arch/powerpc/kvm/book3s_pr.c

   1 /*
   2  * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved.
   3  *
   4  * Authors:
   5  *    Alexander Graf <agraf@suse.de>
   6  *    Kevin Wolf <mail@kevin-wolf.de>
   7  *    Paul Mackerras <paulus@samba.org>
   8  *
   9  * Description:
  10  * Functions relating to running KVM on Book 3S processors where
  11  * we don't have access to hypervisor mode, and we run the guest
  12  * in problem state (user mode).
  13  *
  14  * This file is derived from arch/powerpc/kvm/44x.c,
  15  * by Hollis Blanchard <hollisb@us.ibm.com>.
  16  *
  17  * This program is free software; you can redistribute it and/or modify
  18  * it under the terms of the GNU General Public License, version 2, as
  19  * published by the Free Software Foundation.
  20  */
  21
  22 #include <linux/kvm_host.h>
  23 #include <linux/export.h>
  24 #include <linux/err.h>
  25 #include <linux/slab.h>
  26
  27 #include <asm/reg.h>
  28 #include <asm/cputable.h>
  29 #include <asm/cacheflush.h>
  30 #include <asm/tlbflush.h>
  31 #include <asm/uaccess.h>
  32 #include <asm/io.h>
  33 #include <asm/kvm_ppc.h>
  34 #include <asm/kvm_book3s.h>
  35 #include <asm/mmu_context.h>
  36 #include <asm/switch_to.h>
  37 #include <linux/gfp.h>
  38 #include <linux/sched.h>
  39 #include <linux/vmalloc.h>
  40 #include <linux/highmem.h>
  41
  42 #include "trace.h"
  43
  44 /* #define EXIT_DEBUG */
  45 /* #define DEBUG_EXT */
  46
  47 static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
  48                              ulong msr);
  49
  50 /* Some compatibility defines */
  51 #ifdef CONFIG_PPC_BOOK3S_32
  52 #define MSR_USER32 MSR_USER
  53 #define MSR_USER64 MSR_USER
  54 #define HW_PAGE_SIZE PAGE_SIZE
  55 #define __hard_irq_disable local_irq_disable
  56 #define __hard_irq_enable local_irq_enable
  57 #endif
  58
  59 void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
  60 {
  61 #ifdef CONFIG_PPC_BOOK3S_64
  62         struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
  63         memcpy(svcpu->slb, to_book3s(vcpu)->slb_shadow, sizeof(svcpu->slb));
  64         memcpy(&get_paca()->shadow_vcpu, to_book3s(vcpu)->shadow_vcpu,
  65                sizeof(get_paca()->shadow_vcpu));
  66         svcpu->slb_max = to_book3s(vcpu)->slb_shadow_max;
  67         svcpu_put(svcpu);
  68 #endif
  69
  70 #ifdef CONFIG_PPC_BOOK3S_32
  71         current->thread.kvm_shadow_vcpu = to_book3s(vcpu)->shadow_vcpu;
  72 #endif
  73 }
  74
  75 void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
  76 {
  77 #ifdef CONFIG_PPC_BOOK3S_64
  78         struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
  79         memcpy(to_book3s(vcpu)->slb_shadow, svcpu->slb, sizeof(svcpu->slb));
  80         memcpy(to_book3s(vcpu)->shadow_vcpu, &get_paca()->shadow_vcpu,
  81                sizeof(get_paca()->shadow_vcpu));
  82         to_book3s(vcpu)->slb_shadow_max = svcpu->slb_max;
  83         svcpu_put(svcpu);
  84 #endif
  85
  86         kvmppc_giveup_ext(vcpu, MSR_FP);
  87         kvmppc_giveup_ext(vcpu, MSR_VEC);
  88         kvmppc_giveup_ext(vcpu, MSR_VSX);
  89 }
  90
  91 static void kvmppc_recalc_shadow_msr(struct kvm_vcpu *vcpu)
  92 {
  93         ulong smsr = vcpu->arch.shared->msr;
  94
  95         /* Guest MSR values */
  96         smsr &= MSR_FE0 | MSR_FE1 | MSR_SF | MSR_SE | MSR_BE | MSR_DE;
  97         /* Process MSR values */
  98         smsr |= MSR_ME | MSR_RI | MSR_IR | MSR_DR | MSR_PR | MSR_EE;
  99         /* External providers the guest reserved */
 100         smsr |= (vcpu->arch.shared->msr & vcpu->arch.guest_owned_ext);
 101         /* 64-bit Process MSR values */
 102 #ifdef CONFIG_PPC_BOOK3S_64
 103         smsr |= MSR_ISF | MSR_HV;
 104 #endif
 105         vcpu->arch.shadow_msr = smsr;
 106 }
 107
 108 void kvmppc_set_msr(struct kvm_vcpu *vcpu, u64 msr)
 109 {
 110         ulong old_msr = vcpu->arch.shared->msr;
 111
 112 #ifdef EXIT_DEBUG
 113         printk(KERN_INFO "KVM: Set MSR to 0x%llx\n", msr);
 114 #endif
 115
 116         msr &= to_book3s(vcpu)->msr_mask;
 117         vcpu->arch.shared->msr = msr;
 118         kvmppc_recalc_shadow_msr(vcpu);
 119
 120         if (msr & MSR_POW) {
 121                 if (!vcpu->arch.pending_exceptions) {
 122                         kvm_vcpu_block(vcpu);
 123                         vcpu->stat.halt_wakeup++;
 124
