mcg_cap;
2381         /* Init IA32_MCG_CTL to all 1s */
2382         if (mcg_cap & MCG_CTL_P)
2383                 vcpu->arch.mcg_ctl = ~(u64)0;
2384         /* Init IA32_MCi_CTL to all 1s */
2385         for (bank = 0; bank < bank_num; bank++)
2386                 vcpu->arch.mce_banks[bank*4] = ~(u64)0;
2387 out:
2388         return r;
2389 }
2390
2391 static int kvm_vcpu_ioctl_x86_set_mce(struct kvm_vcpu *vcpu,
2392                                       struct kvm_x86_mce *mce)
2393 {
2394         u64 mcg_cap = vcpu->arch.mcg_cap;
2395         unsigned bank_num = mcg_cap & 0xff;
2396         u64 *banks = vcpu->arch.mce_banks;
2397
2398         if (mce->bank >= bank_num || !(mce->status & MCI_STATUS_VAL))
2399                 return -EINVAL;
2400         /*
2401          * if IA32_MCG_CTL is not all 1s, the uncorrected error
2402          * reporting is disabled
2403          */
2404         if ((mce->status & MCI_STATUS_UC) && (mcg_cap & MCG_CTL_P) &&
2405             vcpu->arch.mcg_ctl != ~(u64)0)
2406                 return 0;
2407         banks += 4 * mce->bank;
2408         /*
2409          * if IA32_MCi_CTL is not all 1s, the uncorrected error
2410          * reporting is disabled for the bank
2411          */
2412         if ((mce->status & MCI_STATUS_UC) && banks[0] != ~(u64)0)
2413                 return 0;
2414         if (mce->status & MCI_STATUS_UC) {
2415                 if ((vcpu->arch.mcg_status & MCG_STATUS_MCIP) ||
2416                     !kvm_read_cr4_bits(vcpu, X86_CR4_MCE)) {
2417                         kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
2418                         return 0;
2419                 }
2420                 if (banks[1] & MCI_STATUS_VAL)
2421                         mce->status |= MCI_STATUS_OVER;
2422                 banks[2] = mce->addr;
2423                 banks[3] = mce->misc;
2424                 vcpu->arch.mcg_status = mce->mcg_status;
2425                 banks[1] = mce->status;
2426                 kvm_queue_exception(vcpu, MC_VECTOR);
2427         } else if (!(banks[1] & MCI_STATUS_VAL)
2428                    || !(banks[1] & MCI_STATUS_UC)) {
2429                 if (banks[1] & MCI_STATUS_VAL)
2430                         mce->status |= MCI_STATUS_OVER;
2431                 banks[2] = mce->addr;
2432                 banks[3] = mce->misc;
2433                 banks[1] = mce->status;
2434         } else
2435                 banks[1] |= MCI_STATUS_OVER;
2436         return 0;
2437 }
2438
2439 static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu,
2440                                                struct kvm_vcpu_events *events)
2441 {
2442         process_nmi(vcpu);
2443         events->exception.injected =
2444                 vcpu->arch.exception.pending &&
2445                 !kvm_exception_is_soft(vcpu->arch.exception.nr);
2446         events->exception.nr = vcpu->arch.exception.nr;
2447         events->exception.has_error_code = vcpu->arch.exception.has_error_code;
2448         events->exception.pad = 0;
2449         events->exception.error_code = vcpu->arch.exception.error_code;
2450
2451         events->interrupt.injected =
2452                 vcpu->arch.interrupt.pending && !vcpu->arch.interrupt.soft;
2453         events->interrupt.nr = vcpu->arch.interrupt.nr;
2454         events->interrupt.soft = 0;
2455         events->interrupt.shadow =
2456                 kvm_x86_ops->get_interrupt_shadow(vcpu,
2457                         KVM_X86_SHADOW_INT_MOV_SS | KVM_X86_SHADOW_INT_STI);
2458
2459         events->nmi.injected = vcpu->arch.nmi_injected;
2460         events->nmi.pending = vcpu->arch.nmi_pending != 0;
2461         events->nmi.masked = kvm_x86_ops->get_nmi_mask(vcpu);
2462         events->nmi.pad = 0;
2463
2464         events->sipi_vector = vcpu->arch.sipi_vector;
2465
2466         events->flags = (KVM_VCPUEVENT_VALID_NMI_PENDING
2467                          | KVM_VCPUEVENT_VALID_SIPI_VECTOR
2468                          | KVM_VCPUEVENT_VALID_SHADOW);
2469         memset(&events->reserved, 0, sizeof(events->reserved));
2470 }
2471
2472 static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu,
2473                                               struct kvm_vcpu_events *events)
2474 {
2475         if (events->flags & ~(KVM_VCPUEVENT_VALID_NMI_PENDING
2476                               | KVM_VCPUEVENT_VALID_SIPI_VECTOR
2477                               | KVM_VCPUEVENT_VALID_SHADOW))
2478                 return -EINVAL;
2479
2480         process_nmi(vcpu);
2481         vcpu->arch.exception.pending = events->exception.injected;
2482         vcpu->arch.exception.nr = events->exception.nr;
2483         vcpu->arch.exception.has_error_code = events->exception.has_error_code;
2484         vcpu->arch.exception.error_code = events->exception.error_code;
2485
2486         vcpu->arch.interrupt.pending = events->interrupt.injected;
2487         vcpu->arch.interrupt.nr = events->interrupt.nr;
2488         vcpu->arch.interrupt.soft = events->interrupt.soft;
2489         if (events->flags & KVM_VCPUEVENT_VALID_SHADOW)
2490                 kvm_x86_ops->set_interrupt_shadow(vcpu,
2491                                                   events->interrupt.shadow);
2492
2493         vcpu->arch.nmi_injected = events->nmi.injected;
2494         if (events->flags & KVM_VCPUEVENT_VALID_NMI_PENDING)
2495                 vcpu->arch.nmi_pending = events->nmi.pending;
2496         kvm_x86_ops->set_nmi_mask(vcpu, events->nmi.masked);
2497
2498         if (events->flags & KVM_VCPUEVENT_VALID_SIPI_VECTOR)
2499                 vcpu->arch.sipi_vector = events->sipi_vector;
2500
2501         kvm_make_request(KVM_REQ_EVENT, vcpu);
2502
2503         return 0;
2504 }
2505
2506 static void kvm_vcpu_ioctl_x86_get_debugregs(struct kvm_vcpu *vcpu,
2507                                              struct kvm_debugregs *dbgregs)
2508 {
2509         memcpy(dbgregs->db, vcpu->arch.db, sizeof(vcpu->arch.db));
2510         dbgregs->dr6 = vcpu->arch.dr6;
2511         dbgregs->dr7 = vcpu->arch.dr7;
2512         dbgregs->flags = 0;
2513         memset(&dbgregs->reserved, 0, sizeof(dbgregs->reserved));
2514 }
2515
2516 static int kvm_vcpu_ioctl_x86_set_debugregs(struct kvm_vcpu *vcpu,
2517                                             struct kvm_debugregs *dbgregs)
2518 {
2519         if (dbgregs->flags)
2520                 return -EINVAL;
2521
2522         memcpy(vcpu->arch.db, dbgregs->db, sizeof(vcpu->arch.db));
2523         vcpu->arch.dr6 = dbgregs->dr6;
2524         vcpu->arch.dr7 = dbgregs->dr7;
2525
2526         return 0;
2527 }
2528
2529 static void kvm_vcpu_ioctl_x86_get_xsave(struct kvm_vcpu *vcpu,
2530                                          struct kvm_xsave *guest_xsave)
2531 {
2532         if (cpu_has_xsave)
2533                 memcpy(guest_xsave->region,
2534                         &vcpu->arch.guest_fpu.state->xsave,
2535                         xstate_size);
2536         else {
2537                 memcpy(guest_xsave->region,
2538                         &vcpu->arch.guest_fpu.state->fxsave,
2539                         sizeof(struct i387_fxsave_struct));
2540                 *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)] =
2541                         XSTATE_FPSSE;
2542         }
2543 }
2544
2545 static int kvm_vcpu_ioctl_x86_set_xsave(struct kvm_vcpu *vcpu,
2546                                         struct kvm_xsave *guest_xsave)
2547 {
2548         u64 xstate_bv =
2549                 *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)];
2550
2551         if (cpu_has_xsave)
2552                 memcpy(&vcpu->arch.guest_fpu.state->xsave,
2553                         guest_xsave->region, xstate_size);
2554         else {
2555                 if (xstate_bv & ~XSTATE_FPSSE)
2556                         return -EINVAL;
2557                 memcpy(&vcpu->arch.guest_fpu.state->fxsave,
2558                         guest_xsave->region, sizeof(struct i387_fxsave_struct));
2559         }
2560         return 0;
2561 }
2562
2563 static void kvm_vcpu_ioctl_x86_get_xcrs(struct kvm_vcpu *vcpu,
2564                                         struct kvm_xcrs *guest_xcrs)
2565 {
2566         if (!cpu_has_xsave) {
2567                 guest_xcrs->nr_xcrs = 0;
2568                 return;
2569         }
2570
2571         guest_xcrs->nr_xcrs = 1;
2572         guest_xcrs->flags = 0;
2573         guest_xcrs->xcrs[0].xcr = XCR_XFEATURE_ENABLED_MASK;
2574         guest_xcrs->xcrs[0].value = vcpu->arch.xcr0;
2575 }
2576
2577 static int kvm_vcpu_ioctl_x86_set_xcrs(struct kvm_vcpu *vcpu,
2578                                        struct kvm_xcrs *guest_xcrs)
2579 {
2580         int i, r = 0;
2581
2582         if (!cpu_has_xsave)
2583                 return -EINVAL;
2584
2585         if (guest_xcrs->nr_xcrs > KVM_MAX_XCRS || guest_xcrs->flags)
2586                 return -EINVAL;
2587
2588         for (i = 0; i < guest_xcrs->nr_xcrs; i++)
2589                 /* Only support XCR0 currently */
2590                 if (guest_xcrs->xcrs[0].xcr == XCR_XFEATURE_ENABLED_MASK) {
2591                         r = __kvm_set_xcr(vcpu, XCR_XFEATURE_ENABLED_MASK,
2592                                 guest_xcrs->xcrs[0].value);
2593                         break;
2594                 }
2595         if (r)
2596                 r = -EINVAL;
2597         return r;
2598 }
2599
2600 long kvm_arch_vcpu_ioctl(struct file *filp,
2601                          unsigned int ioctl, unsigned long arg)
2602 {
2603         struct kvm_vcpu *vcpu = filp->private_data;
2604         void __user *argp = (void __user *)arg;
2605         int r;
2606         union {
2607                 struct kvm_lapic_state *lapic;
2608                 struct kvm_xsave *xsave;
2609                 struct kvm_xcrs *xcrs;
2610                 void *buffer;
2611         } u;
2612
2613         u.buffer = NULL;
2614         switch (ioctl) {
2615         case KVM_GET_LAPIC: {
2616                 r = -EINVAL;
2617                 if (!vcpu->arch.apic)
2618                         goto out;
2619                 u.lapic = kzalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL);
2620
2621                 r = -ENOMEM;
2622                 if (!u.lapic)
2623                         goto out;
2624                 r = kvm_vcpu_ioctl_get_lapic(vcpu, u.lapic);
2625                 if (r)
2626                         goto out;
2627                 r = -EFAULT;
2628                 if (copy_to_user(argp, u.lapic, sizeof(struct kvm_lapic_state)))
2629                         goto out;
2630                 r = 0;
2631                 break;
2632         }
2633         case KVM_SET_LAPIC: {
2634                 r = -EINVAL;
2635                 if (!vcpu->arch.apic)
2636                         goto out;
2637                 u.lapic = memdup_user(argp, sizeof(*u.lapic));
2638                 if (IS_ERR(u.lapic)) {
2639                         r = PTR_ERR(u.lapic);
2640                         goto out;
2641                 }
2642
2643                 r = kvm_vcpu_ioctl_set_lapic(vcpu, u.lapic);
2644                 if (r)
2645                         goto out;
2646                 r = 0;
2647                 break;
2648         }
2649         case KVM_INTERRUPT: {
2650                 struct kvm_interrupt irq;
2651
2652                 r = -EFAULT;
2653                 if (copy_from_user(&irq, argp, sizeof irq))
2654                         goto out;
2655                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
2656                 if (r)
2657                         goto out;
2658                 r = 0;
2659                 break;
2660         }
2661         case KVM_NMI: {
2662                 r = kvm_vcpu_ioctl_nmi(vcpu);
2663                 if (r)
2664                         goto out;
2665                 r = 0;
2666                 break;
2667         }
2668         case KVM_SET_CPUID: {
2669                 struct kvm_cpuid __user *cpuid_arg = argp;
2670                 struct kvm_cpuid cpuid;
2671
2672                 r = -EFAULT;
2673                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2674                         goto out;
2675                 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
2676                 if (r)
2677                         goto out;
2678                 break;
2679         }
2680         case KVM_SET_CPUID2: {
2681                 struct kvm_cpuid2 __user *cpuid_arg = argp;
2682                 struct kvm_cpuid2 cpuid;
2683
2684                 r = -EFAULT;
2685                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2686                         goto out;
2687                 r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid,
2688                                               cpuid_arg->entries);
2689                 if (r)
2690                         goto out;
2691                 break;
2692         }
2693         case KVM_GET_CPUID2: {
2694                 struct kvm_cpuid2 __user *cpuid_arg = argp;
2695                 struct kvm_cpuid2 cpuid;
2696
2697                 r = -EFAULT;
2698                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2699                         goto out;
2700                 r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid,
2701                                               cpuid_arg->entries);
2702                 if (r)
2703                         goto out;
2704                 r = -EFAULT;
2705                 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
2706                         goto out;
2707                 r = 0;
2708                 break;
2709         }
2710         case KVM_GET_MSRS:
2711                 r = msr_io(vcpu, argp, kvm_get_msr, 1);
2712                 break;
2713         case KVM_SET_MSRS:
2714                 r = msr_io(vcpu, argp, do_set_msr, 0);
2715                 break;
2716         case KVM_TPR_ACCESS_REPORTING: {
2717                 struct kvm_tpr_access_ctl tac;
2718
2719                 r = -EFAULT;
2720                 if (copy_from_user(&tac, argp, sizeof tac))
2721                         goto out;
2722                 r = vcpu_ioctl_tpr_access_reporting(vcpu, &tac);
2723                 if (r)
2724                         goto out;
2725                 r = -EFAULT;
2726                 if (copy_to_user(argp, &tac, sizeof tac))
2727                         goto out;
2728                 r = 0;
2729                 break;
2730         };
2731         case KVM_SET_VAPIC_ADDR: {
2732                 struct kvm_vapic_addr va;
2733
2734                 r = -EINVAL;
2735                 if (!irqchip_in_kernel(vcpu->kvm))
2736                         goto out;
2737                 r = -EFAULT;
2738                 if (copy_from_user(&va, argp, sizeof va))
2739                         goto out;
2740                 r = 0;
2741                 kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr);
2742                 break;
2743         }
2744         case KVM_X86_SETUP_MCE: {
2745                 u64 mcg_cap;
2746
2747                 r = -EFAULT;
2748                 if (copy_from_user(&mcg_cap, argp, sizeof mcg_cap))
2749                         goto out;
2750                 r = kvm_vcpu_ioctl_x86_setup_mce(vcpu, mcg_cap);
2751                 break;
2752         }
2753         case KVM_X86_SET_MCE: {
2754                 struct kvm_x86_mce mce;
2755
2756                 r = -EFAULT;
2757                 if (copy_from_user(&mce, argp, sizeof mce))
2758                         goto out;
2759                 r = kvm_vcpu_ioctl_x86_set_mce(vcpu, &mce);
2760                 break;
2761         }
2762         case KVM_GET_VCPU_EVENTS: {
2763                 struct kvm_vcpu_events events;
2764
2765                 kvm_vcpu_ioctl_x86_get_vcpu_events(vcpu, &events);
2766
2767                 r = -EFAULT;
2768                 if (copy_to_user(argp, &events, sizeof(struct kvm_vcpu_events)))
2769                         break;
2770                 r = 0;
2771                 break;
2772         }
2773         case KVM_SET_VCPU_EVENTS: {
2774                 struct kvm_vcpu_events events;
2775
2776                 r = -EFAULT;
2777                 if (copy_from_user(&events, argp, sizeof(struct kvm_vcpu_events)))
2778                         break;
2779
2780                 r = kvm_vcpu_ioctl_x86_set_vcpu_events(vcpu, &events);
2781                 break;
2782         }
2783         case KVM_GET_DEBUGREGS: {
2784                 struct kvm_debugregs dbgregs;
2785
2786                 kvm_vcpu_ioctl_x86_get_debugregs(vcpu, &dbgregs);
2787
2788                 r = -EFAULT;
2789                 if (copy_to_user(argp, &dbgregs,
2790                                  sizeof(struct kvm_debugregs)))
2791                         break;
2792                 r = 0;
2793                 break;
2794         }
2795         case KVM_SET_DEBUGREGS: {
2796                 struct kvm_debugregs dbgregs;
2797
2798                 r = -EFAULT;
2799                 if (copy_from_user(&dbgregs, argp,
2800                                    sizeof(struct kvm_debugregs)))
2801                         break;
2802
2803                 r = kvm_vcpu_ioctl_x86_set_debugregs(vcpu, &dbgregs);
2804                 break;
2805         }
2806         case KVM_GET_XSAVE: {
2807                 u.xsave = kzalloc(sizeof(struct kvm_xsave), GFP_KERNEL);
2808                 r = -ENOMEM;
2809                 if (!u.xsave)
2810                         break;
2811
2812                 kvm_vcpu_ioctl_x86_get_xsave(vcpu, u.xsave);
2813
2814                 r = -EFAULT;
2815                 if (copy_to_user(argp, u.xsave, sizeof(struct kvm_xsave)))
2816                         break;
2817                 r = 0;
2818                 break;
2819         }
2820         case KVM_SET_XSAVE: {
2821                 u.xsave = memdup_user(argp, sizeof(*u.xsave));
2822                 if (IS_ERR(u.xsave)) {
2823                         r = PTR_ERR(u.xsave);
2824                         goto out;
2825                 }
2826
2827                 r = kvm_vcpu_ioctl_x86_set_xsave(vcpu, u.xsave);
2828                 break;
2829         }
2830         case KVM_GET_XCRS: {
2831                 u.xcrs = kzalloc(sizeof(struct kvm_xcrs), GFP_KERNEL);
2832                 r = -ENOMEM;
2833                 if (!u.xcrs)
2834                         break;
2835
2836                 kvm_vcpu_ioctl_x86_get_xcrs(vcpu, u.xcrs);
2837
2838                 r = -EFAULT;
2839                 if (copy_to_user(argp, u.xcrs,
2840                                  sizeof(struct kvm_xcrs)))
2841                         break;
2842                 r = 0;
2843                 break;
2844         }
2845         case KVM_SET_XCRS: {
2846                 u.xcrs = memdup_user(argp, sizeof(*u.xcrs));
2847                 if (IS_ERR(u.xcrs)) {
2848                         r = PTR_ERR(u.xcrs);
2849                         goto out;
2850                 }
2851
2852                 r = kvm_vcpu_ioctl_x86_set_xcrs(vcpu, u.xcrs);
2853                 break;
2854         }
2855         case KVM_SET_TSC_KHZ: {
2856                 u32 user_tsc_khz;
2857
2858                 r = -EINVAL;
2859                 user_tsc_khz = (u32)arg;
2860
2861                 if (user_tsc_khz >= kvm_max_guest_tsc_khz)
2862                         goto out;
2863
2864                 if (user_tsc_khz == 0)
2865                         user_tsc_khz = tsc_khz;
2866
2867                 kvm_set_tsc_khz(vcpu, user_tsc_khz);
2868
2869                 r = 0;
2870                 goto out;
2871         }
2872         case KVM_GET_TSC_KHZ: {
2873                 r = vcpu->arch.virtual_tsc_khz;
2874                 goto out;
2875         }
2876         default:
2877                 r = -EINVAL;
2878         }
2879 out:
2880         kfree(u.buffer);
2881         return r;
2882 }
2883
2884 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
2885 {
2886         return VM_FAULT_SIGBUS;
2887 }
2888
2889 static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr)
2890 {
2891         int ret;
2892
2893         if (addr > (unsigned int)(-3 * PAGE_SIZE))
2894                 return -1;
2895         ret = kvm_x86_ops->set_tss_addr(kvm, addr);
2896         return ret;
2897 }
2898
2899 static int kvm_vm_ioctl_set_identity_map_addr(struct kvm *kvm,
2900                                               u64 ident_addr)
2901 {
2902         kvm->arch.ept_identity_map_addr = ident_addr;
2903         return 0;
2904 }
2905
2906 static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
