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
  28 #include <asm/cputable.h>
  29 #include <asm/uaccess.h>
  30 #include <asm/kvm_ppc.h>
  31 #include "timing.h"
  32 #include <asm/cacheflush.h>
  33
  34 #include "booke.h"
  35
  36 unsigned long kvmppc_booke_handlers;
  37
  38 #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
  39 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
  40
  41 struct kvm_stats_debugfs_item debugfs_entries[] = {
  42         { "mmio",       VCPU_STAT(mmio_exits) },
  43         { "dcr",        VCPU_STAT(dcr_exits) },
  44         { "sig",        VCPU_STAT(signal_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 /* TODO: use vcpu_printf() */
  60 void kvmppc_dump_vcpu(struct kvm_vcpu *vcpu)
  61 {
  62         int i;
  63
  64         printk("pc:   %08lx msr:  %08lx\n", vcpu->arch.pc, vcpu->arch.msr);
  65         printk("lr:   %08lx ctr:  %08lx\n", vcpu->arch.lr, vcpu->arch.ctr);
  66         printk("srr0: %08lx srr1: %08lx\n", vcpu->arch.srr0, vcpu->arch.srr1);
  67
  68         printk("exceptions: %08lx\n", vcpu->arch.pending_exceptions);
  69
  70         for (i = 0; i < 32; i += 4) {
  71                 printk("gpr%02d: %08lx %08lx %08lx %08lx\n", i,
  72                        vcpu->arch.gpr[i],
  73                        vcpu->arch.gpr[i+1],
  74                        vcpu->arch.gpr[i+2],
  75                        vcpu->arch.gpr[i+3]);
  76         }
  77 }
  78
  79 static void kvmppc_booke_queue_irqprio(struct kvm_vcpu *vcpu,
  80                                        unsigned int priority)
  81 {
  82         set_bit(priority, &vcpu->arch.pending_exceptions);
  83 }
  84
  85 void kvmppc_core_queue_program(struct kvm_vcpu *vcpu)
  86 {
  87         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_PROGRAM);
  88 }
  89
  90 void kvmppc_core_queue_dec(struct kvm_vcpu *vcpu)
  91 {
  92         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DECREMENTER);
  93 }
  94
  95 int kvmppc_core_pending_dec(struct kvm_vcpu *vcpu)
  96 {
  97         return test_bit(BOOKE_IRQPRIO_DECREMENTER, &vcpu->arch.pending_exceptions);
  98 }
  99
 100 void kvmppc_core_queue_external(struct kvm_vcpu *vcpu,
 101                                 struct kvm_interrupt *irq)
 102 {
 103         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_EXTERNAL);
 104 }
 105
 106 /* Deliver the interrupt of the corresponding priority, if possible. */
 107 static int kvmppc_booke_irqprio_deliver(struct kvm_vcpu *vcpu,
 108                                         unsigned int priority)
 109 {
 110         int allowed = 0;
 111         ulong msr_mask;
 112
 113         switch (priority) {
 114         case BOOKE_IRQPRIO_PROGRAM:
 115         case BOOKE_IRQPRIO_DTLB_MISS:
 116         case BOOKE_IRQPRIO_ITLB_MISS:
 117         case BOOKE_IRQPRIO_SYSCALL:
 118         case BOOKE_IRQPRIO_DATA_STORAGE:
 119         case BOOKE_IRQPRIO_INST_STORAGE:
 120         case BOOKE_IRQPRIO_FP_UNAVAIL:
 121         case BOOKE_IRQPRIO_SPE_UNAVAIL:
 122         case BOOKE_IRQPRIO_SPE_FP_DATA:
 123         case BOOKE_IRQPRIO_SPE_FP_ROUND:
 124         case BOOKE_IRQPRIO_AP_UNAVAIL:
 125         case BOOKE_IRQPRIO_ALIGNMENT:
 126                 allowed = 1;
 127                 msr_mask = MSR_CE|MSR_ME|MSR_DE;
 128                 break;
 129         case BOOKE_IRQPRIO_CRITICAL:
 130         case BOOKE_IRQPRIO_WATCHDOG:
 131                 allowed = vcpu->arch.msr & MSR_CE;
 132                 msr_mask = MSR_ME;
 133                 break;
 134         case BOOKE_IRQPRIO_MACHINE_CHECK:
 135                 allowed = vcpu->arch.msr & MSR_ME;
 136                 msr_mask = 0;
 137                 break;
 138         case BOOKE_IRQPRIO_EXTERNAL:
 139         case BOOKE_IRQPRIO_DECREMENTER:
 140         case BOOKE_IRQPRIO_FIT:
 141                 allowed = vcpu->arch.msr & MSR_EE;
 142                 msr_mask = MSR_CE|MSR_ME|MSR_DE;
 143                 break;
 144         case BOOKE_IRQPRIO_DEBUG:
 145                 allowed = vcpu->arch.msr & MSR_DE;
 146                 msr_mask = MSR_ME;
 147                 break;
 148         }
 149
 150         if (allowed) {
 151                 vcpu->arch.srr0 = vcpu->arch.pc;
 152                 vcpu->arch.srr1 = vcpu->arch.msr;
