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         { "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 void kvmppc_dump_tlbs(struct kvm_vcpu *vcpu)
 115 {
 116         struct tlbe *tlbe;
 117         int i;
 118
 119         printk("vcpu %d TLB dump:\n", vcpu->vcpu_id);
 120         printk("| %2s | %3s | %8s | %8s | %8s |\n",
 121                         "nr", "tid", "word0", "word1", "word2");
 122
 123         for (i = 0; i < PPC44x_TLB_SIZE; i++) {
 124                 tlbe = &vcpu->arch.guest_tlb[i];
 125                 if (tlbe->word0 & PPC44x_TLB_VALID)
 126                         printk(" G%2d |  %02X | %08X | %08X | %08X |\n",
 127                                i, tlbe->tid, tlbe->word0, tlbe->word1,
 128                                tlbe->word2);
 129         }
 130
 131         for (i = 0; i < PPC44x_TLB_SIZE; i++) {
 132                 tlbe = &vcpu->arch.shadow_tlb[i];
 133                 if (tlbe->word0 & PPC44x_TLB_VALID)
 134                         printk(" S%2d | %02X | %08X | %08X | %08X |\n",
 135                                i, tlbe->tid, tlbe->word0, tlbe->word1,
 136                                tlbe->word2);
 137         }
 138 }
 139
 140 /* TODO: use vcpu_printf() */
 141 void kvmppc_dump_vcpu(struct kvm_vcpu *vcpu)
 142 {
 143         int i;
 144
 145         printk("pc:   %08x msr:  %08x\n", vcpu->arch.pc, vcpu->arch.msr);
 146         printk("lr:   %08x ctr:  %08x\n", vcpu->arch.lr, vcpu->arch.ctr);
 147         printk("srr0: %08x srr1: %08x\n", vcpu->arch.srr0, vcpu->arch.srr1);
 148
 149         printk("exceptions: %08lx\n", vcpu->arch.pending_exceptions);
 150
 151         for (i = 0; i < 32; i += 4) {
 152                 printk("gpr%02d: %08x %08x %08x %08x\n", i,
 153                        vcpu->arch.gpr[i],
 154                        vcpu->arch.gpr[i+1],
 155                        vcpu->arch.gpr[i+2],
 156                        vcpu->arch.gpr[i+3]);
 157         }
 158 }
 159
 160 /* Check if we are ready to deliver the interrupt */
 161 static int kvmppc_can_deliver_interrupt(struct kvm_vcpu *vcpu, int interrupt)
 162 {
 163         int r;
 164
 165         switch (interrupt) {
 166         case BOOKE_INTERRUPT_CRITICAL:
 167                 r = vcpu->arch.msr & MSR_CE;
 168                 break;
 169         case BOOKE_INTERRUPT_MACHINE_CHECK:
 170                 r = vcpu->arch.msr & MSR_ME;
 171                 break;
 172         case BOOKE_INTERRUPT_EXTERNAL:
 173                 r = vcpu->arch.msr & MSR_EE;
 174                 break;
 175         case BOOKE_INTERRUPT_DECREMENTER:
 176                 r = vcpu->arch.msr & MSR_EE;
 177                 break;
 178         case BOOKE_INTERRUPT_FIT:
 179                 r = vcpu->arch.msr & MSR_EE;
 180                 break;
 181         case BOOKE_INTERRUPT_WATCHDOG:
 182                 r = vcpu->arch.msr & MSR_CE;
 183                 break;
 184         case BOOKE_INTERRUPT_DEBUG:
 185                 r = vcpu->arch.msr & MSR_DE;
 186                 break;
 187         default:
 188                 r = 1;
 189         }
 190
 191         return r;
 192 }
 193
 194 static void kvmppc_deliver_interrupt(struct kvm_vcpu *vcpu, int interrupt)
 195 {
 196         switch (interrupt) {
 197         case BOOKE_INTERRUPT_DECREMENTER:
 198                 vcpu->arch.tsr |= TSR_DIS;
 199                 break;
 200         }
 201
 202         vcpu->arch.srr0 = vcpu->arch.pc;
