err.no Git - linux-2.6/blob - 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         { NULL }
  53 };
  54
  55 static const u32 interrupt_msr_mask[16] = {
  56         [BOOKE_INTERRUPT_CRITICAL]      = MSR_ME,
  57         [BOOKE_INTERRUPT_MACHINE_CHECK] = 0,
  58         [BOOKE_INTERRUPT_DATA_STORAGE]  = MSR_CE|MSR_ME|MSR_DE,
  59         [BOOKE_INTERRUPT_INST_STORAGE]  = MSR_CE|MSR_ME|MSR_DE,
  60         [BOOKE_INTERRUPT_EXTERNAL]      = MSR_CE|MSR_ME|MSR_DE,
  61         [BOOKE_INTERRUPT_ALIGNMENT]     = MSR_CE|MSR_ME|MSR_DE,
  62         [BOOKE_INTERRUPT_PROGRAM]       = MSR_CE|MSR_ME|MSR_DE,
  63         [BOOKE_INTERRUPT_FP_UNAVAIL]    = MSR_CE|MSR_ME|MSR_DE,
  64         [BOOKE_INTERRUPT_SYSCALL]       = MSR_CE|MSR_ME|MSR_DE,
  65         [BOOKE_INTERRUPT_AP_UNAVAIL]    = MSR_CE|MSR_ME|MSR_DE,
  66         [BOOKE_INTERRUPT_DECREMENTER]   = MSR_CE|MSR_ME|MSR_DE,
  67         [BOOKE_INTERRUPT_FIT]           = MSR_CE|MSR_ME|MSR_DE,
  68         [BOOKE_INTERRUPT_WATCHDOG]      = MSR_ME,
  69         [BOOKE_INTERRUPT_DTLB_MISS]     = MSR_CE|MSR_ME|MSR_DE,
  70         [BOOKE_INTERRUPT_ITLB_MISS]     = MSR_CE|MSR_ME|MSR_DE,
  71         [BOOKE_INTERRUPT_DEBUG]         = MSR_ME,
  72 };
  73
  74 const unsigned char exception_priority[] = {
  75         [BOOKE_INTERRUPT_DATA_STORAGE] = 0,
  76         [BOOKE_INTERRUPT_INST_STORAGE] = 1,
  77         [BOOKE_INTERRUPT_ALIGNMENT] = 2,
  78         [BOOKE_INTERRUPT_PROGRAM] = 3,
  79         [BOOKE_INTERRUPT_FP_UNAVAIL] = 4,
  80         [BOOKE_INTERRUPT_SYSCALL] = 5,
  81         [BOOKE_INTERRUPT_AP_UNAVAIL] = 6,
  82         [BOOKE_INTERRUPT_DTLB_MISS] = 7,
  83         [BOOKE_INTERRUPT_ITLB_MISS] = 8,
  84         [BOOKE_INTERRUPT_MACHINE_CHECK] = 9,
  85         [BOOKE_INTERRUPT_DEBUG] = 10,
  86         [BOOKE_INTERRUPT_CRITICAL] = 11,
  87         [BOOKE_INTERRUPT_WATCHDOG] = 12,
  88         [BOOKE_INTERRUPT_EXTERNAL] = 13,
  89         [BOOKE_INTERRUPT_FIT] = 14,
  90         [BOOKE_INTERRUPT_DECREMENTER] = 15,
  91 };
  92
  93 const unsigned char priority_exception[] = {
  94         BOOKE_INTERRUPT_DATA_STORAGE,
  95         BOOKE_INTERRUPT_INST_STORAGE,
  96         BOOKE_INTERRUPT_ALIGNMENT,
  97         BOOKE_INTERRUPT_PROGRAM,
  98         BOOKE_INTERRUPT_FP_UNAVAIL,
  99         BOOKE_INTERRUPT_SYSCALL,
 100         BOOKE_INTERRUPT_AP_UNAVAIL,
 101         BOOKE_INTERRUPT_DTLB_MISS,
 102         BOOKE_INTERRUPT_ITLB_MISS,
 103         BOOKE_INTERRUPT_MACHINE_CHECK,
 104         BOOKE_INTERRUPT_DEBUG,
 105         BOOKE_INTERRUPT_CRITICAL,
 106         BOOKE_INTERRUPT_WATCHDOG,
 107         BOOKE_INTERRUPT_EXTERNAL,
 108         BOOKE_INTERRUPT_FIT,
 109         BOOKE_INTERRUPT_DECREMENTER,
 110 };
 111
 112
 113 void kvmppc_dump_tlbs(struct kvm_vcpu *vcpu)
 114 {
 115         struct tlbe *tlbe;
 116         int i;
 117
 118         printk("vcpu %d TLB dump:\n", vcpu->vcpu_id);
 119         printk("| %2s | %3s | %8s | %8s | %8s |\n",
 120                         "nr", "tid", "word0", "word1", "word2");
 121
 122         for (i = 0; i < PPC44x_TLB_SIZE; i++) {
 123                 tlbe = &vcpu->arch.guest_tlb[i];
 124                 if (tlbe->word0 & PPC44x_TLB_VALID)
