arch/powerpc/kvm/booke_guest.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License, version 2, as
   4  * published by the Free Software Foundation.
   5  *
   6  * This program is distributed in the hope that it will be useful,
   7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9  * GNU General Public License for more details.
  10  *
  11  * You should have received a copy of the GNU General Public License
  12  * along with this program; if not, write to the Free Software
  13  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  14  *
  15  * Copyright IBM Corp. 2007
  16  *
  17  * Authors: Hollis Blanchard <hollisb@us.ibm.com>
  18  *          Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
  19  */
  20
  21 #include <linux/errno.h>
  22 #include <linux/err.h>
  23 #include <linux/kvm_host.h>
  24 #include <linux/module.h>
  25 #include <linux/vmalloc.h>
  26 #include <linux/fs.h>
  27 #include <asm/cputable.h>
  28 #include <asm/uaccess.h>
  29 #include <asm/kvm_ppc.h>
  30
  31 #include "44x_tlb.h"
  32
  33 #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
  34 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
  35
  36 struct kvm_stats_debugfs_item debugfs_entries[] = {
  37         { "exits",      VCPU_STAT(sum_exits) },
  38         { "mmio",       VCPU_STAT(mmio_exits) },
  39         { "dcr",        VCPU_STAT(dcr_exits) },
  40         { "sig",        VCPU_STAT(signal_exits) },
  41         { "light",      VCPU_STAT(light_exits) },
  42         { "itlb_r",     VCPU_STAT(itlb_real_miss_exits) },
  43         { "itlb_v",     VCPU_STAT(itlb_virt_miss_exits) },
  44         { "dtlb_r",     VCPU_STAT(dtlb_real_miss_exits) },
  45         { "dtlb_v",     VCPU_STAT(dtlb_virt_miss_exits) },
  46         { "sysc",       VCPU_STAT(syscall_exits) },
  47         { "isi",        VCPU_STAT(isi_exits) },
  48         { "dsi",        VCPU_STAT(dsi_exits) },
  49         { "inst_emu",   VCPU_STAT(emulated_inst_exits) },
  50         { "dec",        VCPU_STAT(dec_exits) },
  51         { "ext_intr",   VCPU_STAT(ext_intr_exits) },
  52         { "halt_wakeup", VCPU_STAT(halt_wakeup) },
  53         { NULL }
  54 };
  55
  56 static const u32 interrupt_msr_mask[16] = {
  57         [BOOKE_INTERRUPT_CRITICAL]      = MSR_ME,
  58         [BOOKE_INTERRUPT_MACHINE_CHECK] = 0,
  59         [BOOKE_INTERRUPT_DATA_STORAGE]  = MSR_CE|MSR_ME|MSR_DE,
  60         [BOOKE_INTERRUPT_INST_STORAGE]  = MSR_CE|MSR_ME|MSR_DE,
  61         [BOOKE_INTERRUPT_EXTERNAL]      = MSR_CE|MSR_ME|MSR_DE,
  62         [BOOKE_INTERRUPT_ALIGNMENT]     = MSR_CE|MSR_ME|MSR_DE,
  63         [BOOKE_INTERRUPT_PROGRAM]       = MSR_CE|MSR_ME|MSR_DE,
  64         [BOOKE_INTERRUPT_FP_UNAVAIL]    = MSR_CE|MSR_ME|MSR_DE,
  65         [BOOKE_INTERRUPT_SYSCALL]       = MSR_CE|MSR_ME|MSR_DE,
  66         [BOOKE_INTERRUPT_AP_UNAVAIL]    = MSR_CE|MSR_ME|MSR_DE,
  67         [BOOKE_INTERRUPT_DECREMENTER]   = MSR_CE|MSR_ME|MSR_DE,
  68         [BOOKE_INTERRUPT_FIT]           = MSR_CE|MSR_ME|MSR_DE,
  69         [BOOKE_INTERRUPT_WATCHDOG]      = MSR_ME,
  70         [BOOKE_INTERRUPT_DTLB_MISS]     = MSR_CE|MSR_ME|MSR_DE,
  71         [BOOKE_INTERRUPT_ITLB_MISS]     = MSR_CE|MSR_ME|MSR_DE,
  72         [BOOKE_INTERRUPT_DEBUG]         = MSR_ME,
  73 };
  74
  75 const unsigned char exception_priority[] = {
  76         [BOOKE_INTERRUPT_DATA_STORAGE] = 0,
  77         [BOOKE_INTERRUPT_INST_STORAGE] = 1,
  78         [BOOKE_INTERRUPT_ALIGNMENT] = 2,
  79         [BOOKE_INTERRUPT_PROGRAM] = 3,
  80         [BOOKE_INTERRUPT_FP_UNAVAIL] = 4,
  81         [BOOKE_INTERRUPT_SYSCALL] = 5,
  82         [BOOKE_INTERRUPT_AP_UNAVAIL] = 6,
  83         [BOOKE_INTERRUPT_DTLB_MISS] = 7,
  84         [BOOKE_INTERRUPT_ITLB_MISS] = 8,
  85         [BOOKE_INTERRUPT_MACHINE_CHECK] = 9,
  86         [BOOKE_INTERRUPT_DEBUG] = 10,
  87         [BOOKE_INTERRUPT_CRITICAL] = 11,
