arch/powerpc/kvm/book3s_pr.c

   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 static void kvmppc_unfixup_split_real(struct kvm_vcpu *vcpu)
  94 {
  95         if (vcpu->arch.hflags & BOOK3S_HFLAG_SPLIT_HACK) {
  96                 ulong pc = kvmppc_get_pc(vcpu);
  97                 ulong lr = kvmppc_get_lr(vcpu);
  98                 if ((pc & SPLIT_HACK_MASK) == SPLIT_HACK_OFFS)
  99                         kvmppc_set_pc(vcpu, pc & ~SPLIT_HACK_MASK);
 100                 if ((lr & SPLIT_HACK_MASK) == SPLIT_HACK_OFFS)
 101                         kvmppc_set_lr(vcpu, lr & ~SPLIT_HACK_MASK);
 102                 vcpu->arch.hflags &= ~BOOK3S_HFLAG_SPLIT_HACK;
 103         }
 104 }
 105
 106 static void kvmppc_inject_interrupt_pr(struct kvm_vcpu *vcpu, int vec, u64 srr1_flags)
 107 {
 108         unsigned long msr, pc, new_msr, new_pc;
 109
 110         kvmppc_unfixup_split_real(vcpu);
 111
 112         msr = kvmppc_get_msr(vcpu);
 113         pc = kvmppc_get_pc(vcpu);
 114         new_msr = vcpu->arch.intr_msr;
 115         new_pc = to_book3s(vcpu)->hior + vec;
 116
 117 #ifdef CONFIG_PPC_BOOK3S_64
 118         /* If transactional, change to suspend mode on IRQ delivery */
 119         if (MSR_TM_TRANSACTIONAL(msr))
 120                 new_msr |= MSR_TS_S;
 121         else
 122                 new_msr |= msr & MSR_TS_MASK;
 123 #endif
 124
 125         kvmppc_set_srr0(vcpu, pc);
 126         kvmppc_set_srr1(vcpu, (msr & SRR1_MSR_BITS) | srr1_flags);
 127         kvmppc_set_pc(vcpu, new_pc);
 128         kvmppc_set_msr(vcpu, new_msr);
 129 }
 130
 131 static void kvmppc_core_vcpu_load_pr(struct kvm_vcpu *vcpu, int cpu)
 132 {
 133 #ifdef CONFIG_PPC_BOOK3S_64
 134         struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 135         memcpy(svcpu->slb, to_book3s(vcpu)->slb_shadow, sizeof(svcpu->slb));
 136         svcpu->slb_max = to_book3s(vcpu)->slb_shadow_max;
 137         svcpu->in_use = 0;
 138         svcpu_put(svcpu);
 139 #endif
 140
 141         /* Disable AIL if supported */
 142         if (cpu_has_feature(CPU_FTR_HVMODE) &&
 143             cpu_has_feature(CPU_FTR_ARCH_207S))
 144                 mtspr(SPRN_LPCR, mfspr(SPRN_LPCR) & ~LPCR_AIL);
 145
 146         vcpu->cpu = smp_processor_id();
 147 #ifdef CONFIG_PPC_BOOK3S_32
 148         current->thread.kvm_shadow_vcpu = vcpu->arch.shadow_vcpu;
 149 #endif
 150
 151         if (kvmppc_is_split_real(vcpu))
 152                 kvmppc_fixup_split_real(vcpu);
 153
 154         kvmppc_restore_tm_pr(vcpu);
 155 }
 156
 157 static void kvmppc_core_vcpu_put_pr(struct kvm_vcpu *vcpu)
 158 {
 159 #ifdef CONFIG_PPC_BOOK3S_64
 160         struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 161         if (svcpu->in_use) {
 162                 kvmppc_copy_from_svcpu(vcpu);
 163         }
 164         memcpy(to_book3s(vcpu)->slb_shadow, svcpu->slb, sizeof(svcpu->slb));
 165         to_book3s(vcpu)->slb_shadow_max = svcpu->slb_max;
 166         svcpu_put(svcpu);
 167 #endif
 168
 169         if (kvmppc_is_split_real(vcpu))
 170                 kvmppc_unfixup_split_real(vcpu);
 171
 172         kvmppc_giveup_ext(vcpu, MSR_FP | MSR_VEC | MSR_VSX);
 173         kvmppc_giveup_fac(vcpu, FSCR_TAR_LG);
 174         kvmppc_save_tm_pr(vcpu);
 175
 176         /* Enable AIL if supported */
 177         if (cpu_has_feature(CPU_FTR_HVMODE) &&
 178             cpu_has_feature(CPU_FTR_ARCH_207S))
 179                 mtspr(SPRN_LPCR, mfspr(SPRN_LPCR) | LPCR_AIL_3);
 180
 181         vcpu->cpu = -1;
 182 }
 183
 184 /* Copy data needed by real-mode code from vcpu to shadow vcpu */
 185 void kvmppc_copy_to_svcpu(struct kvm_vcpu *vcpu)
 186 {
 187         struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 188
 189         svcpu->gpr[0] = vcpu->arch.regs.gpr[0];
 190         svcpu->gpr[1] = vcpu->arch.regs.gpr[1];
 191         svcpu->gpr[2] = vcpu->arch.regs.gpr[2];
 192         svcpu->gpr[3] = vcpu->arch.regs.gpr[3];
 193         svcpu->gpr[4] = vcpu->arch.regs.gpr[4];
 194         svcpu->gpr[5] = vcpu->arch.regs.gpr[5];
 195         svcpu->gpr[6] = vcpu->arch.regs.gpr[6];
 196         svcpu->gpr[7] = vcpu->arch.regs.gpr[7];
 197         svcpu->gpr[8] = vcpu->arch.regs.gpr[8];
 198         svcpu->gpr[9] = vcpu->arch.regs.gpr[9];
 199         svcpu->gpr[10] = vcpu->arch.regs.gpr[10];
 200         svcpu->gpr[11] = vcpu->arch.regs.gpr[11];
 201         svcpu->gpr[12] = vcpu->arch.regs.gpr[12];
 202         svcpu->gpr[13] = vcpu->arch.regs.gpr[13];
 203         svcpu->cr  = vcpu->arch.regs.ccr;
 204         svcpu->xer = vcpu->arch.regs.xer;
 205         svcpu->ctr = vcpu->arch.regs.ctr;
 206         svcpu->lr  = vcpu->arch.regs.link;
 207         svcpu->pc  = vcpu->arch.regs.nip;
 208 #ifdef CONFIG_PPC_BOOK3S_64
 209         svcpu->shadow_fscr = vcpu->arch.shadow_fscr;
 210 #endif
 211         /*
 212          * Now also save the current time base value. We use this
 213          * to find the guest purr and spurr value.
 214          */
 215         vcpu->arch.entry_tb = get_tb();
 216         vcpu->arch.entry_vtb = get_vtb();
 217         if (cpu_has_feature(CPU_FTR_ARCH_207S))
 218                 vcpu->arch.entry_ic = mfspr(SPRN_IC);
 219         svcpu->in_use = true;
 220
 221         svcpu_put(svcpu);
 222 }
 223
 224 static void kvmppc_recalc_shadow_msr(struct kvm_vcpu *vcpu)
 225 {
 226         ulong guest_msr = kvmppc_get_msr(vcpu);
 227         ulong smsr = guest_msr;
 228
 229         /* Guest MSR values */
 230 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 231         smsr &= MSR_FE0 | MSR_FE1 | MSR_SF | MSR_SE | MSR_BE | MSR_LE |
 232                 MSR_TM | MSR_TS_MASK;
 233 #else
 234         smsr &= MSR_FE0 | MSR_FE1 | MSR_SF | MSR_SE | MSR_BE | MSR_LE;
 235 #endif
 236         /* Process MSR values */
 237         smsr |= MSR_ME | MSR_RI | MSR_IR | MSR_DR | MSR_PR | MSR_EE;
 238         /* External providers the guest reserved */
 239         smsr |= (guest_msr & vcpu->arch.guest_owned_ext);
 240         /* 64-bit Process MSR values */
 241 #ifdef CONFIG_PPC_BOOK3S_64
 242         smsr |= MSR_ISF | MSR_HV;
 243 #endif
 244 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 245         /*
 246          * in guest privileged state, we want to fail all TM transactions.
 247          * So disable MSR TM bit so that all tbegin. will be able to be
 248          * trapped into host.
 249          */
 250         if (!(guest_msr & MSR_PR))
 251                 smsr &= ~MSR_TM;
 252 #endif
 253         vcpu->arch.shadow_msr = smsr;
 254 }
 255
 256 /* Copy data touched by real-mode code from shadow vcpu back to vcpu */
 257 void kvmppc_copy_from_svcpu(struct kvm_vcpu *vcpu)
 258 {
 259         struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
 260 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 261         ulong old_msr;
 262 #endif
 263
 264         /*
 265          * Maybe we were already preempted and synced the svcpu from
 266          * our preempt notifiers. Don't bother touching this svcpu then.
 267          */
 268         if (!svcpu->in_use)
 269                 goto out;
 270
 271         vcpu->arch.regs.gpr[0] = svcpu->gpr[0];
 272         vcpu->arch.regs.gpr[1] = svcpu->gpr[1];
 273         vcpu->arch.regs.gpr[2] = svcpu->gpr[2];
 274         vcpu->arch.regs.gpr[3] = svcpu->gpr[3];
 275         vcpu->arch.regs.gpr[4] = svcpu->gpr[4];
 276         vcpu->arch.regs.gpr[5] = svcpu->gpr[5];
 277         vcpu->arch.regs.gpr[6] = svcpu->gpr[6];
 278         vcpu->arch.regs.gpr[7] = svcpu->gpr[7];
 279         vcpu->arch.regs.gpr[8] = svcpu->gpr[8];
 280         vcpu->arch.regs.gpr[9] = svcpu->gpr[9];
 281         vcpu->arch.regs.gpr[10] = svcpu->gpr[10];
 282         vcpu->arch.regs.gpr[11] = svcpu->gpr[11];
 283         vcpu->arch.regs.gpr[12] = svcpu->gpr[12];
 284         vcpu->arch.regs.gpr[13] = svcpu->gpr[13];
 285         vcpu->arch.regs.ccr  = svcpu->cr;
 286         vcpu->arch.regs.xer = svcpu->xer;
 287         vcpu->arch.regs.ctr = svcpu->ctr;
 288         vcpu->arch.regs.link  = svcpu->lr;
 289         vcpu->arch.regs.nip  = svcpu->pc;
 290         vcpu->arch.shadow_srr1 = svcpu->shadow_srr1;
 291         vcpu->arch.fault_dar   = svcpu->fault_dar;
 292         vcpu->arch.fault_dsisr = svcpu->fault_dsisr;
 293         vcpu->arch.last_inst   = svcpu->last_inst;
 294 #ifdef CONFIG_PPC_BOOK3S_64
 295         vcpu->arch.shadow_fscr = svcpu->shadow_fscr;
 296 #endif
 297         /*
 298          * Update purr and spurr using time base on exit.