 125                         printk(" G%2d |  %02X | %08X | %08X | %08X |\n",
 126                                i, tlbe->tid, tlbe->word0, tlbe->word1,
 127                                tlbe->word2);
 128         }
 129
 130         for (i = 0; i < PPC44x_TLB_SIZE; i++) {
 131                 tlbe = &vcpu->arch.shadow_tlb[i];
 132                 if (tlbe->word0 & PPC44x_TLB_VALID)
 133                         printk(" S%2d | %02X | %08X | %08X | %08X |\n",
 134                                i, tlbe->tid, tlbe->word0, tlbe->word1,
 135                                tlbe->word2);
 136         }
 137 }
 138
 139 /* TODO: use vcpu_printf() */
 140 void kvmppc_dump_vcpu(struct kvm_vcpu *vcpu)
 141 {
 142         int i;
 143
 144         printk("pc:   %08x msr:  %08x\n", vcpu->arch.pc, vcpu->arch.msr);
 145         printk("lr:   %08x ctr:  %08x\n", vcpu->arch.lr, vcpu->arch.ctr);
 146         printk("srr0: %08x srr1: %08x\n", vcpu->arch.srr0, vcpu->arch.srr1);
 147
 148         printk("exceptions: %08lx\n", vcpu->arch.pending_exceptions);
 149
 150         for (i = 0; i < 32; i += 4) {
 151                 printk("gpr%02d: %08x %08x %08x %08x\n", i,
 152                        vcpu->arch.gpr[i],
 153                        vcpu->arch.gpr[i+1],
 154                        vcpu->arch.gpr[i+2],
 155                        vcpu->arch.gpr[i+3]);
 156         }
 157 }
 158
 159 /* Check if we are ready to deliver the interrupt */
 160 static int kvmppc_can_deliver_interrupt(struct kvm_vcpu *vcpu, int interrupt)
 161 {
 162         int r;
 163
 164         switch (interrupt) {
 165         case BOOKE_INTERRUPT_CRITICAL:
 166                 r = vcpu->arch.msr & MSR_CE;
 167                 break;
 168         case BOOKE_INTERRUPT_MACHINE_CHECK:
 169                 r = vcpu->arch.msr & MSR_ME;
 170                 break;
 171         case BOOKE_INTERRUPT_EXTERNAL:
 172                 r = vcpu->arch.msr & MSR_EE;
 173                 break;
 174         case BOOKE_INTERRUPT_DECREMENTER:
 175                 r = vcpu->arch.msr & MSR_EE;
 176                 break;
 177         case BOOKE_INTERRUPT_FIT:
 178                 r = vcpu->arch.msr & MSR_EE;
 179                 break;
 180         case BOOKE_INTERRUPT_WATCHDOG:
 181                 r = vcpu->arch.msr & MSR_CE;
 182                 break;
 183         case BOOKE_INTERRUPT_DEBUG:
 184                 r = vcpu->arch.msr & MSR_DE;
 185                 break;
 186         default:
 187                 r = 1;
 188         }
 189
 190         return r;
 191 }
 192
 193 static void kvmppc_deliver_interrupt(struct kvm_vcpu *vcpu, int interrupt)
 194 {
 195         switch (interrupt) {
 196         case BOOKE_INTERRUPT_DECREMENTER:
 197                 vcpu->arch.tsr |= TSR_DIS;
 198                 break;
 199         }
 200
 201         vcpu->arch.srr0 = vcpu->arch.pc;
 202         vcpu->arch.srr1 = vcpu->arch.msr;
 203         vcpu->arch.pc = vcpu->arch.ivpr | vcpu->arch.ivor[interrupt];
 204         kvmppc_set_msr(vcpu, vcpu->arch.msr & interrupt_msr_mask[interrupt]);
 205 }
 206
 207 /* Check pending exceptions and deliver one, if possible. */