 125                         /* Unset POW bit after we woke up */
 126                         msr &= ~MSR_POW;
 127                         vcpu->arch.shared->msr = msr;
 128                 }
 129         }
 130
 131         if ((vcpu->arch.shared->msr & (MSR_PR|MSR_IR|MSR_DR)) !=
 132                    (old_msr & (MSR_PR|MSR_IR|MSR_DR))) {
 133                 kvmppc_mmu_flush_segments(vcpu);
 134                 kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
 135
 136                 /* Preload magic page segment when in kernel mode */
 137                 if (!(msr & MSR_PR) && vcpu->arch.magic_page_pa) {
 138                         struct kvm_vcpu_arch *a = &vcpu->arch;
 139
 140                         if (msr & MSR_DR)
 141                                 kvmppc_mmu_map_segment(vcpu, a->magic_page_ea);
 142                         else
 143                                 kvmppc_mmu_map_segment(vcpu, a->magic_page_pa);
 144                 }
 145         }
 146
 147         /* Preload FPU if it's enabled */
 148         if (vcpu->arch.shared->msr & MSR_FP)
 149                 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
 150 }
 151
 152 void kvmppc_set_pvr(struct kvm_vcpu *vcpu, u32 pvr)
 153 {
 154         u32 host_pvr;
 155
 156         vcpu->arch.hflags &= ~BOOK3S_HFLAG_SLB;
 157         vcpu->arch.pvr = pvr;
 158 #ifdef CONFIG_PPC_BOOK3S_64
 159         if ((pvr >= 0x330000) && (pvr < 0x70330000)) {
 160                 kvmppc_mmu_book3s_64_init(vcpu);
 161                 if (!to_book3s(vcpu)->hior_explicit)
 162                         to_book3s(vcpu)->hior = 0xfff00000;
 163                 to_book3s(vcpu)->msr_mask = 0xffffffffffffffffULL;
 164                 vcpu->arch.cpu_type = KVM_CPU_3S_64;
 165         } else
 166 #endif
 167         {
 168                 kvmppc_mmu_book3s_32_init(vcpu);
 169                 if (!to_book3s(vcpu)->hior_explicit)
 170                         to_book3s(vcpu)->hior = 0;
 171                 to_book3s(vcpu)->msr_mask = 0xffffffffULL;
 172                 vcpu->arch.cpu_type = KVM_CPU_3S_32;
 173         }
 174
 175         kvmppc_sanity_check(vcpu);
 176
 177         /* If we are in hypervisor level on 970, we can tell the CPU to
 178          * treat DCBZ as 32 bytes store */
 179         vcpu->arch.hflags &= ~BOOK3S_HFLAG_DCBZ32;
 180         if (vcpu->arch.mmu.is_dcbz32(vcpu) && (mfmsr() & MSR_HV) &&
 181             !strcmp(cur_cpu_spec->platform, "ppc970"))
 182                 vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
 183
 184         /* Cell performs badly if MSR_FEx are set. So let's hope nobody
 185            really needs them in a VM on Cell and force disable them. */
 186         if (!strcmp(cur_cpu_spec->platform, "ppc-cell-be"))
 187                 to_book3s(vcpu)->msr_mask &= ~(MSR_FE0 | MSR_FE1);
 188
 189 #ifdef CONFIG_PPC_BOOK3S_32
 190         /* 32 bit Book3S always has 32 byte dcbz */
 191         vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
 192 #endif
 193
 194         /* On some CPUs we can execute paired single operations natively */
 195         asm ( "mfpvr %0" : "=r"(host_pvr));
 196         switch (host_pvr) {
 197         case 0x00080200:        /* lonestar 2.0 */
 198         case 0x00088202:        /* lonestar 2.2 */
 199         case 0x70000100:        /* gekko 1.0 */
 200         case 0x00080100:        /* gekko 2.0 */
 201         case 0x00083203:        /* gekko 2.3a */
 202         case 0x00083213:        /* gekko 2.3b */
 203         case 0x00083204:        /* gekko 2.4 */
 204         case 0x00083214:        /* gekko 2.4e (8SE) - retail HW2 */
 205         case 0x00087200:        /* broadway */
 206                 vcpu->arch.hflags |= BOOK3S_HFLAG_NATIVE_PS;
 207                 /* Enable HID2.PSE - in case we need it later */
 208                 mtspr(SPRN_HID2_GEKKO, mfspr(SPRN_HID2_GEKKO) | (1 << 29));
 209         }
 210 }
 211
 212 /* Book3s_32 CPUs always have 32 bytes cache line size, which Linux assumes. To
 213  * make Book3s_32 Linux work on Book3s_64, we have to make sure we trap dcbz to
 214  * emulate 32 bytes dcbz length.
 215  *
 216  * The Book3s_64 inventors also realized this case and implemented a special bit
 217  * in the HID5 register, which is a hypervisor ressource. Thus we can't use it.
 218  *
 219  * My approach here is to patch the dcbz instruction on executing pages.
