git.oblomov.eu Git - linux-2.6/blob - drivers/kvm/kvm_main.c

   1 /*
   2  * Kernel-based Virtual Machine driver for Linux
   3  *
   4  * This module enables machines with Intel VT-x extensions to run virtual
   5  * machines without emulation or binary translation.
   6  *
   7  * Copyright (C) 2006 Qumranet, Inc.
   8  *
   9  * Authors:
  10  *   Avi Kivity   <avi@qumranet.com>
  11  *   Yaniv Kamay  <yaniv@qumranet.com>
  12  *
  13  * This work is licensed under the terms of the GNU GPL, version 2.  See
  14  * the COPYING file in the top-level directory.
  15  *
  16  */
  17
  18 #include "kvm.h"
  19 #include "x86.h"
  20 #include "irq.h"
  21
  22 #include <linux/kvm.h>
  23 #include <linux/module.h>
  24 #include <linux/errno.h>
  25 #include <linux/percpu.h>
  26 #include <linux/gfp.h>
  27 #include <linux/mm.h>
  28 #include <linux/miscdevice.h>
  29 #include <linux/vmalloc.h>
  30 #include <linux/reboot.h>
  31 #include <linux/debugfs.h>
  32 #include <linux/highmem.h>
  33 #include <linux/file.h>
  34 #include <linux/sysdev.h>
  35 #include <linux/cpu.h>
  36 #include <linux/sched.h>
  37 #include <linux/cpumask.h>
  38 #include <linux/smp.h>
  39 #include <linux/anon_inodes.h>
  40 #include <linux/profile.h>
  41 #include <linux/kvm_para.h>
  42 #include <linux/pagemap.h>
  43 #include <linux/mman.h>
  44
  45 #include <asm/processor.h>
  46 #include <asm/io.h>
  47 #include <asm/uaccess.h>
  48 #include <asm/desc.h>
  49 #include <asm/pgtable.h>
  50
  51 MODULE_AUTHOR("Qumranet");
  52 MODULE_LICENSE("GPL");
  53
  54 DEFINE_SPINLOCK(kvm_lock);
  55 LIST_HEAD(vm_list);
  56
  57 static cpumask_t cpus_hardware_enabled;
  58
  59 struct kmem_cache *kvm_vcpu_cache;
  60 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
  61
  62 static __read_mostly struct preempt_ops kvm_preempt_ops;
  63
  64 static struct dentry *debugfs_dir;
  65
  66 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
  67                            unsigned long arg);
  68
  69 static inline int valid_vcpu(int n)
  70 {
  71         return likely(n >= 0 && n < KVM_MAX_VCPUS);
  72 }
  73
  74 /*
  75  * Switches to specified vcpu, until a matching vcpu_put()
  76  */
  77 void vcpu_load(struct kvm_vcpu *vcpu)
  78 {
  79         int cpu;
  80
  81         mutex_lock(&vcpu->mutex);
  82         cpu = get_cpu();
  83         preempt_notifier_register(&vcpu->preempt_notifier);
  84         kvm_arch_vcpu_load(vcpu, cpu);
  85         put_cpu();
  86 }
  87
  88 void vcpu_put(struct kvm_vcpu *vcpu)
  89 {
  90         preempt_disable();
  91         kvm_arch_vcpu_put(vcpu);
  92         preempt_notifier_unregister(&vcpu->preempt_notifier);
  93         preempt_enable();
  94         mutex_unlock(&vcpu->mutex);
  95 }
  96
  97 static void ack_flush(void *_completed)
  98 {
  99 }
 100
 101 void kvm_flush_remote_tlbs(struct kvm *kvm)
 102 {
 103         int i, cpu;
 104         cpumask_t cpus;
 105         struct kvm_vcpu *vcpu;
 106
 107         cpus_clear(cpus);
 108         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 109                 vcpu = kvm->vcpus[i];
 110                 if (!vcpu)
 111                         continue;
 112                 if (test_and_set_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests))
 113                         continue;
 114                 cpu = vcpu->cpu;
 115                 if (cpu != -1 && cpu != raw_smp_processor_id())
 116                         cpu_set(cpu, cpus);
 117         }
 118         if (cpus_empty(cpus))
 119                 return;
 120         ++kvm->stat.remote_tlb_flush;
 121         smp_call_function_mask(cpus, ack_flush, NULL, 1);
 122 }
 123
 124 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
 125 {
 126         struct page *page;
 127         int r;
 128
 129         mutex_init(&vcpu->mutex);
 130         vcpu->cpu = -1;
 131         vcpu->kvm = kvm;
 132         vcpu->vcpu_id = id;
 133         init_waitqueue_head(&vcpu->wq);
 134
 135         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 136         if (!page) {
 137                 r = -ENOMEM;
 138                 goto fail;
 139         }
 140         vcpu->run = page_address(page);
 141
 142         r = kvm_arch_vcpu_init(vcpu);
 143         if (r < 0)
 144                 goto fail_free_run;
 145         return 0;
 146
 147 fail_free_run:
 148         free_page((unsigned long)vcpu->run);
 149 fail:
 150         return r;
 151 }
 152 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
 153
 154 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
 155 {
 156         kvm_arch_vcpu_uninit(vcpu);
 157         free_page((unsigned long)vcpu->run);
 158 }
 159 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
 160
 161 static struct kvm *kvm_create_vm(void)
 162 {
 163         struct kvm *kvm = kvm_arch_create_vm();
 164
 165         if (IS_ERR(kvm))
 166                 goto out;
 167
 168         kvm_io_bus_init(&kvm->pio_bus);
 169         mutex_init(&kvm->lock);
 170         kvm_io_bus_init(&kvm->mmio_bus);
 171         spin_lock(&kvm_lock);
 172         list_add(&kvm->vm_list, &vm_list);
 173         spin_unlock(&kvm_lock);
 174 out:
 175         return kvm;
 176 }
 177
 178 /*
 179  * Free any memory in @free but not in @dont.
