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 void kvmppc_core_check_requests(struct kvm_vcpu *vcpu)
  92 {
  93 }
  94
  95 static void kvmppc_recalc_shadow_msr(struct kvm_vcpu *vcpu)
  96 {
  97         ulong smsr = vcpu->arch.shared->msr;
  98
  99         /* Guest MSR values */
 100         smsr &= MSR_FE0 | MSR_FE1 | MSR_SF | MSR_SE | MSR_BE | MSR_DE;
 101         /* Process MSR values */
 102         smsr |= MSR_ME | MSR_RI | MSR_IR | MSR_DR | MSR_PR | MSR_EE;
 103         /* External providers the guest reserved */
 104         smsr |= (vcpu->arch.shared->msr & vcpu->arch.guest_owned_ext);
 105         /* 64-bit Process MSR values */
 106 #ifdef CONFIG_PPC_BOOK3S_64
 107         smsr |= MSR_ISF | MSR_HV;
 108 #endif
 109         vcpu->arch.shadow_msr = smsr;
 110 }
 111
 112 void kvmppc_set_msr(struct kvm_vcpu *vcpu, u64 msr)
 113 {
 114         ulong old_msr = vcpu->arch.shared->msr;
 115
 116 #ifdef EXIT_DEBUG
 117         printk(KERN_INFO "KVM: Set MSR to 0x%llx\n", msr);
 118 #endif
 119
 120         msr &= to_book3s(vcpu)->msr_mask;
 121         vcpu->arch.shared->msr = msr;
 122         kvmppc_recalc_shadow_msr(vcpu);
 123
 124         if (msr & MSR_POW) {
 125                 if (!vcpu->arch.pending_exceptions) {
 126                         kvm_vcpu_block(vcpu);
 127                         clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
 128                         vcpu->stat.halt_wakeup++;
 129
 130                         /* Unset POW bit after we woke up */
 131                         msr &= ~MSR_POW;
 132                         vcpu->arch.shared->msr = msr;
 133                 }
 134         }
 135
 136         if ((vcpu->arch.shared->msr & (MSR_PR|MSR_IR|MSR_DR)) !=
 137                    (old_msr & (MSR_PR|MSR_IR|MSR_DR))) {
 138                 kvmppc_mmu_flush_segments(vcpu);
 139                 kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
 140
 141                 /* Preload magic page segment when in kernel mode */
 142                 if (!(msr & MSR_PR) && vcpu->arch.magic_page_pa) {
 143                         struct kvm_vcpu_arch *a = &vcpu->arch;
 144
 145                         if (msr & MSR_DR)
 146                                 kvmppc_mmu_map_segment(vcpu, a->magic_page_ea);
 147                         else
 148                                 kvmppc_mmu_map_segment(vcpu, a->magic_page_pa);
 149                 }
 150         }
 151
 152         /*
 153          * When switching from 32 to 64-bit, we may have a stale 32-bit
 154          * magic page around, we need to flush it. Typically 32-bit magic
 155          * page will be instanciated when calling into RTAS. Note: We
 156          * assume that such transition only happens while in kernel mode,
 157          * ie, we never transition from user 32-bit to kernel 64-bit with
 158          * a 32-bit magic page around.
 159          */
 160         if (vcpu->arch.magic_page_pa &&
 161             !(old_msr & MSR_PR) && !(old_msr & MSR_SF) && (msr & MSR_SF)) {
 162                 /* going from RTAS to normal kernel code */
 163                 kvmppc_mmu_pte_flush(vcpu, (uint32_t)vcpu->arch.magic_page_pa,
 164                                      ~0xFFFUL);
 165         }
 166
 167         /* Preload FPU if it's enabled */
 168         if (vcpu->arch.shared->msr & MSR_FP)
 169                 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
 170 }
 171
 172 void kvmppc_set_pvr(struct kvm_vcpu *vcpu, u32 pvr)
 173 {
 174         u32 host_pvr;
 175
 176         vcpu->arch.hflags &= ~BOOK3S_HFLAG_SLB;
 177         vcpu->arch.pvr = pvr;
 178 #ifdef CONFIG_PPC_BOOK3S_64
 179         if ((pvr >= 0x330000) && (pvr < 0x70330000)) {
 180                 kvmppc_mmu_book3s_64_init(vcpu);
 181                 if (!to_book3s(vcpu)->hior_explicit)
 182                         to_book3s(vcpu)->hior = 0xfff00000;
 183                 to_book3s(vcpu)->msr_mask = 0xffffffffffffffffULL;
 184                 vcpu->arch.cpu_type = KVM_CPU_3S_64;
 185         } else
 186 #endif
 187         {
 188                 kvmppc_mmu_book3s_32_init(vcpu);
 189                 if (!to_book3s(vcpu)->hior_explicit)
 190                         to_book3s(vcpu)->hior = 0;
 191                 to_book3s(vcpu)->msr_mask = 0xffffffffULL;
 192                 vcpu->arch.cpu_type = KVM_CPU_3S_32;
 193         }
 194
 195         kvmppc_sanity_check(vcpu);
 196
 197         /* If we are in hypervisor level on 970, we can tell the CPU to
 198          * treat DCBZ as 32 bytes store */
 199         vcpu->arch.hflags &= ~BOOK3S_HFLAG_DCBZ32;
 200         if (vcpu->arch.mmu.is_dcbz32(vcpu) && (mfmsr() & MSR_HV) &&
 201             !strcmp(cur_cpu_spec->platform, "ppc970"))
 202                 vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
 203
 204         /* Cell performs badly if MSR_FEx are set. So let's hope nobody
 205            really needs them in a VM on Cell and force disable them. */
 206         if (!strcmp(cur_cpu_spec->platform, "ppc-cell-be"))
 207                 to_book3s(vcpu)->msr_mask &= ~(MSR_FE0 | MSR_FE1);
 208
 209 #ifdef CONFIG_PPC_BOOK3S_32
 210         /* 32 bit Book3S always has 32 byte dcbz */
 211         vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
 212 #endif
 213
 214         /* On some CPUs we can execute paired single operations natively */
 215         asm ( "mfpvr %0" : "=r"(host_pvr));
 216         switch (host_pvr) {
 217         case 0x00080200:        /* lonestar 2.0 */
 218         case 0x00088202:        /* lonestar 2.2 */
 219         case 0x70000100:        /* gekko 1.0 */
 220         case 0x00080100:        /* gekko 2.0 */
 221         case 0x00083203:        /* gekko 2.3a */
 222         case 0x00083213:        /* gekko 2.3b */
 223         case 0x00083204:        /* gekko 2.4 */
 224         case 0x00083214:        /* gekko 2.4e (8SE) - retail HW2 */
 225         case 0x00087200:        /* broadway */
 226                 vcpu->arch.hflags |= BOOK3S_HFLAG_NATIVE_PS;
 227                 /* Enable HID2.PSE - in case we need it later */
 228                 mtspr(SPRN_HID2_GEKKO, mfspr(SPRN_HID2_GEKKO) | (1 << 29));
 229         }
 230 }
 231
 232 /* Book3s_32 CPUs always have 32 bytes cache line size, which Linux assumes. To
 233  * make Book3s_32 Linux work on Book3s_64, we have to make sure we trap dcbz to
 234  * emulate 32 bytes dcbz length.
