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 <asm/firmware.h>
  38 #include <asm/hvcall.h>
  39 #include <linux/gfp.h>
  40 #include <linux/sched.h>
  41 #include <linux/vmalloc.h>
  42 #include <linux/highmem.h>
  43
  44 #include "trace.h"
  45
  46 /* #define EXIT_DEBUG */
  47 /* #define DEBUG_EXT */
  48
  49 static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
  50                              ulong msr);
  51
  52 /* Some compatibility defines */
  53 #ifdef CONFIG_PPC_BOOK3S_32
  54 #define MSR_USER32 MSR_USER
  55 #define MSR_USER64 MSR_USER
  56 #define HW_PAGE_SIZE PAGE_SIZE
  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         vcpu->cpu = smp_processor_id();
  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 | MSR_VEC | MSR_VSX);
  87         vcpu->cpu = -1;
  88 }
  89
  90 int kvmppc_core_check_requests(struct kvm_vcpu *vcpu)
  91 {
  92         int r = 1; /* Indicate we want to get back into the guest */
  93
  94         /* We misuse TLB_FLUSH to indicate that we want to clear
  95            all shadow cache entries */
  96         if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu))
  97                 kvmppc_mmu_pte_flush(vcpu, 0, 0);
  98
  99         return r;
 100 }
 101
 102 /************* MMU Notifiers *************/
 103
 104 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva)
 105 {
 106         trace_kvm_unmap_hva(hva);
 107
 108         /*
 109          * Flush all shadow tlb entries everywhere. This is slow, but
 110          * we are 100% sure that we catch the to be unmapped page
 111          */
 112         kvm_flush_remote_tlbs(kvm);
 113
 114         return 0;
 115 }
 116
 117 int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end)
 118 {
 119         /* kvm_unmap_hva flushes everything anyways */
 120         kvm_unmap_hva(kvm, start);
 121
 122         return 0;
 123 }
 124
 125 int kvm_age_hva(struct kvm *kvm, unsigned long hva)
 126 {
 127         /* XXX could be more clever ;) */
 128         return 0;
 129 }
 130
 131 int kvm_test_age_hva(struct kvm *kvm, unsigned long hva)
 132 {
 133         /* XXX could be more clever ;) */
 134         return 0;
 135 }
 136
 137 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte)
 138 {
 139         /* The page will get remapped properly on its next fault */
 140         kvm_unmap_hva(kvm, hva);
 141 }
 142
 143 /*****************************************/
 144
 145 static void kvmppc_recalc_shadow_msr(struct kvm_vcpu *vcpu)
 146 {
 147         ulong smsr = vcpu->arch.shared->msr;
 148
 149         /* Guest MSR values */
 150         smsr &= MSR_FE0 | MSR_FE1 | MSR_SF | MSR_SE | MSR_BE;
 151         /* Process MSR values */
 152         smsr |= MSR_ME | MSR_RI | MSR_IR | MSR_DR | MSR_PR | MSR_EE;
 153         /* External providers the guest reserved */
 154         smsr |= (vcpu->arch.shared->msr & vcpu->arch.guest_owned_ext);
 155         /* 64-bit Process MSR values */
 156 #ifdef CONFIG_PPC_BOOK3S_64
 157         smsr |= MSR_ISF | MSR_HV;
 158 #endif
 159         vcpu->arch.shadow_msr = smsr;
 160 }
 161
 162 void kvmppc_set_msr(struct kvm_vcpu *vcpu, u64 msr)
 163 {
 164         ulong old_msr = vcpu->arch.shared->msr;
 165
 166 #ifdef EXIT_DEBUG
 167         printk(KERN_INFO "KVM: Set MSR to 0x%llx\n", msr);
 168 #endif
 169
 170         msr &= to_book3s(vcpu)->msr_mask;
 171         vcpu->arch.shared->msr = msr;
 172         kvmppc_recalc_shadow_msr(vcpu);
 173
 174         if (msr & MSR_POW) {
 175                 if (!vcpu->arch.pending_exceptions) {
 176                         kvm_vcpu_block(vcpu);
 177                         clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
 178                         vcpu->stat.halt_wakeup++;
 179
 180                         /* Unset POW bit after we woke up */
 181                         msr &= ~MSR_POW;
 182                         vcpu->arch.shared->msr = msr;
 183                 }
 184         }
 185
 186         if ((vcpu->arch.shared->msr & (MSR_PR|MSR_IR|MSR_DR)) !=
 187                    (old_msr & (MSR_PR|MSR_IR|MSR_DR))) {
 188                 kvmppc_mmu_flush_segments(vcpu);
 189                 kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
 190
 191                 /* Preload magic page segment when in kernel mode */
 192                 if (!(msr & MSR_PR) && vcpu->arch.magic_page_pa) {
 193                         struct kvm_vcpu_arch *a = &vcpu->arch;
 194
 195                         if (msr & MSR_DR)
 196                                 kvmppc_mmu_map_segment(vcpu, a->magic_page_ea);
 197                         else
 198                                 kvmppc_mmu_map_segment(vcpu, a->magic_page_pa);
 199                 }
 200         }
 201
 202         /*
 203          * When switching from 32 to 64-bit, we may have a stale 32-bit
 204          * magic page around, we need to flush it. Typically 32-bit magic
 205          * page will be instanciated when calling into RTAS. Note: We
 206          * assume that such transition only happens while in kernel mode,
 207          * ie, we never transition from user 32-bit to kernel 64-bit with
 208          * a 32-bit magic page around.
