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 <linux/gfp.h>
  37 #include <linux/sched.h>
  38 #include <linux/vmalloc.h>
  39 #include <linux/highmem.h>
  40
  41 #include "trace.h"
  42
  43 /* #define EXIT_DEBUG */
  44 /* #define DEBUG_EXT */
  45
  46 static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
  47                              ulong msr);
  48
  49 /* Some compatibility defines */
  50 #ifdef CONFIG_PPC_BOOK3S_32
  51 #define MSR_USER32 MSR_USER
  52 #define MSR_USER64 MSR_USER
  53 #define HW_PAGE_SIZE PAGE_SIZE
  54 #define __hard_irq_disable local_irq_disable
  55 #define __hard_irq_enable local_irq_enable
  56 #endif
  57
  58 void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
  59 {
  60 #ifdef CONFIG_PPC_BOOK3S_64
  61         struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
  62         memcpy(svcpu->slb, to_book3s(vcpu)->slb_shadow, sizeof(svcpu->slb));
  63         memcpy(&get_paca()->shadow_vcpu, to_book3s(vcpu)->shadow_vcpu,
  64                sizeof(get_paca()->shadow_vcpu));
  65         svcpu->slb_max = to_book3s(vcpu)->slb_shadow_max;
  66         svcpu_put(svcpu);
  67 #endif
  68
  69 #ifdef CONFIG_PPC_BOOK3S_32
  70         current->thread.kvm_shadow_vcpu = to_book3s(vcpu)->shadow_vcpu;
  71 #endif
  72 }
  73
  74 void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
  75 {
  76 #ifdef CONFIG_PPC_BOOK3S_64
  77         struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
  78         memcpy(to_book3s(vcpu)->slb_shadow, svcpu->slb, sizeof(svcpu->slb));
  79         memcpy(to_book3s(vcpu)->shadow_vcpu, &get_paca()->shadow_vcpu,
  80                sizeof(get_paca()->shadow_vcpu));
  81         to_book3s(vcpu)->slb_shadow_max = svcpu->slb_max;
  82         svcpu_put(svcpu);
  83 #endif
  84
  85         kvmppc_giveup_ext(vcpu, MSR_FP);
  86         kvmppc_giveup_ext(vcpu, MSR_VEC);
  87         kvmppc_giveup_ext(vcpu, MSR_VSX);
  88 }
  89
  90 static void kvmppc_recalc_shadow_msr(struct kvm_vcpu *vcpu)
  91 {
  92         ulong smsr = vcpu->arch.shared->msr;
  93
  94         /* Guest MSR values */
  95         smsr &= MSR_FE0 | MSR_FE1 | MSR_SF | MSR_SE | MSR_BE | MSR_DE;
  96         /* Process MSR values */
  97         smsr |= MSR_ME | MSR_RI | MSR_IR | MSR_DR | MSR_PR | MSR_EE;
  98         /* External providers the guest reserved */
  99         smsr |= (vcpu->arch.shared->msr & vcpu->arch.guest_owned_ext);
 100         /* 64-bit Process MSR values */
 101 #ifdef CONFIG_PPC_BOOK3S_64
 102         smsr |= MSR_ISF | MSR_HV;
 103 #endif
 104         vcpu->arch.shadow_msr = smsr;
 105 }
 106
 107 void kvmppc_set_msr(struct kvm_vcpu *vcpu, u64 msr)
 108 {
 109         ulong old_msr = vcpu->arch.shared->msr;
 110
 111 #ifdef EXIT_DEBUG
 112         printk(KERN_INFO "KVM: Set MSR to 0x%llx\n", msr);
 113 #endif
 114
 115         msr &= to_book3s(vcpu)->msr_mask;
 116         vcpu->arch.shared->msr = msr;
 117         kvmppc_recalc_shadow_msr(vcpu);
 118
 119         if (msr & MSR_POW) {
 120                 if (!vcpu->arch.pending_exceptions) {
 121                         kvm_vcpu_block(vcpu);
 122                         vcpu->stat.halt_wakeup++;
 123
 124                         /* Unset POW bit after we woke up */
 125                         msr &= ~MSR_POW;
 126                         vcpu->arch.shared->msr = msr;
 127                 }
 128         }
 129
 130         if ((vcpu->arch.shared->msr & (MSR_PR|MSR_IR|MSR_DR)) !=
 131                    (old_msr & (MSR_PR|MSR_IR|MSR_DR))) {
 132                 kvmppc_mmu_flush_segments(vcpu);
 133                 kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
 134
 135                 /* Preload magic page segment when in kernel mode */
 136                 if (!(msr & MSR_PR) && vcpu->arch.magic_page_pa) {
 137                         struct kvm_vcpu_arch *a = &vcpu->arch;
 138
 139                         if (msr & MSR_DR)
 140                                 kvmppc_mmu_map_segment(vcpu, a->magic_page_ea);
 141                         else
 142                                 kvmppc_mmu_map_segment(vcpu, a->magic_page_pa);
 143                 }
 144         }
 145
 146         /* Preload FPU if it's enabled */
 147         if (vcpu->arch.shared->msr & MSR_FP)
 148                 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
 149 }
 150
 151 void kvmppc_set_pvr(struct kvm_vcpu *vcpu, u32 pvr)
 152 {
 153         u32 host_pvr;
 154
 155         vcpu->arch.hflags &= ~BOOK3S_HFLAG_SLB;
 156         vcpu->arch.pvr = pvr;
 157 #ifdef CONFIG_PPC_BOOK3S_64
 158         if ((pvr >= 0x330000) && (pvr < 0x70330000)) {
 159                 kvmppc_mmu_book3s_64_init(vcpu);
 160                 if (!to_book3s(vcpu)->hior_explicit)
 161                         to_book3s(vcpu)->hior = 0xfff00000;
 162                 to_book3s(vcpu)->msr_mask = 0xffffffffffffffffULL;
 163                 vcpu->arch.cpu_type = KVM_CPU_3S_64;
 164         } else
 165 #endif
 166         {
 167                 kvmppc_mmu_book3s_32_init(vcpu);
 168                 if (!to_book3s(vcpu)->hior_explicit)
 169                         to_book3s(vcpu)->hior = 0;
 170                 to_book3s(vcpu)->msr_mask = 0xffffffffULL;
 171                 vcpu->arch.cpu_type = KVM_CPU_3S_32;