  88         [BOOKE_INTERRUPT_WATCHDOG] = 12,
  89         [BOOKE_INTERRUPT_EXTERNAL] = 13,
  90         [BOOKE_INTERRUPT_FIT] = 14,
  91         [BOOKE_INTERRUPT_DECREMENTER] = 15,
  92 };
  93
  94 const unsigned char priority_exception[] = {
  95         BOOKE_INTERRUPT_DATA_STORAGE,
  96         BOOKE_INTERRUPT_INST_STORAGE,
  97         BOOKE_INTERRUPT_ALIGNMENT,
  98         BOOKE_INTERRUPT_PROGRAM,
  99         BOOKE_INTERRUPT_FP_UNAVAIL,
 100         BOOKE_INTERRUPT_SYSCALL,
 101         BOOKE_INTERRUPT_AP_UNAVAIL,
 102         BOOKE_INTERRUPT_DTLB_MISS,
 103         BOOKE_INTERRUPT_ITLB_MISS,
 104         BOOKE_INTERRUPT_MACHINE_CHECK,
 105         BOOKE_INTERRUPT_DEBUG,
 106         BOOKE_INTERRUPT_CRITICAL,
 107         BOOKE_INTERRUPT_WATCHDOG,
 108         BOOKE_INTERRUPT_EXTERNAL,
 109         BOOKE_INTERRUPT_FIT,
 110         BOOKE_INTERRUPT_DECREMENTER,
 111 };
 112
 113
 114 /* TODO: use vcpu_printf() */
 115 void kvmppc_dump_vcpu(struct kvm_vcpu *vcpu)
 116 {
 117         int i;
 118
 119         printk("pc:   %08x msr:  %08x\n", vcpu->arch.pc, vcpu->arch.msr);
 120         printk("lr:   %08x ctr:  %08x\n", vcpu->arch.lr, vcpu->arch.ctr);
 121         printk("srr0: %08x srr1: %08x\n", vcpu->arch.srr0, vcpu->arch.srr1);
 122
 123         printk("exceptions: %08lx\n", vcpu->arch.pending_exceptions);
 124
 125         for (i = 0; i < 32; i += 4) {
 126                 printk("gpr%02d: %08x %08x %08x %08x\n", i,
 127                        vcpu->arch.gpr[i],
 128                        vcpu->arch.gpr[i+1],
 129                        vcpu->arch.gpr[i+2],
 130                        vcpu->arch.gpr[i+3]);
 131         }
 132 }
 133
 134 /* Check if we are ready to deliver the interrupt */
 135 static int kvmppc_can_deliver_interrupt(struct kvm_vcpu *vcpu, int interrupt)
 136 {
 137         int r;
 138
 139         switch (interrupt) {
 140         case BOOKE_INTERRUPT_CRITICAL:
 141                 r = vcpu->arch.msr & MSR_CE;
 142                 break;
 143         case BOOKE_INTERRUPT_MACHINE_CHECK:
 144                 r = vcpu->arch.msr & MSR_ME;
 145                 break;
 146         case BOOKE_INTERRUPT_EXTERNAL:
 147                 r = vcpu->arch.msr & MSR_EE;
 148                 break;
 149         case BOOKE_INTERRUPT_DECREMENTER:
 150                 r = vcpu->arch.msr & MSR_EE;
 151                 break;
 152         case BOOKE_INTERRUPT_FIT:
 153                 r = vcpu->arch.msr & MSR_EE;
 154                 break;
 155         case BOOKE_INTERRUPT_WATCHDOG:
 156                 r = vcpu->arch.msr & MSR_CE;
 157                 break;
 158         case BOOKE_INTERRUPT_DEBUG:
 159                 r = vcpu->arch.msr & MSR_DE;
 160                 break;
 161         default:
 162                 r = 1;
 163         }
 164
 165         return r;
 166 }
 167
 168 static void kvmppc_deliver_interrupt(struct kvm_vcpu *vcpu, int interrupt)
 169 {
 170         switch (interrupt) {
 171         case BOOKE_INTERRUPT_DECREMENTER:
 172                 vcpu->arch.tsr |= TSR_DIS;
 173                 break;
 174         }
 175
 176         vcpu->arch.srr0 = vcpu->arch.pc;
 177         vcpu->arch.srr1 = vcpu->arch.msr;
 178         vcpu->arch.pc = vcpu->arch.ivpr | vcpu->arch.ivor[interrupt];
 179         kvmppc_set_msr(vcpu, vcpu->arch.msr & interrupt_msr_mask[interrupt]);
 180 }
 181
 182 /* Check pending exceptions and deliver one, if possible. */
 183 void kvmppc_check_and_deliver_interrupts(struct kvm_vcpu *vcpu)
 184 {
 185         unsigned long *pending = &vcpu->arch.pending_exceptions;
 186         unsigned int exception;
 187         unsigned int priority;
 188
 189         priority = find_first_bit(pending, BITS_PER_BYTE * sizeof(*pending));
 190         while (priority <= BOOKE_MAX_INTERRUPT) {
 191                 exception = priority_exception[priority];
 192                 if (kvmppc_can_deliver_interrupt(vcpu, exception)) {