 180  */
 181 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
 182                                   struct kvm_memory_slot *dont)
 183 {
 184         if (!dont || free->rmap != dont->rmap)
 185                 vfree(free->rmap);
 186
 187         if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
 188                 vfree(free->dirty_bitmap);
 189
 190         free->npages = 0;
 191         free->dirty_bitmap = NULL;
 192         free->rmap = NULL;
 193 }
 194
 195 void kvm_free_physmem(struct kvm *kvm)
 196 {
 197         int i;
 198
 199         for (i = 0; i < kvm->nmemslots; ++i)
 200                 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
 201 }
 202
 203 static void kvm_destroy_vm(struct kvm *kvm)
 204 {
 205         spin_lock(&kvm_lock);
 206         list_del(&kvm->vm_list);
 207         spin_unlock(&kvm_lock);
 208         kvm_io_bus_destroy(&kvm->pio_bus);
 209         kvm_io_bus_destroy(&kvm->mmio_bus);
 210         kvm_arch_destroy_vm(kvm);
 211 }
 212
 213 static int kvm_vm_release(struct inode *inode, struct file *filp)
 214 {
 215         struct kvm *kvm = filp->private_data;
 216
 217         kvm_destroy_vm(kvm);
 218         return 0;
 219 }
 220
 221 /*
 222  * Allocate some memory and give it an address in the guest physical address
 223  * space.
 224  *
 225  * Discontiguous memory is allowed, mostly for framebuffers.
 226  *
 227  * Must be called holding kvm->lock.
 228  */
 229 int __kvm_set_memory_region(struct kvm *kvm,
 230                             struct kvm_userspace_memory_region *mem,
 231                             int user_alloc)
 232 {
 233         int r;
 234         gfn_t base_gfn;
 235         unsigned long npages;
 236         unsigned long i;
 237         struct kvm_memory_slot *memslot;
 238         struct kvm_memory_slot old, new;
 239
 240         r = -EINVAL;
 241         /* General sanity checks */
 242         if (mem->memory_size & (PAGE_SIZE - 1))
 243                 goto out;
 244         if (mem->guest_phys_addr & (PAGE_SIZE - 1))
 245                 goto out;
 246         if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
 247                 goto out;
 248         if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
 249                 goto out;
 250
 251         memslot = &kvm->memslots[mem->slot];
 252         base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
 253         npages = mem->memory_size >> PAGE_SHIFT;
 254
 255         if (!npages)
 256                 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
 257
 258         new = old = *memslot;
 259
 260         new.base_gfn = base_gfn;
 261         new.npages = npages;
 262         new.flags = mem->flags;
 263
 264         /* Disallow changing a memory slot's size. */
 265         r = -EINVAL;
 266         if (npages && old.npages && npages != old.npages)
 267                 goto out_free;
 268
 269         /* Check for overlaps */
 270         r = -EEXIST;
 271         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
 272                 struct kvm_memory_slot *s = &kvm->memslots[i];
 273
 274                 if (s == memslot)
 275                         continue;
 276                 if (!((base_gfn + npages <= s->base_gfn) ||
 277                       (base_gfn >= s->base_gfn + s->npages)))
 278                         goto out_free;
 279         }
 280
 281         /* Free page dirty bitmap if unneeded */
 282         if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
 283                 new.dirty_bitmap = NULL;
 284
 285         r = -ENOMEM;
 286
 287         /* Allocate if a slot is being created */
 288         if (npages && !new.rmap) {
 289                 new.rmap = vmalloc(npages * sizeof(struct page *));
 290
 291                 if (!new.rmap)
 292                         goto out_free;
 293
 294                 memset(new.rmap, 0, npages * sizeof(*new.rmap));
 295
 296                 new.user_alloc = user_alloc;
 297                 new.userspace_addr = mem->userspace_addr;
 298         }
 299
 300         /* Allocate page dirty bitmap if needed */
 301         if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
 302                 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
 303
 304                 new.dirty_bitmap = vmalloc(dirty_bytes);
 305                 if (!new.dirty_bitmap)
 306                         goto out_free;
 307                 memset(new.dirty_bitmap, 0, dirty_bytes);
 308         }
 309
 310         if (mem->slot >= kvm->nmemslots)
 311                 kvm->nmemslots = mem->slot + 1;
 312
 313         *memslot = new;
 314
 315         r = kvm_arch_set_memory_region(kvm, mem, old, user_alloc);
 316         if (r) {
 317                 *memslot = old;
 318                 goto out_free;
 319         }
 320
 321         kvm_free_physmem_slot(&old, &new);
 322         return 0;
 323
 324 out_free:
 325         kvm_free_physmem_slot(&new, &old);
 326 out:
 327         return r;
 328
 329 }
 330 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
 331
 332 int kvm_set_memory_region(struct kvm *kvm,
 333                           struct kvm_userspace_memory_region *mem,
 334                           int user_alloc)
 335 {
 336         int r;
 337
 338         mutex_lock(&kvm->lock);
 339         r = __kvm_set_memory_region(kvm, mem, user_alloc);
 340         mutex_unlock(&kvm->lock);
 341         return r;
 342 }
 343 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
 344
 345 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
 346                                    struct
 347                                    kvm_userspace_memory_region *mem,
 348                                    int user_alloc)
 349 {
 350         if (mem->slot >= KVM_MEMORY_SLOTS)
 351                 return -EINVAL;
 352         return kvm_set_memory_region(kvm, mem, user_alloc);
 353 }
 354
 355 int kvm_get_dirty_log(struct kvm *kvm,