 172         }
 173
 174         kvmppc_sanity_check(vcpu);
 175
 176         /* If we are in hypervisor level on 970, we can tell the CPU to
 177          * treat DCBZ as 32 bytes store */
 178         vcpu->arch.hflags &= ~BOOK3S_HFLAG_DCBZ32;
 179         if (vcpu->arch.mmu.is_dcbz32(vcpu) && (mfmsr() & MSR_HV) &&
 180             !strcmp(cur_cpu_spec->platform, "ppc970"))
 181                 vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
 182
 183         /* Cell performs badly if MSR_FEx are set. So let's hope nobody
 184            really needs them in a VM on Cell and force disable them. */
 185         if (!strcmp(cur_cpu_spec->platform, "ppc-cell-be"))
 186                 to_book3s(vcpu)->msr_mask &= ~(MSR_FE0 | MSR_FE1);
 187
 188 #ifdef CONFIG_PPC_BOOK3S_32
 189         /* 32 bit Book3S always has 32 byte dcbz */
 190         vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
 191 #endif
 192
 193         /* On some CPUs we can execute paired single operations natively */
 194         asm ( "mfpvr %0" : "=r"(host_pvr));
 195         switch (host_pvr) {
 196         case 0x00080200:        /* lonestar 2.0 */
 197         case 0x00088202:        /* lonestar 2.2 */
 198         case 0x70000100:        /* gekko 1.0 */
 199         case 0x00080100:        /* gekko 2.0 */
 200         case 0x00083203:        /* gekko 2.3a */
 201         case 0x00083213:        /* gekko 2.3b */
 202         case 0x00083204:        /* gekko 2.4 */
 203         case 0x00083214:        /* gekko 2.4e (8SE) - retail HW2 */
 204         case 0x00087200:        /* broadway */
 205                 vcpu->arch.hflags |= BOOK3S_HFLAG_NATIVE_PS;
 206                 /* Enable HID2.PSE - in case we need it later */
 207                 mtspr(SPRN_HID2_GEKKO, mfspr(SPRN_HID2_GEKKO) | (1 << 29));
 208         }
 209 }
 210
 211 /* Book3s_32 CPUs always have 32 bytes cache line size, which Linux assumes. To
 212  * make Book3s_32 Linux work on Book3s_64, we have to make sure we trap dcbz to
 213  * emulate 32 bytes dcbz length.
 214  *
 215  * The Book3s_64 inventors also realized this case and implemented a special bit
 216  * in the HID5 register, which is a hypervisor ressource. Thus we can't use it.
 217  *
 218  * My approach here is to patch the dcbz instruction on executing pages.
 219  */
 220 static void kvmppc_patch_dcbz(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
 221 {
 222         struct page *hpage;
 223         u64 hpage_offset;
 224         u32 *page;
 225         int i;
 226
 227         hpage = gfn_to_page(vcpu->kvm, pte->raddr >> PAGE_SHIFT);
 228         if (is_error_page(hpage)) {
 229                 kvm_release_page_clean(hpage);
 230                 return;
 231         }
 232
 233         hpage_offset = pte->raddr & ~PAGE_MASK;
 234         hpage_offset &= ~0xFFFULL;
 235         hpage_offset /= 4;
 236
 237         get_page(hpage);
 238         page = kmap_atomic(hpage, KM_USER0);
 239
 240         /* patch dcbz into reserved instruction, so we trap */
 241         for (i=hpage_offset; i < hpage_offset + (HW_PAGE_SIZE / 4); i++)
 242                 if ((page[i] & 0xff0007ff) == INS_DCBZ)
 243                         page[i] &= 0xfffffff7;
 244
 245         kunmap_atomic(page, KM_USER0);
 246         put_page(hpage);
 247 }
 248
 249 static int kvmppc_visible_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
 250 {
 251         ulong mp_pa = vcpu->arch.magic_page_pa;
 252
 253         if (unlikely(mp_pa) &&
 254             unlikely((mp_pa & KVM_PAM) >> PAGE_SHIFT == gfn)) {
 255                 return 1;
 256         }
 257
 258         return kvm_is_visible_gfn(vcpu->kvm, gfn);
 259 }
 260
 261 int kvmppc_handle_pagefault(struct kvm_run *run, struct kvm_vcpu *vcpu,
 262                             ulong eaddr, int vec)
 263 {
 264         bool data = (vec == BOOK3S_INTERRUPT_DATA_STORAGE);
 265         int r = RESUME_GUEST;
 266         int relocated;
 267         int page_found = 0;
 268         struct kvmppc_pte pte;
 269         bool is_mmio = false;
 270         bool dr = (vcpu->arch.shared->msr & MSR_DR) ? true : false;
 271         bool ir = (vcpu->arch.shared->msr & MSR_IR) ? true : false;
 272         u64 vsid;
 273
 274         relocated = data ? dr : ir;
 275
 276         /* Resolve real address if translation turned on */
 277         if (relocated) {
 278                 page_found = vcpu->arch.mmu.xlate(vcpu, eaddr, &pte, data);
 279         } else {
 280                 pte.may_execute = true;
 281                 pte.may_read = true;
 282                 pte.may_write = true;
 283                 pte.raddr = eaddr & KVM_PAM;
 284                 pte.eaddr = eaddr;
 285                 pte.vpage = eaddr >> 12;
 286         }
 287
 288         switch (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) {
 289         case 0:
 290                 pte.vpage |= ((u64)VSID_REAL << (SID_SHIFT - 12));
 291                 break;
 292         case MSR_DR:
 293         case MSR_IR:
 294                 vcpu->arch.mmu.esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid);
 295
 296                 if ((vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) == MSR_DR)
 297                         pte.vpage |= ((u64)VSID_REAL_DR << (SID_SHIFT - 12));
