Pileus Git - ~andy/linux/blob - 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 #include <linux/module.h>
  44
  45 #include "book3s.h"
  46
  47 #define CREATE_TRACE_POINTS
  48 #include "trace_pr.h"
  49
  50 /* #define EXIT_DEBUG */
  51 /* #define DEBUG_EXT */
  52
  53 static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
  54                              ulong msr);
  55
  56 /* Some compatibility defines */
  57 #ifdef CONFIG_PPC_BOOK3S_32
  58 #define MSR_USER32 MSR_USER
  59 #define MSR_USER64 MSR_USER
  60 #define HW_PAGE_SIZE PAGE_SIZE
  61 #endif
  62
  63 static void kvmppc_core_vcpu_load_pr(struct kvm_vcpu *vcpu, int cpu)
  64 {
  65 #ifdef CONFIG_PPC_BOOK3S_64
  66         struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
  67         memcpy(svcpu->slb, to_book3s(vcpu)->slb_shadow, sizeof(svcpu->slb));
  68         svcpu->slb_max = to_book3s(vcpu)->slb_shadow_max;
  69         svcpu_put(svcpu);
  70 #endif
  71         vcpu->cpu = smp_processor_id();
  72 #ifdef CONFIG_PPC_BOOK3S_32
  73         current->thread.kvm_shadow_vcpu = vcpu->arch.shadow_vcpu;
  74 #endif
  75 }
  76
  77 static void kvmppc_core_vcpu_put_pr(struct kvm_vcpu *vcpu)
  78 {
  79 #ifdef CONFIG_PPC_BOOK3S_64
  80         struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
  81         memcpy(to_book3s(vcpu)->slb_shadow, svcpu->slb, sizeof(svcpu->slb));
  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 /* Copy data needed by real-mode code from vcpu to shadow vcpu */
  91 void kvmppc_copy_to_svcpu(struct kvmppc_book3s_shadow_vcpu *svcpu,
  92                           struct kvm_vcpu *vcpu)
  93 {
  94         svcpu->gpr[0] = vcpu->arch.gpr[0];
  95         svcpu->gpr[1] = vcpu->arch.gpr[1];
  96         svcpu->gpr[2] = vcpu->arch.gpr[2];
  97         svcpu->gpr[3] = vcpu->arch.gpr[3];
  98         svcpu->gpr[4] = vcpu->arch.gpr[4];
  99         svcpu->gpr[5] = vcpu->arch.gpr[5];
 100         svcpu->gpr[6] = vcpu->arch.gpr[6];
 101         svcpu->gpr[7] = vcpu->arch.gpr[7];
 102         svcpu->gpr[8] = vcpu->arch.gpr[8];
 103         svcpu->gpr[9] = vcpu->arch.gpr[9];
 104         svcpu->gpr[10] = vcpu->arch.gpr[10];
 105         svcpu->gpr[11] = vcpu->arch.gpr[11];
 106         svcpu->gpr[12] = vcpu->arch.gpr[12];
 107         svcpu->gpr[13] = vcpu->arch.gpr[13];
 108         svcpu->cr  = vcpu->arch.cr;
 109         svcpu->xer = vcpu->arch.xer;
 110         svcpu->ctr = vcpu->arch.ctr;
 111         svcpu->lr  = vcpu->arch.lr;
 112         svcpu->pc  = vcpu->arch.pc;
 113 }
 114
 115 /* Copy data touched by real-mode code from shadow vcpu back to vcpu */
 116 void kvmppc_copy_from_svcpu(struct kvm_vcpu *vcpu,
 117                             struct kvmppc_book3s_shadow_vcpu *svcpu)
 118 {
 119         vcpu->arch.gpr[0] = svcpu->gpr[0];
 120         vcpu->arch.gpr[1] = svcpu->gpr[1];
 121         vcpu->arch.gpr[2] = svcpu->gpr[2];
 122         vcpu->arch.gpr[3] = svcpu->gpr[3];
 123         vcpu->arch.gpr[4] = svcpu->gpr[4];
 124         vcpu->arch.gpr[5] = svcpu->gpr[5];
 125         vcpu->arch.gpr[6] = svcpu->gpr[6];
 126         vcpu->arch.gpr[7] = svcpu->gpr[7];
 127         vcpu->arch.gpr[8] = svcpu->gpr[8];
 128         vcpu->arch.gpr[9] = svcpu->gpr[9];
 129         vcpu->arch.gpr[10] = svcpu->gpr[10];
 130         vcpu->arch.gpr[11] = svcpu->gpr[11];
 131         vcpu->arch.gpr[12] = svcpu->gpr[12];
 132         vcpu->arch.gpr[13] = svcpu->gpr[13];
 133         vcpu->arch.cr  = svcpu->cr;
 134         vcpu->arch.xer = svcpu->xer;
 135         vcpu->arch.ctr = svcpu->ctr;
 136         vcpu->arch.lr  = svcpu->lr;
 137         vcpu->arch.pc  = svcpu->pc;
 138         vcpu->arch.shadow_srr1 = svcpu->shadow_srr1;
 139         vcpu->arch.fault_dar   = svcpu->fault_dar;
 140         vcpu->arch.fault_dsisr = svcpu->fault_dsisr;
 141         vcpu->arch.last_inst   = svcpu->last_inst;
 142 }
 143
 144 static int kvmppc_core_check_requests_pr(struct kvm_vcpu *vcpu)
 145 {
 146         int r = 1; /* Indicate we want to get back into the guest */
 147
 148         /* We misuse TLB_FLUSH to indicate that we want to clear
 149            all shadow cache entries */
 150         if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu))
 151                 kvmppc_mmu_pte_flush(vcpu, 0, 0);
 152
 153         return r;
 154 }
 155
 156 /************* MMU Notifiers *************/
 157 static void do_kvm_unmap_hva(struct kvm *kvm, unsigned long start,
 158                              unsigned long end)
 159 {
 160         long i;
 161         struct kvm_vcpu *vcpu;
 162         struct kvm_memslots *slots;
 163         struct kvm_memory_slot *memslot;
 164
 165         slots = kvm_memslots(kvm);
 166         kvm_for_each_memslot(memslot, slots) {
 167                 unsigned long hva_start, hva_end;
 168                 gfn_t gfn, gfn_end;
 169
 170                 hva_start = max(start, memslot->userspace_addr);
 171                 hva_end = min(end, memslot->userspace_addr +
 172                                         (memslot->npages << PAGE_SHIFT));
 173                 if (hva_start >= hva_end)
 174                         continue;
 175                 /*
 176                  * {gfn(page) | page intersects with [hva_start, hva_end)} =
 177                  * {gfn, gfn+1, ..., gfn_end-1}.