 203         vcpu->arch.srr1 = vcpu->arch.msr;
 204         vcpu->arch.pc = vcpu->arch.ivpr | vcpu->arch.ivor[interrupt];
 205         kvmppc_set_msr(vcpu, vcpu->arch.msr & interrupt_msr_mask[interrupt]);
 206 }
 207
 208 /* Check pending exceptions and deliver one, if possible. */
 209 void kvmppc_check_and_deliver_interrupts(struct kvm_vcpu *vcpu)
 210 {
 211         unsigned long *pending = &vcpu->arch.pending_exceptions;
 212         unsigned int exception;
 213         unsigned int priority;
 214
 215         priority = find_first_bit(pending, BITS_PER_BYTE * sizeof(*pending));
 216         while (priority <= BOOKE_MAX_INTERRUPT) {
 217                 exception = priority_exception[priority];
 218                 if (kvmppc_can_deliver_interrupt(vcpu, exception)) {
 219                         kvmppc_clear_exception(vcpu, exception);
 220                         kvmppc_deliver_interrupt(vcpu, exception);
 221                         break;
 222                 }
 223
 224                 priority = find_next_bit(pending,
 225                                          BITS_PER_BYTE * sizeof(*pending),
 226                                          priority + 1);
 227         }
 228 }
 229
 230 static int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
 231 {
 232         enum emulation_result er;
 233         int r;
 234
 235         er = kvmppc_emulate_instruction(run, vcpu);
 236         switch (er) {
 237         case EMULATE_DONE:
 238                 /* Future optimization: only reload non-volatiles if they were
 239                  * actually modified. */
 240                 r = RESUME_GUEST_NV;
 241                 break;
 242         case EMULATE_DO_MMIO:
 243                 run->exit_reason = KVM_EXIT_MMIO;
 244                 /* We must reload nonvolatiles because "update" load/store
 245                  * instructions modify register state. */
 246                 /* Future optimization: only reload non-volatiles if they were
 247                  * actually modified. */
 248                 r = RESUME_HOST_NV;
 249                 break;
 250         case EMULATE_FAIL:
 251                 /* XXX Deliver Program interrupt to guest. */
 252                 printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
 253                        vcpu->arch.last_inst);
 254                 r = RESUME_HOST;
 255                 break;
 256         default:
 257                 BUG();
 258         }
 259
 260         return r;
 261 }
 262
 263 /**
 264  * kvmppc_handle_exit
 265  *
 266  * Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV)
 267  */
 268 int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
 269                        unsigned int exit_nr)
 270 {
 271         enum emulation_result er;
 272         int r = RESUME_HOST;
 273
 274         local_irq_enable();
 275
 276         run->exit_reason = KVM_EXIT_UNKNOWN;
 277         run->ready_for_interrupt_injection = 1;
 278
 279         switch (exit_nr) {
 280         case BOOKE_INTERRUPT_MACHINE_CHECK:
 281                 printk("MACHINE CHECK: %lx\n", mfspr(SPRN_MCSR));
 282                 kvmppc_dump_vcpu(vcpu);
 283                 r = RESUME_HOST;
 284                 break;
 285
 286         case BOOKE_INTERRUPT_EXTERNAL:
 287         case BOOKE_INTERRUPT_DECREMENTER:
 288                 /* Since we switched IVPR back to the host's value, the host
 289                  * handled this interrupt the moment we enabled interrupts.