 298                 else
 299                         pte.vpage |= ((u64)VSID_REAL_IR << (SID_SHIFT - 12));
 300                 pte.vpage |= vsid;
 301
 302                 if (vsid == -1)
 303                         page_found = -EINVAL;
 304                 break;
 305         }
 306
 307         if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
 308            (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
 309                 /*
 310                  * If we do the dcbz hack, we have to NX on every execution,
 311                  * so we can patch the executing code. This renders our guest
 312                  * NX-less.
 313                  */
 314                 pte.may_execute = !data;
 315         }
 316
 317         if (page_found == -ENOENT) {
 318                 /* Page not found in guest PTE entries */
 319                 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 320                 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
 321                 vcpu->arch.shared->dsisr = svcpu->fault_dsisr;
 322                 vcpu->arch.shared->msr |=
 323                         (svcpu->shadow_srr1 & 0x00000000f8000000ULL);
 324                 svcpu_put(svcpu);
 325                 kvmppc_book3s_queue_irqprio(vcpu, vec);
 326         } else if (page_found == -EPERM) {
 327                 /* Storage protection */
 328                 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 329                 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
 330                 vcpu->arch.shared->dsisr = svcpu->fault_dsisr & ~DSISR_NOHPTE;
 331                 vcpu->arch.shared->dsisr |= DSISR_PROTFAULT;
 332                 vcpu->arch.shared->msr |=
 333                         svcpu->shadow_srr1 & 0x00000000f8000000ULL;
 334                 svcpu_put(svcpu);
 335                 kvmppc_book3s_queue_irqprio(vcpu, vec);
 336         } else if (page_found == -EINVAL) {
 337                 /* Page not found in guest SLB */
 338                 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
 339                 kvmppc_book3s_queue_irqprio(vcpu, vec + 0x80);
 340         } else if (!is_mmio &&
 341                    kvmppc_visible_gfn(vcpu, pte.raddr >> PAGE_SHIFT)) {
 342                 /* The guest's PTE is not mapped yet. Map on the host */
 343                 kvmppc_mmu_map_page(vcpu, &pte);
 344                 if (data)
 345                         vcpu->stat.sp_storage++;
 346                 else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
 347                         (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32)))
 348                         kvmppc_patch_dcbz(vcpu, &pte);
 349         } else {
 350                 /* MMIO */
 351                 vcpu->stat.mmio_exits++;
 352                 vcpu->arch.paddr_accessed = pte.raddr;
 353                 r = kvmppc_emulate_mmio(run, vcpu);
 354                 if ( r == RESUME_HOST_NV )
 355                         r = RESUME_HOST;
 356         }
 357
 358         return r;
 359 }
 360
 361 static inline int get_fpr_index(int i)
 362 {
 363 #ifdef CONFIG_VSX
 364         i *= 2;
 365 #endif
 366         return i;
 367 }
 368
 369 /* Give up external provider (FPU, Altivec, VSX) */
 370 void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr)
 371 {
 372         struct thread_struct *t = &current->thread;
 373         u64 *vcpu_fpr = vcpu->arch.fpr;
 374 #ifdef CONFIG_VSX
 375         u64 *vcpu_vsx = vcpu->arch.vsr;
 376 #endif
 377         u64 *thread_fpr = (u64*)t->fpr;
 378         int i;
 379
 380         if (!(vcpu->arch.guest_owned_ext & msr))
 381                 return;
 382
 383 #ifdef DEBUG_EXT
 384         printk(KERN_INFO "Giving up ext 0x%lx\n", msr);
 385 #endif
 386
 387         switch (msr) {
 388         case MSR_FP:
 389                 giveup_fpu(current);
 390                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++)
 391                         vcpu_fpr[i] = thread_fpr[get_fpr_index(i)];
 392
 393                 vcpu->arch.fpscr = t->fpscr.val;
 394                 break;
 395         case MSR_VEC:
 396 #ifdef CONFIG_ALTIVEC
 397                 giveup_altivec(current);
 398                 memcpy(vcpu->arch.vr, t->vr, sizeof(vcpu->arch.vr));
 399                 vcpu->arch.vscr = t->vscr;
 400 #endif
 401                 break;
 402         case MSR_VSX:
 403 #ifdef CONFIG_VSX
 404                 __giveup_vsx(current);
 405                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.vsr); i++)
 406                         vcpu_vsx[i] = thread_fpr[get_fpr_index(i) + 1];
 407 #endif
 408                 break;
 409         default:
 410                 BUG();
 411         }
 412
 413         vcpu->arch.guest_owned_ext &= ~msr;
 414         current->thread.regs->msr &= ~msr;
 415         kvmppc_recalc_shadow_msr(vcpu);
 416 }
 417
 418 static int kvmppc_read_inst(struct kvm_vcpu *vcpu)
 419 {
 420         ulong srr0 = kvmppc_get_pc(vcpu);
 421         u32 last_inst = kvmppc_get_last_inst(vcpu);
 422         int ret;
 423
 424         ret = kvmppc_ld(vcpu, &srr0, sizeof(u32), &last_inst, false);
 425         if (ret == -ENOENT) {
 426                 ulong msr = vcpu->arch.shared->msr;
 427