 178                  */
 179                 gfn = hva_to_gfn_memslot(hva_start, memslot);
 180                 gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot);
 181                 kvm_for_each_vcpu(i, vcpu, kvm)
 182                         kvmppc_mmu_pte_pflush(vcpu, gfn << PAGE_SHIFT,
 183                                               gfn_end << PAGE_SHIFT);
 184         }
 185 }
 186
 187 static int kvm_unmap_hva_pr(struct kvm *kvm, unsigned long hva)
 188 {
 189         trace_kvm_unmap_hva(hva);
 190
 191         do_kvm_unmap_hva(kvm, hva, hva + PAGE_SIZE);
 192
 193         return 0;
 194 }
 195
 196 static int kvm_unmap_hva_range_pr(struct kvm *kvm, unsigned long start,
 197                                   unsigned long end)
 198 {
 199         do_kvm_unmap_hva(kvm, start, end);
 200
 201         return 0;
 202 }
 203
 204 static int kvm_age_hva_pr(struct kvm *kvm, unsigned long hva)
 205 {
 206         /* XXX could be more clever ;) */
 207         return 0;
 208 }
 209
 210 static int kvm_test_age_hva_pr(struct kvm *kvm, unsigned long hva)
 211 {
 212         /* XXX could be more clever ;) */
 213         return 0;
 214 }
 215
 216 static void kvm_set_spte_hva_pr(struct kvm *kvm, unsigned long hva, pte_t pte)
 217 {
 218         /* The page will get remapped properly on its next fault */
 219         do_kvm_unmap_hva(kvm, hva, hva + PAGE_SIZE);
 220 }
 221
 222 /*****************************************/
 223
 224 static void kvmppc_recalc_shadow_msr(struct kvm_vcpu *vcpu)
 225 {
 226         ulong smsr = vcpu->arch.shared->msr;
 227
 228         /* Guest MSR values */
 229         smsr &= MSR_FE0 | MSR_FE1 | MSR_SF | MSR_SE | MSR_BE;
 230         /* Process MSR values */
 231         smsr |= MSR_ME | MSR_RI | MSR_IR | MSR_DR | MSR_PR | MSR_EE;
 232         /* External providers the guest reserved */
 233         smsr |= (vcpu->arch.shared->msr & vcpu->arch.guest_owned_ext);
 234         /* 64-bit Process MSR values */
 235 #ifdef CONFIG_PPC_BOOK3S_64
 236         smsr |= MSR_ISF | MSR_HV;
 237 #endif
 238         vcpu->arch.shadow_msr = smsr;
 239 }
 240
 241 static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)
 242 {
 243         ulong old_msr = vcpu->arch.shared->msr;
 244
 245 #ifdef EXIT_DEBUG
 246         printk(KERN_INFO "KVM: Set MSR to 0x%llx\n", msr);
 247 #endif
 248
 249         msr &= to_book3s(vcpu)->msr_mask;
 250         vcpu->arch.shared->msr = msr;
 251         kvmppc_recalc_shadow_msr(vcpu);
 252
 253         if (msr & MSR_POW) {
 254                 if (!vcpu->arch.pending_exceptions) {
 255                         kvm_vcpu_block(vcpu);
 256                         clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
 257                         vcpu->stat.halt_wakeup++;
 258
 259                         /* Unset POW bit after we woke up */
 260                         msr &= ~MSR_POW;
 261                         vcpu->arch.shared->msr = msr;
 262                 }
 263         }
 264
 265         if ((vcpu->arch.shared->msr & (MSR_PR|MSR_IR|MSR_DR)) !=
 266                    (old_msr & (MSR_PR|MSR_IR|MSR_DR))) {
 267                 kvmppc_mmu_flush_segments(vcpu);
 268                 kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
 269
 270                 /* Preload magic page segment when in kernel mode */
 271                 if (!(msr & MSR_PR) && vcpu->arch.magic_page_pa) {
 272                         struct kvm_vcpu_arch *a = &vcpu->arch;
 273
 274                         if (msr & MSR_DR)
 275                                 kvmppc_mmu_map_segment(vcpu, a->magic_page_ea);
 276                         else
 277                                 kvmppc_mmu_map_segment(vcpu, a->magic_page_pa);
 278                 }
 279         }
 280
 281         /*
 282          * When switching from 32 to 64-bit, we may have a stale 32-bit
 283          * magic page around, we need to flush it. Typically 32-bit magic
 284          * page will be instanciated when calling into RTAS. Note: We
 285          * assume that such transition only happens while in kernel mode,
 286          * ie, we never transition from user 32-bit to kernel 64-bit with
 287          * a 32-bit magic page around.
 288          */
 289         if (vcpu->arch.magic_page_pa &&
 290             !(old_msr & MSR_PR) && !(old_msr & MSR_SF) && (msr & MSR_SF)) {
 291                 /* going from RTAS to normal kernel code */
 292                 kvmppc_mmu_pte_flush(vcpu, (uint32_t)vcpu->arch.magic_page_pa,
 293                                      ~0xFFFUL);
 294         }
 295
 296         /* Preload FPU if it's enabled */
 297         if (vcpu->arch.shared->msr & MSR_FP)
 298                 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
 299 }
 300
 301 void kvmppc_set_pvr_pr(struct kvm_vcpu *vcpu, u32 pvr)
 302 {
 303         u32 host_pvr;
 304
 305         vcpu->arch.hflags &= ~BOOK3S_HFLAG_SLB;
 306         vcpu->arch.pvr = pvr;
 307 #ifdef CONFIG_PPC_BOOK3S_64
 308         if ((pvr >= 0x330000) && (pvr < 0x70330000)) {
 309                 kvmppc_mmu_book3s_64_init(vcpu);
 310                 if (!to_book3s(vcpu)->hior_explicit)
 311                         to_book3s(vcpu)->hior = 0xfff00000;
 312                 to_book3s(vcpu)->msr_mask = 0xffffffffffffffffULL;
 313                 vcpu->arch.cpu_type = KVM_CPU_3S_64;
 314         } else
 315 #endif
 316         {
 317                 kvmppc_mmu_book3s_32_init(vcpu);
 318                 if (!to_book3s(vcpu)->hior_explicit)
 319                         to_book3s(vcpu)->hior = 0;
 320                 to_book3s(vcpu)->msr_mask = 0xffffffffULL;
 321                 vcpu->arch.cpu_type = KVM_CPU_3S_32;
 322         }
 323
 324         kvmppc_sanity_check(vcpu);
 325
 326         /* If we are in hypervisor level on 970, we can tell the CPU to
 327          * treat DCBZ as 32 bytes store */
 328         vcpu->arch.hflags &= ~BOOK3S_HFLAG_DCBZ32;
 329         if (vcpu->arch.mmu.is_dcbz32(vcpu) && (mfmsr() & MSR_HV) &&
 330             !strcmp(cur_cpu_spec->platform, "ppc970"))
 331                 vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
 332
 333         /* Cell performs badly if MSR_FEx are set. So let's hope nobody
 334            really needs them in a VM on Cell and force disable them. */
 335         if (!strcmp(cur_cpu_spec->platform, "ppc-cell-be"))
 336                 to_book3s(vcpu)->msr_mask &= ~(MSR_FE0 | MSR_FE1);
 337
 338         /*
 339          * If they're asking for POWER6 or later, set the flag
 340          * indicating that we can do multiple large page sizes
 341          * and 1TB segments.
 342          * Also set the flag that indicates that tlbie has the large
 343          * page bit in the RB operand instead of the instruction.
 344          */
 345         switch (PVR_VER(pvr)) {
 346         case PVR_POWER6:
 347         case PVR_POWER7:
 348         case PVR_POWER7p:
 349         case PVR_POWER8:
 350                 vcpu->arch.hflags |= BOOK3S_HFLAG_MULTI_PGSIZE |
 351                         BOOK3S_HFLAG_NEW_TLBIE;
 352                 break;
 353         }
 354
 355 #ifdef CONFIG_PPC_BOOK3S_32
 356         /* 32 bit Book3S always has 32 byte dcbz */
 357         vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
 358 #endif
 359
 360         /* On some CPUs we can execute paired single operations natively */
 361         asm ( "mfpvr %0" : "=r"(host_pvr));
 362         switch (host_pvr) {
 363         case 0x00080200:        /* lonestar 2.0 */
 364         case 0x00088202:        /* lonestar 2.2 */
 365         case 0x70000100:        /* gekko 1.0 */
 366         case 0x00080100:        /* gekko 2.0 */
 367         case 0x00083203:        /* gekko 2.3a */
 368         case 0x00083213:        /* gekko 2.3b */
 369         case 0x00083204:        /* gekko 2.4 */
 370         case 0x00083214:        /* gekko 2.4e (8SE) - retail HW2 */
 371         case 0x00087200:        /* broadway */
 372                 vcpu->arch.hflags |= BOOK3S_HFLAG_NATIVE_PS;
 373                 /* Enable HID2.PSE - in case we need it later */
 374                 mtspr(SPRN_HID2_GEKKO, mfspr(SPRN_HID2_GEKKO) | (1 << 29));
 375         }
 376 }
 377
 378 /* Book3s_32 CPUs always have 32 bytes cache line size, which Linux assumes. To
 379  * make Book3s_32 Linux work on Book3s_64, we have to make sure we trap dcbz to
 380  * emulate 32 bytes dcbz length.
 381  *
 382  * The Book3s_64 inventors also realized this case and implemented a special bit
 383  * in the HID5 register, which is a hypervisor ressource. Thus we can't use it.
 384  *
 385  * My approach here is to patch the dcbz instruction on executing pages.
