arch/powerpc/kvm/booke.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 #include <asm/cacheflush.h>
  31
  32 #include "44x_tlb.h"
  33
  34 unsigned long kvmppc_booke_handlers;
  35
  36 #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
  37 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
  38
  39 struct kvm_stats_debugfs_item debugfs_entries[] = {
  40         { "exits",      VCPU_STAT(sum_exits) },
  41         { "mmio",       VCPU_STAT(mmio_exits) },
  42         { "dcr",        VCPU_STAT(dcr_exits) },
  43         { "sig",        VCPU_STAT(signal_exits) },
  44         { "light",      VCPU_STAT(light_exits) },
  45         { "itlb_r",     VCPU_STAT(itlb_real_miss_exits) },
  46         { "itlb_v",     VCPU_STAT(itlb_virt_miss_exits) },
  47         { "dtlb_r",     VCPU_STAT(dtlb_real_miss_exits) },
  48         { "dtlb_v",     VCPU_STAT(dtlb_virt_miss_exits) },
  49         { "sysc",       VCPU_STAT(syscall_exits) },
  50         { "isi",        VCPU_STAT(isi_exits) },
  51         { "dsi",        VCPU_STAT(dsi_exits) },
  52         { "inst_emu",   VCPU_STAT(emulated_inst_exits) },
  53         { "dec",        VCPU_STAT(dec_exits) },
  54         { "ext_intr",   VCPU_STAT(ext_intr_exits) },
  55         { "halt_wakeup", VCPU_STAT(halt_wakeup) },
  56         { NULL }
  57 };
  58
  59 static const u32 interrupt_msr_mask[16] = {
  60         [BOOKE_INTERRUPT_CRITICAL]      = MSR_ME,
  61         [BOOKE_INTERRUPT_MACHINE_CHECK] = 0,
  62         [BOOKE_INTERRUPT_DATA_STORAGE]  = MSR_CE|MSR_ME|MSR_DE,
  63         [BOOKE_INTERRUPT_INST_STORAGE]  = MSR_CE|MSR_ME|MSR_DE,
  64         [BOOKE_INTERRUPT_EXTERNAL]      = MSR_CE|MSR_ME|MSR_DE,
  65         [BOOKE_INTERRUPT_ALIGNMENT]     = MSR_CE|MSR_ME|MSR_DE,
  66         [BOOKE_INTERRUPT_PROGRAM]       = MSR_CE|MSR_ME|MSR_DE,
  67         [BOOKE_INTERRUPT_FP_UNAVAIL]    = MSR_CE|MSR_ME|MSR_DE,
  68         [BOOKE_INTERRUPT_SYSCALL]       = MSR_CE|MSR_ME|MSR_DE,
  69         [BOOKE_INTERRUPT_AP_UNAVAIL]    = MSR_CE|MSR_ME|MSR_DE,
  70         [BOOKE_INTERRUPT_DECREMENTER]   = MSR_CE|MSR_ME|MSR_DE,
  71         [BOOKE_INTERRUPT_FIT]           = MSR_CE|MSR_ME|MSR_DE,
  72         [BOOKE_INTERRUPT_WATCHDOG]      = MSR_ME,
  73         [BOOKE_INTERRUPT_DTLB_MISS]     = MSR_CE|MSR_ME|MSR_DE,
  74         [BOOKE_INTERRUPT_ITLB_MISS]     = MSR_CE|MSR_ME|MSR_DE,
  75         [BOOKE_INTERRUPT_DEBUG]         = MSR_ME,
  76 };
  77
  78 const unsigned char exception_priority[] = {
  79         [BOOKE_INTERRUPT_DATA_STORAGE] = 0,
  80         [BOOKE_INTERRUPT_INST_STORAGE] = 1,
  81         [BOOKE_INTERRUPT_ALIGNMENT] = 2,
  82         [BOOKE_INTERRUPT_PROGRAM] = 3,
  83         [BOOKE_INTERRUPT_FP_UNAVAIL] = 4,
  84         [BOOKE_INTERRUPT_SYSCALL] = 5,
  85         [BOOKE_INTERRUPT_AP_UNAVAIL] = 6,