 209          */
 210         if (vcpu->arch.magic_page_pa &&
 211             !(old_msr & MSR_PR) && !(old_msr & MSR_SF) && (msr & MSR_SF)) {
 212                 /* going from RTAS to normal kernel code */
 213                 kvmppc_mmu_pte_flush(vcpu, (uint32_t)vcpu->arch.magic_page_pa,
 214                                      ~0xFFFUL);
 215         }
 216
 217         /* Preload FPU if it's enabled */
 218         if (vcpu->arch.shared->msr & MSR_FP)
 219                 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
 220 }
 221
 222 void kvmppc_set_pvr(struct kvm_vcpu *vcpu, u32 pvr)
 223 {
 224         u32 host_pvr;
 225
 226         vcpu->arch.hflags &= ~BOOK3S_HFLAG_SLB;
 227         vcpu->arch.pvr = pvr;
 228 #ifdef CONFIG_PPC_BOOK3S_64
 229         if ((pvr >= 0x330000) && (pvr < 0x70330000)) {
 230                 kvmppc_mmu_book3s_64_init(vcpu);
 231                 if (!to_book3s(vcpu)->hior_explicit)
 232                         to_book3s(vcpu)->hior = 0xfff00000;
 233                 to_book3s(vcpu)->msr_mask = 0xffffffffffffffffULL;
 234                 vcpu->arch.cpu_type = KVM_CPU_3S_64;
 235         } else
 236 #endif
 237         {
 238                 kvmppc_mmu_book3s_32_init(vcpu);
 239                 if (!to_book3s(vcpu)->hior_explicit)
 240                         to_book3s(vcpu)->hior = 0;
 241                 to_book3s(vcpu)->msr_mask = 0xffffffffULL;
 242                 vcpu->arch.cpu_type = KVM_CPU_3S_32;
 243         }
 244
 245         kvmppc_sanity_check(vcpu);
 246
 247         /* If we are in hypervisor level on 970, we can tell the CPU to
 248          * treat DCBZ as 32 bytes store */
 249         vcpu->arch.hflags &= ~BOOK3S_HFLAG_DCBZ32;
 250         if (vcpu->arch.mmu.is_dcbz32(vcpu) && (mfmsr() & MSR_HV) &&
 251             !strcmp(cur_cpu_spec->platform, "ppc970"))
 252                 vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
 253
 254         /* Cell performs badly if MSR_FEx are set. So let's hope nobody
 255            really needs them in a VM on Cell and force disable them. */
 256         if (!strcmp(cur_cpu_spec->platform, "ppc-cell-be"))
 257                 to_book3s(vcpu)->msr_mask &= ~(MSR_FE0 | MSR_FE1);
 258
 259 #ifdef CONFIG_PPC_BOOK3S_32
 260         /* 32 bit Book3S always has 32 byte dcbz */
 261         vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
 262 #endif
 263
 264         /* On some CPUs we can execute paired single operations natively */
 265         asm ( "mfpvr %0" : "=r"(host_pvr));
 266         switch (host_pvr) {
 267         case 0x00080200:        /* lonestar 2.0 */
 268         case 0x00088202:        /* lonestar 2.2 */
 269         case 0x70000100:        /* gekko 1.0 */
 270         case 0x00080100:        /* gekko 2.0 */
 271         case 0x00083203:        /* gekko 2.3a */
 272         case 0x00083213:        /* gekko 2.3b */
 273         case 0x00083204:        /* gekko 2.4 */
 274         case 0x00083214:        /* gekko 2.4e (8SE) - retail HW2 */
 275         case 0x00087200:        /* broadway */
 276                 vcpu->arch.hflags |= BOOK3S_HFLAG_NATIVE_PS;
 277                 /* Enable HID2.PSE - in case we need it later */
 278                 mtspr(SPRN_HID2_GEKKO, mfspr(SPRN_HID2_GEKKO) | (1 << 29));
 279         }
 280 }
 281
 282 /* Book3s_32 CPUs always have 32 bytes cache line size, which Linux assumes. To
 283  * make Book3s_32 Linux work on Book3s_64, we have to make sure we trap dcbz to
 284  * emulate 32 bytes dcbz length.
 285  *
 286  * The Book3s_64 inventors also realized this case and implemented a special bit
 287  * in the HID5 register, which is a hypervisor ressource. Thus we can't use it.
 288  *
 289  * My approach here is to patch the dcbz instruction on executing pages.
 290  */
 291 static void kvmppc_patch_dcbz(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
 292 {
 293         struct page *hpage;
 294         u64 hpage_offset;
 295         u32 *page;
 296         int i;
 297
 298         hpage = gfn_to_page(vcpu->kvm, pte->raddr >> PAGE_SHIFT);
 299         if (is_error_page(hpage))
 300                 return;
 301
 302         hpage_offset = pte->raddr & ~PAGE_MASK;
 303         hpage_offset &= ~0xFFFULL;
 304         hpage_offset /= 4;
 305
 306         get_page(hpage);
 307         page = kmap_atomic(hpage);
 308
 309         /* patch dcbz into reserved instruction, so we trap */
 310         for (i=hpage_offset; i < hpage_offset + (HW_PAGE_SIZE / 4); i++)
 311                 if ((page[i] & 0xff0007ff) == INS_DCBZ)
 312                         page[i] &= 0xfffffff7;
 313
 314         kunmap_atomic(page);
 315         put_page(hpage);
 316 }
 317
 318 static int kvmppc_visible_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
 319 {
 320         ulong mp_pa = vcpu->arch.magic_page_pa;
 321
 322         if (!(vcpu->arch.shared->msr & MSR_SF))
 323                 mp_pa = (uint32_t)mp_pa;
 324
 325         if (unlikely(mp_pa) &&
 326             unlikely((mp_pa & KVM_PAM) >> PAGE_SHIFT == gfn)) {
 327                 return 1;
 328         }
 329
 330         return kvm_is_visible_gfn(vcpu->kvm, gfn);
 331 }
 332
 333 int kvmppc_handle_pagefault(struct kvm_run *run, struct kvm_vcpu *vcpu,
 334                             ulong eaddr, int vec)
 335 {
 336         bool data = (vec == BOOK3S_INTERRUPT_DATA_STORAGE);
 337         int r = RESUME_GUEST;
 338         int relocated;
 339         int page_found = 0;
 340         struct kvmppc_pte pte;
 341         bool is_mmio = false;
 342         bool dr = (vcpu->arch.shared->msr & MSR_DR) ? true : false;
 343         bool ir = (vcpu->arch.shared->msr & MSR_IR) ? true : false;
 344         u64 vsid;
 345
 346         relocated = data ? dr : ir;
 347
 348         /* Resolve real address if translation turned on */
 349         if (relocated) {
 350                 page_found = vcpu->arch.mmu.xlate(vcpu, eaddr, &pte, data);
 351         } else {
 352                 pte.may_execute = true;
 353                 pte.may_read = true;
 354                 pte.may_write = true;
 355                 pte.raddr = eaddr & KVM_PAM;
 356                 pte.eaddr = eaddr;
 357                 pte.vpage = eaddr >> 12;
 358         }
 359
 360         switch (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) {
 361         case 0:
 362                 pte.vpage |= ((u64)VSID_REAL << (SID_SHIFT - 12));
 363                 break;
 364         case MSR_DR:
 365         case MSR_IR:
 366                 vcpu->arch.mmu.esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid);
 367
 368                 if ((vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) == MSR_DR)
 369                         pte.vpage |= ((u64)VSID_REAL_DR << (SID_SHIFT - 12));
 370                 else
 371                         pte.vpage |= ((u64)VSID_REAL_IR << (SID_SHIFT - 12));
 372                 pte.vpage |= vsid;
 373
 374                 if (vsid == -1)
 375                         page_found = -EINVAL;
 376                 break;
 377         }
 378
 379         if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
 380            (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
 381                 /*
 382                  * If we do the dcbz hack, we have to NX on every execution,
 383                  * so we can patch the executing code. This renders our guest
 384                  * NX-less.