 235  *
 236  * The Book3s_64 inventors also realized this case and implemented a special bit
 237  * in the HID5 register, which is a hypervisor ressource. Thus we can't use it.
 238  *
 239  * My approach here is to patch the dcbz instruction on executing pages.
 240  */
 241 static void kvmppc_patch_dcbz(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
 242 {
 243         struct page *hpage;
 244         u64 hpage_offset;
 245         u32 *page;
 246         int i;
 247
 248         hpage = gfn_to_page(vcpu->kvm, pte->raddr >> PAGE_SHIFT);
 249         if (is_error_page(hpage))
 250                 return;
 251
 252         hpage_offset = pte->raddr & ~PAGE_MASK;
 253         hpage_offset &= ~0xFFFULL;
 254         hpage_offset /= 4;
 255
 256         get_page(hpage);
 257         page = kmap_atomic(hpage);
 258
 259         /* patch dcbz into reserved instruction, so we trap */
 260         for (i=hpage_offset; i < hpage_offset + (HW_PAGE_SIZE / 4); i++)
 261                 if ((page[i] & 0xff0007ff) == INS_DCBZ)
 262                         page[i] &= 0xfffffff7;
 263
 264         kunmap_atomic(page);
 265         put_page(hpage);
 266 }
 267
 268 static int kvmppc_visible_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
 269 {
 270         ulong mp_pa = vcpu->arch.magic_page_pa;
 271
 272         if (!(vcpu->arch.shared->msr & MSR_SF))
 273                 mp_pa = (uint32_t)mp_pa;
 274
 275         if (unlikely(mp_pa) &&
 276             unlikely((mp_pa & KVM_PAM) >> PAGE_SHIFT == gfn)) {
 277                 return 1;
 278         }
 279
 280         return kvm_is_visible_gfn(vcpu->kvm, gfn);
 281 }
 282
 283 int kvmppc_handle_pagefault(struct kvm_run *run, struct kvm_vcpu *vcpu,
 284                             ulong eaddr, int vec)
 285 {
 286         bool data = (vec == BOOK3S_INTERRUPT_DATA_STORAGE);
 287         int r = RESUME_GUEST;
 288         int relocated;
 289         int page_found = 0;
 290         struct kvmppc_pte pte;
 291         bool is_mmio = false;
 292         bool dr = (vcpu->arch.shared->msr & MSR_DR) ? true : false;
 293         bool ir = (vcpu->arch.shared->msr & MSR_IR) ? true : false;
 294         u64 vsid;
 295
 296         relocated = data ? dr : ir;
 297
 298         /* Resolve real address if translation turned on */
 299         if (relocated) {
 300                 page_found = vcpu->arch.mmu.xlate(vcpu, eaddr, &pte, data);
 301         } else {
 302                 pte.may_execute = true;
 303                 pte.may_read = true;
 304                 pte.may_write = true;
 305                 pte.raddr = eaddr & KVM_PAM;
 306                 pte.eaddr = eaddr;
 307                 pte.vpage = eaddr >> 12;
 308         }
 309
 310         switch (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) {
 311         case 0:
 312                 pte.vpage |= ((u64)VSID_REAL << (SID_SHIFT - 12));
 313                 break;
 314         case MSR_DR:
 315         case MSR_IR:
 316                 vcpu->arch.mmu.esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid);
 317
 318                 if ((vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) == MSR_DR)
 319                         pte.vpage |= ((u64)VSID_REAL_DR << (SID_SHIFT - 12));
 320                 else
 321                         pte.vpage |= ((u64)VSID_REAL_IR << (SID_SHIFT - 12));
 322                 pte.vpage |= vsid;
 323
 324                 if (vsid == -1)
 325                         page_found = -EINVAL;
 326                 break;
 327         }
 328
 329         if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
 330            (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
 331                 /*
 332                  * If we do the dcbz hack, we have to NX on every execution,
 333                  * so we can patch the executing code. This renders our guest
 334                  * NX-less.
