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                         clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
 124                         vcpu->stat.halt_wakeup++;
 125
 126                         /* Unset POW bit after we woke up */
 127                         msr &= ~MSR_POW;
 128                         vcpu->arch.shared->msr = msr;
 129                 }
 130         }
 131
 132         if ((vcpu->arch.shared->msr & (MSR_PR|MSR_IR|MSR_DR)) !=
 133                    (old_msr & (MSR_PR|MSR_IR|MSR_DR))) {
 134                 kvmppc_mmu_flush_segments(vcpu);
 135                 kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
 136
 137                 /* Preload magic page segment when in kernel mode */
 138                 if (!(msr & MSR_PR) && vcpu->arch.magic_page_pa) {
 139                         struct kvm_vcpu_arch *a = &vcpu->arch;
 140
 141                         if (msr & MSR_DR)
 142                                 kvmppc_mmu_map_segment(vcpu, a->magic_page_ea);
 143                         else
 144                                 kvmppc_mmu_map_segment(vcpu, a->magic_page_pa);
 145                 }
 146         }
 147
 148         /*
 149          * When switching from 32 to 64-bit, we may have a stale 32-bit
 150          * magic page around, we need to flush it. Typically 32-bit magic
 151          * page will be instanciated when calling into RTAS. Note: We
 152          * assume that such transition only happens while in kernel mode,
 153          * ie, we never transition from user 32-bit to kernel 64-bit with
 154          * a 32-bit magic page around.
 155          */
 156         if (vcpu->arch.magic_page_pa &&
 157             !(old_msr & MSR_PR) && !(old_msr & MSR_SF) && (msr & MSR_SF)) {
 158                 /* going from RTAS to normal kernel code */
 159                 kvmppc_mmu_pte_flush(vcpu, (uint32_t)vcpu->arch.magic_page_pa,
 160                                      ~0xFFFUL);
 161         }
 162
 163         /* Preload FPU if it's enabled */
 164         if (vcpu->arch.shared->msr & MSR_FP)
 165                 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
 166 }
 167
 168 void kvmppc_set_pvr(struct kvm_vcpu *vcpu, u32 pvr)
 169 {
 170         u32 host_pvr;
 171
 172         vcpu->arch.hflags &= ~BOOK3S_HFLAG_SLB;
 173         vcpu->arch.pvr = pvr;
 174 #ifdef CONFIG_PPC_BOOK3S_64
 175         if ((pvr >= 0x330000) && (pvr < 0x70330000)) {
 176                 kvmppc_mmu_book3s_64_init(vcpu);
 177                 if (!to_book3s(vcpu)->hior_explicit)
 178                         to_book3s(vcpu)->hior = 0xfff00000;
 179                 to_book3s(vcpu)->msr_mask = 0xffffffffffffffffULL;
 180                 vcpu->arch.cpu_type = KVM_CPU_3S_64;
 181         } else
 182 #endif
 183         {
 184                 kvmppc_mmu_book3s_32_init(vcpu);
 185                 if (!to_book3s(vcpu)->hior_explicit)
 186                         to_book3s(vcpu)->hior = 0;
 187                 to_book3s(vcpu)->msr_mask = 0xffffffffULL;
 188                 vcpu->arch.cpu_type = KVM_CPU_3S_32;
 189         }
 190
 191         kvmppc_sanity_check(vcpu);
 192
 193         /* If we are in hypervisor level on 970, we can tell the CPU to
 194          * treat DCBZ as 32 bytes store */
 195         vcpu->arch.hflags &= ~BOOK3S_HFLAG_DCBZ32;
 196         if (vcpu->arch.mmu.is_dcbz32(vcpu) && (mfmsr() & MSR_HV) &&
 197             !strcmp(cur_cpu_spec->platform, "ppc970"))
 198                 vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
 199
 200         /* Cell performs badly if MSR_FEx are set. So let's hope nobody
 201            really needs them in a VM on Cell and force disable them. */
 202         if (!strcmp(cur_cpu_spec->platform, "ppc-cell-be"))
 203                 to_book3s(vcpu)->msr_mask &= ~(MSR_FE0 | MSR_FE1);
 204
 205 #ifdef CONFIG_PPC_BOOK3S_32
 206         /* 32 bit Book3S always has 32 byte dcbz */
 207         vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
 208 #endif
 209
 210         /* On some CPUs we can execute paired single operations natively */
 211         asm ( "mfpvr %0" : "=r"(host_pvr));
 212         switch (host_pvr) {
 213         case 0x00080200:        /* lonestar 2.0 */
 214         case 0x00088202:        /* lonestar 2.2 */
 215         case 0x70000100:        /* gekko 1.0 */
 216         case 0x00080100:        /* gekko 2.0 */
 217         case 0x00083203:        /* gekko 2.3a */
 218         case 0x00083213:        /* gekko 2.3b */
 219         case 0x00083204:        /* gekko 2.4 */
 220         case 0x00083214:        /* gekko 2.4e (8SE) - retail HW2 */
 221         case 0x00087200:        /* broadway */
 222                 vcpu->arch.hflags |= BOOK3S_HFLAG_NATIVE_PS;
 223                 /* Enable HID2.PSE - in case we need it later */
 224                 mtspr(SPRN_HID2_GEKKO, mfspr(SPRN_HID2_GEKKO) | (1 << 29));
 225         }
 226 }
 227
 228 /* Book3s_32 CPUs always have 32 bytes cache line size, which Linux assumes. To
 229  * make Book3s_32 Linux work on Book3s_64, we have to make sure we trap dcbz to
 230  * emulate 32 bytes dcbz length.