 428                 msr = kvmppc_set_field(msr, 33, 33, 1);
 429                 msr = kvmppc_set_field(msr, 34, 36, 0);
 430                 vcpu->arch.shared->msr = kvmppc_set_field(msr, 42, 47, 0);
 431                 kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_INST_STORAGE);
 432                 return EMULATE_AGAIN;
 433         }
 434
 435         return EMULATE_DONE;
 436 }
 437
 438 static int kvmppc_check_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr)
 439 {
 440
 441         /* Need to do paired single emulation? */
 442         if (!(vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE))
 443                 return EMULATE_DONE;
 444
 445         /* Read out the instruction */
 446         if (kvmppc_read_inst(vcpu) == EMULATE_DONE)
 447                 /* Need to emulate */
 448                 return EMULATE_FAIL;
 449
 450         return EMULATE_AGAIN;
 451 }
 452
 453 /* Handle external providers (FPU, Altivec, VSX) */
 454 static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
 455                              ulong msr)
 456 {
 457         struct thread_struct *t = &current->thread;
 458         u64 *vcpu_fpr = vcpu->arch.fpr;
 459 #ifdef CONFIG_VSX
 460         u64 *vcpu_vsx = vcpu->arch.vsr;
 461 #endif
 462         u64 *thread_fpr = (u64*)t->fpr;
 463         int i;
 464
 465         /* When we have paired singles, we emulate in software */
 466         if (vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE)
 467                 return RESUME_GUEST;
 468
 469         if (!(vcpu->arch.shared->msr & msr)) {
 470                 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 471                 return RESUME_GUEST;
 472         }
 473
 474         /* We already own the ext */
 475         if (vcpu->arch.guest_owned_ext & msr) {
 476                 return RESUME_GUEST;
 477         }
 478
 479 #ifdef DEBUG_EXT
 480         printk(KERN_INFO "Loading up ext 0x%lx\n", msr);
 481 #endif
 482
 483         current->thread.regs->msr |= msr;
 484
 485         switch (msr) {
 486         case MSR_FP:
 487                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++)
 488                         thread_fpr[get_fpr_index(i)] = vcpu_fpr[i];
 489
 490                 t->fpscr.val = vcpu->arch.fpscr;
 491                 t->fpexc_mode = 0;
 492                 kvmppc_load_up_fpu();
 493                 break;
 494         case MSR_VEC:
 495 #ifdef CONFIG_ALTIVEC
 496                 memcpy(t->vr, vcpu->arch.vr, sizeof(vcpu->arch.vr));
 497                 t->vscr = vcpu->arch.vscr;
 498                 t->vrsave = -1;
 499                 kvmppc_load_up_altivec();
 500 #endif
 501                 break;
 502         case MSR_VSX:
 503 #ifdef CONFIG_VSX
 504                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.vsr); i++)
 505                         thread_fpr[get_fpr_index(i) + 1] = vcpu_vsx[i];
 506                 kvmppc_load_up_vsx();
 507 #endif
 508                 break;
 509         default:
 510                 BUG();
 511         }
 512
 513         vcpu->arch.guest_owned_ext |= msr;
 514
 515         kvmppc_recalc_shadow_msr(vcpu);
 516
 517         return RESUME_GUEST;
 518 }
 519
 520 int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
 521                        unsigned int exit_nr)
 522 {
 523         int r = RESUME_HOST;
 524
 525         vcpu->stat.sum_exits++;
 526
 527         run->exit_reason = KVM_EXIT_UNKNOWN;
 528         run->ready_for_interrupt_injection = 1;
 529
 530         trace_kvm_book3s_exit(exit_nr, vcpu);
 531         preempt_enable();
 532         kvm_resched(vcpu);
 533         switch (exit_nr) {
 534         case BOOK3S_INTERRUPT_INST_STORAGE:
 535         {
 536                 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 537                 ulong shadow_srr1 = svcpu->shadow_srr1;
 538                 vcpu->stat.pf_instruc++;
 539
 540 #ifdef CONFIG_PPC_BOOK3S_32
 541                 /* We set segments as unused segments when invalidating them. So
 542                  * treat the respective fault as segment fault. */
 543                 if (svcpu->sr[kvmppc_get_pc(vcpu) >> SID_SHIFT] == SR_INVALID) {
 544                         kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
 545                         r = RESUME_GUEST;
 546                         svcpu_put(svcpu);
 547                         break;
 548                 }
 549 #endif
 550                 svcpu_put(svcpu);
 551
 552                 /* only care about PTEG not found errors, but leave NX alone */
 553                 if (shadow_srr1 & 0x40000000) {
 554                         r = kvmppc_handle_pagefault(run, vcpu, kvmppc_get_pc(vcpu), exit_nr);
 555                         vcpu->stat.sp_instruc++;
 556                 } else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
 557                           (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
 558                         /*
 559                          * XXX If we do the dcbz hack we use the NX bit to flush&patch the page,
 560                          *     so we can't use the NX bit inside the guest. Let's cross our fingers,
 561                          *     that no guest that needs the dcbz hack does NX.