2907                                           u32 kvm_nr_mmu_pages)
2908 {
2909         if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES)
2910                 return -EINVAL;
2911
2912         mutex_lock(&kvm->slots_lock);
2913         spin_lock(&kvm->mmu_lock);
2914
2915         kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
2916         kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages;
2917
2918         spin_unlock(&kvm->mmu_lock);
2919         mutex_unlock(&kvm->slots_lock);
2920         return 0;
2921 }
2922
2923 static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
2924 {
2925         return kvm->arch.n_max_mmu_pages;
2926 }
2927
2928 static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
2929 {
2930         int r;
2931
2932         r = 0;
2933         switch (chip->chip_id) {
2934         case KVM_IRQCHIP_PIC_MASTER:
2935                 memcpy(&chip->chip.pic,
2936                         &pic_irqchip(kvm)->pics[0],
2937                         sizeof(struct kvm_pic_state));
2938                 break;
2939         case KVM_IRQCHIP_PIC_SLAVE:
2940                 memcpy(&chip->chip.pic,
2941                         &pic_irqchip(kvm)->pics[1],
2942                         sizeof(struct kvm_pic_state));
2943                 break;
2944         case KVM_IRQCHIP_IOAPIC:
2945                 r = kvm_get_ioapic(kvm, &chip->chip.ioapic);
2946                 break;
2947         default:
2948                 r = -EINVAL;
2949                 break;
2950         }
2951         return r;
2952 }
2953
2954 static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
2955 {
2956         int r;
2957
2958         r = 0;
2959         switch (chip->chip_id) {
2960         case KVM_IRQCHIP_PIC_MASTER:
2961                 spin_lock(&pic_irqchip(kvm)->lock);
2962                 memcpy(&pic_irqchip(kvm)->pics[0],
2963                         &chip->chip.pic,
2964                         sizeof(struct kvm_pic_state));
2965                 spin_unlock(&pic_irqchip(kvm)->lock);
2966                 break;
2967         case KVM_IRQCHIP_PIC_SLAVE:
2968                 spin_lock(&pic_irqchip(kvm)->lock);
2969                 memcpy(&pic_irqchip(kvm)->pics[1],
2970                         &chip->chip.pic,
2971                         sizeof(struct kvm_pic_state));
2972                 spin_unlock(&pic_irqchip(kvm)->lock);
2973                 break;
2974         case KVM_IRQCHIP_IOAPIC:
2975                 r = kvm_set_ioapic(kvm, &chip->chip.ioapic);
2976                 break;
2977         default:
2978                 r = -EINVAL;
2979                 break;
2980         }
2981         kvm_pic_update_irq(pic_irqchip(kvm));
2982         return r;
2983 }
2984
2985 static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps)
2986 {
2987         int r = 0;
2988
2989         mutex_lock(&kvm->arch.vpit->pit_state.lock);
2990         memcpy(ps, &kvm->arch.vpit->pit_state, sizeof(struct kvm_pit_state));
2991         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
2992         return r;
2993 }
2994
2995 static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps)
2996 {
2997         int r = 0;
2998
2999         mutex_lock(&kvm->arch.vpit->pit_state.lock);
3000         memcpy(&kvm->arch.vpit->pit_state, ps, sizeof(struct kvm_pit_state));
3001         kvm_pit_load_count(kvm, 0, ps->channels[0].count, 0);
3002         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3003         return r;
3004 }
3005
3006 static int kvm_vm_ioctl_get_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
3007 {
3008         int r = 0;
3009
3010         mutex_lock(&kvm->arch.vpit->pit_state.lock);
3011         memcpy(ps->channels, &kvm->arch.vpit->pit_state.channels,
3012                 sizeof(ps->channels));
3013         ps->flags = kvm->arch.vpit->pit_state.flags;
3014         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3015         memset(&ps->reserved, 0, sizeof(ps->reserved));
3016         return r;
3017 }
3018
3019 static int kvm_vm_ioctl_set_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
3020 {
3021         int r = 0, start = 0;
3022         u32 prev_legacy, cur_legacy;
3023         mutex_lock(&kvm->arch.vpit->pit_state.lock);
3024         prev_legacy = kvm->arch.vpit->pit_state.flags & KVM_PIT_FLAGS_HPET_LEGACY;
3025         cur_legacy = ps->flags & KVM_PIT_FLAGS_HPET_LEGACY;
3026         if (!prev_legacy && cur_legacy)
3027                 start = 1;
3028         memcpy(&kvm->arch.vpit->pit_state.channels, &ps->channels,
3029                sizeof(kvm->arch.vpit->pit_state.channels));
3030         kvm->arch.vpit->pit_state.flags = ps->flags;
3031         kvm_pit_load_count(kvm, 0, kvm->arch.vpit->pit_state.channels[0].count, start);
3032         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3033         return r;
3034 }
3035
3036 static int kvm_vm_ioctl_reinject(struct kvm *kvm,
3037                                  struct kvm_reinject_control *control)
3038 {
3039         if (!kvm->arch.vpit)
3040                 return -ENXIO;
3041         mutex_lock(&kvm->arch.vpit->pit_state.lock);
3042         kvm->arch.vpit->pit_state.pit_timer.reinject = control->pit_reinject;
3043         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3044         return 0;
3045 }
3046
3047 /**
3048  * write_protect_slot - write protect a slot for dirty logging
3049  * @kvm: the kvm instance
3050  * @memslot: the slot we protect
3051  * @dirty_bitmap: the bitmap indicating which pages are dirty
3052  * @nr_dirty_pages: the number of dirty pages
3053  *
3054  * We have two ways to find all sptes to protect:
3055  * 1. Use kvm_mmu_slot_remove_write_access() which walks all shadow pages and
3056  *    checks ones that have a spte mapping a page in the slot.
3057  * 2. Use kvm_mmu_rmap_write_protect() for each gfn found in the bitmap.
3058  *
3059  * Generally speaking, if there are not so many dirty pages compared to the
3060  * number of shadow pages, we should use the latter.
3061  *
3062  * Note that letting others write into a page marked dirty in the old bitmap
3063  * by using the remaining tlb entry is not a problem.  That page will become
3064  * write protected again when we flush the tlb and then be reported dirty to
3065  * the user space by copying the old bitmap.
3066  */
3067 static void write_protect_slot(struct kvm *kvm,
3068                                struct kvm_memory_slot *memslot,
3069                                unsigned long *dirty_bitmap,
3070                                unsigned long nr_dirty_pages)
3071 {
3072         spin_lock(&kvm->mmu_lock);
3073
3074         /* Not many dirty pages compared to # of shadow pages. */
3075         if (nr_dirty_pages < kvm->arch.n_used_mmu_pages) {
3076                 unsigned long gfn_offset;
3077
3078                 for_each_set_bit(gfn_offset, dirty_bitmap, memslot->npages) {
3079                         unsigned long gfn = memslot->base_gfn + gfn_offset;
3080
3081                         kvm_mmu_rmap_write_protect(kvm, gfn, memslot);
3082                 }
3083                 kvm_flush_remote_tlbs(kvm);
3084         } else
3085                 kvm_mmu_slot_remove_write_access(kvm, memslot->id);
3086
3087         spin_unlock(&kvm->mmu_lock);
3088 }
3089
3090 /*
3091  * Get (and clear) the dirty memory log for a memory slot.
3092  */
3093 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
3094                                       struct kvm_dirty_log *log)
3095 {
3096         int r;
3097         struct kvm_memory_slot *memslot;
3098         unsigned long n, nr_dirty_pages;
3099
3100         mutex_lock(&kvm->slots_lock);
3101
3102         r = -EINVAL;
3103         if (log->slot >= KVM_MEMORY_SLOTS)
3104                 goto out;
3105
3106         memslot = id_to_memslot(kvm->memslots, log->slot);
3107         r = -ENOENT;
3108         if (!memslot->dirty_bitmap)
3109                 goto out;
3110
3111         n = kvm_dirty_bitmap_bytes(memslot);
3112         nr_dirty_pages = memslot->nr_dirty_pages;
3113
3114         /* If nothing is dirty, don't bother messing with page tables. */
3115         if (nr_dirty_pages) {
3116                 struct kvm_memslots *slots, *old_slots;
3117                 unsigned long *dirty_bitmap, *dirty_bitmap_head;
3118
3119                 dirty_bitmap = memslot->dirty_bitmap;
3120                 dirty_bitmap_head = memslot->dirty_bitmap_head;
3121                 if (dirty_bitmap == dirty_bitmap_head)
3122                         dirty_bitmap_head += n / sizeof(long);
3123                 memset(dirty_bitmap_head, 0, n);
3124
3125                 r = -ENOMEM;
3126                 slots = kmemdup(kvm->memslots, sizeof(*kvm->memslots), GFP_KERNEL);
3127                 if (!slots)
3128                         goto out;
3129
3130                 memslot = id_to_memslot(slots, log->slot);
3131                 memslot->nr_dirty_pages = 0;
3132                 memslot->dirty_bitmap = dirty_bitmap_head;
3133                 update_memslots(slots, NULL);
3134
3135                 old_slots = kvm->memslots;
3136                 rcu_assign_pointer(kvm->memslots, slots);
3137                 synchronize_srcu_expedited(&kvm->srcu);
3138                 kfree(old_slots);
3139
3140                 write_protect_slot(kvm, memslot, dirty_bitmap, nr_dirty_pages);
3141
3142                 r = -EFAULT;
3143                 if (copy_to_user(log->dirty_bitmap, dirty_bitmap, n))
3144                         goto out;
3145         } else {
3146                 r = -EFAULT;
3147                 if (clear_user(log->dirty_bitmap, n))
3148                         goto out;
3149         }
3150
3151         r = 0;
3152 out:
3153         mutex_unlock(&kvm->slots_lock);
3154         return r;
3155 }
3156
3157 long kvm_arch_vm_ioctl(struct file *filp,
3158                        unsigned int ioctl, unsigned long arg)
3159 {
3160         struct kvm *kvm = filp->private_data;
3161         void __user *argp = (void __user *)arg;
3162         int r = -ENOTTY;
3163         /*
3164          * This union makes it completely explicit to gcc-3.x
3165          * that these two variables' stack usage should be
3166          * combined, not added together.
3167          */
3168         union {
3169                 struct kvm_pit_state ps;
3170                 struct kvm_pit_state2 ps2;
3171                 struct kvm_pit_config pit_config;
3172         } u;
3173
3174         switch (ioctl) {
3175         case KVM_SET_TSS_ADDR:
3176                 r = kvm_vm_ioctl_set_tss_addr(kvm, arg);
3177                 if (r < 0)
3178                         goto out;
3179                 break;
3180         case KVM_SET_IDENTITY_MAP_ADDR: {
3181                 u64 ident_addr;
3182
3183                 r = -EFAULT;
3184                 if (copy_from_user(&ident_addr, argp, sizeof ident_addr))
3185                         goto out;
3186                 r = kvm_vm_ioctl_set_identity_map_addr(kvm, ident_addr);
3187                 if (r < 0)
3188                         goto out;
3189                 break;
3190         }
3191         case KVM_SET_NR_MMU_PAGES:
3192                 r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);
3193                 if (r)
3194                         goto out;
3195                 break;
3196         case KVM_GET_NR_MMU_PAGES:
3197                 r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
3198                 break;
3199         case KVM_CREATE_IRQCHIP: {
3200                 struct kvm_pic *vpic;
3201
3202                 mutex_lock(&kvm->lock);
3203                 r = -EEXIST;
3204                 if (kvm->arch.vpic)
3205                         goto create_irqchip_unlock;
3206                 r = -EINVAL;
3207                 if (atomic_read(&kvm->online_vcpus))
3208                         goto create_irqchip_unlock;
3209                 r = -ENOMEM;
3210                 vpic = kvm_create_pic(kvm);
3211                 if (vpic) {
3212                         r = kvm_ioapic_init(kvm);
3213                         if (r) {
3214                                 mutex_lock(&kvm->slots_lock);
3215                                 kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS,
3216                                                           &vpic->dev_master);
3217                                 kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS,
3218                                                           &vpic->dev_slave);
3219                                 kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS,
3220                                                           &vpic->dev_eclr);
3221                                 mutex_unlock(&kvm->slots_lock);
3222                                 kfree(vpic);
3223                                 goto create_irqchip_unlock;
3224                         }
3225                 } else
3226                         goto create_irqchip_unlock;
3227                 smp_wmb();
3228                 kvm->arch.vpic = vpic;
3229                 smp_wmb();
3230                 r = kvm_setup_default_irq_routing(kvm);
3231                 if (r) {
3232                         mutex_lock(&kvm->slots_lock);
3233                         mutex_lock(&kvm->irq_lock);
3234                         kvm_ioapic_destroy(kvm);
3235                         kvm_destroy_pic(kvm);
3236                         mutex_unlock(&kvm->irq_lock);
3237                         mutex_unlock(&kvm->slots_lock);
3238                 }
3239         create_irqchip_unlock:
3240                 mutex_unlock(&kvm->lock);
3241                 break;
3242         }
3243         case KVM_CREATE_PIT:
3244                 u.pit_config.flags = KVM_PIT_SPEAKER_DUMMY;
3245                 goto create_pit;
3246         case KVM_CREATE_PIT2:
3247                 r = -EFAULT;
3248                 if (copy_from_user(&u.pit_config, argp,
3249                                    sizeof(struct kvm_pit_config)))
3250                         goto out;
3251         create_pit:
3252                 mutex_lock(&kvm->slots_lock);
3253                 r = -EEXIST;
3254                 if (kvm->arch.vpit)
3255                         goto create_pit_unlock;
3256                 r = -ENOMEM;
3257                 kvm->arch.vpit = kvm_create_pit(kvm, u.pit_config.flags);
3258                 if (kvm->arch.vpit)
3259                         r = 0;
3260         create_pit_unlock:
3261                 mutex_unlock(&kvm->slots_lock);
3262                 break;
3263         case KVM_IRQ_LINE_STATUS:
3264         case KVM_IRQ_LINE: {
3265                 struct kvm_irq_level irq_event;
3266
3267                 r = -EFAULT;
3268                 if (copy_from_user(&irq_event, argp, sizeof irq_event))
3269                         goto out;
3270                 r = -ENXIO;
3271                 if (irqchip_in_kernel(kvm)) {
3272                         __s32 status;
3273                         status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID,
3274                                         irq_event.irq, irq_event.level);
3275                         if (ioctl == KVM_IRQ_LINE_STATUS) {
3276                                 r = -EFAULT;
3277                                 irq_event.status = status;
3278                                 if (copy_to_user(argp, &irq_event,
3279                                                         sizeof irq_event))
3280                                         goto out;
3281                         }
3282                         r = 0;
3283                 }
3284                 break;
3285         }
3286         case KVM_GET_IRQCHIP: {
3287                 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
3288                 struct kvm_irqchip *chip;
3289
3290                 chip = memdup_user(argp, sizeof(*chip));
3291                 if (IS_ERR(chip)) {
3292                         r = PTR_ERR(chip);
3293                         goto out;
3294                 }
3295
3296                 r = -ENXIO;
3297                 if (!irqchip_in_kernel(kvm))
3298                         goto get_irqchip_out;
3299                 r = kvm_vm_ioctl_get_irqchip(kvm, chip);
3300                 if (r)
3301                         goto get_irqchip_out;
3302                 r = -EFAULT;
3303                 if (copy_to_user(argp, chip, sizeof *chip))
3304                         goto get_irqchip_out;
3305                 r = 0;
3306         get_irqchip_out:
3307                 kfree(chip);
3308                 if (r)
3309                         goto out;
3310                 break;
3311         }
3312         case KVM_SET_IRQCHIP: {
3313                 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
3314                 struct kvm_irqchip *chip;
3315
3316                 chip = memdup_user(argp, sizeof(*chip));
3317                 if (IS_ERR(chip)) {
3318                         r = PTR_ERR(chip);
3319                         goto out;
3320                 }
3321
3322                 r = -ENXIO;
3323                 if (!irqchip_in_kernel(kvm))
3324                         goto set_irqchip_out;
3325                 r = kvm_vm_ioctl_set_irqchip(kvm, chip);
3326                 if (r)
3327                         goto set_irqchip_out;
3328                 r = 0;
3329         set_irqchip_out:
3330                 kfree(chip);
3331                 if (r)
3332                         goto out;
3333                 break;
3334         }
3335         case KVM_GET_PIT: {
3336                 r = -EFAULT;
3337                 if (copy_from_user(&u.ps, argp, sizeof(struct kvm_pit_state)))
3338                         goto out;
3339                 r = -ENXIO;
3340                 if (!kvm->arch.vpit)
3341                         goto out;
3342                 r = kvm_vm_ioctl_get_pit(kvm, &u.ps);
3343                 if (r)
3344                         goto out;
3345                 r = -EFAULT;
3346                 if (copy_to_user(argp, &u.ps, sizeof(struct kvm_pit_state)))
3347                         goto out;
3348                 r = 0;
3349                 break;
3350         }
3351         case KVM_SET_PIT: {
3352                 r = -EFAULT;
3353                 if (copy_from_user(&u.ps, argp, sizeof u.ps))
3354                         goto out;
3355                 r = -ENXIO;
3356                 if (!kvm->arch.vpit)
3357                         goto out;
3358                 r = kvm_vm_ioctl_set_pit(kvm, &u.ps);
3359                 if (r)
3360                         goto out;
3361                 r = 0;
3362                 break;
3363         }
3364         case KVM_GET_PIT2: {
3365                 r = -ENXIO;
3366                 if (!kvm->arch.vpit)
3367                         goto out;
3368                 r = kvm_vm_ioctl_get_pit2(kvm, &u.ps2);
3369                 if (r)
3370                         goto out;
3371                 r = -EFAULT;
3372                 if (copy_to_user(argp, &u.ps2, sizeof(u.ps2)))
3373                         goto out;
3374                 r = 0;
3375                 break;
3376         }
3377         case KVM_SET_PIT2: {
3378                 r = -EFAULT;
3379                 if (copy_from_user(&u.ps2, argp, sizeof(u.ps2)))
3380                         goto out;
3381                 r = -ENXIO;
3382                 if (!kvm->arch.vpit)
3383                         goto out;
3384                 r = kvm_vm_ioctl_set_pit2(kvm, &u.ps2);
3385                 if (r)
3386                         goto out;
3387                 r = 0;
3388                 break;
3389         }
3390         case KVM_REINJECT_CONTROL: {
3391                 struct kvm_reinject_control control;
3392                 r =  -EFAULT;
3393                 if (copy_from_user(&control, argp, sizeof(control)))
3394                         goto out;
3395                 r = kvm_vm_ioctl_reinject(kvm, &control);
3396                 if (r)
3397                         goto out;
3398                 r = 0;
3399                 break;
3400         }
3401         case KVM_XEN_HVM_CONFIG: {
3402                 r = -EFAULT;
3403                 if (copy_from_user(&kvm->arch.xen_hvm_config, argp,
3404                                    sizeof(struct kvm_xen_hvm_config)))
3405                         goto out;
3406                 r = -EINVAL;
3407                 if (kvm->arch.xen_hvm_config.flags)
3408                         goto out;
3409                 r = 0;
3410                 break;
3411         }