 335                  */
 336                 pte.may_execute = !data;
 337         }
 338
 339         if (page_found == -ENOENT) {
 340                 /* Page not found in guest PTE entries */
 341                 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 342                 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
 343                 vcpu->arch.shared->dsisr = svcpu->fault_dsisr;
 344                 vcpu->arch.shared->msr |=
 345                         (svcpu->shadow_srr1 & 0x00000000f8000000ULL);
 346                 svcpu_put(svcpu);
 347                 kvmppc_book3s_queue_irqprio(vcpu, vec);
 348         } else if (page_found == -EPERM) {
 349                 /* Storage protection */
 350                 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 351                 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
 352                 vcpu->arch.shared->dsisr = svcpu->fault_dsisr & ~DSISR_NOHPTE;
 353                 vcpu->arch.shared->dsisr |= DSISR_PROTFAULT;
 354                 vcpu->arch.shared->msr |=
 355                         svcpu->shadow_srr1 & 0x00000000f8000000ULL;
 356                 svcpu_put(svcpu);
 357                 kvmppc_book3s_queue_irqprio(vcpu, vec);
 358         } else if (page_found == -EINVAL) {
 359                 /* Page not found in guest SLB */
 360                 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
 361                 kvmppc_book3s_queue_irqprio(vcpu, vec + 0x80);
 362         } else if (!is_mmio &&
 363                    kvmppc_visible_gfn(vcpu, pte.raddr >> PAGE_SHIFT)) {
 364                 /* The guest's PTE is not mapped yet. Map on the host */
 365                 kvmppc_mmu_map_page(vcpu, &pte);
 366                 if (data)
 367                         vcpu->stat.sp_storage++;
 368                 else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
 369                         (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32)))
 370                         kvmppc_patch_dcbz(vcpu, &pte);
 371         } else {
 372                 /* MMIO */
 373                 vcpu->stat.mmio_exits++;
 374                 vcpu->arch.paddr_accessed = pte.raddr;
 375                 vcpu->arch.vaddr_accessed = pte.eaddr;
 376                 r = kvmppc_emulate_mmio(run, vcpu);
 377                 if ( r == RESUME_HOST_NV )
 378                         r = RESUME_HOST;
 379         }
 380
 381         return r;
 382 }
 383
 384 static inline int get_fpr_index(int i)
 385 {
 386 #ifdef CONFIG_VSX
 387         i *= 2;
 388 #endif
 389         return i;
 390 }
 391
 392 /* Give up external provider (FPU, Altivec, VSX) */
 393 void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr)
 394 {
 395         struct thread_struct *t = &current->thread;
 396         u64 *vcpu_fpr = vcpu->arch.fpr;
 397 #ifdef CONFIG_VSX
 398         u64 *vcpu_vsx = vcpu->arch.vsr;
 399 #endif
 400         u64 *thread_fpr = (u64*)t->fpr;
 401         int i;
 402
 403         if (!(vcpu->arch.guest_owned_ext & msr))
 404                 return;
 405
 406 #ifdef DEBUG_EXT
 407         printk(KERN_INFO "Giving up ext 0x%lx\n", msr);
 408 #endif
 409
 410         switch (msr) {
 411         case MSR_FP:
 412                 giveup_fpu(current);
 413                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++)
 414                         vcpu_fpr[i] = thread_fpr[get_fpr_index(i)];
 415
 416                 vcpu->arch.fpscr = t->fpscr.val;
 417                 break;
 418         case MSR_VEC:
 419 #ifdef CONFIG_ALTIVEC
 420                 giveup_altivec(current);
 421                 memcpy(vcpu->arch.vr, t->vr, sizeof(vcpu->arch.vr));
 422                 vcpu->arch.vscr = t->vscr;
 423 #endif
 424                 break;
 425         case MSR_VSX:
 426 #ifdef CONFIG_VSX
 427                 __giveup_vsx(current);
 428                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.vsr); i++)
 429                         vcpu_vsx[i] = thread_fpr[get_fpr_index(i) + 1];
 430 #endif
 431                 break;
 432         default:
 433                 BUG();
 434         }
 435
 436         vcpu->arch.guest_owned_ext &= ~msr;
 437         current->thread.regs->msr &= ~msr;
 438         kvmppc_recalc_shadow_msr(vcpu);
 439 }
 440
 441 static int kvmppc_read_inst(struct kvm_vcpu *vcpu)
 442 {
 443         ulong srr0 = kvmppc_get_pc(vcpu);
 444         u32 last_inst = kvmppc_get_last_inst(vcpu);
 445         int ret;
 446
 447         ret = kvmppc_ld(vcpu, &srr0, sizeof(u32), &last_inst, false);
 448         if (ret == -ENOENT) {
 449                 ulong msr = vcpu->arch.shared->msr;
 450
 451                 msr = kvmppc_set_field(msr, 33, 33, 1);
 452                 msr = kvmppc_set_field(msr, 34, 36, 0);
 453                 vcpu->arch.shared->msr = kvmppc_set_field(msr, 42, 47, 0);
 454                 kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_INST_STORAGE);
 455                 return EMULATE_AGAIN;
 456         }
 457
 458         return EMULATE_DONE;
 459 }
 460
 461 static int kvmppc_check_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr)
 462 {
 463
 464         /* Need to do paired single emulation? */
 465         if (!(vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE))
 466                 return EMULATE_DONE;
 467
 468         /* Read out the instruction */
 469         if (kvmppc_read_inst(vcpu) == EMULATE_DONE)
 470                 /* Need to emulate */
 471                 return EMULATE_FAIL;
 472
 473         return EMULATE_AGAIN;
 474 }
 475
 476 /* Handle external providers (FPU, Altivec, VSX) */
 477 static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