 562                          */
 563                         kvmppc_mmu_pte_flush(vcpu, kvmppc_get_pc(vcpu), ~0xFFFUL);
 564                         r = RESUME_GUEST;
 565                 } else {
 566                         vcpu->arch.shared->msr |= shadow_srr1 & 0x58000000;
 567                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 568                         r = RESUME_GUEST;
 569                 }
 570                 break;
 571         }
 572         case BOOK3S_INTERRUPT_DATA_STORAGE:
 573         {
 574                 ulong dar = kvmppc_get_fault_dar(vcpu);
 575                 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 576                 u32 fault_dsisr = svcpu->fault_dsisr;
 577                 vcpu->stat.pf_storage++;
 578
 579 #ifdef CONFIG_PPC_BOOK3S_32
 580                 /* We set segments as unused segments when invalidating them. So
 581                  * treat the respective fault as segment fault. */
 582                 if ((svcpu->sr[dar >> SID_SHIFT]) == SR_INVALID) {
 583                         kvmppc_mmu_map_segment(vcpu, dar);
 584                         r = RESUME_GUEST;
 585                         svcpu_put(svcpu);
 586                         break;
 587                 }
 588 #endif
 589                 svcpu_put(svcpu);
 590
 591                 /* The only case we need to handle is missing shadow PTEs */
 592                 if (fault_dsisr & DSISR_NOHPTE) {
 593                         r = kvmppc_handle_pagefault(run, vcpu, dar, exit_nr);
 594                 } else {
 595                         vcpu->arch.shared->dar = dar;
 596                         vcpu->arch.shared->dsisr = fault_dsisr;
 597                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 598                         r = RESUME_GUEST;
 599                 }
 600                 break;
 601         }
 602         case BOOK3S_INTERRUPT_DATA_SEGMENT:
 603                 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_fault_dar(vcpu)) < 0) {
 604                         vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
 605                         kvmppc_book3s_queue_irqprio(vcpu,
 606                                 BOOK3S_INTERRUPT_DATA_SEGMENT);
 607                 }
 608                 r = RESUME_GUEST;
 609                 break;
 610         case BOOK3S_INTERRUPT_INST_SEGMENT:
 611                 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu)) < 0) {
 612                         kvmppc_book3s_queue_irqprio(vcpu,
 613                                 BOOK3S_INTERRUPT_INST_SEGMENT);
 614                 }
 615                 r = RESUME_GUEST;
 616                 break;
 617         /* We're good on these - the host merely wanted to get our attention */
 618         case BOOK3S_INTERRUPT_DECREMENTER:
 619                 vcpu->stat.dec_exits++;
 620                 r = RESUME_GUEST;
 621                 break;
 622         case BOOK3S_INTERRUPT_EXTERNAL:
 623                 vcpu->stat.ext_intr_exits++;
 624                 r = RESUME_GUEST;
 625                 break;
 626         case BOOK3S_INTERRUPT_PERFMON:
 627                 r = RESUME_GUEST;
 628                 break;
 629         case BOOK3S_INTERRUPT_PROGRAM:
 630         {
 631                 enum emulation_result er;
 632                 struct kvmppc_book3s_shadow_vcpu *svcpu;
 633                 ulong flags;
 634
 635 program_interrupt:
 636                 svcpu = svcpu_get(vcpu);
 637                 flags = svcpu->shadow_srr1 & 0x1f0000ull;
 638                 svcpu_put(svcpu);
 639
 640                 if (vcpu->arch.shared->msr & MSR_PR) {
 641 #ifdef EXIT_DEBUG
 642                         printk(KERN_INFO "Userspace triggered 0x700 exception at 0x%lx (0x%x)\n", kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu));
 643 #endif
 644                         if ((kvmppc_get_last_inst(vcpu) & 0xff0007ff) !=
 645                             (INS_DCBZ & 0xfffffff7)) {
 646                                 kvmppc_core_queue_program(vcpu, flags);
 647                                 r = RESUME_GUEST;
 648                                 break;
 649                         }
 650                 }
 651
 652                 vcpu->stat.emulated_inst_exits++;
 653                 er = kvmppc_emulate_instruction(run, vcpu);
 654                 switch (er) {
 655                 case EMULATE_DONE:
 656                         r = RESUME_GUEST_NV;
 657                         break;
 658                 case EMULATE_AGAIN:
 659                         r = RESUME_GUEST;
 660                         break;
 661                 case EMULATE_FAIL:
 662                         printk(KERN_CRIT "%s: emulation at %lx failed (%08x)\n",
 663                                __func__, kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu));
 664                         kvmppc_core_queue_program(vcpu, flags);
 665                         r = RESUME_GUEST;
 666                         break;
 667                 case EMULATE_DO_MMIO:
 668                         run->exit_reason = KVM_EXIT_MMIO;
 669                         r = RESUME_HOST_NV;
 670                         break;
 671                 default:
 672                         BUG();
 673                 }
 674                 break;
 675         }
 676         case BOOK3S_INTERRUPT_SYSCALL:
 677                 if (vcpu->arch.papr_enabled &&