  86         [BOOKE_INTERRUPT_DTLB_MISS] = 7,
  87         [BOOKE_INTERRUPT_ITLB_MISS] = 8,
  88         [BOOKE_INTERRUPT_MACHINE_CHECK] = 9,
  89         [BOOKE_INTERRUPT_DEBUG] = 10,
  90         [BOOKE_INTERRUPT_CRITICAL] = 11,
  91         [BOOKE_INTERRUPT_WATCHDOG] = 12,
  92         [BOOKE_INTERRUPT_EXTERNAL] = 13,
  93         [BOOKE_INTERRUPT_FIT] = 14,
  94         [BOOKE_INTERRUPT_DECREMENTER] = 15,
  95 };
  96
  97 const unsigned char priority_exception[] = {
  98         BOOKE_INTERRUPT_DATA_STORAGE,
  99         BOOKE_INTERRUPT_INST_STORAGE,
 100         BOOKE_INTERRUPT_ALIGNMENT,
 101         BOOKE_INTERRUPT_PROGRAM,
 102         BOOKE_INTERRUPT_FP_UNAVAIL,
 103         BOOKE_INTERRUPT_SYSCALL,
 104         BOOKE_INTERRUPT_AP_UNAVAIL,
 105         BOOKE_INTERRUPT_DTLB_MISS,
 106         BOOKE_INTERRUPT_ITLB_MISS,
 107         BOOKE_INTERRUPT_MACHINE_CHECK,
 108         BOOKE_INTERRUPT_DEBUG,
 109         BOOKE_INTERRUPT_CRITICAL,
 110         BOOKE_INTERRUPT_WATCHDOG,
 111         BOOKE_INTERRUPT_EXTERNAL,
 112         BOOKE_INTERRUPT_FIT,
 113         BOOKE_INTERRUPT_DECREMENTER,
 114 };
 115
 116
 117 /* TODO: use vcpu_printf() */
 118 void kvmppc_dump_vcpu(struct kvm_vcpu *vcpu)
 119 {
 120         int i;
 121
 122         printk("pc:   %08x msr:  %08x\n", vcpu->arch.pc, vcpu->arch.msr);
 123         printk("lr:   %08x ctr:  %08x\n", vcpu->arch.lr, vcpu->arch.ctr);
 124         printk("srr0: %08x srr1: %08x\n", vcpu->arch.srr0, vcpu->arch.srr1);
 125
 126         printk("exceptions: %08lx\n", vcpu->arch.pending_exceptions);
 127
 128         for (i = 0; i < 32; i += 4) {
 129                 printk("gpr%02d: %08x %08x %08x %08x\n", i,
 130                        vcpu->arch.gpr[i],
 131                        vcpu->arch.gpr[i+1],
 132                        vcpu->arch.gpr[i+2],
 133                        vcpu->arch.gpr[i+3]);
 134         }
 135 }
 136
 137 /* Check if we are ready to deliver the interrupt */
 138 static int kvmppc_can_deliver_interrupt(struct kvm_vcpu *vcpu, int interrupt)
 139 {
 140         int r;
 141
 142         switch (interrupt) {
 143         case BOOKE_INTERRUPT_CRITICAL:
 144                 r = vcpu->arch.msr & MSR_CE;
 145                 break;
 146         case BOOKE_INTERRUPT_MACHINE_CHECK:
 147                 r = vcpu->arch.msr & MSR_ME;
 148                 break;
 149         case BOOKE_INTERRUPT_EXTERNAL:
 150                 r = vcpu->arch.msr & MSR_EE;
 151                 break;
 152         case BOOKE_INTERRUPT_DECREMENTER:
 153                 r = vcpu->arch.msr & MSR_EE;
 154                 break;
 155         case BOOKE_INTERRUPT_FIT:
 156                 r = vcpu->arch.msr & MSR_EE;
 157                 break;
 158         case BOOKE_INTERRUPT_WATCHDOG:
