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  * Copyright 2010 Red Hat, Inc. and/or its affiliates.
   9  *
  10  * Authors:
  11  *   Avi Kivity   <avi@qumranet.com>
  12  *   Yaniv Kamay  <yaniv@qumranet.com>
  13  *
  14  * This work is licensed under the terms of the GNU GPL, version 2.  See
  15  * the COPYING file in the top-level directory.
  16  *
  17  */
  18
  19 #include "iodev.h"
  20
  21 #include <linux/kvm_host.h>
  22 #include <linux/kvm.h>
  23 #include <linux/module.h>
  24 #include <linux/errno.h>
  25 #include <linux/percpu.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/syscore_ops.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 #include <linux/bitops.h>
  45 #include <linux/spinlock.h>
  46 #include <linux/compat.h>
  47 #include <linux/srcu.h>
  48 #include <linux/hugetlb.h>
  49 #include <linux/slab.h>
  50 #include <linux/sort.h>
  51 #include <linux/bsearch.h>
  52
  53 #include <asm/processor.h>
  54 #include <asm/io.h>
  55 #include <asm/uaccess.h>
  56 #include <asm/pgtable.h>
  57
  58 #include "coalesced_mmio.h"
  59 #include "async_pf.h"
  60
  61 #define CREATE_TRACE_POINTS
  62 #include <trace/events/kvm.h>
  63
  64 MODULE_AUTHOR("Qumranet");
  65 MODULE_LICENSE("GPL");
  66
  67 /*
  68  * Ordering of locks:
  69  *
  70  *              kvm->lock --> kvm->slots_lock --> kvm->irq_lock
  71  */
  72
  73 DEFINE_RAW_SPINLOCK(kvm_lock);
  74 LIST_HEAD(vm_list);
  75
  76 static cpumask_var_t cpus_hardware_enabled;
  77 static int kvm_usage_count = 0;
  78 static atomic_t hardware_enable_failed;
  79
  80 struct kmem_cache *kvm_vcpu_cache;
  81 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
  82
  83 static __read_mostly struct preempt_ops kvm_preempt_ops;
  84
  85 struct dentry *kvm_debugfs_dir;
  86
  87 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
  88                            unsigned long arg);
  89 #ifdef CONFIG_COMPAT
  90 static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl,
  91                                   unsigned long arg);
  92 #endif
  93 static int hardware_enable_all(void);
  94 static void hardware_disable_all(void);
  95
  96 static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
  97
  98 bool kvm_rebooting;
  99 EXPORT_SYMBOL_GPL(kvm_rebooting);
 100
 101 static bool largepages_enabled = true;
 102
 103 static struct page *hwpoison_page;
 104 static pfn_t hwpoison_pfn;
 105
 106 struct page *fault_page;
 107 pfn_t fault_pfn;
 108
 109 inline int kvm_is_mmio_pfn(pfn_t pfn)
 110 {
 111         if (pfn_valid(pfn)) {
 112                 int reserved;
 113                 struct page *tail = pfn_to_page(pfn);
 114                 struct page *head = compound_trans_head(tail);
 115                 reserved = PageReserved(head);
 116                 if (head != tail) {
 117                         /*
 118                          * "head" is not a dangling pointer
 119                          * (compound_trans_head takes care of that)
 120                          * but the hugepage may have been splitted
 121                          * from under us (and we may not hold a
 122                          * reference count on the head page so it can
 123                          * be reused before we run PageReferenced), so
 124                          * we've to check PageTail before returning
 125                          * what we just read.
 126                          */
 127                         smp_rmb();
 128                         if (PageTail(tail))
 129                                 return reserved;
 130                 }
 131                 return PageReserved(tail);
 132         }
 133
 134         return true;
 135 }
 136
 137 /*
 138  * Switches to specified vcpu, until a matching vcpu_put()
 139  */
 140 void vcpu_load(struct kvm_vcpu *vcpu)
 141 {
 142         int cpu;
 143
 144         mutex_lock(&vcpu->mutex);
 145         if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) {
 146                 /* The thread running this VCPU changed. */
 147                 struct pid *oldpid = vcpu->pid;
 148                 struct pid *newpid = get_task_pid(current, PIDTYPE_PID);
 149                 rcu_assign_pointer(vcpu->pid, newpid);
 150                 synchronize_rcu();
 151                 put_pid(oldpid);
 152         }
 153         cpu = get_cpu();
 154         preempt_notifier_register(&vcpu->preempt_notifier);
 155         kvm_arch_vcpu_load(vcpu, cpu);
 156         put_cpu();
 157 }
 158
 159 void vcpu_put(struct kvm_vcpu *vcpu)
 160 {
 161         preempt_disable();
 162         kvm_arch_vcpu_put(vcpu);
 163         preempt_notifier_unregister(&vcpu->preempt_notifier);
 164         preempt_enable();
 165         mutex_unlock(&vcpu->mutex);
 166 }
 167
 168 static void ack_flush(void *_completed)
 169 {
 170 }
 171
 172 static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
 173 {
 174         int i, cpu, me;
 175         cpumask_var_t cpus;
 176         bool called = true;
 177         struct kvm_vcpu *vcpu;
 178
 179         zalloc_cpumask_var(&cpus, GFP_ATOMIC);
 180
 181         me = get_cpu();
 182         kvm_for_each_vcpu(i, vcpu, kvm) {
 183                 kvm_make_request(req, vcpu);
 184                 cpu = vcpu->cpu;
 185
 186                 /* Set ->requests bit before we read ->mode */
 187                 smp_mb();
 188
 189                 if (cpus != NULL && cpu != -1 && cpu != me &&
 190                       kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE)
 191                         cpumask_set_cpu(cpu, cpus);
 192         }
 193         if (unlikely(cpus == NULL))
 194                 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
 195         else if (!cpumask_empty(cpus))
 196                 smp_call_function_many(cpus, ack_flush, NULL, 1);
 197         else
 198                 called = false;
 199         put_cpu();
 200         free_cpumask_var(cpus);
 201         return called;
 202 }
 203
 204 void kvm_flush_remote_tlbs(struct kvm *kvm)
 205 {
 206         int dirty_count = kvm->tlbs_dirty;
 207
 208         smp_mb();
 209         if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
 210                 ++kvm->stat.remote_tlb_flush;
 211         cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
 212 }
 213
 214 void kvm_reload_remote_mmus(struct kvm *kvm)
 215 {
 216         make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
 217 }
 218
 219 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
 220 {
 221         struct page *page;
 222         int r;
 223
 224         mutex_init(&vcpu->mutex);
 225         vcpu->cpu = -1;
 226         vcpu->kvm = kvm;
 227         vcpu->vcpu_id = id;
 228         vcpu->pid = NULL;
 229         init_waitqueue_head(&vcpu->wq);
 230         kvm_async_pf_vcpu_init(vcpu);
 231
 232         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 233         if (!page) {
 234                 r = -ENOMEM;
 235                 goto fail;
 236         }
 237         vcpu->run = page_address(page);
 238
 239         r = kvm_arch_vcpu_init(vcpu);
 240         if (r < 0)
 241                 goto fail_free_run;
 242         return 0;
 243
 244 fail_free_run:
 245         free_page((unsigned long)vcpu->run);
 246 fail:
 247         return r;
 248 }
 249 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
 250
 251 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
 252 {
 253         put_pid(vcpu->pid);
 254         kvm_arch_vcpu_uninit(vcpu);
 255         free_page((unsigned long)vcpu->run);
 256 }
 257 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
 258
 259 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
 260 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
 261 {
 262         return container_of(mn, struct kvm, mmu_notifier);
 263 }
 264
 265 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
 266                                              struct mm_struct *mm,
 267                                              unsigned long address)
 268 {
 269         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 270         int need_tlb_flush, idx;
 271
 272         /*
 273          * When ->invalidate_page runs, the linux pte has been zapped
 274          * already but the page is still allocated until
 275          * ->invalidate_page returns. So if we increase the sequence
 276          * here the kvm page fault will notice if the spte can't be
 277          * established because the page is going to be freed. If
 278          * instead the kvm page fault establishes the spte before
 279          * ->invalidate_page runs, kvm_unmap_hva will release it
 280          * before returning.
 281          *
 282          * The sequence increase only need to be seen at spin_unlock
 283          * time, and not at spin_lock time.
 284          *
 285          * Increasing the sequence after the spin_unlock would be
 286          * unsafe because the kvm page fault could then establish the
 287          * pte after kvm_unmap_hva returned, without noticing the page
 288          * is going to be freed.