 478                              ulong msr)
 479 {
 480         struct thread_struct *t = &current->thread;
 481         u64 *vcpu_fpr = vcpu->arch.fpr;
 482 #ifdef CONFIG_VSX
 483         u64 *vcpu_vsx = vcpu->arch.vsr;
 484 #endif
 485         u64 *thread_fpr = (u64*)t->fpr;
 486         int i;
 487
 488         /* When we have paired singles, we emulate in software */
 489         if (vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE)
 490                 return RESUME_GUEST;
 491
 492         if (!(vcpu->arch.shared->msr & msr)) {
 493                 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 494                 return RESUME_GUEST;
 495         }
 496
 497         /* We already own the ext */
 498         if (vcpu->arch.guest_owned_ext & msr) {
 499                 return RESUME_GUEST;
 500         }
 501
 502 #ifdef DEBUG_EXT
 503         printk(KERN_INFO "Loading up ext 0x%lx\n", msr);
 504 #endif
 505
 506         current->thread.regs->msr |= msr;
 507
 508         switch (msr) {
 509         case MSR_FP:
 510                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++)
 511                         thread_fpr[get_fpr_index(i)] = vcpu_fpr[i];
 512
 513                 t->fpscr.val = vcpu->arch.fpscr;
 514                 t->fpexc_mode = 0;
 515                 kvmppc_load_up_fpu();
 516                 break;
 517         case MSR_VEC:
 518 #ifdef CONFIG_ALTIVEC
 519                 memcpy(t->vr, vcpu->arch.vr, sizeof(vcpu->arch.vr));
 520                 t->vscr = vcpu->arch.vscr;
 521                 t->vrsave = -1;
 522                 kvmppc_load_up_altivec();
 523 #endif
 524                 break;
 525         case MSR_VSX:
 526 #ifdef CONFIG_VSX
 527                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.vsr); i++)
 528                         thread_fpr[get_fpr_index(i) + 1] = vcpu_vsx[i];
 529                 kvmppc_load_up_vsx();
 530 #endif
 531                 break;
 532         default:
 533                 BUG();
 534         }
 535
 536         vcpu->arch.guest_owned_ext |= msr;
 537
 538         kvmppc_recalc_shadow_msr(vcpu);
 539
 540         return RESUME_GUEST;
 541 }
 542
 543 int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
 544                        unsigned int exit_nr)
 545 {
 546         int r = RESUME_HOST;
 547
 548         vcpu->stat.sum_exits++;
 549
 550         run->exit_reason = KVM_EXIT_UNKNOWN;
 551         run->ready_for_interrupt_injection = 1;
 552
 553         /* We get here with MSR.EE=0, so enable it to be a nice citizen */
 554         __hard_irq_enable();
 555
 556         trace_kvm_exit(exit_nr, vcpu);
 557         preempt_enable();
 558         kvm_resched(vcpu);
 559         switch (exit_nr) {
 560         case BOOK3S_INTERRUPT_INST_STORAGE:
 561         {
 562                 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 563                 ulong shadow_srr1 = svcpu->shadow_srr1;
 564                 vcpu->stat.pf_instruc++;
 565
 566 #ifdef CONFIG_PPC_BOOK3S_32
 567                 /* We set segments as unused segments when invalidating them. So
 568                  * treat the respective fault as segment fault. */
 569                 if (svcpu->sr[kvmppc_get_pc(vcpu) >> SID_SHIFT] == SR_INVALID) {
 570                         kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
 571                         r = RESUME_GUEST;
 572                         svcpu_put(svcpu);
 573                         break;
 574                 }
 575 #endif
 576                 svcpu_put(svcpu);
 577
 578                 /* only care about PTEG not found errors, but leave NX alone */
 579                 if (shadow_srr1 & 0x40000000) {
 580                         r = kvmppc_handle_pagefault(run, vcpu, kvmppc_get_pc(vcpu), exit_nr);
 581                         vcpu->stat.sp_instruc++;
 582                 } else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
 583                           (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
 584                         /*
 585                          * XXX If we do the dcbz hack we use the NX bit to flush&patch the page,
 586                          *     so we can't use the NX bit inside the guest. Let's cross our fingers,
 587                          *     that no guest that needs the dcbz hack does NX.
 588                          */
 589                         kvmppc_mmu_pte_flush(vcpu, kvmppc_get_pc(vcpu), ~0xFFFUL);
 590                         r = RESUME_GUEST;
 591                 } else {
 592                         vcpu->arch.shared->msr |= shadow_srr1 & 0x58000000;
 593                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 594                         r = RESUME_GUEST;
 595                 }
 596                 break;
 597         }
 598         case BOOK3S_INTERRUPT_DATA_STORAGE:
 599         {
 600                 ulong dar = kvmppc_get_fault_dar(vcpu);
 601                 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 602                 u32 fault_dsisr = svcpu->fault_dsisr;
 603                 vcpu->stat.pf_storage++;
 604
 605 #ifdef CONFIG_PPC_BOOK3S_32
 606                 /* We set segments as unused segments when invalidating them. So
 607                  * treat the respective fault as segment fault. */
 608                 if ((svcpu->sr[dar >> SID_SHIFT]) == SR_INVALID) {
 609                         kvmppc_mmu_map_segment(vcpu, dar);
 610                         r = RESUME_GUEST;
 611                         svcpu_put(svcpu);
 612                         break;
 613                 }
 614 #endif
 615                 svcpu_put(svcpu);
 616
 617                 /* The only case we need to handle is missing shadow PTEs */
