virt/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   <[email protected]>
  11  *   Yaniv Kamay  <[email protected]>
  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 "iodev.h"
  19
  20 #include <linux/kvm_host.h>
  21 #include <linux/kvm.h>
  22 #include <linux/module.h>
  23 #include <linux/errno.h>
  24 #include <linux/percpu.h>
  25 #include <linux/gfp.h>
  26 #include <linux/mm.h>
  27 #include <linux/miscdevice.h>
  28 #include <linux/vmalloc.h>
  29 #include <linux/reboot.h>
  30 #include <linux/debugfs.h>
  31 #include <linux/highmem.h>
  32 #include <linux/file.h>
  33 #include <linux/sysdev.h>
  34 #include <linux/cpu.h>
  35 #include <linux/sched.h>
  36 #include <linux/cpumask.h>
  37 #include <linux/smp.h>
  38 #include <linux/anon_inodes.h>
  39 #include <linux/profile.h>
  40 #include <linux/kvm_para.h>
  41 #include <linux/pagemap.h>
  42 #include <linux/mman.h>
  43 #include <linux/swap.h>
  44
  45 #include <asm/processor.h>
  46 #include <asm/io.h>
  47 #include <asm/uaccess.h>
  48 #include <asm/pgtable.h>
  49
  50 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
  51 #include "coalesced_mmio.h"
  52 #endif
  53
  54 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
  55 #include <linux/pci.h>
  56 #include <linux/interrupt.h>
  57 #include "irq.h"
  58 #endif
  59
  60 MODULE_AUTHOR("Qumranet");
  61 MODULE_LICENSE("GPL");
  62
  63 DEFINE_SPINLOCK(kvm_lock);
  64 LIST_HEAD(vm_list);
  65
  66 static cpumask_t cpus_hardware_enabled;
  67
  68 struct kmem_cache *kvm_vcpu_cache;
  69 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
  70
  71 static __read_mostly struct preempt_ops kvm_preempt_ops;
  72
  73 struct dentry *kvm_debugfs_dir;
  74
  75 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
  76                            unsigned long arg);
  77
  78 bool kvm_rebooting;
  79
  80 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
  81 static struct kvm_assigned_dev_kernel *kvm_find_assigned_dev(struct list_head *head,
  82                                                       int assigned_dev_id)
  83 {
  84         struct list_head *ptr;
  85         struct kvm_assigned_dev_kernel *match;
  86
  87         list_for_each(ptr, head) {
  88                 match = list_entry(ptr, struct kvm_assigned_dev_kernel, list);
  89                 if (match->assigned_dev_id == assigned_dev_id)
  90                         return match;
  91         }
  92         return NULL;
  93 }
  94
  95 static void kvm_assigned_dev_interrupt_work_handler(struct work_struct *work)
  96 {
  97         struct kvm_assigned_dev_kernel *assigned_dev;
  98
  99         assigned_dev = container_of(work, struct kvm_assigned_dev_kernel,
 100                                     interrupt_work);
 101
 102         /* This is taken to safely inject irq inside the guest. When
 103          * the interrupt injection (or the ioapic code) uses a
 104          * finer-grained lock, update this
 105          */
 106         mutex_lock(&assigned_dev->kvm->lock);
 107         kvm_set_irq(assigned_dev->kvm,
 108                     assigned_dev->irq_source_id,
 109                     assigned_dev->guest_irq, 1);
 110         mutex_unlock(&assigned_dev->kvm->lock);
 111         kvm_put_kvm(assigned_dev->kvm);
 112 }
 113
 114 static irqreturn_t kvm_assigned_dev_intr(int irq, void *dev_id)
 115 {
 116         struct kvm_assigned_dev_kernel *assigned_dev =
 117                 (struct kvm_assigned_dev_kernel *) dev_id;
 118
 119         kvm_get_kvm(assigned_dev->kvm);
 120         schedule_work(&assigned_dev->interrupt_work);
 121         disable_irq_nosync(irq);
 122         return IRQ_HANDLED;
 123 }
 124
 125 /* Ack the irq line for an assigned device */
 126 static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
 127 {
 128         struct kvm_assigned_dev_kernel *dev;
 129
 130         if (kian->gsi == -1)
 131                 return;
 132
 133         dev = container_of(kian, struct kvm_assigned_dev_kernel,
 134                            ack_notifier);
 135         kvm_set_irq(dev->kvm, dev->irq_source_id, dev->guest_irq, 0);
 136         enable_irq(dev->host_irq);
 137 }
 138
 139 static void kvm_free_assigned_device(struct kvm *kvm,
 140                                      struct kvm_assigned_dev_kernel
 141                                      *assigned_dev)
 142 {
 143         if (irqchip_in_kernel(kvm) && assigned_dev->irq_requested)
 144                 free_irq(assigned_dev->host_irq, (void *)assigned_dev);
 145
 146         kvm_unregister_irq_ack_notifier(kvm, &assigned_dev->ack_notifier);
 147         kvm_free_irq_source_id(kvm, assigned_dev->irq_source_id);
 148
 149         if (cancel_work_sync(&assigned_dev->interrupt_work))
 150                 /* We had pending work. That means we will have to take
 151                  * care of kvm_put_kvm.
 152                  */
 153                 kvm_put_kvm(kvm);
 154
 155         pci_release_regions(assigned_dev->dev);
 156         pci_disable_device(assigned_dev->dev);
 157         pci_dev_put(assigned_dev->dev);
 158
 159         list_del(&assigned_dev->list);
 160         kfree(assigned_dev);
 161 }
 162
 163 void kvm_free_all_assigned_devices(struct kvm *kvm)
 164 {
 165         struct list_head *ptr, *ptr2;
 166         struct kvm_assigned_dev_kernel *assigned_dev;
 167
 168         list_for_each_safe(ptr, ptr2, &kvm->arch.assigned_dev_head) {
 169                 assigned_dev = list_entry(ptr,
 170                                           struct kvm_assigned_dev_kernel,
 171                                           list);
 172
 173                 kvm_free_assigned_device(kvm, assigned_dev);
 174         }
 175 }
 176
 177 static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
 178                                    struct kvm_assigned_irq
 179                                    *assigned_irq)
 180 {
 181         int r = 0;
 182         struct kvm_assigned_dev_kernel *match;
 183
 184         mutex_lock(&kvm->lock);
 185
 186         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 187                                       assigned_irq->assigned_dev_id);
 188         if (!match) {
 189                 mutex_unlock(&kvm->lock);
 190                 return -EINVAL;
 191         }
 192
 193         if (match->irq_requested) {
 194                 match->guest_irq = assigned_irq->guest_irq;
 195                 match->ack_notifier.gsi = assigned_irq->guest_irq;
 196                 mutex_unlock(&kvm->lock);
 197                 return 0;
 198         }
 199
 200         INIT_WORK(&match->interrupt_work,
 201                   kvm_assigned_dev_interrupt_work_handler);
 202
 203         if (irqchip_in_kernel(kvm)) {
 204                 if (!capable(CAP_SYS_RAWIO)) {
 205                         r = -EPERM;
 206                         goto out_release;
 207                 }
 208
 209                 if (assigned_irq->host_irq)
 210                         match->host_irq = assigned_irq->host_irq;
 211                 else
 212                         match->host_irq = match->dev->irq;
 213                 match->guest_irq = assigned_irq->guest_irq;
 214                 match->ack_notifier.gsi = assigned_irq->guest_irq;
 215                 match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq;
 216                 kvm_register_irq_ack_notifier(kvm, &match->ack_notifier);
 217                 r = kvm_request_irq_source_id(kvm);
 218                 if (r < 0)
 219                         goto out_release;
 220                 else
 221                         match->irq_source_id = r;
 222
 223                 /* Even though this is PCI, we don't want to use shared
 224                  * interrupts. Sharing host devices with guest-assigned devices
 225                  * on the same interrupt line is not a happy situation: there
 226                  * are going to be long delays in accepting, acking, etc.