 208 void kvmppc_check_and_deliver_interrupts(struct kvm_vcpu *vcpu)
 209 {
 210         unsigned long *pending = &vcpu->arch.pending_exceptions;
 211         unsigned int exception;
 212         unsigned int priority;
 213
 214         priority = find_first_bit(pending, BITS_PER_BYTE * sizeof(*pending));
 215         while (priority <= BOOKE_MAX_INTERRUPT) {
 216                 exception = priority_exception[priority];
 217                 if (kvmppc_can_deliver_interrupt(vcpu, exception)) {
 218                         kvmppc_clear_exception(vcpu, exception);
 219                         kvmppc_deliver_interrupt(vcpu, exception);
 220                         break;
 221                 }
 222
 223                 priority = find_next_bit(pending,
 224                                          BITS_PER_BYTE * sizeof(*pending),
 225                                          priority + 1);
 226         }
 227 }
 228
 229 static int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
 230 {
 231         enum emulation_result er;
 232         int r;
 233
 234         er = kvmppc_emulate_instruction(run, vcpu);
 235         switch (er) {
 236         case EMULATE_DONE:
 237                 /* Future optimization: only reload non-volatiles if they were
 238                  * actually modified. */
 239                 r = RESUME_GUEST_NV;
 240                 break;
 241         case EMULATE_DO_MMIO:
 242                 run->exit_reason = KVM_EXIT_MMIO;
 243                 /* We must reload nonvolatiles because "update" load/store
 244                  * instructions modify register state. */
 245                 /* Future optimization: only reload non-volatiles if they were
 246                  * actually modified. */
 247                 r = RESUME_HOST_NV;
 248                 break;
 249         case EMULATE_FAIL:
 250                 /* XXX Deliver Program interrupt to guest. */
 251                 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
 252                        vcpu->arch.last_inst);
 253                 r = RESUME_HOST;
 254                 break;
 255         default:
 256                 BUG();
 257         }
 258
 259         return r;
 260 }
 261
 262 /**
 263  * kvmppc_handle_exit
 264  *
 265  * Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV)
 266  */
 267 int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
 268                        unsigned int exit_nr)
 269 {
 270         enum emulation_result er;
 271         int r = RESUME_HOST;
 272
 273         local_irq_enable();
 274
 275         run->exit_reason = KVM_EXIT_UNKNOWN;
 276         run->ready_for_interrupt_injection = 1;
 277
 278         switch (exit_nr) {
 279         case BOOKE_INTERRUPT_MACHINE_CHECK:
 280                 printk("MACHINE CHECK: %lx\n", mfspr(SPRN_MCSR));
 281                 kvmppc_dump_vcpu(vcpu);
 282                 r = RESUME_HOST;
 283                 break;
 284
 285         case BOOKE_INTERRUPT_EXTERNAL:
 286         case BOOKE_INTERRUPT_DECREMENTER:
 287                 /* Since we switched IVPR back to the host's value, the host
 288                  * handled this interrupt the moment we enabled interrupts.