 231  *
 232  * The Book3s_64 inventors also realized this case and implemented a special bit
 233  * in the HID5 register, which is a hypervisor ressource. Thus we can't use it.
 234  *
 235  * My approach here is to patch the dcbz instruction on executing pages.
 236  */
 237 static void kvmppc_patch_dcbz(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
 238 {
 239         struct page *hpage;
 240         u64 hpage_offset;
 241         u32 *page;
 242         int i;
 243
 244         hpage = gfn_to_page(vcpu->kvm, pte->raddr >> PAGE_SHIFT);
 245         if (is_error_page(hpage)) {
 246                 kvm_release_page_clean(hpage);
 247                 return;
 248         }
 249
 250         hpage_offset = pte->raddr & ~PAGE_MASK;
 251         hpage_offset &= ~0xFFFULL;
 252         hpage_offset /= 4;
 253
 254         get_page(hpage);
 255         page = kmap_atomic(hpage);
 256
 257         /* patch dcbz into reserved instruction, so we trap */
 258         for (i=hpage_offset; i < hpage_offset + (HW_PAGE_SIZE / 4); i++)
 259                 if ((page[i] & 0xff0007ff) == INS_DCBZ)
 260                         page[i] &= 0xfffffff7;
 261
 262         kunmap_atomic(page);
 263         put_page(hpage);
 264 }
 265
 266 static int kvmppc_visible_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
 267 {
 268         ulong mp_pa = vcpu->arch.magic_page_pa;
 269
 270         if (!(vcpu->arch.shared->msr & MSR_SF))
 271                 mp_pa = (uint32_t)mp_pa;
 272
 273         if (unlikely(mp_pa) &&
 274             unlikely((mp_pa & KVM_PAM) >> PAGE_SHIFT == gfn)) {
 275                 return 1;
 276         }
 277
 278         return kvm_is_visible_gfn(vcpu->kvm, gfn);
 279 }
 280
 281 int kvmppc_handle_pagefault(struct kvm_run *run, struct kvm_vcpu *vcpu,
 282                             ulong eaddr, int vec)
 283 {
 284         bool data = (vec == BOOK3S_INTERRUPT_DATA_STORAGE);
 285         int r = RESUME_GUEST;
 286         int relocated;
 287         int page_found = 0;
 288         struct kvmppc_pte pte;
 289         bool is_mmio = false;
 290         bool dr = (vcpu->arch.shared->msr & MSR_DR) ? true : false;
 291         bool ir = (vcpu->arch.shared->msr & MSR_IR) ? true : false;
 292         u64 vsid;
 293
 294         relocated = data ? dr : ir;
 295
 296         /* Resolve real address if translation turned on */
 297         if (relocated) {
 298                 page_found = vcpu->arch.mmu.xlate(vcpu, eaddr, &pte, data);
 299         } else {
 300                 pte.may_execute = true;
 301                 pte.may_read = true;
 302                 pte.may_write = true;
 303                 pte.raddr = eaddr & KVM_PAM;
 304                 pte.eaddr = eaddr;
 305                 pte.vpage = eaddr >> 12;
 306         }
 307
 308         switch (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) {
 309         case 0:
 310                 pte.vpage |= ((u64)VSID_REAL << (SID_SHIFT - 12));
 311                 break;
 312         case MSR_DR:
 313         case MSR_IR:
 314                 vcpu->arch.mmu.esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid);
 315
 316                 if ((vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) == MSR_DR)
 317                         pte.vpage |= ((u64)VSID_REAL_DR << (SID_SHIFT - 12));
 318                 else
 319                         pte.vpage |= ((u64)VSID_REAL_IR << (SID_SHIFT - 12));
 320                 pte.vpage |= vsid;
 321
 322                 if (vsid == -1)
 323                         page_found = -EINVAL;
 324                 break;
 325         }
 326
 327         if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
 328            (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
 329                 /*
 330                  * If we do the dcbz hack, we have to NX on every execution,
 331                  * so we can patch the executing code. This renders our guest
 332                  * NX-less.