 227                  */
 228                 if (request_irq(match->host_irq, kvm_assigned_dev_intr, 0,
 229                                 "kvm_assigned_device", (void *)match)) {
 230                         r = -EIO;
 231                         goto out_release;
 232                 }
 233         }
 234
 235         match->irq_requested = true;
 236         mutex_unlock(&kvm->lock);
 237         return r;
 238 out_release:
 239         mutex_unlock(&kvm->lock);
 240         kvm_free_assigned_device(kvm, match);
 241         return r;
 242 }
 243
 244 static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
 245                                       struct kvm_assigned_pci_dev *assigned_dev)
 246 {
 247         int r = 0;
 248         struct kvm_assigned_dev_kernel *match;
 249         struct pci_dev *dev;
 250
 251         mutex_lock(&kvm->lock);
 252
 253         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
 254                                       assigned_dev->assigned_dev_id);
 255         if (match) {
 256                 /* device already assigned */
 257                 r = -EINVAL;
 258                 goto out;
 259         }
 260
 261         match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL);
 262         if (match == NULL) {
 263                 printk(KERN_INFO "%s: Couldn't allocate memory\n",
 264                        __func__);
 265                 r = -ENOMEM;
 266                 goto out;
 267         }
 268         dev = pci_get_bus_and_slot(assigned_dev->busnr,
 269                                    assigned_dev->devfn);
 270         if (!dev) {
 271                 printk(KERN_INFO "%s: host device not found\n", __func__);
 272                 r = -EINVAL;
 273                 goto out_free;
 274         }
 275         if (pci_enable_device(dev)) {
 276                 printk(KERN_INFO "%s: Could not enable PCI device\n", __func__);
 277                 r = -EBUSY;
 278                 goto out_put;
 279         }
 280         r = pci_request_regions(dev, "kvm_assigned_device");
 281         if (r) {
 282                 printk(KERN_INFO "%s: Could not get access to device regions\n",
 283                        __func__);
 284                 goto out_disable;
 285         }
 286         match->assigned_dev_id = assigned_dev->assigned_dev_id;
 287         match->host_busnr = assigned_dev->busnr;
 288         match->host_devfn = assigned_dev->devfn;
 289         match->dev = dev;
 290
 291         match->kvm = kvm;
 292
 293         list_add(&match->list, &kvm->arch.assigned_dev_head);
 294
 295         if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU) {
 296                 r = kvm_iommu_map_guest(kvm, match);
 297                 if (r)
 298                         goto out_list_del;
 299         }
 300
 301 out:
 302         mutex_unlock(&kvm->lock);
 303         return r;
 304 out_list_del:
 305         list_del(&match->list);
 306         pci_release_regions(dev);
 307 out_disable:
 308         pci_disable_device(dev);
 309 out_put:
 310         pci_dev_put(dev);
 311 out_free:
 312         kfree(match);
 313         mutex_unlock(&kvm->lock);
 314         return r;
 315 }
 316 #endif
 317
 318 static inline int valid_vcpu(int n)
 319 {
 320         return likely(n >= 0 && n < KVM_MAX_VCPUS);
 321 }
 322
 323 inline int kvm_is_mmio_pfn(pfn_t pfn)
 324 {
 325         if (pfn_valid(pfn))
 326                 return PageReserved(pfn_to_page(pfn));
 327
 328         return true;
 329 }
 330
 331 /*
 332  * Switches to specified vcpu, until a matching vcpu_put()
 333  */
 334 void vcpu_load(struct kvm_vcpu *vcpu)
 335 {
 336         int cpu;
 337
 338         mutex_lock(&vcpu->mutex);
 339         cpu = get_cpu();
 340         preempt_notifier_register(&vcpu->preempt_notifier);
 341         kvm_arch_vcpu_load(vcpu, cpu);
 342         put_cpu();
 343 }
 344
 345 void vcpu_put(struct kvm_vcpu *vcpu)
 346 {
 347         preempt_disable();
 348         kvm_arch_vcpu_put(vcpu);
 349         preempt_notifier_unregister(&vcpu->preempt_notifier);
 350         preempt_enable();
 351         mutex_unlock(&vcpu->mutex);
 352 }
 353
 354 static void ack_flush(void *_completed)
 355 {
 356 }
 357
 358 void kvm_flush_remote_tlbs(struct kvm *kvm)
 359 {
 360         int i, cpu, me;
 361         cpumask_t cpus;
 362         struct kvm_vcpu *vcpu;
 363
 364         me = get_cpu();
 365         cpus_clear(cpus);
 366         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 367                 vcpu = kvm->vcpus[i];
 368                 if (!vcpu)
 369                         continue;
 370                 if (test_and_set_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests))
 371                         continue;
 372                 cpu = vcpu->cpu;
 373                 if (cpu != -1 && cpu != me)
 374                         cpu_set(cpu, cpus);
 375         }
 376         if (cpus_empty(cpus))
 377                 goto out;
 378         ++kvm->stat.remote_tlb_flush;
 379         smp_call_function_mask(cpus, ack_flush, NULL, 1);
 380 out:
 381         put_cpu();
 382 }
 383
 384 void kvm_reload_remote_mmus(struct kvm *kvm)
 385 {
 386         int i, cpu, me;
 387         cpumask_t cpus;
 388         struct kvm_vcpu *vcpu;
 389
 390         me = get_cpu();
 391         cpus_clear(cpus);
 392         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
 393                 vcpu = kvm->vcpus[i];
 394                 if (!vcpu)
 395                         continue;
 396                 if (test_and_set_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests))
 397                         continue;
 398                 cpu = vcpu->cpu;
 399                 if (cpu != -1 && cpu != me)
 400                         cpu_set(cpu, cpus);
 401         }
 402         if (cpus_empty(cpus))
 403                 goto out;
 404         smp_call_function_mask(cpus, ack_flush, NULL, 1);
 405 out:
 406         put_cpu();
 407 }
 408
 409
 410 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
 411 {
 412         struct page *page;
 413         int r;
 414
 415         mutex_init(&vcpu->mutex);
 416         vcpu->cpu = -1;
 417         vcpu->kvm = kvm;
 418         vcpu->vcpu_id = id;
 419         init_waitqueue_head(&vcpu->wq);
 420
 421         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 422         if (!page) {
 423                 r = -ENOMEM;
 424                 goto fail;
 425         }
 426         vcpu->run = page_address(page);
 427
 428         r = kvm_arch_vcpu_init(vcpu);
 429         if (r < 0)
 430                 goto fail_free_run;
 431         return 0;
 432
 433 fail_free_run:
 434         free_page((unsigned long)vcpu->run);
 435 fail:
 436         return r;
 437 }
 438 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
 439
 440 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
 441 {
 442         kvm_arch_vcpu_uninit(vcpu);
 443         free_page((unsigned long)vcpu->run);
 444 }
 445 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
 446
 447 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
 448 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
 449 {
 450         return container_of(mn, struct kvm, mmu_notifier);
 451 }
 452
 453 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
 454                                              struct mm_struct *mm,
 455                                              unsigned long address)
 456 {
 457         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 458         int need_tlb_flush;
 459
 460         /*
 461          * When ->invalidate_page runs, the linux pte has been zapped
 462          * already but the page is still allocated until
 463          * ->invalidate_page returns. So if we increase the sequence
 464          * here the kvm page fault will notice if the spte can't be
 465          * established because the page is going to be freed. If
 466          * instead the kvm page fault establishes the spte before
 467          * ->invalidate_page runs, kvm_unmap_hva will release it
 468          * before returning.
 469          *
 470          * The sequence increase only need to be seen at spin_unlock
 471          * time, and not at spin_lock time.
 472          *
 473          * Increasing the sequence after the spin_unlock would be
 474          * unsafe because the kvm page fault could then establish the
 475          * pte after kvm_unmap_hva returned, without noticing the page
 476          * is going to be freed.
 477          */
 478         spin_lock(&kvm->mmu_lock);
 479         kvm->mmu_notifier_seq++;
 480         need_tlb_flush = kvm_unmap_hva(kvm, address);
 481         spin_unlock(&kvm->mmu_lock);
 482
 483         /* we've to flush the tlb before the pages can be freed */
 484         if (need_tlb_flush)
 485                 kvm_flush_remote_tlbs(kvm);
 486
 487 }
 488
 489 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
 490                                                     struct mm_struct *mm,
 491                                                     unsigned long start,
 492                                                     unsigned long end)
 493 {
 494         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 495         int need_tlb_flush = 0;
 496
 497         spin_lock(&kvm->mmu_lock);
 498         /*
 499          * The count increase must become visible at unlock time as no
 500          * spte can be established without taking the mmu_lock and
 501          * count is also read inside the mmu_lock critical section.
