arch/powerpc/kvm/book3s

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This source file includes following definitions.
kvmppc_is_split_real
kvmppc_fixup_split_real
kvmppc_core_vcpu_load_pr
kvmppc_core_vcpu_put_pr
kvmppc_copy_to_svcpu
kvmppc_recalc_shadow_msr
kvmppc_copy_from_svcpu
kvmppc_save_tm_sprs
kvmppc_restore_tm_sprs
kvmppc_handle_lost_math_exts
kvmppc_save_tm_pr
kvmppc_restore_tm_pr
kvmppc_core_check_requests_pr
do_kvm_unmap_hva
kvm_unmap_hva_range_pr
kvm_age_hva_pr
kvm_test_age_hva_pr
kvm_set_spte_hva_pr
kvmppc_set_msr_pr
kvmppc_set_pvr_pr
kvmppc_patch_dcbz
kvmppc_visible_gpa
kvmppc_handle_pagefault
kvmppc_giveup_ext
kvmppc_giveup_fac
kvmppc_handle_ext
kvmppc_handle_lost_ext
kvmppc_trigger_fac_interrupt
kvmppc_emulate_fac
kvmppc_handle_fac
kvmppc_set_fscr
kvmppc_setup_debug
kvmppc_clear_debug
kvmppc_exit_pr_progint
kvmppc_handle_exit_pr
kvm_arch_vcpu_ioctl_get_sregs_pr
kvm_arch_vcpu_ioctl_set_sregs_pr
kvmppc_get_one_reg_pr
kvmppc_set_lpcr_pr
kvmppc_set_one_reg_pr
kvmppc_core_vcpu_create_pr
kvmppc_core_vcpu_free_pr
kvmppc_vcpu_run_pr
kvm_vm_ioctl_get_dirty_log_pr
kvmppc_core_flush_memslot_pr
kvmppc_core_prepare_memory_region_pr
kvmppc_core_commit_memory_region_pr
kvmppc_core_free_memslot_pr
kvmppc_core_create_memslot_pr
kvm_vm_ioctl_get_smmu_info_pr
kvm_configure_mmu_pr
kvm_vm_ioctl_get_smmu_info_pr
kvmppc_core_init_vm_pr
kvmppc_core_destroy_vm_pr
kvmppc_core_check_processor_compat_pr
kvm_arch_vm_ioctl_pr
kvmppc_book3s_init_pr
kvmppc_book3s_exit_pr
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved.
   4  *
   5  * Authors:
   6  *    Alexander Graf <agraf@suse.de>
   7  *    Kevin Wolf <mail@kevin-wolf.de>
   8  *    Paul Mackerras <paulus@samba.org>
   9  *
  10  * Description:
  11  * Functions relating to running KVM on Book 3S processors where
  12  * we don't have access to hypervisor mode, and we run the guest
  13  * in problem state (user mode).
  14  *
  15  * This file is derived from arch/powerpc/kvm/44x.c,
  16  * by Hollis Blanchard <hollisb@us.ibm.com>.
  17  */
  18 
  19 #include <linux/kvm_host.h>
  20 #include <linux/export.h>
  21 #include <linux/err.h>
  22 #include <linux/slab.h>
  23 
  24 #include <asm/reg.h>
  25 #include <asm/cputable.h>
  26 #include <asm/cacheflush.h>
  27 #include <linux/uaccess.h>
  28 #include <asm/io.h>
  29 #include <asm/kvm_ppc.h>
  30 #include <asm/kvm_book3s.h>
  31 #include <asm/mmu_context.h>
  32 #include <asm/switch_to.h>
  33 #include <asm/firmware.h>
  34 #include <asm/setup.h>
  35 #include <linux/gfp.h>
  36 #include <linux/sched.h>
  37 #include <linux/vmalloc.h>
  38 #include <linux/highmem.h>
  39 #include <linux/module.h>
  40 #include <linux/miscdevice.h>
  41 #include <asm/asm-prototypes.h>
  42 #include <asm/tm.h>
  43 
  44 #include "book3s.h"
  45 
  46 #define CREATE_TRACE_POINTS
  47 #include "trace_pr.h"
  48 
  49 /* #define EXIT_DEBUG */
  50 /* #define DEBUG_EXT */
  51 
  52 static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
  53                              ulong msr);
  54 #ifdef CONFIG_PPC_BOOK3S_64
  55 static int kvmppc_handle_fac(struct kvm_vcpu *vcpu, ulong fac);
  56 #endif
  57 
  58 /* Some compatibility defines */
  59 #ifdef CONFIG_PPC_BOOK3S_32
  60 #define MSR_USER32 MSR_USER
  61 #define MSR_USER64 MSR_USER
  62 #define HW_PAGE_SIZE PAGE_SIZE
  63 #define HPTE_R_M   _PAGE_COHERENT
  64 #endif
  65 
  66 static bool kvmppc_is_split_real(struct kvm_vcpu *vcpu)
  67 {
  68         ulong msr = kvmppc_get_msr(vcpu);
  69         return (msr & (MSR_IR|MSR_DR)) == MSR_DR;
  70 }
  71 
  72 static void kvmppc_fixup_split_real(struct kvm_vcpu *vcpu)
  73 {
  74         ulong msr = kvmppc_get_msr(vcpu);
  75         ulong pc = kvmppc_get_pc(vcpu);
  76 
  77         /* We are in DR only split real mode */
  78         if ((msr & (MSR_IR|MSR_DR)) != MSR_DR)
  79                 return;
  80 
  81         /* We have not fixed up the guest already */
  82         if (vcpu->arch.hflags & BOOK3S_HFLAG_SPLIT_HACK)
  83                 return;
  84 
  85         /* The code is in fixupable address space */
  86         if (pc & SPLIT_HACK_MASK)
  87                 return;
  88 
  89         vcpu->arch.hflags |= BOOK3S_HFLAG_SPLIT_HACK;
  90         kvmppc_set_pc(vcpu, pc | SPLIT_HACK_OFFS);
  91 }
  92 
  93 void kvmppc_unfixup_split_real(struct kvm_vcpu *vcpu);
  94 
  95 static void kvmppc_core_vcpu_load_pr(struct kvm_vcpu *vcpu, int cpu)
  96 {
  97 #ifdef CONFIG_PPC_BOOK3S_64
  98         struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
  99         memcpy(svcpu->slb, to_book3s(vcpu)->slb_shadow, sizeof(svcpu->slb));
 100         svcpu->slb_max = to_book3s(vcpu)->slb_shadow_max;
 101         svcpu->in_use = 0;
 102         svcpu_put(svcpu);
 103 #endif
 104 
 105         /* Disable AIL if supported */
 106         if (cpu_has_feature(CPU_FTR_HVMODE) &&
 107             cpu_has_feature(CPU_FTR_ARCH_207S))
 108                 mtspr(SPRN_LPCR, mfspr(SPRN_LPCR) & ~LPCR_AIL);
 109 
 110         vcpu->cpu = smp_processor_id();
 111 #ifdef CONFIG_PPC_BOOK3S_32
 112         current->thread.kvm_shadow_vcpu = vcpu->arch.shadow_vcpu;
 113 #endif
 114 
 115         if (kvmppc_is_split_real(vcpu))
 116                 kvmppc_fixup_split_real(vcpu);
 117 
 118         kvmppc_restore_tm_pr(vcpu);
 119 }
 120 
 121 static void kvmppc_core_vcpu_put_pr(struct kvm_vcpu *vcpu)
 122 {
 123 #ifdef CONFIG_PPC_BOOK3S_64
 124         struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 125         if (svcpu->in_use) {
 126                 kvmppc_copy_from_svcpu(vcpu);
 127         }
 128         memcpy(to_book3s(vcpu)->slb_shadow, svcpu->slb, sizeof(svcpu->slb));
 129         to_book3s(vcpu)->slb_shadow_max = svcpu->slb_max;
 130         svcpu_put(svcpu);
 131 #endif
 132 
 133         if (kvmppc_is_split_real(vcpu))
 134                 kvmppc_unfixup_split_real(vcpu);
 135 
 136         kvmppc_giveup_ext(vcpu, MSR_FP | MSR_VEC | MSR_VSX);
 137         kvmppc_giveup_fac(vcpu, FSCR_TAR_LG);
 138         kvmppc_save_tm_pr(vcpu);
 139 
 140         /* Enable AIL if supported */
 141         if (cpu_has_feature(CPU_FTR_HVMODE) &&
 142             cpu_has_feature(CPU_FTR_ARCH_207S))
 143                 mtspr(SPRN_LPCR, mfspr(SPRN_LPCR) | LPCR_AIL_3);
 144 
 145         vcpu->cpu = -1;
 146 }
 147 
 148 /* Copy data needed by real-mode code from vcpu to shadow vcpu */
 149 void kvmppc_copy_to_svcpu(struct kvm_vcpu *vcpu)
 150 {
 151         struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 152 
 153         svcpu->gpr[0] = vcpu->arch.regs.gpr[0];
 154         svcpu->gpr[1] = vcpu->arch.regs.gpr[1];
 155         svcpu->gpr[2] = vcpu->arch.regs.gpr[2];
 156         svcpu->gpr[3] = vcpu->arch.regs.gpr[3];
 157         svcpu->gpr[4] = vcpu->arch.regs.gpr[4];
 158         svcpu->gpr[5] = vcpu->arch.regs.gpr[5];
 159         svcpu->gpr[6] = vcpu->arch.regs.gpr[6];
 160         svcpu->gpr[7] = vcpu->arch.regs.gpr[7];
 161         svcpu->gpr[8] = vcpu->arch.regs.gpr[8];
 162         svcpu->gpr[9] = vcpu->arch.regs.gpr[9];
 163         svcpu->gpr[10] = vcpu->arch.regs.gpr[10];
 164         svcpu->gpr[11] = vcpu->arch.regs.gpr[11];
 165         svcpu->gpr[12] = vcpu->arch.regs.gpr[12];
 166         svcpu->gpr[13] = vcpu->arch.regs.gpr[13];
 167         svcpu->cr  = vcpu->arch.regs.ccr;
 168         svcpu->xer = vcpu->arch.regs.xer;
 169         svcpu->ctr = vcpu->arch.regs.ctr;
 170         svcpu->lr  = vcpu->arch.regs.link;
 171         svcpu->pc  = vcpu->arch.regs.nip;
 172 #ifdef CONFIG_PPC_BOOK3S_64
 173         svcpu->shadow_fscr = vcpu->arch.shadow_fscr;
 174 #endif
 175         /*
 176          * Now also save the current time base value. We use this
 177          * to find the guest purr and spurr value.
 178          */
 179         vcpu->arch.entry_tb = get_tb();
 180         vcpu->arch.entry_vtb = get_vtb();
 181         if (cpu_has_feature(CPU_FTR_ARCH_207S))
 182                 vcpu->arch.entry_ic = mfspr(SPRN_IC);
 183         svcpu->in_use = true;
 184 
 185         svcpu_put(svcpu);
 186 }
 187 
 188 static void kvmppc_recalc_shadow_msr(struct kvm_vcpu *vcpu)
 189 {
 190         ulong guest_msr = kvmppc_get_msr(vcpu);
 191         ulong smsr = guest_msr;
 192 
 193         /* Guest MSR values */
 194 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 195         smsr &= MSR_FE0 | MSR_FE1 | MSR_SF | MSR_SE | MSR_BE | MSR_LE |
 196                 MSR_TM | MSR_TS_MASK;
 197 #else
 198         smsr &= MSR_FE0 | MSR_FE1 | MSR_SF | MSR_SE | MSR_BE | MSR_LE;
 199 #endif
 200         /* Process MSR values */
 201         smsr |= MSR_ME | MSR_RI | MSR_IR | MSR_DR | MSR_PR | MSR_EE;
 202         /* External providers the guest reserved */
 203         smsr |= (guest_msr & vcpu->arch.guest_owned_ext);
 204         /* 64-bit Process MSR values */
 205 #ifdef CONFIG_PPC_BOOK3S_64
 206         smsr |= MSR_ISF | MSR_HV;
 207 #endif
 208 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 209         /*
 210          * in guest privileged state, we want to fail all TM transactions.
