SAFE public projects git trees. - safe/jmp/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
  50 MODULE_AUTHOR("Qumranet");
  51 MODULE_LICENSE("GPL");
  52
  53 DEFINE_SPINLOCK(kvm_lock);
  54 LIST_HEAD(vm_list);
  55
  56 static cpumask_t cpus_hardware_enabled;
  57
  58 struct kmem_cache *kvm_vcpu_cache;
  59 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
  60
  61 static __read_mostly struct preempt_ops kvm_preempt_ops;
  62
  63 static struct dentry *debugfs_dir;
  64
  65 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
  66                            unsigned long arg);
  67
  68 static inline int valid_vcpu(int n)
  69 {
  70         return likely(n >= 0 && n < KVM_MAX_VCPUS);
  71 }
  72
  73 /*
  74  * Switches to specified vcpu, until a matching vcpu_put()
  75  */
  76 void vcpu_load(struct kvm_vcpu *vcpu)
  77 {
  78         int cpu;
  79
  80         mutex_lock(&vcpu->mutex);
  81         cpu = get_cpu();
  82         preempt_notifier_register(&vcpu->preempt_notifier);
  83         kvm_arch_vcpu_load(vcpu, cpu);
  84         put_cpu();
  85 }
  86
  87 void vcpu_put(struct kvm_vcpu *vcpu)
  88 {
  89         preempt_disable();
  90         kvm_arch_vcpu_put(vcpu);
  91         preempt_notifier_unregister(&vcpu->preempt_notifier);
  92         preempt_enable();
  93         mutex_unlock(&vcpu->mutex);
  94 }
  95
  96 static void ack_flush(void *_completed)
  97 {
  98 }
  99
 100 void kvm_flush_remote_tlbs(struct kvm *kvm)
 101 {
 102         int i, cpu;
 103         cpumask_t cpus;
 104         struct kvm_vcpu *vcpu;
 105
 106         cpus_clear(cpus);
 107         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 108                 vcpu = kvm->vcpus[i];
 109                 if (!vcpu)
 110                         continue;
 111                 if (test_and_set_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests))
 112                         continue;
 113                 cpu = vcpu->cpu;
 114                 if (cpu != -1 && cpu != raw_smp_processor_id())
 115                         cpu_set(cpu, cpus);
 116         }
 117         smp_call_function_mask(cpus, ack_flush, NULL, 1);
 118 }
 119
 120 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
 121 {
 122         struct page *page;
 123         int r;
 124
 125         mutex_init(&vcpu->mutex);
 126         vcpu->cpu = -1;
 127         vcpu->kvm = kvm;
 128         vcpu->vcpu_id = id;
 129         init_waitqueue_head(&vcpu->wq);
 130
 131         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 132         if (!page) {
 133                 r = -ENOMEM;
 134                 goto fail;
 135         }
 136         vcpu->run = page_address(page);
 137
 138         r = kvm_arch_vcpu_init(vcpu);
 139         if (r < 0)
 140                 goto fail_free_run;
 141         return 0;
 142
 143 fail_free_run:
 144         free_page((unsigned long)vcpu->run);
 145 fail:
 146         return r;
 147 }
 148 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
 149
 150 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
 151 {
 152         kvm_arch_vcpu_uninit(vcpu);
 153         free_page((unsigned long)vcpu->run);
 154 }
 155 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
 156
 157 static struct kvm *kvm_create_vm(void)
 158 {
 159         struct kvm *kvm = kvm_arch_create_vm();
 160
 161         if (IS_ERR(kvm))
 162                 goto out;
 163
 164         kvm_io_bus_init(&kvm->pio_bus);
 165         mutex_init(&kvm->lock);
 166         kvm_io_bus_init(&kvm->mmio_bus);
 167         spin_lock(&kvm_lock);
 168         list_add(&kvm->vm_list, &vm_list);
 169         spin_unlock(&kvm_lock);
 170 out:
 171         return kvm;
 172 }
 173
 174 /*
 175  * Free any memory in @free but not in @dont.
 176  */
 177 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
 178                                   struct kvm_memory_slot *dont)
 179 {
 180         if (!dont || free->rmap != dont->rmap)
 181                 vfree(free->rmap);
 182
 183         if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
 184                 vfree(free->dirty_bitmap);
 185
 186         free->npages = 0;
 187         free->dirty_bitmap = NULL;
 188         free->rmap = NULL;
 189 }
 190
 191 void kvm_free_physmem(struct kvm *kvm)
 192 {
 193         int i;
 194
 195         for (i = 0; i < kvm->nmemslots; ++i)
 196                 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
 197 }
 198
 199 static void kvm_destroy_vm(struct kvm *kvm)
 200 {
 201         spin_lock(&kvm_lock);
 202         list_del(&kvm->vm_list);
 203         spin_unlock(&kvm_lock);
 204         kvm_io_bus_destroy(&kvm->pio_bus);
 205         kvm_io_bus_destroy(&kvm->mmio_bus);
 206         kvm_arch_destroy_vm(kvm);
 207 }
 208
 209 static int kvm_vm_release(struct inode *inode, struct file *filp)
 210 {
 211         struct kvm *kvm = filp->private_data;
 212
 213         kvm_destroy_vm(kvm);
 214         return 0;
 215 }
 216
 217 /*
 218  * Allocate some memory and give it an address in the guest physical address
 219  * space.
 220  *
 221  * Discontiguous memory is allowed, mostly for framebuffers.
 222  *
 223  * Must be called holding kvm->lock.