 356                         struct kvm_dirty_log *log, int *is_dirty)
 357 {
 358         struct kvm_memory_slot *memslot;
 359         int r, i;
 360         int n;
 361         unsigned long any = 0;
 362
 363         r = -EINVAL;
 364         if (log->slot >= KVM_MEMORY_SLOTS)
 365                 goto out;
 366
 367         memslot = &kvm->memslots[log->slot];
 368         r = -ENOENT;
 369         if (!memslot->dirty_bitmap)
 370                 goto out;
 371
 372         n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
 373
 374         for (i = 0; !any && i < n/sizeof(long); ++i)
 375                 any = memslot->dirty_bitmap[i];
 376
 377         r = -EFAULT;
 378         if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
 379                 goto out;
 380
 381         if (any)
 382                 *is_dirty = 1;
 383
 384         r = 0;
 385 out:
 386         return r;
 387 }
 388
 389 int is_error_page(struct page *page)
 390 {
 391         return page == bad_page;
 392 }
 393 EXPORT_SYMBOL_GPL(is_error_page);
 394
 395 static inline unsigned long bad_hva(void)
 396 {
 397         return PAGE_OFFSET;
 398 }
 399
 400 int kvm_is_error_hva(unsigned long addr)
 401 {
 402         return addr == bad_hva();
 403 }
 404 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
 405
 406 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
 407 {
 408         int i;
 409         struct kvm_mem_alias *alias;
 410
 411         for (i = 0; i < kvm->naliases; ++i) {
 412                 alias = &kvm->aliases[i];
 413                 if (gfn >= alias->base_gfn
 414                     && gfn < alias->base_gfn + alias->npages)
 415                         return alias->target_gfn + gfn - alias->base_gfn;
 416         }
 417         return gfn;
 418 }
 419
 420 static struct kvm_memory_slot *__gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
 421 {
 422         int i;
 423
 424         for (i = 0; i < kvm->nmemslots; ++i) {
 425                 struct kvm_memory_slot *memslot = &kvm->memslots[i];
 426
 427                 if (gfn >= memslot->base_gfn
 428                     && gfn < memslot->base_gfn + memslot->npages)
 429                         return memslot;
 430         }
 431         return NULL;
 432 }
 433
 434 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
 435 {
 436         gfn = unalias_gfn(kvm, gfn);
 437         return __gfn_to_memslot(kvm, gfn);
 438 }
 439
 440 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
 441 {
 442         int i;
 443
 444         gfn = unalias_gfn(kvm, gfn);
 445         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
 446                 struct kvm_memory_slot *memslot = &kvm->memslots[i];
 447
 448                 if (gfn >= memslot->base_gfn
 449                     && gfn < memslot->base_gfn + memslot->npages)
 450                         return 1;
 451         }
 452         return 0;
 453 }
 454 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
 455
 456 static unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
 457 {
 458         struct kvm_memory_slot *slot;
 459
 460         gfn = unalias_gfn(kvm, gfn);
 461         slot = __gfn_to_memslot(kvm, gfn);
 462         if (!slot)
 463                 return bad_hva();
 464         return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE);
 465 }
 466
 467 /*
 468  * Requires current->mm->mmap_sem to be held
 469  */
 470 static struct page *__gfn_to_page(struct kvm *kvm, gfn_t gfn)
 471 {
 472         struct page *page[1];
 473         unsigned long addr;
 474         int npages;
 475
 476         might_sleep();
 477
 478         addr = gfn_to_hva(kvm, gfn);
 479         if (kvm_is_error_hva(addr)) {
 480                 get_page(bad_page);
 481                 return bad_page;
 482         }
 483
 484         npages = get_user_pages(current, current->mm, addr, 1, 1, 1, page,
 485                                 NULL);
 486
 487         if (npages != 1) {
 488                 get_page(bad_page);
 489                 return bad_page;
 490         }
 491
 492         return page[0];
 493 }
 494
 495 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
 496 {
 497         struct page *page;
 498
 499         down_read(&current->mm->mmap_sem);
 500         page = __gfn_to_page(kvm, gfn);
 501         up_read(&current->mm->mmap_sem);
 502
 503         return page;
 504 }
 505
 506 EXPORT_SYMBOL_GPL(gfn_to_page);
 507
 508 void kvm_release_page_clean(struct page *page)
 509 {
 510         put_page(page);
 511 }
 512 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
 513
 514 void kvm_release_page_dirty(struct page *page)
 515 {
 516         if (!PageReserved(page))
 517                 SetPageDirty(page);
 518         put_page(page);
 519 }
 520 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
 521
 522 static int next_segment(unsigned long len, int offset)
 523 {
 524         if (len > PAGE_SIZE - offset)
 525                 return PAGE_SIZE - offset;
 526         else
 527                 return len;
 528 }
 529
 530 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
 531                         int len)
 532 {
 533         int r;
 534         unsigned long addr;
 535
 536         addr = gfn_to_hva(kvm, gfn);
 537         if (kvm_is_error_hva(addr))
 538                 return -EFAULT;
 539         r = copy_from_user(data, (void __user *)addr + offset, len);
 540         if (r)
 541                 return -EFAULT;
 542         return 0;
 543 }
 544 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
 545
 546 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
 547 {
 548         gfn_t gfn = gpa >> PAGE_SHIFT;
 549         int seg;
 550         int offset = offset_in_page(gpa);
 551         int ret;
 552
 553         while ((seg = next_segment(len, offset)) != 0) {
 554                 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
 555                 if (ret < 0)
 556                         return ret;