 159                 r = vcpu->arch.msr & MSR_CE;
 160                 break;
 161         case BOOKE_INTERRUPT_DEBUG:
 162                 r = vcpu->arch.msr & MSR_DE;
 163                 break;
 164         default:
 165                 r = 1;
 166         }
 167
 168         return r;
 169 }
 170
 171 static void kvmppc_deliver_interrupt(struct kvm_vcpu *vcpu, int interrupt)
 172 {
 173         switch (interrupt) {
 174         case BOOKE_INTERRUPT_DECREMENTER:
 175                 vcpu->arch.tsr |= TSR_DIS;
 176                 break;
 177         }
 178
 179         vcpu->arch.srr0 = vcpu->arch.pc;
 180         vcpu->arch.srr1 = vcpu->arch.msr;
 181         vcpu->arch.pc = vcpu->arch.ivpr | vcpu->arch.ivor[interrupt];
 182         kvmppc_set_msr(vcpu, vcpu->arch.msr & interrupt_msr_mask[interrupt]);
 183 }
 184
 185 /* Check pending exceptions and deliver one, if possible. */
 186 void kvmppc_check_and_deliver_interrupts(struct kvm_vcpu *vcpu)
 187 {
 188         unsigned long *pending = &vcpu->arch.pending_exceptions;
 189         unsigned int exception;
 190         unsigned int priority;
 191
 192         priority = find_first_bit(pending, BITS_PER_BYTE * sizeof(*pending));
 193         while (priority <= BOOKE_MAX_INTERRUPT) {
 194                 exception = priority_exception[priority];
 195                 if (kvmppc_can_deliver_interrupt(vcpu, exception)) {
 196                         kvmppc_clear_exception(vcpu, exception);
 197                         kvmppc_deliver_interrupt(vcpu, exception);
 198                         break;
 199                 }
 200
 201                 priority = find_next_bit(pending,
 202                                          BITS_PER_BYTE * sizeof(*pending),
 203                                          priority + 1);
 204         }
 205 }
 206
 207 /**
 208  * kvmppc_handle_exit
 209  *
 210  * Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV)
 211  */
 212 int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
 213                        unsigned int exit_nr)
 214 {
 215         enum emulation_result er;
 216         int r = RESUME_HOST;
 217
 218         local_irq_enable();
 219
 220         run->exit_reason = KVM_EXIT_UNKNOWN;
 221         run->ready_for_interrupt_injection = 1;
 222
 223         switch (exit_nr) {
 224         case BOOKE_INTERRUPT_MACHINE_CHECK:
 225                 printk("MACHINE CHECK: %lx\n", mfspr(SPRN_MCSR));
 226                 kvmppc_dump_vcpu(vcpu);
 227                 r = RESUME_HOST;
 228                 break;
 229
 230         case BOOKE_INTERRUPT_EXTERNAL:
 231         case BOOKE_INTERRUPT_DECREMENTER:
 232                 /* Since we switched IVPR back to the host's value, the host
 233                  * handled this interrupt the moment we enabled interrupts.