 678                     (kvmppc_get_last_inst(vcpu) == 0x44000022) &&
 679                     !(vcpu->arch.shared->msr & MSR_PR)) {
 680                         /* SC 1 papr hypercalls */
 681                         ulong cmd = kvmppc_get_gpr(vcpu, 3);
 682                         int i;
 683
 684 #ifdef CONFIG_KVM_BOOK3S_64_PR
 685                         if (kvmppc_h_pr(vcpu, cmd) == EMULATE_DONE) {
 686                                 r = RESUME_GUEST;
 687                                 break;
 688                         }
 689 #endif
 690
 691                         run->papr_hcall.nr = cmd;
 692                         for (i = 0; i < 9; ++i) {
 693                                 ulong gpr = kvmppc_get_gpr(vcpu, 4 + i);
 694                                 run->papr_hcall.args[i] = gpr;
 695                         }
 696                         run->exit_reason = KVM_EXIT_PAPR_HCALL;
 697                         vcpu->arch.hcall_needed = 1;
 698                         r = RESUME_HOST;
 699                 } else if (vcpu->arch.osi_enabled &&
 700                     (((u32)kvmppc_get_gpr(vcpu, 3)) == OSI_SC_MAGIC_R3) &&
 701                     (((u32)kvmppc_get_gpr(vcpu, 4)) == OSI_SC_MAGIC_R4)) {
 702                         /* MOL hypercalls */
 703                         u64 *gprs = run->osi.gprs;
 704                         int i;
 705
 706                         run->exit_reason = KVM_EXIT_OSI;
 707                         for (i = 0; i < 32; i++)
 708                                 gprs[i] = kvmppc_get_gpr(vcpu, i);
 709                         vcpu->arch.osi_needed = 1;
 710                         r = RESUME_HOST_NV;
 711                 } else if (!(vcpu->arch.shared->msr & MSR_PR) &&
 712                     (((u32)kvmppc_get_gpr(vcpu, 0)) == KVM_SC_MAGIC_R0)) {
 713                         /* KVM PV hypercalls */
 714                         kvmppc_set_gpr(vcpu, 3, kvmppc_kvm_pv(vcpu));
 715                         r = RESUME_GUEST;
 716                 } else {
 717                         /* Guest syscalls */
 718                         vcpu->stat.syscall_exits++;
 719                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 720                         r = RESUME_GUEST;
 721                 }
 722                 break;
 723         case BOOK3S_INTERRUPT_FP_UNAVAIL:
 724         case BOOK3S_INTERRUPT_ALTIVEC:
 725         case BOOK3S_INTERRUPT_VSX:
 726         {
 727                 int ext_msr = 0;
 728
 729                 switch (exit_nr) {
 730                 case BOOK3S_INTERRUPT_FP_UNAVAIL: ext_msr = MSR_FP;  break;
 731                 case BOOK3S_INTERRUPT_ALTIVEC:    ext_msr = MSR_VEC; break;
 732                 case BOOK3S_INTERRUPT_VSX:        ext_msr = MSR_VSX; break;
 733                 }
 734
 735                 switch (kvmppc_check_ext(vcpu, exit_nr)) {
 736                 case EMULATE_DONE:
 737                         /* everything ok - let's enable the ext */
 738                         r = kvmppc_handle_ext(vcpu, exit_nr, ext_msr);
 739                         break;
 740                 case EMULATE_FAIL:
 741                         /* we need to emulate this instruction */
 742                         goto program_interrupt;
 743                         break;
 744                 default:
 745                         /* nothing to worry about - go again */
 746                         break;
 747                 }
 748                 break;
 749         }
 750         case BOOK3S_INTERRUPT_ALIGNMENT:
 751                 if (kvmppc_read_inst(vcpu) == EMULATE_DONE) {
 752                         vcpu->arch.shared->dsisr = kvmppc_alignment_dsisr(vcpu,
 753                                 kvmppc_get_last_inst(vcpu));
 754                         vcpu->arch.shared->dar = kvmppc_alignment_dar(vcpu,
 755                                 kvmppc_get_last_inst(vcpu));
 756                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 757                 }
 758                 r = RESUME_GUEST;
 759                 break;
 760         case BOOK3S_INTERRUPT_MACHINE_CHECK:
 761         case BOOK3S_INTERRUPT_TRACE:
 762                 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 763                 r = RESUME_GUEST;
 764                 break;
 765         default:
 766         {
 767                 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 768                 ulong shadow_srr1 = svcpu->shadow_srr1;
 769                 svcpu_put(svcpu);
 770                 /* Ugh - bork here! What did we get? */
 771                 printk(KERN_EMERG "exit_nr=0x%x | pc=0x%lx | msr=0x%lx\n",
 772                         exit_nr, kvmppc_get_pc(vcpu), shadow_srr1);
 773                 r = RESUME_HOST;
 774                 BUG();
 775                 break;
 776         }
 777         }
 778
 779         if (!(r & RESUME_HOST)) {
 780                 /* To avoid clobbering exit_reason, only check for signals if
 781                  * we aren't already exiting to userspace for some other
 782                  * reason. */
 783
 784                 /*
 785                  * Interrupts could be timers for the guest which we have to
 786                  * inject again, so let's postpone them until we're in the guest
 787                  * and if we really did time things so badly, then we just exit
 788                  * again due to a host external interrupt.