 385                  */
 386                 pte.may_execute = !data;
 387         }
 388
 389         if (page_found == -ENOENT) {
 390                 /* Page not found in guest PTE entries */
 391                 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 392                 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
 393                 vcpu->arch.shared->dsisr = svcpu->fault_dsisr;
 394                 vcpu->arch.shared->msr |=
 395                         (svcpu->shadow_srr1 & 0x00000000f8000000ULL);
 396                 svcpu_put(svcpu);
 397                 kvmppc_book3s_queue_irqprio(vcpu, vec);
 398         } else if (page_found == -EPERM) {
 399                 /* Storage protection */
 400                 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 401                 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
 402                 vcpu->arch.shared->dsisr = svcpu->fault_dsisr & ~DSISR_NOHPTE;
 403                 vcpu->arch.shared->dsisr |= DSISR_PROTFAULT;
 404                 vcpu->arch.shared->msr |=
 405                         svcpu->shadow_srr1 & 0x00000000f8000000ULL;
 406                 svcpu_put(svcpu);
 407                 kvmppc_book3s_queue_irqprio(vcpu, vec);
 408         } else if (page_found == -EINVAL) {
 409                 /* Page not found in guest SLB */
 410                 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
 411                 kvmppc_book3s_queue_irqprio(vcpu, vec + 0x80);
 412         } else if (!is_mmio &&
 413                    kvmppc_visible_gfn(vcpu, pte.raddr >> PAGE_SHIFT)) {
 414                 /* The guest's PTE is not mapped yet. Map on the host */
 415                 kvmppc_mmu_map_page(vcpu, &pte);
 416                 if (data)
 417                         vcpu->stat.sp_storage++;
 418                 else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
 419                         (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32)))
 420                         kvmppc_patch_dcbz(vcpu, &pte);
 421         } else {
 422                 /* MMIO */
 423                 vcpu->stat.mmio_exits++;
 424                 vcpu->arch.paddr_accessed = pte.raddr;
 425                 vcpu->arch.vaddr_accessed = pte.eaddr;
 426                 r = kvmppc_emulate_mmio(run, vcpu);
 427                 if ( r == RESUME_HOST_NV )
 428                         r = RESUME_HOST;
 429         }
 430
 431         return r;
 432 }
 433
 434 static inline int get_fpr_index(int i)
 435 {
 436         return i * TS_FPRWIDTH;
 437 }
 438
 439 /* Give up external provider (FPU, Altivec, VSX) */
 440 void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr)
 441 {
 442         struct thread_struct *t = &current->thread;
 443         u64 *vcpu_fpr = vcpu->arch.fpr;
 444 #ifdef CONFIG_VSX
 445         u64 *vcpu_vsx = vcpu->arch.vsr;
 446 #endif
 447         u64 *thread_fpr = (u64*)t->fpr;
 448         int i;
 449
 450         /*
 451          * VSX instructions can access FP and vector registers, so if
 452          * we are giving up VSX, make sure we give up FP and VMX as well.
 453          */
 454         if (msr & MSR_VSX)
 455                 msr |= MSR_FP | MSR_VEC;
 456
 457         msr &= vcpu->arch.guest_owned_ext;
 458         if (!msr)
 459                 return;
 460
 461 #ifdef DEBUG_EXT
 462         printk(KERN_INFO "Giving up ext 0x%lx\n", msr);
 463 #endif
 464
 465         if (msr & MSR_FP) {
 466                 /*
 467                  * Note that on CPUs with VSX, giveup_fpu stores
 468                  * both the traditional FP registers and the added VSX
 469                  * registers into thread.fpr[].
 470                  */
 471                 giveup_fpu(current);
 472                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++)
 473                         vcpu_fpr[i] = thread_fpr[get_fpr_index(i)];
 474
 475                 vcpu->arch.fpscr = t->fpscr.val;
 476
 477 #ifdef CONFIG_VSX
 478                 if (cpu_has_feature(CPU_FTR_VSX))
 479                         for (i = 0; i < ARRAY_SIZE(vcpu->arch.vsr) / 2; i++)
 480                                 vcpu_vsx[i] = thread_fpr[get_fpr_index(i) + 1];
 481 #endif
 482         }
 483
 484 #ifdef CONFIG_ALTIVEC
 485         if (msr & MSR_VEC) {
 486                 giveup_altivec(current);
 487                 memcpy(vcpu->arch.vr, t->vr, sizeof(vcpu->arch.vr));
 488                 vcpu->arch.vscr = t->vscr;
 489         }
 490 #endif
 491
 492         vcpu->arch.guest_owned_ext &= ~(msr | MSR_VSX);
 493         kvmppc_recalc_shadow_msr(vcpu);
 494 }
 495
 496 static int kvmppc_read_inst(struct kvm_vcpu *vcpu)
 497 {
 498         ulong srr0 = kvmppc_get_pc(vcpu);
 499         u32 last_inst = kvmppc_get_last_inst(vcpu);
 500         int ret;
 501
 502         ret = kvmppc_ld(vcpu, &srr0, sizeof(u32), &last_inst, false);
 503         if (ret == -ENOENT) {
 504                 ulong msr = vcpu->arch.shared->msr;
 505
 506                 msr = kvmppc_set_field(msr, 33, 33, 1);
 507                 msr = kvmppc_set_field(msr, 34, 36, 0);
 508                 vcpu->arch.shared->msr = kvmppc_set_field(msr, 42, 47, 0);
 509                 kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_INST_STORAGE);
 510                 return EMULATE_AGAIN;
 511         }
 512
 513         return EMULATE_DONE;
 514 }
 515
 516 static int kvmppc_check_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr)
 517 {
 518
 519         /* Need to do paired single emulation? */
 520         if (!(vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE))
 521                 return EMULATE_DONE;
 522
 523         /* Read out the instruction */
 524         if (kvmppc_read_inst(vcpu) == EMULATE_DONE)
 525                 /* Need to emulate */
 526                 return EMULATE_FAIL;
 527
 528         return EMULATE_AGAIN;
 529 }
 530
 531 /* Handle external providers (FPU, Altivec, VSX) */
 532 static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
 533                              ulong msr)
 534 {
 535         struct thread_struct *t = &current->thread;
 536         u64 *vcpu_fpr = vcpu->arch.fpr;
 537 #ifdef CONFIG_VSX
 538         u64 *vcpu_vsx = vcpu->arch.vsr;
 539 #endif
 540         u64 *thread_fpr = (u64*)t->fpr;
 541         int i;
 542
 543         /* When we have paired singles, we emulate in software */
 544         if (vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE)
 545                 return RESUME_GUEST;
 546
 547         if (!(vcpu->arch.shared->msr & msr)) {
 548                 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 549                 return RESUME_GUEST;
 550         }
 551
 552         if (msr == MSR_VSX) {
 553                 /* No VSX?  Give an illegal instruction interrupt */
 554 #ifdef CONFIG_VSX
 555                 if (!cpu_has_feature(CPU_FTR_VSX))
 556 #endif
 557                 {
 558                         kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
 559                         return RESUME_GUEST;
 560                 }
 561
 562                 /*
 563                  * We have to load up all the FP and VMX registers before
 564                  * we can let the guest use VSX instructions.