 386  */
 387 static void kvmppc_patch_dcbz(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
 388 {
 389         struct page *hpage;
 390         u64 hpage_offset;
 391         u32 *page;
 392         int i;
 393
 394         hpage = gfn_to_page(vcpu->kvm, pte->raddr >> PAGE_SHIFT);
 395         if (is_error_page(hpage))
 396                 return;
 397
 398         hpage_offset = pte->raddr & ~PAGE_MASK;
 399         hpage_offset &= ~0xFFFULL;
 400         hpage_offset /= 4;
 401
 402         get_page(hpage);
 403         page = kmap_atomic(hpage);
 404
 405         /* patch dcbz into reserved instruction, so we trap */
 406         for (i=hpage_offset; i < hpage_offset + (HW_PAGE_SIZE / 4); i++)
 407                 if ((page[i] & 0xff0007ff) == INS_DCBZ)
 408                         page[i] &= 0xfffffff7;
 409
 410         kunmap_atomic(page);
 411         put_page(hpage);
 412 }
 413
 414 static int kvmppc_visible_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
 415 {
 416         ulong mp_pa = vcpu->arch.magic_page_pa;
 417
 418         if (!(vcpu->arch.shared->msr & MSR_SF))
 419                 mp_pa = (uint32_t)mp_pa;
 420
 421         if (unlikely(mp_pa) &&
 422             unlikely((mp_pa & KVM_PAM) >> PAGE_SHIFT == gfn)) {
 423                 return 1;
 424         }
 425
 426         return kvm_is_visible_gfn(vcpu->kvm, gfn);
 427 }
 428
 429 int kvmppc_handle_pagefault(struct kvm_run *run, struct kvm_vcpu *vcpu,
 430                             ulong eaddr, int vec)
 431 {
 432         bool data = (vec == BOOK3S_INTERRUPT_DATA_STORAGE);
 433         bool iswrite = false;
 434         int r = RESUME_GUEST;
 435         int relocated;
 436         int page_found = 0;
 437         struct kvmppc_pte pte;
 438         bool is_mmio = false;
 439         bool dr = (vcpu->arch.shared->msr & MSR_DR) ? true : false;
 440         bool ir = (vcpu->arch.shared->msr & MSR_IR) ? true : false;
 441         u64 vsid;
 442
 443         relocated = data ? dr : ir;
 444         if (data && (vcpu->arch.fault_dsisr & DSISR_ISSTORE))
 445                 iswrite = true;
 446
 447         /* Resolve real address if translation turned on */
 448         if (relocated) {
 449                 page_found = vcpu->arch.mmu.xlate(vcpu, eaddr, &pte, data, iswrite);
 450         } else {
 451                 pte.may_execute = true;
 452                 pte.may_read = true;
 453                 pte.may_write = true;
 454                 pte.raddr = eaddr & KVM_PAM;
 455                 pte.eaddr = eaddr;
 456                 pte.vpage = eaddr >> 12;
 457                 pte.page_size = MMU_PAGE_64K;
 458         }
 459
 460         switch (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) {
 461         case 0:
 462                 pte.vpage |= ((u64)VSID_REAL << (SID_SHIFT - 12));
 463                 break;
 464         case MSR_DR:
 465         case MSR_IR:
 466                 vcpu->arch.mmu.esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid);
 467
 468                 if ((vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) == MSR_DR)
 469                         pte.vpage |= ((u64)VSID_REAL_DR << (SID_SHIFT - 12));
 470                 else
 471                         pte.vpage |= ((u64)VSID_REAL_IR << (SID_SHIFT - 12));
 472                 pte.vpage |= vsid;
 473
 474                 if (vsid == -1)
 475                         page_found = -EINVAL;
 476                 break;
 477         }
 478
 479         if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
 480            (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
 481                 /*
 482                  * If we do the dcbz hack, we have to NX on every execution,
 483                  * so we can patch the executing code. This renders our guest
 484                  * NX-less.
 485                  */
 486                 pte.may_execute = !data;
 487         }
 488
 489         if (page_found == -ENOENT) {
 490                 /* Page not found in guest PTE entries */
 491                 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
 492                 vcpu->arch.shared->dsisr = vcpu->arch.fault_dsisr;
 493                 vcpu->arch.shared->msr |=
 494                         vcpu->arch.shadow_srr1 & 0x00000000f8000000ULL;
 495                 kvmppc_book3s_queue_irqprio(vcpu, vec);
 496         } else if (page_found == -EPERM) {
 497                 /* Storage protection */
 498                 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
 499                 vcpu->arch.shared->dsisr = vcpu->arch.fault_dsisr & ~DSISR_NOHPTE;
 500                 vcpu->arch.shared->dsisr |= DSISR_PROTFAULT;
 501                 vcpu->arch.shared->msr |=
 502                         vcpu->arch.shadow_srr1 & 0x00000000f8000000ULL;
 503                 kvmppc_book3s_queue_irqprio(vcpu, vec);
 504         } else if (page_found == -EINVAL) {
 505                 /* Page not found in guest SLB */
 506                 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
 507                 kvmppc_book3s_queue_irqprio(vcpu, vec + 0x80);
 508         } else if (!is_mmio &&
 509                    kvmppc_visible_gfn(vcpu, pte.raddr >> PAGE_SHIFT)) {
 510                 if (data && !(vcpu->arch.fault_dsisr & DSISR_NOHPTE)) {
 511                         /*
 512                          * There is already a host HPTE there, presumably
 513                          * a read-only one for a page the guest thinks
 514                          * is writable, so get rid of it first.
 515                          */
 516                         kvmppc_mmu_unmap_page(vcpu, &pte);
 517                 }
 518                 /* The guest's PTE is not mapped yet. Map on the host */
 519                 kvmppc_mmu_map_page(vcpu, &pte, iswrite);
 520                 if (data)
 521                         vcpu->stat.sp_storage++;
 522                 else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
 523                          (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32)))
 524                         kvmppc_patch_dcbz(vcpu, &pte);
 525         } else {
 526                 /* MMIO */
 527                 vcpu->stat.mmio_exits++;
 528                 vcpu->arch.paddr_accessed = pte.raddr;
 529                 vcpu->arch.vaddr_accessed = pte.eaddr;
 530                 r = kvmppc_emulate_mmio(run, vcpu);
 531                 if ( r == RESUME_HOST_NV )
 532                         r = RESUME_HOST;
 533         }
 534
 535         return r;
 536 }
 537
 538 static inline int get_fpr_index(int i)
 539 {
 540         return i * TS_FPRWIDTH;
 541 }
 542
 543 /* Give up external provider (FPU, Altivec, VSX) */
 544 void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr)
 545 {
 546         struct thread_struct *t = &current->thread;
 547         u64 *vcpu_fpr = vcpu->arch.fpr;
 548 #ifdef CONFIG_VSX
 549         u64 *vcpu_vsx = vcpu->arch.vsr;
 550 #endif
 551         u64 *thread_fpr = &t->fp_state.fpr[0][0];
 552         int i;
 553
 554         /*
 555          * VSX instructions can access FP and vector registers, so if
 556          * we are giving up VSX, make sure we give up FP and VMX as well.
 557          */
 558         if (msr & MSR_VSX)
 559                 msr |= MSR_FP | MSR_VEC;
 560
 561         msr &= vcpu->arch.guest_owned_ext;
 562         if (!msr)
 563                 return;
 564
 565 #ifdef DEBUG_EXT
 566         printk(KERN_INFO "Giving up ext 0x%lx\n", msr);
 567 #endif
 568
 569         if (msr & MSR_FP) {
 570                 /*
 571                  * Note that on CPUs with VSX, giveup_fpu stores
 572                  * both the traditional FP registers and the added VSX
 573                  * registers into thread.fp_state.fpr[].