 333                  */
 334                 pte.may_execute = !data;
 335         }
 336
 337         if (page_found == -ENOENT) {
 338                 /* Page not found in guest PTE entries */
 339                 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 340                 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
 341                 vcpu->arch.shared->dsisr = svcpu->fault_dsisr;
 342                 vcpu->arch.shared->msr |=
 343                         (svcpu->shadow_srr1 & 0x00000000f8000000ULL);
 344                 svcpu_put(svcpu);
 345                 kvmppc_book3s_queue_irqprio(vcpu, vec);
 346         } else if (page_found == -EPERM) {
 347                 /* Storage protection */
 348                 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 349                 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
 350                 vcpu->arch.shared->dsisr = svcpu->fault_dsisr & ~DSISR_NOHPTE;
 351                 vcpu->arch.shared->dsisr |= DSISR_PROTFAULT;
 352                 vcpu->arch.shared->msr |=
 353                         svcpu->shadow_srr1 & 0x00000000f8000000ULL;
 354                 svcpu_put(svcpu);
 355                 kvmppc_book3s_queue_irqprio(vcpu, vec);
 356         } else if (page_found == -EINVAL) {
 357                 /* Page not found in guest SLB */
 358                 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
 359                 kvmppc_book3s_queue_irqprio(vcpu, vec + 0x80);
 360         } else if (!is_mmio &&
 361                    kvmppc_visible_gfn(vcpu, pte.raddr >> PAGE_SHIFT)) {
 362                 /* The guest's PTE is not mapped yet. Map on the host */
 363                 kvmppc_mmu_map_page(vcpu, &pte);
 364                 if (data)
 365                         vcpu->stat.sp_storage++;
 366                 else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
 367                         (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32)))
 368                         kvmppc_patch_dcbz(vcpu, &pte);
 369         } else {
 370                 /* MMIO */
 371                 vcpu->stat.mmio_exits++;
 372                 vcpu->arch.paddr_accessed = pte.raddr;
 373                 vcpu->arch.vaddr_accessed = pte.eaddr;
 374                 r = kvmppc_emulate_mmio(run, vcpu);
 375                 if ( r == RESUME_HOST_NV )
 376                         r = RESUME_HOST;
 377         }
 378
 379         return r;
 380 }
 381
 382 static inline int get_fpr_index(int i)
 383 {
 384 #ifdef CONFIG_VSX
 385         i *= 2;
 386 #endif
 387         return i;
 388 }
 389
 390 /* Give up external provider (FPU, Altivec, VSX) */
 391 void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr)
 392 {
 393         struct thread_struct *t = &current->thread;
 394         u64 *vcpu_fpr = vcpu->arch.fpr;
 395 #ifdef CONFIG_VSX
 396         u64 *vcpu_vsx = vcpu->arch.vsr;
 397 #endif
 398         u64 *thread_fpr = (u64*)t->fpr;
 399         int i;
 400
 401         if (!(vcpu->arch.guest_owned_ext & msr))
 402                 return;
 403
 404 #ifdef DEBUG_EXT
 405         printk(KERN_INFO "Giving up ext 0x%lx\n", msr);
 406 #endif
 407
 408         switch (msr) {
 409         case MSR_FP:
 410                 giveup_fpu(current);
 411                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++)
 412                         vcpu_fpr[i] = thread_fpr[get_fpr_index(i)];
 413
 414                 vcpu->arch.fpscr = t->fpscr.val;
 415                 break;
 416         case MSR_VEC:
 417 #ifdef CONFIG_ALTIVEC
 418                 giveup_altivec(current);
 419                 memcpy(vcpu->arch.vr, t->vr, sizeof(vcpu->arch.vr));
 420                 vcpu->arch.vscr = t->vscr;
 421 #endif
 422                 break;
 423         case MSR_VSX:
 424 #ifdef CONFIG_VSX
 425                 __giveup_vsx(current);
 426                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.vsr); i++)
 427                         vcpu_vsx[i] = thread_fpr[get_fpr_index(i) + 1];
 428 #endif
 429                 break;
 430         default:
 431                 BUG();
 432         }
 433
 434         vcpu->arch.guest_owned_ext &= ~msr;
 435         current->thread.regs->msr &= ~msr;
 436         kvmppc_recalc_shadow_msr(vcpu);
 437 }
 438
 439 static int kvmppc_read_inst(struct kvm_vcpu *vcpu)
 440 {
 441         ulong srr0 = kvmppc_get_pc(vcpu);
 442         u32 last_inst = kvmppc_get_last_inst(vcpu);
 443         int ret;
 444
 445         ret = kvmppc_ld(vcpu, &srr0, sizeof(u32), &last_inst, false);
 446         if (ret == -ENOENT) {
 447                 ulong msr = vcpu->arch.shared->msr;
 448
 449                 msr = kvmppc_set_field(msr, 33, 33, 1);
 450                 msr = kvmppc_set_field(msr, 34, 36, 0);
 451                 vcpu->arch.shared->msr = kvmppc_set_field(msr, 42, 47, 0);
 452                 kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_INST_STORAGE);
 453                 return EMULATE_AGAIN;
 454         }
 455
 456         return EMULATE_DONE;
 457 }
 458
 459 static int kvmppc_check_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr)
 460 {
 461
 462         /* Need to do paired single emulation? */
 463         if (!(vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE))
 464                 return EMULATE_DONE;
 465
 466         /* Read out the instruction */
 467         if (kvmppc_read_inst(vcpu) == EMULATE_DONE)
 468                 /* Need to emulate */
 469                 return EMULATE_FAIL;
 470
 471         return EMULATE_AGAIN;
 472 }
 473
 474 /* Handle external providers (FPU, Altivec, VSX) */
 475 static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
 476                              ulong msr)
 477 {
 478         struct thread_struct *t = &current->thread;