 234                  * Now we just offer it a chance to reschedule the guest. */
 235
 236                 /* XXX At this point the TLB still holds our shadow TLB, so if
 237                  * we do reschedule the host will fault over it. Perhaps we
 238                  * should politely restore the host's entries to minimize
 239                  * misses before ceding control. */
 240                 if (need_resched())
 241                         cond_resched();
 242                 if (exit_nr == BOOKE_INTERRUPT_DECREMENTER)
 243                         vcpu->stat.dec_exits++;
 244                 else
 245                         vcpu->stat.ext_intr_exits++;
 246                 r = RESUME_GUEST;
 247                 break;
 248
 249         case BOOKE_INTERRUPT_PROGRAM:
 250                 if (vcpu->arch.msr & MSR_PR) {
 251                         /* Program traps generated by user-level software must be handled
 252                          * by the guest kernel. */
 253                         vcpu->arch.esr = vcpu->arch.fault_esr;
 254                         kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_PROGRAM);
 255                         r = RESUME_GUEST;
 256                         break;
 257                 }
 258
 259                 er = kvmppc_emulate_instruction(run, vcpu);
 260                 switch (er) {
 261                 case EMULATE_DONE:
 262                         /* Future optimization: only reload non-volatiles if
 263                          * they were actually modified by emulation. */
 264                         vcpu->stat.emulated_inst_exits++;
 265                         r = RESUME_GUEST_NV;
 266                         break;
 267                 case EMULATE_DO_DCR:
 268                         run->exit_reason = KVM_EXIT_DCR;
 269                         r = RESUME_HOST;
 270                         break;
 271                 case EMULATE_FAIL:
 272                         /* XXX Deliver Program interrupt to guest. */
 273                         printk(KERN_CRIT "%s: emulation at %x failed (%08x)\n",
 274                                __func__, vcpu->arch.pc, vcpu->arch.last_inst);
 275                         /* For debugging, encode the failing instruction and
 276                          * report it to userspace. */
 277                         run->hw.hardware_exit_reason = ~0ULL << 32;
 278                         run->hw.hardware_exit_reason |= vcpu->arch.last_inst;
 279                         r = RESUME_HOST;
 280                         break;
 281                 default:
 282                         BUG();
 283                 }
 284                 break;
 285
 286         case BOOKE_INTERRUPT_FP_UNAVAIL:
 287                 kvmppc_queue_exception(vcpu, exit_nr);
 288                 r = RESUME_GUEST;
 289                 break;
 290
 291         case BOOKE_INTERRUPT_DATA_STORAGE:
 292                 vcpu->arch.dear = vcpu->arch.fault_dear;
 293                 vcpu->arch.esr = vcpu->arch.fault_esr;
 294                 kvmppc_queue_exception(vcpu, exit_nr);
 295                 vcpu->stat.dsi_exits++;
 296                 r = RESUME_GUEST;
 297                 break;
 298
 299         case BOOKE_INTERRUPT_INST_STORAGE:
 300                 vcpu->arch.esr = vcpu->arch.fault_esr;
 301                 kvmppc_queue_exception(vcpu, exit_nr);
 302                 vcpu->stat.isi_exits++;
 303                 r = RESUME_GUEST;
 304                 break;
 305
 306         case BOOKE_INTERRUPT_SYSCALL:
 307                 kvmppc_queue_exception(vcpu, exit_nr);
 308                 vcpu->stat.syscall_exits++;
 309                 r = RESUME_GUEST;
 310                 break;
 311
 312         case BOOKE_INTERRUPT_DTLB_MISS: {
 313                 struct kvmppc_44x_tlbe *gtlbe;
 314                 unsigned long eaddr = vcpu->arch.fault_dear;
 315                 gfn_t gfn;
 316
 317                 /* Check the guest TLB. */
 318                 gtlbe = kvmppc_44x_dtlb_search(vcpu, eaddr);
 319                 if (!gtlbe) {