 224  */
 225 int __kvm_set_memory_region(struct kvm *kvm,
 226                             struct kvm_userspace_memory_region *mem,
 227                             int user_alloc)
 228 {
 229         int r;
 230         gfn_t base_gfn;
 231         unsigned long npages;
 232         unsigned long i;
 233         struct kvm_memory_slot *memslot;
 234         struct kvm_memory_slot old, new;
 235
 236         r = -EINVAL;
 237         /* General sanity checks */
 238         if (mem->memory_size & (PAGE_SIZE - 1))
 239                 goto out;
 240         if (mem->guest_phys_addr & (PAGE_SIZE - 1))
 241                 goto out;
 242         if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
 243                 goto out;
 244         if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
 245                 goto out;
 246
 247         memslot = &kvm->memslots[mem->slot];
 248         base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
 249         npages = mem->memory_size >> PAGE_SHIFT;
 250
 251         if (!npages)
 252                 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
 253
 254         new = old = *memslot;
 255
 256         new.base_gfn = base_gfn;
 257         new.npages = npages;
 258         new.flags = mem->flags;
 259
 260         /* Disallow changing a memory slot's size. */
 261         r = -EINVAL;
 262         if (npages && old.npages && npages != old.npages)
 263                 goto out_free;
 264
 265         /* Check for overlaps */
 266         r = -EEXIST;
 267         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
 268                 struct kvm_memory_slot *s = &kvm->memslots[i];
 269
 270                 if (s == memslot)
 271                         continue;
 272                 if (!((base_gfn + npages <= s->base_gfn) ||
 273                       (base_gfn >= s->base_gfn + s->npages)))
 274                         goto out_free;
 275         }
 276
 277         /* Free page dirty bitmap if unneeded */
 278         if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
 279                 new.dirty_bitmap = NULL;
 280
 281         r = -ENOMEM;
 282
 283         /* Allocate if a slot is being created */
 284         if (npages && !new.rmap) {
 285                 new.rmap = vmalloc(npages * sizeof(struct page *));
 286
 287                 if (!new.rmap)
 288                         goto out_free;
 289
 290                 memset(new.rmap, 0, npages * sizeof(*new.rmap));
 291
 292                 new.user_alloc = user_alloc;
 293                 if (user_alloc)
 294                         new.userspace_addr = mem->userspace_addr;
 295                 else {
 296                         down_write(&current->mm->mmap_sem);
 297                         new.userspace_addr = do_mmap(NULL, 0,
 298                                                      npages * PAGE_SIZE,
 299                                                      PROT_READ | PROT_WRITE,
 300                                                      MAP_SHARED | MAP_ANONYMOUS,
 301                                                      0);
 302                         up_write(&current->mm->mmap_sem);
 303
 304                         if (IS_ERR((void *)new.userspace_addr))
 305                                 goto out_free;
 306                 }
 307         } else {
 308                 if (!old.user_alloc && old.rmap) {
 309                         int ret;
 310
 311                         down_write(&current->mm->mmap_sem);
 312                         ret = do_munmap(current->mm, old.userspace_addr,
 313                                         old.npages * PAGE_SIZE);
 314                         up_write(&current->mm->mmap_sem);
 315                         if (ret < 0)
 316                                 printk(KERN_WARNING
 317                                        "kvm_vm_ioctl_set_memory_region: "
 318                                        "failed to munmap memory\n");
 319                 }
 320         }
 321
 322         /* Allocate page dirty bitmap if needed */
 323         if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
 324                 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
 325
 326                 new.dirty_bitmap = vmalloc(dirty_bytes);
 327                 if (!new.dirty_bitmap)
 328                         goto out_free;
 329                 memset(new.dirty_bitmap, 0, dirty_bytes);
 330         }
 331
 332         if (mem->slot >= kvm->nmemslots)
 333                 kvm->nmemslots = mem->slot + 1;
 334
 335         if (!kvm->n_requested_mmu_pages) {
 336                 unsigned int n_pages;
 337
 338                 if (npages) {
 339                         n_pages = npages * KVM_PERMILLE_MMU_PAGES / 1000;
 340                         kvm_mmu_change_mmu_pages(kvm, kvm->n_alloc_mmu_pages +
 341                                                  n_pages);
 342                 } else {
 343                         unsigned int nr_mmu_pages;
 344
 345                         n_pages = old.npages * KVM_PERMILLE_MMU_PAGES / 1000;
 346                         nr_mmu_pages = kvm->n_alloc_mmu_pages - n_pages;
 347                         nr_mmu_pages = max(nr_mmu_pages,
 348                                         (unsigned int) KVM_MIN_ALLOC_MMU_PAGES);
 349                         kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
 350                 }
 351         }
 352
 353         *memslot = new;
 354
 355         kvm_mmu_slot_remove_write_access(kvm, mem->slot);
 356         kvm_flush_remote_tlbs(kvm);
 357
 358         kvm_free_physmem_slot(&old, &new);
 359         return 0;
 360
 361 out_free:
 362         kvm_free_physmem_slot(&new, &old);
 363 out:
 364         return r;
 365
 366 }
 367 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
 368
 369 int kvm_set_memory_region(struct kvm *kvm,
 370                           struct kvm_userspace_memory_region *mem,
 371                           int user_alloc)
 372 {
 373         int r;
 374
 375         mutex_lock(&kvm->lock);
 376         r = __kvm_set_memory_region(kvm, mem, user_alloc);
 377         mutex_unlock(&kvm->lock);
 378         return r;
 379 }
 380 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
 381
 382 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
 383                                    struct
 384                                    kvm_userspace_memory_region *mem,
 385                                    int user_alloc)
 386 {
 387         if (mem->slot >= KVM_MEMORY_SLOTS)
 388                 return -EINVAL;
 389         return kvm_set_memory_region(kvm, mem, user_alloc);
 390 }
 391
 392 /*
 393  * Get (and clear) the dirty memory log for a memory slot.