 565                  */
 566                 msr = MSR_FP | MSR_VEC | MSR_VSX;
 567         }
 568
 569         /* See if we already own all the ext(s) needed */
 570         msr &= ~vcpu->arch.guest_owned_ext;
 571         if (!msr)
 572                 return RESUME_GUEST;
 573
 574 #ifdef DEBUG_EXT
 575         printk(KERN_INFO "Loading up ext 0x%lx\n", msr);
 576 #endif
 577
 578         current->thread.regs->msr |= msr;
 579
 580         if (msr & MSR_FP) {
 581                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++)
 582                         thread_fpr[get_fpr_index(i)] = vcpu_fpr[i];
 583 #ifdef CONFIG_VSX
 584                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.vsr) / 2; i++)
 585                         thread_fpr[get_fpr_index(i) + 1] = vcpu_vsx[i];
 586 #endif
 587                 t->fpscr.val = vcpu->arch.fpscr;
 588                 t->fpexc_mode = 0;
 589                 kvmppc_load_up_fpu();
 590         }
 591
 592         if (msr & MSR_VEC) {
 593 #ifdef CONFIG_ALTIVEC
 594                 memcpy(t->vr, vcpu->arch.vr, sizeof(vcpu->arch.vr));
 595                 t->vscr = vcpu->arch.vscr;
 596                 t->vrsave = -1;
 597                 kvmppc_load_up_altivec();
 598 #endif
 599         }
 600
 601         vcpu->arch.guest_owned_ext |= msr;
 602         kvmppc_recalc_shadow_msr(vcpu);
 603
 604         return RESUME_GUEST;
 605 }
 606
 607 int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
 608                        unsigned int exit_nr)
 609 {
 610         int r = RESUME_HOST;
 611         int s;
 612
 613         vcpu->stat.sum_exits++;
 614
 615         run->exit_reason = KVM_EXIT_UNKNOWN;
 616         run->ready_for_interrupt_injection = 1;
 617
 618         /* We get here with MSR.EE=1 */
 619
 620         trace_kvm_exit(exit_nr, vcpu);
 621         kvm_guest_exit();
 622
 623         switch (exit_nr) {
 624         case BOOK3S_INTERRUPT_INST_STORAGE:
 625         {
 626                 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 627                 ulong shadow_srr1 = svcpu->shadow_srr1;
 628                 vcpu->stat.pf_instruc++;
 629
 630 #ifdef CONFIG_PPC_BOOK3S_32
 631                 /* We set segments as unused segments when invalidating them. So
 632                  * treat the respective fault as segment fault. */
 633                 if (svcpu->sr[kvmppc_get_pc(vcpu) >> SID_SHIFT] == SR_INVALID) {
 634                         kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
 635                         r = RESUME_GUEST;
 636                         svcpu_put(svcpu);
 637                         break;
 638                 }
 639 #endif
 640                 svcpu_put(svcpu);
 641
 642                 /* only care about PTEG not found errors, but leave NX alone */
 643                 if (shadow_srr1 & 0x40000000) {
 644                         r = kvmppc_handle_pagefault(run, vcpu, kvmppc_get_pc(vcpu), exit_nr);
 645                         vcpu->stat.sp_instruc++;
 646                 } else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
 647                           (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
 648                         /*
 649                          * XXX If we do the dcbz hack we use the NX bit to flush&patch the page,
 650                          *     so we can't use the NX bit inside the guest. Let's cross our fingers,
 651                          *     that no guest that needs the dcbz hack does NX.