 320                         /* The guest didn't have a mapping for it. */
 321                         kvmppc_queue_exception(vcpu, exit_nr);
 322                         vcpu->arch.dear = vcpu->arch.fault_dear;
 323                         vcpu->arch.esr = vcpu->arch.fault_esr;
 324                         vcpu->stat.dtlb_real_miss_exits++;
 325                         r = RESUME_GUEST;
 326                         break;
 327                 }
 328
 329                 vcpu->arch.paddr_accessed = tlb_xlate(gtlbe, eaddr);
 330                 gfn = vcpu->arch.paddr_accessed >> PAGE_SHIFT;
 331
 332                 if (kvm_is_visible_gfn(vcpu->kvm, gfn)) {
 333                         /* The guest TLB had a mapping, but the shadow TLB
 334                          * didn't, and it is RAM. This could be because:
 335                          * a) the entry is mapping the host kernel, or
 336                          * b) the guest used a large mapping which we're faking
 337                          * Either way, we need to satisfy the fault without
 338                          * invoking the guest. */
 339                         kvmppc_mmu_map(vcpu, eaddr, gfn, gtlbe->tid,
 340                                        gtlbe->word2);
 341                         vcpu->stat.dtlb_virt_miss_exits++;
 342                         r = RESUME_GUEST;
 343                 } else {
 344                         /* Guest has mapped and accessed a page which is not
 345                          * actually RAM. */
 346                         r = kvmppc_emulate_mmio(run, vcpu);
 347                 }
 348
 349                 break;
 350         }
 351
 352         case BOOKE_INTERRUPT_ITLB_MISS: {
 353                 struct kvmppc_44x_tlbe *gtlbe;
 354                 unsigned long eaddr = vcpu->arch.pc;
 355                 gfn_t gfn;
 356
 357                 r = RESUME_GUEST;
 358
 359                 /* Check the guest TLB. */
 360                 gtlbe = kvmppc_44x_itlb_search(vcpu, eaddr);
 361                 if (!gtlbe) {
 362                         /* The guest didn't have a mapping for it. */
 363                         kvmppc_queue_exception(vcpu, exit_nr);
 364                         vcpu->stat.itlb_real_miss_exits++;
 365                         break;
 366                 }
 367
 368                 vcpu->stat.itlb_virt_miss_exits++;
 369
 370                 gfn = tlb_xlate(gtlbe, eaddr) >> PAGE_SHIFT;
 371
 372                 if (kvm_is_visible_gfn(vcpu->kvm, gfn)) {
 373                         /* The guest TLB had a mapping, but the shadow TLB
 374                          * didn't. This could be because:
 375                          * a) the entry is mapping the host kernel, or
 376                          * b) the guest used a large mapping which we're faking
 377                          * Either way, we need to satisfy the fault without
 378                          * invoking the guest. */
 379                         kvmppc_mmu_map(vcpu, eaddr, gfn, gtlbe->tid,
 380                                        gtlbe->word2);
 381                 } else {
 382                         /* Guest mapped and leaped at non-RAM! */
 383                         kvmppc_queue_exception(vcpu,
 384                                                BOOKE_INTERRUPT_MACHINE_CHECK);
 385                 }
 386
 387                 break;
 388         }
 389
 390         case BOOKE_INTERRUPT_DEBUG: {
 391                 u32 dbsr;
 392
 393                 vcpu->arch.pc = mfspr(SPRN_CSRR0);
 394
 395                 /* clear IAC events in DBSR register */
 396                 dbsr = mfspr(SPRN_DBSR);
 397                 dbsr &= DBSR_IAC1 | DBSR_IAC2 | DBSR_IAC3 | DBSR_IAC4;
 398                 mtspr(SPRN_DBSR, dbsr);
 399
 400                 run->exit_reason = KVM_EXIT_DEBUG;
 401                 r = RESUME_HOST;
 402                 break;
 403         }
 404
 405         default:
 406                 printk(KERN_EMERG "exit_nr %d\n", exit_nr);
 407                 BUG();
 408         }
 409
 410         local_irq_disable();
 411
 412         kvmppc_check_and_deliver_interrupts(vcpu);