 789                  */
 790                 __hard_irq_disable();
 791                 if (signal_pending(current)) {
 792                         __hard_irq_enable();
 793 #ifdef EXIT_DEBUG
 794                         printk(KERN_EMERG "KVM: Going back to host\n");
 795 #endif
 796                         vcpu->stat.signal_exits++;
 797                         run->exit_reason = KVM_EXIT_INTR;
 798                         r = -EINTR;
 799                 } else {
 800                         preempt_disable();
 801
 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 = put_user(to_book3s(vcpu)->hior, (u64 __user *)reg->addr);
 884                 break;
 885         default:
 886                 break;
 887         }
 888
 889         return r;
 890 }
 891
 892 int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
 893 {
 894         int r = -EINVAL;
 895
 896         switch (reg->id) {
 897         case KVM_REG_PPC_HIOR:
 898                 r = get_user(to_book3s(vcpu)->hior, (u64 __user *)reg->addr);
 899                 if (!r)
 900                         to_book3s(vcpu)->hior_explicit = true;
 901                 break;
 902         default:
 903                 break;
 904         }
 905
 906         return r;
 907 }
 908
 909 int kvmppc_core_check_processor_compat(void)
 910 {
 911         return 0;
 912 }
 913
 914 struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
 915 {
 916         struct kvmppc_vcpu_book3s *vcpu_book3s;
 917         struct kvm_vcpu *vcpu;
 918         int err = -ENOMEM;
 919         unsigned long p;
 920
 921         vcpu_book3s = vzalloc(sizeof(struct kvmppc_vcpu_book3s));
 922         if (!vcpu_book3s)
 923                 goto out;
 924
 925         vcpu_book3s->shadow_vcpu = (struct kvmppc_book3s_shadow_vcpu *)
 926                 kzalloc(sizeof(*vcpu_book3s->shadow_vcpu), GFP_KERNEL);
 927         if (!vcpu_book3s->shadow_vcpu)
 928                 goto free_vcpu;
 929
 930         vcpu = &vcpu_book3s->vcpu;
 931         err = kvm_vcpu_init(vcpu, kvm, id);
 932         if (err)
 933                 goto free_shadow_vcpu;
 934
 935         p = __get_free_page(GFP_KERNEL|__GFP_ZERO);
 936         /* the real shared page fills the last 4k of our page */
 937         vcpu->arch.shared = (void*)(p + PAGE_SIZE - 4096);
 938         if (!p)
 939                 goto uninit_vcpu;
 940
 941 #ifdef CONFIG_PPC_BOOK3S_64
 942         /* default to book3s_64 (970fx) */
 943         vcpu->arch.pvr = 0x3C0301;
 944 #else
 945         /* default to book3s_32 (750) */
 946         vcpu->arch.pvr = 0x84202;
 947 #endif
 948         kvmppc_set_pvr(vcpu, vcpu->arch.pvr);
 949         vcpu->arch.slb_nr = 64;
 950
 951         vcpu->arch.shadow_msr = MSR_USER64;
 952
 953         err = kvmppc_mmu_init(vcpu);
 954         if (err < 0)
 955                 goto uninit_vcpu;
 956
 957         return vcpu;
 958
 959 uninit_vcpu:
 960         kvm_vcpu_uninit(vcpu);
 961 free_shadow_vcpu:
 962         kfree(vcpu_book3s->shadow_vcpu);
 963 free_vcpu:
 964         vfree(vcpu_book3s);
 965 out:
 966         return ERR_PTR(err);
 967 }
 968
 969 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
 970 {
 971         struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
 972
 973         free_page((unsigned long)vcpu->arch.shared & PAGE_MASK);
 974         kvm_vcpu_uninit(vcpu);
 975         kfree(vcpu_book3s->shadow_vcpu);
 976         vfree(vcpu_book3s);
 977 }
 978
 979 int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
 980 {
 981         int ret;
 982         double fpr[32][TS_FPRWIDTH];
 983         unsigned int fpscr;
 984         int fpexc_mode;
 985 #ifdef CONFIG_ALTIVEC
 986         vector128 vr[32];
 987         vector128 vscr;
 988         unsigned long uninitialized_var(vrsave);
 989         int used_vr;
 990 #endif
 991 #ifdef CONFIG_VSX
 992         int used_vsr;
 993 #endif
 994         ulong ext_msr;
 995
 996         preempt_disable();
 997
 998         /* Check if we can run the vcpu at all */
 999         if (!vcpu->arch.sane) {
1000                 kvm_run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1001                 ret = -EINVAL;
1002                 goto out;
1003         }
1004
1005         kvmppc_core_prepare_to_enter(vcpu);
1006
1007         /*
1008          * Interrupts could be timers for the guest which we have to inject
1009          * again, so let's postpone them until we're in the guest and if we
1010          * really did time things so badly, then we just exit again due to
1011          * a host external interrupt.