 652                          */
 653                         kvmppc_mmu_pte_flush(vcpu, kvmppc_get_pc(vcpu), ~0xFFFUL);
 654                         r = RESUME_GUEST;
 655                 } else {
 656                         vcpu->arch.shared->msr |= shadow_srr1 & 0x58000000;
 657                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 658                         r = RESUME_GUEST;
 659                 }
 660                 break;
 661         }
 662         case BOOK3S_INTERRUPT_DATA_STORAGE:
 663         {
 664                 ulong dar = kvmppc_get_fault_dar(vcpu);
 665                 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 666                 u32 fault_dsisr = svcpu->fault_dsisr;
 667                 vcpu->stat.pf_storage++;
 668
 669 #ifdef CONFIG_PPC_BOOK3S_32
 670                 /* We set segments as unused segments when invalidating them. So
 671                  * treat the respective fault as segment fault. */
 672                 if ((svcpu->sr[dar >> SID_SHIFT]) == SR_INVALID) {
 673                         kvmppc_mmu_map_segment(vcpu, dar);
 674                         r = RESUME_GUEST;
 675                         svcpu_put(svcpu);
 676                         break;
 677                 }
 678 #endif
 679                 svcpu_put(svcpu);
 680
 681                 /* The only case we need to handle is missing shadow PTEs */
 682                 if (fault_dsisr & DSISR_NOHPTE) {
 683                         r = kvmppc_handle_pagefault(run, vcpu, dar, exit_nr);
 684                 } else {
 685                         vcpu->arch.shared->dar = dar;
 686                         vcpu->arch.shared->dsisr = fault_dsisr;
 687                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 688                         r = RESUME_GUEST;
 689                 }
 690                 break;
 691         }
 692         case BOOK3S_INTERRUPT_DATA_SEGMENT:
 693                 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_fault_dar(vcpu)) < 0) {
 694                         vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
 695                         kvmppc_book3s_queue_irqprio(vcpu,
 696                                 BOOK3S_INTERRUPT_DATA_SEGMENT);
 697                 }
 698                 r = RESUME_GUEST;
 699                 break;
 700         case BOOK3S_INTERRUPT_INST_SEGMENT:
 701                 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu)) < 0) {
 702                         kvmppc_book3s_queue_irqprio(vcpu,
 703                                 BOOK3S_INTERRUPT_INST_SEGMENT);
 704                 }
 705                 r = RESUME_GUEST;
 706                 break;
 707         /* We're good on these - the host merely wanted to get our attention */
 708         case BOOK3S_INTERRUPT_DECREMENTER:
 709         case BOOK3S_INTERRUPT_HV_DECREMENTER:
 710                 vcpu->stat.dec_exits++;
 711                 r = RESUME_GUEST;
 712                 break;
 713         case BOOK3S_INTERRUPT_EXTERNAL:
 714         case BOOK3S_INTERRUPT_EXTERNAL_LEVEL:
 715         case BOOK3S_INTERRUPT_EXTERNAL_HV:
 716                 vcpu->stat.ext_intr_exits++;
 717                 r = RESUME_GUEST;
 718                 break;
 719         case BOOK3S_INTERRUPT_PERFMON:
 720                 r = RESUME_GUEST;
 721                 break;
 722         case BOOK3S_INTERRUPT_PROGRAM:
 723         case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
 724         {
 725                 enum emulation_result er;
 726                 struct kvmppc_book3s_shadow_vcpu *svcpu;
 727                 ulong flags;
 728
 729 program_interrupt:
 730                 svcpu = svcpu_get(vcpu);
 731                 flags = svcpu->shadow_srr1 & 0x1f0000ull;
 732                 svcpu_put(svcpu);
 733
 734                 if (vcpu->arch.shared->msr & MSR_PR) {
 735 #ifdef EXIT_DEBUG
 736                         printk(KERN_INFO "Userspace triggered 0x700 exception at 0x%lx (0x%x)\n", kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu));
 737 #endif
 738                         if ((kvmppc_get_last_inst(vcpu) & 0xff0007ff) !=
 739                             (INS_DCBZ & 0xfffffff7)) {
 740                                 kvmppc_core_queue_program(vcpu, flags);
 741                                 r = RESUME_GUEST;
 742                                 break;
 743                         }
 744                 }
 745
 746                 vcpu->stat.emulated_inst_exits++;
 747                 er = kvmppc_emulate_instruction(run, vcpu);
 748                 switch (er) {
 749                 case EMULATE_DONE:
 750                         r = RESUME_GUEST_NV;
 751                         break;
 752                 case EMULATE_AGAIN:
 753                         r = RESUME_GUEST;
 754                         break;
 755                 case EMULATE_FAIL:
 756                         printk(KERN_CRIT "%s: emulation at %lx failed (%08x)\n",
 757                                __func__, kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu));
 758                         kvmppc_core_queue_program(vcpu, flags);
 759                         r = RESUME_GUEST;
 760                         break;
 761                 case EMULATE_DO_MMIO:
 762                         run->exit_reason = KVM_EXIT_MMIO;
 763                         r = RESUME_HOST_NV;
 764                         break;
 765                 case EMULATE_EXIT_USER:
 766                         r = RESUME_HOST_NV;
 767                         break;
 768                 default:
 769                         BUG();
 770                 }
 771                 break;
 772         }
 773         case BOOK3S_INTERRUPT_SYSCALL:
 774                 if (vcpu->arch.papr_enabled &&
 775                     (kvmppc_get_last_inst(vcpu) == 0x44000022) &&
 776                     !(vcpu->arch.shared->msr & MSR_PR)) {
 777                         /* SC 1 papr hypercalls */
 778                         ulong cmd = kvmppc_get_gpr(vcpu, 3);
 779                         int i;
 780
 781 #ifdef CONFIG_KVM_BOOK3S_64_PR
 782                         if (kvmppc_h_pr(vcpu, cmd) == EMULATE_DONE) {
 783                                 r = RESUME_GUEST;
 784                                 break;
 785                         }
 786 #endif
 787
 788                         run->papr_hcall.nr = cmd;
 789                         for (i = 0; i < 9; ++i) {
 790                                 ulong gpr = kvmppc_get_gpr(vcpu, 4 + i);
 791                                 run->papr_hcall.args[i] = gpr;
 792                         }
 793                         run->exit_reason = KVM_EXIT_PAPR_HCALL;
 794                         vcpu->arch.hcall_needed = 1;
 795                         r = RESUME_HOST;
 796                 } else if (vcpu->arch.osi_enabled &&
 797                     (((u32)kvmppc_get_gpr(vcpu, 3)) == OSI_SC_MAGIC_R3) &&
 798                     (((u32)kvmppc_get_gpr(vcpu, 4)) == OSI_SC_MAGIC_R4)) {
 799                         /* MOL hypercalls */
 800                         u64 *gprs = run->osi.gprs;