3412         case KVM_SET_CLOCK: {
3413                 struct kvm_clock_data user_ns;
3414                 u64 now_ns;
3415                 s64 delta;
3416
3417                 r = -EFAULT;
3418                 if (copy_from_user(&user_ns, argp, sizeof(user_ns)))
3419                         goto out;
3420
3421                 r = -EINVAL;
3422                 if (user_ns.flags)
3423                         goto out;
3424
3425                 r = 0;
3426                 local_irq_disable();
3427                 now_ns = get_kernel_ns();
3428                 delta = user_ns.clock - now_ns;
3429                 local_irq_enable();
3430                 kvm->arch.kvmclock_offset = delta;
3431                 break;
3432         }
3433         case KVM_GET_CLOCK: {
3434                 struct kvm_clock_data user_ns;
3435                 u64 now_ns;
3436
3437                 local_irq_disable();
3438                 now_ns = get_kernel_ns();
3439                 user_ns.clock = kvm->arch.kvmclock_offset + now_ns;
3440                 local_irq_enable();
3441                 user_ns.flags = 0;
3442                 memset(&user_ns.pad, 0, sizeof(user_ns.pad));
3443
3444                 r = -EFAULT;
3445                 if (copy_to_user(argp, &user_ns, sizeof(user_ns)))
3446                         goto out;
3447                 r = 0;
3448                 break;
3449         }
3450
3451         default:
3452                 ;
3453         }
3454 out:
3455         return r;
3456 }
3457
3458 static void kvm_init_msr_list(void)
3459 {
3460         u32 dummy[2];
3461         unsigned i, j;
3462
3463         /* skip the first msrs in the list. KVM-specific */
3464         for (i = j = KVM_SAVE_MSRS_BEGIN; i < ARRAY_SIZE(msrs_to_save); i++) {
3465                 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
3466                         continue;
3467                 if (j < i)
3468                         msrs_to_save[j] = msrs_to_save[i];
3469                 j++;
3470         }
3471         num_msrs_to_save = j;
3472 }
3473
3474 static int vcpu_mmio_write(struct kvm_vcpu *vcpu, gpa_t addr, int len,
3475                            const void *v)
3476 {
3477         int handled = 0;
3478         int n;
3479
3480         do {
3481                 n = min(len, 8);
3482                 if (!(vcpu->arch.apic &&
3483                       !kvm_iodevice_write(&vcpu->arch.apic->dev, addr, n, v))
3484                     && kvm_io_bus_write(vcpu->kvm, KVM_MMIO_BUS, addr, n, v))
3485                         break;
3486                 handled += n;
3487                 addr += n;
3488                 len -= n;
3489                 v += n;
3490         } while (len);
3491
3492         return handled;
3493 }
3494
3495 static int vcpu_mmio_read(struct kvm_vcpu *vcpu, gpa_t addr, int len, void *v)
3496 {
3497         int handled = 0;
3498         int n;
3499
3500         do {
3501                 n = min(len, 8);
3502                 if (!(vcpu->arch.apic &&
3503                       !kvm_iodevice_read(&vcpu->arch.apic->dev, addr, n, v))
3504                     && kvm_io_bus_read(vcpu->kvm, KVM_MMIO_BUS, addr, n, v))
3505                         break;
3506                 trace_kvm_mmio(KVM_TRACE_MMIO_READ, n, addr, *(u64 *)v);
3507                 handled += n;
3508                 addr += n;
3509                 len -= n;
3510                 v += n;
3511         } while (len);
3512
3513         return handled;
3514 }
3515
3516 static void kvm_set_segment(struct kvm_vcpu *vcpu,
3517                         struct kvm_segment *var, int seg)
3518 {
3519         kvm_x86_ops->set_segment(vcpu, var, seg);
3520 }
3521
3522 void kvm_get_segment(struct kvm_vcpu *vcpu,
3523                      struct kvm_segment *var, int seg)
3524 {
3525         kvm_x86_ops->get_segment(vcpu, var, seg);
3526 }
3527
3528 gpa_t translate_nested_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 access)
3529 {
3530         gpa_t t_gpa;
3531         struct x86_exception exception;
3532
3533         BUG_ON(!mmu_is_nested(vcpu));
3534
3535         /* NPT walks are always user-walks */
3536         access |= PFERR_USER_MASK;
3537         t_gpa  = vcpu->arch.mmu.gva_to_gpa(vcpu, gpa, access, &exception);
3538
3539         return t_gpa;
3540 }
3541
3542 gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva,
3543                               struct x86_exception *exception)
3544 {
3545         u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3546         return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
3547 }
3548
3549  gpa_t kvm_mmu_gva_to_gpa_fetch(struct kvm_vcpu *vcpu, gva_t gva,
3550                                 struct x86_exception *exception)
3551 {
3552         u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3553         access |= PFERR_FETCH_MASK;
3554         return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
3555 }
3556
3557 gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva,
3558                                struct x86_exception *exception)
3559 {
3560         u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3561         access |= PFERR_WRITE_MASK;
3562         return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
3563 }
3564
3565 /* uses this to access any guest's mapped memory without checking CPL */
3566 gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva,
3567                                 struct x86_exception *exception)
3568 {
3569         return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, 0, exception);
3570 }
3571
3572 static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes,
3573                                       struct kvm_vcpu *vcpu, u32 access,
3574                                       struct x86_exception *exception)
3575 {
3576         void *data = val;
3577         int r = X86EMUL_CONTINUE;
3578
3579         while (bytes) {
3580                 gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, access,
3581                                                             exception);
3582                 unsigned offset = addr & (PAGE_SIZE-1);
3583                 unsigned toread = min(bytes, (unsigned)PAGE_SIZE - offset);
3584                 int ret;
3585
3586                 if (gpa == UNMAPPED_GVA)
3587                         return X86EMUL_PROPAGATE_FAULT;
3588                 ret = kvm_read_guest(vcpu->kvm, gpa, data, toread);
3589                 if (ret < 0) {
3590                         r = X86EMUL_IO_NEEDED;
3591                         goto out;
3592                 }
3593
3594                 bytes -= toread;
3595                 data += toread;
3596                 addr += toread;
3597         }
3598 out:
3599         return r;
3600 }
3601
3602 /* used for instruction fetching */
3603 static int kvm_fetch_guest_virt(struct x86_emulate_ctxt *ctxt,
3604                                 gva_t addr, void *val, unsigned int bytes,
3605                                 struct x86_exception *exception)
3606 {
3607         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
3608         u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3609
3610         return kvm_read_guest_virt_helper(addr, val, bytes, vcpu,
3611                                           access | PFERR_FETCH_MASK,
3612                                           exception);
3613 }
3614
3615 int kvm_read_guest_virt(struct x86_emulate_ctxt *ctxt,
3616                                gva_t addr, void *val, unsigned int bytes,
3617                                struct x86_exception *exception)
3618 {
3619         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
3620         u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3621
3622         return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, access,
3623                                           exception);
3624 }
3625 EXPORT_SYMBOL_GPL(kvm_read_guest_virt);
3626
3627 static int kvm_read_guest_virt_system(struct x86_emulate_ctxt *ctxt,
3628                                       gva_t addr, void *val, unsigned int bytes,
3629                                       struct x86_exception *exception)
3630 {
3631         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
3632         return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, 0, exception);
3633 }
3634
3635 int kvm_write_guest_virt_system(struct x86_emulate_ctxt *ctxt,
3636                                        gva_t addr, void *val,
3637                                        unsigned int bytes,
3638                                        struct x86_exception *exception)
3639 {
3640         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
3641         void *data = val;
3642         int r = X86EMUL_CONTINUE;
3643
3644         while (bytes) {
3645                 gpa_t gpa =  vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr,
3646                                                              PFERR_WRITE_MASK,
3647                                                              exception);
3648                 unsigned offset = addr & (PAGE_SIZE-1);
3649                 unsigned towrite = min(bytes, (unsigned)PAGE_SIZE - offset);
3650                 int ret;
3651
3652                 if (gpa == UNMAPPED_GVA)
3653                         return X86EMUL_PROPAGATE_FAULT;
3654                 ret = kvm_write_guest(vcpu->kvm, gpa, data, towrite);
3655                 if (ret < 0) {
3656                         r = X86EMUL_IO_NEEDED;
3657                         goto out;
3658                 }
3659
3660                 bytes -= towrite;
3661                 data += towrite;
3662                 addr += towrite;
3663         }
3664 out:
3665         return r;
3666 }
3667 EXPORT_SYMBOL_GPL(kvm_write_guest_virt_system);
3668
3669 static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
3670                                 gpa_t *gpa, struct x86_exception *exception,
3671                                 bool write)
3672 {
3673         u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3674
3675         if (vcpu_match_mmio_gva(vcpu, gva) &&
3676                   check_write_user_access(vcpu, write, access,
3677                   vcpu->arch.access)) {
3678                 *gpa = vcpu->arch.mmio_gfn << PAGE_SHIFT |
3679                                         (gva & (PAGE_SIZE - 1));
3680                 trace_vcpu_match_mmio(gva, *gpa, write, false);
3681                 return 1;
3682         }
3683
3684         if (write)
3685                 access |= PFERR_WRITE_MASK;
3686
3687         *gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
3688
3689         if (*gpa == UNMAPPED_GVA)
3690                 return -1;
3691
3692         /* For APIC access vmexit */
3693         if ((*gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
3694                 return 1;
3695
3696         if (vcpu_match_mmio_gpa(vcpu, *gpa)) {
3697                 trace_vcpu_match_mmio(gva, *gpa, write, true);
3698                 return 1;
3699         }
3700
3701         return 0;
3702 }
3703
3704 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
3705                         const void *val, int bytes)
3706 {
3707         int ret;
3708
3709         ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
3710         if (ret < 0)
3711                 return 0;
3712         kvm_mmu_pte_write(vcpu, gpa, val, bytes);
3713         return 1;
3714 }
3715
3716 struct read_write_emulator_ops {
3717         int (*read_write_prepare)(struct kvm_vcpu *vcpu, void *val,
3718                                   int bytes);
3719         int (*read_write_emulate)(struct kvm_vcpu *vcpu, gpa_t gpa,
3720                                   void *val, int bytes);
3721         int (*read_write_mmio)(struct kvm_vcpu *vcpu, gpa_t gpa,
3722                                int bytes, void *val);
3723         int (*read_write_exit_mmio)(struct kvm_vcpu *vcpu, gpa_t gpa,
3724                                     void *val, int bytes);
3725         bool write;
3726 };
3727
3728 static int read_prepare(struct kvm_vcpu *vcpu, void *val, int bytes)
3729 {
3730         if (vcpu->mmio_read_completed) {
3731                 memcpy(val, vcpu->mmio_data, bytes);
3732                 trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes,
3733                                vcpu->mmio_phys_addr, *(u64 *)val);
3734                 vcpu->mmio_read_completed = 0;
3735                 return 1;
3736         }
3737
3738         return 0;
3739 }
3740
3741 static int read_emulate(struct kvm_vcpu *vcpu, gpa_t gpa,
3742                         void *val, int bytes)
3743 {
3744         return !kvm_read_guest(vcpu->kvm, gpa, val, bytes);
3745 }
3746
3747 static int write_emulate(struct kvm_vcpu *vcpu, gpa_t gpa,
3748                          void *val, int bytes)
3749 {
3750         return emulator_write_phys(vcpu, gpa, val, bytes);
3751 }
3752
3753 static int write_mmio(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes, void *val)
3754 {
3755         trace_kvm_mmio(KVM_TRACE_MMIO_WRITE, bytes, gpa, *(u64 *)val);
3756         return vcpu_mmio_write(vcpu, gpa, bytes, val);
3757 }
3758
3759 static int read_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa,
3760                           void *val, int bytes)
3761 {
3762         trace_kvm_mmio(KVM_TRACE_MMIO_READ_UNSATISFIED, bytes, gpa, 0);
3763         return X86EMUL_IO_NEEDED;
3764 }
3765
3766 static int write_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa,
3767                            void *val, int bytes)
3768 {
3769         memcpy(vcpu->mmio_data, val, bytes);
3770         memcpy(vcpu->run->mmio.data, vcpu->mmio_data, 8);
3771         return X86EMUL_CONTINUE;
3772 }
3773
3774 static struct read_write_emulator_ops read_emultor = {
3775         .read_write_prepare = read_prepare,
3776         .read_write_emulate = read_emulate,
3777         .read_write_mmio = vcpu_mmio_read,
3778         .read_write_exit_mmio = read_exit_mmio,
3779 };
3780
3781 static struct read_write_emulator_ops write_emultor = {
3782         .read_write_emulate = write_emulate,
3783         .read_write_mmio = write_mmio,
3784         .read_write_exit_mmio = write_exit_mmio,
3785         .write = true,
3786 };
3787
3788 static int emulator_read_write_onepage(unsigned long addr, void *val,
3789                                        unsigned int bytes,
3790                                        struct x86_exception *exception,
3791                                        struct kvm_vcpu *vcpu,
3792                                        struct read_write_emulator_ops *ops)
3793 {
3794         gpa_t gpa;
3795         int handled, ret;
3796         bool write = ops->write;
3797
3798         if (ops->read_write_prepare &&
3799                   ops->read_write_prepare(vcpu, val, bytes))
3800                 return X86EMUL_CONTINUE;
3801
3802         ret = vcpu_mmio_gva_to_gpa(vcpu, addr, &gpa, exception, write);
3803
3804         if (ret < 0)
3805                 return X86EMUL_PROPAGATE_FAULT;
3806
3807         /* For APIC access vmexit */
3808         if (ret)
3809                 goto mmio;
3810
3811         if (ops->read_write_emulate(vcpu, gpa, val, bytes))
3812                 return X86EMUL_CONTINUE;
3813
3814 mmio:
3815         /*
3816          * Is this MMIO handled locally?
3817          */
3818         handled = ops->read_write_mmio(vcpu, gpa, bytes, val);
3819         if (handled == bytes)
3820                 return X86EMUL_CONTINUE;
3821
3822         gpa += handled;
3823         bytes -= handled;
3824         val += handled;
3825
3826         vcpu->mmio_needed = 1;
3827         vcpu->run->exit_reason = KVM_EXIT_MMIO;
3828         vcpu->run->mmio.phys_addr = vcpu->mmio_phys_addr = gpa;
3829         vcpu->mmio_size = bytes;
3830         vcpu->run->mmio.len = min(vcpu->mmio_size, 8);
3831         vcpu->run->mmio.is_write = vcpu->mmio_is_write = write;
3832         vcpu->mmio_index = 0;
3833
3834         return ops->read_write_exit_mmio(vcpu, gpa, val, bytes);
3835 }
3836
3837 int emulator_read_write(struct x86_emulate_ctxt *ctxt, unsigned long addr,
3838                         void *val, unsigned int bytes,
3839                         struct x86_exception *exception,
3840                         struct read_write_emulator_ops *ops)
3841 {
3842         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
3843
3844         /* Crossing a page boundary? */
3845         if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
3846                 int rc, now;
3847
3848                 now = -addr & ~PAGE_MASK;
3849                 rc = emulator_read_write_onepage(addr, val, now, exception,
3850                                                  vcpu, ops);
3851
3852                 if (rc != X86EMUL_CONTINUE)
3853                         return rc;
3854                 addr += now;
3855                 val += now;
3856                 bytes -= now;
3857         }
3858
3859         return emulator_read_write_onepage(addr, val, bytes, exception,
3860                                            vcpu, ops);
3861 }
3862
3863 static int emulator_read_emulated(struct x86_emulate_ctxt *ctxt,
3864                                   unsigned long addr,
3865                                   void *val,
3866                                   unsigned int bytes,
3867                                   struct x86_exception *exception)
3868 {
3869         return emulator_read_write(ctxt, addr, val, bytes,
3870                                    exception, &read_emultor);
3871 }
3872
3873 int emulator_write_emulated(struct x86_emulate_ctxt *ctxt,
3874                             unsigned long addr,
3875                             const void *val,
3876                             unsigned int bytes,
3877                             struct x86_exception *exception)
3878 {
3879         return emulator_read_write(ctxt, addr, (void *)val, bytes,
3880                                    exception, &write_emultor);
3881 }
3882
3883 #define CMPXCHG_TYPE(t, ptr, old, new) \
3884         (cmpxchg((t *)(ptr), *(t *)(old), *(t *)(new)) == *(t *)(old))
3885
3886 #ifdef CONFIG_X86_64
3887 #  define CMPXCHG64(ptr, old, new) CMPXCHG_TYPE(u64, ptr, old, new)
3888 #else
3889 #  define CMPXCHG64(ptr, old, new) \
3890         (cmpxchg64((u64 *)(ptr), *(u64 *)(old), *(u64 *)(new)) == *(u64 *)(old))
3891 #endif
3892
3893 static int emulator_cmpxchg_emulated(struct x86_emulate_ctxt *ctxt,
3894                                      unsigned long addr,
3895                                      const void *old,
3896                                      const void *new,
3897                                      unsigned int bytes,
3898                                      struct x86_exception *exception)
3899 {
3900         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
3901         gpa_t gpa;
3902         struct page *page;
3903         char *kaddr;
3904         bool exchanged;
3905
3906         /* guests cmpxchg8b have to be emulated atomically */
3907         if (bytes > 8 || (bytes & (bytes - 1)))
3908                 goto emul_write;
3909
3910         gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, NULL);
3911
3912         if (gpa == UNMAPPED_GVA ||
3913             (gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
3914                 goto emul_write;
3915
3916         if (((gpa + bytes - 1) & PAGE_MASK) != (gpa & PAGE_MASK))
3917                 goto emul_write;
3918
3919         page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
3920         if (is_error_page(page)) {
3921                 kvm_release_page_clean(page);
3922                 goto emul_write;
3923         }
3924
3925         kaddr = kmap_atomic(page);
3926         kaddr += offset_in_page(gpa);
3927         switch (bytes) {
3928         case 1:
3929                 exchanged = CMPXCHG_TYPE(u8, kaddr, old, new);
3930                 break;
3931         case 2:
3932                 exchanged = CMPXCHG_TYPE(u16, kaddr, old, new);
3933                 break;
3934         case 4:
3935                 exchanged = CMPXCHG_TYPE(u32, kaddr, old, new);
3936                 break;
3937         case 8:
3938                 exchanged = CMPXCHG64(kaddr, old, new);
3939                 break;
3940         default:
3941                 BUG();
3942         }
3943         kunmap_atomic(kaddr);
3944         kvm_release_page_dirty(page);
3945
3946         if (!exchanged)
3947                 return X86EMUL_CMPXCHG_FAILED;
3948
3949         kvm_mmu_pte_write(vcpu, gpa, new, bytes);
3950