 289          */
 290         idx = srcu_read_lock(&kvm->srcu);
 291         spin_lock(&kvm->mmu_lock);
 292
 293         kvm->mmu_notifier_seq++;
 294         need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty;
 295         /* we've to flush the tlb before the pages can be freed */
 296         if (need_tlb_flush)
 297                 kvm_flush_remote_tlbs(kvm);
 298
 299         spin_unlock(&kvm->mmu_lock);
 300         srcu_read_unlock(&kvm->srcu, idx);
 301 }
 302
 303 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
 304                                         struct mm_struct *mm,
 305                                         unsigned long address,
 306                                         pte_t pte)
 307 {
 308         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 309         int idx;
 310
 311         idx = srcu_read_lock(&kvm->srcu);
 312         spin_lock(&kvm->mmu_lock);
 313         kvm->mmu_notifier_seq++;
 314         kvm_set_spte_hva(kvm, address, pte);
 315         spin_unlock(&kvm->mmu_lock);
 316         srcu_read_unlock(&kvm->srcu, idx);
 317 }
 318
 319 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
 320                                                     struct mm_struct *mm,
 321                                                     unsigned long start,
 322                                                     unsigned long end)
 323 {
 324         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 325         int need_tlb_flush = 0, idx;
 326
 327         idx = srcu_read_lock(&kvm->srcu);
 328         spin_lock(&kvm->mmu_lock);
 329         /*
 330          * The count increase must become visible at unlock time as no
 331          * spte can be established without taking the mmu_lock and
 332          * count is also read inside the mmu_lock critical section.
 333          */
 334         kvm->mmu_notifier_count++;
 335         for (; start < end; start += PAGE_SIZE)
 336                 need_tlb_flush |= kvm_unmap_hva(kvm, start);
 337         need_tlb_flush |= kvm->tlbs_dirty;
 338         /* we've to flush the tlb before the pages can be freed */
 339         if (need_tlb_flush)
 340                 kvm_flush_remote_tlbs(kvm);
 341
 342         spin_unlock(&kvm->mmu_lock);
 343         srcu_read_unlock(&kvm->srcu, idx);
 344 }
 345
 346 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
 347                                                   struct mm_struct *mm,
 348                                                   unsigned long start,
 349                                                   unsigned long end)
 350 {
 351         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 352
 353         spin_lock(&kvm->mmu_lock);
 354         /*
 355          * This sequence increase will notify the kvm page fault that
 356          * the page that is going to be mapped in the spte could have
 357          * been freed.
 358          */
 359         kvm->mmu_notifier_seq++;
 360         /*
 361          * The above sequence increase must be visible before the
 362          * below count decrease but both values are read by the kvm
 363          * page fault under mmu_lock spinlock so we don't need to add
 364          * a smb_wmb() here in between the two.
 365          */
 366         kvm->mmu_notifier_count--;
 367         spin_unlock(&kvm->mmu_lock);
 368
 369         BUG_ON(kvm->mmu_notifier_count < 0);
 370 }
 371
 372 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
 373                                               struct mm_struct *mm,
 374                                               unsigned long address)
 375 {
 376         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 377         int young, idx;
 378
 379         idx = srcu_read_lock(&kvm->srcu);
 380         spin_lock(&kvm->mmu_lock);
 381
 382         young = kvm_age_hva(kvm, address);
 383         if (young)
 384                 kvm_flush_remote_tlbs(kvm);
 385
 386         spin_unlock(&kvm->mmu_lock);
 387         srcu_read_unlock(&kvm->srcu, idx);
 388
 389         return young;
 390 }
 391
 392 static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn,
 393                                        struct mm_struct *mm,
 394                                        unsigned long address)
 395 {
 396         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 397         int young, idx;
 398
 399         idx = srcu_read_lock(&kvm->srcu);
 400         spin_lock(&kvm->mmu_lock);
 401         young = kvm_test_age_hva(kvm, address);
 402         spin_unlock(&kvm->mmu_lock);
 403         srcu_read_unlock(&kvm->srcu, idx);
 404
 405         return young;
 406 }
 407
 408 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
 409                                      struct mm_struct *mm)
 410 {
 411         struct kvm *kvm = mmu_notifier_to_kvm(mn);
 412         int idx;
 413
 414         idx = srcu_read_lock(&kvm->srcu);
 415         kvm_arch_flush_shadow(kvm);
 416         srcu_read_unlock(&kvm->srcu, idx);
 417 }
 418
 419 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
 420         .invalidate_page        = kvm_mmu_notifier_invalidate_page,
 421         .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
 422         .invalidate_range_end   = kvm_mmu_notifier_invalidate_range_end,
 423         .clear_flush_young      = kvm_mmu_notifier_clear_flush_young,
 424         .test_young             = kvm_mmu_notifier_test_young,
 425         .change_pte             = kvm_mmu_notifier_change_pte,
 426         .release                = kvm_mmu_notifier_release,
 427 };
 428
 429 static int kvm_init_mmu_notifier(struct kvm *kvm)
 430 {
 431         kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
 432         return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
 433 }
 434
 435 #else  /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
 436
 437 static int kvm_init_mmu_notifier(struct kvm *kvm)
 438 {
 439         return 0;
 440 }
 441
 442 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
 443
 444 static struct kvm *kvm_create_vm(void)
 445 {
 446         int r, i;
 447         struct kvm *kvm = kvm_arch_alloc_vm();
 448
 449         if (!kvm)
 450                 return ERR_PTR(-ENOMEM);
 451
 452         r = kvm_arch_init_vm(kvm);
 453         if (r)
 454                 goto out_err_nodisable;
 455
 456         r = hardware_enable_all();
 457         if (r)
 458                 goto out_err_nodisable;
 459
 460 #ifdef CONFIG_HAVE_KVM_IRQCHIP
 461         INIT_HLIST_HEAD(&kvm->mask_notifier_list);
 462         INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
 463 #endif
 464
 465         r = -ENOMEM;
 466         kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
 467         if (!kvm->memslots)
 468                 goto out_err_nosrcu;
 469         if (init_srcu_struct(&kvm->srcu))
 470                 goto out_err_nosrcu;
 471         for (i = 0; i < KVM_NR_BUSES; i++) {
 472                 kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus),
 473                                         GFP_KERNEL);
 474                 if (!kvm->buses[i])
 475                         goto out_err;
 476         }
 477
 478         spin_lock_init(&kvm->mmu_lock);
 479         kvm->mm = current->mm;
 480         atomic_inc(&kvm->mm->mm_count);
 481         kvm_eventfd_init(kvm);
 482         mutex_init(&kvm->lock);
 483         mutex_init(&kvm->irq_lock);
 484         mutex_init(&kvm->slots_lock);
 485         atomic_set(&kvm->users_count, 1);
 486
 487         r = kvm_init_mmu_notifier(kvm);
 488         if (r)
 489                 goto out_err;
 490
 491         raw_spin_lock(&kvm_lock);
 492         list_add(&kvm->vm_list, &vm_list);
 493         raw_spin_unlock(&kvm_lock);
 494
 495         return kvm;
 496
 497 out_err:
 498         cleanup_srcu_struct(&kvm->srcu);
 499 out_err_nosrcu:
 500         hardware_disable_all();
 501 out_err_nodisable:
 502         for (i = 0; i < KVM_NR_BUSES; i++)
 503                 kfree(kvm->buses[i]);
 504         kfree(kvm->memslots);
 505         kvm_arch_free_vm(kvm);
 506         return ERR_PTR(r);
 507 }
 508
 509 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
 510 {
 511         if (!memslot->dirty_bitmap)
 512                 return;
 513
 514         if (2 * kvm_dirty_bitmap_bytes(memslot) > PAGE_SIZE)
 515                 vfree(memslot->dirty_bitmap_head);
 516         else
 517                 kfree(memslot->dirty_bitmap_head);
 518
 519         memslot->dirty_bitmap = NULL;
 520         memslot->dirty_bitmap_head = NULL;
 521 }
 522
 523 /*
 524  * Free any memory in @free but not in @dont.