 479         u64 *vcpu_fpr = vcpu->arch.fpr;
 480 #ifdef CONFIG_VSX
 481         u64 *vcpu_vsx = vcpu->arch.vsr;
 482 #endif
 483         u64 *thread_fpr = (u64*)t->fpr;
 484         int i;
 485
 486         /* When we have paired singles, we emulate in software */
 487         if (vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE)
 488                 return RESUME_GUEST;
 489
 490         if (!(vcpu->arch.shared->msr & msr)) {
 491                 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 492                 return RESUME_GUEST;
 493         }
 494
 495         /* We already own the ext */
 496         if (vcpu->arch.guest_owned_ext & msr) {
 497                 return RESUME_GUEST;
 498         }
 499
 500 #ifdef DEBUG_EXT
 501         printk(KERN_INFO "Loading up ext 0x%lx\n", msr);
 502 #endif
 503
 504         current->thread.regs->msr |= msr;
 505
 506         switch (msr) {
 507         case MSR_FP:
 508                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++)
 509                         thread_fpr[get_fpr_index(i)] = vcpu_fpr[i];
 510
 511                 t->fpscr.val = vcpu->arch.fpscr;
 512                 t->fpexc_mode = 0;
 513                 kvmppc_load_up_fpu();
 514                 break;
 515         case MSR_VEC:
 516 #ifdef CONFIG_ALTIVEC
 517                 memcpy(t->vr, vcpu->arch.vr, sizeof(vcpu->arch.vr));
 518                 t->vscr = vcpu->arch.vscr;
 519                 t->vrsave = -1;
 520                 kvmppc_load_up_altivec();
 521 #endif
 522                 break;
 523         case MSR_VSX:
 524 #ifdef CONFIG_VSX
 525                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.vsr); i++)
 526                         thread_fpr[get_fpr_index(i) + 1] = vcpu_vsx[i];
 527                 kvmppc_load_up_vsx();
 528 #endif
 529                 break;
 530         default:
 531                 BUG();
 532         }
 533
 534         vcpu->arch.guest_owned_ext |= msr;
 535
 536         kvmppc_recalc_shadow_msr(vcpu);
 537
 538         return RESUME_GUEST;
 539 }
 540
 541 int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
 542                        unsigned int exit_nr)
 543 {
 544         int r = RESUME_HOST;
 545
 546         vcpu->stat.sum_exits++;
 547
 548         run->exit_reason = KVM_EXIT_UNKNOWN;
 549         run->ready_for_interrupt_injection = 1;
 550
 551         /* We get here with MSR.EE=0, so enable it to be a nice citizen */
 552         __hard_irq_enable();
 553
 554         trace_kvm_book3s_exit(exit_nr, vcpu);
 555         preempt_enable();
 556         kvm_resched(vcpu);
 557         switch (exit_nr) {
 558         case BOOK3S_INTERRUPT_INST_STORAGE:
 559         {
 560                 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 561                 ulong shadow_srr1 = svcpu->shadow_srr1;
 562                 vcpu->stat.pf_instruc++;
 563
 564 #ifdef CONFIG_PPC_BOOK3S_32
 565                 /* We set segments as unused segments when invalidating them. So
 566                  * treat the respective fault as segment fault. */
 567                 if (svcpu->sr[kvmppc_get_pc(vcpu) >> SID_SHIFT] == SR_INVALID) {
 568                         kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
 569                         r = RESUME_GUEST;
 570                         svcpu_put(svcpu);
 571                         break;
 572                 }
 573 #endif
 574                 svcpu_put(svcpu);
 575
 576                 /* only care about PTEG not found errors, but leave NX alone */
 577                 if (shadow_srr1 & 0x40000000) {
 578                         r = kvmppc_handle_pagefault(run, vcpu, kvmppc_get_pc(vcpu), exit_nr);
 579                         vcpu->stat.sp_instruc++;
 580                 } else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
 581                           (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
 582                         /*
 583                          * XXX If we do the dcbz hack we use the NX bit to flush&patch the page,
 584                          *     so we can't use the NX bit inside the guest. Let's cross our fingers,
 585                          *     that no guest that needs the dcbz hack does NX.
 586                          */
 587                         kvmppc_mmu_pte_flush(vcpu, kvmppc_get_pc(vcpu), ~0xFFFUL);
 588                         r = RESUME_GUEST;
 589                 } else {
 590                         vcpu->arch.shared->msr |= shadow_srr1 & 0x58000000;
 591                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 592                         r = RESUME_GUEST;
 593                 }
 594                 break;
 595         }
 596         case BOOK3S_INTERRUPT_DATA_STORAGE:
 597         {
 598                 ulong dar = kvmppc_get_fault_dar(vcpu);
 599                 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 600                 u32 fault_dsisr = svcpu->fault_dsisr;
 601                 vcpu->stat.pf_storage++;
 602
 603 #ifdef CONFIG_PPC_BOOK3S_32
 604                 /* We set segments as unused segments when invalidating them. So
 605                  * treat the respective fault as segment fault. */
 606                 if ((svcpu->sr[dar >> SID_SHIFT]) == SR_INVALID) {
 607                         kvmppc_mmu_map_segment(vcpu, dar);
 608                         r = RESUME_GUEST;
 609                         svcpu_put(svcpu);
 610                         break;
 611                 }
 612 #endif
 613                 svcpu_put(svcpu);
 614
 615                 /* The only case we need to handle is missing shadow PTEs */
 616                 if (fault_dsisr & DSISR_NOHPTE) {
 617                         r = kvmppc_handle_pagefault(run, vcpu, dar, exit_nr);
 618                 } else {