 394  */
 395 static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
 396                                       struct kvm_dirty_log *log)
 397 {
 398         struct kvm_memory_slot *memslot;
 399         int r, i;
 400         int n;
 401         unsigned long any = 0;
 402
 403         mutex_lock(&kvm->lock);
 404
 405         r = -EINVAL;
 406         if (log->slot >= KVM_MEMORY_SLOTS)
 407                 goto out;
 408
 409         memslot = &kvm->memslots[log->slot];
 410         r = -ENOENT;
 411         if (!memslot->dirty_bitmap)
 412                 goto out;
 413
 414         n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
 415
 416         for (i = 0; !any && i < n/sizeof(long); ++i)
 417                 any = memslot->dirty_bitmap[i];
 418
 419         r = -EFAULT;
 420         if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
 421                 goto out;
 422
 423         /* If nothing is dirty, don't bother messing with page tables. */
 424         if (any) {
 425                 kvm_mmu_slot_remove_write_access(kvm, log->slot);
 426                 kvm_flush_remote_tlbs(kvm);
 427                 memset(memslot->dirty_bitmap, 0, n);
 428         }
 429
 430         r = 0;
 431
 432 out:
 433         mutex_unlock(&kvm->lock);
 434         return r;
 435 }
 436
 437 int is_error_page(struct page *page)
 438 {
 439         return page == bad_page;
 440 }
 441 EXPORT_SYMBOL_GPL(is_error_page);
 442
 443 static inline unsigned long bad_hva(void)
 444 {
 445         return PAGE_OFFSET;
 446 }
 447
 448 int kvm_is_error_hva(unsigned long addr)
 449 {
 450         return addr == bad_hva();
 451 }
 452 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
 453
 454 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
 455 {
 456         int i;
 457         struct kvm_mem_alias *alias;
 458
 459         for (i = 0; i < kvm->naliases; ++i) {
 460                 alias = &kvm->aliases[i];
 461                 if (gfn >= alias->base_gfn
 462                     && gfn < alias->base_gfn + alias->npages)
 463                         return alias->target_gfn + gfn - alias->base_gfn;
 464         }
 465         return gfn;
 466 }
 467
 468 static struct kvm_memory_slot *__gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
 469 {
 470         int i;
 471
 472         for (i = 0; i < kvm->nmemslots; ++i) {
 473                 struct kvm_memory_slot *memslot = &kvm->memslots[i];
 474
 475                 if (gfn >= memslot->base_gfn
 476                     && gfn < memslot->base_gfn + memslot->npages)
 477                         return memslot;
 478         }
 479         return NULL;
 480 }
 481
 482 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
 483 {
 484         gfn = unalias_gfn(kvm, gfn);
 485         return __gfn_to_memslot(kvm, gfn);
 486 }
 487
 488 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
 489 {
 490         int i;
 491
 492         gfn = unalias_gfn(kvm, gfn);
 493         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
 494                 struct kvm_memory_slot *memslot = &kvm->memslots[i];
 495
 496                 if (gfn >= memslot->base_gfn
 497                     && gfn < memslot->base_gfn + memslot->npages)
 498                         return 1;
 499         }
 500         return 0;
 501 }
 502 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
 503
 504 static unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
 505 {
 506         struct kvm_memory_slot *slot;
 507
 508         gfn = unalias_gfn(kvm, gfn);
 509         slot = __gfn_to_memslot(kvm, gfn);
 510         if (!slot)
 511                 return bad_hva();
 512         return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE);
 513 }
 514
 515 /*
 516  * Requires current->mm->mmap_sem to be held
 517  */
 518 static struct page *__gfn_to_page(struct kvm *kvm, gfn_t gfn)
 519 {
 520         struct page *page[1];
 521         unsigned long addr;
 522         int npages;
 523
 524         might_sleep();
 525
 526         addr = gfn_to_hva(kvm, gfn);
 527         if (kvm_is_error_hva(addr)) {
 528                 get_page(bad_page);
 529                 return bad_page;
 530         }
 531
 532         npages = get_user_pages(current, current->mm, addr, 1, 1, 1, page,
 533                                 NULL);
 534
 535         if (npages != 1) {
 536                 get_page(bad_page);
 537                 return bad_page;
 538         }
 539
 540         return page[0];
 541 }
 542
 543 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
 544 {
 545         struct page *page;
 546
 547         down_read(&current->mm->mmap_sem);
 548         page = __gfn_to_page(kvm, gfn);
 549         up_read(&current->mm->mmap_sem);
 550
 551         return page;
 552 }
 553
 554 EXPORT_SYMBOL_GPL(gfn_to_page);
 555
 556 void kvm_release_page(struct page *page)
 557 {
 558         if (!PageReserved(page))
 559                 SetPageDirty(page);
 560         put_page(page);
 561 }
 562 EXPORT_SYMBOL_GPL(kvm_release_page);
 563
 564 static int next_segment(unsigned long len, int offset)
 565 {
 566         if (len > PAGE_SIZE - offset)
 567                 return PAGE_SIZE - offset;
 568         else
 569                 return len;
 570 }
 571
 572 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
 573                         int len)
 574 {
 575         int r;
 576         unsigned long addr;
 577
 578         addr = gfn_to_hva(kvm, gfn);
 579         if (kvm_is_error_hva(addr))
 580                 return -EFAULT;
 581         r = copy_from_user(data, (void __user *)addr + offset, len);
 582         if (r)
 583                 return -EFAULT;
 584         return 0;
 585 }
 586 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
 587
 588 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
 589 {
 590         gfn_t gfn = gpa >> PAGE_SHIFT;
 591         int seg;
 592         int offset = offset_in_page(gpa);
 593         int ret;
 594
 595         while ((seg = next_segment(len, offset)) != 0) {
 596                 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
 597                 if (ret < 0)
 598                         return ret;
 599                 offset = 0;
 600                 len -= seg;
 601                 data += seg;
