arch/powerpc/kvm/book3s.c

   1 /*
   2  * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved.
   3  *
   4  * Authors:
   5  *    Alexander Graf <agraf@suse.de>
   6  *    Kevin Wolf <mail@kevin-wolf.de>
   7  *
   8  * Description:
   9  * This file is derived from arch/powerpc/kvm/44x.c,
  10  * by Hollis Blanchard <hollisb@us.ibm.com>.
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License, version 2, as
  14  * published by the Free Software Foundation.
  15  */
  16
  17 #include <linux/kvm_host.h>
  18 #include <linux/err.h>
  19 #include <linux/export.h>
  20 #include <linux/slab.h>
  21
  22 #include <asm/reg.h>
  23 #include <asm/cputable.h>
  24 #include <asm/cacheflush.h>
  25 #include <asm/tlbflush.h>
  26 #include <asm/uaccess.h>
  27 #include <asm/io.h>
  28 #include <asm/kvm_ppc.h>
  29 #include <asm/kvm_book3s.h>
  30 #include <asm/mmu_context.h>
  31 #include <asm/page.h>
  32 #include <linux/gfp.h>
  33 #include <linux/sched.h>
  34 #include <linux/vmalloc.h>
  35 #include <linux/highmem.h>
  36
  37 #include "trace.h"
  38
  39 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
  40
  41 /* #define EXIT_DEBUG */
  42
  43 struct kvm_stats_debugfs_item debugfs_entries[] = {
  44         { "exits",       VCPU_STAT(sum_exits) },
  45         { "mmio",        VCPU_STAT(mmio_exits) },
  46         { "sig",         VCPU_STAT(signal_exits) },
  47         { "sysc",        VCPU_STAT(syscall_exits) },
  48         { "inst_emu",    VCPU_STAT(emulated_inst_exits) },
  49         { "dec",         VCPU_STAT(dec_exits) },
  50         { "ext_intr",    VCPU_STAT(ext_intr_exits) },
  51         { "queue_intr",  VCPU_STAT(queue_intr) },
  52         { "halt_wakeup", VCPU_STAT(halt_wakeup) },
  53         { "pf_storage",  VCPU_STAT(pf_storage) },
  54         { "sp_storage",  VCPU_STAT(sp_storage) },
  55         { "pf_instruc",  VCPU_STAT(pf_instruc) },
  56         { "sp_instruc",  VCPU_STAT(sp_instruc) },
  57         { "ld",          VCPU_STAT(ld) },
  58         { "ld_slow",     VCPU_STAT(ld_slow) },
  59         { "st",          VCPU_STAT(st) },
  60         { "st_slow",     VCPU_STAT(st_slow) },
  61         { NULL }
  62 };
  63
  64 void kvmppc_core_load_host_debugstate(struct kvm_vcpu *vcpu)
  65 {
  66 }
  67
  68 void kvmppc_core_load_guest_debugstate(struct kvm_vcpu *vcpu)
  69 {
  70 }
  71
  72 void kvmppc_inject_interrupt(struct kvm_vcpu *vcpu, int vec, u64 flags)
  73 {
  74         vcpu->arch.shared->srr0 = kvmppc_get_pc(vcpu);
  75         vcpu->arch.shared->srr1 = vcpu->arch.shared->msr | flags;
  76         kvmppc_set_pc(vcpu, kvmppc_interrupt_offset(vcpu) + vec);
  77         vcpu->arch.mmu.reset_msr(vcpu);
  78 }
  79
  80 static int kvmppc_book3s_vec2irqprio(unsigned int vec)
  81 {
  82         unsigned int prio;
  83
  84         switch (vec) {
  85         case 0x100: prio = BOOK3S_IRQPRIO_SYSTEM_RESET;         break;
  86         case 0x200: prio = BOOK3S_IRQPRIO_MACHINE_CHECK;        break;
  87         case 0x300: prio = BOOK3S_IRQPRIO_DATA_STORAGE;         break;
  88         case 0x380: prio = BOOK3S_IRQPRIO_DATA_SEGMENT;         break;