 299          */
 300         vcpu->arch.purr += get_tb() - vcpu->arch.entry_tb;
 301         vcpu->arch.spurr += get_tb() - vcpu->arch.entry_tb;
 302         to_book3s(vcpu)->vtb += get_vtb() - vcpu->arch.entry_vtb;
 303         if (cpu_has_feature(CPU_FTR_ARCH_207S))
 304                 vcpu->arch.ic += mfspr(SPRN_IC) - vcpu->arch.entry_ic;
 305
 306 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 307         /*
 308          * Unlike other MSR bits, MSR[TS]bits can be changed at guest without
 309          * notifying host:
 310          *  modified by unprivileged instructions like "tbegin"/"tend"/
 311          * "tresume"/"tsuspend" in PR KVM guest.
 312          *
 313          * It is necessary to sync here to calculate a correct shadow_msr.
 314          *
 315          * privileged guest's tbegin will be failed at present. So we
 316          * only take care of problem state guest.
 317          */
 318         old_msr = kvmppc_get_msr(vcpu);
 319         if (unlikely((old_msr & MSR_PR) &&
 320                 (vcpu->arch.shadow_srr1 & (MSR_TS_MASK)) !=
 321                                 (old_msr & (MSR_TS_MASK)))) {
 322                 old_msr &= ~(MSR_TS_MASK);
 323                 old_msr |= (vcpu->arch.shadow_srr1 & (MSR_TS_MASK));
 324                 kvmppc_set_msr_fast(vcpu, old_msr);
 325                 kvmppc_recalc_shadow_msr(vcpu);
 326         }
 327 #endif
 328
 329         svcpu->in_use = false;
 330
 331 out:
 332         svcpu_put(svcpu);
 333 }
 334
 335 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 336 void kvmppc_save_tm_sprs(struct kvm_vcpu *vcpu)
 337 {
 338         tm_enable();
 339         vcpu->arch.tfhar = mfspr(SPRN_TFHAR);
 340         vcpu->arch.texasr = mfspr(SPRN_TEXASR);
 341         vcpu->arch.tfiar = mfspr(SPRN_TFIAR);
 342         tm_disable();
 343 }
 344
 345 void kvmppc_restore_tm_sprs(struct kvm_vcpu *vcpu)
 346 {
 347         tm_enable();
 348         mtspr(SPRN_TFHAR, vcpu->arch.tfhar);
 349         mtspr(SPRN_TEXASR, vcpu->arch.texasr);
 350         mtspr(SPRN_TFIAR, vcpu->arch.tfiar);
 351         tm_disable();
 352 }
 353
 354 /* loadup math bits which is enabled at kvmppc_get_msr() but not enabled at
 355  * hardware.
 356  */
 357 static void kvmppc_handle_lost_math_exts(struct kvm_vcpu *vcpu)
 358 {
 359         ulong exit_nr;
 360         ulong ext_diff = (kvmppc_get_msr(vcpu) & ~vcpu->arch.guest_owned_ext) &
 361                 (MSR_FP | MSR_VEC | MSR_VSX);
 362
 363         if (!ext_diff)
 364                 return;
 365
 366         if (ext_diff == MSR_FP)
 367                 exit_nr = BOOK3S_INTERRUPT_FP_UNAVAIL;
 368         else if (ext_diff == MSR_VEC)
 369                 exit_nr = BOOK3S_INTERRUPT_ALTIVEC;
 370         else
 371                 exit_nr = BOOK3S_INTERRUPT_VSX;
 372
 373         kvmppc_handle_ext(vcpu, exit_nr, ext_diff);
 374 }
 375
 376 void kvmppc_save_tm_pr(struct kvm_vcpu *vcpu)
 377 {
 378         if (!(MSR_TM_ACTIVE(kvmppc_get_msr(vcpu)))) {
 379                 kvmppc_save_tm_sprs(vcpu);
 380                 return;
 381         }
 382
 383         kvmppc_giveup_fac(vcpu, FSCR_TAR_LG);
 384         kvmppc_giveup_ext(vcpu, MSR_VSX);
 385
 386         preempt_disable();
 387         _kvmppc_save_tm_pr(vcpu, mfmsr());
 388         preempt_enable();
 389 }
 390
 391 void kvmppc_restore_tm_pr(struct kvm_vcpu *vcpu)
 392 {
 393         if (!MSR_TM_ACTIVE(kvmppc_get_msr(vcpu))) {
 394                 kvmppc_restore_tm_sprs(vcpu);
 395                 if (kvmppc_get_msr(vcpu) & MSR_TM) {
 396                         kvmppc_handle_lost_math_exts(vcpu);
 397                         if (vcpu->arch.fscr & FSCR_TAR)
 398                                 kvmppc_handle_fac(vcpu, FSCR_TAR_LG);
 399                 }
 400                 return;
 401         }
 402
 403         preempt_disable();
 404         _kvmppc_restore_tm_pr(vcpu, kvmppc_get_msr(vcpu));
 405         preempt_enable();
 406
 407         if (kvmppc_get_msr(vcpu) & MSR_TM) {
 408                 kvmppc_handle_lost_math_exts(vcpu);
 409                 if (vcpu->arch.fscr & FSCR_TAR)
 410                         kvmppc_handle_fac(vcpu, FSCR_TAR_LG);
 411         }
 412 }
 413 #endif
 414
 415 static int kvmppc_core_check_requests_pr(struct kvm_vcpu *vcpu)
 416 {
 417         int r = 1; /* Indicate we want to get back into the guest */
 418
 419         /* We misuse TLB_FLUSH to indicate that we want to clear
 420            all shadow cache entries */
 421         if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu))
 422                 kvmppc_mmu_pte_flush(vcpu, 0, 0);
 423
 424         return r;
 425 }
 426
 427 /************* MMU Notifiers *************/
 428 static void do_kvm_unmap_hva(struct kvm *kvm, unsigned long start,
 429                              unsigned long end)
 430 {
 431         long i;
 432         struct kvm_vcpu *vcpu;
 433         struct kvm_memslots *slots;
 434         struct kvm_memory_slot *memslot;
 435
 436         slots = kvm_memslots(kvm);
 437         kvm_for_each_memslot(memslot, slots) {
 438                 unsigned long hva_start, hva_end;
 439                 gfn_t gfn, gfn_end;
 440
 441                 hva_start = max(start, memslot->userspace_addr);
 442                 hva_end = min(end, memslot->userspace_addr +
 443                                         (memslot->npages << PAGE_SHIFT));
 444                 if (hva_start >= hva_end)
 445                         continue;
 446                 /*
 447                  * {gfn(page) | page intersects with [hva_start, hva_end)} =
 448                  * {gfn, gfn+1, ..., gfn_end-1}.
 449                  */
 450                 gfn = hva_to_gfn_memslot(hva_start, memslot);
 451                 gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot);
 452                 kvm_for_each_vcpu(i, vcpu, kvm)
 453                         kvmppc_mmu_pte_pflush(vcpu, gfn << PAGE_SHIFT,
 454                                               gfn_end << PAGE_SHIFT);
 455         }
 456 }
 457
 458 static int kvm_unmap_hva_range_pr(struct kvm *kvm, unsigned long start,
 459                                   unsigned long end)
 460 {
 461         do_kvm_unmap_hva(kvm, start, end);
 462
 463         return 0;
 464 }
 465
 466 static int kvm_age_hva_pr(struct kvm *kvm, unsigned long start,
 467                           unsigned long end)
 468 {
 469         /* XXX could be more clever ;) */
 470         return 0;
 471 }
 472
 473 static int kvm_test_age_hva_pr(struct kvm *kvm, unsigned long hva)
 474 {
 475         /* XXX could be more clever ;) */
 476         return 0;
 477 }
 478
 479 static void kvm_set_spte_hva_pr(struct kvm *kvm, unsigned long hva, pte_t pte)
 480 {
 481         /* The page will get remapped properly on its next fault */
 482         do_kvm_unmap_hva(kvm, hva, hva + PAGE_SIZE);
 483 }
 484
 485 /*****************************************/
 486
 487 static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)
 488 {
 489         ulong old_msr;
 490
 491         /* For PAPR guest, make sure MSR reflects guest mode */
 492         if (vcpu->arch.papr_enabled)
 493                 msr = (msr & ~MSR_HV) | MSR_ME;
 494
 495 #ifdef EXIT_DEBUG
 496         printk(KERN_INFO "KVM: Set MSR to 0x%llx\n", msr);
 497 #endif
 498
 499 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 500         /* We should never target guest MSR to TS=10 && PR=0,
 501          * since we always fail transaction for guest privilege
 502          * state.
 503          */
 504         if (!(msr & MSR_PR) && MSR_TM_TRANSACTIONAL(msr))
 505                 kvmppc_emulate_tabort(vcpu,
 506                         TM_CAUSE_KVM_FAC_UNAV | TM_CAUSE_PERSISTENT);
 507 #endif
 508
 509         old_msr = kvmppc_get_msr(vcpu);
 510         msr &= to_book3s(vcpu)->msr_mask;
 511         kvmppc_set_msr_fast(vcpu, msr);
 512         kvmppc_recalc_shadow_msr(vcpu);
 513
 514         if (msr & MSR_POW) {
 515                 if (!vcpu->arch.pending_exceptions) {
 516                         kvm_vcpu_block(vcpu);
 517                         kvm_clear_request(KVM_REQ_UNHALT, vcpu);
 518                         vcpu->stat.halt_wakeup++;
 519
 520                         /* Unset POW bit after we woke up */
 521                         msr &= ~MSR_POW;
 522                         kvmppc_set_msr_fast(vcpu, msr);
 523                 }
 524         }
 525
 526         if (kvmppc_is_split_real(vcpu))
 527                 kvmppc_fixup_split_real(vcpu);
 528         else
 529                 kvmppc_unfixup_split_real(vcpu);
 530
 531         if ((kvmppc_get_msr(vcpu) & (MSR_PR|MSR_IR|MSR_DR)) !=
 532                    (old_msr & (MSR_PR|MSR_IR|MSR_DR))) {
 533                 kvmppc_mmu_flush_segments(vcpu);
 534                 kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
 535
 536                 /* Preload magic page segment when in kernel mode */
 537                 if (!(msr & MSR_PR) && vcpu->arch.magic_page_pa) {
 538                         struct kvm_vcpu_arch *a = &vcpu->arch;
 539
 540                         if (msr & MSR_DR)
 541                                 kvmppc_mmu_map_segment(vcpu, a->magic_page_ea);
 542                         else
 543                                 kvmppc_mmu_map_segment(vcpu, a->magic_page_pa);
 544                 }
 545         }
 546
 547         /*
 548          * When switching from 32 to 64-bit, we may have a stale 32-bit
 549          * magic page around, we need to flush it. Typically 32-bit magic
 550          * page will be instantiated when calling into RTAS. Note: We
 551          * assume that such transition only happens while in kernel mode,
 552          * ie, we never transition from user 32-bit to kernel 64-bit with
 553          * a 32-bit magic page around.