 618                 if (fault_dsisr & DSISR_NOHPTE) {
 619                         r = kvmppc_handle_pagefault(run, vcpu, dar, exit_nr);
 620                 } else {
 621                         vcpu->arch.shared->dar = dar;
 622                         vcpu->arch.shared->dsisr = fault_dsisr;
 623                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 624                         r = RESUME_GUEST;
 625                 }
 626                 break;
 627         }
 628         case BOOK3S_INTERRUPT_DATA_SEGMENT:
 629                 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_fault_dar(vcpu)) < 0) {
 630                         vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
 631                         kvmppc_book3s_queue_irqprio(vcpu,
 632                                 BOOK3S_INTERRUPT_DATA_SEGMENT);
 633                 }
 634                 r = RESUME_GUEST;
 635                 break;
 636         case BOOK3S_INTERRUPT_INST_SEGMENT:
 637                 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu)) < 0) {
 638                         kvmppc_book3s_queue_irqprio(vcpu,
 639                                 BOOK3S_INTERRUPT_INST_SEGMENT);
 640                 }
 641                 r = RESUME_GUEST;
 642                 break;
 643         /* We're good on these - the host merely wanted to get our attention */
 644         case BOOK3S_INTERRUPT_DECREMENTER:
 645         case BOOK3S_INTERRUPT_HV_DECREMENTER:
 646                 vcpu->stat.dec_exits++;
 647                 r = RESUME_GUEST;
 648                 break;
 649         case BOOK3S_INTERRUPT_EXTERNAL:
 650         case BOOK3S_INTERRUPT_EXTERNAL_LEVEL:
 651         case BOOK3S_INTERRUPT_EXTERNAL_HV:
 652                 vcpu->stat.ext_intr_exits++;
 653                 r = RESUME_GUEST;
 654                 break;
 655         case BOOK3S_INTERRUPT_PERFMON:
 656                 r = RESUME_GUEST;
 657                 break;
 658         case BOOK3S_INTERRUPT_PROGRAM:
 659         case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
 660         {
 661                 enum emulation_result er;
 662                 struct kvmppc_book3s_shadow_vcpu *svcpu;
 663                 ulong flags;
 664
 665 program_interrupt:
 666                 svcpu = svcpu_get(vcpu);
 667                 flags = svcpu->shadow_srr1 & 0x1f0000ull;
 668                 svcpu_put(svcpu);
 669
 670                 if (vcpu->arch.shared->msr & MSR_PR) {
 671 #ifdef EXIT_DEBUG
 672                         printk(KERN_INFO "Userspace triggered 0x700 exception at 0x%lx (0x%x)\n", kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu));
 673 #endif
 674                         if ((kvmppc_get_last_inst(vcpu) & 0xff0007ff) !=
 675                             (INS_DCBZ & 0xfffffff7)) {
 676                                 kvmppc_core_queue_program(vcpu, flags);
 677                                 r = RESUME_GUEST;
 678                                 break;
 679                         }
 680                 }
 681
 682                 vcpu->stat.emulated_inst_exits++;
 683                 er = kvmppc_emulate_instruction(run, vcpu);
 684                 switch (er) {
 685                 case EMULATE_DONE:
 686                         r = RESUME_GUEST_NV;
 687                         break;
 688                 case EMULATE_AGAIN:
 689                         r = RESUME_GUEST;
 690                         break;
 691                 case EMULATE_FAIL:
 692                         printk(KERN_CRIT "%s: emulation at %lx failed (%08x)\n",
 693                                __func__, kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu));
 694                         kvmppc_core_queue_program(vcpu, flags);
 695                         r = RESUME_GUEST;
 696                         break;
 697                 case EMULATE_DO_MMIO:
 698                         run->exit_reason = KVM_EXIT_MMIO;
 699                         r = RESUME_HOST_NV;
 700                         break;
 701                 default:
 702                         BUG();
 703                 }
 704                 break;
 705         }
 706         case BOOK3S_INTERRUPT_SYSCALL:
 707                 if (vcpu->arch.papr_enabled &&
 708                     (kvmppc_get_last_inst(vcpu) == 0x44000022) &&
 709                     !(vcpu->arch.shared->msr & MSR_PR)) {
 710                         /* SC 1 papr hypercalls */
 711                         ulong cmd = kvmppc_get_gpr(vcpu, 3);
 712                         int i;
 713
 714 #ifdef CONFIG_KVM_BOOK3S_64_PR
 715                         if (kvmppc_h_pr(vcpu, cmd) == EMULATE_DONE) {
 716                                 r = RESUME_GUEST;
 717                                 break;
 718                         }
 719 #endif
 720
 721                         run->papr_hcall.nr = cmd;
 722                         for (i = 0; i < 9; ++i) {
 723                                 ulong gpr = kvmppc_get_gpr(vcpu, 4 + i);
 724                                 run->papr_hcall.args[i] = gpr;
 725                         }
 726                         run->exit_reason = KVM_EXIT_PAPR_HCALL;
 727                         vcpu->arch.hcall_needed = 1;
 728                         r = RESUME_HOST;
 729                 } else if (vcpu->arch.osi_enabled &&
 730                     (((u32)kvmppc_get_gpr(vcpu, 3)) == OSI_SC_MAGIC_R3) &&
 731                     (((u32)kvmppc_get_gpr(vcpu, 4)) == OSI_SC_MAGIC_R4)) {
 732                         /* MOL hypercalls */
 733                         u64 *gprs = run->osi.gprs;
 734                         int i;
 735
 736                         run->exit_reason = KVM_EXIT_OSI;