  89         case 0x400: prio = BOOK3S_IRQPRIO_INST_STORAGE;         break;
  90         case 0x480: prio = BOOK3S_IRQPRIO_INST_SEGMENT;         break;
  91         case 0x500: prio = BOOK3S_IRQPRIO_EXTERNAL;             break;
  92         case 0x501: prio = BOOK3S_IRQPRIO_EXTERNAL_LEVEL;       break;
  93         case 0x600: prio = BOOK3S_IRQPRIO_ALIGNMENT;            break;
  94         case 0x700: prio = BOOK3S_IRQPRIO_PROGRAM;              break;
  95         case 0x800: prio = BOOK3S_IRQPRIO_FP_UNAVAIL;           break;
  96         case 0x900: prio = BOOK3S_IRQPRIO_DECREMENTER;          break;
  97         case 0xc00: prio = BOOK3S_IRQPRIO_SYSCALL;              break;
  98         case 0xd00: prio = BOOK3S_IRQPRIO_DEBUG;                break;
  99         case 0xf20: prio = BOOK3S_IRQPRIO_ALTIVEC;              break;
 100         case 0xf40: prio = BOOK3S_IRQPRIO_VSX;                  break;
 101         default:    prio = BOOK3S_IRQPRIO_MAX;                  break;
 102         }
 103
 104         return prio;
 105 }
 106
 107 static void kvmppc_book3s_dequeue_irqprio(struct kvm_vcpu *vcpu,
 108                                           unsigned int vec)
 109 {
 110         unsigned long old_pending = vcpu->arch.pending_exceptions;
 111
 112         clear_bit(kvmppc_book3s_vec2irqprio(vec),
 113                   &vcpu->arch.pending_exceptions);
 114
 115         kvmppc_update_int_pending(vcpu, vcpu->arch.pending_exceptions,
 116                                   old_pending);
 117 }
 118
 119 void kvmppc_book3s_queue_irqprio(struct kvm_vcpu *vcpu, unsigned int vec)
 120 {
 121         vcpu->stat.queue_intr++;
 122
 123         set_bit(kvmppc_book3s_vec2irqprio(vec),
 124                 &vcpu->arch.pending_exceptions);
 125 #ifdef EXIT_DEBUG
 126         printk(KERN_INFO "Queueing interrupt %x\n", vec);
 127 #endif
 128 }
 129
 130
 131 void kvmppc_core_queue_program(struct kvm_vcpu *vcpu, ulong flags)
 132 {
 133         /* might as well deliver this straight away */
 134         kvmppc_inject_interrupt(vcpu, BOOK3S_INTERRUPT_PROGRAM, flags);
 135 }
 136
 137 void kvmppc_core_queue_dec(struct kvm_vcpu *vcpu)
 138 {
 139         kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_DECREMENTER);
 140 }
 141
 142 int kvmppc_core_pending_dec(struct kvm_vcpu *vcpu)
 143 {
 144         return test_bit(BOOK3S_IRQPRIO_DECREMENTER, &vcpu->arch.pending_exceptions);
 145 }
 146
 147 void kvmppc_core_dequeue_dec(struct kvm_vcpu *vcpu)
 148 {
 149         kvmppc_book3s_dequeue_irqprio(vcpu, BOOK3S_INTERRUPT_DECREMENTER);
 150 }
 151
 152 void kvmppc_core_queue_external(struct kvm_vcpu *vcpu,
 153                                 struct kvm_interrupt *irq)
 154 {
 155         unsigned int vec = BOOK3S_INTERRUPT_EXTERNAL;
 156
 157         if (irq->irq == KVM_INTERRUPT_SET_LEVEL)
 158                 vec = BOOK3S_INTERRUPT_EXTERNAL_LEVEL;
 159
 160         kvmppc_book3s_queue_irqprio(vcpu, vec);
 161 }
 162
 163 void kvmppc_core_dequeue_external(struct kvm_vcpu *vcpu,
 164                                   struct kvm_interrupt *irq)
 165 {