 193                         kvmppc_clear_exception(vcpu, exception);
 194                         kvmppc_deliver_interrupt(vcpu, exception);
 195                         break;
 196                 }
 197
 198                 priority = find_next_bit(pending,
 199                                          BITS_PER_BYTE * sizeof(*pending),
 200                                          priority + 1);
 201         }
 202 }
 203
 204 /**
 205  * kvmppc_handle_exit
 206  *
 207  * Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV)
 208  */
 209 int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
 210                        unsigned int exit_nr)
 211 {
 212         enum emulation_result er;
 213         int r = RESUME_HOST;
 214
 215         local_irq_enable();
 216
 217         run->exit_reason = KVM_EXIT_UNKNOWN;
 218         run->ready_for_interrupt_injection = 1;
 219
 220         switch (exit_nr) {
 221         case BOOKE_INTERRUPT_MACHINE_CHECK:
 222                 printk("MACHINE CHECK: %lx\n", mfspr(SPRN_MCSR));
 223                 kvmppc_dump_vcpu(vcpu);
 224                 r = RESUME_HOST;
 225                 break;
 226
 227         case BOOKE_INTERRUPT_EXTERNAL:
 228         case BOOKE_INTERRUPT_DECREMENTER:
 229                 /* Since we switched IVPR back to the host's value, the host
 230                  * handled this interrupt the moment we enabled interrupts.
 231                  * Now we just offer it a chance to reschedule the guest. */
 232
 233                 /* XXX At this point the TLB still holds our shadow TLB, so if
 234                  * we do reschedule the host will fault over it. Perhaps we
 235                  * should politely restore the host's entries to minimize
 236                  * misses before ceding control. */
 237                 if (need_resched())
 238                         cond_resched();
 239                 if (exit_nr == BOOKE_INTERRUPT_DECREMENTER)
 240                         vcpu->stat.dec_exits++;
 241                 else
 242                         vcpu->stat.ext_intr_exits++;
 243                 r = RESUME_GUEST;
 244                 break;
 245
 246         case BOOKE_INTERRUPT_PROGRAM:
 247                 if (vcpu->arch.msr & MSR_PR) {
 248                         /* Program traps generated by user-level software must be handled
 249                          * by the guest kernel. */
 250                         vcpu->arch.esr = vcpu->arch.fault_esr;
 251                         kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_PROGRAM);
 252                         r = RESUME_GUEST;
 253                         break;
 254                 }
 255
 256                 er = kvmppc_emulate_instruction(run, vcpu);
 257                 switch (er) {
 258                 case EMULATE_DONE:
 259                         /* Future optimization: only reload non-volatiles if
 260                          * they were actually modified by emulation. */
 261                         vcpu->stat.emulated_inst_exits++;
 262                         r = RESUME_GUEST_NV;
 263                         break;
 264                 case EMULATE_DO_DCR:
 265                         run->exit_reason = KVM_EXIT_DCR;
 266                         r = RESUME_HOST;
 267                         break;
 268                 case EMULATE_FAIL:
 269                         /* XXX Deliver Program interrupt to guest. */
 270                         printk(KERN_CRIT "%s: emulation at %x failed (%08x)\n",
 271                                __func__, vcpu->arch.pc, vcpu->arch.last_inst);
 272                         /* For debugging, encode the failing instruction and
 273                          * report it to userspace. */
 274                         run->hw.hardware_exit_reason = ~0ULL << 32;
 275                         run->hw.hardware_exit_reason |= vcpu->arch.last_inst;