3951         return X86EMUL_CONTINUE;
3952
3953 emul_write:
3954         printk_once(KERN_WARNING "kvm: emulating exchange as write\n");
3955
3956         return emulator_write_emulated(ctxt, addr, new, bytes, exception);
3957 }
3958
3959 static int kernel_pio(struct kvm_vcpu *vcpu, void *pd)
3960 {
3961         /* TODO: String I/O for in kernel device */
3962         int r;
3963
3964         if (vcpu->arch.pio.in)
3965                 r = kvm_io_bus_read(vcpu->kvm, KVM_PIO_BUS, vcpu->arch.pio.port,
3966                                     vcpu->arch.pio.size, pd);
3967         else
3968                 r = kvm_io_bus_write(vcpu->kvm, KVM_PIO_BUS,
3969                                      vcpu->arch.pio.port, vcpu->arch.pio.size,
3970                                      pd);
3971         return r;
3972 }
3973
3974 static int emulator_pio_in_out(struct kvm_vcpu *vcpu, int size,
3975                                unsigned short port, void *val,
3976                                unsigned int count, bool in)
3977 {
3978         trace_kvm_pio(!in, port, size, count);
3979
3980         vcpu->arch.pio.port = port;
3981         vcpu->arch.pio.in = in;
3982         vcpu->arch.pio.count  = count;
3983         vcpu->arch.pio.size = size;
3984
3985         if (!kernel_pio(vcpu, vcpu->arch.pio_data)) {
3986                 vcpu->arch.pio.count = 0;
3987                 return 1;
3988         }
3989
3990         vcpu->run->exit_reason = KVM_EXIT_IO;
3991         vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
3992         vcpu->run->io.size = size;
3993         vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
3994         vcpu->run->io.count = count;
3995         vcpu->run->io.port = port;
3996
3997         return 0;
3998 }
3999
4000 static int emulator_pio_in_emulated(struct x86_emulate_ctxt *ctxt,
4001                                     int size, unsigned short port, void *val,
4002                                     unsigned int count)
4003 {
4004         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4005         int ret;
4006
4007         if (vcpu->arch.pio.count)
4008                 goto data_avail;
4009
4010         ret = emulator_pio_in_out(vcpu, size, port, val, count, true);
4011         if (ret) {
4012 data_avail:
4013                 memcpy(val, vcpu->arch.pio_data, size * count);
4014                 vcpu->arch.pio.count = 0;
4015                 return 1;
4016         }
4017
4018         return 0;
4019 }
4020
4021 static int emulator_pio_out_emulated(struct x86_emulate_ctxt *ctxt,
4022                                      int size, unsigned short port,
4023                                      const void *val, unsigned int count)
4024 {
4025         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4026
4027         memcpy(vcpu->arch.pio_data, val, size * count);
4028         return emulator_pio_in_out(vcpu, size, port, (void *)val, count, false);
4029 }
4030
4031 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
4032 {
4033         return kvm_x86_ops->get_segment_base(vcpu, seg);
4034 }
4035
4036 static void emulator_invlpg(struct x86_emulate_ctxt *ctxt, ulong address)
4037 {
4038         kvm_mmu_invlpg(emul_to_vcpu(ctxt), address);
4039 }
4040
4041 int kvm_emulate_wbinvd(struct kvm_vcpu *vcpu)
4042 {
4043         if (!need_emulate_wbinvd(vcpu))
4044                 return X86EMUL_CONTINUE;
4045
4046         if (kvm_x86_ops->has_wbinvd_exit()) {
4047                 int cpu = get_cpu();
4048
4049                 cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask);
4050                 smp_call_function_many(vcpu->arch.wbinvd_dirty_mask,
4051                                 wbinvd_ipi, NULL, 1);
4052                 put_cpu();
4053                 cpumask_clear(vcpu->arch.wbinvd_dirty_mask);
4054         } else
4055                 wbinvd();
4056         return X86EMUL_CONTINUE;
4057 }
4058 EXPORT_SYMBOL_GPL(kvm_emulate_wbinvd);
4059
4060 static void emulator_wbinvd(struct x86_emulate_ctxt *ctxt)
4061 {
4062         kvm_emulate_wbinvd(emul_to_vcpu(ctxt));
4063 }
4064
4065 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest)
4066 {
4067         return _kvm_get_dr(emul_to_vcpu(ctxt), dr, dest);
4068 }
4069
4070 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
4071 {
4072
4073         return __kvm_set_dr(emul_to_vcpu(ctxt), dr, value);
4074 }
4075
4076 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
4077 {
4078         return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
4079 }
4080
4081 static unsigned long emulator_get_cr(struct x86_emulate_ctxt *ctxt, int cr)
4082 {
4083         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4084         unsigned long value;
4085
4086         switch (cr) {
4087         case 0:
4088                 value = kvm_read_cr0(vcpu);
4089                 break;
4090         case 2:
4091                 value = vcpu->arch.cr2;
4092                 break;
4093         case 3:
4094                 value = kvm_read_cr3(vcpu);
4095                 break;
4096         case 4:
4097                 value = kvm_read_cr4(vcpu);
4098                 break;
4099         case 8:
4100                 value = kvm_get_cr8(vcpu);
4101                 break;
4102         default:
4103                 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr);
4104                 return 0;
4105         }
4106
4107         return value;
4108 }
4109
4110 static int emulator_set_cr(struct x86_emulate_ctxt *ctxt, int cr, ulong val)
4111 {
4112         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4113         int res = 0;
4114
4115         switch (cr) {
4116         case 0:
4117                 res = kvm_set_cr0(vcpu, mk_cr_64(kvm_read_cr0(vcpu), val));
4118                 break;
4119         case 2:
4120                 vcpu->arch.cr2 = val;
4121                 break;
4122         case 3:
4123                 res = kvm_set_cr3(vcpu, val);
4124                 break;
4125         case 4:
4126                 res = kvm_set_cr4(vcpu, mk_cr_64(kvm_read_cr4(vcpu), val));
4127                 break;
4128         case 8:
4129                 res = kvm_set_cr8(vcpu, val);
4130                 break;
4131         default:
4132                 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr);
4133                 res = -1;
4134         }
4135
4136         return res;
4137 }
4138
4139 static void emulator_set_rflags(struct x86_emulate_ctxt *ctxt, ulong val)
4140 {
4141         kvm_set_rflags(emul_to_vcpu(ctxt), val);
4142 }
4143
4144 static int emulator_get_cpl(struct x86_emulate_ctxt *ctxt)
4145 {
4146         return kvm_x86_ops->get_cpl(emul_to_vcpu(ctxt));
4147 }
4148
4149 static void emulator_get_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
4150 {
4151         kvm_x86_ops->get_gdt(emul_to_vcpu(ctxt), dt);
4152 }
4153
4154 static void emulator_get_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
4155 {
4156         kvm_x86_ops->get_idt(emul_to_vcpu(ctxt), dt);
4157 }
4158
4159 static void emulator_set_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
4160 {
4161         kvm_x86_ops->set_gdt(emul_to_vcpu(ctxt), dt);
4162 }
4163
4164 static void emulator_set_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
4165 {
4166         kvm_x86_ops->set_idt(emul_to_vcpu(ctxt), dt);
4167 }
4168
4169 static unsigned long emulator_get_cached_segment_base(
4170         struct x86_emulate_ctxt *ctxt, int seg)
4171 {
4172         return get_segment_base(emul_to_vcpu(ctxt), seg);
4173 }
4174
4175 static bool emulator_get_segment(struct x86_emulate_ctxt *ctxt, u16 *selector,
4176                                  struct desc_struct *desc, u32 *base3,
4177                                  int seg)
4178 {
4179         struct kvm_segment var;
4180
4181         kvm_get_segment(emul_to_vcpu(ctxt), &var, seg);
4182         *selector = var.selector;
4183
4184         if (var.unusable)
4185                 return false;
4186
4187         if (var.g)
4188                 var.limit >>= 12;
4189         set_desc_limit(desc, var.limit);
4190         set_desc_base(desc, (unsigned long)var.base);
4191 #ifdef CONFIG_X86_64
4192         if (base3)
4193                 *base3 = var.base >> 32;
4194 #endif
4195         desc->type = var.type;
4196         desc->s = var.s;
4197         desc->dpl = var.dpl;
4198         desc->p = var.present;
4199         desc->avl = var.avl;
4200         desc->l = var.l;
4201         desc->d = var.db;
4202         desc->g = var.g;
4203
4204         return true;
4205 }
4206
4207 static void emulator_set_segment(struct x86_emulate_ctxt *ctxt, u16 selector,
4208                                  struct desc_struct *desc, u32 base3,
4209                                  int seg)
4210 {
4211         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4212         struct kvm_segment var;
4213
4214         var.selector = selector;
4215         var.base = get_desc_base(desc);
4216 #ifdef CONFIG_X86_64
4217         var.base |= ((u64)base3) << 32;
4218 #endif
4219         var.limit = get_desc_limit(desc);
4220         if (desc->g)
4221                 var.limit = (var.limit << 12) | 0xfff;
4222         var.type = desc->type;
4223         var.present = desc->p;
4224         var.dpl = desc->dpl;
4225         var.db = desc->d;
4226         var.s = desc->s;
4227         var.l = desc->l;
4228         var.g = desc->g;
4229         var.avl = desc->avl;
4230         var.present = desc->p;
4231         var.unusable = !var.present;
4232         var.padding = 0;
4233
4234         kvm_set_segment(vcpu, &var, seg);
4235         return;
4236 }
4237
4238 static int emulator_get_msr(struct x86_emulate_ctxt *ctxt,
4239                             u32 msr_index, u64 *pdata)
4240 {
4241         return kvm_get_msr(emul_to_vcpu(ctxt), msr_index, pdata);
4242 }
4243
4244 static int emulator_set_msr(struct x86_emulate_ctxt *ctxt,
4245                             u32 msr_index, u64 data)
4246 {
4247         return kvm_set_msr(emul_to_vcpu(ctxt), msr_index, data);
4248 }
4249
4250 static int emulator_read_pmc(struct x86_emulate_ctxt *ctxt,
4251                              u32 pmc, u64 *pdata)
4252 {
4253         return kvm_pmu_read_pmc(emul_to_vcpu(ctxt), pmc, pdata);
4254 }
4255
4256 static void emulator_halt(struct x86_emulate_ctxt *ctxt)
4257 {
4258         emul_to_vcpu(ctxt)->arch.halt_request = 1;
4259 }
4260
4261 static void emulator_get_fpu(struct x86_emulate_ctxt *ctxt)
4262 {
4263         preempt_disable();
4264         kvm_load_guest_fpu(emul_to_vcpu(ctxt));
4265         /*
4266          * CR0.TS may reference the host fpu state, not the guest fpu state,
4267          * so it may be clear at this point.
4268          */
4269         clts();
4270 }
4271
4272 static void emulator_put_fpu(struct x86_emulate_ctxt *ctxt)
4273 {
4274         preempt_enable();
4275 }
4276
4277 static int emulator_intercept(struct x86_emulate_ctxt *ctxt,
4278                               struct x86_instruction_info *info,
4279                               enum x86_intercept_stage stage)
4280 {
4281         return kvm_x86_ops->check_intercept(emul_to_vcpu(ctxt), info, stage);
4282 }
4283
4284 static bool emulator_get_cpuid(struct x86_emulate_ctxt *ctxt,
4285                                u32 *eax, u32 *ebx, u32 *ecx, u32 *edx)
4286 {
4287         struct kvm_cpuid_entry2 *cpuid = NULL;
4288
4289         if (eax && ecx)
4290                 cpuid = kvm_find_cpuid_entry(emul_to_vcpu(ctxt),
4291                                             *eax, *ecx);
4292
4293         if (cpuid) {
4294                 *eax = cpuid->eax;
4295                 *ecx = cpuid->ecx;
4296                 if (ebx)
4297                         *ebx = cpuid->ebx;
4298                 if (edx)
4299                         *edx = cpuid->edx;
4300                 return true;
4301         }
4302
4303         return false;
4304 }
4305
4306 static struct x86_emulate_ops emulate_ops = {
4307         .read_std            = kvm_read_guest_virt_system,
4308         .write_std           = kvm_write_guest_virt_system,
4309         .fetch               = kvm_fetch_guest_virt,
4310         .read_emulated       = emulator_read_emulated,
4311         .write_emulated      = emulator_write_emulated,
4312         .cmpxchg_emulated    = emulator_cmpxchg_emulated,
4313         .invlpg              = emulator_invlpg,
4314         .pio_in_emulated     = emulator_pio_in_emulated,
4315         .pio_out_emulated    = emulator_pio_out_emulated,
4316         .get_segment         = emulator_get_segment,
4317         .set_segment         = emulator_set_segment,
4318         .get_cached_segment_base = emulator_get_cached_segment_base,
4319         .get_gdt             = emulator_get_gdt,
4320         .get_idt             = emulator_get_idt,
4321         .set_gdt             = emulator_set_gdt,
4322         .set_idt             = emulator_set_idt,
4323         .get_cr              = emulator_get_cr,
4324         .set_cr              = emulator_set_cr,
4325         .set_rflags          = emulator_set_rflags,
4326         .cpl                 = emulator_get_cpl,
4327         .get_dr              = emulator_get_dr,
4328         .set_dr              = emulator_set_dr,
4329         .set_msr             = emulator_set_msr,
4330         .get_msr             = emulator_get_msr,
4331         .read_pmc            = emulator_read_pmc,
4332         .halt                = emulator_halt,
4333         .wbinvd              = emulator_wbinvd,
4334         .fix_hypercall       = emulator_fix_hypercall,
4335         .get_fpu             = emulator_get_fpu,
4336         .put_fpu             = emulator_put_fpu,
4337         .intercept           = emulator_intercept,
4338         .get_cpuid           = emulator_get_cpuid,
4339 };
4340
4341 static void cache_all_regs(struct kvm_vcpu *vcpu)
4342 {
4343         kvm_register_read(vcpu, VCPU_REGS_RAX);
4344         kvm_register_read(vcpu, VCPU_REGS_RSP);
4345         kvm_register_read(vcpu, VCPU_REGS_RIP);
4346         vcpu->arch.regs_dirty = ~0;
4347 }
4348
4349 static void toggle_interruptibility(struct kvm_vcpu *vcpu, u32 mask)
4350 {
4351         u32 int_shadow = kvm_x86_ops->get_interrupt_shadow(vcpu, mask);
4352         /*
4353          * an sti; sti; sequence only disable interrupts for the first
4354          * instruction. So, if the last instruction, be it emulated or
4355          * not, left the system with the INT_STI flag enabled, it
4356          * means that the last instruction is an sti. We should not
4357          * leave the flag on in this case. The same goes for mov ss
4358          */
4359         if (!(int_shadow & mask))
4360                 kvm_x86_ops->set_interrupt_shadow(vcpu, mask);
4361 }
4362
4363 static void inject_emulated_exception(struct kvm_vcpu *vcpu)
4364 {
4365         struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
4366         if (ctxt->exception.vector == PF_VECTOR)
4367                 kvm_propagate_fault(vcpu, &ctxt->exception);
4368         else if (ctxt->exception.error_code_valid)
4369                 kvm_queue_exception_e(vcpu, ctxt->exception.vector,
4370                                       ctxt->exception.error_code);
4371         else
4372                 kvm_queue_exception(vcpu, ctxt->exception.vector);
4373 }
4374
4375 static void init_decode_cache(struct x86_emulate_ctxt *ctxt,
4376                               const unsigned long *regs)
4377 {
4378         memset(&ctxt->twobyte, 0,
4379                (void *)&ctxt->regs - (void *)&ctxt->twobyte);
4380         memcpy(ctxt->regs, regs, sizeof(ctxt->regs));
4381
4382         ctxt->fetch.start = 0;
4383         ctxt->fetch.end = 0;
4384         ctxt->io_read.pos = 0;
4385         ctxt->io_read.end = 0;
4386         ctxt->mem_read.pos = 0;
4387         ctxt->mem_read.end = 0;
4388 }
4389
4390 static void init_emulate_ctxt(struct kvm_vcpu *vcpu)
4391 {
4392         struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
4393         int cs_db, cs_l;
4394
4395         /*
4396          * TODO: fix emulate.c to use guest_read/write_register
4397          * instead of direct ->regs accesses, can save hundred cycles
4398          * on Intel for instructions that don't read/change RSP, for
4399          * for example.
4400          */
4401         cache_all_regs(vcpu);
4402
4403         kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
4404
4405         ctxt->eflags = kvm_get_rflags(vcpu);
4406         ctxt->eip = kvm_rip_read(vcpu);
4407         ctxt->mode = (!is_protmode(vcpu))               ? X86EMUL_MODE_REAL :
4408                      (ctxt->eflags & X86_EFLAGS_VM)     ? X86EMUL_MODE_VM86 :
4409                      cs_l                               ? X86EMUL_MODE_PROT64 :
4410                      cs_db                              ? X86EMUL_MODE_PROT32 :
4411                                                           X86EMUL_MODE_PROT16;
4412         ctxt->guest_mode = is_guest_mode(vcpu);
4413
4414         init_decode_cache(ctxt, vcpu->arch.regs);
4415         vcpu->arch.emulate_regs_need_sync_from_vcpu = false;
4416 }
4417
4418 int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip)
4419 {
4420         struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
4421         int ret;
4422
4423         init_emulate_ctxt(vcpu);
4424
4425         ctxt->op_bytes = 2;
4426         ctxt->ad_bytes = 2;
4427         ctxt->_eip = ctxt->eip + inc_eip;
4428         ret = emulate_int_real(ctxt, irq);
4429
4430         if (ret != X86EMUL_CONTINUE)
4431                 return EMULATE_FAIL;
4432
4433         ctxt->eip = ctxt->_eip;
4434         memcpy(vcpu->arch.regs, ctxt->regs, sizeof ctxt->regs);
4435         kvm_rip_write(vcpu, ctxt->eip);
4436         kvm_set_rflags(vcpu, ctxt->eflags);
4437
4438         if (irq == NMI_VECTOR)
4439                 vcpu->arch.nmi_pending = 0;
4440         else
4441                 vcpu->arch.interrupt.pending = false;
4442
4443         return EMULATE_DONE;
4444 }
4445 EXPORT_SYMBOL_GPL(kvm_inject_realmode_interrupt);
4446
4447 static int handle_emulation_failure(struct kvm_vcpu *vcpu)
4448 {
4449         int r = EMULATE_DONE;
4450
4451         ++vcpu->stat.insn_emulation_fail;
4452         trace_kvm_emulate_insn_failed(vcpu);
4453         if (!is_guest_mode(vcpu)) {
4454                 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
4455                 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
4456                 vcpu->run->internal.ndata = 0;
4457                 r = EMULATE_FAIL;
4458         }
4459         kvm_queue_exception(vcpu, UD_VECTOR);
4460
4461         return r;
4462 }
4463
4464 static bool reexecute_instruction(struct kvm_vcpu *vcpu, gva_t gva)
4465 {
4466         gpa_t gpa;
4467
4468         if (tdp_enabled)
4469                 return false;
4470
4471         /*
4472          * if emulation was due to access to shadowed page table
4473          * and it failed try to unshadow page and re-entetr the
4474          * guest to let CPU execute the instruction.
4475          */
4476         if (kvm_mmu_unprotect_page_virt(vcpu, gva))
4477                 return true;
4478
4479         gpa = kvm_mmu_gva_to_gpa_system(vcpu, gva, NULL);
4480
4481         if (gpa == UNMAPPED_GVA)
4482                 return true; /* let cpu generate fault */
4483
4484         if (!kvm_is_error_hva(gfn_to_hva(vcpu->kvm, gpa >> PAGE_SHIFT)))
4485                 return true;
4486
4487         return false;
4488 }
4489
4490 static bool retry_instruction(struct x86_emulate_ctxt *ctxt,
4491                               unsigned long cr2,  int emulation_type)
4492 {
4493         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4494         unsigned long last_retry_eip, last_retry_addr, gpa = cr2;
4495
4496         last_retry_eip = vcpu->arch.last_retry_eip;
4497         last_retry_addr = vcpu->arch.last_retry_addr;
4498
4499         /*
4500          * If the emulation is caused by #PF and it is non-page_table
4501          * writing instruction, it means the VM-EXIT is caused by shadow
4502          * page protected, we can zap the shadow page and retry this
4503          * instruction directly.
4504          *
4505          * Note: if the guest uses a non-page-table modifying instruction
4506          * on the PDE that points to the instruction, then we will unmap
4507          * the instruction and go to an infinite loop. So, we cache the
4508          * last retried eip and the last fault address, if we meet the eip
4509          * and the address again, we can break out of the potential infinite
4510          * loop.