 574                  */
 575                 if (current->thread.regs->msr & MSR_FP)
 576                         giveup_fpu(current);
 577                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++)
 578                         vcpu_fpr[i] = thread_fpr[get_fpr_index(i)];
 579
 580                 vcpu->arch.fpscr = t->fp_state.fpscr;
 581
 582 #ifdef CONFIG_VSX
 583                 if (cpu_has_feature(CPU_FTR_VSX))
 584                         for (i = 0; i < ARRAY_SIZE(vcpu->arch.vsr) / 2; i++)
 585                                 vcpu_vsx[i] = thread_fpr[get_fpr_index(i) + 1];
 586 #endif
 587         }
 588
 589 #ifdef CONFIG_ALTIVEC
 590         if (msr & MSR_VEC) {
 591                 if (current->thread.regs->msr & MSR_VEC)
 592                         giveup_altivec(current);
 593                 memcpy(vcpu->arch.vr, t->vr_state.vr, sizeof(vcpu->arch.vr));
 594                 vcpu->arch.vscr = t->vr_state.vscr;
 595         }
 596 #endif
 597
 598         vcpu->arch.guest_owned_ext &= ~(msr | MSR_VSX);
 599         kvmppc_recalc_shadow_msr(vcpu);
 600 }
 601
 602 static int kvmppc_read_inst(struct kvm_vcpu *vcpu)
 603 {
 604         ulong srr0 = kvmppc_get_pc(vcpu);
 605         u32 last_inst = kvmppc_get_last_inst(vcpu);
 606         int ret;
 607
 608         ret = kvmppc_ld(vcpu, &srr0, sizeof(u32), &last_inst, false);
 609         if (ret == -ENOENT) {
 610                 ulong msr = vcpu->arch.shared->msr;
 611
 612                 msr = kvmppc_set_field(msr, 33, 33, 1);
 613                 msr = kvmppc_set_field(msr, 34, 36, 0);
 614                 vcpu->arch.shared->msr = kvmppc_set_field(msr, 42, 47, 0);
 615                 kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_INST_STORAGE);
 616                 return EMULATE_AGAIN;
 617         }
 618
 619         return EMULATE_DONE;
 620 }
 621
 622 static int kvmppc_check_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr)
 623 {
 624
 625         /* Need to do paired single emulation? */
 626         if (!(vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE))
 627                 return EMULATE_DONE;
 628
 629         /* Read out the instruction */
 630         if (kvmppc_read_inst(vcpu) == EMULATE_DONE)
 631                 /* Need to emulate */
 632                 return EMULATE_FAIL;
 633
 634         return EMULATE_AGAIN;
 635 }
 636
 637 /* Handle external providers (FPU, Altivec, VSX) */
 638 static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
 639                              ulong msr)
 640 {
 641         struct thread_struct *t = &current->thread;
 642         u64 *vcpu_fpr = vcpu->arch.fpr;
 643 #ifdef CONFIG_VSX
 644         u64 *vcpu_vsx = vcpu->arch.vsr;
 645 #endif
 646         u64 *thread_fpr = &t->fp_state.fpr[0][0];
 647         int i;
 648
 649         /* When we have paired singles, we emulate in software */
 650         if (vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE)
 651                 return RESUME_GUEST;
 652
 653         if (!(vcpu->arch.shared->msr & msr)) {
 654                 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 655                 return RESUME_GUEST;
 656         }
 657
 658         if (msr == MSR_VSX) {
 659                 /* No VSX?  Give an illegal instruction interrupt */
 660 #ifdef CONFIG_VSX
 661                 if (!cpu_has_feature(CPU_FTR_VSX))
 662 #endif
 663                 {
 664                         kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
 665                         return RESUME_GUEST;
 666                 }
 667
 668                 /*
 669                  * We have to load up all the FP and VMX registers before
 670                  * we can let the guest use VSX instructions.
 671                  */
 672                 msr = MSR_FP | MSR_VEC | MSR_VSX;
 673         }
 674
 675         /* See if we already own all the ext(s) needed */
 676         msr &= ~vcpu->arch.guest_owned_ext;
 677         if (!msr)
 678                 return RESUME_GUEST;
 679
 680 #ifdef DEBUG_EXT
 681         printk(KERN_INFO "Loading up ext 0x%lx\n", msr);
 682 #endif
 683
 684         if (msr & MSR_FP) {
 685                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++)
 686                         thread_fpr[get_fpr_index(i)] = vcpu_fpr[i];
 687 #ifdef CONFIG_VSX
 688                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.vsr) / 2; i++)
 689                         thread_fpr[get_fpr_index(i) + 1] = vcpu_vsx[i];
 690 #endif
 691                 t->fp_state.fpscr = vcpu->arch.fpscr;
 692                 t->fpexc_mode = 0;
 693                 kvmppc_load_up_fpu();
 694         }
 695
 696         if (msr & MSR_VEC) {
 697 #ifdef CONFIG_ALTIVEC
 698                 memcpy(t->vr_state.vr, vcpu->arch.vr, sizeof(vcpu->arch.vr));
 699                 t->vr_state.vscr = vcpu->arch.vscr;
 700                 t->vrsave = -1;
 701                 kvmppc_load_up_altivec();
 702 #endif
 703         }
 704
 705         current->thread.regs->msr |= msr;
 706         vcpu->arch.guest_owned_ext |= msr;
 707         kvmppc_recalc_shadow_msr(vcpu);
 708
 709         return RESUME_GUEST;
 710 }
 711
 712 /*
 713  * Kernel code using FP or VMX could have flushed guest state to
 714  * the thread_struct; if so, get it back now.
 715  */
 716 static void kvmppc_handle_lost_ext(struct kvm_vcpu *vcpu)
 717 {
 718         unsigned long lost_ext;
 719
 720         lost_ext = vcpu->arch.guest_owned_ext & ~current->thread.regs->msr;
 721         if (!lost_ext)
 722                 return;
 723
 724         if (lost_ext & MSR_FP)
 725                 kvmppc_load_up_fpu();
 726 #ifdef CONFIG_ALTIVEC
 727         if (lost_ext & MSR_VEC)
 728                 kvmppc_load_up_altivec();
 729 #endif
 730         current->thread.regs->msr |= lost_ext;
 731 }
 732
 733 int kvmppc_handle_exit_pr(struct kvm_run *run, struct kvm_vcpu *vcpu,
 734                           unsigned int exit_nr)
 735 {
 736         int r = RESUME_HOST;
 737         int s;
 738
 739         vcpu->stat.sum_exits++;
 740
 741         run->exit_reason = KVM_EXIT_UNKNOWN;
 742         run->ready_for_interrupt_injection = 1;
 743
 744         /* We get here with MSR.EE=1 */
 745
 746         trace_kvm_exit(exit_nr, vcpu);
 747         kvm_guest_exit();
 748
 749         switch (exit_nr) {
 750         case BOOK3S_INTERRUPT_INST_STORAGE:
 751         {
 752                 ulong shadow_srr1 = vcpu->arch.shadow_srr1;
 753                 vcpu->stat.pf_instruc++;
 754
 755 #ifdef CONFIG_PPC_BOOK3S_32
 756                 /* We set segments as unused segments when invalidating them. So
 757                  * treat the respective fault as segment fault. */
 758                 {
 759                         struct kvmppc_book3s_shadow_vcpu *svcpu;
 760                         u32 sr;
 761
 762                         svcpu = svcpu_get(vcpu);
 763                         sr = svcpu->sr[kvmppc_get_pc(vcpu) >> SID_SHIFT];
 764                         svcpu_put(svcpu);
 765                         if (sr == SR_INVALID) {
 766                                 kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
 767                                 r = RESUME_GUEST;
 768                                 break;
 769                         }
 770                 }
 771 #endif
 772
 773                 /* only care about PTEG not found errors, but leave NX alone */
 774                 if (shadow_srr1 & 0x40000000) {
 775                         int idx = srcu_read_lock(&vcpu->kvm->srcu);
 776                         r = kvmppc_handle_pagefault(run, vcpu, kvmppc_get_pc(vcpu), exit_nr);
 777                         srcu_read_unlock(&vcpu->kvm->srcu, idx);
 778                         vcpu->stat.sp_instruc++;
 779                 } else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
 780                           (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
 781                         /*
 782                          * XXX If we do the dcbz hack we use the NX bit to flush&patch the page,
 783                          *     so we can't use the NX bit inside the guest. Let's cross our fingers,
 784                          *     that no guest that needs the dcbz hack does NX.