 153                 vcpu->arch.pc = vcpu->arch.ivpr | vcpu->arch.ivor[priority];
 154                 kvmppc_set_msr(vcpu, vcpu->arch.msr & msr_mask);
 155
 156                 clear_bit(priority, &vcpu->arch.pending_exceptions);
 157         }
 158
 159         return allowed;
 160 }
 161
 162 /* Check pending exceptions and deliver one, if possible. */
 163 void kvmppc_core_deliver_interrupts(struct kvm_vcpu *vcpu)
 164 {
 165         unsigned long *pending = &vcpu->arch.pending_exceptions;
 166         unsigned int priority;
 167
 168         priority = __ffs(*pending);
 169         while (priority <= BOOKE_IRQPRIO_MAX) {
 170                 if (kvmppc_booke_irqprio_deliver(vcpu, priority))
 171                         break;
 172
 173                 priority = find_next_bit(pending,
 174                                          BITS_PER_BYTE * sizeof(*pending),
 175                                          priority + 1);
 176         }
 177 }
 178
 179 /**
 180  * kvmppc_handle_exit
 181  *
 182  * Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV)
 183  */
 184 int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
 185                        unsigned int exit_nr)
 186 {
 187         enum emulation_result er;
 188         int r = RESUME_HOST;
 189
 190         /* update before a new last_exit_type is rewritten */
 191         kvmppc_update_timing_stats(vcpu);
 192
 193         local_irq_enable();
 194
 195         run->exit_reason = KVM_EXIT_UNKNOWN;
 196         run->ready_for_interrupt_injection = 1;
 197
 198         switch (exit_nr) {
 199         case BOOKE_INTERRUPT_MACHINE_CHECK:
 200                 printk("MACHINE CHECK: %lx\n", mfspr(SPRN_MCSR));
 201                 kvmppc_dump_vcpu(vcpu);
 202                 r = RESUME_HOST;
 203                 break;
 204
 205         case BOOKE_INTERRUPT_EXTERNAL:
 206                 kvmppc_account_exit(vcpu, EXT_INTR_EXITS);
 207                 if (need_resched())
 208                         cond_resched();
 209                 r = RESUME_GUEST;
 210                 break;
 211
 212         case BOOKE_INTERRUPT_DECREMENTER:
 213                 /* Since we switched IVPR back to the host's value, the host
 214                  * handled this interrupt the moment we enabled interrupts.
 215                  * Now we just offer it a chance to reschedule the guest. */
 216                 kvmppc_account_exit(vcpu, DEC_EXITS);
 217                 if (need_resched())
 218                         cond_resched();
 219                 r = RESUME_GUEST;
 220                 break;
 221
 222         case BOOKE_INTERRUPT_PROGRAM:
 223                 if (vcpu->arch.msr & MSR_PR) {
 224                         /* Program traps generated by user-level software must be handled
 225                          * by the guest kernel. */
 226                         vcpu->arch.esr = vcpu->arch.fault_esr;
 227                         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_PROGRAM);
 228                         r = RESUME_GUEST;
 229                         kvmppc_account_exit(vcpu, USR_PR_INST);
 230                         break;
 231                 }
 232
 233                 er = kvmppc_emulate_instruction(run, vcpu);
 234                 switch (er) {
 235                 case EMULATE_DONE:
 236                         /* don't overwrite subtypes, just account kvm_stats */
 237                         kvmppc_account_exit_stat(vcpu, EMULATED_INST_EXITS);
 238                         /* Future optimization: only reload non-volatiles if
 239                          * they were actually modified by emulation. */
 240                         r = RESUME_GUEST_NV;
 241                         break;
 242                 case EMULATE_DO_DCR:
 243                         run->exit_reason = KVM_EXIT_DCR;
 244                         r = RESUME_HOST;
 245                         break;
 246                 case EMULATE_FAIL:
 247                         /* XXX Deliver Program interrupt to guest. */
 248                         printk(KERN_CRIT "%s: emulation at %lx failed (%08x)\n",
 249                                __func__, vcpu->arch.pc, vcpu->arch.last_inst);