 211          * So disable MSR TM bit so that all tbegin. will be able to be
 212          * trapped into host.
 213          */
 214         if (!(guest_msr & MSR_PR))
 215                 smsr &= ~MSR_TM;
 216 #endif
 217         vcpu->arch.shadow_msr = smsr;
 218 }
 219 
 220 /* Copy data touched by real-mode code from shadow vcpu back to vcpu */
 221 void kvmppc_copy_from_svcpu(struct kvm_vcpu *vcpu)
 222 {
 223         struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 224 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 225         ulong old_msr;
 226 #endif
 227 
 228         /*
 229          * Maybe we were already preempted and synced the svcpu from
 230          * our preempt notifiers. Don't bother touching this svcpu then.
 231          */
 232         if (!svcpu->in_use)
 233                 goto out;
 234 
 235         vcpu->arch.regs.gpr[0] = svcpu->gpr[0];
 236         vcpu->arch.regs.gpr[1] = svcpu->gpr[1];
 237         vcpu->arch.regs.gpr[2] = svcpu->gpr[2];
 238         vcpu->arch.regs.gpr[3] = svcpu->gpr[3];
 239         vcpu->arch.regs.gpr[4] = svcpu->gpr[4];
 240         vcpu->arch.regs.gpr[5] = svcpu->gpr[5];
 241         vcpu->arch.regs.gpr[6] = svcpu->gpr[6];
 242         vcpu->arch.regs.gpr[7] = svcpu->gpr[7];
 243         vcpu->arch.regs.gpr[8] = svcpu->gpr[8];
 244         vcpu->arch.regs.gpr[9] = svcpu->gpr[9];
 245         vcpu->arch.regs.gpr[10] = svcpu->gpr[10];
 246         vcpu->arch.regs.gpr[11] = svcpu->gpr[11];
 247         vcpu->arch.regs.gpr[12] = svcpu->gpr[12];
 248         vcpu->arch.regs.gpr[13] = svcpu->gpr[13];
 249         vcpu->arch.regs.ccr  = svcpu->cr;
 250         vcpu->arch.regs.xer = svcpu->xer;
 251         vcpu->arch.regs.ctr = svcpu->ctr;
 252         vcpu->arch.regs.link  = svcpu->lr;
 253         vcpu->arch.regs.nip  = svcpu->pc;
 254         vcpu->arch.shadow_srr1 = svcpu->shadow_srr1;
 255         vcpu->arch.fault_dar   = svcpu->fault_dar;
 256         vcpu->arch.fault_dsisr = svcpu->fault_dsisr;
 257         vcpu->arch.last_inst   = svcpu->last_inst;
 258 #ifdef CONFIG_PPC_BOOK3S_64
 259         vcpu->arch.shadow_fscr = svcpu->shadow_fscr;
 260 #endif
 261         /*
 262          * Update purr and spurr using time base on exit.
 263          */
 264         vcpu->arch.purr += get_tb() - vcpu->arch.entry_tb;
 265         vcpu->arch.spurr += get_tb() - vcpu->arch.entry_tb;
 266         to_book3s(vcpu)->vtb += get_vtb() - vcpu->arch.entry_vtb;
 267         if (cpu_has_feature(CPU_FTR_ARCH_207S))
 268                 vcpu->arch.ic += mfspr(SPRN_IC) - vcpu->arch.entry_ic;
 269 
 270 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 271         /*
 272          * Unlike other MSR bits, MSR[TS]bits can be changed at guest without
 273          * notifying host:
 274          *  modified by unprivileged instructions like "tbegin"/"tend"/
 275          * "tresume"/"tsuspend" in PR KVM guest.
 276          *
 277          * It is necessary to sync here to calculate a correct shadow_msr.
 278          *
 279          * privileged guest's tbegin will be failed at present. So we
 280          * only take care of problem state guest.
 281          */
 282         old_msr = kvmppc_get_msr(vcpu);
 283         if (unlikely((old_msr & MSR_PR) &&
 284                 (vcpu->arch.shadow_srr1 & (MSR_TS_MASK)) !=
 285                                 (old_msr & (MSR_TS_MASK)))) {
 286                 old_msr &= ~(MSR_TS_MASK);
 287                 old_msr |= (vcpu->arch.shadow_srr1 & (MSR_TS_MASK));
 288                 kvmppc_set_msr_fast(vcpu, old_msr);
 289                 kvmppc_recalc_shadow_msr(vcpu);
 290         }
 291 #endif
 292 
 293         svcpu->in_use = false;
 294 
 295 out:
 296         svcpu_put(svcpu);
 297 }
 298 
 299 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 300 void kvmppc_save_tm_sprs(struct kvm_vcpu *vcpu)
 301 {
 302         tm_enable();
 303         vcpu->arch.tfhar = mfspr(SPRN_TFHAR);
 304         vcpu->arch.texasr = mfspr(SPRN_TEXASR);
 305         vcpu->arch.tfiar = mfspr(SPRN_TFIAR);
 306         tm_disable();
 307 }
 308 
 309 void kvmppc_restore_tm_sprs(struct kvm_vcpu *vcpu)
 310 {
 311         tm_enable();
 312         mtspr(SPRN_TFHAR, vcpu->arch.tfhar);
 313         mtspr(SPRN_TEXASR, vcpu->arch.texasr);
 314         mtspr(SPRN_TFIAR, vcpu->arch.tfiar);
 315         tm_disable();
 316 }
 317 
 318 /* loadup math bits which is enabled at kvmppc_get_msr() but not enabled at
 319  * hardware.
 320  */
 321 static void kvmppc_handle_lost_math_exts(struct kvm_vcpu *vcpu)
 322 {
 323         ulong exit_nr;
 324         ulong ext_diff = (kvmppc_get_msr(vcpu) & ~vcpu->arch.guest_owned_ext) &
 325                 (MSR_FP | MSR_VEC | MSR_VSX);
 326 
 327         if (!ext_diff)
 328                 return;
 329 
 330         if (ext_diff == MSR_FP)
 331                 exit_nr = BOOK3S_INTERRUPT_FP_UNAVAIL;
 332         else if (ext_diff == MSR_VEC)
 333                 exit_nr = BOOK3S_INTERRUPT_ALTIVEC;
 334         else
 335                 exit_nr = BOOK3S_INTERRUPT_VSX;
 336 
 337         kvmppc_handle_ext(vcpu, exit_nr, ext_diff);
 338 }
 339 
 340 void kvmppc_save_tm_pr(struct kvm_vcpu *vcpu)
 341 {
 342         if (!(MSR_TM_ACTIVE(kvmppc_get_msr(vcpu)))) {
 343                 kvmppc_save_tm_sprs(vcpu);
 344                 return;
 345         }
 346 
 347         kvmppc_giveup_fac(vcpu, FSCR_TAR_LG);
 348         kvmppc_giveup_ext(vcpu, MSR_VSX);
 349 
 350         preempt_disable();
 351         _kvmppc_save_tm_pr(vcpu, mfmsr());
 352         preempt_enable();
 353 }
 354 
 355 void kvmppc_restore_tm_pr(struct kvm_vcpu *vcpu)
 356 {
 357         if (!MSR_TM_ACTIVE(kvmppc_get_msr(vcpu))) {
 358                 kvmppc_restore_tm_sprs(vcpu);
 359                 if (kvmppc_get_msr(vcpu) & MSR_TM) {
 360                         kvmppc_handle_lost_math_exts(vcpu);
 361                         if (vcpu->arch.fscr & FSCR_TAR)
 362                                 kvmppc_handle_fac(vcpu, FSCR_TAR_LG);
 363                 }
 364                 return;
 365         }
 366 
 367         preempt_disable();
 368         _kvmppc_restore_tm_pr(vcpu, kvmppc_get_msr(vcpu));
 369         preempt_enable();
 370 
 371         if (kvmppc_get_msr(vcpu) & MSR_TM) {
 372                 kvmppc_handle_lost_math_exts(vcpu);
 373                 if (vcpu->arch.fscr & FSCR_TAR)
 374                         kvmppc_handle_fac(vcpu, FSCR_TAR_LG);
 375         }
 376 }
 377 #endif
 378 
 379 static int kvmppc_core_check_requests_pr(struct kvm_vcpu *vcpu)
 380 {
 381         int r = 1; /* Indicate we want to get back into the guest */
 382 
 383         /* We misuse TLB_FLUSH to indicate that we want to clear
 384            all shadow cache entries */
 385         if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu))
 386                 kvmppc_mmu_pte_flush(vcpu, 0, 0);
 387 
 388         return r;
 389 }
 390 
 391 /************* MMU Notifiers *************/
 392 static void do_kvm_unmap_hva(struct kvm *kvm, unsigned long start,
 393                              unsigned long end)
 394 {
 395         long i;
 396         struct kvm_vcpu *vcpu;
 397         struct kvm_memslots *slots;
 398         struct kvm_memory_slot *memslot;
 399 
 400         slots = kvm_memslots(kvm);
 401         kvm_for_each_memslot(memslot, slots) {
 402                 unsigned long hva_start, hva_end;
 403                 gfn_t gfn, gfn_end;
 404 
 405                 hva_start = max(start, memslot->userspace_addr);
 406                 hva_end = min(end, memslot->userspace_addr +
 407                                         (memslot->npages << PAGE_SHIFT));
 408                 if (hva_start >= hva_end)
 409                         continue;
 410                 /*
 411                  * {gfn(page) | page intersects with [hva_start, hva_end)} =
 412                  * {gfn, gfn+1, ..., gfn_end-1}.
 413                  */
 414                 gfn = hva_to_gfn_memslot(hva_start, memslot);
 415                 gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot);
 416                 kvm_for_each_vcpu(i, vcpu, kvm)
 417                         kvmppc_mmu_pte_pflush(vcpu, gfn << PAGE_SHIFT,
 418                                               gfn_end << PAGE_SHIFT);
 419         }
 420 }
 421 
 422 static int kvm_unmap_hva_range_pr(struct kvm *kvm, unsigned long start,
 423                                   unsigned long end)
 424 {
 425         do_kvm_unmap_hva(kvm, start, end);
 426 
 427         return 0;
 428 }
 429 
 430 static int kvm_age_hva_pr(struct kvm *kvm, unsigned long start,
 431                           unsigned long end)
 432 {
 433         /* XXX could be more clever ;) */
 434         return 0;
 435 }
 436 
 437 static int kvm_test_age_hva_pr(struct kvm *kvm, unsigned long hva)
 438 {
 439         /* XXX could be more clever ;) */
 440         return 0;
 441 }
 442 
 443 static void kvm_set_spte_hva_pr(struct kvm *kvm, unsigned long hva, pte_t pte)
 444 {
 445         /* The page will get remapped properly on its next fault */
 446         do_kvm_unmap_hva(kvm, hva, hva + PAGE_SIZE);
 447 }
 448 
 449 /*****************************************/
 450 
 451 static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)
 452 {
 453         ulong old_msr;
 454 
 455         /* For PAPR guest, make sure MSR reflects guest mode */
 456         if (vcpu->arch.papr_enabled)
 457                 msr = (msr & ~MSR_HV) | MSR_ME;
 458 
 459 #ifdef EXIT_DEBUG
 460         printk(KERN_INFO "KVM: Set MSR to 0x%llx\n", msr);
 461 #endif
 462 
 463 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 464         /* We should never target guest MSR to TS=10 && PR=0,
 465          * since we always fail transaction for guest privilege
 466          * state.