 289                  * Now we just offer it a chance to reschedule the guest. */
 290
 291                 /* XXX At this point the TLB still holds our shadow TLB, so if
 292                  * we do reschedule the host will fault over it. Perhaps we
 293                  * should politely restore the host's entries to minimize
 294                  * misses before ceding control. */
 295                 if (need_resched())
 296                         cond_resched();
 297                 if (exit_nr == BOOKE_INTERRUPT_DECREMENTER)
 298                         vcpu->stat.dec_exits++;
 299                 else
 300                         vcpu->stat.ext_intr_exits++;
 301                 r = RESUME_GUEST;
 302                 break;
 303
 304         case BOOKE_INTERRUPT_PROGRAM:
 305                 if (vcpu->arch.msr & MSR_PR) {
 306                         /* Program traps generated by user-level software must be handled
 307                          * by the guest kernel. */
 308                         vcpu->arch.esr = vcpu->arch.fault_esr;
 309                         kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_PROGRAM);
 310                         r = RESUME_GUEST;
 311                         break;
 312                 }
 313
 314                 er = kvmppc_emulate_instruction(run, vcpu);
 315                 switch (er) {
 316                 case EMULATE_DONE:
 317                         /* Future optimization: only reload non-volatiles if
 318                          * they were actually modified by emulation. */
 319                         vcpu->stat.emulated_inst_exits++;
 320                         r = RESUME_GUEST_NV;
 321                         break;
 322                 case EMULATE_DO_DCR:
 323                         run->exit_reason = KVM_EXIT_DCR;
 324                         r = RESUME_HOST;
 325                         break;
 326                 case EMULATE_FAIL:
 327                         /* XXX Deliver Program interrupt to guest. */
 328                         printk(KERN_CRIT "%s: emulation at %x failed (%08x)\n",
 329                                __func__, vcpu->arch.pc, vcpu->arch.last_inst);
 330                         /* For debugging, encode the failing instruction and
 331                          * report it to userspace. */
 332                         run->hw.hardware_exit_reason = ~0ULL << 32;
 333                         run->hw.hardware_exit_reason |= vcpu->arch.last_inst;
 334                         r = RESUME_HOST;
 335                         break;
 336                 default:
 337                         BUG();
 338                 }
 339                 break;
 340
 341         case BOOKE_INTERRUPT_DATA_STORAGE:
 342                 vcpu->arch.dear = vcpu->arch.fault_dear;
 343                 vcpu->arch.esr = vcpu->arch.fault_esr;
 344                 kvmppc_queue_exception(vcpu, exit_nr);
 345                 vcpu->stat.dsi_exits++;
 346                 r = RESUME_GUEST;
 347                 break;
 348
 349         case BOOKE_INTERRUPT_INST_STORAGE:
 350                 vcpu->arch.esr = vcpu->arch.fault_esr;
 351                 kvmppc_queue_exception(vcpu, exit_nr);
 352                 vcpu->stat.isi_exits++;
 353                 r = RESUME_GUEST;
 354                 break;
 355
 356         case BOOKE_INTERRUPT_SYSCALL:
 357                 kvmppc_queue_exception(vcpu, exit_nr);
 358                 vcpu->stat.syscall_exits++;
 359                 r = RESUME_GUEST;
 360                 break;
 361
 362         case BOOKE_INTERRUPT_DTLB_MISS: {
 363                 struct tlbe *gtlbe;
 364                 unsigned long eaddr = vcpu->arch.fault_dear;
 365                 gfn_t gfn;
 366
 367                 /* Check the guest TLB. */
 368                 gtlbe = kvmppc_44x_dtlb_search(vcpu, eaddr);
 369                 if (!gtlbe) {
 370                         /* The guest didn't have a mapping for it. */
 371                         kvmppc_queue_exception(vcpu, exit_nr);
 372                         vcpu->arch.dear = vcpu->arch.fault_dear;
 373                         vcpu->arch.esr = vcpu->arch.fault_esr;
 374                         vcpu->stat.dtlb_real_miss_exits++;
 375                         r = RESUME_GUEST;
 376                         break;
 377                 }
 378
 379                 vcpu->arch.paddr_accessed = tlb_xlate(gtlbe, eaddr);
 380                 gfn = vcpu->arch.paddr_accessed >> PAGE_SHIFT;