 276                         r = RESUME_HOST;
 277                         break;
 278                 default:
 279                         BUG();
 280                 }
 281                 break;
 282
 283         case BOOKE_INTERRUPT_FP_UNAVAIL:
 284                 kvmppc_queue_exception(vcpu, exit_nr);
 285                 r = RESUME_GUEST;
 286                 break;
 287
 288         case BOOKE_INTERRUPT_DATA_STORAGE:
 289                 vcpu->arch.dear = vcpu->arch.fault_dear;
 290                 vcpu->arch.esr = vcpu->arch.fault_esr;
 291                 kvmppc_queue_exception(vcpu, exit_nr);
 292                 vcpu->stat.dsi_exits++;
 293                 r = RESUME_GUEST;
 294                 break;
 295
 296         case BOOKE_INTERRUPT_INST_STORAGE:
 297                 vcpu->arch.esr = vcpu->arch.fault_esr;
 298                 kvmppc_queue_exception(vcpu, exit_nr);
 299                 vcpu->stat.isi_exits++;
 300                 r = RESUME_GUEST;
 301                 break;
 302
 303         case BOOKE_INTERRUPT_SYSCALL:
 304                 kvmppc_queue_exception(vcpu, exit_nr);
 305                 vcpu->stat.syscall_exits++;
 306                 r = RESUME_GUEST;
 307                 break;
 308
 309         case BOOKE_INTERRUPT_DTLB_MISS: {
 310                 struct kvmppc_44x_tlbe *gtlbe;
 311                 unsigned long eaddr = vcpu->arch.fault_dear;
 312                 gfn_t gfn;
 313
 314                 /* Check the guest TLB. */
 315                 gtlbe = kvmppc_44x_dtlb_search(vcpu, eaddr);
 316                 if (!gtlbe) {
 317                         /* The guest didn't have a mapping for it. */
 318                         kvmppc_queue_exception(vcpu, exit_nr);
 319                         vcpu->arch.dear = vcpu->arch.fault_dear;
 320                         vcpu->arch.esr = vcpu->arch.fault_esr;
 321                         vcpu->stat.dtlb_real_miss_exits++;
 322                         r = RESUME_GUEST;
 323                         break;
 324                 }
 325
 326                 vcpu->arch.paddr_accessed = tlb_xlate(gtlbe, eaddr);
 327                 gfn = vcpu->arch.paddr_accessed >> PAGE_SHIFT;
 328
 329                 if (kvm_is_visible_gfn(vcpu->kvm, gfn)) {
 330                         /* The guest TLB had a mapping, but the shadow TLB
 331                          * didn't, and it is RAM. This could be because:
 332                          * a) the entry is mapping the host kernel, or
 333                          * b) the guest used a large mapping which we're faking
 334                          * Either way, we need to satisfy the fault without
 335                          * invoking the guest. */
 336                         kvmppc_mmu_map(vcpu, eaddr, gfn, gtlbe->tid,
 337                                        gtlbe->word2);
 338                         vcpu->stat.dtlb_virt_miss_exits++;
 339                         r = RESUME_GUEST;
 340                 } else {
 341                         /* Guest has mapped and accessed a page which is not
 342                          * actually RAM. */
 343                         r = kvmppc_emulate_mmio(run, vcpu);
 344                 }
 345
 346                 break;
 347         }
 348
 349         case BOOKE_INTERRUPT_ITLB_MISS: {
 350                 struct kvmppc_44x_tlbe *gtlbe;
 351                 unsigned long eaddr = vcpu->arch.pc;
 352                 gfn_t gfn;
 353
 354                 r = RESUME_GUEST;
 355
 356                 /* Check the guest TLB. */
 357                 gtlbe = kvmppc_44x_itlb_search(vcpu, eaddr);
 358                 if (!gtlbe) {
 359                         /* The guest didn't have a mapping for it. */
 360                         kvmppc_queue_exception(vcpu, exit_nr);
 361                         vcpu->stat.itlb_real_miss_exits++;