 467          */
 468         if (!(msr & MSR_PR) && MSR_TM_TRANSACTIONAL(msr))
 469                 kvmppc_emulate_tabort(vcpu,
 470                         TM_CAUSE_KVM_FAC_UNAV | TM_CAUSE_PERSISTENT);
 471 #endif
 472 
 473         old_msr = kvmppc_get_msr(vcpu);
 474         msr &= to_book3s(vcpu)->msr_mask;
 475         kvmppc_set_msr_fast(vcpu, msr);
 476         kvmppc_recalc_shadow_msr(vcpu);
 477 
 478         if (msr & MSR_POW) {
 479                 if (!vcpu->arch.pending_exceptions) {
 480                         kvm_vcpu_block(vcpu);
 481                         kvm_clear_request(KVM_REQ_UNHALT, vcpu);
 482                         vcpu->stat.halt_wakeup++;
 483 
 484                         /* Unset POW bit after we woke up */
 485                         msr &= ~MSR_POW;
 486                         kvmppc_set_msr_fast(vcpu, msr);
 487                 }
 488         }
 489 
 490         if (kvmppc_is_split_real(vcpu))
 491                 kvmppc_fixup_split_real(vcpu);
 492         else
 493                 kvmppc_unfixup_split_real(vcpu);
 494 
 495         if ((kvmppc_get_msr(vcpu) & (MSR_PR|MSR_IR|MSR_DR)) !=
 496                    (old_msr & (MSR_PR|MSR_IR|MSR_DR))) {
 497                 kvmppc_mmu_flush_segments(vcpu);
 498                 kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
 499 
 500                 /* Preload magic page segment when in kernel mode */
 501                 if (!(msr & MSR_PR) && vcpu->arch.magic_page_pa) {
 502                         struct kvm_vcpu_arch *a = &vcpu->arch;
 503 
 504                         if (msr & MSR_DR)
 505                                 kvmppc_mmu_map_segment(vcpu, a->magic_page_ea);
 506                         else
 507                                 kvmppc_mmu_map_segment(vcpu, a->magic_page_pa);
 508                 }
 509         }
 510 
 511         /*
 512          * When switching from 32 to 64-bit, we may have a stale 32-bit
 513          * magic page around, we need to flush it. Typically 32-bit magic
 514          * page will be instantiated when calling into RTAS. Note: We
 515          * assume that such transition only happens while in kernel mode,
 516          * ie, we never transition from user 32-bit to kernel 64-bit with
 517          * a 32-bit magic page around.
 518          */
 519         if (vcpu->arch.magic_page_pa &&
 520             !(old_msr & MSR_PR) && !(old_msr & MSR_SF) && (msr & MSR_SF)) {
 521                 /* going from RTAS to normal kernel code */
 522                 kvmppc_mmu_pte_flush(vcpu, (uint32_t)vcpu->arch.magic_page_pa,
 523                                      ~0xFFFUL);
 524         }
 525 
 526         /* Preload FPU if it's enabled */
 527         if (kvmppc_get_msr(vcpu) & MSR_FP)
 528                 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
 529 
 530 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 531         if (kvmppc_get_msr(vcpu) & MSR_TM)
 532                 kvmppc_handle_lost_math_exts(vcpu);
 533 #endif
 534 }
 535 
 536 void kvmppc_set_pvr_pr(struct kvm_vcpu *vcpu, u32 pvr)
 537 {
 538         u32 host_pvr;
 539 
 540         vcpu->arch.hflags &= ~BOOK3S_HFLAG_SLB;
 541         vcpu->arch.pvr = pvr;
 542 #ifdef CONFIG_PPC_BOOK3S_64
 543         if ((pvr >= 0x330000) && (pvr < 0x70330000)) {
 544                 kvmppc_mmu_book3s_64_init(vcpu);
 545                 if (!to_book3s(vcpu)->hior_explicit)
 546                         to_book3s(vcpu)->hior = 0xfff00000;
 547                 to_book3s(vcpu)->msr_mask = 0xffffffffffffffffULL;
 548                 vcpu->arch.cpu_type = KVM_CPU_3S_64;
 549         } else
 550 #endif
 551         {
 552                 kvmppc_mmu_book3s_32_init(vcpu);
 553                 if (!to_book3s(vcpu)->hior_explicit)
 554                         to_book3s(vcpu)->hior = 0;
 555                 to_book3s(vcpu)->msr_mask = 0xffffffffULL;
 556                 vcpu->arch.cpu_type = KVM_CPU_3S_32;
 557         }
 558 
 559         kvmppc_sanity_check(vcpu);
 560 
 561         /* If we are in hypervisor level on 970, we can tell the CPU to
 562          * treat DCBZ as 32 bytes store */
 563         vcpu->arch.hflags &= ~BOOK3S_HFLAG_DCBZ32;
 564         if (vcpu->arch.mmu.is_dcbz32(vcpu) && (mfmsr() & MSR_HV) &&
 565             !strcmp(cur_cpu_spec->platform, "ppc970"))
 566                 vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
 567 
 568         /* Cell performs badly if MSR_FEx are set. So let's hope nobody
 569            really needs them in a VM on Cell and force disable them. */
 570         if (!strcmp(cur_cpu_spec->platform, "ppc-cell-be"))
 571                 to_book3s(vcpu)->msr_mask &= ~(MSR_FE0 | MSR_FE1);
 572 
 573         /*
 574          * If they're asking for POWER6 or later, set the flag
 575          * indicating that we can do multiple large page sizes
 576          * and 1TB segments.
 577          * Also set the flag that indicates that tlbie has the large
 578          * page bit in the RB operand instead of the instruction.
 579          */
 580         switch (PVR_VER(pvr)) {
 581         case PVR_POWER6:
 582         case PVR_POWER7:
 583         case PVR_POWER7p:
 584         case PVR_POWER8:
 585         case PVR_POWER8E:
 586         case PVR_POWER8NVL:
 587         case PVR_POWER9:
 588                 vcpu->arch.hflags |= BOOK3S_HFLAG_MULTI_PGSIZE |
 589                         BOOK3S_HFLAG_NEW_TLBIE;
 590                 break;
 591         }
 592 
 593 #ifdef CONFIG_PPC_BOOK3S_32
 594         /* 32 bit Book3S always has 32 byte dcbz */
 595         vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
 596 #endif
 597 
 598         /* On some CPUs we can execute paired single operations natively */
 599         asm ( "mfpvr %0" : "=r"(host_pvr));
 600         switch (host_pvr) {
 601         case 0x00080200:        /* lonestar 2.0 */
 602         case 0x00088202:        /* lonestar 2.2 */
 603         case 0x70000100:        /* gekko 1.0 */
 604         case 0x00080100:        /* gekko 2.0 */
 605         case 0x00083203:        /* gekko 2.3a */
 606         case 0x00083213:        /* gekko 2.3b */
 607         case 0x00083204:        /* gekko 2.4 */
 608         case 0x00083214:        /* gekko 2.4e (8SE) - retail HW2 */
 609         case 0x00087200:        /* broadway */
 610                 vcpu->arch.hflags |= BOOK3S_HFLAG_NATIVE_PS;
 611                 /* Enable HID2.PSE - in case we need it later */
 612                 mtspr(SPRN_HID2_GEKKO, mfspr(SPRN_HID2_GEKKO) | (1 << 29));
 613         }
 614 }
 615 
 616 /* Book3s_32 CPUs always have 32 bytes cache line size, which Linux assumes. To
 617  * make Book3s_32 Linux work on Book3s_64, we have to make sure we trap dcbz to
 618  * emulate 32 bytes dcbz length.
 619  *
 620  * The Book3s_64 inventors also realized this case and implemented a special bit
 621  * in the HID5 register, which is a hypervisor ressource. Thus we can't use it.
 622  *
 623  * My approach here is to patch the dcbz instruction on executing pages.
 624  */
 625 static void kvmppc_patch_dcbz(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
 626 {
 627         struct page *hpage;
 628         u64 hpage_offset;
 629         u32 *page;
 630         int i;
 631 
 632         hpage = gfn_to_page(vcpu->kvm, pte->raddr >> PAGE_SHIFT);
 633         if (is_error_page(hpage))
 634                 return;
 635 
 636         hpage_offset = pte->raddr & ~PAGE_MASK;
 637         hpage_offset &= ~0xFFFULL;
 638         hpage_offset /= 4;
 639 
 640         get_page(hpage);
 641         page = kmap_atomic(hpage);
 642 
 643         /* patch dcbz into reserved instruction, so we trap */
 644         for (i=hpage_offset; i < hpage_offset + (HW_PAGE_SIZE / 4); i++)
 645                 if ((be32_to_cpu(page[i]) & 0xff0007ff) == INS_DCBZ)
 646                         page[i] &= cpu_to_be32(0xfffffff7);
 647 
 648         kunmap_atomic(page);
 649         put_page(hpage);
 650 }
 651 
 652 static bool kvmppc_visible_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
 653 {
 654         ulong mp_pa = vcpu->arch.magic_page_pa;
 655 
 656         if (!(kvmppc_get_msr(vcpu) & MSR_SF))
 657                 mp_pa = (uint32_t)mp_pa;
 658 
 659         gpa &= ~0xFFFULL;
 660         if (unlikely(mp_pa) && unlikely((mp_pa & KVM_PAM) == (gpa & KVM_PAM))) {
 661                 return true;
 662         }
 663 
 664         return kvm_is_visible_gfn(vcpu->kvm, gpa >> PAGE_SHIFT);
 665 }
 666 
 667 int kvmppc_handle_pagefault(struct kvm_run *run, struct kvm_vcpu *vcpu,
 668                             ulong eaddr, int vec)
 669 {
 670         bool data = (vec == BOOK3S_INTERRUPT_DATA_STORAGE);
 671         bool iswrite = false;
 672         int r = RESUME_GUEST;
 673         int relocated;
 674         int page_found = 0;
 675         struct kvmppc_pte pte = { 0 };
 676         bool dr = (kvmppc_get_msr(vcpu) & MSR_DR) ? true : false;
 677         bool ir = (kvmppc_get_msr(vcpu) & MSR_IR) ? true : false;
 678         u64 vsid;
 679 
 680         relocated = data ? dr : ir;
 681         if (data && (vcpu->arch.fault_dsisr & DSISR_ISSTORE))
 682                 iswrite = true;
 683 
 684         /* Resolve real address if translation turned on */
 685         if (relocated) {
 686                 page_found = vcpu->arch.mmu.xlate(vcpu, eaddr, &pte, data, iswrite);
 687         } else {
 688                 pte.may_execute = true;
 689                 pte.may_read = true;
 690                 pte.may_write = true;
 691                 pte.raddr = eaddr & KVM_PAM;
 692                 pte.eaddr = eaddr;
 693                 pte.vpage = eaddr >> 12;
 694                 pte.page_size = MMU_PAGE_64K;
 695                 pte.wimg = HPTE_R_M;
 696         }
 697 
 698         switch (kvmppc_get_msr(vcpu) & (MSR_DR|MSR_IR)) {
 699         case 0:
 700                 pte.vpage |= ((u64)VSID_REAL << (SID_SHIFT - 12));
 701                 break;
 702         case MSR_DR:
 703                 if (!data &&
 704                     (vcpu->arch.hflags & BOOK3S_HFLAG_SPLIT_HACK) &&
 705                     ((pte.raddr & SPLIT_HACK_MASK) == SPLIT_HACK_OFFS))
 706                         pte.raddr &= ~SPLIT_HACK_MASK;
 707                 /* fall through */
 708         case MSR_IR:
 709                 vcpu->arch.mmu.esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid);
 710 
 711                 if ((kvmppc_get_msr(vcpu) & (MSR_DR|MSR_IR)) == MSR_DR)
 712                         pte.vpage |= ((u64)VSID_REAL_DR << (SID_SHIFT - 12));
 713                 else
 714                         pte.vpage |= ((u64)VSID_REAL_IR << (SID_SHIFT - 12));
 715                 pte.vpage |= vsid;
 716 
 717                 if (vsid == -1)
 718                         page_found = -EINVAL;
 719                 break;
 720         }
 721 
 722         if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
 723            (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
 724                 /*
 725                  * If we do the dcbz hack, we have to NX on every execution,
 726                  * so we can patch the executing code. This renders our guest
 727                  * NX-less.