 619                         vcpu->arch.shared->dar = dar;
 620                         vcpu->arch.shared->dsisr = fault_dsisr;
 621                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 622                         r = RESUME_GUEST;
 623                 }
 624                 break;
 625         }
 626         case BOOK3S_INTERRUPT_DATA_SEGMENT:
 627                 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_fault_dar(vcpu)) < 0) {
 628                         vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
 629                         kvmppc_book3s_queue_irqprio(vcpu,
 630                                 BOOK3S_INTERRUPT_DATA_SEGMENT);
 631                 }
 632                 r = RESUME_GUEST;
 633                 break;
 634         case BOOK3S_INTERRUPT_INST_SEGMENT:
 635                 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu)) < 0) {
 636                         kvmppc_book3s_queue_irqprio(vcpu,
 637                                 BOOK3S_INTERRUPT_INST_SEGMENT);
 638                 }
 639                 r = RESUME_GUEST;
 640                 break;
 641         /* We're good on these - the host merely wanted to get our attention */
 642         case BOOK3S_INTERRUPT_DECREMENTER:
 643         case BOOK3S_INTERRUPT_HV_DECREMENTER:
 644                 vcpu->stat.dec_exits++;
 645                 r = RESUME_GUEST;
 646                 break;
 647         case BOOK3S_INTERRUPT_EXTERNAL:
 648         case BOOK3S_INTERRUPT_EXTERNAL_LEVEL:
 649         case BOOK3S_INTERRUPT_EXTERNAL_HV:
 650                 vcpu->stat.ext_intr_exits++;
 651                 r = RESUME_GUEST;
 652                 break;
 653         case BOOK3S_INTERRUPT_PERFMON:
 654                 r = RESUME_GUEST;
 655                 break;
 656         case BOOK3S_INTERRUPT_PROGRAM:
 657         case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
 658         {
 659                 enum emulation_result er;
 660                 struct kvmppc_book3s_shadow_vcpu *svcpu;
 661                 ulong flags;
 662
 663 program_interrupt:
 664                 svcpu = svcpu_get(vcpu);
 665                 flags = svcpu->shadow_srr1 & 0x1f0000ull;
 666                 svcpu_put(svcpu);
 667
 668                 if (vcpu->arch.shared->msr & MSR_PR) {
 669 #ifdef EXIT_DEBUG
 670                         printk(KERN_INFO "Userspace triggered 0x700 exception at 0x%lx (0x%x)\n", kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu));
 671 #endif
 672                         if ((kvmppc_get_last_inst(vcpu) & 0xff0007ff) !=
 673                             (INS_DCBZ & 0xfffffff7)) {
 674                                 kvmppc_core_queue_program(vcpu, flags);
 675                                 r = RESUME_GUEST;
 676                                 break;
 677                         }
 678                 }
 679
 680                 vcpu->stat.emulated_inst_exits++;
 681                 er = kvmppc_emulate_instruction(run, vcpu);
 682                 switch (er) {
 683                 case EMULATE_DONE:
 684                         r = RESUME_GUEST_NV;
 685                         break;
 686                 case EMULATE_AGAIN:
 687                         r = RESUME_GUEST;
 688                         break;
 689                 case EMULATE_FAIL:
 690                         printk(KERN_CRIT "%s: emulation at %lx failed (%08x)\n",
 691                                __func__, kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu));
 692                         kvmppc_core_queue_program(vcpu, flags);
 693                         r = RESUME_GUEST;
 694                         break;
 695                 case EMULATE_DO_MMIO:
 696                         run->exit_reason = KVM_EXIT_MMIO;
 697                         r = RESUME_HOST_NV;
 698                         break;
 699                 default:
 700                         BUG();
 701                 }
 702                 break;
 703         }
 704         case BOOK3S_INTERRUPT_SYSCALL:
 705                 if (vcpu->arch.papr_enabled &&
 706                     (kvmppc_get_last_inst(vcpu) == 0x44000022) &&
 707                     !(vcpu->arch.shared->msr & MSR_PR)) {
 708                         /* SC 1 papr hypercalls */
 709                         ulong cmd = kvmppc_get_gpr(vcpu, 3);
 710                         int i;
 711
 712 #ifdef CONFIG_KVM_BOOK3S_64_PR
 713                         if (kvmppc_h_pr(vcpu, cmd) == EMULATE_DONE) {
 714                                 r = RESUME_GUEST;
 715                                 break;
 716                         }
 717 #endif
 718
 719                         run->papr_hcall.nr = cmd;
 720                         for (i = 0; i < 9; ++i) {
 721                                 ulong gpr = kvmppc_get_gpr(vcpu, 4 + i);
 722                                 run->papr_hcall.args[i] = gpr;
 723                         }
 724                         run->exit_reason = KVM_EXIT_PAPR_HCALL;
 725                         vcpu->arch.hcall_needed = 1;
 726                         r = RESUME_HOST;
 727                 } else if (vcpu->arch.osi_enabled &&
 728                     (((u32)kvmppc_get_gpr(vcpu, 3)) == OSI_SC_MAGIC_R3) &&
 729                     (((u32)kvmppc_get_gpr(vcpu, 4)) == OSI_SC_MAGIC_R4)) {
 730                         /* MOL hypercalls */
 731                         u64 *gprs = run->osi.gprs;
 732                         int i;
 733
 734                         run->exit_reason = KVM_EXIT_OSI;
 735                         for (i = 0; i < 32; i++)
 736                                 gprs[i] = kvmppc_get_gpr(vcpu, i);
 737                         vcpu->arch.osi_needed = 1;
 738                         r = RESUME_HOST_NV;
 739                 } else if (!(vcpu->arch.shared->msr & MSR_PR) &&