 250                         /* For debugging, encode the failing instruction and
 251                          * report it to userspace. */
 252                         run->hw.hardware_exit_reason = ~0ULL << 32;
 253                         run->hw.hardware_exit_reason |= vcpu->arch.last_inst;
 254                         r = RESUME_HOST;
 255                         break;
 256                 default:
 257                         BUG();
 258                 }
 259                 break;
 260
 261         case BOOKE_INTERRUPT_FP_UNAVAIL:
 262                 kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_FP_UNAVAIL);
 263                 kvmppc_account_exit(vcpu, FP_UNAVAIL);
 264                 r = RESUME_GUEST;
 265                 break;
 266
 267         case BOOKE_INTERRUPT_SPE_UNAVAIL:
 268                 kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_SPE_UNAVAIL);
 269                 r = RESUME_GUEST;
 270                 break;
 271
 272         case BOOKE_INTERRUPT_SPE_FP_DATA:
 273                 kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_SPE_FP_DATA);
 274                 r = RESUME_GUEST;
 275                 break;
 276
 277         case BOOKE_INTERRUPT_SPE_FP_ROUND:
 278                 kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_SPE_FP_ROUND);
 279                 r = RESUME_GUEST;
 280                 break;
 281
 282         case BOOKE_INTERRUPT_DATA_STORAGE:
 283                 vcpu->arch.dear = vcpu->arch.fault_dear;
 284                 vcpu->arch.esr = vcpu->arch.fault_esr;
 285                 kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DATA_STORAGE);
 286                 kvmppc_account_exit(vcpu, DSI_EXITS);
 287                 r = RESUME_GUEST;
 288                 break;
 289
 290         case BOOKE_INTERRUPT_INST_STORAGE:
 291                 vcpu->arch.esr = vcpu->arch.fault_esr;
 292                 kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_INST_STORAGE);
 293                 kvmppc_account_exit(vcpu, ISI_EXITS);
 294                 r = RESUME_GUEST;
 295                 break;
 296
 297         case BOOKE_INTERRUPT_SYSCALL:
 298                 kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_SYSCALL);
 299                 kvmppc_account_exit(vcpu, SYSCALL_EXITS);
 300                 r = RESUME_GUEST;
 301                 break;
 302
 303         case BOOKE_INTERRUPT_DTLB_MISS: {
 304                 unsigned long eaddr = vcpu->arch.fault_dear;
 305                 int gtlb_index;
 306                 gpa_t gpaddr;
 307                 gfn_t gfn;
 308
 309                 /* Check the guest TLB. */
 310                 gtlb_index = kvmppc_mmu_dtlb_index(vcpu, eaddr);
 311                 if (gtlb_index < 0) {
 312                         /* The guest didn't have a mapping for it. */
 313                         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_DTLB_MISS);
 314                         vcpu->arch.dear = vcpu->arch.fault_dear;
 315                         vcpu->arch.esr = vcpu->arch.fault_esr;
 316                         kvmppc_mmu_dtlb_miss(vcpu);
 317                         kvmppc_account_exit(vcpu, DTLB_REAL_MISS_EXITS);
 318                         r = RESUME_GUEST;
 319                         break;
 320                 }
 321
 322                 gpaddr = kvmppc_mmu_xlate(vcpu, gtlb_index, eaddr);
 323                 gfn = gpaddr >> PAGE_SHIFT;
 324
 325                 if (kvm_is_visible_gfn(vcpu->kvm, gfn)) {
 326                         /* The guest TLB had a mapping, but the shadow TLB
 327                          * didn't, and it is RAM. This could be because:
 328                          * a) the entry is mapping the host kernel, or
 329                          * b) the guest used a large mapping which we're faking
 330                          * Either way, we need to satisfy the fault without
 331                          * invoking the guest. */
 332                         kvmppc_mmu_map(vcpu, eaddr, gpaddr, gtlb_index);
 333                         kvmppc_account_exit(vcpu, DTLB_VIRT_MISS_EXITS);
 334                         r = RESUME_GUEST;
 335                 } else {
 336                         /* Guest has mapped and accessed a page which is not