4511          */
4512         vcpu->arch.last_retry_eip = vcpu->arch.last_retry_addr = 0;
4513
4514         if (!(emulation_type & EMULTYPE_RETRY))
4515                 return false;
4516
4517         if (x86_page_table_writing_insn(ctxt))
4518                 return false;
4519
4520         if (ctxt->eip == last_retry_eip && last_retry_addr == cr2)
4521                 return false;
4522
4523         vcpu->arch.last_retry_eip = ctxt->eip;
4524         vcpu->arch.last_retry_addr = cr2;
4525
4526         if (!vcpu->arch.mmu.direct_map)
4527                 gpa = kvm_mmu_gva_to_gpa_write(vcpu, cr2, NULL);
4528
4529         kvm_mmu_unprotect_page(vcpu->kvm, gpa >> PAGE_SHIFT);
4530
4531         return true;
4532 }
4533
4534 int x86_emulate_instruction(struct kvm_vcpu *vcpu,
4535                             unsigned long cr2,
4536                             int emulation_type,
4537                             void *insn,
4538                             int insn_len)
4539 {
4540         int r;
4541         struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
4542         bool writeback = true;
4543
4544         kvm_clear_exception_queue(vcpu);
4545
4546         if (!(emulation_type & EMULTYPE_NO_DECODE)) {
4547                 init_emulate_ctxt(vcpu);
4548                 ctxt->interruptibility = 0;
4549                 ctxt->have_exception = false;
4550                 ctxt->perm_ok = false;
4551
4552                 ctxt->only_vendor_specific_insn
4553                         = emulation_type & EMULTYPE_TRAP_UD;
4554
4555                 r = x86_decode_insn(ctxt, insn, insn_len);
4556
4557                 trace_kvm_emulate_insn_start(vcpu);
4558                 ++vcpu->stat.insn_emulation;
4559                 if (r != EMULATION_OK)  {
4560                         if (emulation_type & EMULTYPE_TRAP_UD)
4561                                 return EMULATE_FAIL;
4562                         if (reexecute_instruction(vcpu, cr2))
4563                                 return EMULATE_DONE;
4564                         if (emulation_type & EMULTYPE_SKIP)
4565                                 return EMULATE_FAIL;
4566                         return handle_emulation_failure(vcpu);
4567                 }
4568         }
4569
4570         if (emulation_type & EMULTYPE_SKIP) {
4571                 kvm_rip_write(vcpu, ctxt->_eip);
4572                 return EMULATE_DONE;
4573         }
4574
4575         if (retry_instruction(ctxt, cr2, emulation_type))
4576                 return EMULATE_DONE;
4577
4578         /* this is needed for vmware backdoor interface to work since it
4579            changes registers values  during IO operation */
4580         if (vcpu->arch.emulate_regs_need_sync_from_vcpu) {
4581                 vcpu->arch.emulate_regs_need_sync_from_vcpu = false;
4582                 memcpy(ctxt->regs, vcpu->arch.regs, sizeof ctxt->regs);
4583         }
4584
4585 restart:
4586         r = x86_emulate_insn(ctxt);
4587
4588         if (r == EMULATION_INTERCEPTED)
4589                 return EMULATE_DONE;
4590
4591         if (r == EMULATION_FAILED) {
4592                 if (reexecute_instruction(vcpu, cr2))
4593                         return EMULATE_DONE;
4594
4595                 return handle_emulation_failure(vcpu);
4596         }
4597
4598         if (ctxt->have_exception) {
4599                 inject_emulated_exception(vcpu);
4600                 r = EMULATE_DONE;
4601         } else if (vcpu->arch.pio.count) {
4602                 if (!vcpu->arch.pio.in)
4603                         vcpu->arch.pio.count = 0;
4604                 else
4605                         writeback = false;
4606                 r = EMULATE_DO_MMIO;
4607         } else if (vcpu->mmio_needed) {
4608                 if (!vcpu->mmio_is_write)
4609                         writeback = false;
4610                 r = EMULATE_DO_MMIO;
4611         } else if (r == EMULATION_RESTART)
4612                 goto restart;
4613         else
4614                 r = EMULATE_DONE;
4615
4616         if (writeback) {
4617                 toggle_interruptibility(vcpu, ctxt->interruptibility);
4618                 kvm_set_rflags(vcpu, ctxt->eflags);
4619                 kvm_make_request(KVM_REQ_EVENT, vcpu);
4620                 memcpy(vcpu->arch.regs, ctxt->regs, sizeof ctxt->regs);
4621                 vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
4622                 kvm_rip_write(vcpu, ctxt->eip);
4623         } else
4624                 vcpu->arch.emulate_regs_need_sync_to_vcpu = true;
4625
4626         return r;
4627 }
4628 EXPORT_SYMBOL_GPL(x86_emulate_instruction);
4629
4630 int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size, unsigned short port)
4631 {
4632         unsigned long val = kvm_register_read(vcpu, VCPU_REGS_RAX);
4633         int ret = emulator_pio_out_emulated(&vcpu->arch.emulate_ctxt,
4634                                             size, port, &val, 1);
4635         /* do not return to emulator after return from userspace */
4636         vcpu->arch.pio.count = 0;
4637         return ret;
4638 }
4639 EXPORT_SYMBOL_GPL(kvm_fast_pio_out);
4640
4641 static void tsc_bad(void *info)
4642 {
4643         __this_cpu_write(cpu_tsc_khz, 0);
4644 }
4645
4646 static void tsc_khz_changed(void *data)
4647 {
4648         struct cpufreq_freqs *freq = data;
4649         unsigned long khz = 0;
4650
4651         if (data)
4652                 khz = freq->new;
4653         else if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
4654                 khz = cpufreq_quick_get(raw_smp_processor_id());
4655         if (!khz)
4656                 khz = tsc_khz;
4657         __this_cpu_write(cpu_tsc_khz, khz);
4658 }
4659
4660 static int kvmclock_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
4661                                      void *data)
4662 {
4663         struct cpufreq_freqs *freq = data;
4664         struct kvm *kvm;
4665         struct kvm_vcpu *vcpu;
4666         int i, send_ipi = 0;
4667
4668         /*
4669          * We allow guests to temporarily run on slowing clocks,
4670          * provided we notify them after, or to run on accelerating
4671          * clocks, provided we notify them before.  Thus time never
4672          * goes backwards.
4673          *
4674          * However, we have a problem.  We can't atomically update
4675          * the frequency of a given CPU from this function; it is
4676          * merely a notifier, which can be called from any CPU.
4677          * Changing the TSC frequency at arbitrary points in time
4678          * requires a recomputation of local variables related to
4679          * the TSC for each VCPU.  We must flag these local variables
4680          * to be updated and be sure the update takes place with the
4681          * new frequency before any guests proceed.
4682          *
4683          * Unfortunately, the combination of hotplug CPU and frequency
4684          * change creates an intractable locking scenario; the order
4685          * of when these callouts happen is undefined with respect to
4686          * CPU hotplug, and they can race with each other.  As such,
4687          * merely setting per_cpu(cpu_tsc_khz) = X during a hotadd is
4688          * undefined; you can actually have a CPU frequency change take
4689          * place in between the computation of X and the setting of the
4690          * variable.  To protect against this problem, all updates of
4691          * the per_cpu tsc_khz variable are done in an interrupt
4692          * protected IPI, and all callers wishing to update the value
4693          * must wait for a synchronous IPI to complete (which is trivial
4694          * if the caller is on the CPU already).  This establishes the
4695          * necessary total order on variable updates.
4696          *
4697          * Note that because a guest time update may take place
4698          * anytime after the setting of the VCPU's request bit, the
4699          * correct TSC value must be set before the request.  However,
4700          * to ensure the update actually makes it to any guest which
4701          * starts running in hardware virtualization between the set
4702          * and the acquisition of the spinlock, we must also ping the
4703          * CPU after setting the request bit.
4704          *
4705          */
4706
4707         if (val == CPUFREQ_PRECHANGE && freq->old > freq->new)
4708                 return 0;
4709         if (val == CPUFREQ_POSTCHANGE && freq->old < freq->new)
4710                 return 0;
4711
4712         smp_call_function_single(freq->cpu, tsc_khz_changed, freq, 1);
4713
4714         raw_spin_lock(&kvm_lock);
4715         list_for_each_entry(kvm, &vm_list, vm_list) {
4716                 kvm_for_each_vcpu(i, vcpu, kvm) {
4717                         if (vcpu->cpu != freq->cpu)
4718                                 continue;
4719                         kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
4720                         if (vcpu->cpu != smp_processor_id())
4721                                 send_ipi = 1;
4722                 }
4723         }
4724         raw_spin_unlock(&kvm_lock);
4725
4726         if (freq->old < freq->new && send_ipi) {
4727                 /*
4728                  * We upscale the frequency.  Must make the guest
4729                  * doesn't see old kvmclock values while running with
4730                  * the new frequency, otherwise we risk the guest sees
4731                  * time go backwards.
4732                  *
4733                  * In case we update the frequency for another cpu
4734                  * (which might be in guest context) send an interrupt
4735                  * to kick the cpu out of guest context.  Next time
4736                  * guest context is entered kvmclock will be updated,
4737                  * so the guest will not see stale values.
4738                  */
4739                 smp_call_function_single(freq->cpu, tsc_khz_changed, freq, 1);
4740         }
4741         return 0;
4742 }
4743
4744 static struct notifier_block kvmclock_cpufreq_notifier_block = {
4745         .notifier_call  = kvmclock_cpufreq_notifier
4746 };
4747
4748 static int kvmclock_cpu_notifier(struct notifier_block *nfb,
4749                                         unsigned long action, void *hcpu)
4750 {
4751         unsigned int cpu = (unsigned long)hcpu;
4752
4753         switch (action) {
4754                 case CPU_ONLINE:
4755                 case CPU_DOWN_FAILED:
4756                         smp_call_function_single(cpu, tsc_khz_changed, NULL, 1);
4757                         break;
4758                 case CPU_DOWN_PREPARE:
4759                         smp_call_function_single(cpu, tsc_bad, NULL, 1);
4760                         break;
4761         }
4762         return NOTIFY_OK;
4763 }
4764
4765 static struct notifier_block kvmclock_cpu_notifier_block = {
4766         .notifier_call  = kvmclock_cpu_notifier,
4767         .priority = -INT_MAX
4768 };
4769
4770 static void kvm_timer_init(void)
4771 {
4772         int cpu;
4773
4774         max_tsc_khz = tsc_khz;
4775         register_hotcpu_notifier(&kvmclock_cpu_notifier_block);
4776         if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) {
4777 #ifdef CONFIG_CPU_FREQ
4778                 struct cpufreq_policy policy;
4779                 memset(&policy, 0, sizeof(policy));
4780                 cpu = get_cpu();
4781                 cpufreq_get_policy(&policy, cpu);
4782                 if (policy.cpuinfo.max_freq)
4783                         max_tsc_khz = policy.cpuinfo.max_freq;
4784                 put_cpu();
4785 #endif
4786                 cpufreq_register_notifier(&kvmclock_cpufreq_notifier_block,
4787                                           CPUFREQ_TRANSITION_NOTIFIER);
4788         }
4789         pr_debug("kvm: max_tsc_khz = %ld\n", max_tsc_khz);
4790         for_each_online_cpu(cpu)
4791                 smp_call_function_single(cpu, tsc_khz_changed, NULL, 1);
4792 }
4793
4794 static DEFINE_PER_CPU(struct kvm_vcpu *, current_vcpu);
4795
4796 int kvm_is_in_guest(void)
4797 {
4798         return __this_cpu_read(current_vcpu) != NULL;
4799 }
4800
4801 static int kvm_is_user_mode(void)
4802 {
4803         int user_mode = 3;
4804
4805         if (__this_cpu_read(current_vcpu))
4806                 user_mode = kvm_x86_ops->get_cpl(__this_cpu_read(current_vcpu));
4807
4808         return user_mode != 0;
4809 }
4810
4811 static unsigned long kvm_get_guest_ip(void)
4812 {
4813         unsigned long ip = 0;
4814
4815         if (__this_cpu_read(current_vcpu))
4816                 ip = kvm_rip_read(__this_cpu_read(current_vcpu));
4817
4818         return ip;
4819 }
4820
4821 static struct perf_guest_info_callbacks kvm_guest_cbs = {
4822         .is_in_guest            = kvm_is_in_guest,
4823         .is_user_mode           = kvm_is_user_mode,
4824         .get_guest_ip           = kvm_get_guest_ip,
4825 };
4826
4827 void kvm_before_handle_nmi(struct kvm_vcpu *vcpu)
4828 {
4829         __this_cpu_write(current_vcpu, vcpu);
4830 }
4831 EXPORT_SYMBOL_GPL(kvm_before_handle_nmi);
4832
4833 void kvm_after_handle_nmi(struct kvm_vcpu *vcpu)
4834 {
4835         __this_cpu_write(current_vcpu, NULL);
4836 }
4837 EXPORT_SYMBOL_GPL(kvm_after_handle_nmi);
4838
4839 static void kvm_set_mmio_spte_mask(void)
4840 {
4841         u64 mask;
4842         int maxphyaddr = boot_cpu_data.x86_phys_bits;
4843
4844         /*
4845          * Set the reserved bits and the present bit of an paging-structure
4846          * entry to generate page fault with PFER.RSV = 1.
4847          */
4848         mask = ((1ull << (62 - maxphyaddr + 1)) - 1) << maxphyaddr;
4849         mask |= 1ull;
4850
4851 #ifdef CONFIG_X86_64
4852         /*
4853          * If reserved bit is not supported, clear the present bit to disable
4854          * mmio page fault.
4855          */
4856         if (maxphyaddr == 52)
4857                 mask &= ~1ull;
4858 #endif
4859
4860         kvm_mmu_set_mmio_spte_mask(mask);
4861 }
4862
4863 int kvm_arch_init(void *opaque)
4864 {
4865         int r;
4866         struct kvm_x86_ops *ops = (struct kvm_x86_ops *)opaque;
4867
4868         if (kvm_x86_ops) {
4869                 printk(KERN_ERR "kvm: already loaded the other module\n");
4870                 r = -EEXIST;
4871                 goto out;
4872         }
4873
4874         if (!ops->cpu_has_kvm_support()) {
4875                 printk(KERN_ERR "kvm: no hardware support\n");
4876                 r = -EOPNOTSUPP;
4877                 goto out;
4878         }
4879         if (ops->disabled_by_bios()) {
4880                 printk(KERN_ERR "kvm: disabled by bios\n");
4881                 r = -EOPNOTSUPP;
4882                 goto out;
4883         }
4884
4885         r = kvm_mmu_module_init();
4886         if (r)
4887                 goto out;
4888
4889         kvm_set_mmio_spte_mask();
4890         kvm_init_msr_list();
4891
4892         kvm_x86_ops = ops;
4893         kvm_mmu_set_mask_ptes(PT_USER_MASK, PT_ACCESSED_MASK,
4894                         PT_DIRTY_MASK, PT64_NX_MASK, 0);
4895
4896         kvm_timer_init();
4897
4898         perf_register_guest_info_callbacks(&kvm_guest_cbs);
4899
4900         if (cpu_has_xsave)
4901                 host_xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
4902
4903         return 0;
4904
4905 out:
4906         return r;
4907 }
4908
4909 void kvm_arch_exit(void)
4910 {
4911         perf_unregister_guest_info_callbacks(&kvm_guest_cbs);
4912
4913         if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
4914                 cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block,
4915                                             CPUFREQ_TRANSITION_NOTIFIER);
4916         unregister_hotcpu_notifier(&kvmclock_cpu_notifier_block);
4917         kvm_x86_ops = NULL;
4918         kvm_mmu_module_exit();
4919 }
4920
4921 int kvm_emulate_halt(struct kvm_vcpu *vcpu)
4922 {
4923         ++vcpu->stat.halt_exits;
4924         if (irqchip_in_kernel(vcpu->kvm)) {
4925                 vcpu->arch.mp_state = KVM_MP_STATE_HALTED;
4926                 return 1;
4927         } else {
4928                 vcpu->run->exit_reason = KVM_EXIT_HLT;
4929                 return 0;
4930         }
4931 }
4932 EXPORT_SYMBOL_GPL(kvm_emulate_halt);
4933
4934 int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
4935 {
4936         u64 param, ingpa, outgpa, ret;
4937         uint16_t code, rep_idx, rep_cnt, res = HV_STATUS_SUCCESS, rep_done = 0;
4938         bool fast, longmode;
4939         int cs_db, cs_l;
4940
4941         /*
4942          * hypercall generates UD from non zero cpl and real mode
4943          * per HYPER-V spec
4944          */
4945         if (kvm_x86_ops->get_cpl(vcpu) != 0 || !is_protmode(vcpu)) {
4946                 kvm_queue_exception(vcpu, UD_VECTOR);
4947                 return 0;
4948         }
4949
4950         kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
4951         longmode = is_long_mode(vcpu) && cs_l == 1;
4952
4953         if (!longmode) {
4954                 param = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDX) << 32) |
4955                         (kvm_register_read(vcpu, VCPU_REGS_RAX) & 0xffffffff);
4956                 ingpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RBX) << 32) |
4957                         (kvm_register_read(vcpu, VCPU_REGS_RCX) & 0xffffffff);
4958                 outgpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDI) << 32) |
4959                         (kvm_register_read(vcpu, VCPU_REGS_RSI) & 0xffffffff);
4960         }
4961 #ifdef CONFIG_X86_64
4962         else {
4963                 param = kvm_register_read(vcpu, VCPU_REGS_RCX);
4964                 ingpa = kvm_register_read(vcpu, VCPU_REGS_RDX);
4965                 outgpa = kvm_register_read(vcpu, VCPU_REGS_R8);
4966         }
4967 #endif
4968
4969         code = param & 0xffff;
4970         fast = (param >> 16) & 0x1;
4971         rep_cnt = (param >> 32) & 0xfff;
4972         rep_idx = (param >> 48) & 0xfff;
4973
4974         trace_kvm_hv_hypercall(code, fast, rep_cnt, rep_idx, ingpa, outgpa);
4975
4976         switch (code) {
4977         case HV_X64_HV_NOTIFY_LONG_SPIN_WAIT:
4978                 kvm_vcpu_on_spin(vcpu);
4979                 break;
4980         default:
4981                 res = HV_STATUS_INVALID_HYPERCALL_CODE;
4982                 break;
4983         }
4984
4985         ret = res | (((u64)rep_done & 0xfff) << 32);
4986         if (longmode) {
4987                 kvm_register_write(vcpu, VCPU_REGS_RAX, ret);
4988         } else {
4989                 kvm_register_write(vcpu, VCPU_REGS_RDX, ret >> 32);
4990                 kvm_register_write(vcpu, VCPU_REGS_RAX, ret & 0xffffffff);
4991         }
4992
4993         return 1;
4994 }
4995
4996 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
4997 {
4998         unsigned long nr, a0, a1, a2, a3, ret;
4999         int r = 1;
5000
5001         if (kvm_hv_hypercall_enabled(vcpu->kvm))
5002                 return kvm_hv_hypercall(vcpu);
5003
5004         nr = kvm_register_read(vcpu, VCPU_REGS_RAX);
5005         a0 = kvm_register_read(vcpu, VCPU_REGS_RBX);
5006         a1 = kvm_register_read(vcpu, VCPU_REGS_RCX);
5007         a2 = kvm_register_read(vcpu, VCPU_REGS_RDX);
5008         a3 = kvm_register_read(vcpu, VCPU_REGS_RSI);
5009
5010         trace_kvm_hypercall(nr, a0, a1, a2, a3);
5011
5012         if (!is_long_mode(vcpu)) {
5013                 nr &= 0xFFFFFFFF;
5014                 a0 &= 0xFFFFFFFF;
5015                 a1 &= 0xFFFFFFFF;
5016                 a2 &= 0xFFFFFFFF;
5017                 a3 &= 0xFFFFFFFF;
5018         }
5019
5020         if (kvm_x86_ops->get_cpl(vcpu) != 0) {
5021                 ret = -KVM_EPERM;
5022                 goto out;
5023         }
5024
5025         switch (nr) {
5026         case KVM_HC_VAPIC_POLL_IRQ:
5027                 ret = 0;
5028                 break;
5029         default:
5030                 ret = -KVM_ENOSYS;
5031                 break;
5032         }
5033 out:
5034         kvm_register_write(vcpu, VCPU_REGS_RAX, ret);
5035         ++vcpu->stat.hypercalls;
5036         return r;
5037 }
5038 EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);
5039
5040 int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt)
5041 {
5042         struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
5043         char instruction[3];
5044         unsigned long rip = kvm_rip_read(vcpu);
5045
5046         /*
5047          * Blow out the MMU to ensure that no other VCPU has an active mapping
5048          * to ensure that the updated hypercall appears atomically across all
5049          * VCPUs.