 737                         for (i = 0; i < 32; i++)
 738                                 gprs[i] = kvmppc_get_gpr(vcpu, i);
 739                         vcpu->arch.osi_needed = 1;
 740                         r = RESUME_HOST_NV;
 741                 } else if (!(vcpu->arch.shared->msr & MSR_PR) &&
 742                     (((u32)kvmppc_get_gpr(vcpu, 0)) == KVM_SC_MAGIC_R0)) {
 743                         /* KVM PV hypercalls */
 744                         kvmppc_set_gpr(vcpu, 3, kvmppc_kvm_pv(vcpu));
 745                         r = RESUME_GUEST;
 746                 } else {
 747                         /* Guest syscalls */
 748                         vcpu->stat.syscall_exits++;
 749                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 750                         r = RESUME_GUEST;
 751                 }
 752                 break;
 753         case BOOK3S_INTERRUPT_FP_UNAVAIL:
 754         case BOOK3S_INTERRUPT_ALTIVEC:
 755         case BOOK3S_INTERRUPT_VSX:
 756         {
 757                 int ext_msr = 0;
 758
 759                 switch (exit_nr) {
 760                 case BOOK3S_INTERRUPT_FP_UNAVAIL: ext_msr = MSR_FP;  break;
 761                 case BOOK3S_INTERRUPT_ALTIVEC:    ext_msr = MSR_VEC; break;
 762                 case BOOK3S_INTERRUPT_VSX:        ext_msr = MSR_VSX; break;
 763                 }
 764
 765                 switch (kvmppc_check_ext(vcpu, exit_nr)) {
 766                 case EMULATE_DONE:
 767                         /* everything ok - let's enable the ext */
 768                         r = kvmppc_handle_ext(vcpu, exit_nr, ext_msr);
 769                         break;
 770                 case EMULATE_FAIL:
 771                         /* we need to emulate this instruction */
 772                         goto program_interrupt;
 773                         break;
 774                 default:
 775                         /* nothing to worry about - go again */
 776                         break;
 777                 }
 778                 break;
 779         }
 780         case BOOK3S_INTERRUPT_ALIGNMENT:
 781                 if (kvmppc_read_inst(vcpu) == EMULATE_DONE) {
 782                         vcpu->arch.shared->dsisr = kvmppc_alignment_dsisr(vcpu,
 783                                 kvmppc_get_last_inst(vcpu));
 784                         vcpu->arch.shared->dar = kvmppc_alignment_dar(vcpu,
 785                                 kvmppc_get_last_inst(vcpu));
 786                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 787                 }
 788                 r = RESUME_GUEST;
 789                 break;
 790         case BOOK3S_INTERRUPT_MACHINE_CHECK:
 791         case BOOK3S_INTERRUPT_TRACE:
 792                 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 793                 r = RESUME_GUEST;
 794                 break;
 795         default:
 796         {
 797                 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 798                 ulong shadow_srr1 = svcpu->shadow_srr1;
 799                 svcpu_put(svcpu);
 800                 /* Ugh - bork here! What did we get? */
 801                 printk(KERN_EMERG "exit_nr=0x%x | pc=0x%lx | msr=0x%lx\n",
 802                         exit_nr, kvmppc_get_pc(vcpu), shadow_srr1);
 803                 r = RESUME_HOST;
 804                 BUG();
 805                 break;
 806         }
 807         }
 808
 809         preempt_disable();
 810         if (!(r & RESUME_HOST)) {
 811                 /* To avoid clobbering exit_reason, only check for signals if
 812                  * we aren't already exiting to userspace for some other
 813                  * reason. */
 814
 815                 /*
 816                  * Interrupts could be timers for the guest which we have to
 817                  * inject again, so let's postpone them until we're in the guest
 818                  * and if we really did time things so badly, then we just exit
 819                  * again due to a host external interrupt.
 820                  */
 821                 __hard_irq_disable();
 822                 if (kvmppc_prepare_to_enter(vcpu)) {
 823                         run->exit_reason = KVM_EXIT_INTR;
 824                         r = -EINTR;
 825                 }
 826         }
 827
 828         trace_kvm_book3s_reenter(r, vcpu);
 829
 830         return r;
 831 }
 832
 833 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 834                                   struct kvm_sregs *sregs)
 835 {
 836         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 837         int i;
 838
 839         sregs->pvr = vcpu->arch.pvr;
 840
 841         sregs->u.s.sdr1 = to_book3s(vcpu)->sdr1;
 842         if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) {
 843                 for (i = 0; i < 64; i++) {
 844                         sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige | i;
 845                         sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
 846                 }
 847         } else {
 848                 for (i = 0; i < 16; i++)
 849                         sregs->u.s.ppc32.sr[i] = vcpu->arch.shared->sr[i];
 850
 851                 for (i = 0; i < 8; i++) {
 852                         sregs->u.s.ppc32.ibat[i] = vcpu3s->ibat[i].raw;
 853                         sregs->u.s.ppc32.dbat[i] = vcpu3s->dbat[i].raw;
 854                 }
 855         }
 856
 857         return 0;
 858 }
 859
 860 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 861                                   struct kvm_sregs *sregs)
 862 {
 863         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 864         int i;
 865
 866         kvmppc_set_pvr(vcpu, sregs->pvr);
 867