 785                          */
 786                         kvmppc_mmu_pte_flush(vcpu, kvmppc_get_pc(vcpu), ~0xFFFUL);
 787                         r = RESUME_GUEST;
 788                 } else {
 789                         vcpu->arch.shared->msr |= shadow_srr1 & 0x58000000;
 790                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 791                         r = RESUME_GUEST;
 792                 }
 793                 break;
 794         }
 795         case BOOK3S_INTERRUPT_DATA_STORAGE:
 796         {
 797                 ulong dar = kvmppc_get_fault_dar(vcpu);
 798                 u32 fault_dsisr = vcpu->arch.fault_dsisr;
 799                 vcpu->stat.pf_storage++;
 800
 801 #ifdef CONFIG_PPC_BOOK3S_32
 802                 /* We set segments as unused segments when invalidating them. So
 803                  * treat the respective fault as segment fault. */
 804                 {
 805                         struct kvmppc_book3s_shadow_vcpu *svcpu;
 806                         u32 sr;
 807
 808                         svcpu = svcpu_get(vcpu);
 809                         sr = svcpu->sr[dar >> SID_SHIFT];
 810                         svcpu_put(svcpu);
 811                         if (sr == SR_INVALID) {
 812                                 kvmppc_mmu_map_segment(vcpu, dar);
 813                                 r = RESUME_GUEST;
 814                                 break;
 815                         }
 816                 }
 817 #endif
 818
 819                 /*
 820                  * We need to handle missing shadow PTEs, and
 821                  * protection faults due to us mapping a page read-only
 822                  * when the guest thinks it is writable.
 823                  */
 824                 if (fault_dsisr & (DSISR_NOHPTE | DSISR_PROTFAULT)) {
 825                         int idx = srcu_read_lock(&vcpu->kvm->srcu);
 826                         r = kvmppc_handle_pagefault(run, vcpu, dar, exit_nr);
 827                         srcu_read_unlock(&vcpu->kvm->srcu, idx);
 828                 } else {
 829                         vcpu->arch.shared->dar = dar;
 830                         vcpu->arch.shared->dsisr = fault_dsisr;
 831                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 832                         r = RESUME_GUEST;
 833                 }
 834                 break;
 835         }
 836         case BOOK3S_INTERRUPT_DATA_SEGMENT:
 837                 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_fault_dar(vcpu)) < 0) {
 838                         vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
 839                         kvmppc_book3s_queue_irqprio(vcpu,
 840                                 BOOK3S_INTERRUPT_DATA_SEGMENT);
 841                 }
 842                 r = RESUME_GUEST;
 843                 break;
 844         case BOOK3S_INTERRUPT_INST_SEGMENT:
 845                 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu)) < 0) {
 846                         kvmppc_book3s_queue_irqprio(vcpu,
 847                                 BOOK3S_INTERRUPT_INST_SEGMENT);
 848                 }
 849                 r = RESUME_GUEST;
 850                 break;
 851         /* We're good on these - the host merely wanted to get our attention */
 852         case BOOK3S_INTERRUPT_DECREMENTER:
 853         case BOOK3S_INTERRUPT_HV_DECREMENTER:
 854                 vcpu->stat.dec_exits++;
 855                 r = RESUME_GUEST;
 856                 break;
 857         case BOOK3S_INTERRUPT_EXTERNAL:
 858         case BOOK3S_INTERRUPT_EXTERNAL_LEVEL:
 859         case BOOK3S_INTERRUPT_EXTERNAL_HV:
 860                 vcpu->stat.ext_intr_exits++;
 861                 r = RESUME_GUEST;
 862                 break;
 863         case BOOK3S_INTERRUPT_PERFMON:
 864                 r = RESUME_GUEST;
 865                 break;
 866         case BOOK3S_INTERRUPT_PROGRAM:
 867         case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
 868         {
 869                 enum emulation_result er;
 870                 ulong flags;
 871
 872 program_interrupt:
 873                 flags = vcpu->arch.shadow_srr1 & 0x1f0000ull;
 874
 875                 if (vcpu->arch.shared->msr & MSR_PR) {
 876 #ifdef EXIT_DEBUG
 877                         printk(KERN_INFO "Userspace triggered 0x700 exception at 0x%lx (0x%x)\n", kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu));
 878 #endif
 879                         if ((kvmppc_get_last_inst(vcpu) & 0xff0007ff) !=
 880                             (INS_DCBZ & 0xfffffff7)) {
 881                                 kvmppc_core_queue_program(vcpu, flags);
 882                                 r = RESUME_GUEST;
 883                                 break;
 884                         }
 885                 }
 886
 887                 vcpu->stat.emulated_inst_exits++;
 888                 er = kvmppc_emulate_instruction(run, vcpu);
 889                 switch (er) {
 890                 case EMULATE_DONE:
 891                         r = RESUME_GUEST_NV;
 892                         break;
 893                 case EMULATE_AGAIN:
 894                         r = RESUME_GUEST;
 895                         break;
 896                 case EMULATE_FAIL:
 897                         printk(KERN_CRIT "%s: emulation at %lx failed (%08x)\n",
 898                                __func__, kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu));
 899                         kvmppc_core_queue_program(vcpu, flags);
 900                         r = RESUME_GUEST;
 901                         break;
 902                 case EMULATE_DO_MMIO:
 903                         run->exit_reason = KVM_EXIT_MMIO;
 904                         r = RESUME_HOST_NV;
 905                         break;
 906                 case EMULATE_EXIT_USER:
 907                         r = RESUME_HOST_NV;
 908                         break;
 909                 default:
 910                         BUG();
 911                 }
 912                 break;
 913         }
 914         case BOOK3S_INTERRUPT_SYSCALL:
 915                 if (vcpu->arch.papr_enabled &&
 916                     (kvmppc_get_last_sc(vcpu) == 0x44000022) &&
 917                     !(vcpu->arch.shared->msr & MSR_PR)) {
 918                         /* SC 1 papr hypercalls */
 919                         ulong cmd = kvmppc_get_gpr(vcpu, 3);
 920                         int i;
 921
 922 #ifdef CONFIG_PPC_BOOK3S_64
 923                         if (kvmppc_h_pr(vcpu, cmd) == EMULATE_DONE) {
 924                                 r = RESUME_GUEST;
 925                                 break;
 926                         }
 927 #endif
 928
 929                         run->papr_hcall.nr = cmd;
 930                         for (i = 0; i < 9; ++i) {
 931                                 ulong gpr = kvmppc_get_gpr(vcpu, 4 + i);
 932                                 run->papr_hcall.args[i] = gpr;
 933                         }
 934                         run->exit_reason = KVM_EXIT_PAPR_HCALL;
 935                         vcpu->arch.hcall_needed = 1;
 936                         r = RESUME_HOST;
 937                 } else if (vcpu->arch.osi_enabled &&
 938                     (((u32)kvmppc_get_gpr(vcpu, 3)) == OSI_SC_MAGIC_R3) &&
 939                     (((u32)kvmppc_get_gpr(vcpu, 4)) == OSI_SC_MAGIC_R4)) {
 940                         /* MOL hypercalls */
 941                         u64 *gprs = run->osi.gprs;
 942                         int i;
 943
 944                         run->exit_reason = KVM_EXIT_OSI;
 945                         for (i = 0; i < 32; i++)
 946                                 gprs[i] = kvmppc_get_gpr(vcpu, i);
 947                         vcpu->arch.osi_needed = 1;
 948                         r = RESUME_HOST_NV;
 949                 } else if (!(vcpu->arch.shared->msr & MSR_PR) &&
 950                     (((u32)kvmppc_get_gpr(vcpu, 0)) == KVM_SC_MAGIC_R0)) {
 951                         /* KVM PV hypercalls */
 952                         kvmppc_set_gpr(vcpu, 3, kvmppc_kvm_pv(vcpu));
 953                         r = RESUME_GUEST;
 954                 } else {
 955                         /* Guest syscalls */
 956                         vcpu->stat.syscall_exits++;
 957                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 958                         r = RESUME_GUEST;
 959                 }
 960                 break;
 961         case BOOK3S_INTERRUPT_FP_UNAVAIL:
 962         case BOOK3S_INTERRUPT_ALTIVEC:
 963         case BOOK3S_INTERRUPT_VSX:
 964         {
 965                 int ext_msr = 0;
 966
 967                 switch (exit_nr) {
 968                 case BOOK3S_INTERRUPT_FP_UNAVAIL: ext_msr = MSR_FP;  break;
 969                 case BOOK3S_INTERRUPT_ALTIVEC:    ext_msr = MSR_VEC; break;
 970                 case BOOK3S_INTERRUPT_VSX:        ext_msr = MSR_VSX; break;
 971                 }
 972
 973                 switch (kvmppc_check_ext(vcpu, exit_nr)) {
 974                 case EMULATE_DONE:
 975                         /* everything ok - let's enable the ext */
 976                         r = kvmppc_handle_ext(vcpu, exit_nr, ext_msr);