 602                 ++gfn;
 603         }
 604         return 0;
 605 }
 606 EXPORT_SYMBOL_GPL(kvm_read_guest);
 607
 608 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
 609                          int offset, int len)
 610 {
 611         int r;
 612         unsigned long addr;
 613
 614         addr = gfn_to_hva(kvm, gfn);
 615         if (kvm_is_error_hva(addr))
 616                 return -EFAULT;
 617         r = copy_to_user((void __user *)addr + offset, data, len);
 618         if (r)
 619                 return -EFAULT;
 620         mark_page_dirty(kvm, gfn);
 621         return 0;
 622 }
 623 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
 624
 625 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
 626                     unsigned long len)
 627 {
 628         gfn_t gfn = gpa >> PAGE_SHIFT;
 629         int seg;
 630         int offset = offset_in_page(gpa);
 631         int ret;
 632
 633         while ((seg = next_segment(len, offset)) != 0) {
 634                 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
 635                 if (ret < 0)
 636                         return ret;
 637                 offset = 0;
 638                 len -= seg;
 639                 data += seg;
 640                 ++gfn;
 641         }
 642         return 0;
 643 }
 644
 645 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
 646 {
 647         void *page_virt;
 648         struct page *page;
 649
 650         page = gfn_to_page(kvm, gfn);
 651         if (is_error_page(page)) {
 652                 kvm_release_page(page);
 653                 return -EFAULT;
 654         }
 655         page_virt = kmap_atomic(page, KM_USER0);
 656
 657         memset(page_virt + offset, 0, len);
 658
 659         kunmap_atomic(page_virt, KM_USER0);
 660         kvm_release_page(page);
 661         mark_page_dirty(kvm, gfn);
 662         return 0;
 663 }
 664 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
 665
 666 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
 667 {
 668         gfn_t gfn = gpa >> PAGE_SHIFT;
 669         int seg;
 670         int offset = offset_in_page(gpa);
 671         int ret;
 672
 673         while ((seg = next_segment(len, offset)) != 0) {
 674                 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
 675                 if (ret < 0)
 676                         return ret;
 677                 offset = 0;
 678                 len -= seg;
 679                 ++gfn;
 680         }
 681         return 0;
 682 }
 683 EXPORT_SYMBOL_GPL(kvm_clear_guest);
 684
 685 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
 686 {
 687         struct kvm_memory_slot *memslot;
 688
 689         gfn = unalias_gfn(kvm, gfn);
 690         memslot = __gfn_to_memslot(kvm, gfn);
 691         if (memslot && memslot->dirty_bitmap) {
 692                 unsigned long rel_gfn = gfn - memslot->base_gfn;
 693
 694                 /* avoid RMW */
 695                 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
 696                         set_bit(rel_gfn, memslot->dirty_bitmap);
 697         }
 698 }
 699
 700 /*
 701  * The vCPU has executed a HLT instruction with in-kernel mode enabled.
 702  */
 703 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
 704 {
 705         DECLARE_WAITQUEUE(wait, current);
 706
 707         add_wait_queue(&vcpu->wq, &wait);
 708
 709         /*
 710          * We will block until either an interrupt or a signal wakes us up
 711          */
 712         while (!kvm_cpu_has_interrupt(vcpu)
 713                && !signal_pending(current)
 714                && vcpu->mp_state != VCPU_MP_STATE_RUNNABLE
 715                && vcpu->mp_state != VCPU_MP_STATE_SIPI_RECEIVED) {
 716                 set_current_state(TASK_INTERRUPTIBLE);
 717                 vcpu_put(vcpu);
 718                 schedule();
 719                 vcpu_load(vcpu);
 720         }
 721
 722         __set_current_state(TASK_RUNNING);
 723         remove_wait_queue(&vcpu->wq, &wait);
 724 }
 725
 726 void kvm_resched(struct kvm_vcpu *vcpu)
 727 {
 728         if (!need_resched())
 729                 return;
 730         cond_resched();
 731 }
 732 EXPORT_SYMBOL_GPL(kvm_resched);
 733
 734 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
 735                                     struct kvm_interrupt *irq)
 736 {
 737         if (irq->irq < 0 || irq->irq >= 256)
 738                 return -EINVAL;
 739         if (irqchip_in_kernel(vcpu->kvm))
 740                 return -ENXIO;
 741         vcpu_load(vcpu);
 742
 743         set_bit(irq->irq, vcpu->irq_pending);
 744         set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
 745
 746         vcpu_put(vcpu);
 747
 748         return 0;
 749 }
 750
 751 static struct page *kvm_vcpu_nopage(struct vm_area_struct *vma,
 752                                     unsigned long address,
 753                                     int *type)
 754 {
 755         struct kvm_vcpu *vcpu = vma->vm_file->private_data;
 756         unsigned long pgoff;
 757         struct page *page;
 758
 759         pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
 760         if (pgoff == 0)
 761                 page = virt_to_page(vcpu->run);
 762         else if (pgoff == KVM_PIO_PAGE_OFFSET)
 763                 page = virt_to_page(vcpu->pio_data);
 764         else
 765                 return NOPAGE_SIGBUS;
 766         get_page(page);
 767         if (type != NULL)
 768                 *type = VM_FAULT_MINOR;
 769
 770         return page;
 771 }
 772
 773 static struct vm_operations_struct kvm_vcpu_vm_ops = {
 774         .nopage = kvm_vcpu_nopage,
 775 };
 776
 777 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
 778 {
 779         vma->vm_ops = &kvm_vcpu_vm_ops;
 780         return 0;
 781 }
 782
 783 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
 784 {
 785         struct kvm_vcpu *vcpu = filp->private_data;
 786
 787         fput(vcpu->kvm->filp);
 788         return 0;
 789 }
 790
 791 static struct file_operations kvm_vcpu_fops = {
 792         .release        = kvm_vcpu_release,
 793         .unlocked_ioctl = kvm_vcpu_ioctl,
 794         .compat_ioctl   = kvm_vcpu_ioctl,
 795         .mmap           = kvm_vcpu_mmap,
 796 };
 797
 798 /*
 799  * Allocates an inode for the vcpu.