 868         vcpu3s->sdr1 = sregs->u.s.sdr1;
 869         if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) {
 870                 for (i = 0; i < 64; i++) {
 871                         vcpu->arch.mmu.slbmte(vcpu, sregs->u.s.ppc64.slb[i].slbv,
 872                                                     sregs->u.s.ppc64.slb[i].slbe);
 873                 }
 874         } else {
 875                 for (i = 0; i < 16; i++) {
 876                         vcpu->arch.mmu.mtsrin(vcpu, i, sregs->u.s.ppc32.sr[i]);
 877                 }
 878                 for (i = 0; i < 8; i++) {
 879                         kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), false,
 880                                        (u32)sregs->u.s.ppc32.ibat[i]);
 881                         kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), true,
 882                                        (u32)(sregs->u.s.ppc32.ibat[i] >> 32));
 883                         kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), false,
 884                                        (u32)sregs->u.s.ppc32.dbat[i]);
 885                         kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), true,
 886                                        (u32)(sregs->u.s.ppc32.dbat[i] >> 32));
 887                 }
 888         }
 889
 890         /* Flush the MMU after messing with the segments */
 891         kvmppc_mmu_pte_flush(vcpu, 0, 0);
 892
 893         return 0;
 894 }
 895
 896 int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
 897 {
 898         int r = -EINVAL;
 899
 900         switch (reg->id) {
 901         case KVM_REG_PPC_HIOR:
 902                 r = copy_to_user((u64 __user *)(long)reg->addr,
 903                                 &to_book3s(vcpu)->hior, sizeof(u64));
 904                 break;
 905         default:
 906                 break;
 907         }
 908
 909         return r;
 910 }
 911
 912 int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
 913 {
 914         int r = -EINVAL;
 915
 916         switch (reg->id) {
 917         case KVM_REG_PPC_HIOR:
 918                 r = copy_from_user(&to_book3s(vcpu)->hior,
 919                                    (u64 __user *)(long)reg->addr, sizeof(u64));
 920                 if (!r)
 921                         to_book3s(vcpu)->hior_explicit = true;
 922                 break;
 923         default:
 924                 break;
 925         }
 926
 927         return r;
 928 }
 929
 930 int kvmppc_core_check_processor_compat(void)
 931 {
 932         return 0;
 933 }
 934
 935 struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
 936 {
 937         struct kvmppc_vcpu_book3s *vcpu_book3s;
 938         struct kvm_vcpu *vcpu;
 939         int err = -ENOMEM;
 940         unsigned long p;
 941
 942         vcpu_book3s = vzalloc(sizeof(struct kvmppc_vcpu_book3s));
 943         if (!vcpu_book3s)
 944                 goto out;
 945
 946         vcpu_book3s->shadow_vcpu = (struct kvmppc_book3s_shadow_vcpu *)
 947                 kzalloc(sizeof(*vcpu_book3s->shadow_vcpu), GFP_KERNEL);
 948         if (!vcpu_book3s->shadow_vcpu)
 949                 goto free_vcpu;
 950
 951         vcpu = &vcpu_book3s->vcpu;
 952         err = kvm_vcpu_init(vcpu, kvm, id);
 953         if (err)
 954                 goto free_shadow_vcpu;
 955
 956         p = __get_free_page(GFP_KERNEL|__GFP_ZERO);
 957         /* the real shared page fills the last 4k of our page */
 958         vcpu->arch.shared = (void*)(p + PAGE_SIZE - 4096);
 959         if (!p)
 960                 goto uninit_vcpu;
 961
 962 #ifdef CONFIG_PPC_BOOK3S_64
 963         /* default to book3s_64 (970fx) */
 964         vcpu->arch.pvr = 0x3C0301;
 965 #else
 966         /* default to book3s_32 (750) */
 967         vcpu->arch.pvr = 0x84202;
 968 #endif
 969         kvmppc_set_pvr(vcpu, vcpu->arch.pvr);
 970         vcpu->arch.slb_nr = 64;
 971
 972         vcpu->arch.shadow_msr = MSR_USER64;
 973
 974         err = kvmppc_mmu_init(vcpu);
 975         if (err < 0)
 976                 goto uninit_vcpu;
 977
 978         return vcpu;
 979
 980 uninit_vcpu:
 981         kvm_vcpu_uninit(vcpu);
 982 free_shadow_vcpu:
 983         kfree(vcpu_book3s->shadow_vcpu);
 984 free_vcpu:
 985         vfree(vcpu_book3s);
 986 out:
 987         return ERR_PTR(err);
 988 }
 989
 990 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
 991 {
 992         struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
 993
 994         free_page((unsigned long)vcpu->arch.shared & PAGE_MASK);
 995         kvm_vcpu_uninit(vcpu);
 996         kfree(vcpu_book3s->shadow_vcpu);
 997         vfree(vcpu_book3s);
 998 }
 999
1000 int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
1001 {
1002         int ret;
1003         double fpr[32][TS_FPRWIDTH];
1004         unsigned int fpscr;
1005         int fpexc_mode;
1006 #ifdef CONFIG_ALTIVEC
1007         vector128 vr[32];
1008         vector128 vscr;
1009         unsigned long uninitialized_var(vrsave);
1010         int used_vr;
1011 #endif
1012 #ifdef CONFIG_VSX
1013         int used_vsr;
1014 #endif
1015         ulong ext_msr;
1016
1017         preempt_disable();
1018
1019         /* Check if we can run the vcpu at all */
1020         if (!vcpu->arch.sane) {
1021                 kvm_run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1022                 ret = -EINVAL;
1023                 goto out;
1024         }
1025
1026         /*
1027          * Interrupts could be timers for the guest which we have to inject
1028          * again, so let's postpone them until we're in the guest and if we
1029          * really did time things so badly, then we just exit again due to
1030          * a host external interrupt.