 525  */
 526 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
 527                                   struct kvm_memory_slot *dont)
 528 {
 529         int i;
 530
 531         if (!dont || free->rmap != dont->rmap)
 532                 vfree(free->rmap);
 533
 534         if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
 535                 kvm_destroy_dirty_bitmap(free);
 536
 537
 538         for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
 539                 if (!dont || free->lpage_info[i] != dont->lpage_info[i]) {
 540                         vfree(free->lpage_info[i]);
 541                         free->lpage_info[i] = NULL;
 542                 }
 543         }
 544
 545         free->npages = 0;
 546         free->rmap = NULL;
 547 }
 548
 549 void kvm_free_physmem(struct kvm *kvm)
 550 {
 551         int i;
 552         struct kvm_memslots *slots = kvm->memslots;
 553
 554         for (i = 0; i < slots->nmemslots; ++i)
 555                 kvm_free_physmem_slot(&slots->memslots[i], NULL);
 556
 557         kfree(kvm->memslots);
 558 }
 559
 560 static void kvm_destroy_vm(struct kvm *kvm)
 561 {
 562         int i;
 563         struct mm_struct *mm = kvm->mm;
 564
 565         kvm_arch_sync_events(kvm);
 566         raw_spin_lock(&kvm_lock);
 567         list_del(&kvm->vm_list);
 568         raw_spin_unlock(&kvm_lock);
 569         kvm_free_irq_routing(kvm);
 570         for (i = 0; i < KVM_NR_BUSES; i++)
 571                 kvm_io_bus_destroy(kvm->buses[i]);
 572         kvm_coalesced_mmio_free(kvm);
 573 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
 574         mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
 575 #else
 576         kvm_arch_flush_shadow(kvm);
 577 #endif
 578         kvm_arch_destroy_vm(kvm);
 579         kvm_free_physmem(kvm);
 580         cleanup_srcu_struct(&kvm->srcu);
 581         kvm_arch_free_vm(kvm);
 582         hardware_disable_all();
 583         mmdrop(mm);
 584 }
 585
 586 void kvm_get_kvm(struct kvm *kvm)
 587 {
 588         atomic_inc(&kvm->users_count);
 589 }
 590 EXPORT_SYMBOL_GPL(kvm_get_kvm);
 591
 592 void kvm_put_kvm(struct kvm *kvm)
 593 {
 594         if (atomic_dec_and_test(&kvm->users_count))
 595                 kvm_destroy_vm(kvm);
 596 }
 597 EXPORT_SYMBOL_GPL(kvm_put_kvm);
 598
 599
 600 static int kvm_vm_release(struct inode *inode, struct file *filp)
 601 {
 602         struct kvm *kvm = filp->private_data;
 603
 604         kvm_irqfd_release(kvm);
 605
 606         kvm_put_kvm(kvm);
 607         return 0;
 608 }
 609
 610 #ifndef CONFIG_S390
 611 /*
 612  * Allocation size is twice as large as the actual dirty bitmap size.
 613  * This makes it possible to do double buffering: see x86's
 614  * kvm_vm_ioctl_get_dirty_log().
 615  */
 616 static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
 617 {
 618         unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
 619
 620         if (dirty_bytes > PAGE_SIZE)
 621                 memslot->dirty_bitmap = vzalloc(dirty_bytes);
 622         else
 623                 memslot->dirty_bitmap = kzalloc(dirty_bytes, GFP_KERNEL);
 624
 625         if (!memslot->dirty_bitmap)
 626                 return -ENOMEM;
 627
 628         memslot->dirty_bitmap_head = memslot->dirty_bitmap;
 629         return 0;
 630 }
 631 #endif /* !CONFIG_S390 */
 632
 633 /*
 634  * Allocate some memory and give it an address in the guest physical address
 635  * space.
 636  *
 637  * Discontiguous memory is allowed, mostly for framebuffers.
 638  *
 639  * Must be called holding mmap_sem for write.
 640  */
 641 int __kvm_set_memory_region(struct kvm *kvm,
 642                             struct kvm_userspace_memory_region *mem,
 643                             int user_alloc)
 644 {
 645         int r;
 646         gfn_t base_gfn;
 647         unsigned long npages;
 648         unsigned long i;
 649         struct kvm_memory_slot *memslot;
 650         struct kvm_memory_slot old, new;
 651         struct kvm_memslots *slots, *old_memslots;
 652
 653         r = -EINVAL;
 654         /* General sanity checks */
 655         if (mem->memory_size & (PAGE_SIZE - 1))
 656                 goto out;
 657         if (mem->guest_phys_addr & (PAGE_SIZE - 1))
 658                 goto out;
 659         /* We can read the guest memory with __xxx_user() later on. */
 660         if (user_alloc &&
 661             ((mem->userspace_addr & (PAGE_SIZE - 1)) ||
 662              !access_ok(VERIFY_WRITE,
 663                         (void __user *)(unsigned long)mem->userspace_addr,
 664                         mem->memory_size)))
 665                 goto out;
 666         if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
 667                 goto out;
 668         if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
 669                 goto out;
 670
 671         memslot = &kvm->memslots->memslots[mem->slot];
 672         base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
 673         npages = mem->memory_size >> PAGE_SHIFT;
 674
 675         r = -EINVAL;
 676         if (npages > KVM_MEM_MAX_NR_PAGES)
 677                 goto out;
 678
 679         if (!npages)
 680                 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
 681
 682         new = old = *memslot;
 683
 684         new.id = mem->slot;
 685         new.base_gfn = base_gfn;
 686         new.npages = npages;
 687         new.flags = mem->flags;
 688
 689         /* Disallow changing a memory slot's size. */
 690         r = -EINVAL;
 691         if (npages && old.npages && npages != old.npages)
 692                 goto out_free;
 693
 694         /* Check for overlaps */
 695         r = -EEXIST;
 696         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
 697                 struct kvm_memory_slot *s = &kvm->memslots->memslots[i];
 698
 699                 if (s == memslot || !s->npages)
 700                         continue;
 701                 if (!((base_gfn + npages <= s->base_gfn) ||
 702                       (base_gfn >= s->base_gfn + s->npages)))
 703                         goto out_free;
 704         }
 705
 706         /* Free page dirty bitmap if unneeded */
 707         if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
 708                 new.dirty_bitmap = NULL;
 709
 710         r = -ENOMEM;
 711
 712         /* Allocate if a slot is being created */
 713 #ifndef CONFIG_S390
 714         if (npages && !new.rmap) {
 715                 new.rmap = vzalloc(npages * sizeof(*new.rmap));
 716
 717                 if (!new.rmap)
 718                         goto out_free;
 719
 720                 new.user_alloc = user_alloc;
 721                 new.userspace_addr = mem->userspace_addr;
 722         }
 723         if (!npages)
 724                 goto skip_lpage;
 725
 726         for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
 727                 unsigned long ugfn;
 728                 unsigned long j;
 729                 int lpages;
 730                 int level = i + 2;
 731
 732                 /* Avoid unused variable warning if no large pages */
 733                 (void)level;
 734
 735                 if (new.lpage_info[i])
 736                         continue;
 737
 738                 lpages = 1 + ((base_gfn + npages - 1)
 739                              >> KVM_HPAGE_GFN_SHIFT(level));
 740                 lpages -= base_gfn >> KVM_HPAGE_GFN_SHIFT(level);
 741
 742                 new.lpage_info[i] = vzalloc(lpages * sizeof(*new.lpage_info[i]));
 743
 744                 if (!new.lpage_info[i])
 745                         goto out_free;
 746
 747                 if (base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1))
 748                         new.lpage_info[i][0].write_count = 1;
 749                 if ((base_gfn+npages) & (KVM_PAGES_PER_HPAGE(level) - 1))
 750                         new.lpage_info[i][lpages - 1].write_count = 1;
 751                 ugfn = new.userspace_addr >> PAGE_SHIFT;
 752                 /*
 753                  * If the gfn and userspace address are not aligned wrt each
 754                  * other, or if explicitly asked to, disable large page
 755                  * support for this slot
 756                  */
 757                 if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
 758                     !largepages_enabled)
 759                         for (j = 0; j < lpages; ++j)
 760                                 new.lpage_info[i][j].write_count = 1;
 761         }
 762
 763 skip_lpage:
 764
 765         /* Allocate page dirty bitmap if needed */
 766         if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
 767                 if (kvm_create_dirty_bitmap(&new) < 0)
 768                         goto out_free;
 769                 /* destroy any largepage mappings for dirty tracking */
 770         }
 771 #else  /* not defined CONFIG_S390 */
 772         new.user_alloc = user_alloc;
 773         if (user_alloc)
 774                 new.userspace_addr = mem->userspace_addr;
 775 #endif /* not defined CONFIG_S390 */
 776
 777         if (!npages) {
 778                 r = -ENOMEM;
 779                 slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
 780                 if (!slots)
 781                         goto out_free;
 782                 memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
 783                 if (mem->slot >= slots->nmemslots)
 784                         slots->nmemslots = mem->slot + 1;
 785                 slots->generation++;
 786                 slots->memslots[mem->slot].flags |= KVM_MEMSLOT_INVALID;
 787
 788                 old_memslots = kvm->memslots;
 789                 rcu_assign_pointer(kvm->memslots, slots);
 790                 synchronize_srcu_expedited(&kvm->srcu);
 791                 /* From this point no new shadow pages pointing to a deleted
 792                  * memslot will be created.