5050          */
5051         kvm_mmu_zap_all(vcpu->kvm);
5052
5053         kvm_x86_ops->patch_hypercall(vcpu, instruction);
5054
5055         return emulator_write_emulated(ctxt, rip, instruction, 3, NULL);
5056 }
5057
5058 /*
5059  * Check if userspace requested an interrupt window, and that the
5060  * interrupt window is open.
5061  *
5062  * No need to exit to userspace if we already have an interrupt queued.
5063  */
5064 static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu)
5065 {
5066         return (!irqchip_in_kernel(vcpu->kvm) && !kvm_cpu_has_interrupt(vcpu) &&
5067                 vcpu->run->request_interrupt_window &&
5068                 kvm_arch_interrupt_allowed(vcpu));
5069 }
5070
5071 static void post_kvm_run_save(struct kvm_vcpu *vcpu)
5072 {
5073         struct kvm_run *kvm_run = vcpu->run;
5074
5075         kvm_run->if_flag = (kvm_get_rflags(vcpu) & X86_EFLAGS_IF) != 0;
5076         kvm_run->cr8 = kvm_get_cr8(vcpu);
5077         kvm_run->apic_base = kvm_get_apic_base(vcpu);
5078         if (irqchip_in_kernel(vcpu->kvm))
5079                 kvm_run->ready_for_interrupt_injection = 1;
5080         else
5081                 kvm_run->ready_for_interrupt_injection =
5082                         kvm_arch_interrupt_allowed(vcpu) &&
5083                         !kvm_cpu_has_interrupt(vcpu) &&
5084                         !kvm_event_needs_reinjection(vcpu);
5085 }
5086
5087 static void vapic_enter(struct kvm_vcpu *vcpu)
5088 {
5089         struct kvm_lapic *apic = vcpu->arch.apic;
5090         struct page *page;
5091
5092         if (!apic || !apic->vapic_addr)
5093                 return;
5094
5095         page = gfn_to_page(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
5096
5097         vcpu->arch.apic->vapic_page = page;
5098 }
5099
5100 static void vapic_exit(struct kvm_vcpu *vcpu)
5101 {
5102         struct kvm_lapic *apic = vcpu->arch.apic;
5103         int idx;
5104
5105         if (!apic || !apic->vapic_addr)
5106                 return;
5107
5108         idx = srcu_read_lock(&vcpu->kvm->srcu);
5109         kvm_release_page_dirty(apic->vapic_page);
5110         mark_page_dirty(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
5111         srcu_read_unlock(&vcpu->kvm->srcu, idx);
5112 }
5113
5114 static void update_cr8_intercept(struct kvm_vcpu *vcpu)
5115 {
5116         int max_irr, tpr;
5117
5118         if (!kvm_x86_ops->update_cr8_intercept)
5119                 return;
5120
5121         if (!vcpu->arch.apic)
5122                 return;
5123
5124         if (!vcpu->arch.apic->vapic_addr)
5125                 max_irr = kvm_lapic_find_highest_irr(vcpu);
5126         else
5127                 max_irr = -1;
5128
5129         if (max_irr != -1)
5130                 max_irr >>= 4;
5131
5132         tpr = kvm_lapic_get_cr8(vcpu);
5133
5134         kvm_x86_ops->update_cr8_intercept(vcpu, tpr, max_irr);
5135 }
5136
5137 static void inject_pending_event(struct kvm_vcpu *vcpu)
5138 {
5139         /* try to reinject previous events if any */
5140         if (vcpu->arch.exception.pending) {
5141                 trace_kvm_inj_exception(vcpu->arch.exception.nr,
5142                                         vcpu->arch.exception.has_error_code,
5143                                         vcpu->arch.exception.error_code);
5144                 kvm_x86_ops->queue_exception(vcpu, vcpu->arch.exception.nr,
5145                                           vcpu->arch.exception.has_error_code,
5146                                           vcpu->arch.exception.error_code,
5147                                           vcpu->arch.exception.reinject);
5148                 return;
5149         }
5150
5151         if (vcpu->arch.nmi_injected) {
5152                 kvm_x86_ops->set_nmi(vcpu);
5153                 return;
5154         }
5155
5156         if (vcpu->arch.interrupt.pending) {
5157                 kvm_x86_ops->set_irq(vcpu);
5158                 return;
5159         }
5160
5161         /* try to inject new event if pending */
5162         if (vcpu->arch.nmi_pending) {
5163                 if (kvm_x86_ops->nmi_allowed(vcpu)) {
5164                         --vcpu->arch.nmi_pending;
5165                         vcpu->arch.nmi_injected = true;
5166                         kvm_x86_ops->set_nmi(vcpu);
5167                 }
5168         } else if (kvm_cpu_has_interrupt(vcpu)) {
5169                 if (kvm_x86_ops->interrupt_allowed(vcpu)) {
5170                         kvm_queue_interrupt(vcpu, kvm_cpu_get_interrupt(vcpu),
5171                                             false);
5172                         kvm_x86_ops->set_irq(vcpu);
5173                 }
5174         }
5175 }
5176
5177 static void kvm_load_guest_xcr0(struct kvm_vcpu *vcpu)
5178 {
5179         if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE) &&
5180                         !vcpu->guest_xcr0_loaded) {
5181                 /* kvm_set_xcr() also depends on this */
5182                 xsetbv(XCR_XFEATURE_ENABLED_MASK, vcpu->arch.xcr0);
5183                 vcpu->guest_xcr0_loaded = 1;
5184         }
5185 }
5186
5187 static void kvm_put_guest_xcr0(struct kvm_vcpu *vcpu)
5188 {
5189         if (vcpu->guest_xcr0_loaded) {
5190                 if (vcpu->arch.xcr0 != host_xcr0)
5191                         xsetbv(XCR_XFEATURE_ENABLED_MASK, host_xcr0);
5192                 vcpu->guest_xcr0_loaded = 0;
5193         }
5194 }
5195
5196 static void process_nmi(struct kvm_vcpu *vcpu)
5197 {
5198         unsigned limit = 2;
5199
5200         /*
5201          * x86 is limited to one NMI running, and one NMI pending after it.
5202          * If an NMI is already in progress, limit further NMIs to just one.
5203          * Otherwise, allow two (and we'll inject the first one immediately).
5204          */
5205         if (kvm_x86_ops->get_nmi_mask(vcpu) || vcpu->arch.nmi_injected)
5206                 limit = 1;
5207
5208         vcpu->arch.nmi_pending += atomic_xchg(&vcpu->arch.nmi_queued, 0);
5209         vcpu->arch.nmi_pending = min(vcpu->arch.nmi_pending, limit);
5210         kvm_make_request(KVM_REQ_EVENT, vcpu);
5211 }
5212
5213 static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
5214 {
5215         int r;
5216         bool req_int_win = !irqchip_in_kernel(vcpu->kvm) &&
5217                 vcpu->run->request_interrupt_window;
5218         bool req_immediate_exit = 0;
5219
5220         if (vcpu->requests) {
5221                 if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu))
5222                         kvm_mmu_unload(vcpu);
5223                 if (kvm_check_request(KVM_REQ_MIGRATE_TIMER, vcpu))
5224                         __kvm_migrate_timers(vcpu);
5225                 if (kvm_check_request(KVM_REQ_CLOCK_UPDATE, vcpu)) {
5226                         r = kvm_guest_time_update(vcpu);
5227                         if (unlikely(r))
5228                                 goto out;
5229                 }
5230                 if (kvm_check_request(KVM_REQ_MMU_SYNC, vcpu))
5231                         kvm_mmu_sync_roots(vcpu);
5232                 if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu))
5233                         kvm_x86_ops->tlb_flush(vcpu);
5234                 if (kvm_check_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu)) {
5235                         vcpu->run->exit_reason = KVM_EXIT_TPR_ACCESS;
5236                         r = 0;
5237                         goto out;
5238                 }
5239                 if (kvm_check_request(KVM_REQ_TRIPLE_FAULT, vcpu)) {
5240                         vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN;
5241                         r = 0;
5242                         goto out;
5243                 }
5244                 if (kvm_check_request(KVM_REQ_DEACTIVATE_FPU, vcpu)) {
5245                         vcpu->fpu_active = 0;
5246                         kvm_x86_ops->fpu_deactivate(vcpu);
5247                 }
5248                 if (kvm_check_request(KVM_REQ_APF_HALT, vcpu)) {
5249                         /* Page is swapped out. Do synthetic halt */
5250                         vcpu->arch.apf.halted = true;
5251                         r = 1;
5252                         goto out;
5253                 }
5254                 if (kvm_check_request(KVM_REQ_STEAL_UPDATE, vcpu))
5255                         record_steal_time(vcpu);
5256                 if (kvm_check_request(KVM_REQ_NMI, vcpu))
5257                         process_nmi(vcpu);
5258                 req_immediate_exit =
5259                         kvm_check_request(KVM_REQ_IMMEDIATE_EXIT, vcpu);
5260                 if (kvm_check_request(KVM_REQ_PMU, vcpu))
5261                         kvm_handle_pmu_event(vcpu);
5262                 if (kvm_check_request(KVM_REQ_PMI, vcpu))
5263                         kvm_deliver_pmi(vcpu);
5264         }
5265
5266         r = kvm_mmu_reload(vcpu);
5267         if (unlikely(r))
5268                 goto out;
5269
5270         if (kvm_check_request(KVM_REQ_EVENT, vcpu) || req_int_win) {
5271                 inject_pending_event(vcpu);
5272
5273                 /* enable NMI/IRQ window open exits if needed */
5274                 if (vcpu->arch.nmi_pending)
5275                         kvm_x86_ops->enable_nmi_window(vcpu);
5276                 else if (kvm_cpu_has_interrupt(vcpu) || req_int_win)
5277                         kvm_x86_ops->enable_irq_window(vcpu);
5278
5279                 if (kvm_lapic_enabled(vcpu)) {
5280                         update_cr8_intercept(vcpu);
5281                         kvm_lapic_sync_to_vapic(vcpu);
5282                 }
5283         }
5284
5285         preempt_disable();
5286
5287         kvm_x86_ops->prepare_guest_switch(vcpu);
5288         if (vcpu->fpu_active)
5289                 kvm_load_guest_fpu(vcpu);
5290         kvm_load_guest_xcr0(vcpu);
5291
5292         vcpu->mode = IN_GUEST_MODE;
5293
5294         /* We should set ->mode before check ->requests,
5295          * see the comment in make_all_cpus_request.
5296          */
5297         smp_mb();
5298
5299         local_irq_disable();
5300
5301         if (vcpu->mode == EXITING_GUEST_MODE || vcpu->requests
5302             || need_resched() || signal_pending(current)) {
5303                 vcpu->mode = OUTSIDE_GUEST_MODE;
5304                 smp_wmb();
5305                 local_irq_enable();
5306                 preempt_enable();
5307                 kvm_x86_ops->cancel_injection(vcpu);
5308                 r = 1;
5309                 goto out;
5310         }
5311
5312         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
5313
5314         if (req_immediate_exit)
5315                 smp_send_reschedule(vcpu->cpu);
5316
5317         kvm_guest_enter();
5318
5319         if (unlikely(vcpu->arch.switch_db_regs)) {
5320                 set_debugreg(0, 7);
5321                 set_debugreg(vcpu->arch.eff_db[0], 0);
5322                 set_debugreg(vcpu->arch.eff_db[1], 1);
5323                 set_debugreg(vcpu->arch.eff_db[2], 2);
5324                 set_debugreg(vcpu->arch.eff_db[3], 3);
5325         }
5326
5327         trace_kvm_entry(vcpu->vcpu_id);
5328         kvm_x86_ops->run(vcpu);
5329
5330         /*
5331          * If the guest has used debug registers, at least dr7
5332          * will be disabled while returning to the host.
5333          * If we don't have active breakpoints in the host, we don't
5334          * care about the messed up debug address registers. But if
5335          * we have some of them active, restore the old state.
5336          */
5337         if (hw_breakpoint_active())
5338                 hw_breakpoint_restore();
5339
5340         vcpu->arch.last_guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu);
5341
5342         vcpu->mode = OUTSIDE_GUEST_MODE;
5343         smp_wmb();
5344         local_irq_enable();
5345
5346         ++vcpu->stat.exits;
5347
5348         /*
5349          * We must have an instruction between local_irq_enable() and
5350          * kvm_guest_exit(), so the timer interrupt isn't delayed by
5351          * the interrupt shadow.  The stat.exits increment will do nicely.
5352          * But we need to prevent reordering, hence this barrier():
5353          */
5354         barrier();
5355
5356         kvm_guest_exit();
5357
5358         preempt_enable();
5359
5360         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
5361
5362         /*
5363          * Profile KVM exit RIPs:
5364          */
5365         if (unlikely(prof_on == KVM_PROFILING)) {
5366                 unsigned long rip = kvm_rip_read(vcpu);
5367                 profile_hit(KVM_PROFILING, (void *)rip);
5368         }
5369
5370         if (unlikely(vcpu->arch.tsc_always_catchup))
5371                 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
5372
5373         kvm_lapic_sync_from_vapic(vcpu);
5374
5375         r = kvm_x86_ops->handle_exit(vcpu);
5376 out:
5377         return r;
5378 }
5379
5380
5381 static int __vcpu_run(struct kvm_vcpu *vcpu)
5382 {
5383         int r;
5384         struct kvm *kvm = vcpu->kvm;
5385
5386         if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED)) {
5387                 pr_debug("vcpu %d received sipi with vector # %x\n",
5388                          vcpu->vcpu_id, vcpu->arch.sipi_vector);
5389                 kvm_lapic_reset(vcpu);
5390                 r = kvm_arch_vcpu_reset(vcpu);
5391                 if (r)
5392                         return r;
5393                 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
5394         }
5395
5396         vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
5397         vapic_enter(vcpu);
5398
5399         r = 1;
5400         while (r > 0) {
5401                 if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE &&
5402                     !vcpu->arch.apf.halted)
5403                         r = vcpu_enter_guest(vcpu);
5404                 else {
5405                         srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
5406                         kvm_vcpu_block(vcpu);
5407                         vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
5408                         if (kvm_check_request(KVM_REQ_UNHALT, vcpu))
5409                         {
5410                                 switch(vcpu->arch.mp_state) {
5411                                 case KVM_MP_STATE_HALTED:
5412                                         vcpu->arch.mp_state =
5413                                                 KVM_MP_STATE_RUNNABLE;
5414                                 case KVM_MP_STATE_RUNNABLE:
5415                                         vcpu->arch.apf.halted = false;
5416                                         break;
5417                                 case KVM_MP_STATE_SIPI_RECEIVED:
5418                                 default:
5419                                         r = -EINTR;
5420                                         break;
5421                                 }
5422                         }
5423                 }
5424
5425                 if (r <= 0)
5426                         break;
5427
5428                 clear_bit(KVM_REQ_PENDING_TIMER, &vcpu->requests);
5429                 if (kvm_cpu_has_pending_timer(vcpu))
5430                         kvm_inject_pending_timer_irqs(vcpu);
5431
5432                 if (dm_request_for_irq_injection(vcpu)) {
5433                         r = -EINTR;
5434                         vcpu->run->exit_reason = KVM_EXIT_INTR;
5435                         ++vcpu->stat.request_irq_exits;
5436                 }
5437
5438                 kvm_check_async_pf_completion(vcpu);
5439
5440                 if (signal_pending(current)) {
5441                         r = -EINTR;
5442                         vcpu->run->exit_reason = KVM_EXIT_INTR;
5443                         ++vcpu->stat.signal_exits;
5444                 }
5445                 if (need_resched()) {
5446                         srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
5447                         kvm_resched(vcpu);
5448                         vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
5449                 }
5450         }
5451
5452         srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
5453
5454         vapic_exit(vcpu);
5455
5456         return r;
5457 }
5458
5459 static int complete_mmio(struct kvm_vcpu *vcpu)
5460 {
5461         struct kvm_run *run = vcpu->run;
5462         int r;
5463
5464         if (!(vcpu->arch.pio.count || vcpu->mmio_needed))
5465                 return 1;
5466
5467         if (vcpu->mmio_needed) {
5468                 vcpu->mmio_needed = 0;
5469                 if (!vcpu->mmio_is_write)
5470                         memcpy(vcpu->mmio_data + vcpu->mmio_index,
5471                                run->mmio.data, 8);
5472                 vcpu->mmio_index += 8;
5473                 if (vcpu->mmio_index < vcpu->mmio_size) {
5474                         run->exit_reason = KVM_EXIT_MMIO;
5475                         run->mmio.phys_addr = vcpu->mmio_phys_addr + vcpu->mmio_index;
5476                         memcpy(run->mmio.data, vcpu->mmio_data + vcpu->mmio_index, 8);
5477                         run->mmio.len = min(vcpu->mmio_size - vcpu->mmio_index, 8);
5478                         run->mmio.is_write = vcpu->mmio_is_write;
5479                         vcpu->mmio_needed = 1;
5480                         return 0;
5481                 }
5482                 if (vcpu->mmio_is_write)
5483                         return 1;
5484                 vcpu->mmio_read_completed = 1;
5485         }
5486         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
5487         r = emulate_instruction(vcpu, EMULTYPE_NO_DECODE);
5488         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
5489         if (r != EMULATE_DONE)
5490                 return 0;
5491         return 1;
5492 }
5493
5494 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
5495 {
5496         int r;
5497         sigset_t sigsaved;
5498
5499         if (!tsk_used_math(current) && init_fpu(current))
5500                 return -ENOMEM;
5501
5502         if (vcpu->sigset_active)
5503                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
5504
5505         if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) {
5506                 kvm_vcpu_block(vcpu);
5507                 clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
5508                 r = -EAGAIN;
5509                 goto out;
5510         }
5511
5512         /* re-sync apic's tpr */
5513         if (!irqchip_in_kernel(vcpu->kvm)) {
5514                 if (kvm_set_cr8(vcpu, kvm_run->cr8) != 0) {
5515                         r = -EINVAL;
5516                         goto out;
5517                 }
5518         }
5519
5520         r = complete_mmio(vcpu);
5521         if (r <= 0)
5522                 goto out;
5523
5524         r = __vcpu_run(vcpu);
5525
5526 out:
5527         post_kvm_run_save(vcpu);
5528         if (vcpu->sigset_active)
5529                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
5530
5531         return r;
5532 }
5533
5534 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
5535 {
5536         if (vcpu->arch.emulate_regs_need_sync_to_vcpu) {
5537                 /*
5538                  * We are here if userspace calls get_regs() in the middle of
5539                  * instruction emulation. Registers state needs to be copied
5540                  * back from emulation context to vcpu. Usrapace shouldn't do
5541                  * that usually, but some bad designed PV devices (vmware
5542                  * backdoor interface) need this to work
5543                  */
5544                 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
5545                 memcpy(vcpu->arch.regs, ctxt->regs, sizeof ctxt->regs);
5546                 vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
5547         }
5548         regs->rax = kvm_register_read(vcpu, VCPU_REGS_RAX);