 740                     (((u32)kvmppc_get_gpr(vcpu, 0)) == KVM_SC_MAGIC_R0)) {
 741                         /* KVM PV hypercalls */
 742                         kvmppc_set_gpr(vcpu, 3, kvmppc_kvm_pv(vcpu));
 743                         r = RESUME_GUEST;
 744                 } else {
 745                         /* Guest syscalls */
 746                         vcpu->stat.syscall_exits++;
 747                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 748                         r = RESUME_GUEST;
 749                 }
 750                 break;
 751         case BOOK3S_INTERRUPT_FP_UNAVAIL:
 752         case BOOK3S_INTERRUPT_ALTIVEC:
 753         case BOOK3S_INTERRUPT_VSX:
 754         {
 755                 int ext_msr = 0;
 756
 757                 switch (exit_nr) {
 758                 case BOOK3S_INTERRUPT_FP_UNAVAIL: ext_msr = MSR_FP;  break;
 759                 case BOOK3S_INTERRUPT_ALTIVEC:    ext_msr = MSR_VEC; break;
 760                 case BOOK3S_INTERRUPT_VSX:        ext_msr = MSR_VSX; break;
 761                 }
 762
 763                 switch (kvmppc_check_ext(vcpu, exit_nr)) {
 764                 case EMULATE_DONE:
 765                         /* everything ok - let's enable the ext */
 766                         r = kvmppc_handle_ext(vcpu, exit_nr, ext_msr);
 767                         break;
 768                 case EMULATE_FAIL:
 769                         /* we need to emulate this instruction */
 770                         goto program_interrupt;
 771                         break;
 772                 default:
 773                         /* nothing to worry about - go again */
 774                         break;
 775                 }
 776                 break;
 777         }
 778         case BOOK3S_INTERRUPT_ALIGNMENT:
 779                 if (kvmppc_read_inst(vcpu) == EMULATE_DONE) {
 780                         vcpu->arch.shared->dsisr = kvmppc_alignment_dsisr(vcpu,
 781                                 kvmppc_get_last_inst(vcpu));
 782                         vcpu->arch.shared->dar = kvmppc_alignment_dar(vcpu,
 783                                 kvmppc_get_last_inst(vcpu));
 784                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 785                 }
 786                 r = RESUME_GUEST;
 787                 break;
 788         case BOOK3S_INTERRUPT_MACHINE_CHECK:
 789         case BOOK3S_INTERRUPT_TRACE:
 790                 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 791                 r = RESUME_GUEST;
 792                 break;
 793         default:
 794         {
 795                 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 796                 ulong shadow_srr1 = svcpu->shadow_srr1;
 797                 svcpu_put(svcpu);
 798                 /* Ugh - bork here! What did we get? */
 799                 printk(KERN_EMERG "exit_nr=0x%x | pc=0x%lx | msr=0x%lx\n",
 800                         exit_nr, kvmppc_get_pc(vcpu), shadow_srr1);
 801                 r = RESUME_HOST;
 802                 BUG();
 803                 break;
 804         }
 805         }
 806
 807         preempt_disable();
 808         if (!(r & RESUME_HOST)) {
 809                 /* To avoid clobbering exit_reason, only check for signals if
 810                  * we aren't already exiting to userspace for some other
 811                  * reason. */
 812
 813                 /*
 814                  * Interrupts could be timers for the guest which we have to
 815                  * inject again, so let's postpone them until we're in the guest
 816                  * and if we really did time things so badly, then we just exit
 817                  * again due to a host external interrupt.
 818                  */
 819                 __hard_irq_disable();
 820                 if (signal_pending(current)) {
 821                         __hard_irq_enable();
 822 #ifdef EXIT_DEBUG
 823                         printk(KERN_EMERG "KVM: Going back to host\n");
 824 #endif
 825                         vcpu->stat.signal_exits++;
 826                         run->exit_reason = KVM_EXIT_INTR;
 827                         r = -EINTR;
 828                 } else {
 829                         /* In case an interrupt came in that was triggered
 830                          * from userspace (like DEC), we need to check what
 831                          * to inject now! */
 832                         kvmppc_core_prepare_to_enter(vcpu);
 833                 }
 834         }
 835
 836         trace_kvm_book3s_reenter(r, vcpu);
 837
 838         return r;
 839 }
 840
 841 int kvm_arch_vcpu_ioctl_get_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         sregs->pvr = vcpu->arch.pvr;
 848
 849         sregs->u.s.sdr1 = to_book3s(vcpu)->sdr1;
 850         if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) {
 851                 for (i = 0; i < 64; i++) {
 852                         sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige | i;
 853                         sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
 854                 }
 855         } else {
 856                 for (i = 0; i < 16; i++)
 857                         sregs->u.s.ppc32.sr[i] = vcpu->arch.shared->sr[i];
 858
 859                 for (i = 0; i < 8; i++) {
 860                         sregs->u.s.ppc32.ibat[i] = vcpu3s->ibat[i].raw;
 861                         sregs->u.s.ppc32.dbat[i] = vcpu3s->dbat[i].raw;
 862                 }
 863         }
 864
 865         return 0;
 866 }
 867
 868 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 869                                   struct kvm_sregs *sregs)
 870 {
 871         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 872         int i;
 873
 874         kvmppc_set_pvr(vcpu, sregs->pvr);