 290                  * Now we just offer it a chance to reschedule the guest. */
 291
 292                 /* XXX At this point the TLB still holds our shadow TLB, so if
 293                  * we do reschedule the host will fault over it. Perhaps we
 294                  * should politely restore the host's entries to minimize
 295                  * misses before ceding control. */
 296                 if (need_resched())
 297                         cond_resched();
 298                 if (exit_nr == BOOKE_INTERRUPT_DECREMENTER)
 299                         vcpu->stat.dec_exits++;
 300                 else
 301                         vcpu->stat.ext_intr_exits++;
 302                 r = RESUME_GUEST;
 303                 break;
 304
 305         case BOOKE_INTERRUPT_PROGRAM:
 306                 if (vcpu->arch.msr & MSR_PR) {
 307                         /* Program traps generated by user-level software must be handled
 308                          * by the guest kernel. */
 309                         vcpu->arch.esr = vcpu->arch.fault_esr;
 310                         kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_PROGRAM);
 311                         r = RESUME_GUEST;
 312                         break;
 313                 }
 314
 315                 er = kvmppc_emulate_instruction(run, vcpu);
 316                 switch (er) {
 317                 case EMULATE_DONE:
 318                         /* Future optimization: only reload non-volatiles if
 319                          * they were actually modified by emulation. */
 320                         vcpu->stat.emulated_inst_exits++;
 321                         r = RESUME_GUEST_NV;
 322                         break;
 323                 case EMULATE_DO_DCR:
 324                         run->exit_reason = KVM_EXIT_DCR;
 325                         r = RESUME_HOST;
 326                         break;
 327                 case EMULATE_FAIL:
 328                         /* XXX Deliver Program interrupt to guest. */
 329                         printk(KERN_CRIT "%s: emulation at %x failed (%08x)\n",
 330                                __func__, vcpu->arch.pc, vcpu->arch.last_inst);
 331                         /* For debugging, encode the failing instruction and
 332                          * report it to userspace. */
 333                         run->hw.hardware_exit_reason = ~0ULL << 32;
 334                         run->hw.hardware_exit_reason |= vcpu->arch.last_inst;
 335                         r = RESUME_HOST;
 336                         break;
 337                 default:
 338                         BUG();
 339                 }
 340                 break;
 341
 342         case BOOKE_INTERRUPT_FP_UNAVAIL:
 343                 kvmppc_queue_exception(vcpu, exit_nr);
 344                 r = RESUME_GUEST;
 345                 break;
 346
 347         case BOOKE_INTERRUPT_DATA_STORAGE:
 348                 vcpu->arch.dear = vcpu->arch.fault_dear;
 349                 vcpu->arch.esr = vcpu->arch.fault_esr;
 350                 kvmppc_queue_exception(vcpu, exit_nr);
 351                 vcpu->stat.dsi_exits++;
 352                 r = RESUME_GUEST;
 353                 break;
 354
 355         case BOOKE_INTERRUPT_INST_STORAGE:
 356                 vcpu->arch.esr = vcpu->arch.fault_esr;
 357                 kvmppc_queue_exception(vcpu, exit_nr);
 358                 vcpu->stat.isi_exits++;
 359                 r = RESUME_GUEST;
 360                 break;
 361
 362         case BOOKE_INTERRUPT_SYSCALL:
 363                 kvmppc_queue_exception(vcpu, exit_nr);
 364                 vcpu->stat.syscall_exits++;
 365                 r = RESUME_GUEST;
 366                 break;
 367
 368         case BOOKE_INTERRUPT_DTLB_MISS: {
 369                 struct tlbe *gtlbe;
 370                 unsigned long eaddr = vcpu->arch.fault_dear;
 371                 gfn_t gfn;
 372
 373                 /* Check the guest TLB. */
 374                 gtlbe = kvmppc_44x_dtlb_search(vcpu, eaddr);
 375                 if (!gtlbe) {
 376                         /* The guest didn't have a mapping for it. */
 377                         kvmppc_queue_exception(vcpu, exit_nr);
 378                         vcpu->arch.dear = vcpu->arch.fault_dear;
 379                         vcpu->arch.esr = vcpu->arch.fault_esr;
 380                         vcpu->stat.dtlb_real_miss_exits++;
 381                         r = RESUME_GUEST;
 382                         break;
 383                 }