 793                  *
 794                  * validation of sp->gfn happens in:
 795                  *      - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
 796                  *      - kvm_is_visible_gfn (mmu_check_roots)
 797                  */
 798                 kvm_arch_flush_shadow(kvm);
 799                 kfree(old_memslots);
 800         }
 801
 802         r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc);
 803         if (r)
 804                 goto out_free;
 805
 806         /* map/unmap the pages in iommu page table */
 807         if (npages) {
 808                 r = kvm_iommu_map_pages(kvm, &new);
 809                 if (r)
 810                         goto out_free;
 811         } else
 812                 kvm_iommu_unmap_pages(kvm, &old);
 813
 814         r = -ENOMEM;
 815         slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
 816         if (!slots)
 817                 goto out_free;
 818         memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
 819         if (mem->slot >= slots->nmemslots)
 820                 slots->nmemslots = mem->slot + 1;
 821         slots->generation++;
 822
 823         /* actual memory is freed via old in kvm_free_physmem_slot below */
 824         if (!npages) {
 825                 new.rmap = NULL;
 826                 new.dirty_bitmap = NULL;
 827                 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i)
 828                         new.lpage_info[i] = NULL;
 829         }
 830
 831         slots->memslots[mem->slot] = new;
 832         old_memslots = kvm->memslots;
 833         rcu_assign_pointer(kvm->memslots, slots);
 834         synchronize_srcu_expedited(&kvm->srcu);
 835
 836         kvm_arch_commit_memory_region(kvm, mem, old, user_alloc);
 837
 838         /*
 839          * If the new memory slot is created, we need to clear all
 840          * mmio sptes.
 841          */
 842         if (npages && old.base_gfn != mem->guest_phys_addr >> PAGE_SHIFT)
 843                 kvm_arch_flush_shadow(kvm);
 844
 845         kvm_free_physmem_slot(&old, &new);
 846         kfree(old_memslots);
 847
 848         return 0;
 849
 850 out_free:
 851         kvm_free_physmem_slot(&new, &old);
 852 out:
 853         return r;
 854
 855 }
 856 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
 857
 858 int kvm_set_memory_region(struct kvm *kvm,
 859                           struct kvm_userspace_memory_region *mem,
 860                           int user_alloc)
 861 {
 862         int r;
 863
 864         mutex_lock(&kvm->slots_lock);
 865         r = __kvm_set_memory_region(kvm, mem, user_alloc);
 866         mutex_unlock(&kvm->slots_lock);
 867         return r;
 868 }
 869 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
 870
 871 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
 872                                    struct
 873                                    kvm_userspace_memory_region *mem,
 874                                    int user_alloc)
 875 {
 876         if (mem->slot >= KVM_MEMORY_SLOTS)
 877                 return -EINVAL;
 878         return kvm_set_memory_region(kvm, mem, user_alloc);
 879 }
 880
 881 int kvm_get_dirty_log(struct kvm *kvm,
 882                         struct kvm_dirty_log *log, int *is_dirty)
 883 {
 884         struct kvm_memory_slot *memslot;
 885         int r, i;
 886         unsigned long n;
 887         unsigned long any = 0;
 888
 889         r = -EINVAL;
 890         if (log->slot >= KVM_MEMORY_SLOTS)
 891                 goto out;
 892
 893         memslot = &kvm->memslots->memslots[log->slot];
 894         r = -ENOENT;
 895         if (!memslot->dirty_bitmap)
 896                 goto out;
 897
 898         n = kvm_dirty_bitmap_bytes(memslot);
 899
 900         for (i = 0; !any && i < n/sizeof(long); ++i)
 901                 any = memslot->dirty_bitmap[i];
 902
 903         r = -EFAULT;
 904         if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
 905                 goto out;
 906
 907         if (any)
 908                 *is_dirty = 1;
 909
 910         r = 0;
 911 out:
 912         return r;
 913 }
 914
 915 void kvm_disable_largepages(void)
 916 {
 917         largepages_enabled = false;
 918 }
 919 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
 920
 921 int is_error_page(struct page *page)
 922 {
 923         return page == bad_page || page == hwpoison_page || page == fault_page;
 924 }
 925 EXPORT_SYMBOL_GPL(is_error_page);
 926
 927 int is_error_pfn(pfn_t pfn)
 928 {
 929         return pfn == bad_pfn || pfn == hwpoison_pfn || pfn == fault_pfn;
 930 }
 931 EXPORT_SYMBOL_GPL(is_error_pfn);
 932
 933 int is_hwpoison_pfn(pfn_t pfn)
 934 {
 935         return pfn == hwpoison_pfn;
 936 }
 937 EXPORT_SYMBOL_GPL(is_hwpoison_pfn);
 938
 939 int is_fault_pfn(pfn_t pfn)
 940 {
 941         return pfn == fault_pfn;
 942 }
 943 EXPORT_SYMBOL_GPL(is_fault_pfn);
 944
 945 int is_noslot_pfn(pfn_t pfn)
 946 {
 947         return pfn == bad_pfn;
 948 }
 949 EXPORT_SYMBOL_GPL(is_noslot_pfn);
 950
 951 int is_invalid_pfn(pfn_t pfn)
 952 {
 953         return pfn == hwpoison_pfn || pfn == fault_pfn;
 954 }
 955 EXPORT_SYMBOL_GPL(is_invalid_pfn);
 956
 957 static inline unsigned long bad_hva(void)
 958 {
 959         return PAGE_OFFSET;
 960 }
 961
 962 int kvm_is_error_hva(unsigned long addr)
 963 {
 964         return addr == bad_hva();
 965 }
 966 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
 967
 968 static struct kvm_memory_slot *__gfn_to_memslot(struct kvm_memslots *slots,
 969                                                 gfn_t gfn)
 970 {
 971         int i;
 972
 973         for (i = 0; i < slots->nmemslots; ++i) {
 974                 struct kvm_memory_slot *memslot = &slots->memslots[i];
 975
 976                 if (gfn >= memslot->base_gfn
 977                     && gfn < memslot->base_gfn + memslot->npages)
 978                         return memslot;
 979         }
 980         return NULL;
 981 }
 982
 983 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
 984 {
 985         return __gfn_to_memslot(kvm_memslots(kvm), gfn);
 986 }
 987 EXPORT_SYMBOL_GPL(gfn_to_memslot);
 988
 989 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
 990 {
 991         int i;
 992         struct kvm_memslots *slots = kvm_memslots(kvm);
 993
 994         for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
 995                 struct kvm_memory_slot *memslot = &slots->memslots[i];
 996
 997                 if (memslot->flags & KVM_MEMSLOT_INVALID)
 998                         continue;
 999
1000                 if (gfn >= memslot->base_gfn
1001                     && gfn < memslot->base_gfn + memslot->npages)
1002                         return 1;
1003         }
1004         return 0;
1005 }
1006 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
1007
1008 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
1009 {
1010         struct vm_area_struct *vma;
1011         unsigned long addr, size;
1012
1013         size = PAGE_SIZE;
1014
1015         addr = gfn_to_hva(kvm, gfn);
1016         if (kvm_is_error_hva(addr))
1017                 return PAGE_SIZE;
1018
1019         down_read(&current->mm->mmap_sem);
1020         vma = find_vma(current->mm, addr);
1021         if (!vma)
1022                 goto out;
1023
1024         size = vma_kernel_pagesize(vma);
1025
1026 out:
1027         up_read(&current->mm->mmap_sem);
1028
1029         return size;
1030 }
1031
1032 static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1033                                      gfn_t *nr_pages)
1034 {
1035         if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
1036                 return bad_hva();
1037
1038         if (nr_pages)
1039                 *nr_pages = slot->npages - (gfn - slot->base_gfn);
1040
1041         return gfn_to_hva_memslot(slot, gfn);
1042 }
1043
1044 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1045 {
1046         return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
1047 }
1048 EXPORT_SYMBOL_GPL(gfn_to_hva);
1049
1050 static pfn_t get_fault_pfn(void)
1051 {
1052         get_page(fault_page);
1053         return fault_pfn;
1054 }
1055
1056 int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm,
1057         unsigned long start, int write, struct page **page)
1058 {
1059         int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET;
1060
1061         if (write)
1062                 flags |= FOLL_WRITE;
1063
1064         return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL);
1065 }
1066
1067 static inline int check_user_page_hwpoison(unsigned long addr)
1068 {
1069         int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE;
1070
1071         rc = __get_user_pages(current, current->mm, addr, 1,
1072                               flags, NULL, NULL, NULL);
1073         return rc == -EHWPOISON;
1074 }
1075
1076 static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic,
1077                         bool *async, bool write_fault, bool *writable)
1078 {
1079         struct page *page[1];
1080         int npages = 0;
1081         pfn_t pfn;
1082
1083         /* we can do it either atomically or asynchronously, not both */
1084         BUG_ON(atomic && async);
1085
1086         BUG_ON(!write_fault && !writable);
1087
1088         if (writable)
1089                 *writable = true;
1090
1091         if (atomic || async)
1092                 npages = __get_user_pages_fast(addr, 1, 1, page);
1093
1094         if (unlikely(npages != 1) && !atomic) {