 220  */
 221 static void kvmppc_patch_dcbz(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
 222 {
 223         struct page *hpage;
 224         u64 hpage_offset;
 225         u32 *page;
 226         int i;
 227
 228         hpage = gfn_to_page(vcpu->kvm, pte->raddr >> PAGE_SHIFT);
 229         if (is_error_page(hpage)) {
 230                 kvm_release_page_clean(hpage);
 231                 return;
 232         }
 233
 234         hpage_offset = pte->raddr & ~PAGE_MASK;
 235         hpage_offset &= ~0xFFFULL;
 236         hpage_offset /= 4;
 237
 238         get_page(hpage);
 239         page = kmap_atomic(hpage);
 240
 241         /* patch dcbz into reserved instruction, so we trap */
 242         for (i=hpage_offset; i < hpage_offset + (HW_PAGE_SIZE / 4); i++)
 243                 if ((page[i] & 0xff0007ff) == INS_DCBZ)
 244                         page[i] &= 0xfffffff7;
 245
 246         kunmap_atomic(page);
 247         put_page(hpage);
 248 }
 249
 250 static int kvmppc_visible_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
 251 {
 252         ulong mp_pa = vcpu->arch.magic_page_pa;
 253
 254         if (unlikely(mp_pa) &&
 255             unlikely((mp_pa & KVM_PAM) >> PAGE_SHIFT == gfn)) {
 256                 return 1;
 257         }
 258
 259         return kvm_is_visible_gfn(vcpu->kvm, gfn);
 260 }
 261
 262 int kvmppc_handle_pagefault(struct kvm_run *run, struct kvm_vcpu *vcpu,
 263                             ulong eaddr, int vec)
 264 {
 265         bool data = (vec == BOOK3S_INTERRUPT_DATA_STORAGE);
 266         int r = RESUME_GUEST;
 267         int relocated;
 268         int page_found = 0;
 269         struct kvmppc_pte pte;
 270         bool is_mmio = false;
 271         bool dr = (vcpu->arch.shared->msr & MSR_DR) ? true : false;
 272         bool ir = (vcpu->arch.shared->msr & MSR_IR) ? true : false;
 273         u64 vsid;
 274
 275         relocated = data ? dr : ir;
 276
 277         /* Resolve real address if translation turned on */
 278         if (relocated) {
 279                 page_found = vcpu->arch.mmu.xlate(vcpu, eaddr, &pte, data);
 280         } else {
 281                 pte.may_execute = true;
 282                 pte.may_read = true;
 283                 pte.may_write = true;
 284                 pte.raddr = eaddr & KVM_PAM;
 285                 pte.eaddr = eaddr;
 286                 pte.vpage = eaddr >> 12;
 287         }
 288
 289         switch (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) {
 290         case 0:
 291                 pte.vpage |= ((u64)VSID_REAL << (SID_SHIFT - 12));
 292                 break;
 293         case MSR_DR:
 294         case MSR_IR:
 295                 vcpu->arch.mmu.esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid);
 296
 297                 if ((vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) == MSR_DR)
 298                         pte.vpage |= ((u64)VSID_REAL_DR << (SID_SHIFT - 12));
 299                 else
 300                         pte.vpage |= ((u64)VSID_REAL_IR << (SID_SHIFT - 12));
 301                 pte.vpage |= vsid;
 302
 303                 if (vsid == -1)
 304                         page_found = -EINVAL;
 305                 break;
 306         }
 307
 308         if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
 309            (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
 310                 /*
 311                  * If we do the dcbz hack, we have to NX on every execution,
 312                  * so we can patch the executing code. This renders our guest
 313                  * NX-less.
 314                  */
 315                 pte.may_execute = !data;
 316         }
 317
 318         if (page_found == -ENOENT) {
 319                 /* Page not found in guest PTE entries */
 320                 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 321                 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
 322                 vcpu->arch.shared->dsisr = svcpu->fault_dsisr;
 323                 vcpu->arch.shared->msr |=
 324                         (svcpu->shadow_srr1 & 0x00000000f8000000ULL);
 325                 svcpu_put(svcpu);
 326                 kvmppc_book3s_queue_irqprio(vcpu, vec);
 327         } else if (page_found == -EPERM) {
 328                 /* Storage protection */
 329                 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 330                 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
 331                 vcpu->arch.shared->dsisr = svcpu->fault_dsisr & ~DSISR_NOHPTE;
 332                 vcpu->arch.shared->dsisr |= DSISR_PROTFAULT;
 333                 vcpu->arch.shared->msr |=
 334                         svcpu->shadow_srr1 & 0x00000000f8000000ULL;
 335                 svcpu_put(svcpu);
 336                 kvmppc_book3s_queue_irqprio(vcpu, vec);
 337         } else if (page_found == -EINVAL) {
 338                 /* Page not found in guest SLB */
 339                 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
 340                 kvmppc_book3s_queue_irqprio(vcpu, vec + 0x80);
 341         } else if (!is_mmio &&
 342                    kvmppc_visible_gfn(vcpu, pte.raddr >> PAGE_SHIFT)) {
 343                 /* The guest's PTE is not mapped yet. Map on the host */
 344                 kvmppc_mmu_map_page(vcpu, &pte);
 345                 if (data)
 346                         vcpu->stat.sp_storage++;
 347                 else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
 348                         (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32)))
 349                         kvmppc_patch_dcbz(vcpu, &pte);
 350         } else {
 351                 /* MMIO */
 352                 vcpu->stat.mmio_exits++;
 353                 vcpu->arch.paddr_accessed = pte.raddr;
 354                 r = kvmppc_emulate_mmio(run, vcpu);
 355                 if ( r == RESUME_HOST_NV )
 356                         r = RESUME_HOST;
 357         }
 358
 359         return r;
 360 }
 361
 362 static inline int get_fpr_index(int i)
 363 {
 364 #ifdef CONFIG_VSX
 365         i *= 2;
 366 #endif
 367         return i;
 368 }
 369
 370 /* Give up external provider (FPU, Altivec, VSX) */
 371 void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr)
 372 {
 373         struct thread_struct *t = &current->thread;
 374         u64 *vcpu_fpr = vcpu->arch.fpr;
 375 #ifdef CONFIG_VSX
 376         u64 *vcpu_vsx = vcpu->arch.vsr;
 377 #endif
 378         u64 *thread_fpr = (u64*)t->fpr;
 379         int i;
 380
 381         if (!(vcpu->arch.guest_owned_ext & msr))
 382                 return;
 383
 384 #ifdef DEBUG_EXT
 385         printk(KERN_INFO "Giving up ext 0x%lx\n", msr);
 386 #endif
 387