 557                 offset = 0;
 558                 len -= seg;
 559                 data += seg;
 560                 ++gfn;
 561         }
 562         return 0;
 563 }
 564 EXPORT_SYMBOL_GPL(kvm_read_guest);
 565
 566 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
 567                          int offset, int len)
 568 {
 569         int r;
 570         unsigned long addr;
 571
 572         addr = gfn_to_hva(kvm, gfn);
 573         if (kvm_is_error_hva(addr))
 574                 return -EFAULT;
 575         r = copy_to_user((void __user *)addr + offset, data, len);
 576         if (r)
 577                 return -EFAULT;
 578         mark_page_dirty(kvm, gfn);
 579         return 0;
 580 }
 581 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
 582
 583 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
 584                     unsigned long len)
 585 {
 586         gfn_t gfn = gpa >> PAGE_SHIFT;
 587         int seg;
 588         int offset = offset_in_page(gpa);
 589         int ret;
 590
 591         while ((seg = next_segment(len, offset)) != 0) {
 592                 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
 593                 if (ret < 0)
 594                         return ret;
 595                 offset = 0;
 596                 len -= seg;
 597                 data += seg;
 598                 ++gfn;
 599         }
 600         return 0;
 601 }
 602
 603 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
 604 {
 605         return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len);
 606 }
 607 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
 608
 609 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
 610 {
 611         gfn_t gfn = gpa >> PAGE_SHIFT;
 612         int seg;
 613         int offset = offset_in_page(gpa);
 614         int ret;
 615
 616         while ((seg = next_segment(len, offset)) != 0) {
 617                 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
 618                 if (ret < 0)
 619                         return ret;
 620                 offset = 0;
 621                 len -= seg;
 622                 ++gfn;
 623         }
 624         return 0;
 625 }
 626 EXPORT_SYMBOL_GPL(kvm_clear_guest);
 627
 628 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
 629 {
 630         struct kvm_memory_slot *memslot;
 631
 632         gfn = unalias_gfn(kvm, gfn);
 633         memslot = __gfn_to_memslot(kvm, gfn);
 634         if (memslot && memslot->dirty_bitmap) {
 635                 unsigned long rel_gfn = gfn - memslot->base_gfn;
 636
 637                 /* avoid RMW */
 638                 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
 639                         set_bit(rel_gfn, memslot->dirty_bitmap);
 640         }
 641 }
 642
 643 /*
 644  * The vCPU has executed a HLT instruction with in-kernel mode enabled.
 645  */
 646 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
 647 {
 648         DECLARE_WAITQUEUE(wait, current);
 649
 650         add_wait_queue(&vcpu->wq, &wait);
 651
 652         /*
 653          * We will block until either an interrupt or a signal wakes us up
 654          */
 655         while (!kvm_cpu_has_interrupt(vcpu)
 656                && !signal_pending(current)
 657                && vcpu->mp_state != VCPU_MP_STATE_RUNNABLE
 658                && vcpu->mp_state != VCPU_MP_STATE_SIPI_RECEIVED) {
 659                 set_current_state(TASK_INTERRUPTIBLE);
 660                 vcpu_put(vcpu);
 661                 schedule();
 662                 vcpu_load(vcpu);
 663         }
 664
 665         __set_current_state(TASK_RUNNING);
 666         remove_wait_queue(&vcpu->wq, &wait);
 667 }
 668
 669 void kvm_resched(struct kvm_vcpu *vcpu)
 670 {
 671         if (!need_resched())
 672                 return;
 673         cond_resched();
 674 }
 675 EXPORT_SYMBOL_GPL(kvm_resched);
 676
 677 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
 678                                     struct kvm_interrupt *irq)
 679 {
 680         if (irq->irq < 0 || irq->irq >= 256)
 681                 return -EINVAL;
 682         if (irqchip_in_kernel(vcpu->kvm))
 683                 return -ENXIO;
 684         vcpu_load(vcpu);
 685
 686         set_bit(irq->irq, vcpu->irq_pending);
 687         set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
 688
 689         vcpu_put(vcpu);
 690
 691         return 0;
 692 }
 693
 694 static struct page *kvm_vcpu_nopage(struct vm_area_struct *vma,
 695                                     unsigned long address,
 696                                     int *type)
 697 {
 698         struct kvm_vcpu *vcpu = vma->vm_file->private_data;
 699         unsigned long pgoff;
 700         struct page *page;
 701
 702         pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
 703         if (pgoff == 0)
 704                 page = virt_to_page(vcpu->run);
 705         else if (pgoff == KVM_PIO_PAGE_OFFSET)
 706                 page = virt_to_page(vcpu->pio_data);
 707         else
 708                 return NOPAGE_SIGBUS;
 709         get_page(page);
 710         if (type != NULL)
 711                 *type = VM_FAULT_MINOR;
 712
 713         return page;
 714 }
 715
 716 static struct vm_operations_struct kvm_vcpu_vm_ops = {
 717         .nopage = kvm_vcpu_nopage,
 718 };
 719
 720 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
 721 {
 722         vma->vm_ops = &kvm_vcpu_vm_ops;
 723         return 0;
 724 }
 725
 726 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
 727 {
 728         struct kvm_vcpu *vcpu = filp->private_data;
 729
 730         fput(vcpu->kvm->filp);
 731         return 0;
 732 }
 733
 734 static struct file_operations kvm_vcpu_fops = {
 735         .release        = kvm_vcpu_release,
 736         .unlocked_ioctl = kvm_vcpu_ioctl,
 737         .compat_ioctl   = kvm_vcpu_ioctl,
 738         .mmap           = kvm_vcpu_mmap,
 739 };
 740
 741 /*
 742  * Allocates an inode for the vcpu.