1031          */
1032         __hard_irq_disable();
1033         if (kvmppc_prepare_to_enter(vcpu)) {
1034                 __hard_irq_enable();
1035                 kvm_run->exit_reason = KVM_EXIT_INTR;
1036                 ret = -EINTR;
1037                 goto out;
1038         }
1039
1040         /* Save FPU state in stack */
1041         if (current->thread.regs->msr & MSR_FP)
1042                 giveup_fpu(current);
1043         memcpy(fpr, current->thread.fpr, sizeof(current->thread.fpr));
1044         fpscr = current->thread.fpscr.val;
1045         fpexc_mode = current->thread.fpexc_mode;
1046
1047 #ifdef CONFIG_ALTIVEC
1048         /* Save Altivec state in stack */
1049         used_vr = current->thread.used_vr;
1050         if (used_vr) {
1051                 if (current->thread.regs->msr & MSR_VEC)
1052                         giveup_altivec(current);
1053                 memcpy(vr, current->thread.vr, sizeof(current->thread.vr));
1054                 vscr = current->thread.vscr;
1055                 vrsave = current->thread.vrsave;
1056         }
1057 #endif
1058
1059 #ifdef CONFIG_VSX
1060         /* Save VSX state in stack */
1061         used_vsr = current->thread.used_vsr;
1062         if (used_vsr && (current->thread.regs->msr & MSR_VSX))
1063                         __giveup_vsx(current);
1064 #endif
1065
1066         /* Remember the MSR with disabled extensions */
1067         ext_msr = current->thread.regs->msr;
1068
1069         /* Preload FPU if it's enabled */
1070         if (vcpu->arch.shared->msr & MSR_FP)
1071                 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
1072
1073         kvm_guest_enter();
1074
1075         ret = __kvmppc_vcpu_run(kvm_run, vcpu);
1076
1077         kvm_guest_exit();
1078
1079         current->thread.regs->msr = ext_msr;
1080
1081         /* Make sure we save the guest FPU/Altivec/VSX state */
1082         kvmppc_giveup_ext(vcpu, MSR_FP);
1083         kvmppc_giveup_ext(vcpu, MSR_VEC);
1084         kvmppc_giveup_ext(vcpu, MSR_VSX);
1085
1086         /* Restore FPU state from stack */
1087         memcpy(current->thread.fpr, fpr, sizeof(current->thread.fpr));
1088         current->thread.fpscr.val = fpscr;
1089         current->thread.fpexc_mode = fpexc_mode;
1090
1091 #ifdef CONFIG_ALTIVEC
1092         /* Restore Altivec state from stack */
1093         if (used_vr && current->thread.used_vr) {
1094                 memcpy(current->thread.vr, vr, sizeof(current->thread.vr));
1095                 current->thread.vscr = vscr;
1096                 current->thread.vrsave = vrsave;
1097         }
1098         current->thread.used_vr = used_vr;
1099 #endif
1100
1101 #ifdef CONFIG_VSX
1102         current->thread.used_vsr = used_vsr;
1103 #endif
1104
1105 out:
1106         preempt_enable();
1107         return ret;
1108 }
1109
1110 /*
1111  * Get (and clear) the dirty memory log for a memory slot.
1112  */
1113 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
1114                                       struct kvm_dirty_log *log)
1115 {
1116         struct kvm_memory_slot *memslot;
1117         struct kvm_vcpu *vcpu;
1118         ulong ga, ga_end;
1119         int is_dirty = 0;
1120         int r;
1121         unsigned long n;
1122
1123         mutex_lock(&kvm->slots_lock);
1124
1125         r = kvm_get_dirty_log(kvm, log, &is_dirty);
1126         if (r)
1127                 goto out;
1128
1129         /* If nothing is dirty, don't bother messing with page tables. */
1130         if (is_dirty) {
1131                 memslot = id_to_memslot(kvm->memslots, log->slot);
1132
1133                 ga = memslot->base_gfn << PAGE_SHIFT;
1134                 ga_end = ga + (memslot->npages << PAGE_SHIFT);
1135
1136                 kvm_for_each_vcpu(n, vcpu, kvm)
1137                         kvmppc_mmu_pte_pflush(vcpu, ga, ga_end);
1138
1139                 n = kvm_dirty_bitmap_bytes(memslot);
1140                 memset(memslot->dirty_bitmap, 0, n);
1141         }
1142
1143         r = 0;
1144 out:
1145         mutex_unlock(&kvm->slots_lock);
1146         return r;
1147 }
1148
1149 #ifdef CONFIG_PPC64
1150 int kvm_vm_ioctl_get_smmu_info(struct kvm *kvm, struct kvm_ppc_smmu_info *info)
1151 {
1152         /* No flags */
1153         info->flags = 0;
1154
1155         /* SLB is always 64 entries */
1156         info->slb_size = 64;
1157
1158         /* Standard 4k base page size segment */
1159         info->sps[0].page_shift = 12;
1160         info->sps[0].slb_enc = 0;
1161         info->sps[0].enc[0].page_shift = 12;
1162         info->sps[0].enc[0].pte_enc = 0;
1163
1164         /* Standard 16M large page size segment */
1165         info->sps[1].page_shift = 24;
1166         info->sps[1].slb_enc = SLB_VSID_L;
1167         info->sps[1].enc[0].page_shift = 24;
1168         info->sps[1].enc[0].pte_enc = 0;
1169
1170         return 0;
1171 }
1172 #endif /* CONFIG_PPC64 */
1173
1174 int kvmppc_core_prepare_memory_region(struct kvm *kvm,
1175                                       struct kvm_userspace_memory_region *mem)
1176 {
1177         return 0;
1178 }
1179
1180 void kvmppc_core_commit_memory_region(struct kvm *kvm,
1181                                 struct kvm_userspace_memory_region *mem)
1182 {
1183 }
1184
1185 int kvmppc_core_init_vm(struct kvm *kvm)
1186 {
1187 #ifdef CONFIG_PPC64
1188         INIT_LIST_HEAD(&kvm->arch.spapr_tce_tables);
1189 #endif
1190
1191         return 0;
1192 }
1193
1194 void kvmppc_core_destroy_vm(struct kvm *kvm)
1195 {
1196 #ifdef CONFIG_PPC64
1197         WARN_ON(!list_empty(&kvm->arch.spapr_tce_tables));
1198 #endif
1199 }
1200
1201 static int kvmppc_book3s_init(void)
1202 {
1203         int r;
1204
1205         r = kvm_init(NULL, sizeof(struct kvmppc_vcpu_book3s), 0,
1206                      THIS_MODULE);
1207
1208         if (r)
1209                 return r;
1210
1211         r = kvmppc_mmu_hpte_sysinit();
1212
1213         return r;
1214 }
1215
1216 static void kvmppc_book3s_exit(void)
1217 {
1218         kvmppc_mmu_hpte_sysexit();
1219         kvm_exit();
1220 }
1221
1222 module_init(kvmppc_book3s_init);
1223 module_exit(kvmppc_book3s_exit);