 728                  */
 729                 pte.may_execute = !data;
 730         }
 731 
 732         if (page_found == -ENOENT || page_found == -EPERM) {
 733                 /* Page not found in guest PTE entries, or protection fault */
 734                 u64 flags;
 735 
 736                 if (page_found == -EPERM)
 737                         flags = DSISR_PROTFAULT;
 738                 else
 739                         flags = DSISR_NOHPTE;
 740                 if (data) {
 741                         flags |= vcpu->arch.fault_dsisr & DSISR_ISSTORE;
 742                         kvmppc_core_queue_data_storage(vcpu, eaddr, flags);
 743                 } else {
 744                         kvmppc_core_queue_inst_storage(vcpu, flags);
 745                 }
 746         } else if (page_found == -EINVAL) {
 747                 /* Page not found in guest SLB */
 748                 kvmppc_set_dar(vcpu, kvmppc_get_fault_dar(vcpu));
 749                 kvmppc_book3s_queue_irqprio(vcpu, vec + 0x80);
 750         } else if (kvmppc_visible_gpa(vcpu, pte.raddr)) {
 751                 if (data && !(vcpu->arch.fault_dsisr & DSISR_NOHPTE)) {
 752                         /*
 753                          * There is already a host HPTE there, presumably
 754                          * a read-only one for a page the guest thinks
 755                          * is writable, so get rid of it first.
 756                          */
 757                         kvmppc_mmu_unmap_page(vcpu, &pte);
 758                 }
 759                 /* The guest's PTE is not mapped yet. Map on the host */
 760                 if (kvmppc_mmu_map_page(vcpu, &pte, iswrite) == -EIO) {
 761                         /* Exit KVM if mapping failed */
 762                         run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
 763                         return RESUME_HOST;
 764                 }
 765                 if (data)
 766                         vcpu->stat.sp_storage++;
 767                 else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
 768                          (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32)))
 769                         kvmppc_patch_dcbz(vcpu, &pte);
 770         } else {
 771                 /* MMIO */
 772                 vcpu->stat.mmio_exits++;
 773                 vcpu->arch.paddr_accessed = pte.raddr;
 774                 vcpu->arch.vaddr_accessed = pte.eaddr;
 775                 r = kvmppc_emulate_mmio(run, vcpu);
 776                 if ( r == RESUME_HOST_NV )
 777                         r = RESUME_HOST;
 778         }
 779 
 780         return r;
 781 }
 782 
 783 /* Give up external provider (FPU, Altivec, VSX) */
 784 void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr)
 785 {
 786         struct thread_struct *t = &current->thread;
 787 
 788         /*
 789          * VSX instructions can access FP and vector registers, so if
 790          * we are giving up VSX, make sure we give up FP and VMX as well.
 791          */
 792         if (msr & MSR_VSX)
 793                 msr |= MSR_FP | MSR_VEC;
 794 
 795         msr &= vcpu->arch.guest_owned_ext;
 796         if (!msr)
 797                 return;
 798 
 799 #ifdef DEBUG_EXT
 800         printk(KERN_INFO "Giving up ext 0x%lx\n", msr);
 801 #endif
 802 
 803         if (msr & MSR_FP) {
 804                 /*
 805                  * Note that on CPUs with VSX, giveup_fpu stores
 806                  * both the traditional FP registers and the added VSX
 807                  * registers into thread.fp_state.fpr[].
 808                  */
 809                 if (t->regs->msr & MSR_FP)
 810                         giveup_fpu(current);
 811                 t->fp_save_area = NULL;
 812         }
 813 
 814 #ifdef CONFIG_ALTIVEC
 815         if (msr & MSR_VEC) {
 816                 if (current->thread.regs->msr & MSR_VEC)
 817                         giveup_altivec(current);
 818                 t->vr_save_area = NULL;
 819         }
 820 #endif
 821 
 822         vcpu->arch.guest_owned_ext &= ~(msr | MSR_VSX);
 823         kvmppc_recalc_shadow_msr(vcpu);
 824 }
 825 
 826 /* Give up facility (TAR / EBB / DSCR) */
 827 void kvmppc_giveup_fac(struct kvm_vcpu *vcpu, ulong fac)
 828 {
 829 #ifdef CONFIG_PPC_BOOK3S_64
 830         if (!(vcpu->arch.shadow_fscr & (1ULL << fac))) {
 831                 /* Facility not available to the guest, ignore giveup request*/
 832                 return;
 833         }
 834 
 835         switch (fac) {
 836         case FSCR_TAR_LG:
 837                 vcpu->arch.tar = mfspr(SPRN_TAR);
 838                 mtspr(SPRN_TAR, current->thread.tar);
 839                 vcpu->arch.shadow_fscr &= ~FSCR_TAR;
 840                 break;
 841         }
 842 #endif
 843 }
 844 
 845 /* Handle external providers (FPU, Altivec, VSX) */
 846 static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
 847                              ulong msr)
 848 {
 849         struct thread_struct *t = &current->thread;
 850 
 851         /* When we have paired singles, we emulate in software */
 852         if (vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE)
 853                 return RESUME_GUEST;
 854 
 855         if (!(kvmppc_get_msr(vcpu) & msr)) {
 856                 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 857                 return RESUME_GUEST;
 858         }
 859 
 860         if (msr == MSR_VSX) {
 861                 /* No VSX?  Give an illegal instruction interrupt */
 862 #ifdef CONFIG_VSX
 863                 if (!cpu_has_feature(CPU_FTR_VSX))
 864 #endif
 865                 {
 866                         kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
 867                         return RESUME_GUEST;
 868                 }
 869 
 870                 /*
 871                  * We have to load up all the FP and VMX registers before
 872                  * we can let the guest use VSX instructions.
 873                  */
 874                 msr = MSR_FP | MSR_VEC | MSR_VSX;
 875         }
 876 
 877         /* See if we already own all the ext(s) needed */
 878         msr &= ~vcpu->arch.guest_owned_ext;
 879         if (!msr)
 880                 return RESUME_GUEST;
 881 
 882 #ifdef DEBUG_EXT
 883         printk(KERN_INFO "Loading up ext 0x%lx\n", msr);
 884 #endif
 885 
 886         if (msr & MSR_FP) {
 887                 preempt_disable();
 888                 enable_kernel_fp();
 889                 load_fp_state(&vcpu->arch.fp);
 890                 disable_kernel_fp();
 891                 t->fp_save_area = &vcpu->arch.fp;
 892                 preempt_enable();
 893         }
 894 
 895         if (msr & MSR_VEC) {
 896 #ifdef CONFIG_ALTIVEC
 897                 preempt_disable();
 898                 enable_kernel_altivec();
 899                 load_vr_state(&vcpu->arch.vr);
 900                 disable_kernel_altivec();
 901                 t->vr_save_area = &vcpu->arch.vr;
 902                 preempt_enable();
 903 #endif
 904         }
 905 
 906         t->regs->msr |= msr;
 907         vcpu->arch.guest_owned_ext |= msr;
 908         kvmppc_recalc_shadow_msr(vcpu);
 909 
 910         return RESUME_GUEST;
 911 }
 912 
 913 /*
 914  * Kernel code using FP or VMX could have flushed guest state to
 915  * the thread_struct; if so, get it back now.
 916  */
 917 static void kvmppc_handle_lost_ext(struct kvm_vcpu *vcpu)
 918 {
 919         unsigned long lost_ext;
 920 
 921         lost_ext = vcpu->arch.guest_owned_ext & ~current->thread.regs->msr;
 922         if (!lost_ext)
 923                 return;
 924 
 925         if (lost_ext & MSR_FP) {
 926                 preempt_disable();
 927                 enable_kernel_fp();
 928                 load_fp_state(&vcpu->arch.fp);
 929                 disable_kernel_fp();
 930                 preempt_enable();
 931         }
 932 #ifdef CONFIG_ALTIVEC
 933         if (lost_ext & MSR_VEC) {
 934                 preempt_disable();
 935                 enable_kernel_altivec();
 936                 load_vr_state(&vcpu->arch.vr);
 937                 disable_kernel_altivec();
 938                 preempt_enable();
 939         }
 940 #endif
 941         current->thread.regs->msr |= lost_ext;
 942 }
 943 
 944 #ifdef CONFIG_PPC_BOOK3S_64
 945 
 946 void kvmppc_trigger_fac_interrupt(struct kvm_vcpu *vcpu, ulong fac)
 947 {
 948         /* Inject the Interrupt Cause field and trigger a guest interrupt */
 949         vcpu->arch.fscr &= ~(0xffULL << 56);
 950         vcpu->arch.fscr |= (fac << 56);
 951         kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_FAC_UNAVAIL);
 952 }
 953 
 954 static void kvmppc_emulate_fac(struct kvm_vcpu *vcpu, ulong fac)
 955 {
 956         enum emulation_result er = EMULATE_FAIL;
 957 
 958         if (!(kvmppc_get_msr(vcpu) & MSR_PR))
 959                 er = kvmppc_emulate_instruction(vcpu->run, vcpu);
 960 
 961         if ((er != EMULATE_DONE) && (er != EMULATE_AGAIN)) {
 962                 /* Couldn't emulate, trigger interrupt in guest */
 963                 kvmppc_trigger_fac_interrupt(vcpu, fac);
 964         }
 965 }
 966 
 967 /* Enable facilities (TAR, EBB, DSCR) for the guest */
 968 static int kvmppc_handle_fac(struct kvm_vcpu *vcpu, ulong fac)
 969 {
 970         bool guest_fac_enabled;
 971         BUG_ON(!cpu_has_feature(CPU_FTR_ARCH_207S));
 972 
 973         /*
 974          * Not every facility is enabled by FSCR bits, check whether the
 975          * guest has this facility enabled at all.
 976          */
 977         switch (fac) {
 978         case FSCR_TAR_LG:
 979         case FSCR_EBB_LG:
 980                 guest_fac_enabled = (vcpu->arch.fscr & (1ULL << fac));
 981                 break;
 982         case FSCR_TM_LG:
 983                 guest_fac_enabled = kvmppc_get_msr(vcpu) & MSR_TM;
 984                 break;
 985         default:
 986                 guest_fac_enabled = false;
 987                 break;
 988         }
 989 
 990         if (!guest_fac_enabled) {
 991                 /* Facility not enabled by the guest */
 992                 kvmppc_trigger_fac_interrupt(vcpu, fac);
 993                 return RESUME_GUEST;
 994         }
 995 
 996         switch (fac) {
 997         case FSCR_TAR_LG:
 998                 /* TAR switching isn't lazy in Linux yet */
 999                 current->thread.tar = mfspr(SPRN_TAR);
1000                 mtspr(SPRN_TAR, vcpu->arch.tar);
1001                 vcpu->arch.shadow_fscr |= FSCR_TAR;
1002                 break;
1003         default:
1004                 kvmppc_emulate_fac(vcpu, fac);
1005                 break;
1006         }
1007 
1008 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1009         /* Since we disabled MSR_TM at privilege state, the mfspr instruction
1010          * for TM spr can trigger TM fac unavailable. In this case, the
1011          * emulation is handled by kvmppc_emulate_fac(), which invokes
1012          * kvmppc_emulate_mfspr() finally. But note the mfspr can include
1013          * RT for NV registers. So it need to restore those NV reg to reflect
1014          * the update.