 384
 385                 vcpu->arch.paddr_accessed = tlb_xlate(gtlbe, eaddr);
 386                 gfn = vcpu->arch.paddr_accessed >> PAGE_SHIFT;
 387
 388                 if (kvm_is_visible_gfn(vcpu->kvm, gfn)) {
 389                         /* The guest TLB had a mapping, but the shadow TLB
 390                          * didn't, and it is RAM. This could be because:
 391                          * a) the entry is mapping the host kernel, or
 392                          * b) the guest used a large mapping which we're faking
 393                          * Either way, we need to satisfy the fault without
 394                          * invoking the guest. */
 395                         kvmppc_mmu_map(vcpu, eaddr, gfn, gtlbe->tid,
 396                                        gtlbe->word2);
 397                         vcpu->stat.dtlb_virt_miss_exits++;
 398                         r = RESUME_GUEST;
 399                 } else {
 400                         /* Guest has mapped and accessed a page which is not
 401                          * actually RAM. */
 402                         r = kvmppc_emulate_mmio(run, vcpu);
 403                 }
 404
 405                 break;
 406         }
 407
 408         case BOOKE_INTERRUPT_ITLB_MISS: {
 409                 struct tlbe *gtlbe;
 410                 unsigned long eaddr = vcpu->arch.pc;
 411                 gfn_t gfn;
 412
 413                 r = RESUME_GUEST;
 414
 415                 /* Check the guest TLB. */
 416                 gtlbe = kvmppc_44x_itlb_search(vcpu, eaddr);
 417                 if (!gtlbe) {
 418                         /* The guest didn't have a mapping for it. */
 419                         kvmppc_queue_exception(vcpu, exit_nr);
 420                         vcpu->stat.itlb_real_miss_exits++;
 421                         break;
 422                 }
 423
 424                 vcpu->stat.itlb_virt_miss_exits++;
 425
 426                 gfn = tlb_xlate(gtlbe, eaddr) >> PAGE_SHIFT;
 427
 428                 if (kvm_is_visible_gfn(vcpu->kvm, gfn)) {
 429                         /* The guest TLB had a mapping, but the shadow TLB
 430                          * didn't. This could be because:
 431                          * a) the entry is mapping the host kernel, or
 432                          * b) the guest used a large mapping which we're faking
 433                          * Either way, we need to satisfy the fault without
 434                          * invoking the guest. */
 435                         kvmppc_mmu_map(vcpu, eaddr, gfn, gtlbe->tid,
 436                                        gtlbe->word2);
 437                 } else {
 438                         /* Guest mapped and leaped at non-RAM! */
 439                         kvmppc_queue_exception(vcpu,
 440                                                BOOKE_INTERRUPT_MACHINE_CHECK);
 441                 }
 442
 443                 break;
 444         }
 445
 446         default:
 447                 printk(KERN_EMERG "exit_nr %d\n", exit_nr);
 448                 BUG();
 449         }
 450
 451         local_irq_disable();
 452
 453         kvmppc_check_and_deliver_interrupts(vcpu);
 454
 455         /* Do some exit accounting. */
 456         vcpu->stat.sum_exits++;
 457         if (!(r & RESUME_HOST)) {
 458                 /* To avoid clobbering exit_reason, only check for signals if
 459                  * we aren't already exiting to userspace for some other
 460                  * reason. */
 461                 if (signal_pending(current)) {
 462                         run->exit_reason = KVM_EXIT_INTR;
 463                         r = (-EINTR << 2) | RESUME_HOST | (r & RESUME_FLAG_NV);
 464
 465                         vcpu->stat.signal_exits++;
 466                 } else {
 467                         vcpu->stat.light_exits++;
 468                 }
 469         } else {
 470                 switch (run->exit_reason) {
 471                 case KVM_EXIT_MMIO:
 472                         vcpu->stat.mmio_exits++;
 473                         break;
 474                 case KVM_EXIT_DCR:
 475                         vcpu->stat.dcr_exits++;
 476                         break;
 477                 case KVM_EXIT_INTR:
 478                         vcpu->stat.signal_exits++;
 479                         break;
 480                 }
 481         }
 482
 483         return r;
 484 }
 485
 486 /* Initial guest state: 16MB mapping 0 -> 0, PC = 0, MSR = 0, R1 = 16MB */