 800  */
 801 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
 802 {
 803         int fd, r;
 804         struct inode *inode;
 805         struct file *file;
 806
 807         r = anon_inode_getfd(&fd, &inode, &file,
 808                              "kvm-vcpu", &kvm_vcpu_fops, vcpu);
 809         if (r)
 810                 return r;
 811         atomic_inc(&vcpu->kvm->filp->f_count);
 812         return fd;
 813 }
 814
 815 /*
 816  * Creates some virtual cpus.  Good luck creating more than one.
 817  */
 818 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
 819 {
 820         int r;
 821         struct kvm_vcpu *vcpu;
 822
 823         if (!valid_vcpu(n))
 824                 return -EINVAL;
 825
 826         vcpu = kvm_arch_vcpu_create(kvm, n);
 827         if (IS_ERR(vcpu))
 828                 return PTR_ERR(vcpu);
 829
 830         preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
 831
 832         mutex_lock(&kvm->lock);
 833         if (kvm->vcpus[n]) {
 834                 r = -EEXIST;
 835                 mutex_unlock(&kvm->lock);
 836                 goto vcpu_destroy;
 837         }
 838         kvm->vcpus[n] = vcpu;
 839         mutex_unlock(&kvm->lock);
 840
 841         /* Now it's all set up, let userspace reach it */
 842         r = create_vcpu_fd(vcpu);
 843         if (r < 0)
 844                 goto unlink;
 845         return r;
 846
 847 unlink:
 848         mutex_lock(&kvm->lock);
 849         kvm->vcpus[n] = NULL;
 850         mutex_unlock(&kvm->lock);
 851 vcpu_destroy:
 852         kvm_arch_vcpu_destory(vcpu);
 853         return r;
 854 }
 855
 856 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
 857 {
 858         if (sigset) {
 859                 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
 860                 vcpu->sigset_active = 1;
 861                 vcpu->sigset = *sigset;
 862         } else
 863                 vcpu->sigset_active = 0;
 864         return 0;
 865 }
 866
 867 static long kvm_vcpu_ioctl(struct file *filp,
 868                            unsigned int ioctl, unsigned long arg)
 869 {
 870         struct kvm_vcpu *vcpu = filp->private_data;
 871         void __user *argp = (void __user *)arg;
 872         int r;
 873
 874         switch (ioctl) {
 875         case KVM_RUN:
 876                 r = -EINVAL;
 877                 if (arg)
 878                         goto out;
 879                 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
 880                 break;
 881         case KVM_GET_REGS: {
 882                 struct kvm_regs kvm_regs;
 883
 884                 memset(&kvm_regs, 0, sizeof kvm_regs);
 885                 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, &kvm_regs);
 886                 if (r)
 887                         goto out;
 888                 r = -EFAULT;
 889                 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
 890                         goto out;
 891                 r = 0;
 892                 break;
 893         }
 894         case KVM_SET_REGS: {
 895                 struct kvm_regs kvm_regs;
 896
 897                 r = -EFAULT;
 898                 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
 899                         goto out;
 900                 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, &kvm_regs);
 901                 if (r)
 902                         goto out;
 903                 r = 0;
 904                 break;
 905         }
 906         case KVM_GET_SREGS: {
 907                 struct kvm_sregs kvm_sregs;
 908
 909                 memset(&kvm_sregs, 0, sizeof kvm_sregs);
 910                 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs);
 911                 if (r)
 912                         goto out;
 913                 r = -EFAULT;
 914                 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
 915                         goto out;
 916                 r = 0;
 917                 break;
 918         }
 919         case KVM_SET_SREGS: {
 920                 struct kvm_sregs kvm_sregs;
 921
 922                 r = -EFAULT;
 923                 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
 924                         goto out;
 925                 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs);
 926                 if (r)
 927                         goto out;
 928                 r = 0;
 929                 break;
 930         }
 931         case KVM_TRANSLATE: {
 932                 struct kvm_translation tr;
 933
 934                 r = -EFAULT;
 935                 if (copy_from_user(&tr, argp, sizeof tr))
 936                         goto out;
 937                 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
 938                 if (r)
 939                         goto out;
 940                 r = -EFAULT;
 941                 if (copy_to_user(argp, &tr, sizeof tr))
 942                         goto out;
 943                 r = 0;
 944                 break;
 945         }
 946         case KVM_INTERRUPT: {
 947                 struct kvm_interrupt irq;
 948
 949                 r = -EFAULT;
 950                 if (copy_from_user(&irq, argp, sizeof irq))
 951                         goto out;
 952                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
 953                 if (r)
 954                         goto out;
 955                 r = 0;
 956                 break;
 957         }
 958         case KVM_DEBUG_GUEST: {
 959                 struct kvm_debug_guest dbg;
 960
 961                 r = -EFAULT;
 962                 if (copy_from_user(&dbg, argp, sizeof dbg))
 963                         goto out;
 964                 r = kvm_arch_vcpu_ioctl_debug_guest(vcpu, &dbg);
 965                 if (r)
 966                         goto out;