1095                 might_sleep();
1096
1097                 if (writable)
1098                         *writable = write_fault;
1099
1100                 if (async) {
1101                         down_read(&current->mm->mmap_sem);
1102                         npages = get_user_page_nowait(current, current->mm,
1103                                                      addr, write_fault, page);
1104                         up_read(&current->mm->mmap_sem);
1105                 } else
1106                         npages = get_user_pages_fast(addr, 1, write_fault,
1107                                                      page);
1108
1109                 /* map read fault as writable if possible */
1110                 if (unlikely(!write_fault) && npages == 1) {
1111                         struct page *wpage[1];
1112
1113                         npages = __get_user_pages_fast(addr, 1, 1, wpage);
1114                         if (npages == 1) {
1115                                 *writable = true;
1116                                 put_page(page[0]);
1117                                 page[0] = wpage[0];
1118                         }
1119                         npages = 1;
1120                 }
1121         }
1122
1123         if (unlikely(npages != 1)) {
1124                 struct vm_area_struct *vma;
1125
1126                 if (atomic)
1127                         return get_fault_pfn();
1128
1129                 down_read(&current->mm->mmap_sem);
1130                 if (npages == -EHWPOISON ||
1131                         (!async && check_user_page_hwpoison(addr))) {
1132                         up_read(&current->mm->mmap_sem);
1133                         get_page(hwpoison_page);
1134                         return page_to_pfn(hwpoison_page);
1135                 }
1136
1137                 vma = find_vma_intersection(current->mm, addr, addr+1);
1138
1139                 if (vma == NULL)
1140                         pfn = get_fault_pfn();
1141                 else if ((vma->vm_flags & VM_PFNMAP)) {
1142                         pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) +
1143                                 vma->vm_pgoff;
1144                         BUG_ON(!kvm_is_mmio_pfn(pfn));
1145                 } else {
1146                         if (async && (vma->vm_flags & VM_WRITE))
1147                                 *async = true;
1148                         pfn = get_fault_pfn();
1149                 }
1150                 up_read(&current->mm->mmap_sem);
1151         } else
1152                 pfn = page_to_pfn(page[0]);
1153
1154         return pfn;
1155 }
1156
1157 pfn_t hva_to_pfn_atomic(struct kvm *kvm, unsigned long addr)
1158 {
1159         return hva_to_pfn(kvm, addr, true, NULL, true, NULL);
1160 }
1161 EXPORT_SYMBOL_GPL(hva_to_pfn_atomic);
1162
1163 static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async,
1164                           bool write_fault, bool *writable)
1165 {
1166         unsigned long addr;
1167
1168         if (async)
1169                 *async = false;
1170
1171         addr = gfn_to_hva(kvm, gfn);
1172         if (kvm_is_error_hva(addr)) {
1173                 get_page(bad_page);
1174                 return page_to_pfn(bad_page);
1175         }
1176
1177         return hva_to_pfn(kvm, addr, atomic, async, write_fault, writable);
1178 }
1179
1180 pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
1181 {
1182         return __gfn_to_pfn(kvm, gfn, true, NULL, true, NULL);
1183 }
1184 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
1185
1186 pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async,
1187                        bool write_fault, bool *writable)
1188 {
1189         return __gfn_to_pfn(kvm, gfn, false, async, write_fault, writable);
1190 }
1191 EXPORT_SYMBOL_GPL(gfn_to_pfn_async);
1192
1193 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1194 {
1195         return __gfn_to_pfn(kvm, gfn, false, NULL, true, NULL);
1196 }
1197 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1198
1199 pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1200                       bool *writable)
1201 {
1202         return __gfn_to_pfn(kvm, gfn, false, NULL, write_fault, writable);
1203 }
1204 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
1205
1206 pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
1207                          struct kvm_memory_slot *slot, gfn_t gfn)
1208 {
1209         unsigned long addr = gfn_to_hva_memslot(slot, gfn);
1210         return hva_to_pfn(kvm, addr, false, NULL, true, NULL);
1211 }
1212
1213 int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
1214                                                                   int nr_pages)
1215 {
1216         unsigned long addr;
1217         gfn_t entry;
1218
1219         addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry);
1220         if (kvm_is_error_hva(addr))
1221                 return -1;
1222
1223         if (entry < nr_pages)
1224                 return 0;
1225
1226         return __get_user_pages_fast(addr, nr_pages, 1, pages);
1227 }
1228 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
1229
1230 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1231 {
1232         pfn_t pfn;
1233
1234         pfn = gfn_to_pfn(kvm, gfn);
1235         if (!kvm_is_mmio_pfn(pfn))
1236                 return pfn_to_page(pfn);
1237
1238         WARN_ON(kvm_is_mmio_pfn(pfn));
1239
1240         get_page(bad_page);
1241         return bad_page;
1242 }
1243
1244 EXPORT_SYMBOL_GPL(gfn_to_page);
1245
1246 void kvm_release_page_clean(struct page *page)
1247 {
1248         kvm_release_pfn_clean(page_to_pfn(page));
1249 }
1250 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1251
1252 void kvm_release_pfn_clean(pfn_t pfn)
1253 {
1254         if (!kvm_is_mmio_pfn(pfn))
1255                 put_page(pfn_to_page(pfn));
1256 }
1257 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1258
1259 void kvm_release_page_dirty(struct page *page)
1260 {
1261         kvm_release_pfn_dirty(page_to_pfn(page));
1262 }
1263 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1264
1265 void kvm_release_pfn_dirty(pfn_t pfn)
1266 {
1267         kvm_set_pfn_dirty(pfn);
1268         kvm_release_pfn_clean(pfn);
1269 }
1270 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1271
1272 void kvm_set_page_dirty(struct page *page)
1273 {
1274         kvm_set_pfn_dirty(page_to_pfn(page));
1275 }
1276 EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
1277
1278 void kvm_set_pfn_dirty(pfn_t pfn)
1279 {
1280         if (!kvm_is_mmio_pfn(pfn)) {
1281                 struct page *page = pfn_to_page(pfn);
1282                 if (!PageReserved(page))
1283                         SetPageDirty(page);
1284         }
1285 }
1286 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1287
1288 void kvm_set_pfn_accessed(pfn_t pfn)
1289 {
1290         if (!kvm_is_mmio_pfn(pfn))
1291                 mark_page_accessed(pfn_to_page(pfn));
1292 }
1293 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1294
1295 void kvm_get_pfn(pfn_t pfn)
1296 {
1297         if (!kvm_is_mmio_pfn(pfn))
1298                 get_page(pfn_to_page(pfn));
1299 }
1300 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1301
1302 static int next_segment(unsigned long len, int offset)
1303 {
1304         if (len > PAGE_SIZE - offset)
1305                 return PAGE_SIZE - offset;
1306         else
1307                 return len;
1308 }
1309
1310 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1311                         int len)
1312 {
1313         int r;
1314         unsigned long addr;
1315
1316         addr = gfn_to_hva(kvm, gfn);
1317         if (kvm_is_error_hva(addr))
1318                 return -EFAULT;
1319         r = __copy_from_user(data, (void __user *)addr + offset, len);
1320         if (r)
1321                 return -EFAULT;
1322         return 0;
1323 }
1324 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1325
1326 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1327 {
1328         gfn_t gfn = gpa >> PAGE_SHIFT;
1329         int seg;
1330         int offset = offset_in_page(gpa);
1331         int ret;
1332
1333         while ((seg = next_segment(len, offset)) != 0) {
1334                 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1335                 if (ret < 0)
1336                         return ret;
1337                 offset = 0;
1338                 len -= seg;
1339                 data += seg;
1340                 ++gfn;
1341         }
1342         return 0;
1343 }
1344 EXPORT_SYMBOL_GPL(kvm_read_guest);
1345
1346 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1347                           unsigned long len)
1348 {
1349         int r;
1350         unsigned long addr;
1351         gfn_t gfn = gpa >> PAGE_SHIFT;
1352         int offset = offset_in_page(gpa);
1353
1354         addr = gfn_to_hva(kvm, gfn);
1355         if (kvm_is_error_hva(addr))
1356                 return -EFAULT;
1357         pagefault_disable();
1358         r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1359         pagefault_enable();
1360         if (r)
1361                 return -EFAULT;
1362         return 0;
1363 }
1364 EXPORT_SYMBOL(kvm_read_guest_atomic);
1365
1366 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1367                          int offset, int len)
1368 {
1369         int r;
1370         unsigned long addr;
1371
1372         addr = gfn_to_hva(kvm, gfn);
1373         if (kvm_is_error_hva(addr))