 487 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
 488 {
 489         struct tlbe *tlbe = &vcpu->arch.guest_tlb[0];
 490
 491         tlbe->tid = 0;
 492         tlbe->word0 = PPC44x_TLB_16M | PPC44x_TLB_VALID;
 493         tlbe->word1 = 0;
 494         tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR;
 495
 496         tlbe++;
 497         tlbe->tid = 0;
 498         tlbe->word0 = 0xef600000 | PPC44x_TLB_4K | PPC44x_TLB_VALID;
 499         tlbe->word1 = 0xef600000;
 500         tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR
 501                       | PPC44x_TLB_I | PPC44x_TLB_G;
 502
 503         vcpu->arch.pc = 0;
 504         vcpu->arch.msr = 0;
 505         vcpu->arch.gpr[1] = (16<<20) - 8; /* -8 for the callee-save LR slot */
 506
 507         /* Eye-catching number so we know if the guest takes an interrupt
 508          * before it's programmed its own IVPR. */
 509         vcpu->arch.ivpr = 0x55550000;
 510
 511         /* Since the guest can directly access the timebase, it must know the
 512          * real timebase frequency. Accordingly, it must see the state of
 513          * CCR1[TCS]. */
 514         vcpu->arch.ccr1 = mfspr(SPRN_CCR1);
 515
 516         return 0;
 517 }
 518
 519 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 520 {
 521         int i;
 522
 523         regs->pc = vcpu->arch.pc;
 524         regs->cr = vcpu->arch.cr;
 525         regs->ctr = vcpu->arch.ctr;
 526         regs->lr = vcpu->arch.lr;
 527         regs->xer = vcpu->arch.xer;
 528         regs->msr = vcpu->arch.msr;
 529         regs->srr0 = vcpu->arch.srr0;
 530         regs->srr1 = vcpu->arch.srr1;
 531         regs->pid = vcpu->arch.pid;
 532         regs->sprg0 = vcpu->arch.sprg0;
 533         regs->sprg1 = vcpu->arch.sprg1;
 534         regs->sprg2 = vcpu->arch.sprg2;
 535         regs->sprg3 = vcpu->arch.sprg3;
 536         regs->sprg5 = vcpu->arch.sprg4;
 537         regs->sprg6 = vcpu->arch.sprg5;
 538         regs->sprg7 = vcpu->arch.sprg6;
 539
 540         for (i = 0; i < ARRAY_SIZE(regs->gpr); i++)
 541                 regs->gpr[i] = vcpu->arch.gpr[i];
 542
 543         return 0;
 544 }
 545
 546 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 547 {
 548         int i;
 549
 550         vcpu->arch.pc = regs->pc;
 551         vcpu->arch.cr = regs->cr;
 552         vcpu->arch.ctr = regs->ctr;
 553         vcpu->arch.lr = regs->lr;
 554         vcpu->arch.xer = regs->xer;
 555         vcpu->arch.msr = regs->msr;
 556         vcpu->arch.srr0 = regs->srr0;
 557         vcpu->arch.srr1 = regs->srr1;
 558         vcpu->arch.sprg0 = regs->sprg0;
 559         vcpu->arch.sprg1 = regs->sprg1;
 560         vcpu->arch.sprg2 = regs->sprg2;
 561         vcpu->arch.sprg3 = regs->sprg3;
 562         vcpu->arch.sprg5 = regs->sprg4;
 563         vcpu->arch.sprg6 = regs->sprg5;
 564         vcpu->arch.sprg7 = regs->sprg6;
 565
 566         for (i = 0; i < ARRAY_SIZE(vcpu->arch.gpr); i++)
 567                 vcpu->arch.gpr[i] = regs->gpr[i];
 568
 569         return 0;
 570 }
 571
 572 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 573                                   struct kvm_sregs *sregs)
 574 {
 575         return -ENOTSUPP;
 576 }
 577
 578 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 579                                   struct kvm_sregs *sregs)
 580 {
 581         return -ENOTSUPP;
 582 }
 583
 584 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 585 {
 586         return -ENOTSUPP;
 587 }
 588
 589 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 590 {
 591         return -ENOTSUPP;
 592 }
 593
 594 /* 'linear_address' is actually an encoding of AS|PID|EADDR . */
 595 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 596                                   struct kvm_translation *tr)
 597 {
 598         struct tlbe *gtlbe;
 599         int index;
 600         gva_t eaddr;
 601         u8 pid;
 602         u8 as;
 603
 604         eaddr = tr->linear_address;
 605         pid = (tr->linear_address >> 32) & 0xff;
 606         as = (tr->linear_address >> 40) & 0x1;
 607
 608         index = kvmppc_44x_tlb_index(vcpu, eaddr, pid, as);
 609         if (index == -1) {
 610                 tr->valid = 0;
 611                 return 0;
 612         }
 613
 614         gtlbe = &vcpu->arch.guest_tlb[index];
 615
 616         tr->physical_address = tlb_xlate(gtlbe, eaddr);
 617         /* XXX what does "writeable" and "usermode" even mean? */
 618         tr->valid = 1;
 619
 620         return 0;
 621 }