 381
 382                 if (kvm_is_visible_gfn(vcpu->kvm, gfn)) {
 383                         /* The guest TLB had a mapping, but the shadow TLB
 384                          * didn't, and it is RAM. This could be because:
 385                          * a) the entry is mapping the host kernel, or
 386                          * b) the guest used a large mapping which we're faking
 387                          * Either way, we need to satisfy the fault without
 388                          * invoking the guest. */
 389                         kvmppc_mmu_map(vcpu, eaddr, gfn, gtlbe->tid,
 390                                        gtlbe->word2);
 391                         vcpu->stat.dtlb_virt_miss_exits++;
 392                         r = RESUME_GUEST;
 393                 } else {
 394                         /* Guest has mapped and accessed a page which is not
 395                          * actually RAM. */
 396                         r = kvmppc_emulate_mmio(run, vcpu);
 397                 }
 398
 399                 break;
 400         }
 401
 402         case BOOKE_INTERRUPT_ITLB_MISS: {
 403                 struct tlbe *gtlbe;
 404                 unsigned long eaddr = vcpu->arch.pc;
 405                 gfn_t gfn;
 406
 407                 r = RESUME_GUEST;
 408
 409                 /* Check the guest TLB. */
 410                 gtlbe = kvmppc_44x_itlb_search(vcpu, eaddr);
 411                 if (!gtlbe) {
 412                         /* The guest didn't have a mapping for it. */
 413                         kvmppc_queue_exception(vcpu, exit_nr);
 414                         vcpu->stat.itlb_real_miss_exits++;
 415                         break;
 416                 }
 417
 418                 vcpu->stat.itlb_virt_miss_exits++;
 419
 420                 gfn = tlb_xlate(gtlbe, eaddr) >> PAGE_SHIFT;
 421
 422                 if (kvm_is_visible_gfn(vcpu->kvm, gfn)) {
 423                         /* The guest TLB had a mapping, but the shadow TLB
 424                          * didn't. This could be because:
 425                          * a) the entry is mapping the host kernel, or
 426                          * b) the guest used a large mapping which we're faking
 427                          * Either way, we need to satisfy the fault without
 428                          * invoking the guest. */
 429                         kvmppc_mmu_map(vcpu, eaddr, gfn, gtlbe->tid,
 430                                        gtlbe->word2);
 431                 } else {
 432                         /* Guest mapped and leaped at non-RAM! */
 433                         kvmppc_queue_exception(vcpu,
 434                                                BOOKE_INTERRUPT_MACHINE_CHECK);
 435                 }
 436
 437                 break;
 438         }
 439
 440         default:
 441                 printk(KERN_EMERG "exit_nr %d\n", exit_nr);
 442                 BUG();
 443         }
 444
 445         local_irq_disable();
 446
 447         kvmppc_check_and_deliver_interrupts(vcpu);
 448
 449         /* Do some exit accounting. */
 450         vcpu->stat.sum_exits++;
 451         if (!(r & RESUME_HOST)) {
 452                 /* To avoid clobbering exit_reason, only check for signals if
 453                  * we aren't already exiting to userspace for some other
 454                  * reason. */
 455                 if (signal_pending(current)) {
 456                         run->exit_reason = KVM_EXIT_INTR;
 457                         r = (-EINTR << 2) | RESUME_HOST | (r & RESUME_FLAG_NV);
 458
 459                         vcpu->stat.signal_exits++;
 460                 } else {
 461                         vcpu->stat.light_exits++;
 462                 }
 463         } else {
 464                 switch (run->exit_reason) {
 465                 case KVM_EXIT_MMIO:
 466                         vcpu->stat.mmio_exits++;
 467                         break;
 468                 case KVM_EXIT_DCR:
 469                         vcpu->stat.dcr_exits++;
 470                         break;
 471                 case KVM_EXIT_INTR:
 472                         vcpu->stat.signal_exits++;
 473                         break;
 474                 }
 475         }
 476
 477         return r;
 478 }
 479
 480 /* Initial guest state: 16MB mapping 0 -> 0, PC = 0, MSR = 0, R1 = 16MB */
 481 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
 482 {