 388         switch (msr) {
 389         case MSR_FP:
 390                 giveup_fpu(current);
 391                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++)
 392                         vcpu_fpr[i] = thread_fpr[get_fpr_index(i)];
 393
 394                 vcpu->arch.fpscr = t->fpscr.val;
 395                 break;
 396         case MSR_VEC:
 397 #ifdef CONFIG_ALTIVEC
 398                 giveup_altivec(current);
 399                 memcpy(vcpu->arch.vr, t->vr, sizeof(vcpu->arch.vr));
 400                 vcpu->arch.vscr = t->vscr;
 401 #endif
 402                 break;
 403         case MSR_VSX:
 404 #ifdef CONFIG_VSX
 405                 __giveup_vsx(current);
 406                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.vsr); i++)
 407                         vcpu_vsx[i] = thread_fpr[get_fpr_index(i) + 1];
 408 #endif
 409                 break;
 410         default:
 411                 BUG();
 412         }
 413
 414         vcpu->arch.guest_owned_ext &= ~msr;
 415         current->thread.regs->msr &= ~msr;
 416         kvmppc_recalc_shadow_msr(vcpu);
 417 }
 418
 419 static int kvmppc_read_inst(struct kvm_vcpu *vcpu)
 420 {
 421         ulong srr0 = kvmppc_get_pc(vcpu);
 422         u32 last_inst = kvmppc_get_last_inst(vcpu);
 423         int ret;
 424
 425         ret = kvmppc_ld(vcpu, &srr0, sizeof(u32), &last_inst, false);
 426         if (ret == -ENOENT) {
 427                 ulong msr = vcpu->arch.shared->msr;
 428
 429                 msr = kvmppc_set_field(msr, 33, 33, 1);
 430                 msr = kvmppc_set_field(msr, 34, 36, 0);
 431                 vcpu->arch.shared->msr = kvmppc_set_field(msr, 42, 47, 0);
 432                 kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_INST_STORAGE);
 433                 return EMULATE_AGAIN;
 434         }
 435
 436         return EMULATE_DONE;
 437 }
 438
 439 static int kvmppc_check_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr)
 440 {
 441
 442         /* Need to do paired single emulation? */
 443         if (!(vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE))
 444                 return EMULATE_DONE;
 445
 446         /* Read out the instruction */
 447         if (kvmppc_read_inst(vcpu) == EMULATE_DONE)
 448                 /* Need to emulate */
 449                 return EMULATE_FAIL;
 450
 451         return EMULATE_AGAIN;
 452 }
 453
 454 /* Handle external providers (FPU, Altivec, VSX) */
 455 static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
 456                              ulong msr)
 457 {
 458         struct thread_struct *t = &current->thread;
 459         u64 *vcpu_fpr = vcpu->arch.fpr;
 460 #ifdef CONFIG_VSX
 461         u64 *vcpu_vsx = vcpu->arch.vsr;
 462 #endif
 463         u64 *thread_fpr = (u64*)t->fpr;
 464         int i;
 465
 466         /* When we have paired singles, we emulate in software */
 467         if (vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE)
 468                 return RESUME_GUEST;
 469
 470         if (!(vcpu->arch.shared->msr & msr)) {
 471                 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 472                 return RESUME_GUEST;
 473         }
 474
 475         /* We already own the ext */
 476         if (vcpu->arch.guest_owned_ext & msr) {
 477                 return RESUME_GUEST;
 478         }
 479
 480 #ifdef DEBUG_EXT
 481         printk(KERN_INFO "Loading up ext 0x%lx\n", msr);
 482 #endif
 483
 484         current->thread.regs->msr |= msr;
 485
 486         switch (msr) {
 487         case MSR_FP:
 488                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++)
 489                         thread_fpr[get_fpr_index(i)] = vcpu_fpr[i];
 490
 491                 t->fpscr.val = vcpu->arch.fpscr;
 492                 t->fpexc_mode = 0;
 493                 kvmppc_load_up_fpu();
 494                 break;
 495         case MSR_VEC:
 496 #ifdef CONFIG_ALTIVEC
 497                 memcpy(t->vr, vcpu->arch.vr, sizeof(vcpu->arch.vr));
 498                 t->vscr = vcpu->arch.vscr;
 499                 t->vrsave = -1;
 500                 kvmppc_load_up_altivec();
 501 #endif
 502                 break;
 503         case MSR_VSX:
 504 #ifdef CONFIG_VSX
 505                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.vsr); i++)
 506                         thread_fpr[get_fpr_index(i) + 1] = vcpu_vsx[i];
 507                 kvmppc_load_up_vsx();
 508 #endif
 509                 break;
 510         default:
 511                 BUG();
 512         }
 513
 514         vcpu->arch.guest_owned_ext |= msr;
 515
 516         kvmppc_recalc_shadow_msr(vcpu);
 517
 518         return RESUME_GUEST;
 519 }
 520
 521 int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
 522                        unsigned int exit_nr)
 523 {
 524         int r = RESUME_HOST;
 525
 526         vcpu->stat.sum_exits++;
 527
 528         run->exit_reason = KVM_EXIT_UNKNOWN;
 529         run->ready_for_interrupt_injection = 1;
 530
 531         trace_kvm_book3s_exit(exit_nr, vcpu);
 532         preempt_enable();
 533         kvm_resched(vcpu);
 534         switch (exit_nr) {
 535         case BOOK3S_INTERRUPT_INST_STORAGE:
 536         {
 537                 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 538                 ulong shadow_srr1 = svcpu->shadow_srr1;
 539                 vcpu->stat.pf_instruc++;
 540
 541 #ifdef CONFIG_PPC_BOOK3S_32
 542                 /* We set segments as unused segments when invalidating them. So
 543                  * treat the respective fault as segment fault. */
 544                 if (svcpu->sr[kvmppc_get_pc(vcpu) >> SID_SHIFT] == SR_INVALID) {
 545                         kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
 546                         r = RESUME_GUEST;
 547                         svcpu_put(svcpu);
 548                         break;
 549                 }
 550 #endif
 551                 svcpu_put(svcpu);
 552
 553                 /* only care about PTEG not found errors, but leave NX alone */
 554                 if (shadow_srr1 & 0x40000000) {
 555                         r = kvmppc_handle_pagefault(run, vcpu, kvmppc_get_pc(vcpu), exit_nr);
 556                         vcpu->stat.sp_instruc++;
 557                 } else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
 558                           (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
 559                         /*
 560                          * XXX If we do the dcbz hack we use the NX bit to flush&patch the page,
 561                          *     so we can't use the NX bit inside the guest. Let's cross our fingers,
 562                          *     that no guest that needs the dcbz hack does NX.