 362                         break;
 363                 }
 364
 365                 vcpu->stat.itlb_virt_miss_exits++;
 366
 367                 gfn = tlb_xlate(gtlbe, eaddr) >> PAGE_SHIFT;
 368
 369                 if (kvm_is_visible_gfn(vcpu->kvm, gfn)) {
 370                         /* The guest TLB had a mapping, but the shadow TLB
 371                          * didn't. This could be because:
 372                          * a) the entry is mapping the host kernel, or
 373                          * b) the guest used a large mapping which we're faking
 374                          * Either way, we need to satisfy the fault without
 375                          * invoking the guest. */
 376                         kvmppc_mmu_map(vcpu, eaddr, gfn, gtlbe->tid,
 377                                        gtlbe->word2);
 378                 } else {
 379                         /* Guest mapped and leaped at non-RAM! */
 380                         kvmppc_queue_exception(vcpu,
 381                                                BOOKE_INTERRUPT_MACHINE_CHECK);
 382                 }
 383
 384                 break;
 385         }
 386
 387         case BOOKE_INTERRUPT_DEBUG: {
 388                 u32 dbsr;
 389
 390                 vcpu->arch.pc = mfspr(SPRN_CSRR0);
 391
 392                 /* clear IAC events in DBSR register */
 393                 dbsr = mfspr(SPRN_DBSR);
 394                 dbsr &= DBSR_IAC1 | DBSR_IAC2 | DBSR_IAC3 | DBSR_IAC4;
 395                 mtspr(SPRN_DBSR, dbsr);
 396
 397                 run->exit_reason = KVM_EXIT_DEBUG;
 398                 r = RESUME_HOST;
 399                 break;
 400         }
 401
 402         default:
 403                 printk(KERN_EMERG "exit_nr %d\n", exit_nr);
 404                 BUG();
 405         }
 406
 407         local_irq_disable();
 408
 409         kvmppc_check_and_deliver_interrupts(vcpu);
 410
 411         /* Do some exit accounting. */
 412         vcpu->stat.sum_exits++;
 413         if (!(r & RESUME_HOST)) {
 414                 /* To avoid clobbering exit_reason, only check for signals if
 415                  * we aren't already exiting to userspace for some other
 416                  * reason. */
 417                 if (signal_pending(current)) {
 418                         run->exit_reason = KVM_EXIT_INTR;
 419                         r = (-EINTR << 2) | RESUME_HOST | (r & RESUME_FLAG_NV);
 420
 421                         vcpu->stat.signal_exits++;
 422                 } else {
 423                         vcpu->stat.light_exits++;
 424                 }
 425         } else {
 426                 switch (run->exit_reason) {
 427                 case KVM_EXIT_MMIO:
 428                         vcpu->stat.mmio_exits++;
 429                         break;
 430                 case KVM_EXIT_DCR:
 431                         vcpu->stat.dcr_exits++;
 432                         break;
 433                 case KVM_EXIT_INTR:
 434                         vcpu->stat.signal_exits++;
 435                         break;
 436                 }
 437         }
 438
 439         return r;
 440 }
 441
 442 /* Initial guest state: 16MB mapping 0 -> 0, PC = 0, MSR = 0, R1 = 16MB */
 443 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
 444 {
 445         struct kvmppc_44x_tlbe *tlbe = &vcpu->arch.guest_tlb[0];
 446
 447         tlbe->tid = 0;
 448         tlbe->word0 = PPC44x_TLB_16M | PPC44x_TLB_VALID;
 449         tlbe->word1 = 0;
 450         tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR;
 451
 452         tlbe++;
 453         tlbe->tid = 0;
 454         tlbe->word0 = 0xef600000 | PPC44x_TLB_4K | PPC44x_TLB_VALID;
 455         tlbe->word1 = 0xef600000;
 456         tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR
 457                       | PPC44x_TLB_I | PPC44x_TLB_G;
 458
 459         vcpu->arch.pc = 0;
 460         vcpu->arch.msr = 0;