5549         regs->rbx = kvm_register_read(vcpu, VCPU_REGS_RBX);
5550         regs->rcx = kvm_register_read(vcpu, VCPU_REGS_RCX);
5551         regs->rdx = kvm_register_read(vcpu, VCPU_REGS_RDX);
5552         regs->rsi = kvm_register_read(vcpu, VCPU_REGS_RSI);
5553         regs->rdi = kvm_register_read(vcpu, VCPU_REGS_RDI);
5554         regs->rsp = kvm_register_read(vcpu, VCPU_REGS_RSP);
5555         regs->rbp = kvm_register_read(vcpu, VCPU_REGS_RBP);
5556 #ifdef CONFIG_X86_64
5557         regs->r8 = kvm_register_read(vcpu, VCPU_REGS_R8);
5558         regs->r9 = kvm_register_read(vcpu, VCPU_REGS_R9);
5559         regs->r10 = kvm_register_read(vcpu, VCPU_REGS_R10);
5560         regs->r11 = kvm_register_read(vcpu, VCPU_REGS_R11);
5561         regs->r12 = kvm_register_read(vcpu, VCPU_REGS_R12);
5562         regs->r13 = kvm_register_read(vcpu, VCPU_REGS_R13);
5563         regs->r14 = kvm_register_read(vcpu, VCPU_REGS_R14);
5564         regs->r15 = kvm_register_read(vcpu, VCPU_REGS_R15);
5565 #endif
5566
5567         regs->rip = kvm_rip_read(vcpu);
5568         regs->rflags = kvm_get_rflags(vcpu);
5569
5570         return 0;
5571 }
5572
5573 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
5574 {
5575         vcpu->arch.emulate_regs_need_sync_from_vcpu = true;
5576         vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
5577
5578         kvm_register_write(vcpu, VCPU_REGS_RAX, regs->rax);
5579         kvm_register_write(vcpu, VCPU_REGS_RBX, regs->rbx);
5580         kvm_register_write(vcpu, VCPU_REGS_RCX, regs->rcx);
5581         kvm_register_write(vcpu, VCPU_REGS_RDX, regs->rdx);
5582         kvm_register_write(vcpu, VCPU_REGS_RSI, regs->rsi);
5583         kvm_register_write(vcpu, VCPU_REGS_RDI, regs->rdi);
5584         kvm_register_write(vcpu, VCPU_REGS_RSP, regs->rsp);
5585         kvm_register_write(vcpu, VCPU_REGS_RBP, regs->rbp);
5586 #ifdef CONFIG_X86_64
5587         kvm_register_write(vcpu, VCPU_REGS_R8, regs->r8);
5588         kvm_register_write(vcpu, VCPU_REGS_R9, regs->r9);
5589         kvm_register_write(vcpu, VCPU_REGS_R10, regs->r10);
5590         kvm_register_write(vcpu, VCPU_REGS_R11, regs->r11);
5591         kvm_register_write(vcpu, VCPU_REGS_R12, regs->r12);
5592         kvm_register_write(vcpu, VCPU_REGS_R13, regs->r13);
5593         kvm_register_write(vcpu, VCPU_REGS_R14, regs->r14);
5594         kvm_register_write(vcpu, VCPU_REGS_R15, regs->r15);
5595 #endif
5596
5597         kvm_rip_write(vcpu, regs->rip);
5598         kvm_set_rflags(vcpu, regs->rflags);
5599
5600         vcpu->arch.exception.pending = false;
5601
5602         kvm_make_request(KVM_REQ_EVENT, vcpu);
5603
5604         return 0;
5605 }
5606
5607 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
5608 {
5609         struct kvm_segment cs;
5610
5611         kvm_get_segment(vcpu, &cs, VCPU_SREG_CS);
5612         *db = cs.db;
5613         *l = cs.l;
5614 }
5615 EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);
5616
5617 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
5618                                   struct kvm_sregs *sregs)
5619 {
5620         struct desc_ptr dt;
5621
5622         kvm_get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
5623         kvm_get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
5624         kvm_get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
5625         kvm_get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
5626         kvm_get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
5627         kvm_get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
5628
5629         kvm_get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
5630         kvm_get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
5631
5632         kvm_x86_ops->get_idt(vcpu, &dt);
5633         sregs->idt.limit = dt.size;
5634         sregs->idt.base = dt.address;
5635         kvm_x86_ops->get_gdt(vcpu, &dt);
5636         sregs->gdt.limit = dt.size;
5637         sregs->gdt.base = dt.address;
5638
5639         sregs->cr0 = kvm_read_cr0(vcpu);
5640         sregs->cr2 = vcpu->arch.cr2;
5641         sregs->cr3 = kvm_read_cr3(vcpu);
5642         sregs->cr4 = kvm_read_cr4(vcpu);
5643         sregs->cr8 = kvm_get_cr8(vcpu);
5644         sregs->efer = vcpu->arch.efer;
5645         sregs->apic_base = kvm_get_apic_base(vcpu);
5646
5647         memset(sregs->interrupt_bitmap, 0, sizeof sregs->interrupt_bitmap);
5648
5649         if (vcpu->arch.interrupt.pending && !vcpu->arch.interrupt.soft)
5650                 set_bit(vcpu->arch.interrupt.nr,
5651                         (unsigned long *)sregs->interrupt_bitmap);
5652
5653         return 0;
5654 }
5655
5656 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
5657                                     struct kvm_mp_state *mp_state)
5658 {
5659         mp_state->mp_state = vcpu->arch.mp_state;
5660         return 0;
5661 }
5662
5663 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
5664                                     struct kvm_mp_state *mp_state)
5665 {
5666         vcpu->arch.mp_state = mp_state->mp_state;
5667         kvm_make_request(KVM_REQ_EVENT, vcpu);
5668         return 0;
5669 }
5670
5671 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int idt_index,
5672                     int reason, bool has_error_code, u32 error_code)
5673 {
5674         struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
5675         int ret;
5676
5677         init_emulate_ctxt(vcpu);
5678
5679         ret = emulator_task_switch(ctxt, tss_selector, idt_index, reason,
5680                                    has_error_code, error_code);
5681
5682         if (ret)
5683                 return EMULATE_FAIL;
5684
5685         memcpy(vcpu->arch.regs, ctxt->regs, sizeof ctxt->regs);
5686         kvm_rip_write(vcpu, ctxt->eip);
5687         kvm_set_rflags(vcpu, ctxt->eflags);
5688         kvm_make_request(KVM_REQ_EVENT, vcpu);
5689         return EMULATE_DONE;
5690 }
5691 EXPORT_SYMBOL_GPL(kvm_task_switch);
5692
5693 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
5694                                   struct kvm_sregs *sregs)
5695 {
5696         int mmu_reset_needed = 0;
5697         int pending_vec, max_bits, idx;
5698         struct desc_ptr dt;
5699
5700         dt.size = sregs->idt.limit;
5701         dt.address = sregs->idt.base;
5702         kvm_x86_ops->set_idt(vcpu, &dt);
5703         dt.size = sregs->gdt.limit;
5704         dt.address = sregs->gdt.base;
5705         kvm_x86_ops->set_gdt(vcpu, &dt);
5706
5707         vcpu->arch.cr2 = sregs->cr2;
5708         mmu_reset_needed |= kvm_read_cr3(vcpu) != sregs->cr3;
5709         vcpu->arch.cr3 = sregs->cr3;
5710         __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail);
5711
5712         kvm_set_cr8(vcpu, sregs->cr8);
5713
5714         mmu_reset_needed |= vcpu->arch.efer != sregs->efer;
5715         kvm_x86_ops->set_efer(vcpu, sregs->efer);
5716         kvm_set_apic_base(vcpu, sregs->apic_base);
5717
5718         mmu_reset_needed |= kvm_read_cr0(vcpu) != sregs->cr0;
5719         kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
5720         vcpu->arch.cr0 = sregs->cr0;
5721
5722         mmu_reset_needed |= kvm_read_cr4(vcpu) != sregs->cr4;
5723         kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
5724         if (sregs->cr4 & X86_CR4_OSXSAVE)
5725                 kvm_update_cpuid(vcpu);
5726
5727         idx = srcu_read_lock(&vcpu->kvm->srcu);
5728         if (!is_long_mode(vcpu) && is_pae(vcpu)) {
5729                 load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu));
5730                 mmu_reset_needed = 1;
5731         }
5732         srcu_read_unlock(&vcpu->kvm->srcu, idx);
5733
5734         if (mmu_reset_needed)
5735                 kvm_mmu_reset_context(vcpu);
5736
5737         max_bits = (sizeof sregs->interrupt_bitmap) << 3;
5738         pending_vec = find_first_bit(
5739                 (const unsigned long *)sregs->interrupt_bitmap, max_bits);
5740         if (pending_vec < max_bits) {
5741                 kvm_queue_interrupt(vcpu, pending_vec, false);
5742                 pr_debug("Set back pending irq %d\n", pending_vec);
5743         }
5744
5745         kvm_set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
5746         kvm_set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
5747         kvm_set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
5748         kvm_set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
5749         kvm_set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
5750         kvm_set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
5751
5752         kvm_set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
5753         kvm_set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
5754
5755         update_cr8_intercept(vcpu);
5756
5757         /* Older userspace won't unhalt the vcpu on reset. */
5758         if (kvm_vcpu_is_bsp(vcpu) && kvm_rip_read(vcpu) == 0xfff0 &&
5759             sregs->cs.selector == 0xf000 && sregs->cs.base == 0xffff0000 &&
5760             !is_protmode(vcpu))
5761                 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
5762
5763         kvm_make_request(KVM_REQ_EVENT, vcpu);
5764
5765         return 0;
5766 }
5767
5768 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
5769                                         struct kvm_guest_debug *dbg)
5770 {
5771         unsigned long rflags;
5772         int i, r;
5773
5774         if (dbg->control & (KVM_GUESTDBG_INJECT_DB | KVM_GUESTDBG_INJECT_BP)) {
5775                 r = -EBUSY;
5776                 if (vcpu->arch.exception.pending)
5777                         goto out;
5778                 if (dbg->control & KVM_GUESTDBG_INJECT_DB)
5779                         kvm_queue_exception(vcpu, DB_VECTOR);
5780                 else
5781                         kvm_queue_exception(vcpu, BP_VECTOR);
5782         }
5783
5784         /*
5785          * Read rflags as long as potentially injected trace flags are still
5786          * filtered out.
5787          */
5788         rflags = kvm_get_rflags(vcpu);
5789
5790         vcpu->guest_debug = dbg->control;
5791         if (!(vcpu->guest_debug & KVM_GUESTDBG_ENABLE))
5792                 vcpu->guest_debug = 0;
5793
5794         if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) {
5795                 for (i = 0; i < KVM_NR_DB_REGS; ++i)
5796                         vcpu->arch.eff_db[i] = dbg->arch.debugreg[i];
5797                 vcpu->arch.switch_db_regs =
5798                         (dbg->arch.debugreg[7] & DR7_BP_EN_MASK);
5799         } else {
5800                 for (i = 0; i < KVM_NR_DB_REGS; i++)
5801                         vcpu->arch.eff_db[i] = vcpu->arch.db[i];
5802                 vcpu->arch.switch_db_regs = (vcpu->arch.dr7 & DR7_BP_EN_MASK);
5803         }
5804
5805         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
5806                 vcpu->arch.singlestep_rip = kvm_rip_read(vcpu) +
5807                         get_segment_base(vcpu, VCPU_SREG_CS);
5808
5809         /*
5810          * Trigger an rflags update that will inject or remove the trace
5811          * flags.
5812          */
5813         kvm_set_rflags(vcpu, rflags);
5814
5815         kvm_x86_ops->set_guest_debug(vcpu, dbg);
5816
5817         r = 0;
5818
5819 out:
5820
5821         return r;
5822 }
5823
5824 /*
5825  * Translate a guest virtual address to a guest physical address.
5826  */
5827 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
5828                                     struct kvm_translation *tr)
5829 {
5830         unsigned long vaddr = tr->linear_address;
5831         gpa_t gpa;
5832         int idx;
5833
5834         idx = srcu_read_lock(&vcpu->kvm->srcu);
5835         gpa = kvm_mmu_gva_to_gpa_system(vcpu, vaddr, NULL);
5836         srcu_read_unlock(&vcpu->kvm->srcu, idx);
5837         tr->physical_address = gpa;
5838         tr->valid = gpa != UNMAPPED_GVA;
5839         tr->writeable = 1;
5840         tr->usermode = 0;
5841
5842         return 0;
5843 }
5844
5845 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
5846 {
5847         struct i387_fxsave_struct *fxsave =
5848                         &vcpu->arch.guest_fpu.state->fxsave;
5849
5850         memcpy(fpu->fpr, fxsave->st_space, 128);
5851         fpu->fcw = fxsave->cwd;
5852         fpu->fsw = fxsave->swd;
5853         fpu->ftwx = fxsave->twd;
5854         fpu->last_opcode = fxsave->fop;
5855         fpu->last_ip = fxsave->rip;
5856         fpu->last_dp = fxsave->rdp;
5857         memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
5858
5859         return 0;
5860 }
5861
5862 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
5863 {
5864         struct i387_fxsave_struct *fxsave =
5865                         &vcpu->arch.guest_fpu.state->fxsave;
5866
5867         memcpy(fxsave->st_space, fpu->fpr, 128);
5868         fxsave->cwd = fpu->fcw;
5869         fxsave->swd = fpu->fsw;
5870         fxsave->twd = fpu->ftwx;
5871         fxsave->fop = fpu->last_opcode;
5872         fxsave->rip = fpu->last_ip;
5873         fxsave->rdp = fpu->last_dp;
5874         memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
5875
5876         return 0;
5877 }
5878
5879 int fx_init(struct kvm_vcpu *vcpu)
5880 {
5881         int err;
5882
5883         err = fpu_alloc(&vcpu->arch.guest_fpu);
5884         if (err)
5885                 return err;
5886
5887         fpu_finit(&vcpu->arch.guest_fpu);
5888
5889         /*
5890          * Ensure guest xcr0 is valid for loading
5891          */
5892         vcpu->arch.xcr0 = XSTATE_FP;
5893
5894         vcpu->arch.cr0 |= X86_CR0_ET;
5895
5896         return 0;
5897 }
5898 EXPORT_SYMBOL_GPL(fx_init);
5899
5900 static void fx_free(struct kvm_vcpu *vcpu)
5901 {
5902         fpu_free(&vcpu->arch.guest_fpu);
5903 }
5904
5905 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
5906 {
5907         if (vcpu->guest_fpu_loaded)
5908                 return;
5909
5910         /*
5911          * Restore all possible states in the guest,
5912          * and assume host would use all available bits.
5913          * Guest xcr0 would be loaded later.
5914          */
5915         kvm_put_guest_xcr0(vcpu);
5916         vcpu->guest_fpu_loaded = 1;
5917         unlazy_fpu(current);
5918         fpu_restore_checking(&vcpu->arch.guest_fpu);
5919         trace_kvm_fpu(1);
5920 }
5921
5922 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
5923 {
5924         kvm_put_guest_xcr0(vcpu);
5925
5926         if (!vcpu->guest_fpu_loaded)
5927                 return;
5928
5929         vcpu->guest_fpu_loaded = 0;
5930         fpu_save_init(&vcpu->arch.guest_fpu);
5931         ++vcpu->stat.fpu_reload;
5932         kvm_make_request(KVM_REQ_DEACTIVATE_FPU, vcpu);
5933         trace_kvm_fpu(0);
5934 }
5935
5936 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
5937 {
5938         kvmclock_reset(vcpu);
5939
5940         free_cpumask_var(vcpu->arch.wbinvd_dirty_mask);
5941         fx_free(vcpu);
5942         kvm_x86_ops->vcpu_free(vcpu);
5943 }
5944
5945 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
5946                                                 unsigned int id)
5947 {
5948         if (check_tsc_unstable() && atomic_read(&kvm->online_vcpus) != 0)
5949                 printk_once(KERN_WARNING
5950                 "kvm: SMP vm created on host with unstable TSC; "
5951                 "guest TSC will not be reliable\n");
5952         return kvm_x86_ops->vcpu_create(kvm, id);
5953 }
5954
5955 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
5956 {
5957         int r;
5958
5959         vcpu->arch.mtrr_state.have_fixed = 1;
5960         vcpu_load(vcpu);
5961         r = kvm_arch_vcpu_reset(vcpu);
5962         if (r == 0)
5963                 r = kvm_mmu_setup(vcpu);
5964         vcpu_put(vcpu);
5965
5966         return r;
5967 }
5968
5969 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
5970 {
5971         vcpu->arch.apf.msr_val = 0;
5972
5973         vcpu_load(vcpu);
5974         kvm_mmu_unload(vcpu);
5975         vcpu_put(vcpu);
5976
5977         fx_free(vcpu);
5978         kvm_x86_ops->vcpu_free(vcpu);
5979 }
5980
5981 int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu)
5982 {
5983         atomic_set(&vcpu->arch.nmi_queued, 0);
5984         vcpu->arch.nmi_pending = 0;
5985         vcpu->arch.nmi_injected = false;
5986
5987         vcpu->arch.switch_db_regs = 0;
5988         memset(vcpu->arch.db, 0, sizeof(vcpu->arch.db));
5989         vcpu->arch.dr6 = DR6_FIXED_1;
5990         vcpu->arch.dr7 = DR7_FIXED_1;
5991
5992         kvm_make_request(KVM_REQ_EVENT, vcpu);
5993         vcpu->arch.apf.msr_val = 0;
5994         vcpu->arch.st.msr_val = 0;
5995
5996         kvmclock_reset(vcpu);
5997
5998         kvm_clear_async_pf_completion_queue(vcpu);
5999         kvm_async_pf_hash_reset(vcpu);
6000         vcpu->arch.apf.halted = false;
6001
6002         kvm_pmu_reset(vcpu);
6003
6004         return kvm_x86_ops->vcpu_reset(vcpu);
6005 }
6006
6007 int kvm_arch_hardware_enable(void *garbage)
6008 {
6009         struct kvm *kvm;
6010         struct kvm_vcpu *vcpu;
6011         int i;
6012         int ret;
6013         u64 local_tsc;
6014         u64 max_tsc = 0;
6015         bool stable, backwards_tsc = false;
6016
6017         kvm_shared_msr_cpu_online();
6018         ret = kvm_x86_ops->hardware_enable(garbage);
6019         if (ret != 0)
6020                 return ret;
6021
6022         local_tsc = native_read_tsc();
6023         stable = !check_tsc_unstable();
6024         list_for_each_entry(kvm, &vm_list, vm_list) {
6025                 kvm_for_each_vcpu(i, vcpu, kvm) {
6026                         if (!stable && vcpu->cpu == smp_processor_id())
6027                                 set_bit(KVM_REQ_CLOCK_UPDATE, &vcpu->requests);
6028                         if (stable && vcpu->arch.last_host_tsc > local_tsc) {
6029                                 backwards_tsc = true;
6030                                 if (vcpu->arch.last_host_tsc > max_tsc)
6031                                         max_tsc = vcpu->arch.last_host_tsc;
6032                         }
6033                 }
6034         }
6035
6036         /*
6037          * Sometimes, even reliable TSCs go backwards.  This happens on
6038          * platforms that reset TSC during suspend or hibernate actions, but
6039          * maintain synchronization.  We must compensate.  Fortunately, we can
6040          * detect that condition here, which happens early in CPU bringup,
6041          * before any KVM threads can be running.  Unfortunately, we can't
6042          * bring the TSCs fully up to date with real time, as we aren't yet far
6043          * enough into CPU bringup that we know how much real time has actually
6044          * elapsed; our helper function, get_kernel_ns() will be using boot
6045          * variables that haven't been updated yet.
6046          *
6047          * So we simply find the maximum observed TSC above, then record the
6048          * adjustment to TSC in each VCPU.  When the VCPU later gets loaded,
6049          * the adjustment will be applied.  Note that we accumulate
6050          * adjustments, in case multiple suspend cycles happen before some VCPU
6051          * gets a chance to run again.  In the event that no KVM threads get a
6052          * chance to run, we will miss the entire elapsed period, as we'll have
6053          * reset last_host_tsc, so VCPUs will not have the TSC adjusted and may
6054          * loose cycle time.  This isn't too big a deal, since the loss will be
6055          * uniform across all VCPUs (not to mention the scenario is extremely
6056          * unlikely). It is possible that a second hibernate recovery happens
6057          * much faster than a first, causing the observed TSC here to be
6058          * smaller; this would require additional padding adjustment, which is
6059          * why we set last_host_tsc to the local tsc observed here.