 967                 r = 0;
 968                 break;
 969         }
 970         case KVM_SET_SIGNAL_MASK: {
 971                 struct kvm_signal_mask __user *sigmask_arg = argp;
 972                 struct kvm_signal_mask kvm_sigmask;
 973                 sigset_t sigset, *p;
 974
 975                 p = NULL;
 976                 if (argp) {
 977                         r = -EFAULT;
 978                         if (copy_from_user(&kvm_sigmask, argp,
 979                                            sizeof kvm_sigmask))
 980                                 goto out;
 981                         r = -EINVAL;
 982                         if (kvm_sigmask.len != sizeof sigset)
 983                                 goto out;
 984                         r = -EFAULT;
 985                         if (copy_from_user(&sigset, sigmask_arg->sigset,
 986                                            sizeof sigset))
 987                                 goto out;
 988                         p = &sigset;
 989                 }
 990                 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
 991                 break;
 992         }
 993         case KVM_GET_FPU: {
 994                 struct kvm_fpu fpu;
 995
 996                 memset(&fpu, 0, sizeof fpu);
 997                 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, &fpu);
 998                 if (r)
 999                         goto out;
1000                 r = -EFAULT;
1001                 if (copy_to_user(argp, &fpu, sizeof fpu))
1002                         goto out;
1003                 r = 0;
1004                 break;
1005         }
1006         case KVM_SET_FPU: {
1007                 struct kvm_fpu fpu;
1008
1009                 r = -EFAULT;
1010                 if (copy_from_user(&fpu, argp, sizeof fpu))
1011                         goto out;
1012                 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, &fpu);
1013                 if (r)
1014                         goto out;
1015                 r = 0;
1016                 break;
1017         }
1018         default:
1019                 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1020         }
1021 out:
1022         return r;
1023 }
1024
1025 static long kvm_vm_ioctl(struct file *filp,
1026                            unsigned int ioctl, unsigned long arg)
1027 {
1028         struct kvm *kvm = filp->private_data;
1029         void __user *argp = (void __user *)arg;
1030         int r;
1031
1032         switch (ioctl) {
1033         case KVM_CREATE_VCPU:
1034                 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
1035                 if (r < 0)
1036                         goto out;
1037                 break;
1038         case KVM_SET_USER_MEMORY_REGION: {
1039                 struct kvm_userspace_memory_region kvm_userspace_mem;
1040
1041                 r = -EFAULT;
1042                 if (copy_from_user(&kvm_userspace_mem, argp,
1043                                                 sizeof kvm_userspace_mem))
1044                         goto out;
1045
1046                 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
1047                 if (r)
1048                         goto out;
1049                 break;
1050         }
1051         case KVM_GET_DIRTY_LOG: {
1052                 struct kvm_dirty_log log;
1053
1054                 r = -EFAULT;
1055                 if (copy_from_user(&log, argp, sizeof log))
1056                         goto out;
1057                 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
1058                 if (r)
1059                         goto out;
1060                 break;
1061         }
1062         default:
1063                 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
1064         }
1065 out:
1066         return r;
1067 }
1068
1069 static struct page *kvm_vm_nopage(struct vm_area_struct *vma,
1070                                   unsigned long address,
1071                                   int *type)
1072 {
1073         struct kvm *kvm = vma->vm_file->private_data;
1074         unsigned long pgoff;
1075         struct page *page;
1076
1077         pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
1078         if (!kvm_is_visible_gfn(kvm, pgoff))
1079                 return NOPAGE_SIGBUS;
1080         /* current->mm->mmap_sem is already held so call lockless version */
1081         page = __gfn_to_page(kvm, pgoff);
1082         if (is_error_page(page)) {
1083                 kvm_release_page(page);
1084                 return NOPAGE_SIGBUS;
1085         }
1086         if (type != NULL)
1087                 *type = VM_FAULT_MINOR;
1088
1089         return page;
1090 }
1091
1092 static struct vm_operations_struct kvm_vm_vm_ops = {
1093         .nopage = kvm_vm_nopage,
1094 };
1095
1096 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
1097 {
1098         vma->vm_ops = &kvm_vm_vm_ops;
1099         return 0;
1100 }
1101
1102 static struct file_operations kvm_vm_fops = {
1103         .release        = kvm_vm_release,
1104         .unlocked_ioctl = kvm_vm_ioctl,
1105         .compat_ioctl   = kvm_vm_ioctl,
1106         .mmap           = kvm_vm_mmap,
1107 };
1108
1109 static int kvm_dev_ioctl_create_vm(void)
1110 {
1111         int fd, r;
1112         struct inode *inode;
1113         struct file *file;
1114         struct kvm *kvm;
1115
1116         kvm = kvm_create_vm();
1117         if (IS_ERR(kvm))
1118                 return PTR_ERR(kvm);
1119         r = anon_inode_getfd(&fd, &inode, &file, "kvm-vm", &kvm_vm_fops, kvm);
1120         if (r) {
1121                 kvm_destroy_vm(kvm);
1122                 return r;
1123         }
1124
1125         kvm->filp = file;
1126
1127         return fd;
1128 }
1129
1130 static long kvm_dev_ioctl(struct file *filp,