 413
 414         /* Do some exit accounting. */
 415         vcpu->stat.sum_exits++;
 416         if (!(r & RESUME_HOST)) {
 417                 /* To avoid clobbering exit_reason, only check for signals if
 418                  * we aren't already exiting to userspace for some other
 419                  * reason. */
 420                 if (signal_pending(current)) {
 421                         run->exit_reason = KVM_EXIT_INTR;
 422                         r = (-EINTR << 2) | RESUME_HOST | (r & RESUME_FLAG_NV);
 423
 424                         vcpu->stat.signal_exits++;
 425                 } else {
 426                         vcpu->stat.light_exits++;
 427                 }
 428         } else {
 429                 switch (run->exit_reason) {
 430                 case KVM_EXIT_MMIO:
 431                         vcpu->stat.mmio_exits++;
 432                         break;
 433                 case KVM_EXIT_DCR:
 434                         vcpu->stat.dcr_exits++;
 435                         break;
 436                 case KVM_EXIT_INTR:
 437                         vcpu->stat.signal_exits++;
 438                         break;
 439                 }
 440         }
 441
 442         return r;
 443 }
 444
 445 /* Initial guest state: 16MB mapping 0 -> 0, PC = 0, MSR = 0, R1 = 16MB */
 446 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
 447 {
 448         struct kvmppc_44x_tlbe *tlbe = &vcpu->arch.guest_tlb[0];
 449
 450         tlbe->tid = 0;
 451         tlbe->word0 = PPC44x_TLB_16M | PPC44x_TLB_VALID;
 452         tlbe->word1 = 0;
 453         tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR;
 454
 455         tlbe++;
 456         tlbe->tid = 0;
 457         tlbe->word0 = 0xef600000 | PPC44x_TLB_4K | PPC44x_TLB_VALID;
 458         tlbe->word1 = 0xef600000;
 459         tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR
 460                       | PPC44x_TLB_I | PPC44x_TLB_G;
 461
 462         vcpu->arch.pc = 0;
 463         vcpu->arch.msr = 0;
 464         vcpu->arch.gpr[1] = (16<<20) - 8; /* -8 for the callee-save LR slot */
 465
 466         vcpu->arch.shadow_pid = 1;
 467
 468         /* Eye-catching number so we know if the guest takes an interrupt
 469          * before it's programmed its own IVPR. */
 470         vcpu->arch.ivpr = 0x55550000;
 471
 472         /* Since the guest can directly access the timebase, it must know the
 473          * real timebase frequency. Accordingly, it must see the state of
 474          * CCR1[TCS]. */
 475         vcpu->arch.ccr1 = mfspr(SPRN_CCR1);
 476
 477         return 0;
 478 }
 479
 480 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 481 {
 482         int i;
 483
 484         regs->pc = vcpu->arch.pc;
 485         regs->cr = vcpu->arch.cr;
 486         regs->ctr = vcpu->arch.ctr;
 487         regs->lr = vcpu->arch.lr;
 488         regs->xer = vcpu->arch.xer;
 489         regs->msr = vcpu->arch.msr;
 490         regs->srr0 = vcpu->arch.srr0;
 491         regs->srr1 = vcpu->arch.srr1;
 492         regs->pid = vcpu->arch.pid;
 493         regs->sprg0 = vcpu->arch.sprg0;
 494         regs->sprg1 = vcpu->arch.sprg1;
 495         regs->sprg2 = vcpu->arch.sprg2;
 496         regs->sprg3 = vcpu->arch.sprg3;
 497         regs->sprg5 = vcpu->arch.sprg4;
 498         regs->sprg6 = vcpu->arch.sprg5;
 499         regs->sprg7 = vcpu->arch.sprg6;
 500
 501         for (i = 0; i < ARRAY_SIZE(regs->gpr); i++)
 502                 regs->gpr[i] = vcpu->arch.gpr[i];
 503
 504         return 0;
 505 }
 506
 507 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 508 {
 509         int i;
 510
 511         vcpu->arch.pc = regs->pc;
 512         vcpu->arch.cr = regs->cr;
 513         vcpu->arch.ctr = regs->ctr;
 514         vcpu->arch.lr = regs->lr;
 515         vcpu->arch.xer = regs->xer;
 516         vcpu->arch.msr = regs->msr;
 517         vcpu->arch.srr0 = regs->srr0;
 518         vcpu->arch.srr1 = regs->srr1;
 519         vcpu->arch.sprg0 = regs->sprg0;
 520         vcpu->arch.sprg1 = regs->sprg1;
 521         vcpu->arch.sprg2 = regs->sprg2;