 801                         int i;
 802
 803                         run->exit_reason = KVM_EXIT_OSI;
 804                         for (i = 0; i < 32; i++)
 805                                 gprs[i] = kvmppc_get_gpr(vcpu, i);
 806                         vcpu->arch.osi_needed = 1;
 807                         r = RESUME_HOST_NV;
 808                 } else if (!(vcpu->arch.shared->msr & MSR_PR) &&
 809                     (((u32)kvmppc_get_gpr(vcpu, 0)) == KVM_SC_MAGIC_R0)) {
 810                         /* KVM PV hypercalls */
 811                         kvmppc_set_gpr(vcpu, 3, kvmppc_kvm_pv(vcpu));
 812                         r = RESUME_GUEST;
 813                 } else {
 814                         /* Guest syscalls */
 815                         vcpu->stat.syscall_exits++;
 816                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 817                         r = RESUME_GUEST;
 818                 }
 819                 break;
 820         case BOOK3S_INTERRUPT_FP_UNAVAIL:
 821         case BOOK3S_INTERRUPT_ALTIVEC:
 822         case BOOK3S_INTERRUPT_VSX:
 823         {
 824                 int ext_msr = 0;
 825
 826                 switch (exit_nr) {
 827                 case BOOK3S_INTERRUPT_FP_UNAVAIL: ext_msr = MSR_FP;  break;
 828                 case BOOK3S_INTERRUPT_ALTIVEC:    ext_msr = MSR_VEC; break;
 829                 case BOOK3S_INTERRUPT_VSX:        ext_msr = MSR_VSX; break;
 830                 }
 831
 832                 switch (kvmppc_check_ext(vcpu, exit_nr)) {
 833                 case EMULATE_DONE:
 834                         /* everything ok - let's enable the ext */
 835                         r = kvmppc_handle_ext(vcpu, exit_nr, ext_msr);
 836                         break;
 837                 case EMULATE_FAIL:
 838                         /* we need to emulate this instruction */
 839                         goto program_interrupt;
 840                         break;
 841                 default:
 842                         /* nothing to worry about - go again */
 843                         break;
 844                 }
 845                 break;
 846         }
 847         case BOOK3S_INTERRUPT_ALIGNMENT:
 848                 if (kvmppc_read_inst(vcpu) == EMULATE_DONE) {
 849                         vcpu->arch.shared->dsisr = kvmppc_alignment_dsisr(vcpu,
 850                                 kvmppc_get_last_inst(vcpu));
 851                         vcpu->arch.shared->dar = kvmppc_alignment_dar(vcpu,
 852                                 kvmppc_get_last_inst(vcpu));
 853                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 854                 }
 855                 r = RESUME_GUEST;
 856                 break;
 857         case BOOK3S_INTERRUPT_MACHINE_CHECK:
 858         case BOOK3S_INTERRUPT_TRACE:
 859                 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 860                 r = RESUME_GUEST;
 861                 break;
 862         default:
 863         {
 864                 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 865                 ulong shadow_srr1 = svcpu->shadow_srr1;
 866                 svcpu_put(svcpu);
 867                 /* Ugh - bork here! What did we get? */
 868                 printk(KERN_EMERG "exit_nr=0x%x | pc=0x%lx | msr=0x%lx\n",
 869                         exit_nr, kvmppc_get_pc(vcpu), shadow_srr1);
 870                 r = RESUME_HOST;
 871                 BUG();
 872                 break;
 873         }
 874         }
 875
 876         if (!(r & RESUME_HOST)) {
 877                 /* To avoid clobbering exit_reason, only check for signals if
 878                  * we aren't already exiting to userspace for some other
 879                  * reason. */
 880
 881                 /*
 882                  * Interrupts could be timers for the guest which we have to
 883                  * inject again, so let's postpone them until we're in the guest
 884                  * and if we really did time things so badly, then we just exit
 885                  * again due to a host external interrupt.
 886                  */
 887                 local_irq_disable();
 888                 s = kvmppc_prepare_to_enter(vcpu);
 889                 if (s <= 0) {
 890                         local_irq_enable();
 891                         r = s;
 892                 } else {
 893                         kvmppc_lazy_ee_enable();
 894                 }
 895         }
 896
 897         trace_kvm_book3s_reenter(r, vcpu);
 898
 899         return r;
 900 }
 901
 902 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 903                                   struct kvm_sregs *sregs)
 904 {
 905         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 906         int i;
 907
 908         sregs->pvr = vcpu->arch.pvr;
 909
 910         sregs->u.s.sdr1 = to_book3s(vcpu)->sdr1;
 911         if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) {
 912                 for (i = 0; i < 64; i++) {
 913                         sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige | i;
 914                         sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
 915                 }
 916         } else {
 917                 for (i = 0; i < 16; i++)
 918                         sregs->u.s.ppc32.sr[i] = vcpu->arch.shared->sr[i];
 919
 920                 for (i = 0; i < 8; i++) {
 921                         sregs->u.s.ppc32.ibat[i] = vcpu3s->ibat[i].raw;
 922                         sregs->u.s.ppc32.dbat[i] = vcpu3s->dbat[i].raw;
 923                 }
 924         }
 925
 926         return 0;
 927 }
 928
 929 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 930                                   struct kvm_sregs *sregs)
 931 {
 932         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
 933         int i;
 934
 935         kvmppc_set_pvr(vcpu, sregs->pvr);
 936
 937         vcpu3s->sdr1 = sregs->u.s.sdr1;
 938         if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) {
 939                 for (i = 0; i < 64; i++) {
 940                         vcpu->arch.mmu.slbmte(vcpu, sregs->u.s.ppc64.slb[i].slbv,
 941                                                     sregs->u.s.ppc64.slb[i].slbe);
 942                 }
 943         } else {
 944                 for (i = 0; i < 16; i++) {
 945                         vcpu->arch.mmu.mtsrin(vcpu, i, sregs->u.s.ppc32.sr[i]);
 946                 }
 947                 for (i = 0; i < 8; i++) {
 948                         kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), false,
 949                                        (u32)sregs->u.s.ppc32.ibat[i]);
 950                         kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), true,
 951                                        (u32)(sregs->u.s.ppc32.ibat[i] >> 32));
 952                         kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), false,
 953                                        (u32)sregs->u.s.ppc32.dbat[i]);
 954                         kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), true,