1012          */
1013         __hard_irq_disable();
1014
1015         /* No need to go into the guest when all we do is going out */
1016         if (signal_pending(current)) {
1017                 __hard_irq_enable();
1018                 kvm_run->exit_reason = KVM_EXIT_INTR;
1019                 ret = -EINTR;
1020                 goto out;
1021         }
1022
1023         /* Save FPU state in stack */
1024         if (current->thread.regs->msr & MSR_FP)
1025                 giveup_fpu(current);
1026         memcpy(fpr, current->thread.fpr, sizeof(current->thread.fpr));
1027         fpscr = current->thread.fpscr.val;
1028         fpexc_mode = current->thread.fpexc_mode;
1029
1030 #ifdef CONFIG_ALTIVEC
1031         /* Save Altivec state in stack */
1032         used_vr = current->thread.used_vr;
1033         if (used_vr) {
1034                 if (current->thread.regs->msr & MSR_VEC)
1035                         giveup_altivec(current);
1036                 memcpy(vr, current->thread.vr, sizeof(current->thread.vr));
1037                 vscr = current->thread.vscr;
1038                 vrsave = current->thread.vrsave;
1039         }
1040 #endif
1041
1042 #ifdef CONFIG_VSX
1043         /* Save VSX state in stack */
1044         used_vsr = current->thread.used_vsr;
1045         if (used_vsr && (current->thread.regs->msr & MSR_VSX))
1046                         __giveup_vsx(current);
1047 #endif
1048
1049         /* Remember the MSR with disabled extensions */
1050         ext_msr = current->thread.regs->msr;
1051
1052         /* Preload FPU if it's enabled */
1053         if (vcpu->arch.shared->msr & MSR_FP)
1054                 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
1055
1056         kvm_guest_enter();
1057
1058         ret = __kvmppc_vcpu_run(kvm_run, vcpu);
1059
1060         kvm_guest_exit();
1061
1062         current->thread.regs->msr = ext_msr;
1063
1064         /* Make sure we save the guest FPU/Altivec/VSX state */
1065         kvmppc_giveup_ext(vcpu, MSR_FP);
1066         kvmppc_giveup_ext(vcpu, MSR_VEC);
1067         kvmppc_giveup_ext(vcpu, MSR_VSX);
1068
1069         /* Restore FPU state from stack */
1070         memcpy(current->thread.fpr, fpr, sizeof(current->thread.fpr));
1071         current->thread.fpscr.val = fpscr;
1072         current->thread.fpexc_mode = fpexc_mode;
1073
1074 #ifdef CONFIG_ALTIVEC
1075         /* Restore Altivec state from stack */
1076         if (used_vr && current->thread.used_vr) {
1077                 memcpy(current->thread.vr, vr, sizeof(current->thread.vr));
1078                 current->thread.vscr = vscr;
1079                 current->thread.vrsave = vrsave;
1080         }
1081         current->thread.used_vr = used_vr;
1082 #endif
1083
1084 #ifdef CONFIG_VSX
1085         current->thread.used_vsr = used_vsr;
1086 #endif
1087
1088 out:
1089         preempt_enable();
1090         return ret;
1091 }
1092
1093 /*
1094  * Get (and clear) the dirty memory log for a memory slot.
1095  */
1096 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
1097                                       struct kvm_dirty_log *log)
1098 {
1099         struct kvm_memory_slot *memslot;
1100         struct kvm_vcpu *vcpu;
1101         ulong ga, ga_end;
1102         int is_dirty = 0;
1103         int r;
1104         unsigned long n;
1105
1106         mutex_lock(&kvm->slots_lock);
1107
1108         r = kvm_get_dirty_log(kvm, log, &is_dirty);
1109         if (r)
1110                 goto out;
1111
1112         /* If nothing is dirty, don't bother messing with page tables. */
1113         if (is_dirty) {
1114                 memslot = id_to_memslot(kvm->memslots, log->slot);
1115
1116                 ga = memslot->base_gfn << PAGE_SHIFT;
1117                 ga_end = ga + (memslot->npages << PAGE_SHIFT);
1118
1119                 kvm_for_each_vcpu(n, vcpu, kvm)
1120                         kvmppc_mmu_pte_pflush(vcpu, ga, ga_end);
1121
1122                 n = kvm_dirty_bitmap_bytes(memslot);
1123                 memset(memslot->dirty_bitmap, 0, n);
1124         }
1125
1126         r = 0;
1127 out:
1128         mutex_unlock(&kvm->slots_lock);
1129         return r;
1130 }
1131
1132 int kvmppc_core_prepare_memory_region(struct kvm *kvm,
1133                                       struct kvm_userspace_memory_region *mem)
1134 {
1135         return 0;
1136 }
1137
1138 void kvmppc_core_commit_memory_region(struct kvm *kvm,
1139                                 struct kvm_userspace_memory_region *mem)
1140 {
1141 }
1142
1143 int kvmppc_core_init_vm(struct kvm *kvm)
1144 {
1145         return 0;
1146 }
1147
1148 void kvmppc_core_destroy_vm(struct kvm *kvm)
1149 {
1150 }
1151
1152 static int kvmppc_book3s_init(void)
1153 {
1154         int r;
1155
1156         r = kvm_init(NULL, sizeof(struct kvmppc_vcpu_book3s), 0,
1157                      THIS_MODULE);
1158
1159         if (r)
1160                 return r;
1161
1162         r = kvmppc_mmu_hpte_sysinit();
1163
1164         return r;
1165 }
1166
1167 static void kvmppc_book3s_exit(void)
1168 {
1169         kvmppc_mmu_hpte_sysexit();
1170         kvm_exit();
1171 }
1172
1173 module_init(kvmppc_book3s_init);
1174 module_exit(kvmppc_book3s_exit);