 337                          * actually RAM. */
 338                         vcpu->arch.paddr_accessed = gpaddr;
 339                         r = kvmppc_emulate_mmio(run, vcpu);
 340                         kvmppc_account_exit(vcpu, MMIO_EXITS);
 341                 }
 342
 343                 break;
 344         }
 345
 346         case BOOKE_INTERRUPT_ITLB_MISS: {
 347                 unsigned long eaddr = vcpu->arch.pc;
 348                 gpa_t gpaddr;
 349                 gfn_t gfn;
 350                 int gtlb_index;
 351
 352                 r = RESUME_GUEST;
 353
 354                 /* Check the guest TLB. */
 355                 gtlb_index = kvmppc_mmu_itlb_index(vcpu, eaddr);
 356                 if (gtlb_index < 0) {
 357                         /* The guest didn't have a mapping for it. */
 358                         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_ITLB_MISS);
 359                         kvmppc_mmu_itlb_miss(vcpu);
 360                         kvmppc_account_exit(vcpu, ITLB_REAL_MISS_EXITS);
 361                         break;
 362                 }
 363
 364                 kvmppc_account_exit(vcpu, ITLB_VIRT_MISS_EXITS);
 365
 366                 gpaddr = kvmppc_mmu_xlate(vcpu, gtlb_index, eaddr);
 367                 gfn = gpaddr >> 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, gpaddr, gtlb_index);
 377                 } else {
 378                         /* Guest mapped and leaped at non-RAM! */
 379                         kvmppc_booke_queue_irqprio(vcpu, BOOKE_IRQPRIO_MACHINE_CHECK);
 380                 }
 381
 382                 break;
 383         }
 384
 385         case BOOKE_INTERRUPT_DEBUG: {
 386                 u32 dbsr;
 387
 388                 vcpu->arch.pc = mfspr(SPRN_CSRR0);
 389
 390                 /* clear IAC events in DBSR register */
 391                 dbsr = mfspr(SPRN_DBSR);
 392                 dbsr &= DBSR_IAC1 | DBSR_IAC2 | DBSR_IAC3 | DBSR_IAC4;
 393                 mtspr(SPRN_DBSR, dbsr);
 394
 395                 run->exit_reason = KVM_EXIT_DEBUG;
 396                 kvmppc_account_exit(vcpu, DEBUG_EXITS);
 397                 r = RESUME_HOST;
 398                 break;
 399         }
 400
 401         default:
 402                 printk(KERN_EMERG "exit_nr %d\n", exit_nr);
 403                 BUG();
 404         }
 405
 406         local_irq_disable();
 407
 408         kvmppc_core_deliver_interrupts(vcpu);
 409
 410         if (!(r & RESUME_HOST)) {
 411                 /* To avoid clobbering exit_reason, only check for signals if
 412                  * we aren't already exiting to userspace for some other
 413                  * reason. */
 414                 if (signal_pending(current)) {
 415                         run->exit_reason = KVM_EXIT_INTR;
 416                         r = (-EINTR << 2) | RESUME_HOST | (r & RESUME_FLAG_NV);
 417                         kvmppc_account_exit(vcpu, SIGNAL_EXITS);
 418                 }
 419         }
 420
 421         return r;
 422 }
 423
 424 /* Initial guest state: 16MB mapping 0 -> 0, PC = 0, MSR = 0, R1 = 16MB */
 425 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
 426 {
 427         vcpu->arch.pc = 0;
 428         vcpu->arch.msr = 0;
 429         vcpu->arch.gpr[1] = (16<<20) - 8; /* -8 for the callee-save LR slot */
 430
 431         vcpu->arch.shadow_pid = 1;
 432
 433         /* Eye-catching number so we know if the guest takes an interrupt
 434          * before it's programmed its own IVPR. */
 435         vcpu->arch.ivpr = 0x55550000;
 436
 437         kvmppc_init_timing_stats(vcpu);
 438
 439         return kvmppc_core_vcpu_setup(vcpu);
 440 }
 441
 442 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 443 {
 444         int i;
 445
 446         regs->pc = vcpu->arch.pc;
 447         regs->cr = vcpu->arch.cr;
 448         regs->ctr = vcpu->arch.ctr;
 449         regs->lr = vcpu->arch.lr;
 450         regs->xer = vcpu->arch.xer;
 451         regs->msr = vcpu->arch.msr;
 452         regs->srr0 = vcpu->arch.srr0;
 453         regs->srr1 = vcpu->arch.srr1;
 454         regs->pid = vcpu->arch.pid;
 455         regs->sprg0 = vcpu->arch.sprg0;
 456         regs->sprg1 = vcpu->arch.sprg1;
 457         regs->sprg2 = vcpu->arch.sprg2;