 554          */
 555         if (vcpu->arch.magic_page_pa &&
 556             !(old_msr & MSR_PR) && !(old_msr & MSR_SF) && (msr & MSR_SF)) {
 557                 /* going from RTAS to normal kernel code */
 558                 kvmppc_mmu_pte_flush(vcpu, (uint32_t)vcpu->arch.magic_page_pa,
 559                                      ~0xFFFUL);
 560         }
 561
 562         /* Preload FPU if it's enabled */
 563         if (kvmppc_get_msr(vcpu) & MSR_FP)
 564                 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
 565
 566 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 567         if (kvmppc_get_msr(vcpu) & MSR_TM)
 568                 kvmppc_handle_lost_math_exts(vcpu);
 569 #endif
 570 }
 571
 572 void kvmppc_set_pvr_pr(struct kvm_vcpu *vcpu, u32 pvr)
 573 {
 574         u32 host_pvr;
 575
 576         vcpu->arch.hflags &= ~BOOK3S_HFLAG_SLB;
 577         vcpu->arch.pvr = pvr;
 578 #ifdef CONFIG_PPC_BOOK3S_64
 579         if ((pvr >= 0x330000) && (pvr < 0x70330000)) {
 580                 kvmppc_mmu_book3s_64_init(vcpu);
 581                 if (!to_book3s(vcpu)->hior_explicit)
 582                         to_book3s(vcpu)->hior = 0xfff00000;
 583                 to_book3s(vcpu)->msr_mask = 0xffffffffffffffffULL;
 584                 vcpu->arch.cpu_type = KVM_CPU_3S_64;
 585         } else
 586 #endif
 587         {
 588                 kvmppc_mmu_book3s_32_init(vcpu);
 589                 if (!to_book3s(vcpu)->hior_explicit)
 590                         to_book3s(vcpu)->hior = 0;
 591                 to_book3s(vcpu)->msr_mask = 0xffffffffULL;
 592                 vcpu->arch.cpu_type = KVM_CPU_3S_32;
 593         }
 594
 595         kvmppc_sanity_check(vcpu);
 596
 597         /* If we are in hypervisor level on 970, we can tell the CPU to
 598          * treat DCBZ as 32 bytes store */
 599         vcpu->arch.hflags &= ~BOOK3S_HFLAG_DCBZ32;
 600         if (vcpu->arch.mmu.is_dcbz32(vcpu) && (mfmsr() & MSR_HV) &&
 601             !strcmp(cur_cpu_spec->platform, "ppc970"))
 602                 vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
 603
 604         /* Cell performs badly if MSR_FEx are set. So let's hope nobody
 605            really needs them in a VM on Cell and force disable them. */
 606         if (!strcmp(cur_cpu_spec->platform, "ppc-cell-be"))
 607                 to_book3s(vcpu)->msr_mask &= ~(MSR_FE0 | MSR_FE1);
 608
 609         /*
 610          * If they're asking for POWER6 or later, set the flag
 611          * indicating that we can do multiple large page sizes
 612          * and 1TB segments.
 613          * Also set the flag that indicates that tlbie has the large
 614          * page bit in the RB operand instead of the instruction.
 615          */
 616         switch (PVR_VER(pvr)) {
 617         case PVR_POWER6:
 618         case PVR_POWER7:
 619         case PVR_POWER7p:
 620         case PVR_POWER8:
 621         case PVR_POWER8E:
 622         case PVR_POWER8NVL:
 623         case PVR_POWER9:
 624                 vcpu->arch.hflags |= BOOK3S_HFLAG_MULTI_PGSIZE |
 625                         BOOK3S_HFLAG_NEW_TLBIE;
 626                 break;
 627         }
 628
 629 #ifdef CONFIG_PPC_BOOK3S_32
 630         /* 32 bit Book3S always has 32 byte dcbz */
 631         vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
 632 #endif
 633
 634         /* On some CPUs we can execute paired single operations natively */
 635         asm ( "mfpvr %0" : "=r"(host_pvr));
 636         switch (host_pvr) {
 637         case 0x00080200:        /* lonestar 2.0 */
 638         case 0x00088202:        /* lonestar 2.2 */
 639         case 0x70000100:        /* gekko 1.0 */
 640         case 0x00080100:        /* gekko 2.0 */
 641         case 0x00083203:        /* gekko 2.3a */
 642         case 0x00083213:        /* gekko 2.3b */
 643         case 0x00083204:        /* gekko 2.4 */
 644         case 0x00083214:        /* gekko 2.4e (8SE) - retail HW2 */
 645         case 0x00087200:        /* broadway */
 646                 vcpu->arch.hflags |= BOOK3S_HFLAG_NATIVE_PS;
 647                 /* Enable HID2.PSE - in case we need it later */
 648                 mtspr(SPRN_HID2_GEKKO, mfspr(SPRN_HID2_GEKKO) | (1 << 29));
 649         }
 650 }
 651
 652 /* Book3s_32 CPUs always have 32 bytes cache line size, which Linux assumes. To
 653  * make Book3s_32 Linux work on Book3s_64, we have to make sure we trap dcbz to
 654  * emulate 32 bytes dcbz length.
 655  *
 656  * The Book3s_64 inventors also realized this case and implemented a special bit
 657  * in the HID5 register, which is a hypervisor ressource. Thus we can't use it.
 658  *
 659  * My approach here is to patch the dcbz instruction on executing pages.
 660  */
 661 static void kvmppc_patch_dcbz(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
 662 {
 663         struct page *hpage;
 664         u64 hpage_offset;
 665         u32 *page;
 666         int i;
 667
 668         hpage = gfn_to_page(vcpu->kvm, pte->raddr >> PAGE_SHIFT);
 669         if (is_error_page(hpage))
 670                 return;
 671
 672         hpage_offset = pte->raddr & ~PAGE_MASK;
 673         hpage_offset &= ~0xFFFULL;
 674         hpage_offset /= 4;
 675
 676         get_page(hpage);
 677         page = kmap_atomic(hpage);
 678
 679         /* patch dcbz into reserved instruction, so we trap */
 680         for (i=hpage_offset; i < hpage_offset + (HW_PAGE_SIZE / 4); i++)
 681                 if ((be32_to_cpu(page[i]) & 0xff0007ff) == INS_DCBZ)
 682                         page[i] &= cpu_to_be32(0xfffffff7);
 683
 684         kunmap_atomic(page);
 685         put_page(hpage);
 686 }
 687
 688 static bool kvmppc_visible_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
 689 {
 690         ulong mp_pa = vcpu->arch.magic_page_pa;
 691
 692         if (!(kvmppc_get_msr(vcpu) & MSR_SF))
 693                 mp_pa = (uint32_t)mp_pa;
 694
 695         gpa &= ~0xFFFULL;
 696         if (unlikely(mp_pa) && unlikely((mp_pa & KVM_PAM) == (gpa & KVM_PAM))) {
 697                 return true;
 698         }
 699
 700         return kvm_is_visible_gfn(vcpu->kvm, gpa >> PAGE_SHIFT);
 701 }
 702
 703 int kvmppc_handle_pagefault(struct kvm_run *run, struct kvm_vcpu *vcpu,
 704                             ulong eaddr, int vec)
 705 {
 706         bool data = (vec == BOOK3S_INTERRUPT_DATA_STORAGE);
 707         bool iswrite = false;
 708         int r = RESUME_GUEST;
 709         int relocated;
 710         int page_found = 0;
 711         struct kvmppc_pte pte = { 0 };
 712         bool dr = (kvmppc_get_msr(vcpu) & MSR_DR) ? true : false;
 713         bool ir = (kvmppc_get_msr(vcpu) & MSR_IR) ? true : false;
 714         u64 vsid;
 715
 716         relocated = data ? dr : ir;
 717         if (data && (vcpu->arch.fault_dsisr & DSISR_ISSTORE))
 718                 iswrite = true;
 719
 720         /* Resolve real address if translation turned on */
 721         if (relocated) {
 722                 page_found = vcpu->arch.mmu.xlate(vcpu, eaddr, &pte, data, iswrite);
 723         } else {
 724                 pte.may_execute = true;
 725                 pte.may_read = true;
 726                 pte.may_write = true;
 727                 pte.raddr = eaddr & KVM_PAM;
 728                 pte.eaddr = eaddr;
 729                 pte.vpage = eaddr >> 12;
 730                 pte.page_size = MMU_PAGE_64K;
 731                 pte.wimg = HPTE_R_M;
 732         }
 733
 734         switch (kvmppc_get_msr(vcpu) & (MSR_DR|MSR_IR)) {
 735         case 0:
 736                 pte.vpage |= ((u64)VSID_REAL << (SID_SHIFT - 12));
 737                 break;
 738         case MSR_DR:
 739                 if (!data &&
 740                     (vcpu->arch.hflags & BOOK3S_HFLAG_SPLIT_HACK) &&
 741                     ((pte.raddr & SPLIT_HACK_MASK) == SPLIT_HACK_OFFS))
 742                         pte.raddr &= ~SPLIT_HACK_MASK;
 743                 /* fall through */
 744         case MSR_IR:
 745                 vcpu->arch.mmu.esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid);
 746
 747                 if ((kvmppc_get_msr(vcpu) & (MSR_DR|MSR_IR)) == MSR_DR)
 748                         pte.vpage |= ((u64)VSID_REAL_DR << (SID_SHIFT - 12));
 749                 else
 750                         pte.vpage |= ((u64)VSID_REAL_IR << (SID_SHIFT - 12));
 751                 pte.vpage |= vsid;
 752
 753                 if (vsid == -1)
 754                         page_found = -EINVAL;
 755                 break;
 756         }
 757
 758         if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
 759            (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
 760                 /*
 761                  * If we do the dcbz hack, we have to NX on every execution,
 762                  * so we can patch the executing code. This renders our guest
 763                  * NX-less.
 764                  */
 765                 pte.may_execute = !data;
 766         }
 767
 768         if (page_found == -ENOENT || page_found == -EPERM) {
 769                 /* Page not found in guest PTE entries, or protection fault */
 770                 u64 flags;
 771
 772                 if (page_found == -EPERM)
 773                         flags = DSISR_PROTFAULT;
 774                 else
 775                         flags = DSISR_NOHPTE;
 776                 if (data) {
 777                         flags |= vcpu->arch.fault_dsisr & DSISR_ISSTORE;
 778                         kvmppc_core_queue_data_storage(vcpu, eaddr, flags);
 779                 } else {
 780                         kvmppc_core_queue_inst_storage(vcpu, flags);
 781                 }
 782         } else if (page_found == -EINVAL) {
 783                 /* Page not found in guest SLB */
 784                 kvmppc_set_dar(vcpu, kvmppc_get_fault_dar(vcpu));
 785                 kvmppc_book3s_queue_irqprio(vcpu, vec + 0x80);
 786         } else if (kvmppc_visible_gpa(vcpu, pte.raddr)) {
 787                 if (data && !(vcpu->arch.fault_dsisr & DSISR_NOHPTE)) {
 788                         /*
 789                          * There is already a host HPTE there, presumably
 790                          * a read-only one for a page the guest thinks
 791                          * is writable, so get rid of it first.