 166         kvmppc_book3s_dequeue_irqprio(vcpu, BOOK3S_INTERRUPT_EXTERNAL);
 167         kvmppc_book3s_dequeue_irqprio(vcpu, BOOK3S_INTERRUPT_EXTERNAL_LEVEL);
 168 }
 169
 170 int kvmppc_book3s_irqprio_deliver(struct kvm_vcpu *vcpu, unsigned int priority)
 171 {
 172         int deliver = 1;
 173         int vec = 0;
 174         bool crit = kvmppc_critical_section(vcpu);
 175
 176         switch (priority) {
 177         case BOOK3S_IRQPRIO_DECREMENTER:
 178                 deliver = (vcpu->arch.shared->msr & MSR_EE) && !crit;
 179                 vec = BOOK3S_INTERRUPT_DECREMENTER;
 180                 break;
 181         case BOOK3S_IRQPRIO_EXTERNAL:
 182         case BOOK3S_IRQPRIO_EXTERNAL_LEVEL:
 183                 deliver = (vcpu->arch.shared->msr & MSR_EE) && !crit;
 184                 vec = BOOK3S_INTERRUPT_EXTERNAL;
 185                 break;
 186         case BOOK3S_IRQPRIO_SYSTEM_RESET:
 187                 vec = BOOK3S_INTERRUPT_SYSTEM_RESET;
 188                 break;
 189         case BOOK3S_IRQPRIO_MACHINE_CHECK:
 190                 vec = BOOK3S_INTERRUPT_MACHINE_CHECK;
 191                 break;
 192         case BOOK3S_IRQPRIO_DATA_STORAGE:
 193                 vec = BOOK3S_INTERRUPT_DATA_STORAGE;
 194                 break;
 195         case BOOK3S_IRQPRIO_INST_STORAGE:
 196                 vec = BOOK3S_INTERRUPT_INST_STORAGE;
 197                 break;
 198         case BOOK3S_IRQPRIO_DATA_SEGMENT:
 199                 vec = BOOK3S_INTERRUPT_DATA_SEGMENT;
 200                 break;
 201         case BOOK3S_IRQPRIO_INST_SEGMENT:
 202                 vec = BOOK3S_INTERRUPT_INST_SEGMENT;
 203                 break;
 204         case BOOK3S_IRQPRIO_ALIGNMENT:
 205                 vec = BOOK3S_INTERRUPT_ALIGNMENT;
 206                 break;
 207         case BOOK3S_IRQPRIO_PROGRAM:
 208                 vec = BOOK3S_INTERRUPT_PROGRAM;
 209                 break;
 210         case BOOK3S_IRQPRIO_VSX:
 211                 vec = BOOK3S_INTERRUPT_VSX;
 212                 break;
 213         case BOOK3S_IRQPRIO_ALTIVEC:
 214                 vec = BOOK3S_INTERRUPT_ALTIVEC;
 215                 break;
 216         case BOOK3S_IRQPRIO_FP_UNAVAIL:
 217                 vec = BOOK3S_INTERRUPT_FP_UNAVAIL;
 218                 break;
 219         case BOOK3S_IRQPRIO_SYSCALL:
 220                 vec = BOOK3S_INTERRUPT_SYSCALL;
 221                 break;
 222         case BOOK3S_IRQPRIO_DEBUG:
 223                 vec = BOOK3S_INTERRUPT_TRACE;
 224                 break;
 225         case BOOK3S_IRQPRIO_PERFORMANCE_MONITOR:
 226                 vec = BOOK3S_INTERRUPT_PERFMON;
 227                 break;
 228         default:
 229                 deliver = 0;
 230                 printk(KERN_ERR "KVM: Unknown interrupt: 0x%x\n", priority);
 231                 break;
 232         }
 233
 234 #if 0
 235         printk(KERN_INFO "Deliver interrupt 0x%x? %x\n", vec, deliver);
 236 #endif
 237
 238         if (deliver)
 239                 kvmppc_inject_interrupt(vcpu, vec, 0);
 240
 241         return deliver;
 242 }
 243
 244 /*
 245  * This function determines if an irqprio should be cleared once issued.