 563                          */
 564                         kvmppc_mmu_pte_flush(vcpu, kvmppc_get_pc(vcpu), ~0xFFFUL);
 565                         r = RESUME_GUEST;
 566                 } else {
 567                         vcpu->arch.shared->msr |= shadow_srr1 & 0x58000000;
 568                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 569                         r = RESUME_GUEST;
 570                 }
 571                 break;
 572         }
 573         case BOOK3S_INTERRUPT_DATA_STORAGE:
 574         {
 575                 ulong dar = kvmppc_get_fault_dar(vcpu);
 576                 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 577                 u32 fault_dsisr = svcpu->fault_dsisr;
 578                 vcpu->stat.pf_storage++;
 579
 580 #ifdef CONFIG_PPC_BOOK3S_32
 581                 /* We set segments as unused segments when invalidating them. So
 582                  * treat the respective fault as segment fault. */
 583                 if ((svcpu->sr[dar >> SID_SHIFT]) == SR_INVALID) {
 584                         kvmppc_mmu_map_segment(vcpu, dar);
 585                         r = RESUME_GUEST;
 586                         svcpu_put(svcpu);
 587                         break;
 588                 }
 589 #endif
 590                 svcpu_put(svcpu);
 591
 592                 /* The only case we need to handle is missing shadow PTEs */
 593                 if (fault_dsisr & DSISR_NOHPTE) {
 594                         r = kvmppc_handle_pagefault(run, vcpu, dar, exit_nr);
 595                 } else {
 596                         vcpu->arch.shared->dar = dar;
 597                         vcpu->arch.shared->dsisr = fault_dsisr;
 598                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 599                         r = RESUME_GUEST;
 600                 }
 601                 break;
 602         }
 603         case BOOK3S_INTERRUPT_DATA_SEGMENT:
 604                 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_fault_dar(vcpu)) < 0) {
 605                         vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
 606                         kvmppc_book3s_queue_irqprio(vcpu,
 607                                 BOOK3S_INTERRUPT_DATA_SEGMENT);
 608                 }
 609                 r = RESUME_GUEST;
 610                 break;
 611         case BOOK3S_INTERRUPT_INST_SEGMENT:
 612                 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu)) < 0) {
 613                         kvmppc_book3s_queue_irqprio(vcpu,
 614                                 BOOK3S_INTERRUPT_INST_SEGMENT);
 615                 }
 616                 r = RESUME_GUEST;
 617                 break;
 618         /* We're good on these - the host merely wanted to get our attention */
 619         case BOOK3S_INTERRUPT_DECREMENTER:
 620                 vcpu->stat.dec_exits++;
 621                 r = RESUME_GUEST;
 622                 break;
 623         case BOOK3S_INTERRUPT_EXTERNAL:
 624                 vcpu->stat.ext_intr_exits++;
 625                 r = RESUME_GUEST;
 626                 break;
 627         case BOOK3S_INTERRUPT_PERFMON:
 628                 r = RESUME_GUEST;
 629                 break;
 630         case BOOK3S_INTERRUPT_PROGRAM:
 631         {
 632                 enum emulation_result er;
 633                 struct kvmppc_book3s_shadow_vcpu *svcpu;
 634                 ulong flags;
 635
 636 program_interrupt:
 637                 svcpu = svcpu_get(vcpu);
 638                 flags = svcpu->shadow_srr1 & 0x1f0000ull;
 639                 svcpu_put(svcpu);
 640
 641                 if (vcpu->arch.shared->msr & MSR_PR) {
 642 #ifdef EXIT_DEBUG
 643                         printk(KERN_INFO "Userspace triggered 0x700 exception at 0x%lx (0x%x)\n", kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu));
 644 #endif
 645                         if ((kvmppc_get_last_inst(vcpu) & 0xff0007ff) !=
 646                             (INS_DCBZ & 0xfffffff7)) {
 647                                 kvmppc_core_queue_program(vcpu, flags);
 648                                 r = RESUME_GUEST;
 649                                 break;
 650                         }
 651                 }
 652
 653                 vcpu->stat.emulated_inst_exits++;
 654                 er = kvmppc_emulate_instruction(run, vcpu);
 655                 switch (er) {
 656                 case EMULATE_DONE:
 657                         r = RESUME_GUEST_NV;
 658                         break;
 659                 case EMULATE_AGAIN:
 660                         r = RESUME_GUEST;
 661                         break;
 662                 case EMULATE_FAIL:
 663                         printk(KERN_CRIT "%s: emulation at %lx failed (%08x)\n",
 664                                __func__, kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu));
 665                         kvmppc_core_queue_program(vcpu, flags);
 666                         r = RESUME_GUEST;
 667                         break;
 668                 case EMULATE_DO_MMIO:
 669                         run->exit_reason = KVM_EXIT_MMIO;
 670                         r = RESUME_HOST_NV;
 671                         break;
 672                 default:
 673                         BUG();
 674                 }
 675                 break;
 676         }
 677         case BOOK3S_INTERRUPT_SYSCALL:
 678                 if (vcpu->arch.papr_enabled &&