1015          */
1016         if ((fac == FSCR_TM_LG) && !(kvmppc_get_msr(vcpu) & MSR_PR))
1017                 return RESUME_GUEST_NV;
1018 #endif
1019 
1020         return RESUME_GUEST;
1021 }
1022 
1023 void kvmppc_set_fscr(struct kvm_vcpu *vcpu, u64 fscr)
1024 {
1025         if ((vcpu->arch.fscr & FSCR_TAR) && !(fscr & FSCR_TAR)) {
1026                 /* TAR got dropped, drop it in shadow too */
1027                 kvmppc_giveup_fac(vcpu, FSCR_TAR_LG);
1028         } else if (!(vcpu->arch.fscr & FSCR_TAR) && (fscr & FSCR_TAR)) {
1029                 vcpu->arch.fscr = fscr;
1030                 kvmppc_handle_fac(vcpu, FSCR_TAR_LG);
1031                 return;
1032         }
1033 
1034         vcpu->arch.fscr = fscr;
1035 }
1036 #endif
1037 
1038 static void kvmppc_setup_debug(struct kvm_vcpu *vcpu)
1039 {
1040         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {
1041                 u64 msr = kvmppc_get_msr(vcpu);
1042 
1043                 kvmppc_set_msr(vcpu, msr | MSR_SE);
1044         }
1045 }
1046 
1047 static void kvmppc_clear_debug(struct kvm_vcpu *vcpu)
1048 {
1049         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {
1050                 u64 msr = kvmppc_get_msr(vcpu);
1051 
1052                 kvmppc_set_msr(vcpu, msr & ~MSR_SE);
1053         }
1054 }
1055 
1056 static int kvmppc_exit_pr_progint(struct kvm_run *run, struct kvm_vcpu *vcpu,
1057                                   unsigned int exit_nr)
1058 {
1059         enum emulation_result er;
1060         ulong flags;
1061         u32 last_inst;
1062         int emul, r;
1063 
1064         /*
1065          * shadow_srr1 only contains valid flags if we came here via a program
1066          * exception. The other exceptions (emulation assist, FP unavailable,
1067          * etc.) do not provide flags in SRR1, so use an illegal-instruction
1068          * exception when injecting a program interrupt into the guest.
1069          */
1070         if (exit_nr == BOOK3S_INTERRUPT_PROGRAM)
1071                 flags = vcpu->arch.shadow_srr1 & 0x1f0000ull;
1072         else
1073                 flags = SRR1_PROGILL;
1074 
1075         emul = kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst);
1076         if (emul != EMULATE_DONE)
1077                 return RESUME_GUEST;
1078 
1079         if (kvmppc_get_msr(vcpu) & MSR_PR) {
1080 #ifdef EXIT_DEBUG
1081                 pr_info("Userspace triggered 0x700 exception at\n 0x%lx (0x%x)\n",
1082                         kvmppc_get_pc(vcpu), last_inst);
1083 #endif
1084                 if ((last_inst & 0xff0007ff) != (INS_DCBZ & 0xfffffff7)) {
1085                         kvmppc_core_queue_program(vcpu, flags);
1086                         return RESUME_GUEST;
1087                 }
1088         }
1089 
1090         vcpu->stat.emulated_inst_exits++;
1091         er = kvmppc_emulate_instruction(run, vcpu);
1092         switch (er) {
1093         case EMULATE_DONE:
1094                 r = RESUME_GUEST_NV;
1095                 break;
1096         case EMULATE_AGAIN:
1097                 r = RESUME_GUEST;
1098                 break;
1099         case EMULATE_FAIL:
1100                 pr_crit("%s: emulation at %lx failed (%08x)\n",
1101                         __func__, kvmppc_get_pc(vcpu), last_inst);
1102                 kvmppc_core_queue_program(vcpu, flags);
1103                 r = RESUME_GUEST;
1104                 break;
1105         case EMULATE_DO_MMIO:
1106                 run->exit_reason = KVM_EXIT_MMIO;
1107                 r = RESUME_HOST_NV;
1108                 break;
1109         case EMULATE_EXIT_USER:
1110                 r = RESUME_HOST_NV;
1111                 break;
1112         default:
1113                 BUG();
1114         }
1115 
1116         return r;
1117 }
1118 
1119 int kvmppc_handle_exit_pr(struct kvm_run *run, struct kvm_vcpu *vcpu,
1120                           unsigned int exit_nr)
1121 {
1122         int r = RESUME_HOST;
1123         int s;
1124 
1125         vcpu->stat.sum_exits++;
1126 
1127         run->exit_reason = KVM_EXIT_UNKNOWN;
1128         run->ready_for_interrupt_injection = 1;
1129 
1130         /* We get here with MSR.EE=1 */
1131 
1132         trace_kvm_exit(exit_nr, vcpu);
1133         guest_exit();
1134 
1135         switch (exit_nr) {
1136         case BOOK3S_INTERRUPT_INST_STORAGE:
1137         {
1138                 ulong shadow_srr1 = vcpu->arch.shadow_srr1;
1139                 vcpu->stat.pf_instruc++;
1140 
1141                 if (kvmppc_is_split_real(vcpu))
1142                         kvmppc_fixup_split_real(vcpu);
1143 
1144 #ifdef CONFIG_PPC_BOOK3S_32
1145                 /* We set segments as unused segments when invalidating them. So
1146                  * treat the respective fault as segment fault. */
1147                 {
1148                         struct kvmppc_book3s_shadow_vcpu *svcpu;
1149                         u32 sr;
1150 
1151                         svcpu = svcpu_get(vcpu);
1152                         sr = svcpu->sr[kvmppc_get_pc(vcpu) >> SID_SHIFT];
1153                         svcpu_put(svcpu);
1154                         if (sr == SR_INVALID) {
1155                                 kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
1156                                 r = RESUME_GUEST;
1157                                 break;
1158                         }
1159                 }
1160 #endif
1161 
1162                 /* only care about PTEG not found errors, but leave NX alone */
1163                 if (shadow_srr1 & 0x40000000) {
1164                         int idx = srcu_read_lock(&vcpu->kvm->srcu);
1165                         r = kvmppc_handle_pagefault(run, vcpu, kvmppc_get_pc(vcpu), exit_nr);
1166                         srcu_read_unlock(&vcpu->kvm->srcu, idx);
1167                         vcpu->stat.sp_instruc++;
1168                 } else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
1169                           (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
1170                         /*
1171                          * XXX If we do the dcbz hack we use the NX bit to flush&patch the page,
1172                          *     so we can't use the NX bit inside the guest. Let's cross our fingers,
1173                          *     that no guest that needs the dcbz hack does NX.
1174                          */
1175                         kvmppc_mmu_pte_flush(vcpu, kvmppc_get_pc(vcpu), ~0xFFFUL);
1176                         r = RESUME_GUEST;
1177                 } else {
1178                         kvmppc_core_queue_inst_storage(vcpu,
1179                                                 shadow_srr1 & 0x58000000);
1180                         r = RESUME_GUEST;
1181                 }
1182                 break;
1183         }
1184         case BOOK3S_INTERRUPT_DATA_STORAGE:
1185         {
1186                 ulong dar = kvmppc_get_fault_dar(vcpu);
1187                 u32 fault_dsisr = vcpu->arch.fault_dsisr;
1188                 vcpu->stat.pf_storage++;
1189 
1190 #ifdef CONFIG_PPC_BOOK3S_32
1191                 /* We set segments as unused segments when invalidating them. So
1192                  * treat the respective fault as segment fault. */
1193                 {
1194                         struct kvmppc_book3s_shadow_vcpu *svcpu;
1195                         u32 sr;
1196 
1197                         svcpu = svcpu_get(vcpu);
1198                         sr = svcpu->sr[dar >> SID_SHIFT];
1199                         svcpu_put(svcpu);
1200                         if (sr == SR_INVALID) {
1201                                 kvmppc_mmu_map_segment(vcpu, dar);
1202                                 r = RESUME_GUEST;
1203                                 break;
1204                         }
1205                 }
1206 #endif
1207 
1208                 /*
1209                  * We need to handle missing shadow PTEs, and
1210                  * protection faults due to us mapping a page read-only
1211                  * when the guest thinks it is writable.