1374                 return -EFAULT;
1375         r = __copy_to_user((void __user *)addr + offset, data, len);
1376         if (r)
1377                 return -EFAULT;
1378         mark_page_dirty(kvm, gfn);
1379         return 0;
1380 }
1381 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1382
1383 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1384                     unsigned long len)
1385 {
1386         gfn_t gfn = gpa >> PAGE_SHIFT;
1387         int seg;
1388         int offset = offset_in_page(gpa);
1389         int ret;
1390
1391         while ((seg = next_segment(len, offset)) != 0) {
1392                 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1393                 if (ret < 0)
1394                         return ret;
1395                 offset = 0;
1396                 len -= seg;
1397                 data += seg;
1398                 ++gfn;
1399         }
1400         return 0;
1401 }
1402
1403 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1404                               gpa_t gpa)
1405 {
1406         struct kvm_memslots *slots = kvm_memslots(kvm);
1407         int offset = offset_in_page(gpa);
1408         gfn_t gfn = gpa >> PAGE_SHIFT;
1409
1410         ghc->gpa = gpa;
1411         ghc->generation = slots->generation;
1412         ghc->memslot = __gfn_to_memslot(slots, gfn);
1413         ghc->hva = gfn_to_hva_many(ghc->memslot, gfn, NULL);
1414         if (!kvm_is_error_hva(ghc->hva))
1415                 ghc->hva += offset;
1416         else
1417                 return -EFAULT;
1418
1419         return 0;
1420 }
1421 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
1422
1423 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1424                            void *data, unsigned long len)
1425 {
1426         struct kvm_memslots *slots = kvm_memslots(kvm);
1427         int r;
1428
1429         if (slots->generation != ghc->generation)
1430                 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
1431
1432         if (kvm_is_error_hva(ghc->hva))
1433                 return -EFAULT;
1434
1435         r = __copy_to_user((void __user *)ghc->hva, data, len);
1436         if (r)
1437                 return -EFAULT;
1438         mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT);
1439
1440         return 0;
1441 }
1442 EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
1443
1444 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1445                            void *data, unsigned long len)
1446 {
1447         struct kvm_memslots *slots = kvm_memslots(kvm);
1448         int r;
1449
1450         if (slots->generation != ghc->generation)
1451                 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
1452
1453         if (kvm_is_error_hva(ghc->hva))
1454                 return -EFAULT;
1455
1456         r = __copy_from_user(data, (void __user *)ghc->hva, len);
1457         if (r)
1458                 return -EFAULT;
1459
1460         return 0;
1461 }
1462 EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
1463
1464 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1465 {
1466         return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page,
1467                                     offset, len);
1468 }
1469 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1470
1471 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1472 {
1473         gfn_t gfn = gpa >> PAGE_SHIFT;
1474         int seg;
1475         int offset = offset_in_page(gpa);
1476         int ret;
1477
1478         while ((seg = next_segment(len, offset)) != 0) {
1479                 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1480                 if (ret < 0)
1481                         return ret;
1482                 offset = 0;
1483                 len -= seg;
1484                 ++gfn;
1485         }
1486         return 0;
1487 }
1488 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1489
1490 void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot,
1491                              gfn_t gfn)
1492 {
1493         if (memslot && memslot->dirty_bitmap) {
1494                 unsigned long rel_gfn = gfn - memslot->base_gfn;
1495
1496                 __set_bit_le(rel_gfn, memslot->dirty_bitmap);
1497         }
1498 }
1499
1500 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1501 {
1502         struct kvm_memory_slot *memslot;
1503
1504         memslot = gfn_to_memslot(kvm, gfn);
1505         mark_page_dirty_in_slot(kvm, memslot, gfn);
1506 }
1507
1508 /*
1509  * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1510  */
1511 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1512 {
1513         DEFINE_WAIT(wait);
1514
1515         for (;;) {
1516                 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1517
1518                 if (kvm_arch_vcpu_runnable(vcpu)) {
1519                         kvm_make_request(KVM_REQ_UNHALT, vcpu);
1520                         break;
1521                 }
1522                 if (kvm_cpu_has_pending_timer(vcpu))
1523                         break;
1524                 if (signal_pending(current))
1525                         break;
1526
1527                 schedule();
1528         }
1529
1530         finish_wait(&vcpu->wq, &wait);
1531 }
1532
1533 void kvm_resched(struct kvm_vcpu *vcpu)
1534 {
1535         if (!need_resched())
1536                 return;
1537         cond_resched();
1538 }
1539 EXPORT_SYMBOL_GPL(kvm_resched);
1540
1541 void kvm_vcpu_on_spin(struct kvm_vcpu *me)
1542 {
1543         struct kvm *kvm = me->kvm;
1544         struct kvm_vcpu *vcpu;
1545         int last_boosted_vcpu = me->kvm->last_boosted_vcpu;
1546         int yielded = 0;
1547         int pass;
1548         int i;
1549
1550         /*
1551          * We boost the priority of a VCPU that is runnable but not
1552          * currently running, because it got preempted by something
1553          * else and called schedule in __vcpu_run.  Hopefully that
1554          * VCPU is holding the lock that we need and will release it.
1555          * We approximate round-robin by starting at the last boosted VCPU.
1556          */
1557         for (pass = 0; pass < 2 && !yielded; pass++) {
1558                 kvm_for_each_vcpu(i, vcpu, kvm) {
1559                         struct task_struct *task = NULL;
1560                         struct pid *pid;
1561                         if (!pass && i < last_boosted_vcpu) {
1562                                 i = last_boosted_vcpu;
1563                                 continue;
1564                         } else if (pass && i > last_boosted_vcpu)
1565                                 break;
1566                         if (vcpu == me)
1567                                 continue;
1568                         if (waitqueue_active(&vcpu->wq))
1569                                 continue;
1570                         rcu_read_lock();
1571                         pid = rcu_dereference(vcpu->pid);
1572                         if (pid)
1573                                 task = get_pid_task(vcpu->pid, PIDTYPE_PID);
1574                         rcu_read_unlock();
1575                         if (!task)
1576                                 continue;
1577                         if (task->flags & PF_VCPU) {
1578                                 put_task_struct(task);
1579                                 continue;
1580                         }
1581                         if (yield_to(task, 1)) {
1582                                 put_task_struct(task);
1583                                 kvm->last_boosted_vcpu = i;
1584                                 yielded = 1;
1585                                 break;
1586                         }
1587                         put_task_struct(task);
1588                 }
1589         }
1590 }
1591 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
1592
1593 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1594 {
1595         struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1596         struct page *page;
1597
1598         if (vmf->pgoff == 0)
1599                 page = virt_to_page(vcpu->run);
1600 #ifdef CONFIG_X86
1601         else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
1602                 page = virt_to_page(vcpu->arch.pio_data);
1603 #endif
1604 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1605         else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1606                 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1607 #endif
1608         else
1609                 return VM_FAULT_SIGBUS;
1610         get_page(page);
1611         vmf->page = page;
1612         return 0;
1613 }
1614
1615 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
1616         .fault = kvm_vcpu_fault,
1617 };
1618
1619 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1620 {
1621         vma->vm_ops = &kvm_vcpu_vm_ops;
1622         return 0;
1623 }
1624
1625 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1626 {
1627         struct kvm_vcpu *vcpu = filp->private_data;
1628
1629         kvm_put_kvm(vcpu->kvm);
1630         return 0;
1631 }
1632
1633 static struct file_operations kvm_vcpu_fops = {
1634         .release        = kvm_vcpu_release,
1635         .unlocked_ioctl = kvm_vcpu_ioctl,
1636 #ifdef CONFIG_COMPAT
1637         .compat_ioctl   = kvm_vcpu_compat_ioctl,
1638 #endif
1639         .mmap           = kvm_vcpu_mmap,
1640         .llseek         = noop_llseek,
1641 };
1642
1643 /*
1644  * Allocates an inode for the vcpu.