 679                     (kvmppc_get_last_inst(vcpu) == 0x44000022) &&
 680                     !(vcpu->arch.shared->msr & MSR_PR)) {
 681                         /* SC 1 papr hypercalls */
 682                         ulong cmd = kvmppc_get_gpr(vcpu, 3);
 683                         int i;
 684
 685 #ifdef CONFIG_KVM_BOOK3S_64_PR
 686                         if (kvmppc_h_pr(vcpu, cmd) == EMULATE_DONE) {
 687                                 r = RESUME_GUEST;
 688                                 break;
 689                         }
 690 #endif
 691
 692                         run->papr_hcall.nr = cmd;
 693                         for (i = 0; i < 9; ++i) {
 694                                 ulong gpr = kvmppc_get_gpr(vcpu, 4 + i);
 695                                 run->papr_hcall.args[i] = gpr;
 696                         }
 697                         run->exit_reason = KVM_EXIT_PAPR_HCALL;
 698                         vcpu->arch.hcall_needed = 1;
 699                         r = RESUME_HOST;
 700                 } else if (vcpu->arch.osi_enabled &&
 701                     (((u32)kvmppc_get_gpr(vcpu, 3)) == OSI_SC_MAGIC_R3) &&
 702                     (((u32)kvmppc_get_gpr(vcpu, 4)) == OSI_SC_MAGIC_R4)) {
 703                         /* MOL hypercalls */
 704                         u64 *gprs = run->osi.gprs;
 705                         int i;
 706
 707                         run->exit_reason = KVM_EXIT_OSI;
 708                         for (i = 0; i < 32; i++)
 709                                 gprs[i] = kvmppc_get_gpr(vcpu, i);
 710                         vcpu->arch.osi_needed = 1;
 711                         r = RESUME_HOST_NV;
 712                 } else if (!(vcpu->arch.shared->msr & MSR_PR) &&
 713                     (((u32)kvmppc_get_gpr(vcpu, 0)) == KVM_SC_MAGIC_R0)) {
 714                         /* KVM PV hypercalls */
 715                         kvmppc_set_gpr(vcpu, 3, kvmppc_kvm_pv(vcpu));
 716                         r = RESUME_GUEST;
 717                 } else {
 718                         /* Guest syscalls */
 719                         vcpu->stat.syscall_exits++;
 720                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 721                         r = RESUME_GUEST;
 722                 }
 723                 break;
 724         case BOOK3S_INTERRUPT_FP_UNAVAIL:
 725         case BOOK3S_INTERRUPT_ALTIVEC:
 726         case BOOK3S_INTERRUPT_VSX:
 727         {
 728                 int ext_msr = 0;
 729
 730                 switch (exit_nr) {
 731                 case BOOK3S_INTERRUPT_FP_UNAVAIL: ext_msr = MSR_FP;  break;
 732                 case BOOK3S_INTERRUPT_ALTIVEC:    ext_msr = MSR_VEC; break;
 733                 case BOOK3S_INTERRUPT_VSX:        ext_msr = MSR_VSX; break;
 734                 }
 735
 736                 switch (kvmppc_check_ext(vcpu, exit_nr)) {
 737                 case EMULATE_DONE:
 738                         /* everything ok - let's enable the ext */
 739                         r = kvmppc_handle_ext(vcpu, exit_nr, ext_msr);
 740                         break;
 741                 case EMULATE_FAIL:
 742                         /* we need to emulate this instruction */
 743                         goto program_interrupt;
 744                         break;
 745                 default:
 746                         /* nothing to worry about - go again */
 747                         break;
 748                 }
 749                 break;
 750         }
 751         case BOOK3S_INTERRUPT_ALIGNMENT:
 752                 if (kvmppc_read_inst(vcpu) == EMULATE_DONE) {
 753                         vcpu->arch.shared->dsisr = kvmppc_alignment_dsisr(vcpu,
 754                                 kvmppc_get_last_inst(vcpu));
 755                         vcpu->arch.shared->dar = kvmppc_alignment_dar(vcpu,
 756                                 kvmppc_get_last_inst(vcpu));
 757                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 758                 }
 759                 r = RESUME_GUEST;
 760                 break;
 761         case BOOK3S_INTERRUPT_MACHINE_CHECK:
 762         case BOOK3S_INTERRUPT_TRACE:
 763                 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 764                 r = RESUME_GUEST;
 765                 break;
 766         default:
 767         {
 768                 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 769                 ulong shadow_srr1 = svcpu->shadow_srr1;
 770                 svcpu_put(svcpu);
 771                 /* Ugh - bork here! What did we get? */
 772                 printk(KERN_EMERG "exit_nr=0x%x | pc=0x%lx | msr=0x%lx\n",
 773                         exit_nr, kvmppc_get_pc(vcpu), shadow_srr1);
 774                 r = RESUME_HOST;
 775                 BUG();
 776                 break;
 777         }
 778         }
 779
 780         preempt_disable();
 781         if (!(r & RESUME_HOST)) {
 782                 /* To avoid clobbering exit_reason, only check for signals if
 783                  * we aren't already exiting to userspace for some other
 784                  * reason. */
 785
 786                 /*
 787                  * Interrupts could be timers for the guest which we have to
 788                  * inject again, so let's postpone them until we're in the guest
 789                  * and if we really did time things so badly, then we just exit
 790                  * again due to a host external interrupt.