 246  */
 247 static bool clear_irqprio(struct kvm_vcpu *vcpu, unsigned int priority)
 248 {
 249         switch (priority) {
 250                 case BOOK3S_IRQPRIO_DECREMENTER:
 251                         /* DEC interrupts get cleared by mtdec */
 252                         return false;
 253                 case BOOK3S_IRQPRIO_EXTERNAL_LEVEL:
 254                         /* External interrupts get cleared by userspace */
 255                         return false;
 256         }
 257
 258         return true;
 259 }
 260
 261 int kvmppc_core_prepare_to_enter(struct kvm_vcpu *vcpu)
 262 {
 263         unsigned long *pending = &vcpu->arch.pending_exceptions;
 264         unsigned long old_pending = vcpu->arch.pending_exceptions;
 265         unsigned int priority;
 266
 267 #ifdef EXIT_DEBUG
 268         if (vcpu->arch.pending_exceptions)
 269                 printk(KERN_EMERG "KVM: Check pending: %lx\n", vcpu->arch.pending_exceptions);
 270 #endif
 271         priority = __ffs(*pending);
 272         while (priority < BOOK3S_IRQPRIO_MAX) {
 273                 if (kvmppc_book3s_irqprio_deliver(vcpu, priority) &&
 274                     clear_irqprio(vcpu, priority)) {
 275                         clear_bit(priority, &vcpu->arch.pending_exceptions);
 276                         break;
 277                 }
 278
 279                 priority = find_next_bit(pending,
 280                                          BITS_PER_BYTE * sizeof(*pending),
 281                                          priority + 1);
 282         }
 283
 284         /* Tell the guest about our interrupt status */
 285         kvmppc_update_int_pending(vcpu, *pending, old_pending);
 286
 287         return 0;
 288 }
 289
 290 pfn_t kvmppc_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn)
 291 {
 292         ulong mp_pa = vcpu->arch.magic_page_pa;
 293
 294         if (!(vcpu->arch.shared->msr & MSR_SF))
 295                 mp_pa = (uint32_t)mp_pa;
 296
 297         /* Magic page override */
 298         if (unlikely(mp_pa) &&
 299             unlikely(((gfn << PAGE_SHIFT) & KVM_PAM) ==
 300                      ((mp_pa & PAGE_MASK) & KVM_PAM))) {
 301                 ulong shared_page = ((ulong)vcpu->arch.shared) & PAGE_MASK;
 302                 pfn_t pfn;
 303
 304                 pfn = (pfn_t)virt_to_phys((void*)shared_page) >> PAGE_SHIFT;
 305                 get_page(pfn_to_page(pfn));
 306                 return pfn;
 307         }
 308
 309         return gfn_to_pfn(vcpu->kvm, gfn);
 310 }
 311
 312 static int kvmppc_xlate(struct kvm_vcpu *vcpu, ulong eaddr, bool data,
 313                          struct kvmppc_pte *pte)
 314 {
 315         int relocated = (vcpu->arch.shared->msr & (data ? MSR_DR : MSR_IR));
 316         int r;
 317
 318         if (relocated) {
 319                 r = vcpu->arch.mmu.xlate(vcpu, eaddr, pte, data);
 320         } else {
 321                 pte->eaddr = eaddr;
 322                 pte->raddr = eaddr & KVM_PAM;
 323                 pte->vpage = VSID_REAL | eaddr >> 12;
 324                 pte->may_read = true;
 325                 pte->may_write = true;
 326                 pte->may_execute = true;
 327                 r = 0;
 328         }
 329
 330         return r;
 331 }
 332
 333 static hva_t kvmppc_bad_hva(void)
 334 {
 335         return PAGE_OFFSET;
 336 }
 337
 338 static hva_t kvmppc_pte_to_hva(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte,
 339                                bool read)
 340 {
 341         hva_t hpage;
 342
 343         if (read && !pte->may_read)
 344                 goto err;
 345
 346         if (!read && !pte->may_write)
 347                 goto err;
 348
 349         hpage = gfn_to_hva(vcpu->kvm, pte->raddr >> PAGE_SHIFT);
 350         if (kvm_is_error_hva(hpage))
 351                 goto err;
 352
 353         return hpage | (pte->raddr & ~PAGE_MASK);
 354 err:
 355         return kvmppc_bad_hva();
 356 }
 357
 358 int kvmppc_st(struct kvm_vcpu *vcpu, ulong *eaddr, int size, void *ptr,
 359               bool data)
 360 {
 361         struct kvmppc_pte pte;
 362
 363         vcpu->stat.st++;
 364
 365         if (kvmppc_xlate(vcpu, *eaddr, data, &pte))
 366                 return -ENOENT;
 367
 368         *eaddr = pte.raddr;
 369
 370         if (!pte.may_write)
 371                 return -EPERM;