 875
 876         vcpu3s->sdr1 = sregs->u.s.sdr1;
 877         if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) {
 878                 for (i = 0; i < 64; i++) {
 879                         vcpu->arch.mmu.slbmte(vcpu, sregs->u.s.ppc64.slb[i].slbv,
 880                                                     sregs->u.s.ppc64.slb[i].slbe);
 881                 }
 882         } else {
 883                 for (i = 0; i < 16; i++) {
 884                         vcpu->arch.mmu.mtsrin(vcpu, i, sregs->u.s.ppc32.sr[i]);
 885                 }
 886                 for (i = 0; i < 8; i++) {
 887                         kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), false,
 888                                        (u32)sregs->u.s.ppc32.ibat[i]);
 889                         kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), true,
 890                                        (u32)(sregs->u.s.ppc32.ibat[i] >> 32));
 891                         kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), false,
 892                                        (u32)sregs->u.s.ppc32.dbat[i]);
 893                         kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), true,
 894                                        (u32)(sregs->u.s.ppc32.dbat[i] >> 32));
 895                 }
 896         }
 897
 898         /* Flush the MMU after messing with the segments */
 899         kvmppc_mmu_pte_flush(vcpu, 0, 0);
 900
 901         return 0;
 902 }
 903
 904 int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
 905 {
 906         int r = -EINVAL;
 907
 908         switch (reg->id) {
 909         case KVM_REG_PPC_HIOR:
 910                 r = copy_to_user((u64 __user *)(long)reg->addr,
 911                                 &to_book3s(vcpu)->hior, sizeof(u64));
 912                 break;
 913         default:
 914                 break;
 915         }
 916
 917         return r;
 918 }
 919
 920 int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
 921 {
 922         int r = -EINVAL;
 923
 924         switch (reg->id) {
 925         case KVM_REG_PPC_HIOR:
 926                 r = copy_from_user(&to_book3s(vcpu)->hior,
 927                                    (u64 __user *)(long)reg->addr, sizeof(u64));
 928                 if (!r)
 929                         to_book3s(vcpu)->hior_explicit = true;
 930                 break;
 931         default:
 932                 break;
 933         }
 934
 935         return r;
 936 }
 937
 938 int kvmppc_core_check_processor_compat(void)
 939 {
 940         return 0;
 941 }
 942
 943 struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
 944 {
 945         struct kvmppc_vcpu_book3s *vcpu_book3s;
 946         struct kvm_vcpu *vcpu;
 947         int err = -ENOMEM;
 948         unsigned long p;
 949
 950         vcpu_book3s = vzalloc(sizeof(struct kvmppc_vcpu_book3s));
 951         if (!vcpu_book3s)
 952                 goto out;
 953
 954         vcpu_book3s->shadow_vcpu = (struct kvmppc_book3s_shadow_vcpu *)
 955                 kzalloc(sizeof(*vcpu_book3s->shadow_vcpu), GFP_KERNEL);
 956         if (!vcpu_book3s->shadow_vcpu)
 957                 goto free_vcpu;
 958
 959         vcpu = &vcpu_book3s->vcpu;
 960         err = kvm_vcpu_init(vcpu, kvm, id);
 961         if (err)
 962                 goto free_shadow_vcpu;
 963
 964         p = __get_free_page(GFP_KERNEL|__GFP_ZERO);
 965         /* the real shared page fills the last 4k of our page */
 966         vcpu->arch.shared = (void*)(p + PAGE_SIZE - 4096);
 967         if (!p)
 968                 goto uninit_vcpu;
 969
 970 #ifdef CONFIG_PPC_BOOK3S_64
 971         /* default to book3s_64 (970fx) */
 972         vcpu->arch.pvr = 0x3C0301;
 973 #else
 974         /* default to book3s_32 (750) */
 975         vcpu->arch.pvr = 0x84202;
 976 #endif
 977         kvmppc_set_pvr(vcpu, vcpu->arch.pvr);
 978         vcpu->arch.slb_nr = 64;
 979
 980         vcpu->arch.shadow_msr = MSR_USER64;
 981
 982         err = kvmppc_mmu_init(vcpu);
 983         if (err < 0)
 984                 goto uninit_vcpu;
 985
 986         return vcpu;
 987
 988 uninit_vcpu:
 989         kvm_vcpu_uninit(vcpu);
 990 free_shadow_vcpu:
 991         kfree(vcpu_book3s->shadow_vcpu);
 992 free_vcpu:
 993         vfree(vcpu_book3s);
 994 out:
 995         return ERR_PTR(err);
 996 }
 997
 998 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
 999 {
1000         struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
1001
1002         free_page((unsigned long)vcpu->arch.shared & PAGE_MASK);
1003         kvm_vcpu_uninit(vcpu);
1004         kfree(vcpu_book3s->shadow_vcpu);
1005         vfree(vcpu_book3s);
1006 }
1007
1008 int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
1009 {
1010         int ret;
1011         double fpr[32][TS_FPRWIDTH];
1012         unsigned int fpscr;
1013         int fpexc_mode;
1014 #ifdef CONFIG_ALTIVEC
1015         vector128 vr[32];
1016         vector128 vscr;
1017         unsigned long uninitialized_var(vrsave);
1018         int used_vr;
1019 #endif
1020 #ifdef CONFIG_VSX
1021         int used_vsr;
1022 #endif
1023         ulong ext_msr;
1024
1025         preempt_disable();
1026
1027         /* Check if we can run the vcpu at all */
1028         if (!vcpu->arch.sane) {
1029                 kvm_run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1030                 ret = -EINVAL;
1031                 goto out;
1032         }
1033
1034         kvmppc_core_prepare_to_enter(vcpu);
1035
1036         /*
1037          * Interrupts could be timers for the guest which we have to inject
1038          * again, so let's postpone them until we're in the guest and if we
1039          * really did time things so badly, then we just exit again due to
1040          * a host external interrupt.