1212                  */
1213                 if (fault_dsisr & (DSISR_NOHPTE | DSISR_PROTFAULT)) {
1214                         int idx = srcu_read_lock(&vcpu->kvm->srcu);
1215                         r = kvmppc_handle_pagefault(run, vcpu, dar, exit_nr);
1216                         srcu_read_unlock(&vcpu->kvm->srcu, idx);
1217                 } else {
1218                         kvmppc_core_queue_data_storage(vcpu, dar, fault_dsisr);
1219                         r = RESUME_GUEST;
1220                 }
1221                 break;
1222         }
1223         case BOOK3S_INTERRUPT_DATA_SEGMENT:
1224                 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_fault_dar(vcpu)) < 0) {
1225                         kvmppc_set_dar(vcpu, kvmppc_get_fault_dar(vcpu));
1226                         kvmppc_book3s_queue_irqprio(vcpu,
1227                                 BOOK3S_INTERRUPT_DATA_SEGMENT);
1228                 }
1229                 r = RESUME_GUEST;
1230                 break;
1231         case BOOK3S_INTERRUPT_INST_SEGMENT:
1232                 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu)) < 0) {
1233                         kvmppc_book3s_queue_irqprio(vcpu,
1234                                 BOOK3S_INTERRUPT_INST_SEGMENT);
1235                 }
1236                 r = RESUME_GUEST;
1237                 break;
1238         /* We're good on these - the host merely wanted to get our attention */
1239         case BOOK3S_INTERRUPT_DECREMENTER:
1240         case BOOK3S_INTERRUPT_HV_DECREMENTER:
1241         case BOOK3S_INTERRUPT_DOORBELL:
1242         case BOOK3S_INTERRUPT_H_DOORBELL:
1243                 vcpu->stat.dec_exits++;
1244                 r = RESUME_GUEST;
1245                 break;
1246         case BOOK3S_INTERRUPT_EXTERNAL:
1247         case BOOK3S_INTERRUPT_EXTERNAL_HV:
1248         case BOOK3S_INTERRUPT_H_VIRT:
1249                 vcpu->stat.ext_intr_exits++;
1250                 r = RESUME_GUEST;
1251                 break;
1252         case BOOK3S_INTERRUPT_HMI:
1253         case BOOK3S_INTERRUPT_PERFMON:
1254         case BOOK3S_INTERRUPT_SYSTEM_RESET:
1255                 r = RESUME_GUEST;
1256                 break;
1257         case BOOK3S_INTERRUPT_PROGRAM:
1258         case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
1259                 r = kvmppc_exit_pr_progint(run, vcpu, exit_nr);
1260                 break;
1261         case BOOK3S_INTERRUPT_SYSCALL:
1262         {
1263                 u32 last_sc;
1264                 int emul;
1265 
1266                 /* Get last sc for papr */
1267                 if (vcpu->arch.papr_enabled) {
1268                         /* The sc instuction points SRR0 to the next inst */
1269                         emul = kvmppc_get_last_inst(vcpu, INST_SC, &last_sc);
1270                         if (emul != EMULATE_DONE) {
1271                                 kvmppc_set_pc(vcpu, kvmppc_get_pc(vcpu) - 4);
1272                                 r = RESUME_GUEST;
1273                                 break;
1274                         }
1275                 }
1276 
1277                 if (vcpu->arch.papr_enabled &&
1278                     (last_sc == 0x44000022) &&
1279                     !(kvmppc_get_msr(vcpu) & MSR_PR)) {
1280                         /* SC 1 papr hypercalls */
1281                         ulong cmd = kvmppc_get_gpr(vcpu, 3);
1282                         int i;
1283 
1284 #ifdef CONFIG_PPC_BOOK3S_64
1285                         if (kvmppc_h_pr(vcpu, cmd) == EMULATE_DONE) {
1286                                 r = RESUME_GUEST;
1287                                 break;
1288                         }
1289 #endif
1290 
1291                         run->papr_hcall.nr = cmd;
1292                         for (i = 0; i < 9; ++i) {
1293                                 ulong gpr = kvmppc_get_gpr(vcpu, 4 + i);
1294                                 run->papr_hcall.args[i] = gpr;
1295                         }
1296                         run->exit_reason = KVM_EXIT_PAPR_HCALL;
1297                         vcpu->arch.hcall_needed = 1;
1298                         r = RESUME_HOST;
1299                 } else if (vcpu->arch.osi_enabled &&
1300                     (((u32)kvmppc_get_gpr(vcpu, 3)) == OSI_SC_MAGIC_R3) &&
1301                     (((u32)kvmppc_get_gpr(vcpu, 4)) == OSI_SC_MAGIC_R4)) {
1302                         /* MOL hypercalls */
1303                         u64 *gprs = run->osi.gprs;
1304                         int i;
1305 
1306                         run->exit_reason = KVM_EXIT_OSI;
1307                         for (i = 0; i < 32; i++)
1308                                 gprs[i] = kvmppc_get_gpr(vcpu, i);
1309                         vcpu->arch.osi_needed = 1;
1310                         r = RESUME_HOST_NV;
1311                 } else if (!(kvmppc_get_msr(vcpu) & MSR_PR) &&
1312                     (((u32)kvmppc_get_gpr(vcpu, 0)) == KVM_SC_MAGIC_R0)) {
1313                         /* KVM PV hypercalls */
1314                         kvmppc_set_gpr(vcpu, 3, kvmppc_kvm_pv(vcpu));
1315                         r = RESUME_GUEST;
1316                 } else {
1317                         /* Guest syscalls */
1318                         vcpu->stat.syscall_exits++;
1319                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
1320                         r = RESUME_GUEST;
1321                 }
1322                 break;
1323         }
1324         case BOOK3S_INTERRUPT_FP_UNAVAIL:
1325         case BOOK3S_INTERRUPT_ALTIVEC:
1326         case BOOK3S_INTERRUPT_VSX:
1327         {
1328                 int ext_msr = 0;
1329                 int emul;
1330                 u32 last_inst;
1331 
1332                 if (vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE) {
1333                         /* Do paired single instruction emulation */
1334                         emul = kvmppc_get_last_inst(vcpu, INST_GENERIC,
1335                                                     &last_inst);
1336                         if (emul == EMULATE_DONE)
1337                                 r = kvmppc_exit_pr_progint(run, vcpu, exit_nr);
1338                         else
1339                                 r = RESUME_GUEST;
1340 
1341                         break;
1342                 }
1343 
1344                 /* Enable external provider */
1345                 switch (exit_nr) {
1346                 case BOOK3S_INTERRUPT_FP_UNAVAIL:
1347                         ext_msr = MSR_FP;
1348                         break;
1349 
1350                 case BOOK3S_INTERRUPT_ALTIVEC:
1351                         ext_msr = MSR_VEC;
1352                         break;
1353 
1354                 case BOOK3S_INTERRUPT_VSX:
1355                         ext_msr = MSR_VSX;
1356                         break;
1357                 }
1358 
1359                 r = kvmppc_handle_ext(vcpu, exit_nr, ext_msr);
1360                 break;
1361         }
1362         case BOOK3S_INTERRUPT_ALIGNMENT:
1363         {
1364                 u32 last_inst;
1365                 int emul = kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst);
1366 
1367                 if (emul == EMULATE_DONE) {
1368                         u32 dsisr;
1369                         u64 dar;
1370 
1371                         dsisr = kvmppc_alignment_dsisr(vcpu, last_inst);
1372                         dar = kvmppc_alignment_dar(vcpu, last_inst);
1373 
1374                         kvmppc_set_dsisr(vcpu, dsisr);
1375                         kvmppc_set_dar(vcpu, dar);
1376 
1377                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
1378                 }
1379                 r = RESUME_GUEST;
1380                 break;
1381         }
1382 #ifdef CONFIG_PPC_BOOK3S_64
1383         case BOOK3S_INTERRUPT_FAC_UNAVAIL:
1384                 r = kvmppc_handle_fac(vcpu, vcpu->arch.shadow_fscr >> 56);
1385                 break;
1386 #endif
1387         case BOOK3S_INTERRUPT_MACHINE_CHECK:
1388                 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
1389                 r = RESUME_GUEST;
1390                 break;
1391         case BOOK3S_INTERRUPT_TRACE:
1392                 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {
1393                         run->exit_reason = KVM_EXIT_DEBUG;
1394                         r = RESUME_HOST;
1395                 } else {
1396                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
1397                         r = RESUME_GUEST;
1398                 }
1399                 break;
1400         default:
1401         {
1402                 ulong shadow_srr1 = vcpu->arch.shadow_srr1;
1403                 /* Ugh - bork here! What did we get? */
1404                 printk(KERN_EMERG "exit_nr=0x%x | pc=0x%lx | msr=0x%lx\n",
1405                         exit_nr, kvmppc_get_pc(vcpu), shadow_srr1);
1406                 r = RESUME_HOST;
1407                 BUG();
1408                 break;
1409         }
1410         }
1411 
1412         if (!(r & RESUME_HOST)) {
1413                 /* To avoid clobbering exit_reason, only check for signals if
1414                  * we aren't already exiting to userspace for some other
1415                  * reason. */
1416 
1417                 /*
1418                  * Interrupts could be timers for the guest which we have to
1419                  * inject again, so let's postpone them until we're in the guest
1420                  * and if we really did time things so badly, then we just exit
1421                  * again due to a host external interrupt.
1422                  */
1423                 s = kvmppc_prepare_to_enter(vcpu);
1424                 if (s <= 0)
1425                         r = s;
1426                 else {
1427                         /* interrupts now hard-disabled */
1428                         kvmppc_fix_ee_before_entry();
1429                 }
1430 
1431                 kvmppc_handle_lost_ext(vcpu);
1432         }
1433 
1434         trace_kvm_book3s_reenter(r, vcpu);
1435 
1436         return r;
1437 }
1438 
1439 static int kvm_arch_vcpu_ioctl_get_sregs_pr(struct kvm_vcpu *vcpu,
1440                                             struct kvm_sregs *sregs)
1441 {
1442         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
1443         int i;
1444 
1445         sregs->pvr = vcpu->arch.pvr;
1446 
1447         sregs->u.s.sdr1 = to_book3s(vcpu)->sdr1;
1448         if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) {
1449                 for (i = 0; i < 64; i++) {
1450                         sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige | i;
1451                         sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
1452                 }
1453         } else {
1454                 for (i = 0; i < 16; i++)
1455                         sregs->u.s.ppc32.sr[i] = kvmppc_get_sr(vcpu, i);
1456 
1457                 for (i = 0; i < 8; i++) {
1458                         sregs->u.s.ppc32.ibat[i] = vcpu3s->ibat[i].raw;
1459                         sregs->u.s.ppc32.dbat[i] = vcpu3s->dbat[i].raw;
1460                 }
1461         }
1462 
1463         return 0;
1464 }
1465 
1466 static int kvm_arch_vcpu_ioctl_set_sregs_pr(struct kvm_vcpu *vcpu,
1467                                             struct kvm_sregs *sregs)
1468 {
1469         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
1470         int i;
1471 
1472         kvmppc_set_pvr_pr(vcpu, sregs->pvr);
1473 
1474         vcpu3s->sdr1 = sregs->u.s.sdr1;
1475 #ifdef CONFIG_PPC_BOOK3S_64
1476         if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) {
1477                 /* Flush all SLB entries */
1478                 vcpu->arch.mmu.slbmte(vcpu, 0, 0);
1479                 vcpu->arch.mmu.slbia(vcpu);
1480 
1481                 for (i = 0; i < 64; i++) {
1482                         u64 rb = sregs->u.s.ppc64.slb[i].slbe;
1483                         u64 rs = sregs->u.s.ppc64.slb[i].slbv;
1484 
1485                         if (rb & SLB_ESID_V)
1486                                 vcpu->arch.mmu.slbmte(vcpu, rs, rb);
1487                 }
1488         } else
1489 #endif
1490         {
1491                 for (i = 0; i < 16; i++) {
1492                         vcpu->arch.mmu.mtsrin(vcpu, i, sregs->u.s.ppc32.sr[i]);
1493                 }
1494                 for (i = 0; i < 8; i++) {
1495                         kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), false,
1496                                        (u32)sregs->u.s.ppc32.ibat[i]);
1497                         kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), true,
1498                                        (u32)(sregs->u.s.ppc32.ibat[i] >> 32));
1499                         kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), false,
1500                                        (u32)sregs->u.s.ppc32.dbat[i]);
1501                         kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), true,
1502                                        (u32)(sregs->u.s.ppc32.dbat[i] >> 32));