 372
 373         if (kvm_write_guest(vcpu->kvm, pte.raddr, ptr, size))
 374                 return EMULATE_DO_MMIO;
 375
 376         return EMULATE_DONE;
 377 }
 378
 379 int kvmppc_ld(struct kvm_vcpu *vcpu, ulong *eaddr, int size, void *ptr,
 380                       bool data)
 381 {
 382         struct kvmppc_pte pte;
 383         hva_t hva = *eaddr;
 384
 385         vcpu->stat.ld++;
 386
 387         if (kvmppc_xlate(vcpu, *eaddr, data, &pte))
 388                 goto nopte;
 389
 390         *eaddr = pte.raddr;
 391
 392         hva = kvmppc_pte_to_hva(vcpu, &pte, true);
 393         if (kvm_is_error_hva(hva))
 394                 goto mmio;
 395
 396         if (copy_from_user(ptr, (void __user *)hva, size)) {
 397                 printk(KERN_INFO "kvmppc_ld at 0x%lx failed\n", hva);
 398                 goto mmio;
 399         }
 400
 401         return EMULATE_DONE;
 402
 403 nopte:
 404         return -ENOENT;
 405 mmio:
 406         return EMULATE_DO_MMIO;
 407 }
 408
 409 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
 410 {
 411         return 0;
 412 }
 413
 414 int kvmppc_subarch_vcpu_init(struct kvm_vcpu *vcpu)
 415 {
 416         return 0;
 417 }
 418
 419 void kvmppc_subarch_vcpu_uninit(struct kvm_vcpu *vcpu)
 420 {
 421 }
 422
 423 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 424 {
 425         int i;
 426
 427         regs->pc = kvmppc_get_pc(vcpu);
 428         regs->cr = kvmppc_get_cr(vcpu);
 429         regs->ctr = kvmppc_get_ctr(vcpu);
 430         regs->lr = kvmppc_get_lr(vcpu);
 431         regs->xer = kvmppc_get_xer(vcpu);
 432         regs->msr = vcpu->arch.shared->msr;
 433         regs->srr0 = vcpu->arch.shared->srr0;
 434         regs->srr1 = vcpu->arch.shared->srr1;
 435         regs->pid = vcpu->arch.pid;
 436         regs->sprg0 = vcpu->arch.shared->sprg0;
 437         regs->sprg1 = vcpu->arch.shared->sprg1;
 438         regs->sprg2 = vcpu->arch.shared->sprg2;
 439         regs->sprg3 = vcpu->arch.shared->sprg3;
 440         regs->sprg4 = vcpu->arch.shared->sprg4;
 441         regs->sprg5 = vcpu->arch.shared->sprg5;
 442         regs->sprg6 = vcpu->arch.shared->sprg6;
 443         regs->sprg7 = vcpu->arch.shared->sprg7;
 444
 445         for (i = 0; i < ARRAY_SIZE(regs->gpr); i++)
 446                 regs->gpr[i] = kvmppc_get_gpr(vcpu, i);
 447
 448         return 0;
 449 }
 450
 451 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 452 {
 453         int i;
 454
 455         kvmppc_set_pc(vcpu, regs->pc);
 456         kvmppc_set_cr(vcpu, regs->cr);
 457         kvmppc_set_ctr(vcpu, regs->ctr);
 458         kvmppc_set_lr(vcpu, regs->lr);
 459         kvmppc_set_xer(vcpu, regs->xer);
 460         kvmppc_set_msr(vcpu, regs->msr);
 461         vcpu->arch.shared->srr0 = regs->srr0;
 462         vcpu->arch.shared->srr1 = regs->srr1;
 463         vcpu->arch.shared->sprg0 = regs->sprg0;
 464         vcpu->arch.shared->sprg1 = regs->sprg1;
 465         vcpu->arch.shared->sprg2 = regs->sprg2;
 466         vcpu->arch.shared->sprg3 = regs->sprg3;
 467         vcpu->arch.shared->sprg4 = regs->sprg4;
 468         vcpu->arch.shared->sprg5 = regs->sprg5;
 469         vcpu->arch.shared->sprg6 = regs->sprg6;
 470         vcpu->arch.shared->sprg7 = regs->sprg7;
 471
 472         for (i = 0; i < ARRAY_SIZE(regs->gpr); i++)
 473                 kvmppc_set_gpr(vcpu, i, regs->gpr[i]);
 474
 475         return 0;
 476 }
 477
 478 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 479 {
 480         return -ENOTSUPP;
 481 }
 482
 483 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 484 {
 485         return -ENOTSUPP;
 486 }
 487
 488 int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
 489 {
 490         int r;
 491         union kvmppc_one_reg val;
 492         int size;
 493         long int i;
 494
 495         size = one_reg_size(reg->id);
 496         if (size > sizeof(val))
 497                 return -EINVAL;
 498
 499         r = kvmppc_get_one_reg(vcpu, reg->id, &val);
 500
 501         if (r == -EINVAL) {
 502                 r = 0;
 503                 switch (reg->id) {
 504                 case KVM_REG_PPC_DAR:
 505                         val = get_reg_val(reg->id, vcpu->arch.shared->dar);
 506                         break;
 507                 case KVM_REG_PPC_DSISR:
 508                         val = get_reg_val(reg->id, vcpu->arch.shared->dsisr);
 509                         break;
 510                 case KVM_REG_PPC_FPR0 ... KVM_REG_PPC_FPR31:
 511                         i = reg->id - KVM_REG_PPC_FPR0;
 512                         val = get_reg_val(reg->id, vcpu->arch.fpr[i]);
 513                         break;
 514                 case KVM_REG_PPC_FPSCR:
 515                         val = get_reg_val(reg->id, vcpu->arch.fpscr);
 516                         break;
 517 #ifdef CONFIG_ALTIVEC
 518                 case KVM_REG_PPC_VR0 ... KVM_REG_PPC_VR31:
 519                         if (!cpu_has_feature(CPU_FTR_ALTIVEC)) {
 520                                 r = -ENXIO;
 521                                 break;
 522                         }
 523                         val.vval = vcpu->arch.vr[reg->id - KVM_REG_PPC_VR0];
 524                         break;
 525                 case KVM_REG_PPC_VSCR:
 526                         if (!cpu_has_feature(CPU_FTR_ALTIVEC)) {
 527                                 r = -ENXIO;
 528                                 break;
 529                         }
 530                         val = get_reg_val(reg->id, vcpu->arch.vscr.u[3]);
 531                         break;
 532 #endif /* CONFIG_ALTIVEC */
 533                 default:
 534                         r = -EINVAL;
 535                         break;
 536                 }
 537         }
 538         if (r)
 539                 return r;
 540
 541         if (copy_to_user((char __user *)(unsigned long)reg->addr, &val, size))
 542                 r = -EFAULT;
 543
 544         return r;
 545 }
 546
 547 int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
 548 {
 549         int r;
 550         union kvmppc_one_reg val;
 551         int size;
 552         long int i;
 553
 554         size = one_reg_size(reg->id);
 555         if (size > sizeof(val))
 556                 return -EINVAL;
 557
 558         if (copy_from_user(&val, (char __user *)(unsigned long)reg->addr, size))
 559                 return -EFAULT;
 560
 561         r = kvmppc_set_one_reg(vcpu, reg->id, &val);
 562
 563         if (r == -EINVAL) {
 564                 r = 0;
 565                 switch (reg->id) {
 566                 case KVM_REG_PPC_DAR:
 567                         vcpu->arch.shared->dar = set_reg_val(reg->id, val);
 568                         break;
 569                 case KVM_REG_PPC_DSISR:
 570                         vcpu->arch.shared->dsisr = set_reg_val(reg->id, val);
 571                         break;
 572                 case KVM_REG_PPC_FPR0 ... KVM_REG_PPC_FPR31:
 573                         i = reg->id - KVM_REG_PPC_FPR0;
 574                         vcpu->arch.fpr[i] = set_reg_val(reg->id, val);
 575                         break;
 576                 case KVM_REG_PPC_FPSCR:
 577                         vcpu->arch.fpscr = set_reg_val(reg->id, val);
 578                         break;
 579 #ifdef CONFIG_ALTIVEC
 580                 case KVM_REG_PPC_VR0 ... KVM_REG_PPC_VR31:
 581                         if (!cpu_has_feature(CPU_FTR_ALTIVEC)) {
 582                                 r = -ENXIO;
 583                                 break;
 584                         }
 585                         vcpu->arch.vr[reg->id - KVM_REG_PPC_VR0] = val.vval;
 586                         break;
 587                 case KVM_REG_PPC_VSCR:
 588                         if (!cpu_has_feature(CPU_FTR_ALTIVEC)) {
 589                                 r = -ENXIO;
 590                                 break;
 591                         }
 592                         vcpu->arch.vscr.u[3] = set_reg_val(reg->id, val);
 593                         break;
 594 #endif /* CONFIG_ALTIVEC */
 595                 default:
 596                         r = -EINVAL;
 597                         break;
 598                 }
 599         }
 600
 601         return r;
 602 }
 603
 604 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 605                                   struct kvm_translation *tr)
 606 {
 607         return 0;
 608 }
 609
 610 void kvmppc_decrementer_func(unsigned long data)
 611 {
 612         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
 613
 614         kvmppc_core_queue_dec(vcpu);
 615         kvm_vcpu_kick(vcpu);
 616 }