 743  */
 744 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
 745 {
 746         int fd, r;
 747         struct inode *inode;
 748         struct file *file;
 749
 750         r = anon_inode_getfd(&fd, &inode, &file,
 751                              "kvm-vcpu", &kvm_vcpu_fops, vcpu);
 752         if (r)
 753                 return r;
 754         atomic_inc(&vcpu->kvm->filp->f_count);
 755         return fd;
 756 }
 757
 758 /*
 759  * Creates some virtual cpus.  Good luck creating more than one.
 760  */
 761 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
 762 {
 763         int r;
 764         struct kvm_vcpu *vcpu;
 765
 766         if (!valid_vcpu(n))
 767                 return -EINVAL;
 768
 769         vcpu = kvm_arch_vcpu_create(kvm, n);
 770         if (IS_ERR(vcpu))
 771                 return PTR_ERR(vcpu);
 772
 773         preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
 774
 775         r = kvm_arch_vcpu_setup(vcpu);
 776         if (r)
 777                 goto vcpu_destroy;
 778
 779         mutex_lock(&kvm->lock);
 780         if (kvm->vcpus[n]) {
 781                 r = -EEXIST;
 782                 mutex_unlock(&kvm->lock);
 783                 goto vcpu_destroy;
 784         }
 785         kvm->vcpus[n] = vcpu;
 786         mutex_unlock(&kvm->lock);
 787
 788         /* Now it's all set up, let userspace reach it */
 789         r = create_vcpu_fd(vcpu);
 790         if (r < 0)
 791                 goto unlink;
 792         return r;
 793
 794 unlink:
 795         mutex_lock(&kvm->lock);
 796         kvm->vcpus[n] = NULL;
 797         mutex_unlock(&kvm->lock);
 798 vcpu_destroy:
 799         kvm_arch_vcpu_destroy(vcpu);
 800         return r;
 801 }
 802
 803 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
 804 {
 805         if (sigset) {
 806                 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
 807                 vcpu->sigset_active = 1;
 808                 vcpu->sigset = *sigset;
 809         } else
 810                 vcpu->sigset_active = 0;
 811         return 0;
 812 }
 813
 814 static long kvm_vcpu_ioctl(struct file *filp,
 815                            unsigned int ioctl, unsigned long arg)
 816 {
 817         struct kvm_vcpu *vcpu = filp->private_data;
 818         void __user *argp = (void __user *)arg;
 819         int r;
 820
 821         switch (ioctl) {
 822         case KVM_RUN:
 823                 r = -EINVAL;
 824                 if (arg)
 825                         goto out;
 826                 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
 827                 break;
 828         case KVM_GET_REGS: {
 829                 struct kvm_regs kvm_regs;
 830
 831                 memset(&kvm_regs, 0, sizeof kvm_regs);
 832                 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, &kvm_regs);
 833                 if (r)
 834                         goto out;
 835                 r = -EFAULT;
 836                 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
 837                         goto out;
 838                 r = 0;
 839                 break;
 840         }
 841         case KVM_SET_REGS: {
 842                 struct kvm_regs kvm_regs;
 843
 844                 r = -EFAULT;
 845                 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
 846                         goto out;
 847                 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, &kvm_regs);
 848                 if (r)
 849                         goto out;
 850                 r = 0;
 851                 break;
 852         }
 853         case KVM_GET_SREGS: {
 854                 struct kvm_sregs kvm_sregs;
 855
 856                 memset(&kvm_sregs, 0, sizeof kvm_sregs);
 857                 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs);
 858                 if (r)
 859                         goto out;
 860                 r = -EFAULT;
 861                 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
 862                         goto out;
 863                 r = 0;
 864                 break;
 865         }
 866         case KVM_SET_SREGS: {
 867                 struct kvm_sregs kvm_sregs;
 868
 869                 r = -EFAULT;
 870                 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
 871                         goto out;
 872                 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs);
 873                 if (r)
 874                         goto out;
 875                 r = 0;
 876                 break;
 877         }
 878         case KVM_TRANSLATE: {
 879                 struct kvm_translation tr;
 880
 881                 r = -EFAULT;
 882                 if (copy_from_user(&tr, argp, sizeof tr))
 883                         goto out;
 884                 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
 885                 if (r)
 886                         goto out;
 887                 r = -EFAULT;
 888                 if (copy_to_user(argp, &tr, sizeof tr))
 889                         goto out;
 890                 r = 0;
 891                 break;
 892         }
 893         case KVM_INTERRUPT: {
 894                 struct kvm_interrupt irq;
 895
 896                 r = -EFAULT;
 897                 if (copy_from_user(&irq, argp, sizeof irq))
 898                         goto out;
 899                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 900                 if (r)
 901                         goto out;
 902                 r = 0;
 903                 break;
 904         }
 905         case KVM_DEBUG_GUEST: {
 906                 struct kvm_debug_guest dbg;
 907
 908                 r = -EFAULT;
 909                 if (copy_from_user(&dbg, argp, sizeof dbg))
 910                         goto out;