 461         vcpu->arch.gpr[1] = (16<<20) - 8; /* -8 for the callee-save LR slot */
 462
 463         vcpu->arch.shadow_pid = 1;
 464
 465         /* Eye-catching number so we know if the guest takes an interrupt
 466          * before it's programmed its own IVPR. */
 467         vcpu->arch.ivpr = 0x55550000;
 468
 469         /* Since the guest can directly access the timebase, it must know the
 470          * real timebase frequency. Accordingly, it must see the state of
 471          * CCR1[TCS]. */
 472         vcpu->arch.ccr1 = mfspr(SPRN_CCR1);
 473
 474         return 0;
 475 }
 476
 477 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 478 {
 479         int i;
 480
 481         regs->pc = vcpu->arch.pc;
 482         regs->cr = vcpu->arch.cr;
 483         regs->ctr = vcpu->arch.ctr;
 484         regs->lr = vcpu->arch.lr;
 485         regs->xer = vcpu->arch.xer;
 486         regs->msr = vcpu->arch.msr;
 487         regs->srr0 = vcpu->arch.srr0;
 488         regs->srr1 = vcpu->arch.srr1;
 489         regs->pid = vcpu->arch.pid;
 490         regs->sprg0 = vcpu->arch.sprg0;
 491         regs->sprg1 = vcpu->arch.sprg1;
 492         regs->sprg2 = vcpu->arch.sprg2;
 493         regs->sprg3 = vcpu->arch.sprg3;
 494         regs->sprg5 = vcpu->arch.sprg4;
 495         regs->sprg6 = vcpu->arch.sprg5;
 496         regs->sprg7 = vcpu->arch.sprg6;
 497
 498         for (i = 0; i < ARRAY_SIZE(regs->gpr); i++)
 499                 regs->gpr[i] = vcpu->arch.gpr[i];
 500
 501         return 0;
 502 }
 503
 504 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 505 {
 506         int i;
 507
 508         vcpu->arch.pc = regs->pc;
 509         vcpu->arch.cr = regs->cr;
 510         vcpu->arch.ctr = regs->ctr;
 511         vcpu->arch.lr = regs->lr;
 512         vcpu->arch.xer = regs->xer;
 513         vcpu->arch.msr = regs->msr;
 514         vcpu->arch.srr0 = regs->srr0;
 515         vcpu->arch.srr1 = regs->srr1;
 516         vcpu->arch.sprg0 = regs->sprg0;
 517         vcpu->arch.sprg1 = regs->sprg1;
 518         vcpu->arch.sprg2 = regs->sprg2;
 519         vcpu->arch.sprg3 = regs->sprg3;
 520         vcpu->arch.sprg5 = regs->sprg4;
 521         vcpu->arch.sprg6 = regs->sprg5;
 522         vcpu->arch.sprg7 = regs->sprg6;
 523
 524         for (i = 0; i < ARRAY_SIZE(vcpu->arch.gpr); i++)
 525                 vcpu->arch.gpr[i] = regs->gpr[i];
 526
 527         return 0;
 528 }
 529
 530 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 531                                   struct kvm_sregs *sregs)
 532 {
 533         return -ENOTSUPP;
 534 }
 535
 536 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 537                                   struct kvm_sregs *sregs)
 538 {
 539         return -ENOTSUPP;
 540 }
 541
 542 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 543 {
 544         return -ENOTSUPP;
 545 }
 546
 547 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 548 {
 549         return -ENOTSUPP;
 550 }
 551
 552 /* 'linear_address' is actually an encoding of AS|PID|EADDR . */
 553 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 554                                   struct kvm_translation *tr)
 555 {
 556         struct kvmppc_44x_tlbe *gtlbe;
 557         int index;
 558         gva_t eaddr;
 559         u8 pid;
 560         u8 as;
 561
 562         eaddr = tr->linear_address;
 563         pid = (tr->linear_address >> 32) & 0xff;
 564         as = (tr->linear_address >> 40) & 0x1;
 565
 566         index = kvmppc_44x_tlb_index(vcpu, eaddr, pid, as);
 567         if (index == -1) {
 568                 tr->valid = 0;
 569                 return 0;
 570         }
 571
 572         gtlbe = &vcpu->arch.guest_tlb[index];
 573
 574         tr->physical_address = tlb_xlate(gtlbe, eaddr);
 575         /* XXX what does "writeable" and "usermode" even mean? */
 576         tr->valid = 1;
 577
 578         return 0;
 579 }