 792                          */
 793                         kvmppc_mmu_unmap_page(vcpu, &pte);
 794                 }
 795                 /* The guest's PTE is not mapped yet. Map on the host */
 796                 if (kvmppc_mmu_map_page(vcpu, &pte, iswrite) == -EIO) {
 797                         /* Exit KVM if mapping failed */
 798                         run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
 799                         return RESUME_HOST;
 800                 }
 801                 if (data)
 802                         vcpu->stat.sp_storage++;
 803                 else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
 804                          (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32)))
 805                         kvmppc_patch_dcbz(vcpu, &pte);
 806         } else {
 807                 /* MMIO */
 808                 vcpu->stat.mmio_exits++;
 809                 vcpu->arch.paddr_accessed = pte.raddr;
 810                 vcpu->arch.vaddr_accessed = pte.eaddr;
 811                 r = kvmppc_emulate_mmio(run, vcpu);
 812                 if ( r == RESUME_HOST_NV )
 813                         r = RESUME_HOST;
 814         }
 815
 816         return r;
 817 }
 818
 819 /* Give up external provider (FPU, Altivec, VSX) */
 820 void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr)
 821 {
 822         struct thread_struct *t = &current->thread;
 823
 824         /*
 825          * VSX instructions can access FP and vector registers, so if
 826          * we are giving up VSX, make sure we give up FP and VMX as well.
 827          */
 828         if (msr & MSR_VSX)
 829                 msr |= MSR_FP | MSR_VEC;
 830
 831         msr &= vcpu->arch.guest_owned_ext;
 832         if (!msr)
 833                 return;
 834
 835 #ifdef DEBUG_EXT
 836         printk(KERN_INFO "Giving up ext 0x%lx\n", msr);
 837 #endif
 838
 839         if (msr & MSR_FP) {
 840                 /*
 841                  * Note that on CPUs with VSX, giveup_fpu stores
 842                  * both the traditional FP registers and the added VSX
 843                  * registers into thread.fp_state.fpr[].
 844                  */
 845                 if (t->regs->msr & MSR_FP)
 846                         giveup_fpu(current);
 847                 t->fp_save_area = NULL;
 848         }
 849
 850 #ifdef CONFIG_ALTIVEC
 851         if (msr & MSR_VEC) {
 852                 if (current->thread.regs->msr & MSR_VEC)
 853                         giveup_altivec(current);
 854                 t->vr_save_area = NULL;
 855         }
 856 #endif
 857
 858         vcpu->arch.guest_owned_ext &= ~(msr | MSR_VSX);
 859         kvmppc_recalc_shadow_msr(vcpu);
 860 }
 861
 862 /* Give up facility (TAR / EBB / DSCR) */
 863 void kvmppc_giveup_fac(struct kvm_vcpu *vcpu, ulong fac)
 864 {
 865 #ifdef CONFIG_PPC_BOOK3S_64
 866         if (!(vcpu->arch.shadow_fscr & (1ULL << fac))) {
 867                 /* Facility not available to the guest, ignore giveup request*/
 868                 return;
 869         }
 870
 871         switch (fac) {
 872         case FSCR_TAR_LG:
 873                 vcpu->arch.tar = mfspr(SPRN_TAR);
 874                 mtspr(SPRN_TAR, current->thread.tar);
 875                 vcpu->arch.shadow_fscr &= ~FSCR_TAR;
 876                 break;
 877         }
 878 #endif
 879 }
 880
 881 /* Handle external providers (FPU, Altivec, VSX) */
 882 static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
 883                              ulong msr)
 884 {
 885         struct thread_struct *t = &current->thread;
 886
 887         /* When we have paired singles, we emulate in software */
 888         if (vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE)
 889                 return RESUME_GUEST;
 890
 891         if (!(kvmppc_get_msr(vcpu) & msr)) {
 892                 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 893                 return RESUME_GUEST;
 894         }
 895
 896         if (msr == MSR_VSX) {
 897                 /* No VSX?  Give an illegal instruction interrupt */
 898 #ifdef CONFIG_VSX
 899                 if (!cpu_has_feature(CPU_FTR_VSX))
 900 #endif
 901                 {
 902                         kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
 903                         return RESUME_GUEST;
 904                 }
 905
 906                 /*
 907                  * We have to load up all the FP and VMX registers before
 908                  * we can let the guest use VSX instructions.
 909                  */
 910                 msr = MSR_FP | MSR_VEC | MSR_VSX;
 911         }
 912
 913         /* See if we already own all the ext(s) needed */
 914         msr &= ~vcpu->arch.guest_owned_ext;
 915         if (!msr)
 916                 return RESUME_GUEST;
 917
 918 #ifdef DEBUG_EXT
 919         printk(KERN_INFO "Loading up ext 0x%lx\n", msr);
 920 #endif
 921
 922         if (msr & MSR_FP) {
 923                 preempt_disable();
 924                 enable_kernel_fp();
 925                 load_fp_state(&vcpu->arch.fp);
 926                 disable_kernel_fp();
 927                 t->fp_save_area = &vcpu->arch.fp;
 928                 preempt_enable();
 929         }
 930
 931         if (msr & MSR_VEC) {
 932 #ifdef CONFIG_ALTIVEC
 933                 preempt_disable();
 934                 enable_kernel_altivec();
 935                 load_vr_state(&vcpu->arch.vr);
 936                 disable_kernel_altivec();
 937                 t->vr_save_area = &vcpu->arch.vr;
 938                 preempt_enable();
 939 #endif
 940         }
 941
 942         t->regs->msr |= msr;
 943         vcpu->arch.guest_owned_ext |= msr;
 944         kvmppc_recalc_shadow_msr(vcpu);
 945
 946         return RESUME_GUEST;
 947 }
 948
 949 /*
 950  * Kernel code using FP or VMX could have flushed guest state to
 951  * the thread_struct; if so, get it back now.
 952  */
 953 static void kvmppc_handle_lost_ext(struct kvm_vcpu *vcpu)
 954 {
 955         unsigned long lost_ext;
 956
 957         lost_ext = vcpu->arch.guest_owned_ext & ~current->thread.regs->msr;
 958         if (!lost_ext)
 959                 return;
 960
 961         if (lost_ext & MSR_FP) {
 962                 preempt_disable();
 963                 enable_kernel_fp();
 964                 load_fp_state(&vcpu->arch.fp);
 965                 disable_kernel_fp();
 966                 preempt_enable();
 967         }
 968 #ifdef CONFIG_ALTIVEC
 969         if (lost_ext & MSR_VEC) {
 970                 preempt_disable();
 971                 enable_kernel_altivec();
 972                 load_vr_state(&vcpu->arch.vr);
 973                 disable_kernel_altivec();
 974                 preempt_enable();
 975         }
 976 #endif
 977         current->thread.regs->msr |= lost_ext;
 978 }
 979
 980 #ifdef CONFIG_PPC_BOOK3S_64
 981
 982 void kvmppc_trigger_fac_interrupt(struct kvm_vcpu *vcpu, ulong fac)
 983 {
 984         /* Inject the Interrupt Cause field and trigger a guest interrupt */
 985         vcpu->arch.fscr &= ~(0xffULL << 56);
 986         vcpu->arch.fscr |= (fac << 56);
 987         kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_FAC_UNAVAIL);
 988 }
 989
 990 static void kvmppc_emulate_fac(struct kvm_vcpu *vcpu, ulong fac)
 991 {
 992         enum emulation_result er = EMULATE_FAIL;
 993
 994         if (!(kvmppc_get_msr(vcpu) & MSR_PR))
 995                 er = kvmppc_emulate_instruction(vcpu->run, vcpu);
 996
 997         if ((er != EMULATE_DONE) && (er != EMULATE_AGAIN)) {
 998                 /* Couldn't emulate, trigger interrupt in guest */
 999                 kvmppc_trigger_fac_interrupt(vcpu, fac);
1000         }
1001 }
1002
1003 /* Enable facilities (TAR, EBB, DSCR) for the guest */
1004 static int kvmppc_handle_fac(struct kvm_vcpu *vcpu, ulong fac)
1005 {
1006         bool guest_fac_enabled;
1007         BUG_ON(!cpu_has_feature(CPU_FTR_ARCH_207S));
1008
1009         /*
1010          * Not every facility is enabled by FSCR bits, check whether the
1011          * guest has this facility enabled at all.
1012          */
1013         switch (fac) {
1014         case FSCR_TAR_LG:
1015         case FSCR_EBB_LG:
1016                 guest_fac_enabled = (vcpu->arch.fscr & (1ULL << fac));
1017                 break;
1018         case FSCR_TM_LG:
1019                 guest_fac_enabled = kvmppc_get_msr(vcpu) & MSR_TM;
1020                 break;
1021         default:
1022                 guest_fac_enabled = false;
1023                 break;
1024         }
1025
1026         if (!guest_fac_enabled) {
1027                 /* Facility not enabled by the guest */
1028                 kvmppc_trigger_fac_interrupt(vcpu, fac);
1029                 return RESUME_GUEST;
1030         }
1031
1032         switch (fac) {
1033         case FSCR_TAR_LG:
1034                 /* TAR switching isn't lazy in Linux yet */
1035                 current->thread.tar = mfspr(SPRN_TAR);
1036                 mtspr(SPRN_TAR, vcpu->arch.tar);
1037                 vcpu->arch.shadow_fscr |= FSCR_TAR;
1038                 break;
1039         default:
1040                 kvmppc_emulate_fac(vcpu, fac);
1041                 break;
1042         }
1043
1044 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1045         /* Since we disabled MSR_TM at privilege state, the mfspr instruction
1046          * for TM spr can trigger TM fac unavailable. In this case, the
1047          * emulation is handled by kvmppc_emulate_fac(), which invokes
1048          * kvmppc_emulate_mfspr() finally. But note the mfspr can include
1049          * RT for NV registers. So it need to restore those NV reg to reflect
1050          * the update.
1051          */
1052         if ((fac == FSCR_TM_LG) && !(kvmppc_get_msr(vcpu) & MSR_PR))
1053                 return RESUME_GUEST_NV;
1054 #endif
1055
1056         return RESUME_GUEST;
1057 }
1058
1059 void kvmppc_set_fscr(struct kvm_vcpu *vcpu, u64 fscr)
1060 {
1061         if ((vcpu->arch.fscr & FSCR_TAR) && !(fscr & FSCR_TAR)) {
1062                 /* TAR got dropped, drop it in shadow too */
1063                 kvmppc_giveup_fac(vcpu, FSCR_TAR_LG);
1064         } else if (!(vcpu->arch.fscr & FSCR_TAR) && (fscr & FSCR_TAR)) {
1065                 vcpu->arch.fscr = fscr;
1066                 kvmppc_handle_fac(vcpu, FSCR_TAR_LG);
1067                 return;
1068         }
1069
1070         vcpu->arch.fscr = fscr;
1071 }
1072 #endif
1073
1074 static void kvmppc_setup_debug(struct kvm_vcpu *vcpu)
1075 {
1076         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {
1077                 u64 msr = kvmppc_get_msr(vcpu);
1078
1079                 kvmppc_set_msr(vcpu, msr | MSR_SE);
1080         }
1081 }
1082
1083 static void kvmppc_clear_debug(struct kvm_vcpu *vcpu)
1084 {
1085         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {
1086                 u64 msr = kvmppc_get_msr(vcpu);
1087
1088                 kvmppc_set_msr(vcpu, msr & ~MSR_SE);
1089         }
1090 }
1091
1092 static int kvmppc_exit_pr_progint(struct kvm_run *run, struct kvm_vcpu *vcpu,
1093                                   unsigned int exit_nr)
1094 {
1095         enum emulation_result er;
1096         ulong flags;
1097         u32 last_inst;
1098         int emul, r;
1099
1100         /*
1101          * shadow_srr1 only contains valid flags if we came here via a program
1102          * exception. The other exceptions (emulation assist, FP unavailable,
1103          * etc.) do not provide flags in SRR1, so use an illegal-instruction
1104          * exception when injecting a program interrupt into the guest.