 955                                        (u32)(sregs->u.s.ppc32.dbat[i] >> 32));
 956                 }
 957         }
 958
 959         /* Flush the MMU after messing with the segments */
 960         kvmppc_mmu_pte_flush(vcpu, 0, 0);
 961
 962         return 0;
 963 }
 964
 965 int kvmppc_get_one_reg(struct kvm_vcpu *vcpu, u64 id, union kvmppc_one_reg *val)
 966 {
 967         int r = 0;
 968
 969         switch (id) {
 970         case KVM_REG_PPC_HIOR:
 971                 *val = get_reg_val(id, to_book3s(vcpu)->hior);
 972                 break;
 973 #ifdef CONFIG_VSX
 974         case KVM_REG_PPC_VSR0 ... KVM_REG_PPC_VSR31: {
 975                 long int i = id - KVM_REG_PPC_VSR0;
 976
 977                 if (!cpu_has_feature(CPU_FTR_VSX)) {
 978                         r = -ENXIO;
 979                         break;
 980                 }
 981                 val->vsxval[0] = vcpu->arch.fpr[i];
 982                 val->vsxval[1] = vcpu->arch.vsr[i];
 983                 break;
 984         }
 985 #endif /* CONFIG_VSX */
 986         default:
 987                 r = -EINVAL;
 988                 break;
 989         }
 990
 991         return r;
 992 }
 993
 994 int kvmppc_set_one_reg(struct kvm_vcpu *vcpu, u64 id, union kvmppc_one_reg *val)
 995 {
 996         int r = 0;
 997
 998         switch (id) {
 999         case KVM_REG_PPC_HIOR:
1000                 to_book3s(vcpu)->hior = set_reg_val(id, *val);
1001                 to_book3s(vcpu)->hior_explicit = true;
1002                 break;
1003 #ifdef CONFIG_VSX
1004         case KVM_REG_PPC_VSR0 ... KVM_REG_PPC_VSR31: {
1005                 long int i = id - KVM_REG_PPC_VSR0;
1006
1007                 if (!cpu_has_feature(CPU_FTR_VSX)) {
1008                         r = -ENXIO;
1009                         break;
1010                 }
1011                 vcpu->arch.fpr[i] = val->vsxval[0];
1012                 vcpu->arch.vsr[i] = val->vsxval[1];
1013                 break;
1014         }
1015 #endif /* CONFIG_VSX */
1016         default:
1017                 r = -EINVAL;
1018                 break;
1019         }
1020
1021         return r;
1022 }
1023
1024 int kvmppc_core_check_processor_compat(void)
1025 {
1026         return 0;
1027 }
1028
1029 struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
1030 {
1031         struct kvmppc_vcpu_book3s *vcpu_book3s;
1032         struct kvm_vcpu *vcpu;
1033         int err = -ENOMEM;
1034         unsigned long p;
1035
1036         vcpu_book3s = vzalloc(sizeof(struct kvmppc_vcpu_book3s));
1037         if (!vcpu_book3s)
1038                 goto out;
1039
1040         vcpu_book3s->shadow_vcpu = (struct kvmppc_book3s_shadow_vcpu *)
1041                 kzalloc(sizeof(*vcpu_book3s->shadow_vcpu), GFP_KERNEL);
1042         if (!vcpu_book3s->shadow_vcpu)
1043                 goto free_vcpu;
1044
1045         vcpu = &vcpu_book3s->vcpu;
1046         err = kvm_vcpu_init(vcpu, kvm, id);
1047         if (err)
1048                 goto free_shadow_vcpu;
1049
1050         p = __get_free_page(GFP_KERNEL|__GFP_ZERO);
1051         /* the real shared page fills the last 4k of our page */
1052         vcpu->arch.shared = (void*)(p + PAGE_SIZE - 4096);
1053         if (!p)
1054                 goto uninit_vcpu;
1055
1056 #ifdef CONFIG_PPC_BOOK3S_64
1057         /* default to book3s_64 (970fx) */
1058         vcpu->arch.pvr = 0x3C0301;
1059 #else
1060         /* default to book3s_32 (750) */
1061         vcpu->arch.pvr = 0x84202;
1062 #endif
1063         kvmppc_set_pvr(vcpu, vcpu->arch.pvr);
1064         vcpu->arch.slb_nr = 64;
1065
1066         vcpu->arch.shadow_msr = MSR_USER64;
1067
1068         err = kvmppc_mmu_init(vcpu);
1069         if (err < 0)
1070                 goto uninit_vcpu;
1071
1072         return vcpu;
1073
1074 uninit_vcpu:
1075         kvm_vcpu_uninit(vcpu);
1076 free_shadow_vcpu:
1077         kfree(vcpu_book3s->shadow_vcpu);
1078 free_vcpu:
1079         vfree(vcpu_book3s);
1080 out:
1081         return ERR_PTR(err);
1082 }
1083
1084 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
1085 {
1086         struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
1087
1088         free_page((unsigned long)vcpu->arch.shared & PAGE_MASK);
1089         kvm_vcpu_uninit(vcpu);
1090         kfree(vcpu_book3s->shadow_vcpu);
1091         vfree(vcpu_book3s);
1092 }
1093
1094 int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
1095 {
1096         int ret;
1097         double fpr[32][TS_FPRWIDTH];
1098         unsigned int fpscr;
1099         int fpexc_mode;
1100 #ifdef CONFIG_ALTIVEC
1101         vector128 vr[32];
1102         vector128 vscr;
1103         unsigned long uninitialized_var(vrsave);
1104         int used_vr;
1105 #endif
1106 #ifdef CONFIG_VSX
1107         int used_vsr;
1108 #endif
1109         ulong ext_msr;
1110
1111         /* Check if we can run the vcpu at all */
1112         if (!vcpu->arch.sane) {
1113                 kvm_run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1114                 ret = -EINVAL;
1115                 goto out;
1116         }
1117
1118         /*
1119          * Interrupts could be timers for the guest which we have to inject
1120          * again, so let's postpone them until we're in the guest and if we
1121          * really did time things so badly, then we just exit again due to
1122          * a host external interrupt.
1123          */
1124         local_irq_disable();
1125         ret = kvmppc_prepare_to_enter(vcpu);
1126         if (ret <= 0) {
1127                 local_irq_enable();
1128                 goto out;
1129         }
1130
1131         /* Save FPU state in stack */
1132         if (current->thread.regs->msr & MSR_FP)
1133                 giveup_fpu(current);
1134         memcpy(fpr, current->thread.fpr, sizeof(current->thread.fpr));
1135         fpscr = current->thread.fpscr.val;
1136         fpexc_mode = current->thread.fpexc_mode;
1137
1138 #ifdef CONFIG_ALTIVEC
1139         /* Save Altivec state in stack */
1140         used_vr = current->thread.used_vr;
1141         if (used_vr) {
1142                 if (current->thread.regs->msr & MSR_VEC)
1143                         giveup_altivec(current);
1144                 memcpy(vr, current->thread.vr, sizeof(current->thread.vr));
1145                 vscr = current->thread.vscr;
1146                 vrsave = current->thread.vrsave;
1147         }
1148 #endif
1149
1150 #ifdef CONFIG_VSX
1151         /* Save VSX state in stack */
1152         used_vsr = current->thread.used_vsr;
1153         if (used_vsr && (current->thread.regs->msr & MSR_VSX))
1154                 __giveup_vsx(current);
1155 #endif
1156
1157         /* Remember the MSR with disabled extensions */
1158         ext_msr = current->thread.regs->msr;
1159
1160         /* Preload FPU if it's enabled */
1161         if (vcpu->arch.shared->msr & MSR_FP)
1162                 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
1163
1164         kvmppc_lazy_ee_enable();
1165
1166         ret = __kvmppc_vcpu_run(kvm_run, vcpu);
1167
1168         /* No need for kvm_guest_exit. It's done in handle_exit.