 502          */
 503         kvm->mmu_notifier_count++;
 504         for (; start < end; start += PAGE_SIZE)
 505                 need_tlb_flush |= kvm_unmap_hva(kvm, start);
 506         spin_unlock(&kvm->mmu_lock);
 507
 508         /* we've to flush the tlb before the pages can be freed */
 509         if (need_tlb_flush)
 510                 kvm_flush_remote_tlbs(kvm);
 511 }
 512
 513 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
 514                                                   struct mm_struct *mm,
 515                                                   unsigned long start,
 516                                                   unsigned long end)
 517 {
 518         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 519
 520         spin_lock(&kvm->mmu_lock);
 521         /*
 522          * This sequence increase will notify the kvm page fault that
 523          * the page that is going to be mapped in the spte could have
 524          * been freed.
 525          */
 526         kvm->mmu_notifier_seq++;
 527         /*
 528          * The above sequence increase must be visible before the
 529          * below count decrease but both values are read by the kvm
 530          * page fault under mmu_lock spinlock so we don't need to add
 531          * a smb_wmb() here in between the two.
 532          */
 533         kvm->mmu_notifier_count--;
 534         spin_unlock(&kvm->mmu_lock);
 535
 536         BUG_ON(kvm->mmu_notifier_count < 0);
 537 }
 538
 539 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
 540                                               struct mm_struct *mm,
 541                                               unsigned long address)
 542 {
 543         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 544         int young;
 545
 546         spin_lock(&kvm->mmu_lock);
 547         young = kvm_age_hva(kvm, address);
 548         spin_unlock(&kvm->mmu_lock);
 549
 550         if (young)
 551                 kvm_flush_remote_tlbs(kvm);
 552
 553         return young;
 554 }
 555
 556 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
 557         .invalidate_page        = kvm_mmu_notifier_invalidate_page,
 558         .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
 559         .invalidate_range_end   = kvm_mmu_notifier_invalidate_range_end,
 560         .clear_flush_young      = kvm_mmu_notifier_clear_flush_young,
 561 };
 562 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
 563
 564 static struct kvm *kvm_create_vm(void)
 565 {
 566         struct kvm *kvm = kvm_arch_create_vm();
 567 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
 568         struct page *page;
 569 #endif
 570
 571         if (IS_ERR(kvm))
 572                 goto out;
 573
 574 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
 575         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 576         if (!page) {
 577                 kfree(kvm);
 578                 return ERR_PTR(-ENOMEM);
 579         }
 580         kvm->coalesced_mmio_ring =
 581                         (struct kvm_coalesced_mmio_ring *)page_address(page);
 582 #endif
 583
 584 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
 585         {
 586                 int err;
 587                 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
 588                 err = mmu_notifier_register(&kvm->mmu_notifier, current->mm);
 589                 if (err) {
 590 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
 591                         put_page(page);
 592 #endif
 593                         kfree(kvm);
 594                         return ERR_PTR(err);
 595                 }
 596         }
 597 #endif
 598
 599         kvm->mm = current->mm;
 600         atomic_inc(&kvm->mm->mm_count);
 601         spin_lock_init(&kvm->mmu_lock);
 602         kvm_io_bus_init(&kvm->pio_bus);
 603         mutex_init(&kvm->lock);
 604         kvm_io_bus_init(&kvm->mmio_bus);
 605         init_rwsem(&kvm->slots_lock);
 606         atomic_set(&kvm->users_count, 1);
 607         spin_lock(&kvm_lock);
 608         list_add(&kvm->vm_list, &vm_list);
 609         spin_unlock(&kvm_lock);
 610 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
 611         kvm_coalesced_mmio_init(kvm);
 612 #endif
 613 out:
 614         return kvm;
 615 }
 616
 617 /*
 618  * Free any memory in @free but not in @dont.
 619  */
 620 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
 621                                   struct kvm_memory_slot *dont)
 622 {
 623         if (!dont || free->rmap != dont->rmap)
 624                 vfree(free->rmap);
 625
 626         if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
 627                 vfree(free->dirty_bitmap);
 628
 629         if (!dont || free->lpage_info != dont->lpage_info)
 630                 vfree(free->lpage_info);
 631
 632         free->npages = 0;
 633         free->dirty_bitmap = NULL;
 634         free->rmap = NULL;
 635         free->lpage_info = NULL;
 636 }
 637
 638 void kvm_free_physmem(struct kvm *kvm)
 639 {
 640         int i;
 641
 642         for (i = 0; i < kvm->nmemslots; ++i)
 643                 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
 644 }
 645
 646 static void kvm_destroy_vm(struct kvm *kvm)
 647 {
 648         struct mm_struct *mm = kvm->mm;
 649
 650         spin_lock(&kvm_lock);
 651         list_del(&kvm->vm_list);
 652         spin_unlock(&kvm_lock);
 653         kvm_io_bus_destroy(&kvm->pio_bus);
 654         kvm_io_bus_destroy(&kvm->mmio_bus);
 655 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
 656         if (kvm->coalesced_mmio_ring != NULL)
 657                 free_page((unsigned long)kvm->coalesced_mmio_ring);
 658 #endif
 659 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
 660         mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
 661 #endif
 662         kvm_arch_destroy_vm(kvm);
 663         mmdrop(mm);
 664 }
 665
 666 void kvm_get_kvm(struct kvm *kvm)
 667 {
 668         atomic_inc(&kvm->users_count);
 669 }
 670 EXPORT_SYMBOL_GPL(kvm_get_kvm);
 671
 672 void kvm_put_kvm(struct kvm *kvm)
 673 {
 674         if (atomic_dec_and_test(&kvm->users_count))
 675                 kvm_destroy_vm(kvm);
 676 }
 677 EXPORT_SYMBOL_GPL(kvm_put_kvm);
 678
 679
 680 static int kvm_vm_release(struct inode *inode, struct file *filp)
 681 {
 682         struct kvm *kvm = filp->private_data;
 683
 684         kvm_put_kvm(kvm);
 685         return 0;
 686 }
 687
 688 /*
 689  * Allocate some memory and give it an address in the guest physical address
 690  * space.
 691  *
 692  * Discontiguous memory is allowed, mostly for framebuffers.
 693  *
 694  * Must be called holding mmap_sem for write.
 695  */
 696 int __kvm_set_memory_region(struct kvm *kvm,
 697                             struct kvm_userspace_memory_region *mem,
 698                             int user_alloc)
 699 {
 700         int r;
 701         gfn_t base_gfn;
 702         unsigned long npages;
 703         unsigned long i;
 704         struct kvm_memory_slot *memslot;
 705         struct kvm_memory_slot old, new;
 706
 707         r = -EINVAL;
 708         /* General sanity checks */
 709         if (mem->memory_size & (PAGE_SIZE - 1))
 710                 goto out;
 711         if (mem->guest_phys_addr & (PAGE_SIZE - 1))
 712                 goto out;
 713         if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
 714                 goto out;
 715         if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
 716                 goto out;
 717
 718         memslot = &kvm->memslots[mem->slot];
 719         base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
 720         npages = mem->memory_size >> PAGE_SHIFT;
 721
 722         if (!npages)
 723                 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
 724
 725         new = old = *memslot;
 726
 727         new.base_gfn = base_gfn;
 728         new.npages = npages;
 729         new.flags = mem->flags;
 730
 731         /* Disallow changing a memory slot's size. */
 732         r = -EINVAL;
 733         if (npages && old.npages && npages != old.npages)
 734                 goto out_free;
 735
 736         /* Check for overlaps */
 737         r = -EEXIST;
 738         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
 739                 struct kvm_memory_slot *s = &kvm->memslots[i];
 740
 741                 if (s == memslot)
 742                         continue;
 743                 if (!((base_gfn + npages <= s->base_gfn) ||
 744                       (base_gfn >= s->base_gfn + s->npages)))
 745                         goto out_free;
 746         }
 747
 748         /* Free page dirty bitmap if unneeded */
 749         if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
 750                 new.dirty_bitmap = NULL;
 751
 752         r = -ENOMEM;
 753
 754         /* Allocate if a slot is being created */
 755 #ifndef CONFIG_S390
 756         if (npages && !new.rmap) {
 757                 new.rmap = vmalloc(npages * sizeof(struct page *));
 758
 759                 if (!new.rmap)
 760                         goto out_free;
 761
 762                 memset(new.rmap, 0, npages * sizeof(*new.rmap));
 763
 764                 new.user_alloc = user_alloc;
 765                 /*
 766                  * hva_to_rmmap() serialzies with the mmu_lock and to be
 767                  * safe it has to ignore memslots with !user_alloc &&
 768                  * !userspace_addr.