 791                  */
 792                 __hard_irq_disable();
 793                 if (signal_pending(current)) {
 794                         __hard_irq_enable();
 795 #ifdef EXIT_DEBUG
 796                         printk(KERN_EMERG "KVM: Going back to host\n");
 797 #endif
 798                         vcpu->stat.signal_exits++;
 799                         run->exit_reason = KVM_EXIT_INTR;
 800                         r = -EINTR;
 801                 } else {
 802                         /* In case an interrupt came in that was triggered
 803                          * from userspace (like DEC), we need to check what
 804                          * to inject now! */
 805                         kvmppc_core_prepare_to_enter(vcpu);
 806                 }
 807         }
 808
 809         trace_kvm_book3s_reenter(r, vcpu);
 810
 811         return r;
 812 }
 813
 814 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 815                                   struct kvm_sregs *sregs)
 816 {
 817         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 818         int i;
 819
 820         sregs->pvr = vcpu->arch.pvr;
 821
 822         sregs->u.s.sdr1 = to_book3s(vcpu)->sdr1;
 823         if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) {
 824                 for (i = 0; i < 64; i++) {
 825                         sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige | i;
 826                         sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
 827                 }
 828         } else {
 829                 for (i = 0; i < 16; i++)
 830                         sregs->u.s.ppc32.sr[i] = vcpu->arch.shared->sr[i];
 831
 832                 for (i = 0; i < 8; i++) {
 833                         sregs->u.s.ppc32.ibat[i] = vcpu3s->ibat[i].raw;
 834                         sregs->u.s.ppc32.dbat[i] = vcpu3s->dbat[i].raw;
 835                 }
 836         }
 837
 838         return 0;
 839 }
 840
 841 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 842                                   struct kvm_sregs *sregs)
 843 {
 844         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 845         int i;
 846
 847         kvmppc_set_pvr(vcpu, sregs->pvr);
 848
 849         vcpu3s->sdr1 = sregs->u.s.sdr1;
 850         if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) {
 851                 for (i = 0; i < 64; i++) {
 852                         vcpu->arch.mmu.slbmte(vcpu, sregs->u.s.ppc64.slb[i].slbv,
 853                                                     sregs->u.s.ppc64.slb[i].slbe);
 854                 }
 855         } else {
 856                 for (i = 0; i < 16; i++) {
 857                         vcpu->arch.mmu.mtsrin(vcpu, i, sregs->u.s.ppc32.sr[i]);
 858                 }
 859                 for (i = 0; i < 8; i++) {
 860                         kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), false,
 861                                        (u32)sregs->u.s.ppc32.ibat[i]);
 862                         kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), true,
 863                                        (u32)(sregs->u.s.ppc32.ibat[i] >> 32));
 864                         kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), false,
 865                                        (u32)sregs->u.s.ppc32.dbat[i]);
 866                         kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), true,
 867                                        (u32)(sregs->u.s.ppc32.dbat[i] >> 32));
 868                 }
 869         }
 870
 871         /* Flush the MMU after messing with the segments */
 872         kvmppc_mmu_pte_flush(vcpu, 0, 0);
 873
 874         return 0;
 875 }
 876
 877 int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
 878 {
 879         int r = -EINVAL;
 880
 881         switch (reg->id) {
 882         case KVM_REG_PPC_HIOR:
 883                 r = copy_to_user((u64 __user *)(long)reg->addr,
 884                                 &to_book3s(vcpu)->hior, sizeof(u64));
 885                 break;
 886         default:
 887                 break;
 888         }
 889
 890         return r;
 891 }
 892
 893 int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
 894 {
 895         int r = -EINVAL;
 896
 897         switch (reg->id) {
 898         case KVM_REG_PPC_HIOR:
 899                 r = copy_from_user(&to_book3s(vcpu)->hior,
 900                                    (u64 __user *)(long)reg->addr, sizeof(u64));
 901                 if (!r)
 902                         to_book3s(vcpu)->hior_explicit = true;
 903                 break;
 904         default:
 905                 break;
 906         }
 907
 908         return r;
 909 }
 910
 911 int kvmppc_core_check_processor_compat(void)
 912 {
 913         return 0;
 914 }
 915
 916 struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
 917 {
 918         struct kvmppc_vcpu_book3s *vcpu_book3s;
 919         struct kvm_vcpu *vcpu;
 920         int err = -ENOMEM;
 921         unsigned long p;
 922
 923         vcpu_book3s = vzalloc(sizeof(struct kvmppc_vcpu_book3s));
 924         if (!vcpu_book3s)
 925                 goto out;
 926
 927         vcpu_book3s->shadow_vcpu = (struct kvmppc_book3s_shadow_vcpu *)
 928                 kzalloc(sizeof(*vcpu_book3s->shadow_vcpu), GFP_KERNEL);
 929         if (!vcpu_book3s->shadow_vcpu)
 930                 goto free_vcpu;
 931
 932         vcpu = &vcpu_book3s->vcpu;
 933         err = kvm_vcpu_init(vcpu, kvm, id);
 934         if (err)
 935                 goto free_shadow_vcpu;
 936
 937         p = __get_free_page(GFP_KERNEL|__GFP_ZERO);
 938         /* the real shared page fills the last 4k of our page */
 939         vcpu->arch.shared = (void*)(p + PAGE_SIZE - 4096);
 940         if (!p)
 941                 goto uninit_vcpu;
 942
 943 #ifdef CONFIG_PPC_BOOK3S_64
 944         /* default to book3s_64 (970fx) */
 945         vcpu->arch.pvr = 0x3C0301;
 946 #else
 947         /* default to book3s_32 (750) */
 948         vcpu->arch.pvr = 0x84202;
 949 #endif
 950         kvmppc_set_pvr(vcpu, vcpu->arch.pvr);
 951         vcpu->arch.slb_nr = 64;
 952
 953         vcpu->arch.shadow_msr = MSR_USER64;
 954
 955         err = kvmppc_mmu_init(vcpu);
 956         if (err < 0)
 957                 goto uninit_vcpu;
 958
 959         return vcpu;
 960
 961 uninit_vcpu:
 962         kvm_vcpu_uninit(vcpu);
 963 free_shadow_vcpu:
 964         kfree(vcpu_book3s->shadow_vcpu);
 965 free_vcpu:
 966         vfree(vcpu_book3s);
 967 out:
 968         return ERR_PTR(err);
 969 }
 970
 971 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
 972 {
 973         struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
 974
 975         free_page((unsigned long)vcpu->arch.shared & PAGE_MASK);
 976         kvm_vcpu_uninit(vcpu);
 977         kfree(vcpu_book3s->shadow_vcpu);
 978         vfree(vcpu_book3s);
 979 }
 980
 981 int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
 982 {
 983         int ret;
 984         double fpr[32][TS_FPRWIDTH];
 985         unsigned int fpscr;
 986         int fpexc_mode;
 987 #ifdef CONFIG_ALTIVEC
 988         vector128 vr[32];
 989         vector128 vscr;
 990         unsigned long uninitialized_var(vrsave);
 991         int used_vr;
 992 #endif
 993 #ifdef CONFIG_VSX
 994         int used_vsr;
 995 #endif
 996         ulong ext_msr;
 997
 998         preempt_disable();
 999
1000         /* Check if we can run the vcpu at all */
1001         if (!vcpu->arch.sane) {
1002                 kvm_run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1003                 ret = -EINVAL;
1004                 goto out;
1005         }
1006
1007         kvmppc_core_prepare_to_enter(vcpu);
1008
1009         /*
1010          * Interrupts could be timers for the guest which we have to inject
1011          * again, so let's postpone them until we're in the guest and if we
1012          * really did time things so badly, then we just exit again due to
1013          * a host external interrupt.