6060          *
6061          * N.B. - this code below runs only on platforms with reliable TSC,
6062          * as that is the only way backwards_tsc is set above.  Also note
6063          * that this runs for ALL vcpus, which is not a bug; all VCPUs should
6064          * have the same delta_cyc adjustment applied if backwards_tsc
6065          * is detected.  Note further, this adjustment is only done once,
6066          * as we reset last_host_tsc on all VCPUs to stop this from being
6067          * called multiple times (one for each physical CPU bringup).
6068          *
6069          * Platforms with unnreliable TSCs don't have to deal with this, they
6070          * will be compensated by the logic in vcpu_load, which sets the TSC to
6071          * catchup mode.  This will catchup all VCPUs to real time, but cannot
6072          * guarantee that they stay in perfect synchronization.
6073          */
6074         if (backwards_tsc) {
6075                 u64 delta_cyc = max_tsc - local_tsc;
6076                 list_for_each_entry(kvm, &vm_list, vm_list) {
6077                         kvm_for_each_vcpu(i, vcpu, kvm) {
6078                                 vcpu->arch.tsc_offset_adjustment += delta_cyc;
6079                                 vcpu->arch.last_host_tsc = local_tsc;
6080                         }
6081
6082                         /*
6083                          * We have to disable TSC offset matching.. if you were
6084                          * booting a VM while issuing an S4 host suspend....
6085                          * you may have some problem.  Solving this issue is
6086                          * left as an exercise to the reader.
6087                          */
6088                         kvm->arch.last_tsc_nsec = 0;
6089                         kvm->arch.last_tsc_write = 0;
6090                 }
6091
6092         }
6093         return 0;
6094 }
6095
6096 void kvm_arch_hardware_disable(void *garbage)
6097 {
6098         kvm_x86_ops->hardware_disable(garbage);
6099         drop_user_return_notifiers(garbage);
6100 }
6101
6102 int kvm_arch_hardware_setup(void)
6103 {
6104         return kvm_x86_ops->hardware_setup();
6105 }
6106
6107 void kvm_arch_hardware_unsetup(void)
6108 {
6109         kvm_x86_ops->hardware_unsetup();
6110 }
6111
6112 void kvm_arch_check_processor_compat(void *rtn)
6113 {
6114         kvm_x86_ops->check_processor_compatibility(rtn);
6115 }
6116
6117 bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu)
6118 {
6119         return irqchip_in_kernel(vcpu->kvm) == (vcpu->arch.apic != NULL);
6120 }
6121
6122 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
6123 {
6124         struct page *page;
6125         struct kvm *kvm;
6126         int r;
6127
6128         BUG_ON(vcpu->kvm == NULL);
6129         kvm = vcpu->kvm;
6130
6131         vcpu->arch.emulate_ctxt.ops = &emulate_ops;
6132         if (!irqchip_in_kernel(kvm) || kvm_vcpu_is_bsp(vcpu))
6133                 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
6134         else
6135                 vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED;
6136
6137         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
6138         if (!page) {
6139                 r = -ENOMEM;
6140                 goto fail;
6141         }
6142         vcpu->arch.pio_data = page_address(page);
6143
6144         kvm_set_tsc_khz(vcpu, max_tsc_khz);
6145
6146         r = kvm_mmu_create(vcpu);
6147         if (r < 0)
6148                 goto fail_free_pio_data;
6149
6150         if (irqchip_in_kernel(kvm)) {
6151                 r = kvm_create_lapic(vcpu);
6152                 if (r < 0)
6153                         goto fail_mmu_destroy;
6154         }
6155
6156         vcpu->arch.mce_banks = kzalloc(KVM_MAX_MCE_BANKS * sizeof(u64) * 4,
6157                                        GFP_KERNEL);
6158         if (!vcpu->arch.mce_banks) {
6159                 r = -ENOMEM;
6160                 goto fail_free_lapic;
6161         }
6162         vcpu->arch.mcg_cap = KVM_MAX_MCE_BANKS;
6163
6164         if (!zalloc_cpumask_var(&vcpu->arch.wbinvd_dirty_mask, GFP_KERNEL))
6165                 goto fail_free_mce_banks;
6166
6167         kvm_async_pf_hash_reset(vcpu);
6168         kvm_pmu_init(vcpu);
6169
6170         return 0;
6171 fail_free_mce_banks:
6172         kfree(vcpu->arch.mce_banks);
6173 fail_free_lapic:
6174         kvm_free_lapic(vcpu);
6175 fail_mmu_destroy:
6176         kvm_mmu_destroy(vcpu);
6177 fail_free_pio_data:
6178         free_page((unsigned long)vcpu->arch.pio_data);
6179 fail:
6180         return r;
6181 }
6182
6183 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
6184 {
6185         int idx;
6186
6187         kvm_pmu_destroy(vcpu);
6188         kfree(vcpu->arch.mce_banks);
6189         kvm_free_lapic(vcpu);
6190         idx = srcu_read_lock(&vcpu->kvm->srcu);
6191         kvm_mmu_destroy(vcpu);
6192         srcu_read_unlock(&vcpu->kvm->srcu, idx);
6193         free_page((unsigned long)vcpu->arch.pio_data);
6194 }
6195
6196 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
6197 {
6198         if (type)
6199                 return -EINVAL;
6200
6201         INIT_LIST_HEAD(&kvm->arch.active_mmu_pages);
6202         INIT_LIST_HEAD(&kvm->arch.assigned_dev_head);
6203
6204         /* Reserve bit 0 of irq_sources_bitmap for userspace irq source */
6205         set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap);
6206
6207         raw_spin_lock_init(&kvm->arch.tsc_write_lock);
6208
6209         return 0;
6210 }
6211
6212 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
6213 {
6214         vcpu_load(vcpu);
6215         kvm_mmu_unload(vcpu);
6216         vcpu_put(vcpu);
6217 }
6218
6219 static void kvm_free_vcpus(struct kvm *kvm)
6220 {
6221         unsigned int i;
6222         struct kvm_vcpu *vcpu;
6223
6224         /*
6225          * Unpin any mmu pages first.
6226          */
6227         kvm_for_each_vcpu(i, vcpu, kvm) {
6228                 kvm_clear_async_pf_completion_queue(vcpu);
6229                 kvm_unload_vcpu_mmu(vcpu);
6230         }
6231         kvm_for_each_vcpu(i, vcpu, kvm)
6232                 kvm_arch_vcpu_free(vcpu);
6233
6234         mutex_lock(&kvm->lock);
6235         for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
6236                 kvm->vcpus[i] = NULL;
6237
6238         atomic_set(&kvm->online_vcpus, 0);
6239         mutex_unlock(&kvm->lock);
6240 }
6241
6242 void kvm_arch_sync_events(struct kvm *kvm)
6243 {
6244         kvm_free_all_assigned_devices(kvm);
6245         kvm_free_pit(kvm);
6246 }
6247
6248 void kvm_arch_destroy_vm(struct kvm *kvm)
6249 {
6250         kvm_iommu_unmap_guest(kvm);
6251         kfree(kvm->arch.vpic);
6252         kfree(kvm->arch.vioapic);
6253         kvm_free_vcpus(kvm);
6254         if (kvm->arch.apic_access_page)
6255                 put_page(kvm->arch.apic_access_page);
6256         if (kvm->arch.ept_identity_pagetable)
6257                 put_page(kvm->arch.ept_identity_pagetable);
6258 }
6259
6260 void kvm_arch_free_memslot(struct kvm_memory_slot *free,
6261                            struct kvm_memory_slot *dont)
6262 {
6263         int i;
6264
6265         for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
6266                 if (!dont || free->arch.lpage_info[i] != dont->arch.lpage_info[i]) {
6267                         vfree(free->arch.lpage_info[i]);
6268                         free->arch.lpage_info[i] = NULL;
6269                 }
6270         }
6271 }
6272
6273 int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages)
6274 {
6275         int i;
6276
6277         for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
6278                 unsigned long ugfn;
6279                 int lpages;
6280                 int level = i + 2;
6281
6282                 lpages = gfn_to_index(slot->base_gfn + npages - 1,
6283                                       slot->base_gfn, level) + 1;
6284
6285                 slot->arch.lpage_info[i] =
6286                         vzalloc(lpages * sizeof(*slot->arch.lpage_info[i]));
6287                 if (!slot->arch.lpage_info[i])
6288                         goto out_free;
6289
6290                 if (slot->base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1))
6291                         slot->arch.lpage_info[i][0].write_count = 1;
6292                 if ((slot->base_gfn + npages) & (KVM_PAGES_PER_HPAGE(level) - 1))
6293                         slot->arch.lpage_info[i][lpages - 1].write_count = 1;
6294                 ugfn = slot->userspace_addr >> PAGE_SHIFT;
6295                 /*
6296                  * If the gfn and userspace address are not aligned wrt each
6297                  * other, or if explicitly asked to, disable large page
6298                  * support for this slot
6299                  */
6300                 if ((slot->base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
6301                     !kvm_largepages_enabled()) {
6302                         unsigned long j;
6303
6304                         for (j = 0; j < lpages; ++j)
6305                                 slot->arch.lpage_info[i][j].write_count = 1;
6306                 }
6307         }
6308
6309         return 0;
6310
6311 out_free:
6312         for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
6313                 vfree(slot->arch.lpage_info[i]);
6314                 slot->arch.lpage_info[i] = NULL;
6315         }
6316         return -ENOMEM;
6317 }
6318
6319 int kvm_arch_prepare_memory_region(struct kvm *kvm,
6320                                 struct kvm_memory_slot *memslot,
6321                                 struct kvm_memory_slot old,
6322                                 struct kvm_userspace_memory_region *mem,
6323                                 int user_alloc)
6324 {
6325         int npages = memslot->npages;
6326         int map_flags = MAP_PRIVATE | MAP_ANONYMOUS;
6327
6328         /* Prevent internal slot pages from being moved by fork()/COW. */
6329         if (memslot->id >= KVM_MEMORY_SLOTS)
6330                 map_flags = MAP_SHARED | MAP_ANONYMOUS;
6331
6332         /*To keep backward compatibility with older userspace,
6333          *x86 needs to hanlde !user_alloc case.
6334          */
6335         if (!user_alloc) {
6336                 if (npages && !old.rmap) {
6337                         unsigned long userspace_addr;
6338
6339                         userspace_addr = vm_mmap(NULL, 0,
6340                                                  npages * PAGE_SIZE,
6341                                                  PROT_READ | PROT_WRITE,
6342                                                  map_flags,
6343                                                  0);
6344
6345                         if (IS_ERR((void *)userspace_addr))
6346                                 return PTR_ERR((void *)userspace_addr);
6347
6348                         memslot->userspace_addr = userspace_addr;
6349                 }
6350         }
6351
6352
6353         return 0;
6354 }
6355
6356 void kvm_arch_commit_memory_region(struct kvm *kvm,
6357                                 struct kvm_userspace_memory_region *mem,
6358                                 struct kvm_memory_slot old,
6359                                 int user_alloc)
6360 {
6361
6362         int nr_mmu_pages = 0, npages = mem->memory_size >> PAGE_SHIFT;
6363
6364         if (!user_alloc && !old.user_alloc && old.rmap && !npages) {
6365                 int ret;
6366
6367                 ret = vm_munmap(current->mm, old.userspace_addr,
6368                                 old.npages * PAGE_SIZE);
6369                 if (ret < 0)
6370                         printk(KERN_WARNING
6371                                "kvm_vm_ioctl_set_memory_region: "
6372                                "failed to munmap memory\n");
6373         }
6374
6375         if (!kvm->arch.n_requested_mmu_pages)
6376                 nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm);
6377
6378         spin_lock(&kvm->mmu_lock);
6379         if (nr_mmu_pages)
6380                 kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
6381         kvm_mmu_slot_remove_write_access(kvm, mem->slot);
6382         spin_unlock(&kvm->mmu_lock);
6383 }
6384
6385 void kvm_arch_flush_shadow(struct kvm *kvm)
6386 {
6387         kvm_mmu_zap_all(kvm);
6388         kvm_reload_remote_mmus(kvm);
6389 }
6390
6391 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
6392 {
6393         return (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE &&
6394                 !vcpu->arch.apf.halted)
6395                 || !list_empty_careful(&vcpu->async_pf.done)
6396                 || vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED
6397                 || atomic_read(&vcpu->arch.nmi_queued) ||
6398                 (kvm_arch_interrupt_allowed(vcpu) &&
6399                  kvm_cpu_has_interrupt(vcpu));
6400 }
6401
6402 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
6403 {
6404         int me;
6405         int cpu = vcpu->cpu;
6406
6407         if (waitqueue_active(&vcpu->wq)) {
6408                 wake_up_interruptible(&vcpu->wq);
6409                 ++vcpu->stat.halt_wakeup;
6410         }
6411
6412         me = get_cpu();
6413         if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
6414                 if (kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE)
6415                         smp_send_reschedule(cpu);
6416         put_cpu();
6417 }
6418
6419 int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu)
6420 {
6421         return kvm_x86_ops->interrupt_allowed(vcpu);
6422 }
6423
6424 bool kvm_is_linear_rip(struct kvm_vcpu *vcpu, unsigned long linear_rip)
6425 {
6426         unsigned long current_rip = kvm_rip_read(vcpu) +
6427                 get_segment_base(vcpu, VCPU_SREG_CS);
6428
6429         return current_rip == linear_rip;
6430 }
6431 EXPORT_SYMBOL_GPL(kvm_is_linear_rip);
6432
6433 unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu)
6434 {
6435         unsigned long rflags;
6436
6437         rflags = kvm_x86_ops->get_rflags(vcpu);
6438         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
6439                 rflags &= ~X86_EFLAGS_TF;
6440         return rflags;
6441 }
6442 EXPORT_SYMBOL_GPL(kvm_get_rflags);
6443
6444 void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
6445 {
6446         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP &&
6447             kvm_is_linear_rip(vcpu, vcpu->arch.singlestep_rip))
6448                 rflags |= X86_EFLAGS_TF;
6449         kvm_x86_ops->set_rflags(vcpu, rflags);
6450         kvm_make_request(KVM_REQ_EVENT, vcpu);
6451 }
6452 EXPORT_SYMBOL_GPL(kvm_set_rflags);
6453
6454 void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, struct kvm_async_pf *work)
6455 {
6456         int r;
6457
6458         if ((vcpu->arch.mmu.direct_map != work->arch.direct_map) ||
6459               is_error_page(work->page))
6460                 return;
6461
6462         r = kvm_mmu_reload(vcpu);
6463         if (unlikely(r))
6464                 return;
6465
6466         if (!vcpu->arch.mmu.direct_map &&
6467               work->arch.cr3 != vcpu->arch.mmu.get_cr3(vcpu))
6468                 return;
6469
6470         vcpu->arch.mmu.page_fault(vcpu, work->gva, 0, true);
6471 }
6472
6473 static inline u32 kvm_async_pf_hash_fn(gfn_t gfn)
6474 {
6475         return hash_32(gfn & 0xffffffff, order_base_2(ASYNC_PF_PER_VCPU));
6476 }
6477
6478 static inline u32 kvm_async_pf_next_probe(u32 key)
6479 {
6480         return (key + 1) & (roundup_pow_of_two(ASYNC_PF_PER_VCPU) - 1);
6481 }
6482
6483 static void kvm_add_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
6484 {
6485         u32 key = kvm_async_pf_hash_fn(gfn);
6486
6487         while (vcpu->arch.apf.gfns[key] != ~0)
6488                 key = kvm_async_pf_next_probe(key);
6489
6490         vcpu->arch.apf.gfns[key] = gfn;
6491 }
6492
6493 static u32 kvm_async_pf_gfn_slot(struct kvm_vcpu *vcpu, gfn_t gfn)
6494 {
6495         int i;
6496         u32 key = kvm_async_pf_hash_fn(gfn);
6497
6498         for (i = 0; i < roundup_pow_of_two(ASYNC_PF_PER_VCPU) &&
6499                      (vcpu->arch.apf.gfns[key] != gfn &&
6500                       vcpu->arch.apf.gfns[key] != ~0); i++)
6501                 key = kvm_async_pf_next_probe(key);
6502
6503         return key;
6504 }
6505
6506 bool kvm_find_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
6507 {
6508         return vcpu->arch.apf.gfns[kvm_async_pf_gfn_slot(vcpu, gfn)] == gfn;
6509 }
6510
6511 static void kvm_del_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
6512 {
6513         u32 i, j, k;
6514
6515         i = j = kvm_async_pf_gfn_slot(vcpu, gfn);
6516         while (true) {
6517                 vcpu->arch.apf.gfns[i] = ~0;
6518                 do {
6519                         j = kvm_async_pf_next_probe(j);
6520                         if (vcpu->arch.apf.gfns[j] == ~0)
6521                                 return;
6522                         k = kvm_async_pf_hash_fn(vcpu->arch.apf.gfns[j]);
6523                         /*
6524                          * k lies cyclically in ]i,j]
6525                          * |    i.k.j |
6526                          * |....j i.k.| or  |.k..j i...|
6527                          */
6528                 } while ((i <= j) ? (i < k && k <= j) : (i < k || k <= j));
6529                 vcpu->arch.apf.gfns[i] = vcpu->arch.apf.gfns[j];
6530                 i = j;
6531         }
6532 }
6533
6534 static int apf_put_user(struct kvm_vcpu *vcpu, u32 val)
6535 {
6536
6537         return kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.apf.data, &val,
6538                                       sizeof(val));
6539 }
6540
6541 void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
6542                                      struct kvm_async_pf *work)
6543 {
6544         struct x86_exception fault;
6545
6546         trace_kvm_async_pf_not_present(work->arch.token, work->gva);
6547         kvm_add_async_pf_gfn(vcpu, work->arch.gfn);
6548
6549         if (!(vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED) ||
6550             (vcpu->arch.apf.send_user_only &&
6551              kvm_x86_ops->get_cpl(vcpu) == 0))
6552                 kvm_make_request(KVM_REQ_APF_HALT, vcpu);
6553         else if (!apf_put_user(vcpu, KVM_PV_REASON_PAGE_NOT_PRESENT)) {
6554                 fault.vector = PF_VECTOR;
6555                 fault.error_code_valid = true;
6556                 fault.error_code = 0;
6557                 fault.nested_page_fault = false;
6558                 fault.address = work->arch.token;
6559                 kvm_inject_page_fault(vcpu, &fault);
6560         }
6561 }
6562
6563 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
6564                                  struct kvm_async_pf *work)
6565 {
6566         struct x86_exception fault;
6567
6568         trace_kvm_async_pf_ready(work->arch.token, work->gva);
6569         if (is_error_page(work->page))
6570                 work->arch.token = ~0; /* broadcast wakeup */
6571         else
6572                 kvm_del_async_pf_gfn(vcpu, work->arch.gfn);
6573
6574         if ((vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED) &&
6575             !apf_put_user(vcpu, KVM_PV_REASON_PAGE_READY)) {
6576                 fault.vector = PF_VECTOR;
6577                 fault.error_code_valid = true;
6578                 fault.error_code = 0;
6579                 fault.nested_page_fault = false;
6580                 fault.address = work->arch.token;
6581                 kvm_inject_page_fault(vcpu, &fault);
6582         }
6583         vcpu->arch.apf.halted = false;
6584 }
6585
6586 bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu)
6587 {
6588         if (!(vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED))
6589                 return true;
6590         else
6591                 return !kvm_event_needs_reinjection(vcpu) &&
6592                         kvm_x86_ops->interrupt_allowed(vcpu);
6593 }
6594
6595 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_exit);
6596 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq);
6597 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_page_fault);
6598 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_msr);
6599 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_cr);
6600 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmrun);
6601 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit);
6602 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit_inject);
6603 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intr_vmexit);
6604 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_invlpga);
6605 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_skinit);
6606 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intercepts);