 911                 r = kvm_arch_vcpu_ioctl_debug_guest(vcpu, &dbg);
 912                 if (r)
 913                         goto out;
 914                 r = 0;
 915                 break;
 916         }
 917         case KVM_SET_SIGNAL_MASK: {
 918                 struct kvm_signal_mask __user *sigmask_arg = argp;
 919                 struct kvm_signal_mask kvm_sigmask;
 920                 sigset_t sigset, *p;
 921
 922                 p = NULL;
 923                 if (argp) {
 924                         r = -EFAULT;
 925                         if (copy_from_user(&kvm_sigmask, argp,
 926                                            sizeof kvm_sigmask))
 927                                 goto out;
 928                         r = -EINVAL;
 929                         if (kvm_sigmask.len != sizeof sigset)
 930                                 goto out;
 931                         r = -EFAULT;
 932                         if (copy_from_user(&sigset, sigmask_arg->sigset,
 933                                            sizeof sigset))
 934                                 goto out;
 935                         p = &sigset;
 936                 }
 937                 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
 938                 break;
 939         }
 940         case KVM_GET_FPU: {
 941                 struct kvm_fpu fpu;
 942
 943                 memset(&fpu, 0, sizeof fpu);
 944                 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, &fpu);
 945                 if (r)
 946                         goto out;
 947                 r = -EFAULT;
 948                 if (copy_to_user(argp, &fpu, sizeof fpu))
 949                         goto out;
 950                 r = 0;
 951                 break;
 952         }
 953         case KVM_SET_FPU: {
 954                 struct kvm_fpu fpu;
 955
 956                 r = -EFAULT;
 957                 if (copy_from_user(&fpu, argp, sizeof fpu))
 958                         goto out;
 959                 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, &fpu);
 960                 if (r)
 961                         goto out;
 962                 r = 0;
 963                 break;
 964         }
 965         default:
 966                 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
 967         }
 968 out:
 969         return r;
 970 }
 971
 972 static long kvm_vm_ioctl(struct file *filp,
 973                            unsigned int ioctl, unsigned long arg)
 974 {
 975         struct kvm *kvm = filp->private_data;
 976         void __user *argp = (void __user *)arg;
 977         int r;
 978
 979         switch (ioctl) {
 980         case KVM_CREATE_VCPU:
 981                 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
 982                 if (r < 0)
 983                         goto out;
 984                 break;
 985         case KVM_SET_USER_MEMORY_REGION: {
 986                 struct kvm_userspace_memory_region kvm_userspace_mem;
 987
 988                 r = -EFAULT;
 989                 if (copy_from_user(&kvm_userspace_mem, argp,
 990                                                 sizeof kvm_userspace_mem))
 991                         goto out;
 992
 993                 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
 994                 if (r)
 995                         goto out;
 996                 break;
 997         }
 998         case KVM_GET_DIRTY_LOG: {
 999                 struct kvm_dirty_log log;
1000
1001                 r = -EFAULT;
1002                 if (copy_from_user(&log, argp, sizeof log))
1003                         goto out;
1004                 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
1005                 if (r)
1006                         goto out;
1007                 break;
1008         }
1009         default:
1010                 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
1011         }
1012 out:
1013         return r;
1014 }
1015
1016 static struct page *kvm_vm_nopage(struct vm_area_struct *vma,
1017                                   unsigned long address,
1018                                   int *type)
1019 {
1020         struct kvm *kvm = vma->vm_file->private_data;
1021         unsigned long pgoff;
1022         struct page *page;
1023
1024         pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
1025         if (!kvm_is_visible_gfn(kvm, pgoff))
1026                 return NOPAGE_SIGBUS;
1027         /* current->mm->mmap_sem is already held so call lockless version */
1028         page = __gfn_to_page(kvm, pgoff);
1029         if (is_error_page(page)) {
1030                 kvm_release_page_clean(page);
1031                 return NOPAGE_SIGBUS;
1032         }
1033         if (type != NULL)
1034                 *type = VM_FAULT_MINOR;
1035
1036         return page;
1037 }
1038
1039 static struct vm_operations_struct kvm_vm_vm_ops = {
1040         .nopage = kvm_vm_nopage,
1041 };
1042
1043 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
1044 {
1045         vma->vm_ops = &kvm_vm_vm_ops;
1046         return 0;
1047 }
1048
1049 static struct file_operations kvm_vm_fops = {
1050         .release        = kvm_vm_release,
1051         .unlocked_ioctl = kvm_vm_ioctl,
1052         .compat_ioctl   = kvm_vm_ioctl,
1053         .mmap           = kvm_vm_mmap,
1054 };
1055
1056 static int kvm_dev_ioctl_create_vm(void)
1057 {
1058         int fd, r;
1059         struct inode *inode;
1060         struct file *file;
1061         struct kvm *kvm;
1062
1063         kvm = kvm_create_vm();
1064         if (IS_ERR(kvm))
1065                 return PTR_ERR(kvm);
1066         r = anon_inode_getfd(&fd, &inode, &file, "kvm-vm", &kvm_vm_fops, kvm);
1067         if (r) {
1068                 kvm_destroy_vm(kvm);