1131                           unsigned int ioctl, unsigned long arg)
1132 {
1133         void __user *argp = (void __user *)arg;
1134         long r = -EINVAL;
1135
1136         switch (ioctl) {
1137         case KVM_GET_API_VERSION:
1138                 r = -EINVAL;
1139                 if (arg)
1140                         goto out;
1141                 r = KVM_API_VERSION;
1142                 break;
1143         case KVM_CREATE_VM:
1144                 r = -EINVAL;
1145                 if (arg)
1146                         goto out;
1147                 r = kvm_dev_ioctl_create_vm();
1148                 break;
1149         case KVM_CHECK_EXTENSION:
1150                 r = kvm_dev_ioctl_check_extension((long)argp);
1151                 break;
1152         case KVM_GET_VCPU_MMAP_SIZE:
1153                 r = -EINVAL;
1154                 if (arg)
1155                         goto out;
1156                 r = 2 * PAGE_SIZE;
1157                 break;
1158         default:
1159                 return kvm_arch_dev_ioctl(filp, ioctl, arg);
1160         }
1161 out:
1162         return r;
1163 }
1164
1165 static struct file_operations kvm_chardev_ops = {
1166         .unlocked_ioctl = kvm_dev_ioctl,
1167         .compat_ioctl   = kvm_dev_ioctl,
1168 };
1169
1170 static struct miscdevice kvm_dev = {
1171         KVM_MINOR,
1172         "kvm",
1173         &kvm_chardev_ops,
1174 };
1175
1176 static void hardware_enable(void *junk)
1177 {
1178         int cpu = raw_smp_processor_id();
1179
1180         if (cpu_isset(cpu, cpus_hardware_enabled))
1181                 return;
1182         cpu_set(cpu, cpus_hardware_enabled);
1183         kvm_arch_hardware_enable(NULL);
1184 }
1185
1186 static void hardware_disable(void *junk)
1187 {
1188         int cpu = raw_smp_processor_id();
1189
1190         if (!cpu_isset(cpu, cpus_hardware_enabled))
1191                 return;
1192         cpu_clear(cpu, cpus_hardware_enabled);
1193         decache_vcpus_on_cpu(cpu);
1194         kvm_arch_hardware_disable(NULL);
1195 }
1196
1197 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
1198                            void *v)
1199 {
1200         int cpu = (long)v;
1201
1202         val &= ~CPU_TASKS_FROZEN;
1203         switch (val) {
1204         case CPU_DYING:
1205                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
1206                        cpu);
1207                 hardware_disable(NULL);
1208                 break;
1209         case CPU_UP_CANCELED:
1210                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
1211                        cpu);
1212                 smp_call_function_single(cpu, hardware_disable, NULL, 0, 1);
1213                 break;
1214         case CPU_ONLINE:
1215                 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
1216                        cpu);
1217                 smp_call_function_single(cpu, hardware_enable, NULL, 0, 1);
1218                 break;
1219         }
1220         return NOTIFY_OK;
1221 }
1222
1223 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
1224                       void *v)
1225 {
1226         if (val == SYS_RESTART) {
1227                 /*
1228                  * Some (well, at least mine) BIOSes hang on reboot if
1229                  * in vmx root mode.
1230                  */
1231                 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
1232                 on_each_cpu(hardware_disable, NULL, 0, 1);
1233         }
1234         return NOTIFY_OK;
1235 }
1236
1237 static struct notifier_block kvm_reboot_notifier = {
1238         .notifier_call = kvm_reboot,
1239         .priority = 0,
1240 };
1241
1242 void kvm_io_bus_init(struct kvm_io_bus *bus)
1243 {
1244         memset(bus, 0, sizeof(*bus));
1245 }
1246
1247 void kvm_io_bus_destroy(struct kvm_io_bus *bus)
1248 {
1249         int i;
1250
1251         for (i = 0; i < bus->dev_count; i++) {
1252                 struct kvm_io_device *pos = bus->devs[i];
1253
1254                 kvm_iodevice_destructor(pos);
1255         }
1256 }
1257
1258 struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr)
1259 {
1260         int i;
1261
1262         for (i = 0; i < bus->dev_count; i++) {
1263                 struct kvm_io_device *pos = bus->devs[i];
1264
1265                 if (pos->in_range(pos, addr))
1266                         return pos;
1267         }
1268
1269         return NULL;
1270 }
1271
1272 void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev)
1273 {
1274         BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1));
1275
1276         bus->devs[bus->dev_count++] = dev;
1277 }
1278
1279 static struct notifier_block kvm_cpu_notifier = {
1280         .notifier_call = kvm_cpu_hotplug,
1281         .priority = 20, /* must be > scheduler priority */
1282 };
1283
1284 static u64 vm_stat_get(void *_offset)
1285 {
1286         unsigned offset = (long)_offset;
1287         u64 total = 0;
1288         struct kvm *kvm;
1289
1290         spin_lock(&kvm_lock);
1291         list_for_each_entry(kvm, &vm_list, vm_list)
1292                 total += *(u32 *)((void *)kvm + offset);
1293         spin_unlock(&kvm_lock);
1294         return total;
1295 }
1296
1297 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
1298
1299 static u64 vcpu_stat_get(void *_offset)
1300 {
1301         unsigned offset = (long)_offset;
1302         u64 total = 0;
1303         struct kvm *kvm;
1304         struct kvm_vcpu *vcpu;
1305         int i;
1306
1307         spin_lock(&kvm_lock);
1308         list_for_each_entry(kvm, &vm_list, vm_list)
1309                 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
1310                         vcpu = kvm->vcpus[i];
1311                         if (vcpu)
1312                                 total += *(u32 *)((void *)vcpu + offset);