 458         regs->sprg3 = vcpu->arch.sprg3;
 459         regs->sprg5 = vcpu->arch.sprg4;
 460         regs->sprg6 = vcpu->arch.sprg5;
 461         regs->sprg7 = vcpu->arch.sprg6;
 462
 463         for (i = 0; i < ARRAY_SIZE(regs->gpr); i++)
 464                 regs->gpr[i] = vcpu->arch.gpr[i];
 465
 466         return 0;
 467 }
 468
 469 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 470 {
 471         int i;
 472
 473         vcpu->arch.pc = regs->pc;
 474         vcpu->arch.cr = regs->cr;
 475         vcpu->arch.ctr = regs->ctr;
 476         vcpu->arch.lr = regs->lr;
 477         vcpu->arch.xer = regs->xer;
 478         kvmppc_set_msr(vcpu, regs->msr);
 479         vcpu->arch.srr0 = regs->srr0;
 480         vcpu->arch.srr1 = regs->srr1;
 481         vcpu->arch.sprg0 = regs->sprg0;
 482         vcpu->arch.sprg1 = regs->sprg1;
 483         vcpu->arch.sprg2 = regs->sprg2;
 484         vcpu->arch.sprg3 = regs->sprg3;
 485         vcpu->arch.sprg5 = regs->sprg4;
 486         vcpu->arch.sprg6 = regs->sprg5;
 487         vcpu->arch.sprg7 = regs->sprg6;
 488
 489         for (i = 0; i < ARRAY_SIZE(vcpu->arch.gpr); i++)
 490                 vcpu->arch.gpr[i] = regs->gpr[i];
 491
 492         return 0;
 493 }
 494
 495 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 496                                   struct kvm_sregs *sregs)
 497 {
 498         return -ENOTSUPP;
 499 }
 500
 501 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 502                                   struct kvm_sregs *sregs)
 503 {
 504         return -ENOTSUPP;
 505 }
 506
 507 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 508 {
 509         return -ENOTSUPP;
 510 }
 511
 512 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 513 {
 514         return -ENOTSUPP;
 515 }
 516
 517 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 518                                   struct kvm_translation *tr)
 519 {
 520         return kvmppc_core_vcpu_translate(vcpu, tr);
 521 }
 522
 523 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 524 {
 525         return -ENOTSUPP;
 526 }
 527
 528 int __init kvmppc_booke_init(void)
 529 {
 530         unsigned long ivor[16];
 531         unsigned long max_ivor = 0;
 532         int i;
 533
 534         /* We install our own exception handlers by hijacking IVPR. IVPR must
 535          * be 16-bit aligned, so we need a 64KB allocation. */
 536         kvmppc_booke_handlers = __get_free_pages(GFP_KERNEL | __GFP_ZERO,
 537                                                  VCPU_SIZE_ORDER);
 538         if (!kvmppc_booke_handlers)
 539                 return -ENOMEM;
 540
 541         /* XXX make sure our handlers are smaller than Linux's */
 542
 543         /* Copy our interrupt handlers to match host IVORs. That way we don't
 544          * have to swap the IVORs on every guest/host transition. */
 545         ivor[0] = mfspr(SPRN_IVOR0);
 546         ivor[1] = mfspr(SPRN_IVOR1);
 547         ivor[2] = mfspr(SPRN_IVOR2);
 548         ivor[3] = mfspr(SPRN_IVOR3);
 549         ivor[4] = mfspr(SPRN_IVOR4);
 550         ivor[5] = mfspr(SPRN_IVOR5);
 551         ivor[6] = mfspr(SPRN_IVOR6);
 552         ivor[7] = mfspr(SPRN_IVOR7);
 553         ivor[8] = mfspr(SPRN_IVOR8);
 554         ivor[9] = mfspr(SPRN_IVOR9);
 555         ivor[10] = mfspr(SPRN_IVOR10);
 556         ivor[11] = mfspr(SPRN_IVOR11);
 557         ivor[12] = mfspr(SPRN_IVOR12);
 558         ivor[13] = mfspr(SPRN_IVOR13);
 559         ivor[14] = mfspr(SPRN_IVOR14);
 560         ivor[15] = mfspr(SPRN_IVOR15);
 561
 562         for (i = 0; i < 16; i++) {
 563                 if (ivor[i] > max_ivor)
 564                         max_ivor = ivor[i];
 565
 566                 memcpy((void *)kvmppc_booke_handlers + ivor[i],
 567                        kvmppc_handlers_start + i * kvmppc_handler_len,
 568                        kvmppc_handler_len);
 569         }
 570         flush_icache_range(kvmppc_booke_handlers,
 571                            kvmppc_booke_handlers + max_ivor + kvmppc_handler_len);
 572
 573         return 0;
 574 }
 575
 576 void __exit kvmppc_booke_exit(void)
 577 {
 578         free_pages(kvmppc_booke_handlers, VCPU_SIZE_ORDER);
 579         kvm_exit();
 580 }