1645  */
1646 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1647 {
1648         return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR);
1649 }
1650
1651 /*
1652  * Creates some virtual cpus.  Good luck creating more than one.
1653  */
1654 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
1655 {
1656         int r;
1657         struct kvm_vcpu *vcpu, *v;
1658
1659         vcpu = kvm_arch_vcpu_create(kvm, id);
1660         if (IS_ERR(vcpu))
1661                 return PTR_ERR(vcpu);
1662
1663         preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1664
1665         r = kvm_arch_vcpu_setup(vcpu);
1666         if (r)
1667                 goto vcpu_destroy;
1668
1669         mutex_lock(&kvm->lock);
1670         if (!kvm_vcpu_compatible(vcpu)) {
1671                 r = -EINVAL;
1672                 goto unlock_vcpu_destroy;
1673         }
1674         if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
1675                 r = -EINVAL;
1676                 goto unlock_vcpu_destroy;
1677         }
1678
1679         kvm_for_each_vcpu(r, v, kvm)
1680                 if (v->vcpu_id == id) {
1681                         r = -EEXIST;
1682                         goto unlock_vcpu_destroy;
1683                 }
1684
1685         BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
1686
1687         /* Now it's all set up, let userspace reach it */
1688         kvm_get_kvm(kvm);
1689         r = create_vcpu_fd(vcpu);
1690         if (r < 0) {
1691                 kvm_put_kvm(kvm);
1692                 goto unlock_vcpu_destroy;
1693         }
1694
1695         kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
1696         smp_wmb();
1697         atomic_inc(&kvm->online_vcpus);
1698
1699 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1700         if (kvm->bsp_vcpu_id == id)
1701                 kvm->bsp_vcpu = vcpu;
1702 #endif
1703         mutex_unlock(&kvm->lock);
1704         return r;
1705
1706 unlock_vcpu_destroy:
1707         mutex_unlock(&kvm->lock);
1708 vcpu_destroy:
1709         kvm_arch_vcpu_destroy(vcpu);
1710         return r;
1711 }
1712
1713 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1714 {
1715         if (sigset) {
1716                 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1717                 vcpu->sigset_active = 1;
1718                 vcpu->sigset = *sigset;
1719         } else
1720                 vcpu->sigset_active = 0;
1721         return 0;
1722 }
1723
1724 static long kvm_vcpu_ioctl(struct file *filp,
1725                            unsigned int ioctl, unsigned long arg)
1726 {
1727         struct kvm_vcpu *vcpu = filp->private_data;
1728         void __user *argp = (void __user *)arg;
1729         int r;
1730         struct kvm_fpu *fpu = NULL;
1731         struct kvm_sregs *kvm_sregs = NULL;
1732
1733         if (vcpu->kvm->mm != current->mm)
1734                 return -EIO;
1735
1736 #if defined(CONFIG_S390) || defined(CONFIG_PPC)
1737         /*
1738          * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1739          * so vcpu_load() would break it.
1740          */
1741         if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT)
1742                 return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1743 #endif
1744
1745
1746         vcpu_load(vcpu);
1747         switch (ioctl) {
1748         case KVM_RUN:
1749                 r = -EINVAL;
1750                 if (arg)
1751                         goto out;
1752                 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
1753                 trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
1754                 break;
1755         case KVM_GET_REGS: {
1756                 struct kvm_regs *kvm_regs;
1757
1758                 r = -ENOMEM;
1759                 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1760                 if (!kvm_regs)
1761                         goto out;
1762                 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
1763                 if (r)
1764                         goto out_free1;
1765                 r = -EFAULT;
1766                 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1767                         goto out_free1;
1768                 r = 0;
1769 out_free1:
1770                 kfree(kvm_regs);
1771                 break;
1772         }
1773         case KVM_SET_REGS: {
1774                 struct kvm_regs *kvm_regs;
1775
1776                 r = -ENOMEM;
1777                 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1778                 if (!kvm_regs)
1779                         goto out;
1780                 r = -EFAULT;
1781                 if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs)))
1782                         goto out_free2;
1783                 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
1784                 if (r)
1785                         goto out_free2;
1786                 r = 0;
1787 out_free2:
1788                 kfree(kvm_regs);
1789                 break;
1790         }
1791         case KVM_GET_SREGS: {
1792                 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1793                 r = -ENOMEM;
1794                 if (!kvm_sregs)
1795                         goto out;
1796                 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
1797                 if (r)
1798                         goto out;
1799                 r = -EFAULT;
1800                 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
1801                         goto out;
1802                 r = 0;
1803                 break;
1804         }
1805         case KVM_SET_SREGS: {
1806                 kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1807                 r = -ENOMEM;
1808                 if (!kvm_sregs)
1809                         goto out;
1810                 r = -EFAULT;
1811                 if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs)))
1812                         goto out;
1813                 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
1814                 if (r)
1815                         goto out;
1816                 r = 0;
1817                 break;
1818         }
1819         case KVM_GET_MP_STATE: {
1820                 struct kvm_mp_state mp_state;
1821
1822                 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
1823                 if (r)
1824                         goto out;
1825                 r = -EFAULT;
1826                 if (copy_to_user(argp, &mp_state, sizeof mp_state))
1827                         goto out;
1828                 r = 0;
1829                 break;
1830         }
1831         case KVM_SET_MP_STATE: {
1832                 struct kvm_mp_state mp_state;
1833
1834                 r = -EFAULT;
1835                 if (copy_from_user(&mp_state, argp, sizeof mp_state))
1836                         goto out;
1837                 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
1838                 if (r)
1839                         goto out;
1840                 r = 0;
1841                 break;
1842         }
1843         case KVM_TRANSLATE: {
1844                 struct kvm_translation tr;
1845
1846                 r = -EFAULT;
1847                 if (copy_from_user(&tr, argp, sizeof tr))
1848                         goto out;
1849                 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
1850                 if (r)
1851                         goto out;
1852                 r = -EFAULT;
1853                 if (copy_to_user(argp, &tr, sizeof tr))
1854                         goto out;
1855                 r = 0;
1856                 break;
1857         }
1858         case KVM_SET_GUEST_DEBUG: {
1859                 struct kvm_guest_debug dbg;
1860
1861                 r = -EFAULT;
1862                 if (copy_from_user(&dbg, argp, sizeof dbg))
1863                         goto out;
1864                 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
1865                 if (r)
1866                         goto out;
1867                 r = 0;
1868                 break;
1869         }
1870         case KVM_SET_SIGNAL_MASK: {
1871                 struct kvm_signal_mask __user *sigmask_arg = argp;
1872                 struct kvm_signal_mask kvm_sigmask;
1873                 sigset_t sigset, *p;
1874
1875                 p = NULL;
1876                 if (argp) {
1877                         r = -EFAULT;
1878                         if (copy_from_user(&kvm_sigmask, argp,
1879                                            sizeof kvm_sigmask))
1880                                 goto out;
1881                         r = -EINVAL;
1882                         if (kvm_sigmask.len != sizeof sigset)
1883                                 goto out;
1884                         r = -EFAULT;
1885                         if (copy_from_user(&sigset, sigmask_arg->sigset,
1886                                            sizeof sigset))
1887                                 goto out;
1888                         p = &sigset;
1889                 }
1890                 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
1891                 break;
1892         }
1893         case KVM_GET_FPU: {
1894                 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1895                 r = -ENOMEM;
1896                 if (!fpu)
1897                         goto out;
1898                 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
1899                 if (r)
1900                         goto out;
1901                 r = -EFAULT;
1902                 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
1903                         goto out;
1904                 r = 0;
1905                 break;
1906         }
1907         case KVM_SET_FPU: {
1908                 fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1909                 r = -ENOMEM;
1910                 if (!fpu)
1911                         goto out;
1912                 r = -EFAULT;
1913                 if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu)))