 769                  */
 770                 if (user_alloc)
 771                         new.userspace_addr = mem->userspace_addr;
 772                 else
 773                         new.userspace_addr = 0;
 774         }
 775         if (npages && !new.lpage_info) {
 776                 int largepages = npages / KVM_PAGES_PER_HPAGE;
 777                 if (npages % KVM_PAGES_PER_HPAGE)
 778                         largepages++;
 779                 if (base_gfn % KVM_PAGES_PER_HPAGE)
 780                         largepages++;
 781
 782                 new.lpage_info = vmalloc(largepages * sizeof(*new.lpage_info));
 783
 784                 if (!new.lpage_info)
 785                         goto out_free;
 786
 787                 memset(new.lpage_info, 0, largepages * sizeof(*new.lpage_info));
 788
 789                 if (base_gfn % KVM_PAGES_PER_HPAGE)
 790                         new.lpage_info[0].write_count = 1;
 791                 if ((base_gfn+npages) % KVM_PAGES_PER_HPAGE)
 792                         new.lpage_info[largepages-1].write_count = 1;
 793         }
 794
 795         /* Allocate page dirty bitmap if needed */
 796         if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
 797                 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
 798
 799                 new.dirty_bitmap = vmalloc(dirty_bytes);
 800                 if (!new.dirty_bitmap)
 801                         goto out_free;
 802                 memset(new.dirty_bitmap, 0, dirty_bytes);
 803         }
 804 #endif /* not defined CONFIG_S390 */
 805
 806         if (!npages)
 807                 kvm_arch_flush_shadow(kvm);
 808
 809         spin_lock(&kvm->mmu_lock);
 810         if (mem->slot >= kvm->nmemslots)
 811                 kvm->nmemslots = mem->slot + 1;
 812
 813         *memslot = new;
 814         spin_unlock(&kvm->mmu_lock);
 815
 816         r = kvm_arch_set_memory_region(kvm, mem, old, user_alloc);
 817         if (r) {
 818                 spin_lock(&kvm->mmu_lock);
 819                 *memslot = old;
 820                 spin_unlock(&kvm->mmu_lock);
 821                 goto out_free;
 822         }
 823
 824         kvm_free_physmem_slot(&old, &new);
 825 #ifdef CONFIG_DMAR
 826         /* map the pages in iommu page table */
 827         r = kvm_iommu_map_pages(kvm, base_gfn, npages);
 828         if (r)
 829                 goto out;
 830 #endif
 831         return 0;
 832
 833 out_free:
 834         kvm_free_physmem_slot(&new, &old);
 835 out:
 836         return r;
 837
 838 }
 839 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
 840
 841 int kvm_set_memory_region(struct kvm *kvm,
 842                           struct kvm_userspace_memory_region *mem,
 843                           int user_alloc)
 844 {
 845         int r;
 846
 847         down_write(&kvm->slots_lock);
 848         r = __kvm_set_memory_region(kvm, mem, user_alloc);
 849         up_write(&kvm->slots_lock);
 850         return r;
 851 }
 852 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
 853
 854 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
 855                                    struct
 856                                    kvm_userspace_memory_region *mem,
 857                                    int user_alloc)
 858 {
 859         if (mem->slot >= KVM_MEMORY_SLOTS)
 860                 return -EINVAL;
 861         return kvm_set_memory_region(kvm, mem, user_alloc);
 862 }
 863
 864 int kvm_get_dirty_log(struct kvm *kvm,
 865                         struct kvm_dirty_log *log, int *is_dirty)
 866 {
 867         struct kvm_memory_slot *memslot;
 868         int r, i;
 869         int n;
 870         unsigned long any = 0;
 871
 872         r = -EINVAL;
 873         if (log->slot >= KVM_MEMORY_SLOTS)
 874                 goto out;
 875
 876         memslot = &kvm->memslots[log->slot];
 877         r = -ENOENT;
 878         if (!memslot->dirty_bitmap)
 879                 goto out;
 880
 881         n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
 882
 883         for (i = 0; !any && i < n/sizeof(long); ++i)
 884                 any = memslot->dirty_bitmap[i];
 885
 886         r = -EFAULT;
 887         if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
 888                 goto out;
 889
 890         if (any)
 891                 *is_dirty = 1;
 892
 893         r = 0;
 894 out:
 895         return r;
 896 }
 897
 898 int is_error_page(struct page *page)
 899 {
 900         return page == bad_page;
 901 }
 902 EXPORT_SYMBOL_GPL(is_error_page);
 903
 904 int is_error_pfn(pfn_t pfn)
 905 {
 906         return pfn == bad_pfn;
 907 }
 908 EXPORT_SYMBOL_GPL(is_error_pfn);
 909
 910 static inline unsigned long bad_hva(void)
 911 {
 912         return PAGE_OFFSET;
 913 }
 914
 915 int kvm_is_error_hva(unsigned long addr)
 916 {
 917         return addr == bad_hva();
 918 }
 919 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
 920
 921 static struct kvm_memory_slot *__gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
 922 {
 923         int i;
 924
 925         for (i = 0; i < kvm->nmemslots; ++i) {
 926                 struct kvm_memory_slot *memslot = &kvm->memslots[i];
 927
 928                 if (gfn >= memslot->base_gfn
 929                     && gfn < memslot->base_gfn + memslot->npages)
 930                         return memslot;
 931         }
 932         return NULL;
 933 }
 934
 935 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
 936 {
 937         gfn = unalias_gfn(kvm, gfn);
 938         return __gfn_to_memslot(kvm, gfn);
 939 }
 940
 941 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
 942 {
 943         int i;
 944
 945         gfn = unalias_gfn(kvm, gfn);
 946         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
 947                 struct kvm_memory_slot *memslot = &kvm->memslots[i];
 948
 949                 if (gfn >= memslot->base_gfn
 950                     && gfn < memslot->base_gfn + memslot->npages)
 951                         return 1;
 952         }
 953         return 0;
 954 }
 955 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
 956
 957 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
 958 {
 959         struct kvm_memory_slot *slot;
 960
 961         gfn = unalias_gfn(kvm, gfn);
 962         slot = __gfn_to_memslot(kvm, gfn);
 963         if (!slot)
 964                 return bad_hva();
 965         return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE);
 966 }
 967 EXPORT_SYMBOL_GPL(gfn_to_hva);
 968
 969 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
 970 {
 971         struct page *page[1];
 972         unsigned long addr;
 973         int npages;
 974         pfn_t pfn;
 975
 976         might_sleep();
 977
 978         addr = gfn_to_hva(kvm, gfn);
 979         if (kvm_is_error_hva(addr)) {
 980                 get_page(bad_page);
 981                 return page_to_pfn(bad_page);
 982         }
 983
 984         npages = get_user_pages_fast(addr, 1, 1, page);
 985
 986         if (unlikely(npages != 1)) {
 987                 struct vm_area_struct *vma;
 988
 989                 down_read(&current->mm->mmap_sem);
 990                 vma = find_vma(current->mm, addr);
 991
 992                 if (vma == NULL || addr < vma->vm_start ||
 993                     !(vma->vm_flags & VM_PFNMAP)) {
 994                         up_read(&current->mm->mmap_sem);
 995                         get_page(bad_page);
 996                         return page_to_pfn(bad_page);
 997                 }
 998
 999                 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
1000                 up_read(&current->mm->mmap_sem);
1001                 BUG_ON(!kvm_is_mmio_pfn(pfn));
1002         } else
1003                 pfn = page_to_pfn(page[0]);
1004
1005         return pfn;
1006 }
1007
1008 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1009
1010 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1011 {
1012         pfn_t pfn;
1013
1014         pfn = gfn_to_pfn(kvm, gfn);
1015         if (!kvm_is_mmio_pfn(pfn))
1016                 return pfn_to_page(pfn);
1017
1018         WARN_ON(kvm_is_mmio_pfn(pfn));
1019
1020         get_page(bad_page);
1021         return bad_page;
1022 }
1023
1024 EXPORT_SYMBOL_GPL(gfn_to_page);
1025
1026 void kvm_release_page_clean(struct page *page)
1027 {
1028         kvm_release_pfn_clean(page_to_pfn(page));
1029 }
1030 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1031
1032 void kvm_release_pfn_clean(pfn_t pfn)
1033 {
1034         if (!kvm_is_mmio_pfn(pfn))
1035                 put_page(pfn_to_page(pfn));