 483         struct tlbe *tlbe = &vcpu->arch.guest_tlb[0];
 484
 485         tlbe->tid = 0;
 486         tlbe->word0 = PPC44x_TLB_16M | PPC44x_TLB_VALID;
 487         tlbe->word1 = 0;
 488         tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR;
 489
 490         tlbe++;
 491         tlbe->tid = 0;
 492         tlbe->word0 = 0xef600000 | PPC44x_TLB_4K | PPC44x_TLB_VALID;
 493         tlbe->word1 = 0xef600000;
 494         tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR
 495                       | PPC44x_TLB_I | PPC44x_TLB_G;
 496
 497         vcpu->arch.pc = 0;
 498         vcpu->arch.msr = 0;
 499         vcpu->arch.gpr[1] = (16<<20) - 8; /* -8 for the callee-save LR slot */
 500
 501         /* Eye-catching number so we know if the guest takes an interrupt
 502          * before it's programmed its own IVPR. */
 503         vcpu->arch.ivpr = 0x55550000;
 504
 505         /* Since the guest can directly access the timebase, it must know the
 506          * real timebase frequency. Accordingly, it must see the state of
 507          * CCR1[TCS]. */
 508         vcpu->arch.ccr1 = mfspr(SPRN_CCR1);
 509
 510         return 0;
 511 }
 512
 513 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 514 {
 515         int i;
 516
 517         regs->pc = vcpu->arch.pc;
 518         regs->cr = vcpu->arch.cr;
 519         regs->ctr = vcpu->arch.ctr;
 520         regs->lr = vcpu->arch.lr;
 521         regs->xer = vcpu->arch.xer;
 522         regs->msr = vcpu->arch.msr;
 523         regs->srr0 = vcpu->arch.srr0;
 524         regs->srr1 = vcpu->arch.srr1;
 525         regs->pid = vcpu->arch.pid;
 526         regs->sprg0 = vcpu->arch.sprg0;
 527         regs->sprg1 = vcpu->arch.sprg1;
 528         regs->sprg2 = vcpu->arch.sprg2;
 529         regs->sprg3 = vcpu->arch.sprg3;
 530         regs->sprg5 = vcpu->arch.sprg4;
 531         regs->sprg6 = vcpu->arch.sprg5;
 532         regs->sprg7 = vcpu->arch.sprg6;
 533
 534         for (i = 0; i < ARRAY_SIZE(regs->gpr); i++)
 535                 regs->gpr[i] = vcpu->arch.gpr[i];
 536
 537         return 0;
 538 }
 539
 540 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 541 {
 542         int i;
 543
 544         vcpu->arch.pc = regs->pc;
 545         vcpu->arch.cr = regs->cr;
 546         vcpu->arch.ctr = regs->ctr;
 547         vcpu->arch.lr = regs->lr;
 548         vcpu->arch.xer = regs->xer;
 549         vcpu->arch.msr = regs->msr;
 550         vcpu->arch.srr0 = regs->srr0;
 551         vcpu->arch.srr1 = regs->srr1;
 552         vcpu->arch.sprg0 = regs->sprg0;
 553         vcpu->arch.sprg1 = regs->sprg1;
 554         vcpu->arch.sprg2 = regs->sprg2;
 555         vcpu->arch.sprg3 = regs->sprg3;
 556         vcpu->arch.sprg5 = regs->sprg4;
 557         vcpu->arch.sprg6 = regs->sprg5;
 558         vcpu->arch.sprg7 = regs->sprg6;
 559
 560         for (i = 0; i < ARRAY_SIZE(vcpu->arch.gpr); i++)
 561                 vcpu->arch.gpr[i] = regs->gpr[i];
 562
 563         return 0;
 564 }
 565
 566 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 567                                   struct kvm_sregs *sregs)
 568 {
 569         return -ENOTSUPP;
 570 }
 571
 572 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 573                                   struct kvm_sregs *sregs)
 574 {
 575         return -ENOTSUPP;
 576 }
 577
 578 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 579 {
 580         return -ENOTSUPP;
 581 }
 582
 583 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 584 {
 585         return -ENOTSUPP;
 586 }
 587
 588 /* 'linear_address' is actually an encoding of AS|PID|EADDR . */
 589 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 590                                   struct kvm_translation *tr)
 591 {
 592         struct tlbe *gtlbe;
 593         int index;
 594         gva_t eaddr;
 595         u8 pid;
 596         u8 as;
 597
 598         eaddr = tr->linear_address;
 599         pid = (tr->linear_address >> 32) & 0xff;
 600         as = (tr->linear_address >> 40) & 0x1;
 601
 602         index = kvmppc_44x_tlb_index(vcpu, eaddr, pid, as);
 603         if (index == -1) {
 604                 tr->valid = 0;
 605                 return 0;
 606         }
 607
 608         gtlbe = &vcpu->arch.guest_tlb[index];
 609
 610         tr->physical_address = tlb_xlate(gtlbe, eaddr);
 611         /* XXX what does "writeable" and "usermode" even mean? */
 612         tr->valid = 1;
 613
 614         return 0;
 615 }