1105          */
1106         if (exit_nr == BOOK3S_INTERRUPT_PROGRAM)
1107                 flags = vcpu->arch.shadow_srr1 & 0x1f0000ull;
1108         else
1109                 flags = SRR1_PROGILL;
1110
1111         emul = kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst);
1112         if (emul != EMULATE_DONE)
1113                 return RESUME_GUEST;
1114
1115         if (kvmppc_get_msr(vcpu) & MSR_PR) {
1116 #ifdef EXIT_DEBUG
1117                 pr_info("Userspace triggered 0x700 exception at\n 0x%lx (0x%x)\n",
1118                         kvmppc_get_pc(vcpu), last_inst);
1119 #endif
1120                 if ((last_inst & 0xff0007ff) != (INS_DCBZ & 0xfffffff7)) {
1121                         kvmppc_core_queue_program(vcpu, flags);
1122                         return RESUME_GUEST;
1123                 }
1124         }
1125
1126         vcpu->stat.emulated_inst_exits++;
1127         er = kvmppc_emulate_instruction(run, vcpu);
1128         switch (er) {
1129         case EMULATE_DONE:
1130                 r = RESUME_GUEST_NV;
1131                 break;
1132         case EMULATE_AGAIN:
1133                 r = RESUME_GUEST;
1134                 break;
1135         case EMULATE_FAIL:
1136                 pr_crit("%s: emulation at %lx failed (%08x)\n",
1137                         __func__, kvmppc_get_pc(vcpu), last_inst);
1138                 kvmppc_core_queue_program(vcpu, flags);
1139                 r = RESUME_GUEST;
1140                 break;
1141         case EMULATE_DO_MMIO:
1142                 run->exit_reason = KVM_EXIT_MMIO;
1143                 r = RESUME_HOST_NV;
1144                 break;
1145         case EMULATE_EXIT_USER:
1146                 r = RESUME_HOST_NV;
1147                 break;
1148         default:
1149                 BUG();
1150         }
1151
1152         return r;
1153 }
1154
1155 int kvmppc_handle_exit_pr(struct kvm_run *run, struct kvm_vcpu *vcpu,
1156                           unsigned int exit_nr)
1157 {
1158         int r = RESUME_HOST;
1159         int s;
1160
1161         vcpu->stat.sum_exits++;
1162
1163         run->exit_reason = KVM_EXIT_UNKNOWN;
1164         run->ready_for_interrupt_injection = 1;
1165
1166         /* We get here with MSR.EE=1 */
1167
1168         trace_kvm_exit(exit_nr, vcpu);
1169         guest_exit();
1170
1171         switch (exit_nr) {
1172         case BOOK3S_INTERRUPT_INST_STORAGE:
1173         {
1174                 ulong shadow_srr1 = vcpu->arch.shadow_srr1;
1175                 vcpu->stat.pf_instruc++;
1176
1177                 if (kvmppc_is_split_real(vcpu))
1178                         kvmppc_fixup_split_real(vcpu);
1179
1180 #ifdef CONFIG_PPC_BOOK3S_32
1181                 /* We set segments as unused segments when invalidating them. So
1182                  * treat the respective fault as segment fault. */
1183                 {
1184                         struct kvmppc_book3s_shadow_vcpu *svcpu;
1185                         u32 sr;
1186
1187                         svcpu = svcpu_get(vcpu);
1188                         sr = svcpu->sr[kvmppc_get_pc(vcpu) >> SID_SHIFT];
1189                         svcpu_put(svcpu);
1190                         if (sr == SR_INVALID) {
1191                                 kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
1192                                 r = RESUME_GUEST;
1193                                 break;
1194                         }
1195                 }
1196 #endif
1197
1198                 /* only care about PTEG not found errors, but leave NX alone */
1199                 if (shadow_srr1 & 0x40000000) {
1200                         int idx = srcu_read_lock(&vcpu->kvm->srcu);
1201                         r = kvmppc_handle_pagefault(run, vcpu, kvmppc_get_pc(vcpu), exit_nr);
1202                         srcu_read_unlock(&vcpu->kvm->srcu, idx);
1203                         vcpu->stat.sp_instruc++;
1204                 } else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
1205                           (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
1206                         /*
1207                          * XXX If we do the dcbz hack we use the NX bit to flush&patch the page,
1208                          *     so we can't use the NX bit inside the guest. Let's cross our fingers,
1209                          *     that no guest that needs the dcbz hack does NX.
1210                          */
1211                         kvmppc_mmu_pte_flush(vcpu, kvmppc_get_pc(vcpu), ~0xFFFUL);
1212                         r = RESUME_GUEST;
1213                 } else {
1214                         kvmppc_core_queue_inst_storage(vcpu,
1215                                                 shadow_srr1 & 0x58000000);
1216                         r = RESUME_GUEST;
1217                 }
1218                 break;
1219         }
1220         case BOOK3S_INTERRUPT_DATA_STORAGE:
1221         {
1222                 ulong dar = kvmppc_get_fault_dar(vcpu);
1223                 u32 fault_dsisr = vcpu->arch.fault_dsisr;
1224                 vcpu->stat.pf_storage++;
1225
1226 #ifdef CONFIG_PPC_BOOK3S_32
1227                 /* We set segments as unused segments when invalidating them. So
1228                  * treat the respective fault as segment fault. */
1229                 {
1230                         struct kvmppc_book3s_shadow_vcpu *svcpu;
1231                         u32 sr;
1232
1233                         svcpu = svcpu_get(vcpu);
1234                         sr = svcpu->sr[dar >> SID_SHIFT];
1235                         svcpu_put(svcpu);
1236                         if (sr == SR_INVALID) {
1237                                 kvmppc_mmu_map_segment(vcpu, dar);
1238                                 r = RESUME_GUEST;
1239                                 break;
1240                         }
1241                 }
1242 #endif
1243
1244                 /*
1245                  * We need to handle missing shadow PTEs, and
1246                  * protection faults due to us mapping a page read-only
1247                  * when the guest thinks it is writable.
1248                  */
1249                 if (fault_dsisr & (DSISR_NOHPTE | DSISR_PROTFAULT)) {
1250                         int idx = srcu_read_lock(&vcpu->kvm->srcu);
1251                         r = kvmppc_handle_pagefault(run, vcpu, dar, exit_nr);
1252                         srcu_read_unlock(&vcpu->kvm->srcu, idx);
1253                 } else {
1254                         kvmppc_core_queue_data_storage(vcpu, dar, fault_dsisr);
1255                         r = RESUME_GUEST;
1256                 }
1257                 break;
1258         }
1259         case BOOK3S_INTERRUPT_DATA_SEGMENT:
1260                 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_fault_dar(vcpu)) < 0) {
1261                         kvmppc_set_dar(vcpu, kvmppc_get_fault_dar(vcpu));
1262                         kvmppc_book3s_queue_irqprio(vcpu,
1263                                 BOOK3S_INTERRUPT_DATA_SEGMENT);
1264                 }
1265                 r = RESUME_GUEST;
1266                 break;
1267         case BOOK3S_INTERRUPT_INST_SEGMENT:
1268                 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu)) < 0) {
1269                         kvmppc_book3s_queue_irqprio(vcpu,
1270                                 BOOK3S_INTERRUPT_INST_SEGMENT);
1271                 }
1272                 r = RESUME_GUEST;
1273                 break;
1274         /* We're good on these - the host merely wanted to get our attention */
1275         case BOOK3S_INTERRUPT_DECREMENTER:
1276         case BOOK3S_INTERRUPT_HV_DECREMENTER:
1277         case BOOK3S_INTERRUPT_DOORBELL:
1278         case BOOK3S_INTERRUPT_H_DOORBELL:
1279                 vcpu->stat.dec_exits++;
1280                 r = RESUME_GUEST;
1281                 break;
1282         case BOOK3S_INTERRUPT_EXTERNAL:
1283         case BOOK3S_INTERRUPT_EXTERNAL_HV:
1284         case BOOK3S_INTERRUPT_H_VIRT:
1285                 vcpu->stat.ext_intr_exits++;
1286                 r = RESUME_GUEST;
1287                 break;
1288         case BOOK3S_INTERRUPT_HMI:
1289         case BOOK3S_INTERRUPT_PERFMON:
1290         case BOOK3S_INTERRUPT_SYSTEM_RESET:
1291                 r = RESUME_GUEST;
1292                 break;
1293         case BOOK3S_INTERRUPT_PROGRAM:
1294         case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
1295                 r = kvmppc_exit_pr_progint(run, vcpu, exit_nr);
1296                 break;
1297         case BOOK3S_INTERRUPT_SYSCALL:
1298         {
1299                 u32 last_sc;
1300                 int emul;
1301
1302                 /* Get last sc for papr */
1303                 if (vcpu->arch.papr_enabled) {
1304                         /* The sc instuction points SRR0 to the next inst */
1305                         emul = kvmppc_get_last_inst(vcpu, INST_SC, &last_sc);
1306                         if (emul != EMULATE_DONE) {
1307                                 kvmppc_set_pc(vcpu, kvmppc_get_pc(vcpu) - 4);
1308                                 r = RESUME_GUEST;
1309                                 break;
1310                         }
1311                 }
1312
1313                 if (vcpu->arch.papr_enabled &&
1314                     (last_sc == 0x44000022) &&
1315                     !(kvmppc_get_msr(vcpu) & MSR_PR)) {
1316                         /* SC 1 papr hypercalls */
1317                         ulong cmd = kvmppc_get_gpr(vcpu, 3);
1318                         int i;
1319
1320 #ifdef CONFIG_PPC_BOOK3S_64
1321                         if (kvmppc_h_pr(vcpu, cmd) == EMULATE_DONE) {
1322                                 r = RESUME_GUEST;
1323                                 break;
1324                         }
1325 #endif
1326
1327                         run->papr_hcall.nr = cmd;
1328                         for (i = 0; i < 9; ++i) {
1329                                 ulong gpr = kvmppc_get_gpr(vcpu, 4 + i);
1330                                 run->papr_hcall.args[i] = gpr;
1331                         }
1332                         run->exit_reason = KVM_EXIT_PAPR_HCALL;
1333                         vcpu->arch.hcall_needed = 1;
1334                         r = RESUME_HOST;
1335                 } else if (vcpu->arch.osi_enabled &&
1336                     (((u32)kvmppc_get_gpr(vcpu, 3)) == OSI_SC_MAGIC_R3) &&
1337                     (((u32)kvmppc_get_gpr(vcpu, 4)) == OSI_SC_MAGIC_R4)) {
1338                         /* MOL hypercalls */
1339                         u64 *gprs = run->osi.gprs;
1340                         int i;
1341
1342                         run->exit_reason = KVM_EXIT_OSI;