1036 }
1037 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1038
1039 void kvm_release_page_dirty(struct page *page)
1040 {
1041         kvm_release_pfn_dirty(page_to_pfn(page));
1042 }
1043 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1044
1045 void kvm_release_pfn_dirty(pfn_t pfn)
1046 {
1047         kvm_set_pfn_dirty(pfn);
1048         kvm_release_pfn_clean(pfn);
1049 }
1050 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1051
1052 void kvm_set_page_dirty(struct page *page)
1053 {
1054         kvm_set_pfn_dirty(page_to_pfn(page));
1055 }
1056 EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
1057
1058 void kvm_set_pfn_dirty(pfn_t pfn)
1059 {
1060         if (!kvm_is_mmio_pfn(pfn)) {
1061                 struct page *page = pfn_to_page(pfn);
1062                 if (!PageReserved(page))
1063                         SetPageDirty(page);
1064         }
1065 }
1066 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1067
1068 void kvm_set_pfn_accessed(pfn_t pfn)
1069 {
1070         if (!kvm_is_mmio_pfn(pfn))
1071                 mark_page_accessed(pfn_to_page(pfn));
1072 }
1073 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1074
1075 void kvm_get_pfn(pfn_t pfn)
1076 {
1077         if (!kvm_is_mmio_pfn(pfn))
1078                 get_page(pfn_to_page(pfn));
1079 }
1080 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1081
1082 static int next_segment(unsigned long len, int offset)
1083 {
1084         if (len > PAGE_SIZE - offset)
1085                 return PAGE_SIZE - offset;
1086         else
1087                 return len;
1088 }
1089
1090 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1091                         int len)
1092 {
1093         int r;
1094         unsigned long addr;
1095
1096         addr = gfn_to_hva(kvm, gfn);
1097         if (kvm_is_error_hva(addr))
1098                 return -EFAULT;
1099         r = copy_from_user(data, (void __user *)addr + offset, len);
1100         if (r)
1101                 return -EFAULT;
1102         return 0;
1103 }
1104 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1105
1106 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1107 {
1108         gfn_t gfn = gpa >> PAGE_SHIFT;
1109         int seg;
1110         int offset = offset_in_page(gpa);
1111         int ret;
1112
1113         while ((seg = next_segment(len, offset)) != 0) {
1114                 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1115                 if (ret < 0)
1116                         return ret;
1117                 offset = 0;
1118                 len -= seg;
1119                 data += seg;
1120                 ++gfn;
1121         }
1122         return 0;
1123 }
1124 EXPORT_SYMBOL_GPL(kvm_read_guest);
1125
1126 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1127                           unsigned long len)
1128 {
1129         int r;
1130         unsigned long addr;
1131         gfn_t gfn = gpa >> PAGE_SHIFT;
1132         int offset = offset_in_page(gpa);
1133
1134         addr = gfn_to_hva(kvm, gfn);
1135         if (kvm_is_error_hva(addr))
1136                 return -EFAULT;
1137         pagefault_disable();
1138         r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1139         pagefault_enable();
1140         if (r)
1141                 return -EFAULT;
1142         return 0;
1143 }
1144 EXPORT_SYMBOL(kvm_read_guest_atomic);
1145
1146 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1147                          int offset, int len)
1148 {
1149         int r;
1150         unsigned long addr;
1151
1152         addr = gfn_to_hva(kvm, gfn);
1153         if (kvm_is_error_hva(addr))
1154                 return -EFAULT;
1155         r = copy_to_user((void __user *)addr + offset, data, len);
1156         if (r)
1157                 return -EFAULT;
1158         mark_page_dirty(kvm, gfn);
1159         return 0;
1160 }
1161 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1162
1163 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1164                     unsigned long len)
1165 {
1166         gfn_t gfn = gpa >> PAGE_SHIFT;
1167         int seg;
1168         int offset = offset_in_page(gpa);
1169         int ret;
1170
1171         while ((seg = next_segment(len, offset)) != 0) {
1172                 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1173                 if (ret < 0)
1174                         return ret;
1175                 offset = 0;
1176                 len -= seg;
1177                 data += seg;
1178                 ++gfn;
1179         }
1180         return 0;
1181 }
1182
1183 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1184 {
1185         return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len);
1186 }
1187 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1188
1189 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1190 {
1191         gfn_t gfn = gpa >> PAGE_SHIFT;
1192         int seg;
1193         int offset = offset_in_page(gpa);
1194         int ret;
1195
1196         while ((seg = next_segment(len, offset)) != 0) {
1197                 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1198                 if (ret < 0)
1199                         return ret;
1200                 offset = 0;
1201                 len -= seg;
1202                 ++gfn;
1203         }
1204         return 0;
1205 }
1206 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1207
1208 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1209 {
1210         struct kvm_memory_slot *memslot;
1211
1212         gfn = unalias_gfn(kvm, gfn);
1213         memslot = __gfn_to_memslot(kvm, gfn);
1214         if (memslot && memslot->dirty_bitmap) {
1215                 unsigned long rel_gfn = gfn - memslot->base_gfn;
1216
1217                 /* avoid RMW */
1218                 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
1219                         set_bit(rel_gfn, memslot->dirty_bitmap);
1220         }
1221 }
1222
1223 /*
1224  * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1225  */
1226 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1227 {
1228         DEFINE_WAIT(wait);
1229
1230         for (;;) {
1231                 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1232
1233                 if (kvm_cpu_has_interrupt(vcpu) ||
1234                     kvm_cpu_has_pending_timer(vcpu) ||
1235                     kvm_arch_vcpu_runnable(vcpu)) {
1236                         set_bit(KVM_REQ_UNHALT, &vcpu->requests);
1237                         break;
1238                 }
1239                 if (signal_pending(current))
1240                         break;
1241
1242                 vcpu_put(vcpu);
1243                 schedule();
1244                 vcpu_load(vcpu);
1245         }
1246
1247         finish_wait(&vcpu->wq, &wait);
1248 }
1249
1250 void kvm_resched(struct kvm_vcpu *vcpu)
1251 {
1252         if (!need_resched())
1253                 return;
1254         cond_resched();
1255 }
1256 EXPORT_SYMBOL_GPL(kvm_resched);
1257
1258 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1259 {
1260         struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1261         struct page *page;
1262
1263         if (vmf->pgoff == 0)
1264                 page = virt_to_page(vcpu->run);
1265 #ifdef CONFIG_X86
1266         else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
1267                 page = virt_to_page(vcpu->arch.pio_data);
1268 #endif
1269 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1270         else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1271                 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1272 #endif
1273         else
1274                 return VM_FAULT_SIGBUS;
1275         get_page(page);
1276         vmf->page = page;
1277         return 0;
1278 }
1279
1280 static struct vm_operations_struct kvm_vcpu_vm_ops = {
1281         .fault = kvm_vcpu_fault,
1282 };
1283
1284 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1285 {
1286         vma->vm_ops = &kvm_vcpu_vm_ops;
1287         return 0;
1288 }
1289
1290 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1291 {
1292         struct kvm_vcpu *vcpu = filp->private_data;
1293
1294         kvm_put_kvm(vcpu->kvm);
1295         return 0;
1296 }
1297
1298 static const struct file_operations kvm_vcpu_fops = {
1299         .release        = kvm_vcpu_release,
1300         .unlocked_ioctl = kvm_vcpu_ioctl,
1301         .compat_ioctl   = kvm_vcpu_ioctl,
1302         .mmap           = kvm_vcpu_mmap,
1303 };
1304
1305 /*
1306  * Allocates an inode for the vcpu.