1503                 }
1504         }
1505 
1506         /* Flush the MMU after messing with the segments */
1507         kvmppc_mmu_pte_flush(vcpu, 0, 0);
1508 
1509         return 0;
1510 }
1511 
1512 static int kvmppc_get_one_reg_pr(struct kvm_vcpu *vcpu, u64 id,
1513                                  union kvmppc_one_reg *val)
1514 {
1515         int r = 0;
1516 
1517         switch (id) {
1518         case KVM_REG_PPC_DEBUG_INST:
1519                 *val = get_reg_val(id, KVMPPC_INST_SW_BREAKPOINT);
1520                 break;
1521         case KVM_REG_PPC_HIOR:
1522                 *val = get_reg_val(id, to_book3s(vcpu)->hior);
1523                 break;
1524         case KVM_REG_PPC_VTB:
1525                 *val = get_reg_val(id, to_book3s(vcpu)->vtb);
1526                 break;
1527         case KVM_REG_PPC_LPCR:
1528         case KVM_REG_PPC_LPCR_64:
1529                 /*
1530                  * We are only interested in the LPCR_ILE bit
1531                  */
1532                 if (vcpu->arch.intr_msr & MSR_LE)
1533                         *val = get_reg_val(id, LPCR_ILE);
1534                 else
1535                         *val = get_reg_val(id, 0);
1536                 break;
1537 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1538         case KVM_REG_PPC_TFHAR:
1539                 *val = get_reg_val(id, vcpu->arch.tfhar);
1540                 break;
1541         case KVM_REG_PPC_TFIAR:
1542                 *val = get_reg_val(id, vcpu->arch.tfiar);
1543                 break;
1544         case KVM_REG_PPC_TEXASR:
1545                 *val = get_reg_val(id, vcpu->arch.texasr);
1546                 break;
1547         case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31:
1548                 *val = get_reg_val(id,
1549                                 vcpu->arch.gpr_tm[id-KVM_REG_PPC_TM_GPR0]);
1550                 break;
1551         case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63:
1552         {
1553                 int i, j;
1554 
1555                 i = id - KVM_REG_PPC_TM_VSR0;
1556                 if (i < 32)
1557                         for (j = 0; j < TS_FPRWIDTH; j++)
1558                                 val->vsxval[j] = vcpu->arch.fp_tm.fpr[i][j];
1559                 else {
1560                         if (cpu_has_feature(CPU_FTR_ALTIVEC))
1561                                 val->vval = vcpu->arch.vr_tm.vr[i-32];
1562                         else
1563                                 r = -ENXIO;
1564                 }
1565                 break;
1566         }
1567         case KVM_REG_PPC_TM_CR:
1568                 *val = get_reg_val(id, vcpu->arch.cr_tm);
1569                 break;
1570         case KVM_REG_PPC_TM_XER:
1571                 *val = get_reg_val(id, vcpu->arch.xer_tm);
1572                 break;
1573         case KVM_REG_PPC_TM_LR:
1574                 *val = get_reg_val(id, vcpu->arch.lr_tm);
1575                 break;
1576         case KVM_REG_PPC_TM_CTR:
1577                 *val = get_reg_val(id, vcpu->arch.ctr_tm);
1578                 break;
1579         case KVM_REG_PPC_TM_FPSCR:
1580                 *val = get_reg_val(id, vcpu->arch.fp_tm.fpscr);
1581                 break;
1582         case KVM_REG_PPC_TM_AMR:
1583                 *val = get_reg_val(id, vcpu->arch.amr_tm);
1584                 break;
1585         case KVM_REG_PPC_TM_PPR:
1586                 *val = get_reg_val(id, vcpu->arch.ppr_tm);
1587                 break;
1588         case KVM_REG_PPC_TM_VRSAVE:
1589                 *val = get_reg_val(id, vcpu->arch.vrsave_tm);
1590                 break;
1591         case KVM_REG_PPC_TM_VSCR:
1592                 if (cpu_has_feature(CPU_FTR_ALTIVEC))
1593                         *val = get_reg_val(id, vcpu->arch.vr_tm.vscr.u[3]);
1594                 else
1595                         r = -ENXIO;
1596                 break;
1597         case KVM_REG_PPC_TM_DSCR:
1598                 *val = get_reg_val(id, vcpu->arch.dscr_tm);
1599                 break;
1600         case KVM_REG_PPC_TM_TAR:
1601                 *val = get_reg_val(id, vcpu->arch.tar_tm);
1602                 break;
1603 #endif
1604         default:
1605                 r = -EINVAL;
1606                 break;
1607         }
1608 
1609         return r;
1610 }
1611 
1612 static void kvmppc_set_lpcr_pr(struct kvm_vcpu *vcpu, u64 new_lpcr)
1613 {
1614         if (new_lpcr & LPCR_ILE)
1615                 vcpu->arch.intr_msr |= MSR_LE;
1616         else
1617                 vcpu->arch.intr_msr &= ~MSR_LE;
1618 }
1619 
1620 static int kvmppc_set_one_reg_pr(struct kvm_vcpu *vcpu, u64 id,
1621                                  union kvmppc_one_reg *val)
1622 {
1623         int r = 0;
1624 
1625         switch (id) {
1626         case KVM_REG_PPC_HIOR:
1627                 to_book3s(vcpu)->hior = set_reg_val(id, *val);
1628                 to_book3s(vcpu)->hior_explicit = true;
1629                 break;
1630         case KVM_REG_PPC_VTB:
1631                 to_book3s(vcpu)->vtb = set_reg_val(id, *val);
1632                 break;
1633         case KVM_REG_PPC_LPCR:
1634         case KVM_REG_PPC_LPCR_64:
1635                 kvmppc_set_lpcr_pr(vcpu, set_reg_val(id, *val));
1636                 break;
1637 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1638         case KVM_REG_PPC_TFHAR:
1639                 vcpu->arch.tfhar = set_reg_val(id, *val);
1640                 break;
1641         case KVM_REG_PPC_TFIAR:
1642                 vcpu->arch.tfiar = set_reg_val(id, *val);
1643                 break;
1644         case KVM_REG_PPC_TEXASR:
1645                 vcpu->arch.texasr = set_reg_val(id, *val);
1646                 break;
1647         case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31:
1648                 vcpu->arch.gpr_tm[id - KVM_REG_PPC_TM_GPR0] =
1649                         set_reg_val(id, *val);
1650                 break;
1651         case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63:
1652         {
1653                 int i, j;
1654 
1655                 i = id - KVM_REG_PPC_TM_VSR0;
1656                 if (i < 32)
1657                         for (j = 0; j < TS_FPRWIDTH; j++)
1658                                 vcpu->arch.fp_tm.fpr[i][j] = val->vsxval[j];
1659                 else
1660                         if (cpu_has_feature(CPU_FTR_ALTIVEC))
1661                                 vcpu->arch.vr_tm.vr[i-32] = val->vval;
1662                         else
1663                                 r = -ENXIO;
1664                 break;
1665         }
1666         case KVM_REG_PPC_TM_CR:
1667                 vcpu->arch.cr_tm = set_reg_val(id, *val);
1668                 break;
1669         case KVM_REG_PPC_TM_XER:
1670                 vcpu->arch.xer_tm = set_reg_val(id, *val);
1671                 break;
1672         case KVM_REG_PPC_TM_LR:
1673                 vcpu->arch.lr_tm = set_reg_val(id, *val);
1674                 break;
1675         case KVM_REG_PPC_TM_CTR:
1676                 vcpu->arch.ctr_tm = set_reg_val(id, *val);
1677                 break;
1678         case KVM_REG_PPC_TM_FPSCR:
1679                 vcpu->arch.fp_tm.fpscr = set_reg_val(id, *val);
1680                 break;
1681         case KVM_REG_PPC_TM_AMR:
1682                 vcpu->arch.amr_tm = set_reg_val(id, *val);
1683                 break;
1684         case KVM_REG_PPC_TM_PPR:
1685                 vcpu->arch.ppr_tm = set_reg_val(id, *val);
1686                 break;
1687         case KVM_REG_PPC_TM_VRSAVE:
1688                 vcpu->arch.vrsave_tm = set_reg_val(id, *val);
1689                 break;
1690         case KVM_REG_PPC_TM_VSCR:
1691                 if (cpu_has_feature(CPU_FTR_ALTIVEC))
1692                         vcpu->arch.vr.vscr.u[3] = set_reg_val(id, *val);
1693                 else
1694                         r = -ENXIO;
1695                 break;
1696         case KVM_REG_PPC_TM_DSCR:
1697                 vcpu->arch.dscr_tm = set_reg_val(id, *val);
1698                 break;
1699         case KVM_REG_PPC_TM_TAR:
1700                 vcpu->arch.tar_tm = set_reg_val(id, *val);
1701                 break;
1702 #endif
1703         default:
1704                 r = -EINVAL;
1705                 break;
1706         }
1707 
1708         return r;
1709 }
1710 
1711 static struct kvm_vcpu *kvmppc_core_vcpu_create_pr(struct kvm *kvm,
1712                                                    unsigned int id)
1713 {
1714         struct kvmppc_vcpu_book3s *vcpu_book3s;
1715         struct kvm_vcpu *vcpu;
1716         int err = -ENOMEM;
1717         unsigned long p;
1718 
1719         vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
1720         if (!vcpu)
1721                 goto out;
1722 
1723         vcpu_book3s = vzalloc(sizeof(struct kvmppc_vcpu_book3s));
1724         if (!vcpu_book3s)
1725                 goto free_vcpu;
1726         vcpu->arch.book3s = vcpu_book3s;
1727 
1728 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER
1729         vcpu->arch.shadow_vcpu =
1730                 kzalloc(sizeof(*vcpu->arch.shadow_vcpu), GFP_KERNEL);
1731         if (!vcpu->arch.shadow_vcpu)
1732                 goto free_vcpu3s;
1733 #endif
1734 
1735         err = kvm_vcpu_init(vcpu, kvm, id);
1736         if (err)
1737                 goto free_shadow_vcpu;
1738 
1739         err = -ENOMEM;
1740         p = __get_free_page(GFP_KERNEL|__GFP_ZERO);
1741         if (!p)
1742                 goto uninit_vcpu;
1743         vcpu->arch.shared = (void *)p;
1744 #ifdef CONFIG_PPC_BOOK3S_64
1745         /* Always start the shared struct in native endian mode */
1746 #ifdef __BIG_ENDIAN__
1747         vcpu->arch.shared_big_endian = true;
1748 #else
1749         vcpu->arch.shared_big_endian = false;
1750 #endif
1751 
1752         /*
1753          * Default to the same as the host if we're on sufficiently
1754          * recent machine that we have 1TB segments;
1755          * otherwise default to PPC970FX.
1756          */
1757         vcpu->arch.pvr = 0x3C0301;
1758         if (mmu_has_feature(MMU_FTR_1T_SEGMENT))
1759                 vcpu->arch.pvr = mfspr(SPRN_PVR);
1760         vcpu->arch.intr_msr = MSR_SF;
1761 #else
1762         /* default to book3s_32 (750) */
1763         vcpu->arch.pvr = 0x84202;
1764 #endif
1765         kvmppc_set_pvr_pr(vcpu, vcpu->arch.pvr);
1766         vcpu->arch.slb_nr = 64;
1767 
1768         vcpu->arch.shadow_msr = MSR_USER64 & ~MSR_LE;
1769 
1770         err = kvmppc_mmu_init(vcpu);
1771         if (err < 0)
1772                 goto free_shared_page;
1773 
1774         return vcpu;
1775 
1776 free_shared_page:
1777         free_page((unsigned long)vcpu->arch.shared);
1778 uninit_vcpu:
1779         kvm_vcpu_uninit(vcpu);
1780 free_shadow_vcpu:
1781 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER
1782         kfree(vcpu->arch.shadow_vcpu);
1783 free_vcpu3s:
1784 #endif
1785         vfree(vcpu_book3s);
1786 free_vcpu:
1787         kmem_cache_free(kvm_vcpu_cache, vcpu);
1788 out:
1789         return ERR_PTR(err);
1790 }
1791 
1792 static void kvmppc_core_vcpu_free_pr(struct kvm_vcpu *vcpu)
1793 {
1794         struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
1795 
1796         free_page((unsigned long)vcpu->arch.shared & PAGE_MASK);
1797         kvm_vcpu_uninit(vcpu);
1798 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER
1799         kfree(vcpu->arch.shadow_vcpu);
1800 #endif
1801         vfree(vcpu_book3s);
1802         kmem_cache_free(kvm_vcpu_cache, vcpu);
1803 }
1804 
1805 static int kvmppc_vcpu_run_pr(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
1806 {
1807         int ret;
1808 #ifdef CONFIG_ALTIVEC
1809         unsigned long uninitialized_var(vrsave);
1810 #endif
1811 
1812         /* Check if we can run the vcpu at all */
1813         if (!vcpu->arch.sane) {
1814                 kvm_run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1815                 ret = -EINVAL;
1816                 goto out;
1817         }
1818 
1819         kvmppc_setup_debug(vcpu);
1820 
1821         /*
1822          * Interrupts could be timers for the guest which we have to inject
1823          * again, so let's postpone them until we're in the guest and if we
1824          * really did time things so badly, then we just exit again due to
1825          * a host external interrupt.
1826          */
1827         ret = kvmppc_prepare_to_enter(vcpu);
1828         if (ret <= 0)
1829                 goto out;
1830         /* interrupts now hard-disabled */
1831 
1832         /* Save FPU, Altivec and VSX state */
1833         giveup_all(current);
1834 
1835         /* Preload FPU if it's enabled */
1836         if (kvmppc_get_msr(vcpu) & MSR_FP)
1837                 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
1838 
1839         kvmppc_fix_ee_before_entry();
1840 
1841         ret = __kvmppc_vcpu_run(kvm_run, vcpu);
1842 
1843         kvmppc_clear_debug(vcpu);
1844 
1845         /* No need for guest_exit. It's done in handle_exit.