1041          */
1042         __hard_irq_disable();
1043
1044         /* No need to go into the guest when all we do is going out */
1045         if (signal_pending(current)) {
1046                 __hard_irq_enable();
1047                 kvm_run->exit_reason = KVM_EXIT_INTR;
1048                 ret = -EINTR;
1049                 goto out;
1050         }
1051
1052         /* Save FPU state in stack */
1053         if (current->thread.regs->msr & MSR_FP)
1054                 giveup_fpu(current);
1055         memcpy(fpr, current->thread.fpr, sizeof(current->thread.fpr));
1056         fpscr = current->thread.fpscr.val;
1057         fpexc_mode = current->thread.fpexc_mode;
1058
1059 #ifdef CONFIG_ALTIVEC
1060         /* Save Altivec state in stack */
1061         used_vr = current->thread.used_vr;
1062         if (used_vr) {
1063                 if (current->thread.regs->msr & MSR_VEC)
1064                         giveup_altivec(current);
1065                 memcpy(vr, current->thread.vr, sizeof(current->thread.vr));
1066                 vscr = current->thread.vscr;
1067                 vrsave = current->thread.vrsave;
1068         }
1069 #endif
1070
1071 #ifdef CONFIG_VSX
1072         /* Save VSX state in stack */
1073         used_vsr = current->thread.used_vsr;
1074         if (used_vsr && (current->thread.regs->msr & MSR_VSX))
1075                         __giveup_vsx(current);
1076 #endif
1077
1078         /* Remember the MSR with disabled extensions */
1079         ext_msr = current->thread.regs->msr;
1080
1081         /* Preload FPU if it's enabled */
1082         if (vcpu->arch.shared->msr & MSR_FP)
1083                 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
1084
1085         kvm_guest_enter();
1086
1087         ret = __kvmppc_vcpu_run(kvm_run, vcpu);
1088
1089         kvm_guest_exit();
1090
1091         current->thread.regs->msr = ext_msr;
1092
1093         /* Make sure we save the guest FPU/Altivec/VSX state */
1094         kvmppc_giveup_ext(vcpu, MSR_FP);
1095         kvmppc_giveup_ext(vcpu, MSR_VEC);
1096         kvmppc_giveup_ext(vcpu, MSR_VSX);
1097
1098         /* Restore FPU state from stack */
1099         memcpy(current->thread.fpr, fpr, sizeof(current->thread.fpr));
1100         current->thread.fpscr.val = fpscr;
1101         current->thread.fpexc_mode = fpexc_mode;
1102
1103 #ifdef CONFIG_ALTIVEC
1104         /* Restore Altivec state from stack */
1105         if (used_vr && current->thread.used_vr) {
1106                 memcpy(current->thread.vr, vr, sizeof(current->thread.vr));
1107                 current->thread.vscr = vscr;
1108                 current->thread.vrsave = vrsave;
1109         }
1110         current->thread.used_vr = used_vr;
1111 #endif
1112
1113 #ifdef CONFIG_VSX
1114         current->thread.used_vsr = used_vsr;
1115 #endif
1116
1117 out:
1118         preempt_enable();
1119         return ret;
1120 }
1121
1122 /*
1123  * Get (and clear) the dirty memory log for a memory slot.
1124  */
1125 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
1126                                       struct kvm_dirty_log *log)
1127 {
1128         struct kvm_memory_slot *memslot;
1129         struct kvm_vcpu *vcpu;
1130         ulong ga, ga_end;
1131         int is_dirty = 0;
1132         int r;
1133         unsigned long n;
1134
1135         mutex_lock(&kvm->slots_lock);
1136
1137         r = kvm_get_dirty_log(kvm, log, &is_dirty);
1138         if (r)
1139                 goto out;
1140
1141         /* If nothing is dirty, don't bother messing with page tables. */
1142         if (is_dirty) {
1143                 memslot = id_to_memslot(kvm->memslots, log->slot);
1144
1145                 ga = memslot->base_gfn << PAGE_SHIFT;
1146                 ga_end = ga + (memslot->npages << PAGE_SHIFT);
1147
1148                 kvm_for_each_vcpu(n, vcpu, kvm)
1149                         kvmppc_mmu_pte_pflush(vcpu, ga, ga_end);
1150
1151                 n = kvm_dirty_bitmap_bytes(memslot);
1152                 memset(memslot->dirty_bitmap, 0, n);
1153         }
1154
1155         r = 0;
1156 out:
1157         mutex_unlock(&kvm->slots_lock);
1158         return r;
1159 }
1160
1161 #ifdef CONFIG_PPC64
1162 int kvm_vm_ioctl_get_smmu_info(struct kvm *kvm, struct kvm_ppc_smmu_info *info)
1163 {
1164         /* No flags */
1165         info->flags = 0;
1166
1167         /* SLB is always 64 entries */
1168         info->slb_size = 64;
1169
1170         /* Standard 4k base page size segment */
1171         info->sps[0].page_shift = 12;
1172         info->sps[0].slb_enc = 0;
1173         info->sps[0].enc[0].page_shift = 12;
1174         info->sps[0].enc[0].pte_enc = 0;
1175
1176         /* Standard 16M large page size segment */
1177         info->sps[1].page_shift = 24;
1178         info->sps[1].slb_enc = SLB_VSID_L;
1179         info->sps[1].enc[0].page_shift = 24;
1180         info->sps[1].enc[0].pte_enc = 0;
1181
1182         return 0;
1183 }
1184 #endif /* CONFIG_PPC64 */
1185
1186 int kvmppc_core_prepare_memory_region(struct kvm *kvm,
1187                                       struct kvm_userspace_memory_region *mem)
1188 {
1189         return 0;
1190 }
1191
1192 void kvmppc_core_commit_memory_region(struct kvm *kvm,
1193                                 struct kvm_userspace_memory_region *mem)
1194 {
1195 }
1196
1197 int kvmppc_core_init_vm(struct kvm *kvm)
1198 {
1199 #ifdef CONFIG_PPC64
1200         INIT_LIST_HEAD(&kvm->arch.spapr_tce_tables);
1201 #endif
1202
1203         return 0;
1204 }
1205
1206 void kvmppc_core_destroy_vm(struct kvm *kvm)
1207 {
1208 #ifdef CONFIG_PPC64
1209         WARN_ON(!list_empty(&kvm->arch.spapr_tce_tables));
1210 #endif
1211 }
1212
1213 static int kvmppc_book3s_init(void)
1214 {
1215         int r;
1216
1217         r = kvm_init(NULL, sizeof(struct kvmppc_vcpu_book3s), 0,
1218                      THIS_MODULE);
1219
1220         if (r)
1221                 return r;
1222
1223         r = kvmppc_mmu_hpte_sysinit();
1224
1225         return r;
1226 }
1227
1228 static void kvmppc_book3s_exit(void)
1229 {
1230         kvmppc_mmu_hpte_sysexit();
1231         kvm_exit();
1232 }
1233
1234 module_init(kvmppc_book3s_init);
1235 module_exit(kvmppc_book3s_exit);