1307  */
1308 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1309 {
1310         int fd = anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, 0);
1311         if (fd < 0)
1312                 kvm_put_kvm(vcpu->kvm);
1313         return fd;
1314 }
1315
1316 /*
1317  * Creates some virtual cpus.  Good luck creating more than one.
1318  */
1319 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
1320 {
1321         int r;
1322         struct kvm_vcpu *vcpu;
1323
1324         if (!valid_vcpu(n))
1325                 return -EINVAL;
1326
1327         vcpu = kvm_arch_vcpu_create(kvm, n);
1328         if (IS_ERR(vcpu))
1329                 return PTR_ERR(vcpu);
1330
1331         preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1332
1333         r = kvm_arch_vcpu_setup(vcpu);
1334         if (r)
1335                 return r;
1336
1337         mutex_lock(&kvm->lock);
1338         if (kvm->vcpus[n]) {
1339                 r = -EEXIST;
1340                 goto vcpu_destroy;
1341         }
1342         kvm->vcpus[n] = vcpu;
1343         mutex_unlock(&kvm->lock);
1344
1345         /* Now it's all set up, let userspace reach it */
1346         kvm_get_kvm(kvm);
1347         r = create_vcpu_fd(vcpu);
1348         if (r < 0)
1349                 goto unlink;
1350         return r;
1351
1352 unlink:
1353         mutex_lock(&kvm->lock);
1354         kvm->vcpus[n] = NULL;
1355 vcpu_destroy:
1356         mutex_unlock(&kvm->lock);
1357         kvm_arch_vcpu_destroy(vcpu);
1358         return r;
1359 }
1360
1361 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1362 {
1363         if (sigset) {
1364                 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1365                 vcpu->sigset_active = 1;
1366                 vcpu->sigset = *sigset;
1367         } else
1368                 vcpu->sigset_active = 0;
1369         return 0;
1370 }
1371
1372 static long kvm_vcpu_ioctl(struct file *filp,
1373                            unsigned int ioctl, unsigned long arg)
1374 {
1375         struct kvm_vcpu *vcpu = filp->private_data;
1376         void __user *argp = (void __user *)arg;
1377         int r;
1378         struct kvm_fpu *fpu = NULL;
1379         struct kvm_sregs *kvm_sregs = NULL;
1380
1381         if (vcpu->kvm->mm != current->mm)
1382                 return -EIO;
1383         switch (ioctl) {
1384         case KVM_RUN:
1385                 r = -EINVAL;
1386                 if (arg)
1387                         goto out;
1388                 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
1389                 break;
1390         case KVM_GET_REGS: {
1391                 struct kvm_regs *kvm_regs;
1392
1393                 r = -ENOMEM;
1394                 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1395                 if (!kvm_regs)
1396                         goto out;
1397                 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
1398                 if (r)
1399                         goto out_free1;
1400                 r = -EFAULT;
1401                 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1402                         goto out_free1;
1403                 r = 0;
1404 out_free1:
1405                 kfree(kvm_regs);
1406                 break;
1407         }
1408         case KVM_SET_REGS: {
1409                 struct kvm_regs *kvm_regs;
1410
1411                 r = -ENOMEM;
1412                 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1413                 if (!kvm_regs)
1414                         goto out;
1415                 r = -EFAULT;
1416                 if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs)))
1417                         goto out_free2;
1418                 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
1419                 if (r)
1420                         goto out_free2;
1421                 r = 0;
1422 out_free2:
1423                 kfree(kvm_regs);
1424                 break;
1425         }
1426         case KVM_GET_SREGS: {
1427                 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1428                 r = -ENOMEM;
1429                 if (!kvm_sregs)
1430                         goto out;
1431                 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
1432                 if (r)
1433                         goto out;
1434                 r = -EFAULT;
1435                 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
1436                         goto out;
1437                 r = 0;
1438                 break;
1439         }
1440         case KVM_SET_SREGS: {
1441                 kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1442                 r = -ENOMEM;
1443                 if (!kvm_sregs)
1444                         goto out;
1445                 r = -EFAULT;
1446                 if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs)))
1447                         goto out;
1448                 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
1449                 if (r)
1450                         goto out;
1451                 r = 0;
1452                 break;
1453         }
1454         case KVM_GET_MP_STATE: {
1455                 struct kvm_mp_state mp_state;
1456
1457                 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
1458                 if (r)
1459                         goto out;
1460                 r = -EFAULT;
1461                 if (copy_to_user(argp, &mp_state, sizeof mp_state))
1462                         goto out;
1463                 r = 0;
1464                 break;
1465         }
1466         case KVM_SET_MP_STATE: {
1467                 struct kvm_mp_state mp_state;
1468
1469                 r = -EFAULT;
1470                 if (copy_from_user(&mp_state, argp, sizeof mp_state))
1471                         goto out;
1472                 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
1473                 if (r)
1474                         goto out;
1475                 r = 0;
1476                 break;
1477         }
1478         case KVM_TRANSLATE: {
1479                 struct kvm_translation tr;
1480
1481                 r = -EFAULT;
1482                 if (copy_from_user(&tr, argp, sizeof tr))
1483                         goto out;
1484                 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
1485                 if (r)
1486                         goto out;
1487                 r = -EFAULT;
1488                 if (copy_to_user(argp, &tr, sizeof tr))
1489                         goto out;
1490                 r = 0;
1491                 break;
1492         }
1493         case KVM_DEBUG_GUEST: {
1494                 struct kvm_debug_guest dbg;
1495
1496                 r = -EFAULT;
1497                 if (copy_from_user(&dbg, argp, sizeof dbg))
1498                         goto out;
1499                 r = kvm_arch_vcpu_ioctl_debug_guest(vcpu, &dbg);
1500                 if (r)
1501                         goto out;
1502                 r = 0;
1503                 break;
1504         }
1505         case KVM_SET_SIGNAL_MASK: {
1506                 struct kvm_signal_mask __user *sigmask_arg = argp;
1507                 struct kvm_signal_mask kvm_sigmask;
1508                 sigset_t sigset, *p;
1509
1510                 p = NULL;
1511                 if (argp) {
1512                         r = -EFAULT;
1513                         if (copy_from_user(&kvm_sigmask, argp,
1514                                            sizeof kvm_sigmask))
1515                                 goto out;
1516                         r = -EINVAL;
1517                         if (kvm_sigmask.len != sizeof sigset)
1518                                 goto out;
1519                         r = -EFAULT;
1520                         if (copy_from_user(&sigset, sigmask_arg->sigset,
1521                                            sizeof sigset))
1522                                 goto out;
1523                         p = &sigset;
1524                 }
1525                 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
1526                 break;
1527         }
1528         case KVM_GET_FPU: {
1529                 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1530                 r = -ENOMEM;
1531                 if (!fpu)
1532                         goto out;
1533                 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
1534                 if (r)
1535                         goto out;
1536                 r = -EFAULT;
1537                 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
1538                         goto out;
1539                 r = 0;
1540                 break;
1541         }
1542         case KVM_SET_FPU: {
1543                 fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1544                 r = -ENOMEM;
1545                 if (!fpu)
1546                         goto out;
1547                 r = -EFAULT;
1548                 if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu)))
1549                         goto out;
1550                 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
1551                 if (r)
1552                         goto out;
1553                 r = 0;
1554                 break;
1555         }
1556         default:
1557                 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1558         }
1559 out:
1560         kfree(fpu);
1561         kfree(kvm_sregs);
1562         return r;
1563 }
1564
1565 static long kvm_vm_ioctl(struct file *filp,
1566                            unsigned int ioctl, unsigned long arg)
1567 {
1568         struct kvm *kvm = filp->private_data;
1569         void __user *argp = (void __user *)arg;
1570         int r;
1571
1572         if (kvm->mm != current->mm)
1573                 return -EIO;
1574         switch (ioctl) {
1575         case KVM_CREATE_VCPU:
1576                 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
1577                 if (r < 0)
1578                         goto out;
1579                 break;
1580         case KVM_SET_USER_MEMORY_REGION: {
1581                 struct kvm_userspace_memory_region kvm_userspace_mem;
1582
1583                 r = -EFAULT;
1584                 if (copy_from_user(&kvm_userspace_mem, argp,
1585                                                 sizeof kvm_userspace_mem))
1586                         goto out;
1587
1588                 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
1589                 if (r)
1590                         goto out;
1591                 break;
1592         }
1593         case KVM_GET_DIRTY_LOG: {
1594                 struct kvm_dirty_log log;
1595
1596                 r = -EFAULT;
1597                 if (copy_from_user(&log, argp, sizeof log))
1598                         goto out;
1599                 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
1600                 if (r)
1601                         goto out;
1602                 break;
1603         }
1604 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1605         case KVM_REGISTER_COALESCED_MMIO: {
1606                 struct kvm_coalesced_mmio_zone zone;
1607                 r = -EFAULT;
1608                 if (copy_from_user(&zone, argp, sizeof zone))
1609                         goto out;
1610                 r = -ENXIO;
1611                 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
1612                 if (r)
1613                         goto out;
1614                 r = 0;
1615                 break;
1616         }
1617         case KVM_UNREGISTER_COALESCED_MMIO: {
1618                 struct kvm_coalesced_mmio_zone zone;
1619                 r = -EFAULT;
1620                 if (copy_from_user(&zone, argp, sizeof zone))
1621                         goto out;
1622                 r = -ENXIO;
1623                 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
1624                 if (r)
1625                         goto out;
1626                 r = 0;
1627                 break;
1628         }
1629 #endif
1630 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
1631         case KVM_ASSIGN_PCI_DEVICE: {
1632                 struct kvm_assigned_pci_dev assigned_dev;
1633
1634                 r = -EFAULT;
1635                 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
1636                         goto out;
1637                 r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev);
1638                 if (r)
1639                         goto out;
1640                 break;
1641         }
1642         case KVM_ASSIGN_IRQ: {
1643                 struct kvm_assigned_irq assigned_irq;
1644
1645                 r = -EFAULT;
1646                 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
1647                         goto out;
1648                 r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq);
1649                 if (r)
1650                         goto out;
1651                 break;
1652         }
1653 #endif
1654         default:
1655                 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
1656         }
1657 out:
1658         return r;
1659 }
1660
1661 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1662 {
1663         struct page *page[1];
1664         unsigned long addr;
1665         int npages;
1666         gfn_t gfn = vmf->pgoff;
1667         struct kvm *kvm = vma->vm_file->private_data;
1668
1669         addr = gfn_to_hva(kvm, gfn);
1670         if (kvm_is_error_hva(addr))
1671                 return VM_FAULT_SIGBUS;
1672
1673         npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
1674                                 NULL);
1675         if (unlikely(npages != 1))
1676                 return VM_FAULT_SIGBUS;
1677
1678         vmf->page = page[0];
1679         return 0;
1680 }
1681
1682 static struct vm_operations_struct kvm_vm_vm_ops = {
1683         .fault = kvm_vm_fault,
1684 };
1685
1686 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
1687 {
1688         vma->vm_ops = &kvm_vm_vm_ops;
1689         return 0;
1690 }
1691
1692 static const struct file_operations kvm_vm_fops = {
1693         .release        = kvm_vm_release,
1694         .unlocked_ioctl = kvm_vm_ioctl,
1695         .compat_ioctl   = kvm_vm_ioctl,
1696         .mmap           = kvm_vm_mmap,
1697 };
1698
1699 static int kvm_dev_ioctl_create_vm(void)
1700 {
1701         int fd;
1702         struct kvm *kvm;
1703
1704         kvm = kvm_create_vm();
1705         if (IS_ERR(kvm))
1706                 return PTR_ERR(kvm);
1707         fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, 0);
1708         if (fd < 0)
1709                 kvm_put_kvm(kvm);
1710
1711         return fd;
1712 }
1713
1714 static long kvm_dev_ioctl(struct file *filp,
1715                           unsigned int ioctl, unsigned long arg)
1716 {
1717         long r = -EINVAL;
1718
1719         switch (ioctl) {
1720         case KVM_GET_API_VERSION:
1721                 r = -EINVAL;
1722                 if (arg)
1723                         goto out;
1724                 r = KVM_API_VERSION;
1725                 break;
1726         case KVM_CREATE_VM:
1727                 r = -EINVAL;
1728                 if (arg)
1729                         goto out;
1730                 r = kvm_dev_ioctl_create_vm();
1731                 break;
1732         case KVM_CHECK_EXTENSION:
1733                 r = kvm_dev_ioctl_check_extension(arg);
1734                 break;
1735         case KVM_GET_VCPU_MMAP_SIZE:
1736                 r = -EINVAL;
1737                 if (arg)
1738                         goto out;
1739                 r = PAGE_SIZE;     /* struct kvm_run */
1740 #ifdef CONFIG_X86
1741                 r += PAGE_SIZE;    /* pio data page */
1742 #endif
1743 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1744                 r += PAGE_SIZE;    /* coalesced mmio ring page */
1745 #endif
1746                 break;
1747         case KVM_TRACE_ENABLE:
1748         case KVM_TRACE_PAUSE:
1749         case KVM_TRACE_DISABLE:
1750                 r = kvm_trace_ioctl(ioctl, arg);
1751                 break;
1752         default:
1753                 return kvm_arch_dev_ioctl(filp, ioctl, arg);
1754         }
1755 out:
1756         return r;
1757 }
1758
1759 static struct file_operations kvm_chardev_ops = {
1760         .unlocked_ioctl = kvm_dev_ioctl,
1761         .compat_ioctl   = kvm_dev_ioctl,
1762 };
1763
1764 static struct miscdevice kvm_dev = {
1765         KVM_MINOR,
1766         "kvm",
1767         &kvm_chardev_ops,
1768 };
1769
1770 static void hardware_enable(void *junk)
1771 {
1772         int cpu = raw_smp_processor_id();
1773
1774         if (cpu_isset(cpu, cpus_hardware_enabled))
1775                 return;
1776         cpu_set(cpu, cpus_hardware_enabled);
1777         kvm_arch_hardware_enable(NULL);
1778 }
1779
1780 static void hardware_disable(void *junk)
1781 {
1782         int cpu = raw_smp_processor_id();
1783
1784         if (!cpu_isset(cpu, cpus_hardware_enabled))
1785                 return;
1786         cpu_clear(cpu, cpus_hardware_enabled);
1787         kvm_arch_hardware_disable(NULL);
1788 }
1789
1790 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
1791                            void *v)
1792 {
1793         int cpu = (long)v;
1794
1795         val &= ~CPU_TASKS_FROZEN;
1796         switch (val) {
1797         case CPU_DYING:
1798                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
1799                        cpu);
1800                 hardware_disable(NULL);
1801                 break;
1802         case CPU_UP_CANCELED:
1803                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
1804                        cpu);
1805                 smp_call_function_single(cpu, hardware_disable, NULL, 1);
1806                 break;
1807         case CPU_ONLINE:
1808                 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
1809                        cpu);
1810                 smp_call_function_single(cpu, hardware_enable, NULL, 1);
1811                 break;
1812         }
1813         return NOTIFY_OK;
1814 }
1815
1816
1817 asmlinkage void kvm_handle_fault_on_reboot(void)
1818 {
1819         if (kvm_rebooting)
1820                 /* spin while reset goes on */
1821                 while (true)
1822                         ;
1823         /* Fault while not rebooting.  We want the trace. */
1824         BUG();
1825 }
1826 EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot);
1827
1828 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
1829                       void *v)
1830 {
1831         if (val == SYS_RESTART) {
1832                 /*
1833                  * Some (well, at least mine) BIOSes hang on reboot if
1834                  * in vmx root mode.