 977                         break;
 978                 case EMULATE_FAIL:
 979                         /* we need to emulate this instruction */
 980                         goto program_interrupt;
 981                         break;
 982                 default:
 983                         /* nothing to worry about - go again */
 984                         break;
 985                 }
 986                 break;
 987         }
 988         case BOOK3S_INTERRUPT_ALIGNMENT:
 989                 if (kvmppc_read_inst(vcpu) == EMULATE_DONE) {
 990                         vcpu->arch.shared->dsisr = kvmppc_alignment_dsisr(vcpu,
 991                                 kvmppc_get_last_inst(vcpu));
 992                         vcpu->arch.shared->dar = kvmppc_alignment_dar(vcpu,
 993                                 kvmppc_get_last_inst(vcpu));
 994                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 995                 }
 996                 r = RESUME_GUEST;
 997                 break;
 998         case BOOK3S_INTERRUPT_MACHINE_CHECK:
 999         case BOOK3S_INTERRUPT_TRACE:
1000                 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
1001                 r = RESUME_GUEST;
1002                 break;
1003         default:
1004         {
1005                 ulong shadow_srr1 = vcpu->arch.shadow_srr1;
1006                 /* Ugh - bork here! What did we get? */
1007                 printk(KERN_EMERG "exit_nr=0x%x | pc=0x%lx | msr=0x%lx\n",
1008                         exit_nr, kvmppc_get_pc(vcpu), shadow_srr1);
1009                 r = RESUME_HOST;
1010                 BUG();
1011                 break;
1012         }
1013         }
1014
1015         if (!(r & RESUME_HOST)) {
1016                 /* To avoid clobbering exit_reason, only check for signals if
1017                  * we aren't already exiting to userspace for some other
1018                  * reason. */
1019
1020                 /*
1021                  * Interrupts could be timers for the guest which we have to
1022                  * inject again, so let's postpone them until we're in the guest
1023                  * and if we really did time things so badly, then we just exit
1024                  * again due to a host external interrupt.
1025                  */
1026                 local_irq_disable();
1027                 s = kvmppc_prepare_to_enter(vcpu);
1028                 if (s <= 0) {
1029                         local_irq_enable();
1030                         r = s;
1031                 } else {
1032                         kvmppc_fix_ee_before_entry();
1033                 }
1034                 kvmppc_handle_lost_ext(vcpu);
1035         }
1036
1037         trace_kvm_book3s_reenter(r, vcpu);
1038
1039         return r;
1040 }
1041
1042 static int kvm_arch_vcpu_ioctl_get_sregs_pr(struct kvm_vcpu *vcpu,
1043                                             struct kvm_sregs *sregs)
1044 {
1045         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
1046         int i;
1047
1048         sregs->pvr = vcpu->arch.pvr;
1049
1050         sregs->u.s.sdr1 = to_book3s(vcpu)->sdr1;
1051         if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) {
1052                 for (i = 0; i < 64; i++) {
1053                         sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige | i;
1054                         sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
1055                 }
1056         } else {
1057                 for (i = 0; i < 16; i++)
1058                         sregs->u.s.ppc32.sr[i] = vcpu->arch.shared->sr[i];
1059
1060                 for (i = 0; i < 8; i++) {
1061                         sregs->u.s.ppc32.ibat[i] = vcpu3s->ibat[i].raw;
1062                         sregs->u.s.ppc32.dbat[i] = vcpu3s->dbat[i].raw;
1063                 }
1064         }
1065
1066         return 0;
1067 }
1068
1069 static int kvm_arch_vcpu_ioctl_set_sregs_pr(struct kvm_vcpu *vcpu,
1070                                             struct kvm_sregs *sregs)
1071 {
1072         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
1073         int i;
1074
1075         kvmppc_set_pvr_pr(vcpu, sregs->pvr);
1076
1077         vcpu3s->sdr1 = sregs->u.s.sdr1;
1078         if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) {
1079                 for (i = 0; i < 64; i++) {
1080                         vcpu->arch.mmu.slbmte(vcpu, sregs->u.s.ppc64.slb[i].slbv,
1081                                                     sregs->u.s.ppc64.slb[i].slbe);
1082                 }
1083         } else {
1084                 for (i = 0; i < 16; i++) {
1085                         vcpu->arch.mmu.mtsrin(vcpu, i, sregs->u.s.ppc32.sr[i]);
1086                 }
1087                 for (i = 0; i < 8; i++) {
1088                         kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), false,
1089                                        (u32)sregs->u.s.ppc32.ibat[i]);
1090                         kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), true,
1091                                        (u32)(sregs->u.s.ppc32.ibat[i] >> 32));
1092                         kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), false,
1093                                        (u32)sregs->u.s.ppc32.dbat[i]);
1094                         kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), true,
1095                                        (u32)(sregs->u.s.ppc32.dbat[i] >> 32));
1096                 }
1097         }
1098
1099         /* Flush the MMU after messing with the segments */
1100         kvmppc_mmu_pte_flush(vcpu, 0, 0);
1101
1102         return 0;
1103 }
1104
1105 static int kvmppc_get_one_reg_pr(struct kvm_vcpu *vcpu, u64 id,
1106                                  union kvmppc_one_reg *val)
1107 {
1108         int r = 0;
1109
1110         switch (id) {
1111         case KVM_REG_PPC_HIOR:
1112                 *val = get_reg_val(id, to_book3s(vcpu)->hior);
1113                 break;
1114 #ifdef CONFIG_VSX
1115         case KVM_REG_PPC_VSR0 ... KVM_REG_PPC_VSR31: {
1116                 long int i = id - KVM_REG_PPC_VSR0;
1117
1118                 if (!cpu_has_feature(CPU_FTR_VSX)) {
1119                         r = -ENXIO;
1120                         break;
1121                 }
1122                 val->vsxval[0] = vcpu->arch.fpr[i];
1123                 val->vsxval[1] = vcpu->arch.vsr[i];
1124                 break;
1125         }
1126 #endif /* CONFIG_VSX */
1127         default:
1128                 r = -EINVAL;
1129                 break;
1130         }
1131
1132         return r;
1133 }
1134
1135 static int kvmppc_set_one_reg_pr(struct kvm_vcpu *vcpu, u64 id,
1136                                  union kvmppc_one_reg *val)
1137 {
1138         int r = 0;
1139
1140         switch (id) {
1141         case KVM_REG_PPC_HIOR:
1142                 to_book3s(vcpu)->hior = set_reg_val(id, *val);
1143                 to_book3s(vcpu)->hior_explicit = true;
1144                 break;
1145 #ifdef CONFIG_VSX
1146         case KVM_REG_PPC_VSR0 ... KVM_REG_PPC_VSR31: {
1147                 long int i = id - KVM_REG_PPC_VSR0;
1148
1149                 if (!cpu_has_feature(CPU_FTR_VSX)) {
1150                         r = -ENXIO;
1151                         break;
1152                 }
1153                 vcpu->arch.fpr[i] = val->vsxval[0];
1154                 vcpu->arch.vsr[i] = val->vsxval[1];
1155                 break;
1156         }
1157 #endif /* CONFIG_VSX */
1158         default:
1159                 r = -EINVAL;
1160                 break;
1161         }
1162
1163         return r;
1164 }
1165
1166 static struct kvm_vcpu *kvmppc_core_vcpu_create_pr(struct kvm *kvm,
1167                                                    unsigned int id)
1168 {
1169         struct kvmppc_vcpu_book3s *vcpu_book3s;
1170         struct kvm_vcpu *vcpu;
1171         int err = -ENOMEM;
1172         unsigned long p;
1173
1174         vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
1175         if (!vcpu)
1176                 goto out;
1177
1178         vcpu_book3s = vzalloc(sizeof(struct kvmppc_vcpu_book3s));
1179         if (!vcpu_book3s)
1180                 goto free_vcpu;
1181         vcpu->arch.book3s = vcpu_book3s;
1182
1183 #ifdef CONFIG_KVM_BOOK3S_32
1184         vcpu->arch.shadow_vcpu =
1185                 kzalloc(sizeof(*vcpu->arch.shadow_vcpu), GFP_KERNEL);
1186         if (!vcpu->arch.shadow_vcpu)
1187                 goto free_vcpu3s;
1188 #endif
1189
1190         err = kvm_vcpu_init(vcpu, kvm, id);
1191         if (err)
1192                 goto free_shadow_vcpu;
1193
1194         err = -ENOMEM;
1195         p = __get_free_page(GFP_KERNEL|__GFP_ZERO);
1196         if (!p)
1197                 goto uninit_vcpu;
1198         /* the real shared page fills the last 4k of our page */
1199         vcpu->arch.shared = (void *)(p + PAGE_SIZE - 4096);
1200
1201 #ifdef CONFIG_PPC_BOOK3S_64
1202         /*
1203          * Default to the same as the host if we're on sufficiently
1204          * recent machine that we have 1TB segments;
1205          * otherwise default to PPC970FX.