1313                 }
1314         spin_unlock(&kvm_lock);
1315         return total;
1316 }
1317
1318 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
1319
1320 static struct file_operations *stat_fops[] = {
1321         [KVM_STAT_VCPU] = &vcpu_stat_fops,
1322         [KVM_STAT_VM]   = &vm_stat_fops,
1323 };
1324
1325 static void kvm_init_debug(void)
1326 {
1327         struct kvm_stats_debugfs_item *p;
1328
1329         debugfs_dir = debugfs_create_dir("kvm", NULL);
1330         for (p = debugfs_entries; p->name; ++p)
1331                 p->dentry = debugfs_create_file(p->name, 0444, debugfs_dir,
1332                                                 (void *)(long)p->offset,
1333                                                 stat_fops[p->kind]);
1334 }
1335
1336 static void kvm_exit_debug(void)
1337 {
1338         struct kvm_stats_debugfs_item *p;
1339
1340         for (p = debugfs_entries; p->name; ++p)
1341                 debugfs_remove(p->dentry);
1342         debugfs_remove(debugfs_dir);
1343 }
1344
1345 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
1346 {
1347         hardware_disable(NULL);
1348         return 0;
1349 }
1350
1351 static int kvm_resume(struct sys_device *dev)
1352 {
1353         hardware_enable(NULL);
1354         return 0;
1355 }
1356
1357 static struct sysdev_class kvm_sysdev_class = {
1358         .name = "kvm",
1359         .suspend = kvm_suspend,
1360         .resume = kvm_resume,
1361 };
1362
1363 static struct sys_device kvm_sysdev = {
1364         .id = 0,
1365         .cls = &kvm_sysdev_class,
1366 };
1367
1368 struct page *bad_page;
1369
1370 static inline
1371 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
1372 {
1373         return container_of(pn, struct kvm_vcpu, preempt_notifier);
1374 }
1375
1376 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
1377 {
1378         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
1379
1380         kvm_arch_vcpu_load(vcpu, cpu);
1381 }
1382
1383 static void kvm_sched_out(struct preempt_notifier *pn,
1384                           struct task_struct *next)
1385 {
1386         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
1387
1388         kvm_arch_vcpu_put(vcpu);
1389 }
1390
1391 int kvm_init(void *opaque, unsigned int vcpu_size,
1392                   struct module *module)
1393 {
1394         int r;
1395         int cpu;
1396
1397         r = kvm_mmu_module_init();
1398         if (r)
1399                 goto out4;
1400
1401         kvm_init_debug();
1402
1403         r = kvm_arch_init(opaque);
1404         if (r)
1405                 goto out4;
1406
1407         bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
1408
1409         if (bad_page == NULL) {
1410                 r = -ENOMEM;
1411                 goto out;
1412         }
1413
1414         r = kvm_arch_hardware_setup();
1415         if (r < 0)
1416                 goto out;
1417
1418         for_each_online_cpu(cpu) {
1419                 smp_call_function_single(cpu,
1420                                 kvm_arch_check_processor_compat,
1421                                 &r, 0, 1);
1422                 if (r < 0)
1423                         goto out_free_0;
1424         }
1425
1426         on_each_cpu(hardware_enable, NULL, 0, 1);
1427         r = register_cpu_notifier(&kvm_cpu_notifier);
1428         if (r)
1429                 goto out_free_1;
1430         register_reboot_notifier(&kvm_reboot_notifier);
1431
1432         r = sysdev_class_register(&kvm_sysdev_class);
1433         if (r)
1434                 goto out_free_2;
1435
1436         r = sysdev_register(&kvm_sysdev);
1437         if (r)
1438                 goto out_free_3;
1439
1440         /* A kmem cache lets us meet the alignment requirements of fx_save. */
1441         kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
1442                                            __alignof__(struct kvm_vcpu),
1443                                            0, NULL);
1444         if (!kvm_vcpu_cache) {
1445                 r = -ENOMEM;
1446                 goto out_free_4;
1447         }
1448
1449         kvm_chardev_ops.owner = module;
1450
1451         r = misc_register(&kvm_dev);
1452         if (r) {
1453                 printk(KERN_ERR "kvm: misc device register failed\n");
1454                 goto out_free;
1455         }
1456
1457         kvm_preempt_ops.sched_in = kvm_sched_in;
1458         kvm_preempt_ops.sched_out = kvm_sched_out;
1459
1460         kvm_mmu_set_nonpresent_ptes(0ull, 0ull);
1461
1462         return 0;
1463
1464 out_free:
1465         kmem_cache_destroy(kvm_vcpu_cache);
1466 out_free_4:
1467         sysdev_unregister(&kvm_sysdev);
1468 out_free_3:
1469         sysdev_class_unregister(&kvm_sysdev_class);
1470 out_free_2:
1471         unregister_reboot_notifier(&kvm_reboot_notifier);
1472         unregister_cpu_notifier(&kvm_cpu_notifier);
1473 out_free_1:
1474         on_each_cpu(hardware_disable, NULL, 0, 1);
1475 out_free_0:
1476         kvm_arch_hardware_unsetup();
1477 out:
1478         kvm_arch_exit();
1479         kvm_exit_debug();
1480         kvm_mmu_module_exit();
1481 out4:
1482         return r;
1483 }
1484 EXPORT_SYMBOL_GPL(kvm_init);
1485
1486 void kvm_exit(void)
1487 {
1488         misc_deregister(&kvm_dev);
1489         kmem_cache_destroy(kvm_vcpu_cache);
1490         sysdev_unregister(&kvm_sysdev);
1491         sysdev_class_unregister(&kvm_sysdev_class);
1492         unregister_reboot_notifier(&kvm_reboot_notifier);
1493         unregister_cpu_notifier(&kvm_cpu_notifier);
1494         on_each_cpu(hardware_disable, NULL, 0, 1);
1495         kvm_arch_hardware_unsetup();
1496         kvm_arch_exit();
1497         kvm_exit_debug();
1498         __free_page(bad_page);
1499         kvm_mmu_module_exit();
1500 }
1501 EXPORT_SYMBOL_GPL(kvm_exit);