1835                  */
1836                 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
1837                 kvm_rebooting = true;
1838                 on_each_cpu(hardware_disable, NULL, 1);
1839         }
1840         return NOTIFY_OK;
1841 }
1842
1843 static struct notifier_block kvm_reboot_notifier = {
1844         .notifier_call = kvm_reboot,
1845         .priority = 0,
1846 };
1847
1848 void kvm_io_bus_init(struct kvm_io_bus *bus)
1849 {
1850         memset(bus, 0, sizeof(*bus));
1851 }
1852
1853 void kvm_io_bus_destroy(struct kvm_io_bus *bus)
1854 {
1855         int i;
1856
1857         for (i = 0; i < bus->dev_count; i++) {
1858                 struct kvm_io_device *pos = bus->devs[i];
1859
1860                 kvm_iodevice_destructor(pos);
1861         }
1862 }
1863
1864 struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus,
1865                                           gpa_t addr, int len, int is_write)
1866 {
1867         int i;
1868
1869         for (i = 0; i < bus->dev_count; i++) {
1870                 struct kvm_io_device *pos = bus->devs[i];
1871
1872                 if (pos->in_range(pos, addr, len, is_write))
1873                         return pos;
1874         }
1875
1876         return NULL;
1877 }
1878
1879 void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev)
1880 {
1881         BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1));
1882
1883         bus->devs[bus->dev_count++] = dev;
1884 }
1885
1886 static struct notifier_block kvm_cpu_notifier = {
1887         .notifier_call = kvm_cpu_hotplug,
1888         .priority = 20, /* must be > scheduler priority */
1889 };
1890
1891 static int vm_stat_get(void *_offset, u64 *val)
1892 {
1893         unsigned offset = (long)_offset;
1894         struct kvm *kvm;
1895
1896         *val = 0;
1897         spin_lock(&kvm_lock);
1898         list_for_each_entry(kvm, &vm_list, vm_list)
1899                 *val += *(u32 *)((void *)kvm + offset);
1900         spin_unlock(&kvm_lock);
1901         return 0;
1902 }
1903
1904 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
1905
1906 static int vcpu_stat_get(void *_offset, u64 *val)
1907 {
1908         unsigned offset = (long)_offset;
1909         struct kvm *kvm;
1910         struct kvm_vcpu *vcpu;
1911         int i;
1912
1913         *val = 0;
1914         spin_lock(&kvm_lock);
1915         list_for_each_entry(kvm, &vm_list, vm_list)
1916                 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
1917                         vcpu = kvm->vcpus[i];
1918                         if (vcpu)
1919                                 *val += *(u32 *)((void *)vcpu + offset);
1920                 }
1921         spin_unlock(&kvm_lock);
1922         return 0;
1923 }
1924
1925 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
1926
1927 static struct file_operations *stat_fops[] = {
1928         [KVM_STAT_VCPU] = &vcpu_stat_fops,
1929         [KVM_STAT_VM]   = &vm_stat_fops,
1930 };
1931
1932 static void kvm_init_debug(void)
1933 {
1934         struct kvm_stats_debugfs_item *p;
1935
1936         kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
1937         for (p = debugfs_entries; p->name; ++p)
1938                 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
1939                                                 (void *)(long)p->offset,
1940                                                 stat_fops[p->kind]);
1941 }
1942
1943 static void kvm_exit_debug(void)
1944 {
1945         struct kvm_stats_debugfs_item *p;
1946
1947         for (p = debugfs_entries; p->name; ++p)
1948                 debugfs_remove(p->dentry);
1949         debugfs_remove(kvm_debugfs_dir);
1950 }
1951
1952 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
1953 {
1954         hardware_disable(NULL);
1955         return 0;
1956 }
1957
1958 static int kvm_resume(struct sys_device *dev)
1959 {
1960         hardware_enable(NULL);
1961         return 0;
1962 }
1963
1964 static struct sysdev_class kvm_sysdev_class = {
1965         .name = "kvm",
1966         .suspend = kvm_suspend,
1967         .resume = kvm_resume,
1968 };
1969
1970 static struct sys_device kvm_sysdev = {
1971         .id = 0,
1972         .cls = &kvm_sysdev_class,
1973 };
1974
1975 struct page *bad_page;
1976 pfn_t bad_pfn;
1977
1978 static inline
1979 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
1980 {
1981         return container_of(pn, struct kvm_vcpu, preempt_notifier);
1982 }
1983
1984 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
1985 {
1986         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
1987
1988         kvm_arch_vcpu_load(vcpu, cpu);
1989 }
1990
1991 static void kvm_sched_out(struct preempt_notifier *pn,
1992                           struct task_struct *next)
1993 {
1994         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
1995
1996         kvm_arch_vcpu_put(vcpu);
1997 }
1998
1999 int kvm_init(void *opaque, unsigned int vcpu_size,
2000                   struct module *module)
2001 {
2002         int r;
2003         int cpu;
2004
2005         kvm_init_debug();
2006
2007         r = kvm_arch_init(opaque);
2008         if (r)
2009                 goto out_fail;
2010
2011         bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2012
2013         if (bad_page == NULL) {
2014                 r = -ENOMEM;
2015                 goto out;
2016         }
2017
2018         bad_pfn = page_to_pfn(bad_page);
2019
2020         r = kvm_arch_hardware_setup();
2021         if (r < 0)
2022                 goto out_free_0;
2023
2024         for_each_online_cpu(cpu) {
2025                 smp_call_function_single(cpu,
2026                                 kvm_arch_check_processor_compat,
2027                                 &r, 1);
2028                 if (r < 0)
2029                         goto out_free_1;
2030         }
2031
2032         on_each_cpu(hardware_enable, NULL, 1);
2033         r = register_cpu_notifier(&kvm_cpu_notifier);
2034         if (r)
2035                 goto out_free_2;
2036         register_reboot_notifier(&kvm_reboot_notifier);
2037
2038         r = sysdev_class_register(&kvm_sysdev_class);
2039         if (r)
2040                 goto out_free_3;
2041
2042         r = sysdev_register(&kvm_sysdev);
2043         if (r)
2044                 goto out_free_4;
2045
2046         /* A kmem cache lets us meet the alignment requirements of fx_save. */
2047         kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
2048                                            __alignof__(struct kvm_vcpu),
2049                                            0, NULL);
2050         if (!kvm_vcpu_cache) {
2051                 r = -ENOMEM;
2052                 goto out_free_5;
2053         }
2054
2055         kvm_chardev_ops.owner = module;
2056
2057         r = misc_register(&kvm_dev);
2058         if (r) {
2059                 printk(KERN_ERR "kvm: misc device register failed\n");
2060                 goto out_free;
2061         }
2062
2063         kvm_preempt_ops.sched_in = kvm_sched_in;
2064         kvm_preempt_ops.sched_out = kvm_sched_out;
2065
2066         return 0;
2067
2068 out_free:
2069         kmem_cache_destroy(kvm_vcpu_cache);
2070 out_free_5:
2071         sysdev_unregister(&kvm_sysdev);
2072 out_free_4:
2073         sysdev_class_unregister(&kvm_sysdev_class);
2074 out_free_3:
2075         unregister_reboot_notifier(&kvm_reboot_notifier);
2076         unregister_cpu_notifier(&kvm_cpu_notifier);
2077 out_free_2:
2078         on_each_cpu(hardware_disable, NULL, 1);
2079 out_free_1:
2080         kvm_arch_hardware_unsetup();
2081 out_free_0:
2082         __free_page(bad_page);
2083 out:
2084         kvm_arch_exit();
2085         kvm_exit_debug();
2086 out_fail:
2087         return r;
2088 }
2089 EXPORT_SYMBOL_GPL(kvm_init);
2090
2091 void kvm_exit(void)
2092 {
2093         kvm_trace_cleanup();
2094         misc_deregister(&kvm_dev);
2095         kmem_cache_destroy(kvm_vcpu_cache);
2096         sysdev_unregister(&kvm_sysdev);
2097         sysdev_class_unregister(&kvm_sysdev_class);
2098         unregister_reboot_notifier(&kvm_reboot_notifier);
2099         unregister_cpu_notifier(&kvm_cpu_notifier);
2100         on_each_cpu(hardware_disable, NULL, 1);
2101         kvm_arch_hardware_unsetup();
2102         kvm_arch_exit();
2103         kvm_exit_debug();
2104         __free_page(bad_page);
2105 }
2106 EXPORT_SYMBOL_GPL(kvm_exit);