1169            We also get here with interrupts enabled. */
1170
1171         /* Make sure we save the guest FPU/Altivec/VSX state */
1172         kvmppc_giveup_ext(vcpu, MSR_FP | MSR_VEC | MSR_VSX);
1173
1174         current->thread.regs->msr = ext_msr;
1175
1176         /* Restore FPU/VSX state from stack */
1177         memcpy(current->thread.fpr, fpr, sizeof(current->thread.fpr));
1178         current->thread.fpscr.val = fpscr;
1179         current->thread.fpexc_mode = fpexc_mode;
1180
1181 #ifdef CONFIG_ALTIVEC
1182         /* Restore Altivec state from stack */
1183         if (used_vr && current->thread.used_vr) {
1184                 memcpy(current->thread.vr, vr, sizeof(current->thread.vr));
1185                 current->thread.vscr = vscr;
1186                 current->thread.vrsave = vrsave;
1187         }
1188         current->thread.used_vr = used_vr;
1189 #endif
1190
1191 #ifdef CONFIG_VSX
1192         current->thread.used_vsr = used_vsr;
1193 #endif
1194
1195 out:
1196         vcpu->mode = OUTSIDE_GUEST_MODE;
1197         return ret;
1198 }
1199
1200 /*
1201  * Get (and clear) the dirty memory log for a memory slot.
1202  */
1203 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
1204                                       struct kvm_dirty_log *log)
1205 {
1206         struct kvm_memory_slot *memslot;
1207         struct kvm_vcpu *vcpu;
1208         ulong ga, ga_end;
1209         int is_dirty = 0;
1210         int r;
1211         unsigned long n;
1212
1213         mutex_lock(&kvm->slots_lock);
1214
1215         r = kvm_get_dirty_log(kvm, log, &is_dirty);
1216         if (r)
1217                 goto out;
1218
1219         /* If nothing is dirty, don't bother messing with page tables. */
1220         if (is_dirty) {
1221                 memslot = id_to_memslot(kvm->memslots, log->slot);
1222
1223                 ga = memslot->base_gfn << PAGE_SHIFT;
1224                 ga_end = ga + (memslot->npages << PAGE_SHIFT);
1225
1226                 kvm_for_each_vcpu(n, vcpu, kvm)
1227                         kvmppc_mmu_pte_pflush(vcpu, ga, ga_end);
1228
1229                 n = kvm_dirty_bitmap_bytes(memslot);
1230                 memset(memslot->dirty_bitmap, 0, n);
1231         }
1232
1233         r = 0;
1234 out:
1235         mutex_unlock(&kvm->slots_lock);
1236         return r;
1237 }
1238
1239 #ifdef CONFIG_PPC64
1240 int kvm_vm_ioctl_get_smmu_info(struct kvm *kvm, struct kvm_ppc_smmu_info *info)
1241 {
1242         /* No flags */
1243         info->flags = 0;
1244
1245         /* SLB is always 64 entries */
1246         info->slb_size = 64;
1247
1248         /* Standard 4k base page size segment */
1249         info->sps[0].page_shift = 12;
1250         info->sps[0].slb_enc = 0;
1251         info->sps[0].enc[0].page_shift = 12;
1252         info->sps[0].enc[0].pte_enc = 0;
1253
1254         /* Standard 16M large page size segment */
1255         info->sps[1].page_shift = 24;
1256         info->sps[1].slb_enc = SLB_VSID_L;
1257         info->sps[1].enc[0].page_shift = 24;
1258         info->sps[1].enc[0].pte_enc = 0;
1259
1260         return 0;
1261 }
1262 #endif /* CONFIG_PPC64 */
1263
1264 void kvmppc_core_free_memslot(struct kvm_memory_slot *free,
1265                               struct kvm_memory_slot *dont)
1266 {
1267 }
1268
1269 int kvmppc_core_create_memslot(struct kvm_memory_slot *slot,
1270                                unsigned long npages)
1271 {
1272         return 0;
1273 }
1274
1275 int kvmppc_core_prepare_memory_region(struct kvm *kvm,
1276                                       struct kvm_memory_slot *memslot,
1277                                       struct kvm_userspace_memory_region *mem)
1278 {
1279         return 0;
1280 }
1281
1282 void kvmppc_core_commit_memory_region(struct kvm *kvm,
1283                                 struct kvm_userspace_memory_region *mem,
1284                                 const struct kvm_memory_slot *old)
1285 {
1286 }
1287
1288 void kvmppc_core_flush_memslot(struct kvm *kvm, struct kvm_memory_slot *memslot)
1289 {
1290 }
1291
1292 static unsigned int kvm_global_user_count = 0;
1293 static DEFINE_SPINLOCK(kvm_global_user_count_lock);
1294
1295 int kvmppc_core_init_vm(struct kvm *kvm)
1296 {
1297 #ifdef CONFIG_PPC64
1298         INIT_LIST_HEAD(&kvm->arch.spapr_tce_tables);
1299         INIT_LIST_HEAD(&kvm->arch.rtas_tokens);
1300 #endif
1301
1302         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
1303                 spin_lock(&kvm_global_user_count_lock);
1304                 if (++kvm_global_user_count == 1)
1305                         pSeries_disable_reloc_on_exc();
1306                 spin_unlock(&kvm_global_user_count_lock);
1307         }
1308         return 0;
1309 }
1310
1311 void kvmppc_core_destroy_vm(struct kvm *kvm)
1312 {
1313 #ifdef CONFIG_PPC64
1314         WARN_ON(!list_empty(&kvm->arch.spapr_tce_tables));
1315 #endif
1316
1317         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
1318                 spin_lock(&kvm_global_user_count_lock);
1319                 BUG_ON(kvm_global_user_count == 0);
1320                 if (--kvm_global_user_count == 0)
1321                         pSeries_enable_reloc_on_exc();
1322                 spin_unlock(&kvm_global_user_count_lock);
1323         }
1324 }
1325
1326 static int kvmppc_book3s_init(void)
1327 {
1328         int r;
1329
1330         r = kvm_init(NULL, sizeof(struct kvmppc_vcpu_book3s), 0,
1331                      THIS_MODULE);
1332
1333         if (r)
1334                 return r;
1335
1336         r = kvmppc_mmu_hpte_sysinit();
1337
1338         return r;
1339 }
1340
1341 static void kvmppc_book3s_exit(void)
1342 {
1343         kvmppc_mmu_hpte_sysexit();
1344         kvm_exit();
1345 }
1346
1347 module_init(kvmppc_book3s_init);
1348 module_exit(kvmppc_book3s_exit);