1206          */
1207         vcpu->arch.pvr = 0x3C0301;
1208         if (mmu_has_feature(MMU_FTR_1T_SEGMENT))
1209                 vcpu->arch.pvr = mfspr(SPRN_PVR);
1210 #else
1211         /* default to book3s_32 (750) */
1212         vcpu->arch.pvr = 0x84202;
1213 #endif
1214         kvmppc_set_pvr_pr(vcpu, vcpu->arch.pvr);
1215         vcpu->arch.slb_nr = 64;
1216
1217         vcpu->arch.shadow_msr = MSR_USER64;
1218
1219         err = kvmppc_mmu_init(vcpu);
1220         if (err < 0)
1221                 goto uninit_vcpu;
1222
1223         return vcpu;
1224
1225 uninit_vcpu:
1226         kvm_vcpu_uninit(vcpu);
1227 free_shadow_vcpu:
1228 #ifdef CONFIG_KVM_BOOK3S_32
1229         kfree(vcpu->arch.shadow_vcpu);
1230 free_vcpu3s:
1231 #endif
1232         vfree(vcpu_book3s);
1233 free_vcpu:
1234         kmem_cache_free(kvm_vcpu_cache, vcpu);
1235 out:
1236         return ERR_PTR(err);
1237 }
1238
1239 static void kvmppc_core_vcpu_free_pr(struct kvm_vcpu *vcpu)
1240 {
1241         struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
1242
1243         free_page((unsigned long)vcpu->arch.shared & PAGE_MASK);
1244         kvm_vcpu_uninit(vcpu);
1245 #ifdef CONFIG_KVM_BOOK3S_32
1246         kfree(vcpu->arch.shadow_vcpu);
1247 #endif
1248         vfree(vcpu_book3s);
1249         kmem_cache_free(kvm_vcpu_cache, vcpu);
1250 }
1251
1252 static int kvmppc_vcpu_run_pr(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
1253 {
1254         int ret;
1255         struct thread_fp_state fp;
1256         int fpexc_mode;
1257 #ifdef CONFIG_ALTIVEC
1258         struct thread_vr_state vr;
1259         unsigned long uninitialized_var(vrsave);
1260         int used_vr;
1261 #endif
1262 #ifdef CONFIG_VSX
1263         int used_vsr;
1264 #endif
1265         ulong ext_msr;
1266
1267         /* Check if we can run the vcpu at all */
1268         if (!vcpu->arch.sane) {
1269                 kvm_run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1270                 ret = -EINVAL;
1271                 goto out;
1272         }
1273
1274         /*
1275          * Interrupts could be timers for the guest which we have to inject
1276          * again, so let's postpone them until we're in the guest and if we
1277          * really did time things so badly, then we just exit again due to
1278          * a host external interrupt.
1279          */
1280         local_irq_disable();
1281         ret = kvmppc_prepare_to_enter(vcpu);
1282         if (ret <= 0) {
1283                 local_irq_enable();
1284                 goto out;
1285         }
1286
1287         /* Save FPU state in stack */
1288         if (current->thread.regs->msr & MSR_FP)
1289                 giveup_fpu(current);
1290         fp = current->thread.fp_state;
1291         fpexc_mode = current->thread.fpexc_mode;
1292
1293 #ifdef CONFIG_ALTIVEC
1294         /* Save Altivec state in stack */
1295         used_vr = current->thread.used_vr;
1296         if (used_vr) {
1297                 if (current->thread.regs->msr & MSR_VEC)
1298                         giveup_altivec(current);
1299                 vr = current->thread.vr_state;
1300                 vrsave = current->thread.vrsave;
1301         }
1302 #endif
1303
1304 #ifdef CONFIG_VSX
1305         /* Save VSX state in stack */
1306         used_vsr = current->thread.used_vsr;
1307         if (used_vsr && (current->thread.regs->msr & MSR_VSX))
1308                 __giveup_vsx(current);
1309 #endif
1310
1311         /* Remember the MSR with disabled extensions */
1312         ext_msr = current->thread.regs->msr;
1313
1314         /* Preload FPU if it's enabled */
1315         if (vcpu->arch.shared->msr & MSR_FP)
1316                 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
1317
1318         kvmppc_fix_ee_before_entry();
1319
1320         ret = __kvmppc_vcpu_run(kvm_run, vcpu);
1321
1322         /* No need for kvm_guest_exit. It's done in handle_exit.
1323            We also get here with interrupts enabled. */
1324
1325         /* Make sure we save the guest FPU/Altivec/VSX state */
1326         kvmppc_giveup_ext(vcpu, MSR_FP | MSR_VEC | MSR_VSX);
1327
1328         current->thread.regs->msr = ext_msr;
1329
1330         /* Restore FPU/VSX state from stack */
1331         current->thread.fp_state = fp;
1332         current->thread.fpexc_mode = fpexc_mode;
1333
1334 #ifdef CONFIG_ALTIVEC
1335         /* Restore Altivec state from stack */
1336         if (used_vr && current->thread.used_vr) {
1337                 current->thread.vr_state = vr;
1338                 current->thread.vrsave = vrsave;
1339         }
1340         current->thread.used_vr = used_vr;
1341 #endif
1342
1343 #ifdef CONFIG_VSX
1344         current->thread.used_vsr = used_vsr;
1345 #endif
1346
1347 out:
1348         vcpu->mode = OUTSIDE_GUEST_MODE;
1349         return ret;
1350 }
1351
1352 /*
1353  * Get (and clear) the dirty memory log for a memory slot.