1343                         for (i = 0; i < 32; i++)
1344                                 gprs[i] = kvmppc_get_gpr(vcpu, i);
1345                         vcpu->arch.osi_needed = 1;
1346                         r = RESUME_HOST_NV;
1347                 } else if (!(kvmppc_get_msr(vcpu) & MSR_PR) &&
1348                     (((u32)kvmppc_get_gpr(vcpu, 0)) == KVM_SC_MAGIC_R0)) {
1349                         /* KVM PV hypercalls */
1350                         kvmppc_set_gpr(vcpu, 3, kvmppc_kvm_pv(vcpu));
1351                         r = RESUME_GUEST;
1352                 } else {
1353                         /* Guest syscalls */
1354                         vcpu->stat.syscall_exits++;
1355                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
1356                         r = RESUME_GUEST;
1357                 }
1358                 break;
1359         }
1360         case BOOK3S_INTERRUPT_FP_UNAVAIL:
1361         case BOOK3S_INTERRUPT_ALTIVEC:
1362         case BOOK3S_INTERRUPT_VSX:
1363         {
1364                 int ext_msr = 0;
1365                 int emul;
1366                 u32 last_inst;
1367
1368                 if (vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE) {
1369                         /* Do paired single instruction emulation */
1370                         emul = kvmppc_get_last_inst(vcpu, INST_GENERIC,
1371                                                     &last_inst);
1372                         if (emul == EMULATE_DONE)
1373                                 r = kvmppc_exit_pr_progint(run, vcpu, exit_nr);
1374                         else
1375                                 r = RESUME_GUEST;
1376
1377                         break;
1378                 }
1379
1380                 /* Enable external provider */
1381                 switch (exit_nr) {
1382                 case BOOK3S_INTERRUPT_FP_UNAVAIL:
1383                         ext_msr = MSR_FP;
1384                         break;
1385
1386                 case BOOK3S_INTERRUPT_ALTIVEC:
1387                         ext_msr = MSR_VEC;
1388                         break;
1389
1390                 case BOOK3S_INTERRUPT_VSX:
1391                         ext_msr = MSR_VSX;
1392                         break;
1393                 }
1394
1395                 r = kvmppc_handle_ext(vcpu, exit_nr, ext_msr);
1396                 break;
1397         }
1398         case BOOK3S_INTERRUPT_ALIGNMENT:
1399         {
1400                 u32 last_inst;
1401                 int emul = kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst);
1402
1403                 if (emul == EMULATE_DONE) {
1404                         u32 dsisr;
1405                         u64 dar;
1406
1407                         dsisr = kvmppc_alignment_dsisr(vcpu, last_inst);
1408                         dar = kvmppc_alignment_dar(vcpu, last_inst);
1409
1410                         kvmppc_set_dsisr(vcpu, dsisr);
1411                         kvmppc_set_dar(vcpu, dar);
1412
1413                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
1414                 }
1415                 r = RESUME_GUEST;
1416                 break;
1417         }
1418 #ifdef CONFIG_PPC_BOOK3S_64
1419         case BOOK3S_INTERRUPT_FAC_UNAVAIL:
1420                 r = kvmppc_handle_fac(vcpu, vcpu->arch.shadow_fscr >> 56);
1421                 break;
1422 #endif
1423         case BOOK3S_INTERRUPT_MACHINE_CHECK:
1424                 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
1425                 r = RESUME_GUEST;
1426                 break;
1427         case BOOK3S_INTERRUPT_TRACE:
1428                 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {
1429                         run->exit_reason = KVM_EXIT_DEBUG;
1430                         r = RESUME_HOST;
1431                 } else {
1432                         kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
1433                         r = RESUME_GUEST;
1434                 }
1435                 break;
1436         default:
1437         {
1438                 ulong shadow_srr1 = vcpu->arch.shadow_srr1;
1439                 /* Ugh - bork here! What did we get? */
1440                 printk(KERN_EMERG "exit_nr=0x%x | pc=0x%lx | msr=0x%lx\n",
1441                         exit_nr, kvmppc_get_pc(vcpu), shadow_srr1);
1442                 r = RESUME_HOST;
1443                 BUG();
1444                 break;
1445         }
1446         }
1447
1448         if (!(r & RESUME_HOST)) {
1449                 /* To avoid clobbering exit_reason, only check for signals if
1450                  * we aren't already exiting to userspace for some other
1451                  * reason. */
1452
1453                 /*
1454                  * Interrupts could be timers for the guest which we have to
1455                  * inject again, so let's postpone them until we're in the guest
1456                  * and if we really did time things so badly, then we just exit
1457                  * again due to a host external interrupt.
1458                  */
1459                 s = kvmppc_prepare_to_enter(vcpu);
1460                 if (s <= 0)
1461                         r = s;
1462                 else {
1463                         /* interrupts now hard-disabled */
1464                         kvmppc_fix_ee_before_entry();
1465                 }
1466
1467                 kvmppc_handle_lost_ext(vcpu);
1468         }
1469
1470         trace_kvm_book3s_reenter(r, vcpu);
1471
1472         return r;
1473 }
1474
1475 static int kvm_arch_vcpu_ioctl_get_sregs_pr(struct kvm_vcpu *vcpu,
1476                                             struct kvm_sregs *sregs)
1477 {
1478         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
1479         int i;
1480
1481         sregs->pvr = vcpu->arch.pvr;
1482
1483         sregs->u.s.sdr1 = to_book3s(vcpu)->sdr1;
1484         if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) {
1485                 for (i = 0; i < 64; i++) {
1486                         sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige | i;
1487                         sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
1488                 }
1489         } else {
1490                 for (i = 0; i < 16; i++)
1491                         sregs->u.s.ppc32.sr[i] = kvmppc_get_sr(vcpu, i);
1492
1493                 for (i = 0; i < 8; i++) {
1494                         sregs->u.s.ppc32.ibat[i] = vcpu3s->ibat[i].raw;
1495                         sregs->u.s.ppc32.dbat[i] = vcpu3s->dbat[i].raw;
1496                 }
1497         }
1498
1499         return 0;
1500 }
1501
1502 static int kvm_arch_vcpu_ioctl_set_sregs_pr(struct kvm_vcpu *vcpu,
1503                                             struct kvm_sregs *sregs)
1504 {
1505         struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
1506         int i;
1507
1508         kvmppc_set_pvr_pr(vcpu, sregs->pvr);
1509
1510         vcpu3s->sdr1 = sregs->u.s.sdr1;
1511 #ifdef CONFIG_PPC_BOOK3S_64
1512         if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) {
1513                 /* Flush all SLB entries */
1514                 vcpu->arch.mmu.slbmte(vcpu, 0, 0);
1515                 vcpu->arch.mmu.slbia(vcpu);
1516
1517                 for (i = 0; i < 64; i++) {
1518                         u64 rb = sregs->u.s.ppc64.slb[i].slbe;
1519                         u64 rs = sregs->u.s.ppc64.slb[i].slbv;
1520
1521                         if (rb & SLB_ESID_V)
1522                                 vcpu->arch.mmu.slbmte(vcpu, rs, rb);
1523                 }
1524         } else
1525 #endif
1526         {
1527                 for (i = 0; i < 16; i++) {
1528                         vcpu->arch.mmu.mtsrin(vcpu, i, sregs->u.s.ppc32.sr[i]);
1529                 }
1530                 for (i = 0; i < 8; i++) {
1531                         kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), false,
1532                                        (u32)sregs->u.s.ppc32.ibat[i]);
1533                         kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), true,
1534                                        (u32)(sregs->u.s.ppc32.ibat[i] >> 32));
1535                         kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), false,
1536                                        (u32)sregs->u.s.ppc32.dbat[i]);
1537                         kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), true,
1538                                        (u32)(sregs->u.s.ppc32.dbat[i] >> 32));
1539                 }
1540         }
1541
1542         /* Flush the MMU after messing with the segments */
1543         kvmppc_mmu_pte_flush(vcpu, 0, 0);
1544
1545         return 0;
1546 }
1547
1548 static int kvmppc_get_one_reg_pr(struct kvm_vcpu *vcpu, u64 id,
1549                                  union kvmppc_one_reg *val)
1550 {
1551         int r = 0;
1552
1553         switch (id) {
1554         case KVM_REG_PPC_DEBUG_INST:
1555                 *val = get_reg_val(id, KVMPPC_INST_SW_BREAKPOINT);
1556                 break;
1557         case KVM_REG_PPC_HIOR:
1558                 *val = get_reg_val(id, to_book3s(vcpu)->hior);
1559                 break;
1560         case KVM_REG_PPC_VTB:
1561                 *val = get_reg_val(id, to_book3s(vcpu)->vtb);
1562                 break;
1563         case KVM_REG_PPC_LPCR:
1564         case KVM_REG_PPC_LPCR_64:
1565                 /*
1566                  * We are only interested in the LPCR_ILE bit
1567                  */
1568                 if (vcpu->arch.intr_msr & MSR_LE)
1569                         *val = get_reg_val(id, LPCR_ILE);
1570                 else
1571                         *val = get_reg_val(id, 0);
1572                 break;
1573 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1574         case KVM_REG_PPC_TFHAR:
1575                 *val = get_reg_val(id, vcpu->arch.tfhar);
1576                 break;
1577         case KVM_REG_PPC_TFIAR:
1578                 *val = get_reg_val(id, vcpu->arch.tfiar);
1579                 break;
1580         case KVM_REG_PPC_TEXASR:
1581                 *val = get_reg_val(id, vcpu->arch.texasr);
1582                 break;
1583         case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31:
1584                 *val = get_reg_val(id,
1585                                 vcpu->arch.gpr_tm[id-KVM_REG_PPC_TM_GPR0]);
1586                 break;
1587         case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63:
1588         {
1589                 int i, j;
1590
1591                 i = id - KVM_REG_PPC_TM_VSR0;
1592                 if (i < 32)
1593                         for (j = 0; j < TS_FPRWIDTH; j++)
1594                                 val->vsxval[j] = vcpu->arch.fp_tm.fpr[i][j];