1846            We also get here with interrupts enabled. */
1847 
1848         /* Make sure we save the guest FPU/Altivec/VSX state */
1849         kvmppc_giveup_ext(vcpu, MSR_FP | MSR_VEC | MSR_VSX);
1850 
1851         /* Make sure we save the guest TAR/EBB/DSCR state */
1852         kvmppc_giveup_fac(vcpu, FSCR_TAR_LG);
1853 
1854 out:
1855         vcpu->mode = OUTSIDE_GUEST_MODE;
1856         return ret;
1857 }
1858 
1859 /*
1860  * Get (and clear) the dirty memory log for a memory slot.
1861  */
1862 static int kvm_vm_ioctl_get_dirty_log_pr(struct kvm *kvm,
1863                                          struct kvm_dirty_log *log)
1864 {
1865         struct kvm_memslots *slots;
1866         struct kvm_memory_slot *memslot;
1867         struct kvm_vcpu *vcpu;
1868         ulong ga, ga_end;
1869         int is_dirty = 0;
1870         int r;
1871         unsigned long n;
1872 
1873         mutex_lock(&kvm->slots_lock);
1874 
1875         r = kvm_get_dirty_log(kvm, log, &is_dirty);
1876         if (r)
1877                 goto out;
1878 
1879         /* If nothing is dirty, don't bother messing with page tables. */
1880         if (is_dirty) {
1881                 slots = kvm_memslots(kvm);
1882                 memslot = id_to_memslot(slots, log->slot);
1883 
1884                 ga = memslot->base_gfn << PAGE_SHIFT;
1885                 ga_end = ga + (memslot->npages << PAGE_SHIFT);
1886 
1887                 kvm_for_each_vcpu(n, vcpu, kvm)
1888                         kvmppc_mmu_pte_pflush(vcpu, ga, ga_end);
1889 
1890                 n = kvm_dirty_bitmap_bytes(memslot);
1891                 memset(memslot->dirty_bitmap, 0, n);
1892         }
1893 
1894         r = 0;
1895 out:
1896         mutex_unlock(&kvm->slots_lock);
1897         return r;
1898 }
1899 
1900 static void kvmppc_core_flush_memslot_pr(struct kvm *kvm,
1901                                          struct kvm_memory_slot *memslot)
1902 {
1903         return;
1904 }
1905 
1906 static int kvmppc_core_prepare_memory_region_pr(struct kvm *kvm,
1907                                         struct kvm_memory_slot *memslot,
1908                                         const struct kvm_userspace_memory_region *mem)
1909 {
1910         return 0;
1911 }
1912 
1913 static void kvmppc_core_commit_memory_region_pr(struct kvm *kvm,
1914                                 const struct kvm_userspace_memory_region *mem,
1915                                 const struct kvm_memory_slot *old,
1916                                 const struct kvm_memory_slot *new,
1917                                 enum kvm_mr_change change)
1918 {
1919         return;
1920 }
1921 
1922 static void kvmppc_core_free_memslot_pr(struct kvm_memory_slot *free,
1923                                         struct kvm_memory_slot *dont)
1924 {
1925         return;
1926 }
1927 
1928 static int kvmppc_core_create_memslot_pr(struct kvm_memory_slot *slot,
1929                                          unsigned long npages)
1930 {
1931         return 0;
1932 }
1933 
1934 
1935 #ifdef CONFIG_PPC64
1936 static int kvm_vm_ioctl_get_smmu_info_pr(struct kvm *kvm,
1937                                          struct kvm_ppc_smmu_info *info)
1938 {
1939         long int i;
1940         struct kvm_vcpu *vcpu;
1941 
1942         info->flags = 0;
1943 
1944         /* SLB is always 64 entries */
1945         info->slb_size = 64;
1946 
1947         /* Standard 4k base page size segment */
1948         info->sps[0].page_shift = 12;
1949         info->sps[0].slb_enc = 0;
1950         info->sps[0].enc[0].page_shift = 12;
1951         info->sps[0].enc[0].pte_enc = 0;
1952 
1953         /*
1954          * 64k large page size.
1955          * We only want to put this in if the CPUs we're emulating
1956          * support it, but unfortunately we don't have a vcpu easily
1957          * to hand here to test.  Just pick the first vcpu, and if
1958          * that doesn't exist yet, report the minimum capability,
1959          * i.e., no 64k pages.
1960          * 1T segment support goes along with 64k pages.
1961          */
1962         i = 1;
1963         vcpu = kvm_get_vcpu(kvm, 0);
1964         if (vcpu && (vcpu->arch.hflags & BOOK3S_HFLAG_MULTI_PGSIZE)) {
1965                 info->flags = KVM_PPC_1T_SEGMENTS;
1966                 info->sps[i].page_shift = 16;
1967                 info->sps[i].slb_enc = SLB_VSID_L | SLB_VSID_LP_01;
1968                 info->sps[i].enc[0].page_shift = 16;
1969                 info->sps[i].enc[0].pte_enc = 1;
1970                 ++i;
1971         }
1972 
1973         /* Standard 16M large page size segment */
1974         info->sps[i].page_shift = 24;
1975         info->sps[i].slb_enc = SLB_VSID_L;
1976         info->sps[i].enc[0].page_shift = 24;
1977         info->sps[i].enc[0].pte_enc = 0;
1978 
1979         return 0;
1980 }
1981 
1982 static int kvm_configure_mmu_pr(struct kvm *kvm, struct kvm_ppc_mmuv3_cfg *cfg)
1983 {
1984         if (!cpu_has_feature(CPU_FTR_ARCH_300))
1985                 return -ENODEV;
1986         /* Require flags and process table base and size to all be zero. */
1987         if (cfg->flags || cfg->process_table)
1988                 return -EINVAL;
1989         return 0;
1990 }
1991 
1992 #else
1993 static int kvm_vm_ioctl_get_smmu_info_pr(struct kvm *kvm,
1994                                          struct kvm_ppc_smmu_info *info)
1995 {
1996         /* We should not get called */
1997         BUG();
1998 }
1999 #endif /* CONFIG_PPC64 */
2000 
2001 static unsigned int kvm_global_user_count = 0;
2002 static DEFINE_SPINLOCK(kvm_global_user_count_lock);
2003 
2004 static int kvmppc_core_init_vm_pr(struct kvm *kvm)
2005 {
2006         mutex_init(&kvm->arch.hpt_mutex);
2007 
2008 #ifdef CONFIG_PPC_BOOK3S_64
2009         /* Start out with the default set of hcalls enabled */
2010         kvmppc_pr_init_default_hcalls(kvm);
2011 #endif
2012 
2013         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
2014                 spin_lock(&kvm_global_user_count_lock);
2015                 if (++kvm_global_user_count == 1)
2016                         pseries_disable_reloc_on_exc();
2017                 spin_unlock(&kvm_global_user_count_lock);
2018         }
2019         return 0;
2020 }
2021 
2022 static void kvmppc_core_destroy_vm_pr(struct kvm *kvm)
2023 {
2024 #ifdef CONFIG_PPC64
2025         WARN_ON(!list_empty(&kvm->arch.spapr_tce_tables));
2026 #endif
2027 
2028         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
2029                 spin_lock(&kvm_global_user_count_lock);
2030                 BUG_ON(kvm_global_user_count == 0);
2031                 if (--kvm_global_user_count == 0)
2032                         pseries_enable_reloc_on_exc();
2033                 spin_unlock(&kvm_global_user_count_lock);
2034         }
2035 }
2036 
2037 static int kvmppc_core_check_processor_compat_pr(void)
2038 {
2039         /*
2040          * PR KVM can work on POWER9 inside a guest partition
2041          * running in HPT mode.  It can't work if we are using
2042          * radix translation (because radix provides no way for
2043          * a process to have unique translations in quadrant 3).
2044          */
2045         if (cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled())
2046                 return -EIO;
2047         return 0;
2048 }
2049 
2050 static long kvm_arch_vm_ioctl_pr(struct file *filp,
2051                                  unsigned int ioctl, unsigned long arg)
2052 {
2053         return -ENOTTY;
2054 }
2055 
2056 static struct kvmppc_ops kvm_ops_pr = {
2057         .get_sregs = kvm_arch_vcpu_ioctl_get_sregs_pr,
2058         .set_sregs = kvm_arch_vcpu_ioctl_set_sregs_pr,
2059         .get_one_reg = kvmppc_get_one_reg_pr,
2060         .set_one_reg = kvmppc_set_one_reg_pr,
2061         .vcpu_load   = kvmppc_core_vcpu_load_pr,
2062         .vcpu_put    = kvmppc_core_vcpu_put_pr,
2063         .set_msr     = kvmppc_set_msr_pr,
2064         .vcpu_run    = kvmppc_vcpu_run_pr,
2065         .vcpu_create = kvmppc_core_vcpu_create_pr,
2066         .vcpu_free   = kvmppc_core_vcpu_free_pr,
2067         .check_requests = kvmppc_core_check_requests_pr,
2068         .get_dirty_log = kvm_vm_ioctl_get_dirty_log_pr,
2069         .flush_memslot = kvmppc_core_flush_memslot_pr,
2070         .prepare_memory_region = kvmppc_core_prepare_memory_region_pr,
2071         .commit_memory_region = kvmppc_core_commit_memory_region_pr,
2072         .unmap_hva_range = kvm_unmap_hva_range_pr,
2073         .age_hva  = kvm_age_hva_pr,
2074         .test_age_hva = kvm_test_age_hva_pr,
2075         .set_spte_hva = kvm_set_spte_hva_pr,
2076         .mmu_destroy  = kvmppc_mmu_destroy_pr,
2077         .free_memslot = kvmppc_core_free_memslot_pr,
2078         .create_memslot = kvmppc_core_create_memslot_pr,
2079         .init_vm = kvmppc_core_init_vm_pr,
2080         .destroy_vm = kvmppc_core_destroy_vm_pr,
2081         .get_smmu_info = kvm_vm_ioctl_get_smmu_info_pr,
2082         .emulate_op = kvmppc_core_emulate_op_pr,
2083         .emulate_mtspr = kvmppc_core_emulate_mtspr_pr,
2084         .emulate_mfspr = kvmppc_core_emulate_mfspr_pr,
2085         .fast_vcpu_kick = kvm_vcpu_kick,
2086         .arch_vm_ioctl  = kvm_arch_vm_ioctl_pr,
2087 #ifdef CONFIG_PPC_BOOK3S_64
2088         .hcall_implemented = kvmppc_hcall_impl_pr,
2089         .configure_mmu = kvm_configure_mmu_pr,
2090 #endif
2091         .giveup_ext = kvmppc_giveup_ext,
2092 };
2093 
2094 
2095 int kvmppc_book3s_init_pr(void)
2096 {
2097         int r;
2098 
2099         r = kvmppc_core_check_processor_compat_pr();
2100         if (r < 0)
2101                 return r;
2102 
2103         kvm_ops_pr.owner = THIS_MODULE;
2104         kvmppc_pr_ops = &kvm_ops_pr;
2105 
2106         r = kvmppc_mmu_hpte_sysinit();
2107         return r;
2108 }
2109 
2110 void kvmppc_book3s_exit_pr(void)
2111 {
2112         kvmppc_pr_ops = NULL;
2113         kvmppc_mmu_hpte_sysexit();
2114 }
2115 
2116 /*
2117  * We only support separate modules for book3s 64
2118  */
2119 #ifdef CONFIG_PPC_BOOK3S_64
2120 
2121 module_init(kvmppc_book3s_init_pr);
2122 module_exit(kvmppc_book3s_exit_pr);
2123 
2124 MODULE_LICENSE("GPL");
2125 MODULE_ALIAS_MISCDEV(KVM_MINOR);
2126 MODULE_ALIAS("devname:kvm");
2127 #endif
/* [<][>][^][v][top][bottom][index][help] */
root/arch/powerpc/kvm/book3s_pr.c

DEFINITIONS