1069                 return r;
1070         }
1071
1072         kvm->filp = file;
1073
1074         return fd;
1075 }
1076
1077 static long kvm_dev_ioctl(struct file *filp,
1078                           unsigned int ioctl, unsigned long arg)
1079 {
1080         void __user *argp = (void __user *)arg;
1081         long r = -EINVAL;
1082
1083         switch (ioctl) {
1084         case KVM_GET_API_VERSION:
1085                 r = -EINVAL;
1086                 if (arg)
1087                         goto out;
1088                 r = KVM_API_VERSION;
1089                 break;
1090         case KVM_CREATE_VM:
1091                 r = -EINVAL;
1092                 if (arg)
1093                         goto out;
1094                 r = kvm_dev_ioctl_create_vm();
1095                 break;
1096         case KVM_CHECK_EXTENSION:
1097                 r = kvm_dev_ioctl_check_extension((long)argp);
1098                 break;
1099         case KVM_GET_VCPU_MMAP_SIZE:
1100                 r = -EINVAL;
1101                 if (arg)
1102                         goto out;
1103                 r = 2 * PAGE_SIZE;
1104                 break;
1105         default:
1106                 return kvm_arch_dev_ioctl(filp, ioctl, arg);
1107         }
1108 out:
1109         return r;
1110 }
1111
1112 static struct file_operations kvm_chardev_ops = {
1113         .unlocked_ioctl = kvm_dev_ioctl,
1114         .compat_ioctl   = kvm_dev_ioctl,
1115 };
1116
1117 static struct miscdevice kvm_dev = {
1118         KVM_MINOR,
1119         "kvm",
1120         &kvm_chardev_ops,
1121 };
1122
1123 static void hardware_enable(void *junk)
1124 {
1125         int cpu = raw_smp_processor_id();
1126
1127         if (cpu_isset(cpu, cpus_hardware_enabled))
1128                 return;
1129         cpu_set(cpu, cpus_hardware_enabled);
1130         kvm_arch_hardware_enable(NULL);
1131 }
1132
1133 static void hardware_disable(void *junk)
1134 {
1135         int cpu = raw_smp_processor_id();
1136
1137         if (!cpu_isset(cpu, cpus_hardware_enabled))
1138                 return;
1139         cpu_clear(cpu, cpus_hardware_enabled);
1140         decache_vcpus_on_cpu(cpu);
1141         kvm_arch_hardware_disable(NULL);
1142 }
1143
1144 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
1145                            void *v)
1146 {
1147         int cpu = (long)v;
1148
1149         val &= ~CPU_TASKS_FROZEN;
1150         switch (val) {
1151         case CPU_DYING:
1152                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
1153                        cpu);
1154                 hardware_disable(NULL);
1155                 break;
1156         case CPU_UP_CANCELED:
1157                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
1158                        cpu);
1159                 smp_call_function_single(cpu, hardware_disable, NULL, 0, 1);
1160                 break;
1161         case CPU_ONLINE:
1162                 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
1163                        cpu);
1164                 smp_call_function_single(cpu, hardware_enable, NULL, 0, 1);
1165                 break;
1166         }
1167         return NOTIFY_OK;
1168 }
1169
1170 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
1171                       void *v)
1172 {
1173         if (val == SYS_RESTART) {
1174                 /*
1175                  * Some (well, at least mine) BIOSes hang on reboot if
1176                  * in vmx root mode.
1177                  */
1178                 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
1179                 on_each_cpu(hardware_disable, NULL, 0, 1);
1180         }
1181         return NOTIFY_OK;
1182 }
1183
1184 static struct notifier_block kvm_reboot_notifier = {
1185         .notifier_call = kvm_reboot,
1186         .priority = 0,
1187 };
1188
1189 void kvm_io_bus_init(struct kvm_io_bus *bus)
1190 {
1191         memset(bus, 0, sizeof(*bus));
1192 }
1193
1194 void kvm_io_bus_destroy(struct kvm_io_bus *bus)
1195 {
1196         int i;
1197
1198         for (i = 0; i < bus->dev_count; i++) {
1199                 struct kvm_io_device *pos = bus->devs[i];
1200
1201                 kvm_iodevice_destructor(pos);
1202         }
1203 }
1204
1205 struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr)
1206 {
1207         int i;
1208
1209         for (i = 0; i < bus->dev_count; i++) {
1210                 struct kvm_io_device *pos = bus->devs[i];
1211
1212                 if (pos->in_range(pos, addr))
1213                         return pos;
1214         }
1215
1216         return NULL;
1217 }
1218
1219 void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev)
1220 {
1221         BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1));
1222
1223         bus->devs[bus->dev_count++] = dev;
1224 }
1225
1226 static struct notifier_block kvm_cpu_notifier = {
1227         .notifier_call = kvm_cpu_hotplug,
1228         .priority = 20, /* must be > scheduler priority */
1229 };
1230
1231 static u64 vm_stat_get(void *_offset)
1232 {
1233         unsigned offset = (long)_offset;
1234         u64 total = 0;
1235         struct kvm *kvm;
1236
1237         spin_lock(&kvm_lock);
1238         list_for_each_entry(kvm, &vm_list, vm_list)
1239                 total += *(u32 *)((void *)kvm + offset);
1240         spin_unlock(&kvm_lock);
1241         return total;
1242 }
1243
1244 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
1245
1246 static u64 vcpu_stat_get(void *_offset)
1247 {
1248         unsigned offset = (long)_offset;
1249         u64 total = 0;
1250         struct kvm *kvm;
1251         struct kvm_vcpu *vcpu;
1252         int i;
1253
1254         spin_lock(&kvm_lock);
1255         list_for_each_entry(kvm, &vm_list, vm_list)
1256                 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