1595                 else {
1596                         if (cpu_has_feature(CPU_FTR_ALTIVEC))
1597                                 val->vval = vcpu->arch.vr_tm.vr[i-32];
1598                         else
1599                                 r = -ENXIO;
1600                 }
1601                 break;
1602         }
1603         case KVM_REG_PPC_TM_CR:
1604                 *val = get_reg_val(id, vcpu->arch.cr_tm);
1605                 break;
1606         case KVM_REG_PPC_TM_XER:
1607                 *val = get_reg_val(id, vcpu->arch.xer_tm);
1608                 break;
1609         case KVM_REG_PPC_TM_LR:
1610                 *val = get_reg_val(id, vcpu->arch.lr_tm);
1611                 break;
1612         case KVM_REG_PPC_TM_CTR:
1613                 *val = get_reg_val(id, vcpu->arch.ctr_tm);
1614                 break;
1615         case KVM_REG_PPC_TM_FPSCR:
1616                 *val = get_reg_val(id, vcpu->arch.fp_tm.fpscr);
1617                 break;
1618         case KVM_REG_PPC_TM_AMR:
1619                 *val = get_reg_val(id, vcpu->arch.amr_tm);
1620                 break;
1621         case KVM_REG_PPC_TM_PPR:
1622                 *val = get_reg_val(id, vcpu->arch.ppr_tm);
1623                 break;
1624         case KVM_REG_PPC_TM_VRSAVE:
1625                 *val = get_reg_val(id, vcpu->arch.vrsave_tm);
1626                 break;
1627         case KVM_REG_PPC_TM_VSCR:
1628                 if (cpu_has_feature(CPU_FTR_ALTIVEC))
1629                         *val = get_reg_val(id, vcpu->arch.vr_tm.vscr.u[3]);
1630                 else
1631                         r = -ENXIO;
1632                 break;
1633         case KVM_REG_PPC_TM_DSCR:
1634                 *val = get_reg_val(id, vcpu->arch.dscr_tm);
1635                 break;
1636         case KVM_REG_PPC_TM_TAR:
1637                 *val = get_reg_val(id, vcpu->arch.tar_tm);
1638                 break;
1639 #endif
1640         default:
1641                 r = -EINVAL;
1642                 break;
1643         }
1644
1645         return r;
1646 }
1647
1648 static void kvmppc_set_lpcr_pr(struct kvm_vcpu *vcpu, u64 new_lpcr)
1649 {
1650         if (new_lpcr & LPCR_ILE)
1651                 vcpu->arch.intr_msr |= MSR_LE;
1652         else
1653                 vcpu->arch.intr_msr &= ~MSR_LE;
1654 }
1655
1656 static int kvmppc_set_one_reg_pr(struct kvm_vcpu *vcpu, u64 id,
1657                                  union kvmppc_one_reg *val)
1658 {
1659         int r = 0;
1660
1661         switch (id) {
1662         case KVM_REG_PPC_HIOR:
1663                 to_book3s(vcpu)->hior = set_reg_val(id, *val);
1664                 to_book3s(vcpu)->hior_explicit = true;
1665                 break;
1666         case KVM_REG_PPC_VTB:
1667                 to_book3s(vcpu)->vtb = set_reg_val(id, *val);
1668                 break;
1669         case KVM_REG_PPC_LPCR:
1670         case KVM_REG_PPC_LPCR_64:
1671                 kvmppc_set_lpcr_pr(vcpu, set_reg_val(id, *val));
1672                 break;
1673 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
1674         case KVM_REG_PPC_TFHAR:
1675                 vcpu->arch.tfhar = set_reg_val(id, *val);
1676                 break;
1677         case KVM_REG_PPC_TFIAR:
1678                 vcpu->arch.tfiar = set_reg_val(id, *val);
1679                 break;
1680         case KVM_REG_PPC_TEXASR:
1681                 vcpu->arch.texasr = set_reg_val(id, *val);
1682                 break;
1683         case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31:
1684                 vcpu->arch.gpr_tm[id - KVM_REG_PPC_TM_GPR0] =
1685                         set_reg_val(id, *val);
1686                 break;
1687         case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63:
1688         {
1689                 int i, j;
1690
1691                 i = id - KVM_REG_PPC_TM_VSR0;
1692                 if (i < 32)
1693                         for (j = 0; j < TS_FPRWIDTH; j++)
1694                                 vcpu->arch.fp_tm.fpr[i][j] = val->vsxval[j];
1695                 else
1696                         if (cpu_has_feature(CPU_FTR_ALTIVEC))
1697                                 vcpu->arch.vr_tm.vr[i-32] = val->vval;
1698                         else
1699                                 r = -ENXIO;
1700                 break;
1701         }
1702         case KVM_REG_PPC_TM_CR:
1703                 vcpu->arch.cr_tm = set_reg_val(id, *val);
1704                 break;
1705         case KVM_REG_PPC_TM_XER:
1706                 vcpu->arch.xer_tm = set_reg_val(id, *val);
1707                 break;
1708         case KVM_REG_PPC_TM_LR:
1709                 vcpu->arch.lr_tm = set_reg_val(id, *val);
1710                 break;
1711         case KVM_REG_PPC_TM_CTR:
1712                 vcpu->arch.ctr_tm = set_reg_val(id, *val);
1713                 break;
1714         case KVM_REG_PPC_TM_FPSCR:
1715                 vcpu->arch.fp_tm.fpscr = set_reg_val(id, *val);
1716                 break;
1717         case KVM_REG_PPC_TM_AMR:
1718                 vcpu->arch.amr_tm = set_reg_val(id, *val);
1719                 break;
1720         case KVM_REG_PPC_TM_PPR:
1721                 vcpu->arch.ppr_tm = set_reg_val(id, *val);
1722                 break;
1723         case KVM_REG_PPC_TM_VRSAVE:
1724                 vcpu->arch.vrsave_tm = set_reg_val(id, *val);
1725                 break;
1726         case KVM_REG_PPC_TM_VSCR:
1727                 if (cpu_has_feature(CPU_FTR_ALTIVEC))
1728                         vcpu->arch.vr.vscr.u[3] = set_reg_val(id, *val);
1729                 else
1730                         r = -ENXIO;
1731                 break;
1732         case KVM_REG_PPC_TM_DSCR:
1733                 vcpu->arch.dscr_tm = set_reg_val(id, *val);
1734                 break;
1735         case KVM_REG_PPC_TM_TAR:
1736                 vcpu->arch.tar_tm = set_reg_val(id, *val);
1737                 break;
1738 #endif
1739         default:
1740                 r = -EINVAL;
1741                 break;
1742         }
1743
1744         return r;
1745 }
1746
1747 static int kvmppc_core_vcpu_create_pr(struct kvm_vcpu *vcpu)
1748 {
1749         struct kvmppc_vcpu_book3s *vcpu_book3s;
1750         unsigned long p;
1751         int err;
1752
1753         err = -ENOMEM;
1754
1755         vcpu_book3s = vzalloc(sizeof(struct kvmppc_vcpu_book3s));
1756         if (!vcpu_book3s)
1757                 goto out;
1758         vcpu->arch.book3s = vcpu_book3s;
1759
1760 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER
1761         vcpu->arch.shadow_vcpu =
1762                 kzalloc(sizeof(*vcpu->arch.shadow_vcpu), GFP_KERNEL);
1763         if (!vcpu->arch.shadow_vcpu)
1764                 goto free_vcpu3s;
1765 #endif
1766
1767         p = __get_free_page(GFP_KERNEL|__GFP_ZERO);
1768         if (!p)
1769                 goto free_shadow_vcpu;
1770         vcpu->arch.shared = (void *)p;
1771 #ifdef CONFIG_PPC_BOOK3S_64
1772         /* Always start the shared struct in native endian mode */
1773 #ifdef __BIG_ENDIAN__
1774         vcpu->arch.shared_big_endian = true;
1775 #else
1776         vcpu->arch.shared_big_endian = false;
1777 #endif
1778
1779         /*
1780          * Default to the same as the host if we're on sufficiently
1781          * recent machine that we have 1TB segments;
1782          * otherwise default to PPC970FX.
1783          */
1784         vcpu->arch.pvr = 0x3C0301;
1785         if (mmu_has_feature(MMU_FTR_1T_SEGMENT))
1786                 vcpu->arch.pvr = mfspr(SPRN_PVR);
1787         vcpu->arch.intr_msr = MSR_SF;
1788 #else
1789         /* default to book3s_32 (750) */
1790         vcpu->arch.pvr = 0x84202;
1791         vcpu->arch.intr_msr = 0;
1792 #endif
1793         kvmppc_set_pvr_pr(vcpu, vcpu->arch.pvr);
1794         vcpu->arch.slb_nr = 64;
1795
1796         vcpu->arch.shadow_msr = MSR_USER64 & ~MSR_LE;
1797
1798         err = kvmppc_mmu_init(vcpu);
1799         if (err < 0)
1800                 goto free_shared_page;
1801
1802         return 0;
1803
1804 free_shared_page:
1805         free_page((unsigned long)vcpu->arch.shared);
1806 free_shadow_vcpu:
1807 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER
1808         kfree(vcpu->arch.shadow_vcpu);
1809 free_vcpu3s:
1810 #endif
1811         vfree(vcpu_book3s);
1812 out:
1813         return err;
1814 }
1815
1816 static void kvmppc_core_vcpu_free_pr(struct kvm_vcpu *vcpu)
1817 {
1818         struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
1819
1820         free_page((unsigned long)vcpu->arch.shared & PAGE_MASK);
1821 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER
1822         kfree(vcpu->arch.shadow_vcpu);
1823 #endif
1824         vfree(vcpu_book3s);
1825 }
1826
1827 static int kvmppc_vcpu_run_pr(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
1828 {
1829         int ret;
1830 #ifdef CONFIG_ALTIVEC
1831         unsigned long uninitialized_var(vrsave);
1832 #endif
1833
1834         /* Check if we can run the vcpu at all */
1835         if (!vcpu->arch.sane) {
1836                 kvm_run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1837                 ret = -EINVAL;
1838                 goto out;
1839         }
1840
1841         kvmppc_setup_debug(vcpu);
1842
1843         /*
1844          * Interrupts could be timers for the guest which we have to inject
1845          * again, so let's postpone them until we're in the guest and if we
1846          * really did time things so badly, then we just exit again due to
1847          * a host external interrupt.
1848          */
1849         ret = kvmppc_prepare_to_enter(vcpu);
1850         if (ret <= 0)
1851                 goto out;
1852         /* interrupts now hard-disabled */
1853
1854         /* Save FPU, Altivec and VSX state */
1855         giveup_all(current);
1856
1857         /* Preload FPU if it's enabled */
1858         if (kvmppc_get_msr(vcpu) & MSR_FP)
1859                 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
1860
1861         kvmppc_fix_ee_before_entry();
1862
1863         ret = __kvmppc_vcpu_run(kvm_run, vcpu);
1864
1865         kvmppc_clear_debug(vcpu);
1866
1867         /* No need for guest_exit. It's done in handle_exit.
1868            We also get here with interrupts enabled. */
1869
1870         /* Make sure we save the guest FPU/Altivec/VSX state */
1871         kvmppc_giveup_ext(vcpu, MSR_FP | MSR_VEC | MSR_VSX);
1872
1873         /* Make sure we save the guest TAR/EBB/DSCR state */
1874         kvmppc_giveup_fac(vcpu, FSCR_TAR_LG);
1875
1876 out:
1877         vcpu->mode = OUTSIDE_GUEST_MODE;
1878         return ret;
1879 }
1880
1881 /*
1882  * Get (and clear) the dirty memory log for a memory slot.