1354  */
1355 static int kvm_vm_ioctl_get_dirty_log_pr(struct kvm *kvm,
1356                                          struct kvm_dirty_log *log)
1357 {
1358         struct kvm_memory_slot *memslot;
1359         struct kvm_vcpu *vcpu;
1360         ulong ga, ga_end;
1361         int is_dirty = 0;
1362         int r;
1363         unsigned long n;
1364
1365         mutex_lock(&kvm->slots_lock);
1366
1367         r = kvm_get_dirty_log(kvm, log, &is_dirty);
1368         if (r)
1369                 goto out;
1370
1371         /* If nothing is dirty, don't bother messing with page tables. */
1372         if (is_dirty) {
1373                 memslot = id_to_memslot(kvm->memslots, log->slot);
1374
1375                 ga = memslot->base_gfn << PAGE_SHIFT;
1376                 ga_end = ga + (memslot->npages << PAGE_SHIFT);
1377
1378                 kvm_for_each_vcpu(n, vcpu, kvm)
1379                         kvmppc_mmu_pte_pflush(vcpu, ga, ga_end);
1380
1381                 n = kvm_dirty_bitmap_bytes(memslot);
1382                 memset(memslot->dirty_bitmap, 0, n);
1383         }
1384
1385         r = 0;
1386 out:
1387         mutex_unlock(&kvm->slots_lock);
1388         return r;
1389 }
1390
1391 static void kvmppc_core_flush_memslot_pr(struct kvm *kvm,
1392                                          struct kvm_memory_slot *memslot)
1393 {
1394         return;
1395 }
1396
1397 static int kvmppc_core_prepare_memory_region_pr(struct kvm *kvm,
1398                                         struct kvm_memory_slot *memslot,
1399                                         struct kvm_userspace_memory_region *mem)
1400 {
1401         return 0;
1402 }
1403
1404 static void kvmppc_core_commit_memory_region_pr(struct kvm *kvm,
1405                                 struct kvm_userspace_memory_region *mem,
1406                                 const struct kvm_memory_slot *old)
1407 {
1408         return;
1409 }
1410
1411 static void kvmppc_core_free_memslot_pr(struct kvm_memory_slot *free,
1412                                         struct kvm_memory_slot *dont)
1413 {
1414         return;
1415 }
1416
1417 static int kvmppc_core_create_memslot_pr(struct kvm_memory_slot *slot,
1418                                          unsigned long npages)
1419 {
1420         return 0;
1421 }
1422
1423
1424 #ifdef CONFIG_PPC64
1425 static int kvm_vm_ioctl_get_smmu_info_pr(struct kvm *kvm,
1426                                          struct kvm_ppc_smmu_info *info)
1427 {
1428         long int i;
1429         struct kvm_vcpu *vcpu;
1430
1431         info->flags = 0;
1432
1433         /* SLB is always 64 entries */
1434         info->slb_size = 64;
1435
1436         /* Standard 4k base page size segment */
1437         info->sps[0].page_shift = 12;
1438         info->sps[0].slb_enc = 0;
1439         info->sps[0].enc[0].page_shift = 12;
1440         info->sps[0].enc[0].pte_enc = 0;
1441
1442         /*
1443          * 64k large page size.
1444          * We only want to put this in if the CPUs we're emulating
1445          * support it, but unfortunately we don't have a vcpu easily
1446          * to hand here to test.  Just pick the first vcpu, and if
1447          * that doesn't exist yet, report the minimum capability,
1448          * i.e., no 64k pages.
1449          * 1T segment support goes along with 64k pages.
1450          */
1451         i = 1;
1452         vcpu = kvm_get_vcpu(kvm, 0);
1453         if (vcpu && (vcpu->arch.hflags & BOOK3S_HFLAG_MULTI_PGSIZE)) {
1454                 info->flags = KVM_PPC_1T_SEGMENTS;
1455                 info->sps[i].page_shift = 16;
1456                 info->sps[i].slb_enc = SLB_VSID_L | SLB_VSID_LP_01;
1457                 info->sps[i].enc[0].page_shift = 16;
1458                 info->sps[i].enc[0].pte_enc = 1;
1459                 ++i;
1460         }
1461
1462         /* Standard 16M large page size segment */
1463         info->sps[i].page_shift = 24;
1464         info->sps[i].slb_enc = SLB_VSID_L;
1465         info->sps[i].enc[0].page_shift = 24;
1466         info->sps[i].enc[0].pte_enc = 0;
1467
1468         return 0;
1469 }
1470 #else
1471 static int kvm_vm_ioctl_get_smmu_info_pr(struct kvm *kvm,
1472                                          struct kvm_ppc_smmu_info *info)
1473 {
1474         /* We should not get called */
1475         BUG();
1476 }
1477 #endif /* CONFIG_PPC64 */
1478
1479 static unsigned int kvm_global_user_count = 0;
1480 static DEFINE_SPINLOCK(kvm_global_user_count_lock);
1481
1482 static int kvmppc_core_init_vm_pr(struct kvm *kvm)
1483 {
1484         mutex_init(&kvm->arch.hpt_mutex);
1485
1486         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
1487                 spin_lock(&kvm_global_user_count_lock);
1488                 if (++kvm_global_user_count == 1)
1489                         pSeries_disable_reloc_on_exc();
1490                 spin_unlock(&kvm_global_user_count_lock);
1491         }
1492         return 0;
1493 }
1494
1495 static void kvmppc_core_destroy_vm_pr(struct kvm *kvm)
1496 {
1497 #ifdef CONFIG_PPC64
1498         WARN_ON(!list_empty(&kvm->arch.spapr_tce_tables));
1499 #endif
1500
1501         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
1502                 spin_lock(&kvm_global_user_count_lock);
1503                 BUG_ON(kvm_global_user_count == 0);
1504                 if (--kvm_global_user_count == 0)
1505                         pSeries_enable_reloc_on_exc();
1506                 spin_unlock(&kvm_global_user_count_lock);
1507         }
1508 }
1509
1510 static int kvmppc_core_check_processor_compat_pr(void)
1511 {
1512         /* we are always compatible */
1513         return 0;
1514 }
1515
1516 static long kvm_arch_vm_ioctl_pr(struct file *filp,
1517                                  unsigned int ioctl, unsigned long arg)
1518 {
1519         return -ENOTTY;
1520 }
1521
1522 static struct kvmppc_ops kvm_ops_pr = {
1523         .get_sregs = kvm_arch_vcpu_ioctl_get_sregs_pr,
1524         .set_sregs = kvm_arch_vcpu_ioctl_set_sregs_pr,
1525         .get_one_reg = kvmppc_get_one_reg_pr,
1526         .set_one_reg = kvmppc_set_one_reg_pr,
1527         .vcpu_load   = kvmppc_core_vcpu_load_pr,
1528         .vcpu_put    = kvmppc_core_vcpu_put_pr,
1529         .set_msr     = kvmppc_set_msr_pr,
1530         .vcpu_run    = kvmppc_vcpu_run_pr,
1531         .vcpu_create = kvmppc_core_vcpu_create_pr,
1532         .vcpu_free   = kvmppc_core_vcpu_free_pr,
1533         .check_requests = kvmppc_core_check_requests_pr,
1534         .get_dirty_log = kvm_vm_ioctl_get_dirty_log_pr,
1535         .flush_memslot = kvmppc_core_flush_memslot_pr,
1536         .prepare_memory_region = kvmppc_core_prepare_memory_region_pr,
1537         .commit_memory_region = kvmppc_core_commit_memory_region_pr,
1538         .unmap_hva = kvm_unmap_hva_pr,
1539         .unmap_hva_range = kvm_unmap_hva_range_pr,
1540         .age_hva  = kvm_age_hva_pr,
1541         .test_age_hva = kvm_test_age_hva_pr,
1542         .set_spte_hva = kvm_set_spte_hva_pr,
1543         .mmu_destroy  = kvmppc_mmu_destroy_pr,
1544         .free_memslot = kvmppc_core_free_memslot_pr,
1545         .create_memslot = kvmppc_core_create_memslot_pr,
1546         .init_vm = kvmppc_core_init_vm_pr,
1547         .destroy_vm = kvmppc_core_destroy_vm_pr,
1548         .get_smmu_info = kvm_vm_ioctl_get_smmu_info_pr,
1549         .emulate_op = kvmppc_core_emulate_op_pr,
1550         .emulate_mtspr = kvmppc_core_emulate_mtspr_pr,
1551         .emulate_mfspr = kvmppc_core_emulate_mfspr_pr,
1552         .fast_vcpu_kick = kvm_vcpu_kick,
1553         .arch_vm_ioctl  = kvm_arch_vm_ioctl_pr,
1554 };
1555
1556
1557 int kvmppc_book3s_init_pr(void)
1558 {
1559         int r;
1560
1561         r = kvmppc_core_check_processor_compat_pr();
1562         if (r < 0)
1563                 return r;
1564
1565         kvm_ops_pr.owner = THIS_MODULE;
1566         kvmppc_pr_ops = &kvm_ops_pr;
1567
1568         r = kvmppc_mmu_hpte_sysinit();
1569         return r;
1570 }
1571
1572 void kvmppc_book3s_exit_pr(void)
1573 {
1574         kvmppc_pr_ops = NULL;
1575         kvmppc_mmu_hpte_sysexit();
1576 }
1577
1578 /*
1579  * We only support separate modules for book3s 64
1580  */
1581 #ifdef CONFIG_PPC_BOOK3S_64
1582
1583 module_init(kvmppc_book3s_init_pr);
1584 module_exit(kvmppc_book3s_exit_pr);
1585
1586 MODULE_LICENSE("GPL");
1587 #endif