1257                         vcpu = kvm->vcpus[i];
1258                         if (vcpu)
1259                                 total += *(u32 *)((void *)vcpu + offset);
1260                 }
1261         spin_unlock(&kvm_lock);
1262         return total;
1263 }
1264
1265 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
1266
1267 static struct file_operations *stat_fops[] = {
1268         [KVM_STAT_VCPU] = &vcpu_stat_fops,
1269         [KVM_STAT_VM]   = &vm_stat_fops,
1270 };
1271
1272 static void kvm_init_debug(void)
1273 {
1274         struct kvm_stats_debugfs_item *p;
1275
1276         debugfs_dir = debugfs_create_dir("kvm", NULL);
1277         for (p = debugfs_entries; p->name; ++p)
1278                 p->dentry = debugfs_create_file(p->name, 0444, debugfs_dir,
1279                                                 (void *)(long)p->offset,
1280                                                 stat_fops[p->kind]);
1281 }
1282
1283 static void kvm_exit_debug(void)
1284 {
1285         struct kvm_stats_debugfs_item *p;
1286
1287         for (p = debugfs_entries; p->name; ++p)
1288                 debugfs_remove(p->dentry);
1289         debugfs_remove(debugfs_dir);
1290 }
1291
1292 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
1293 {
1294         hardware_disable(NULL);
1295         return 0;
1296 }
1297
1298 static int kvm_resume(struct sys_device *dev)
1299 {
1300         hardware_enable(NULL);
1301         return 0;
1302 }
1303
1304 static struct sysdev_class kvm_sysdev_class = {
1305         .name = "kvm",
1306         .suspend = kvm_suspend,
1307         .resume = kvm_resume,
1308 };
1309
1310 static struct sys_device kvm_sysdev = {
1311         .id = 0,
1312         .cls = &kvm_sysdev_class,
1313 };
1314
1315 struct page *bad_page;
1316
1317 static inline
1318 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
1319 {
1320         return container_of(pn, struct kvm_vcpu, preempt_notifier);
1321 }
1322
1323 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
1324 {
1325         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
1326
1327         kvm_arch_vcpu_load(vcpu, cpu);
1328 }
1329
1330 static void kvm_sched_out(struct preempt_notifier *pn,
1331                           struct task_struct *next)
1332 {
1333         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
1334
1335         kvm_arch_vcpu_put(vcpu);
1336 }
1337
1338 int kvm_init(void *opaque, unsigned int vcpu_size,
1339                   struct module *module)
1340 {
1341         int r;
1342         int cpu;
1343
1344         kvm_init_debug();
1345
1346         r = kvm_arch_init(opaque);
1347         if (r)
1348                 goto out4;
1349
1350         bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
1351
1352         if (bad_page == NULL) {
1353                 r = -ENOMEM;
1354                 goto out;
1355         }
1356
1357         r = kvm_arch_hardware_setup();
1358         if (r < 0)
1359                 goto out;
1360
1361         for_each_online_cpu(cpu) {
1362                 smp_call_function_single(cpu,
1363                                 kvm_arch_check_processor_compat,
1364                                 &r, 0, 1);
1365                 if (r < 0)
1366                         goto out_free_0;
1367         }
1368
1369         on_each_cpu(hardware_enable, NULL, 0, 1);
1370         r = register_cpu_notifier(&kvm_cpu_notifier);
1371         if (r)
1372                 goto out_free_1;
1373         register_reboot_notifier(&kvm_reboot_notifier);
1374
1375         r = sysdev_class_register(&kvm_sysdev_class);
1376         if (r)
1377                 goto out_free_2;
1378
1379         r = sysdev_register(&kvm_sysdev);
1380         if (r)
1381                 goto out_free_3;
1382
1383         /* A kmem cache lets us meet the alignment requirements of fx_save. */
1384         kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
1385                                            __alignof__(struct kvm_vcpu),
1386                                            0, NULL);
1387         if (!kvm_vcpu_cache) {
1388                 r = -ENOMEM;
1389                 goto out_free_4;
1390         }
1391
1392         kvm_chardev_ops.owner = module;
1393
1394         r = misc_register(&kvm_dev);
1395         if (r) {
1396                 printk(KERN_ERR "kvm: misc device register failed\n");
1397                 goto out_free;
1398         }
1399
1400         kvm_preempt_ops.sched_in = kvm_sched_in;
1401         kvm_preempt_ops.sched_out = kvm_sched_out;
1402
1403         return 0;
1404
1405 out_free:
1406         kmem_cache_destroy(kvm_vcpu_cache);
1407 out_free_4:
1408         sysdev_unregister(&kvm_sysdev);
1409 out_free_3:
1410         sysdev_class_unregister(&kvm_sysdev_class);
1411 out_free_2:
1412         unregister_reboot_notifier(&kvm_reboot_notifier);
1413         unregister_cpu_notifier(&kvm_cpu_notifier);
1414 out_free_1:
1415         on_each_cpu(hardware_disable, NULL, 0, 1);
1416 out_free_0:
1417         kvm_arch_hardware_unsetup();
1418 out:
1419         kvm_arch_exit();
1420         kvm_exit_debug();
1421 out4:
1422         return r;
1423 }
1424 EXPORT_SYMBOL_GPL(kvm_init);
1425
1426 void kvm_exit(void)
1427 {
1428         misc_deregister(&kvm_dev);
1429         kmem_cache_destroy(kvm_vcpu_cache);
1430         sysdev_unregister(&kvm_sysdev);
1431         sysdev_class_unregister(&kvm_sysdev_class);
1432         unregister_reboot_notifier(&kvm_reboot_notifier);
1433         unregister_cpu_notifier(&kvm_cpu_notifier);
1434         on_each_cpu(hardware_disable, NULL, 0, 1);
1435         kvm_arch_hardware_unsetup();
1436         kvm_arch_exit();
1437         kvm_exit_debug();
1438         __free_page(bad_page);
1439 }
1440 EXPORT_SYMBOL_GPL(kvm_exit);