1883  */
1884 static int kvm_vm_ioctl_get_dirty_log_pr(struct kvm *kvm,
1885                                          struct kvm_dirty_log *log)
1886 {
1887         struct kvm_memslots *slots;
1888         struct kvm_memory_slot *memslot;
1889         struct kvm_vcpu *vcpu;
1890         ulong ga, ga_end;
1891         int is_dirty = 0;
1892         int r;
1893         unsigned long n;
1894
1895         mutex_lock(&kvm->slots_lock);
1896
1897         r = kvm_get_dirty_log(kvm, log, &is_dirty);
1898         if (r)
1899                 goto out;
1900
1901         /* If nothing is dirty, don't bother messing with page tables. */
1902         if (is_dirty) {
1903                 slots = kvm_memslots(kvm);
1904                 memslot = id_to_memslot(slots, log->slot);
1905
1906                 ga = memslot->base_gfn << PAGE_SHIFT;
1907                 ga_end = ga + (memslot->npages << PAGE_SHIFT);
1908
1909                 kvm_for_each_vcpu(n, vcpu, kvm)
1910                         kvmppc_mmu_pte_pflush(vcpu, ga, ga_end);
1911
1912                 n = kvm_dirty_bitmap_bytes(memslot);
1913                 memset(memslot->dirty_bitmap, 0, n);
1914         }
1915
1916         r = 0;
1917 out:
1918         mutex_unlock(&kvm->slots_lock);
1919         return r;
1920 }
1921
1922 static void kvmppc_core_flush_memslot_pr(struct kvm *kvm,
1923                                          struct kvm_memory_slot *memslot)
1924 {
1925         return;
1926 }
1927
1928 static int kvmppc_core_prepare_memory_region_pr(struct kvm *kvm,
1929                                         struct kvm_memory_slot *memslot,
1930                                         const struct kvm_userspace_memory_region *mem)
1931 {
1932         return 0;
1933 }
1934
1935 static void kvmppc_core_commit_memory_region_pr(struct kvm *kvm,
1936                                 const struct kvm_userspace_memory_region *mem,
1937                                 const struct kvm_memory_slot *old,
1938                                 const struct kvm_memory_slot *new,
1939                                 enum kvm_mr_change change)
1940 {
1941         return;
1942 }
1943
1944 static void kvmppc_core_free_memslot_pr(struct kvm_memory_slot *free,
1945                                         struct kvm_memory_slot *dont)
1946 {
1947         return;
1948 }
1949
1950 static int kvmppc_core_create_memslot_pr(struct kvm_memory_slot *slot,
1951                                          unsigned long npages)
1952 {
1953         return 0;
1954 }
1955
1956
1957 #ifdef CONFIG_PPC64
1958 static int kvm_vm_ioctl_get_smmu_info_pr(struct kvm *kvm,
1959                                          struct kvm_ppc_smmu_info *info)
1960 {
1961         long int i;
1962         struct kvm_vcpu *vcpu;
1963
1964         info->flags = 0;
1965
1966         /* SLB is always 64 entries */
1967         info->slb_size = 64;
1968
1969         /* Standard 4k base page size segment */
1970         info->sps[0].page_shift = 12;
1971         info->sps[0].slb_enc = 0;
1972         info->sps[0].enc[0].page_shift = 12;
1973         info->sps[0].enc[0].pte_enc = 0;
1974
1975         /*
1976          * 64k large page size.
1977          * We only want to put this in if the CPUs we're emulating
1978          * support it, but unfortunately we don't have a vcpu easily
1979          * to hand here to test.  Just pick the first vcpu, and if
1980          * that doesn't exist yet, report the minimum capability,
1981          * i.e., no 64k pages.
1982          * 1T segment support goes along with 64k pages.
1983          */
1984         i = 1;
1985         vcpu = kvm_get_vcpu(kvm, 0);
1986         if (vcpu && (vcpu->arch.hflags & BOOK3S_HFLAG_MULTI_PGSIZE)) {
1987                 info->flags = KVM_PPC_1T_SEGMENTS;
1988                 info->sps[i].page_shift = 16;
1989                 info->sps[i].slb_enc = SLB_VSID_L | SLB_VSID_LP_01;
1990                 info->sps[i].enc[0].page_shift = 16;
1991                 info->sps[i].enc[0].pte_enc = 1;
1992                 ++i;
1993         }
1994
1995         /* Standard 16M large page size segment */
1996         info->sps[i].page_shift = 24;
1997         info->sps[i].slb_enc = SLB_VSID_L;
1998         info->sps[i].enc[0].page_shift = 24;
1999         info->sps[i].enc[0].pte_enc = 0;
2000
2001         return 0;
2002 }
2003
2004 static int kvm_configure_mmu_pr(struct kvm *kvm, struct kvm_ppc_mmuv3_cfg *cfg)
2005 {
2006         if (!cpu_has_feature(CPU_FTR_ARCH_300))
2007                 return -ENODEV;
2008         /* Require flags and process table base and size to all be zero. */
2009         if (cfg->flags || cfg->process_table)
2010                 return -EINVAL;
2011         return 0;
2012 }
2013
2014 #else
2015 static int kvm_vm_ioctl_get_smmu_info_pr(struct kvm *kvm,
2016                                          struct kvm_ppc_smmu_info *info)
2017 {
2018         /* We should not get called */
2019         BUG();
2020         return 0;
2021 }
2022 #endif /* CONFIG_PPC64 */
2023
2024 static unsigned int kvm_global_user_count = 0;
2025 static DEFINE_SPINLOCK(kvm_global_user_count_lock);
2026
2027 static int kvmppc_core_init_vm_pr(struct kvm *kvm)
2028 {
2029         mutex_init(&kvm->arch.hpt_mutex);
2030
2031 #ifdef CONFIG_PPC_BOOK3S_64
2032         /* Start out with the default set of hcalls enabled */
2033         kvmppc_pr_init_default_hcalls(kvm);
2034 #endif
2035
2036         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
2037                 spin_lock(&kvm_global_user_count_lock);
2038                 if (++kvm_global_user_count == 1)
2039                         pseries_disable_reloc_on_exc();
2040                 spin_unlock(&kvm_global_user_count_lock);
2041         }
2042         return 0;
2043 }
2044
2045 static void kvmppc_core_destroy_vm_pr(struct kvm *kvm)
2046 {
2047 #ifdef CONFIG_PPC64
2048         WARN_ON(!list_empty(&kvm->arch.spapr_tce_tables));
2049 #endif
2050
2051         if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
2052                 spin_lock(&kvm_global_user_count_lock);
2053                 BUG_ON(kvm_global_user_count == 0);
2054                 if (--kvm_global_user_count == 0)
2055                         pseries_enable_reloc_on_exc();
2056                 spin_unlock(&kvm_global_user_count_lock);
2057         }
2058 }
2059
2060 static int kvmppc_core_check_processor_compat_pr(void)
2061 {
2062         /*
2063          * PR KVM can work on POWER9 inside a guest partition
2064          * running in HPT mode.  It can't work if we are using
2065          * radix translation (because radix provides no way for
2066          * a process to have unique translations in quadrant 3).
2067          */
2068         if (cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled())
2069                 return -EIO;
2070         return 0;
2071 }
2072
2073 static long kvm_arch_vm_ioctl_pr(struct file *filp,
2074                                  unsigned int ioctl, unsigned long arg)
2075 {
2076         return -ENOTTY;
2077 }
2078
2079 static struct kvmppc_ops kvm_ops_pr = {
2080         .get_sregs = kvm_arch_vcpu_ioctl_get_sregs_pr,
2081         .set_sregs = kvm_arch_vcpu_ioctl_set_sregs_pr,
2082         .get_one_reg = kvmppc_get_one_reg_pr,
2083         .set_one_reg = kvmppc_set_one_reg_pr,
2084         .vcpu_load   = kvmppc_core_vcpu_load_pr,
2085         .vcpu_put    = kvmppc_core_vcpu_put_pr,
2086         .inject_interrupt = kvmppc_inject_interrupt_pr,
2087         .set_msr     = kvmppc_set_msr_pr,
2088         .vcpu_run    = kvmppc_vcpu_run_pr,
2089         .vcpu_create = kvmppc_core_vcpu_create_pr,
2090         .vcpu_free   = kvmppc_core_vcpu_free_pr,
2091         .check_requests = kvmppc_core_check_requests_pr,
2092         .get_dirty_log = kvm_vm_ioctl_get_dirty_log_pr,
2093         .flush_memslot = kvmppc_core_flush_memslot_pr,
2094         .prepare_memory_region = kvmppc_core_prepare_memory_region_pr,
2095         .commit_memory_region = kvmppc_core_commit_memory_region_pr,
2096         .unmap_hva_range = kvm_unmap_hva_range_pr,
2097         .age_hva  = kvm_age_hva_pr,
2098         .test_age_hva = kvm_test_age_hva_pr,
2099         .set_spte_hva = kvm_set_spte_hva_pr,
2100         .mmu_destroy  = kvmppc_mmu_destroy_pr,
2101         .free_memslot = kvmppc_core_free_memslot_pr,
2102         .create_memslot = kvmppc_core_create_memslot_pr,
2103         .init_vm = kvmppc_core_init_vm_pr,
2104         .destroy_vm = kvmppc_core_destroy_vm_pr,
2105         .get_smmu_info = kvm_vm_ioctl_get_smmu_info_pr,
2106         .emulate_op = kvmppc_core_emulate_op_pr,
2107         .emulate_mtspr = kvmppc_core_emulate_mtspr_pr,
2108         .emulate_mfspr = kvmppc_core_emulate_mfspr_pr,
2109         .fast_vcpu_kick = kvm_vcpu_kick,
2110         .arch_vm_ioctl  = kvm_arch_vm_ioctl_pr,
2111 #ifdef CONFIG_PPC_BOOK3S_64
2112         .hcall_implemented = kvmppc_hcall_impl_pr,
2113         .configure_mmu = kvm_configure_mmu_pr,
2114 #endif
2115         .giveup_ext = kvmppc_giveup_ext,
2116 };
2117
2118
2119 int kvmppc_book3s_init_pr(void)
2120 {
2121         int r;
2122
2123         r = kvmppc_core_check_processor_compat_pr();
2124         if (r < 0)
2125                 return r;
2126
2127         kvm_ops_pr.owner = THIS_MODULE;
2128         kvmppc_pr_ops = &kvm_ops_pr;
2129
2130         r = kvmppc_mmu_hpte_sysinit();
2131         return r;
2132 }
2133
2134 void kvmppc_book3s_exit_pr(void)
2135 {
2136         kvmppc_pr_ops = NULL;
2137         kvmppc_mmu_hpte_sysexit();
2138 }
2139
2140 /*
2141  * We only support separate modules for book3s 64
2142  */
2143 #ifdef CONFIG_PPC_BOOK3S_64
2144
2145 module_init(kvmppc_book3s_init_pr);
2146 module_exit(kvmppc_book3s_exit_pr);
2147
2148 MODULE_LICENSE("GPL");
2149 MODULE_ALIAS_MISCDEV(KVM_MINOR);
2150 MODULE_ALIAS("devname:kvm");
2151 #endif