1014          */
1015         __hard_irq_disable();
1016
1017         /* No need to go into the guest when all we do is going out */
1018         if (signal_pending(current)) {
1019                 __hard_irq_enable();
1020                 kvm_run->exit_reason = KVM_EXIT_INTR;
1021                 ret = -EINTR;
1022                 goto out;
1023         }
1024
1025         /* Save FPU state in stack */
1026         if (current->thread.regs->msr & MSR_FP)
1027                 giveup_fpu(current);
1028         memcpy(fpr, current->thread.fpr, sizeof(current->thread.fpr));
1029         fpscr = current->thread.fpscr.val;
1030         fpexc_mode = current->thread.fpexc_mode;
1031
1032 #ifdef CONFIG_ALTIVEC
1033         /* Save Altivec state in stack */
1034         used_vr = current->thread.used_vr;
1035         if (used_vr) {
1036                 if (current->thread.regs->msr & MSR_VEC)
1037                         giveup_altivec(current);
1038                 memcpy(vr, current->thread.vr, sizeof(current->thread.vr));
1039                 vscr = current->thread.vscr;
1040                 vrsave = current->thread.vrsave;
1041         }
1042 #endif
1043
1044 #ifdef CONFIG_VSX
1045         /* Save VSX state in stack */
1046         used_vsr = current->thread.used_vsr;
1047         if (used_vsr && (current->thread.regs->msr & MSR_VSX))
1048                         __giveup_vsx(current);
1049 #endif
1050
1051         /* Remember the MSR with disabled extensions */
1052         ext_msr = current->thread.regs->msr;
1053
1054         /* Preload FPU if it's enabled */
1055         if (vcpu->arch.shared->msr & MSR_FP)
1056                 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
1057
1058         kvm_guest_enter();
1059
1060         ret = __kvmppc_vcpu_run(kvm_run, vcpu);
1061
1062         kvm_guest_exit();
1063
1064         current->thread.regs->msr = ext_msr;
1065
1066         /* Make sure we save the guest FPU/Altivec/VSX state */
1067         kvmppc_giveup_ext(vcpu, MSR_FP);
1068         kvmppc_giveup_ext(vcpu, MSR_VEC);
1069         kvmppc_giveup_ext(vcpu, MSR_VSX);
1070
1071         /* Restore FPU state from stack */
1072         memcpy(current->thread.fpr, fpr, sizeof(current->thread.fpr));
1073         current->thread.fpscr.val = fpscr;
1074         current->thread.fpexc_mode = fpexc_mode;
1075
1076 #ifdef CONFIG_ALTIVEC
1077         /* Restore Altivec state from stack */
1078         if (used_vr && current->thread.used_vr) {
1079                 memcpy(current->thread.vr, vr, sizeof(current->thread.vr));
1080                 current->thread.vscr = vscr;
1081                 current->thread.vrsave = vrsave;
1082         }
1083         current->thread.used_vr = used_vr;
1084 #endif
1085
1086 #ifdef CONFIG_VSX
1087         current->thread.used_vsr = used_vsr;
1088 #endif
1089
1090 out:
1091         preempt_enable();
1092         return ret;
1093 }
1094
1095 /*
1096  * Get (and clear) the dirty memory log for a memory slot.
1097  */
1098 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
1099                                       struct kvm_dirty_log *log)
1100 {
1101         struct kvm_memory_slot *memslot;
1102         struct kvm_vcpu *vcpu;
1103         ulong ga, ga_end;
1104         int is_dirty = 0;
1105         int r;
1106         unsigned long n;
1107
1108         mutex_lock(&kvm->slots_lock);
1109
1110         r = kvm_get_dirty_log(kvm, log, &is_dirty);
1111         if (r)
1112                 goto out;
1113
1114         /* If nothing is dirty, don't bother messing with page tables. */
1115         if (is_dirty) {
1116                 memslot = id_to_memslot(kvm->memslots, log->slot);
1117
1118                 ga = memslot->base_gfn << PAGE_SHIFT;
1119                 ga_end = ga + (memslot->npages << PAGE_SHIFT);
1120
1121                 kvm_for_each_vcpu(n, vcpu, kvm)
1122                         kvmppc_mmu_pte_pflush(vcpu, ga, ga_end);
1123
1124                 n = kvm_dirty_bitmap_bytes(memslot);
1125                 memset(memslot->dirty_bitmap, 0, n);
1126         }
1127
1128         r = 0;
1129 out:
1130         mutex_unlock(&kvm->slots_lock);
1131         return r;
1132 }
1133
1134 int kvmppc_core_prepare_memory_region(struct kvm *kvm,
1135                                       struct kvm_userspace_memory_region *mem)
1136 {
1137         return 0;
1138 }
1139
1140 void kvmppc_core_commit_memory_region(struct kvm *kvm,
1141                                 struct kvm_userspace_memory_region *mem)
1142 {
1143 }
1144
1145 int kvmppc_core_init_vm(struct kvm *kvm)
1146 {
1147         return 0;
1148 }
1149
1150 void kvmppc_core_destroy_vm(struct kvm *kvm)
1151 {
1152 }
1153
1154 static int kvmppc_book3s_init(void)
1155 {
1156         int r;
1157
1158         r = kvm_init(NULL, sizeof(struct kvmppc_vcpu_book3s), 0,
1159                      THIS_MODULE);
1160
1161         if (r)
1162                 return r;
1163
1164         r = kvmppc_mmu_hpte_sysinit();
1165
1166         return r;
1167 }
1168
1169 static void kvmppc_book3s_exit(void)
1170 {
1171         kvmppc_mmu_hpte_sysexit();
1172         kvm_exit();
1173 }
1174
1175 module_init(kvmppc_book3s_init);
1176 module_exit(kvmppc_book3s_exit);