 522         vcpu->arch.sprg3 = regs->sprg3;
 523         vcpu->arch.sprg5 = regs->sprg4;
 524         vcpu->arch.sprg6 = regs->sprg5;
 525         vcpu->arch.sprg7 = regs->sprg6;
 526
 527         for (i = 0; i < ARRAY_SIZE(vcpu->arch.gpr); i++)
 528                 vcpu->arch.gpr[i] = regs->gpr[i];
 529
 530         return 0;
 531 }
 532
 533 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 534                                   struct kvm_sregs *sregs)
 535 {
 536         return -ENOTSUPP;
 537 }
 538
 539 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 540                                   struct kvm_sregs *sregs)
 541 {
 542         return -ENOTSUPP;
 543 }
 544
 545 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 546 {
 547         return -ENOTSUPP;
 548 }
 549
 550 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 551 {
 552         return -ENOTSUPP;
 553 }
 554
 555 /* 'linear_address' is actually an encoding of AS|PID|EADDR . */
 556 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 557                                   struct kvm_translation *tr)
 558 {
 559         struct kvmppc_44x_tlbe *gtlbe;
 560         int index;
 561         gva_t eaddr;
 562         u8 pid;
 563         u8 as;
 564
 565         eaddr = tr->linear_address;
 566         pid = (tr->linear_address >> 32) & 0xff;
 567         as = (tr->linear_address >> 40) & 0x1;
 568
 569         index = kvmppc_44x_tlb_index(vcpu, eaddr, pid, as);
 570         if (index == -1) {
 571                 tr->valid = 0;
 572                 return 0;
 573         }
 574
 575         gtlbe = &vcpu->arch.guest_tlb[index];
 576
 577         tr->physical_address = tlb_xlate(gtlbe, eaddr);
 578         /* XXX what does "writeable" and "usermode" even mean? */
 579         tr->valid = 1;
 580
 581         return 0;
 582 }
 583
 584 static int kvmppc_booke_init(void)
 585 {
 586         unsigned long ivor[16];
 587         unsigned long max_ivor = 0;
 588         int i;
 589
 590         /* We install our own exception handlers by hijacking IVPR. IVPR must
 591          * be 16-bit aligned, so we need a 64KB allocation. */
 592         kvmppc_booke_handlers = __get_free_pages(GFP_KERNEL | __GFP_ZERO,
 593                                                  VCPU_SIZE_ORDER);
 594         if (!kvmppc_booke_handlers)
 595                 return -ENOMEM;
 596
 597         /* XXX make sure our handlers are smaller than Linux's */
 598
 599         /* Copy our interrupt handlers to match host IVORs. That way we don't
 600          * have to swap the IVORs on every guest/host transition. */
 601         ivor[0] = mfspr(SPRN_IVOR0);
 602         ivor[1] = mfspr(SPRN_IVOR1);
 603         ivor[2] = mfspr(SPRN_IVOR2);
 604         ivor[3] = mfspr(SPRN_IVOR3);
 605         ivor[4] = mfspr(SPRN_IVOR4);
 606         ivor[5] = mfspr(SPRN_IVOR5);
 607         ivor[6] = mfspr(SPRN_IVOR6);
 608         ivor[7] = mfspr(SPRN_IVOR7);
 609         ivor[8] = mfspr(SPRN_IVOR8);
 610         ivor[9] = mfspr(SPRN_IVOR9);
 611         ivor[10] = mfspr(SPRN_IVOR10);
 612         ivor[11] = mfspr(SPRN_IVOR11);
 613         ivor[12] = mfspr(SPRN_IVOR12);
 614         ivor[13] = mfspr(SPRN_IVOR13);
 615         ivor[14] = mfspr(SPRN_IVOR14);
 616         ivor[15] = mfspr(SPRN_IVOR15);
 617
 618         for (i = 0; i < 16; i++) {
 619                 if (ivor[i] > max_ivor)
 620                         max_ivor = ivor[i];
 621
 622                 memcpy((void *)kvmppc_booke_handlers + ivor[i],
 623                        kvmppc_handlers_start + i * kvmppc_handler_len,
 624                        kvmppc_handler_len);
 625         }
 626         flush_icache_range(kvmppc_booke_handlers,
 627                            kvmppc_booke_handlers + max_ivor + kvmppc_handler_len);
 628
 629         return kvm_init(NULL, sizeof(struct kvm_vcpu), THIS_MODULE);
 630 }
 631
 632 static void __exit kvmppc_booke_exit(void)
 633 {
 634         free_pages(kvmppc_booke_handlers, VCPU_SIZE_ORDER);
 635         kvm_exit();
 636 }
 637
 638 module_init(kvmppc_booke_init)
 639 module_exit(kvmppc_booke_exit)