1914                         goto out;
1915                 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
1916                 if (r)
1917                         goto out;
1918                 r = 0;
1919                 break;
1920         }
1921         default:
1922                 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1923         }
1924 out:
1925         vcpu_put(vcpu);
1926         kfree(fpu);
1927         kfree(kvm_sregs);
1928         return r;
1929 }
1930
1931 #ifdef CONFIG_COMPAT
1932 static long kvm_vcpu_compat_ioctl(struct file *filp,
1933                                   unsigned int ioctl, unsigned long arg)
1934 {
1935         struct kvm_vcpu *vcpu = filp->private_data;
1936         void __user *argp = compat_ptr(arg);
1937         int r;
1938
1939         if (vcpu->kvm->mm != current->mm)
1940                 return -EIO;
1941
1942         switch (ioctl) {
1943         case KVM_SET_SIGNAL_MASK: {
1944                 struct kvm_signal_mask __user *sigmask_arg = argp;
1945                 struct kvm_signal_mask kvm_sigmask;
1946                 compat_sigset_t csigset;
1947                 sigset_t sigset;
1948
1949                 if (argp) {
1950                         r = -EFAULT;
1951                         if (copy_from_user(&kvm_sigmask, argp,
1952                                            sizeof kvm_sigmask))
1953                                 goto out;
1954                         r = -EINVAL;
1955                         if (kvm_sigmask.len != sizeof csigset)
1956                                 goto out;
1957                         r = -EFAULT;
1958                         if (copy_from_user(&csigset, sigmask_arg->sigset,
1959                                            sizeof csigset))
1960                                 goto out;
1961                 }
1962                 sigset_from_compat(&sigset, &csigset);
1963                 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
1964                 break;
1965         }
1966         default:
1967                 r = kvm_vcpu_ioctl(filp, ioctl, arg);
1968         }
1969
1970 out:
1971         return r;
1972 }
1973 #endif
1974
1975 static long kvm_vm_ioctl(struct file *filp,
1976                            unsigned int ioctl, unsigned long arg)
1977 {
1978         struct kvm *kvm = filp->private_data;
1979         void __user *argp = (void __user *)arg;
1980         int r;
1981
1982         if (kvm->mm != current->mm)
1983                 return -EIO;
1984         switch (ioctl) {
1985         case KVM_CREATE_VCPU:
1986                 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
1987                 if (r < 0)
1988                         goto out;
1989                 break;
1990         case KVM_SET_USER_MEMORY_REGION: {
1991                 struct kvm_userspace_memory_region kvm_userspace_mem;
1992
1993                 r = -EFAULT;
1994                 if (copy_from_user(&kvm_userspace_mem, argp,
1995                                                 sizeof kvm_userspace_mem))
1996                         goto out;
1997
1998                 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
1999                 if (r)
2000                         goto out;
2001                 break;
2002         }
2003         case KVM_GET_DIRTY_LOG: {
2004                 struct kvm_dirty_log log;
2005
2006                 r = -EFAULT;
2007                 if (copy_from_user(&log, argp, sizeof log))
2008                         goto out;
2009                 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2010                 if (r)
2011                         goto out;
2012                 break;
2013         }
2014 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2015         case KVM_REGISTER_COALESCED_MMIO: {
2016                 struct kvm_coalesced_mmio_zone zone;
2017                 r = -EFAULT;
2018                 if (copy_from_user(&zone, argp, sizeof zone))
2019                         goto out;
2020                 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
2021                 if (r)
2022                         goto out;
2023                 r = 0;
2024                 break;
2025         }
2026         case KVM_UNREGISTER_COALESCED_MMIO: {
2027                 struct kvm_coalesced_mmio_zone zone;
2028                 r = -EFAULT;
2029                 if (copy_from_user(&zone, argp, sizeof zone))
2030                         goto out;
2031                 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
2032                 if (r)
2033                         goto out;
2034                 r = 0;
2035                 break;
2036         }
2037 #endif
2038         case KVM_IRQFD: {
2039                 struct kvm_irqfd data;
2040
2041                 r = -EFAULT;
2042                 if (copy_from_user(&data, argp, sizeof data))
2043                         goto out;
2044                 r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags);
2045                 break;
2046         }
2047         case KVM_IOEVENTFD: {
2048                 struct kvm_ioeventfd data;
2049
2050                 r = -EFAULT;
2051                 if (copy_from_user(&data, argp, sizeof data))
2052                         goto out;
2053                 r = kvm_ioeventfd(kvm, &data);
2054                 break;
2055         }
2056 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2057         case KVM_SET_BOOT_CPU_ID:
2058                 r = 0;
2059                 mutex_lock(&kvm->lock);
2060                 if (atomic_read(&kvm->online_vcpus) != 0)
2061                         r = -EBUSY;
2062                 else
2063                         kvm->bsp_vcpu_id = arg;
2064                 mutex_unlock(&kvm->lock);
2065                 break;
2066 #endif
2067         default:
2068                 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
2069                 if (r == -ENOTTY)
2070                         r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
2071         }
2072 out:
2073         return r;
2074 }
2075
2076 #ifdef CONFIG_COMPAT
2077 struct compat_kvm_dirty_log {
2078         __u32 slot;
2079         __u32 padding1;
2080         union {
2081                 compat_uptr_t dirty_bitmap; /* one bit per page */
2082                 __u64 padding2;
2083         };
2084 };
2085
2086 static long kvm_vm_compat_ioctl(struct file *filp,
2087                            unsigned int ioctl, unsigned long arg)
2088 {
2089         struct kvm *kvm = filp->private_data;
2090         int r;
2091
2092         if (kvm->mm != current->mm)
2093                 return -EIO;
2094         switch (ioctl) {
2095         case KVM_GET_DIRTY_LOG: {
2096                 struct compat_kvm_dirty_log compat_log;
2097                 struct kvm_dirty_log log;
2098
2099                 r = -EFAULT;
2100                 if (copy_from_user(&compat_log, (void __user *)arg,
2101                                    sizeof(compat_log)))
2102                         goto out;
2103                 log.slot         = compat_log.slot;
2104                 log.padding1     = compat_log.padding1;
2105                 log.padding2     = compat_log.padding2;
2106                 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
2107
2108                 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2109                 if (r)
2110                         goto out;
2111                 break;
2112         }
2113         default:
2114                 r = kvm_vm_ioctl(filp, ioctl, arg);
2115         }
2116
2117 out:
2118         return r;
2119 }
2120 #endif
2121
2122 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2123 {
2124         struct page *page[1];
2125         unsigned long addr;
2126         int npages;
2127         gfn_t gfn = vmf->pgoff;
2128         struct kvm *kvm = vma->vm_file->private_data;
2129
2130         addr = gfn_to_hva(kvm, gfn);
2131         if (kvm_is_error_hva(addr))
2132                 return VM_FAULT_SIGBUS;
2133
2134         npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
2135                                 NULL);
2136         if (unlikely(npages != 1))
2137                 return VM_FAULT_SIGBUS;
2138
2139         vmf->page = page[0];
2140         return 0;
2141 }
2142
2143 static const struct vm_operations_struct kvm_vm_vm_ops = {
2144         .fault = kvm_vm_fault,
2145 };
2146
2147 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2148 {
2149         vma->vm_ops = &kvm_vm_vm_ops;
2150         return 0;
2151 }
2152
2153 static struct file_operations kvm_vm_fops = {
2154         .release        = kvm_vm_release,
2155         .unlocked_ioctl = kvm_vm_ioctl,
2156 #ifdef CONFIG_COMPAT
2157         .compat_ioctl   = kvm_vm_compat_ioctl,
2158 #endif
2159         .mmap           = kvm_vm_mmap,
2160         .llseek         = noop_llseek,
2161 };
2162
2163 static int kvm_dev_ioctl_create_vm(void)
2164 {
2165         int r;
2166         struct kvm *kvm;
2167
2168         kvm = kvm_create_vm();
2169         if (IS_ERR(kvm))
2170                 return PTR_ERR(kvm);
2171 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2172         r = kvm_coalesced_mmio_init(kvm);
2173         if (r < 0) {
2174                 kvm_put_kvm(kvm);
2175                 return r;
2176         }
2177 #endif
2178         r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
2179         if (r < 0)
2180                 kvm_put_kvm(kvm);
2181
2182         return r;
2183 }
2184
2185 static long kvm_dev_ioctl_check_extension_generic(long arg)
2186 {
2187         switch (arg) {
2188         case KVM_CAP_USER_MEMORY:
2189         case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
2190         case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
2191 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2192         case KVM_CAP_SET_BOOT_CPU_ID:
2193 #endif
2194         case KVM_CAP_INTERNAL_ERROR_DATA:
2195                 return 1;
2196 #ifdef CONFIG_HAVE_KVM_IRQCHIP
2197         case KVM_CAP_IRQ_ROUTING:
2198                 return KVM_MAX_IRQ_ROUTES;
2199 #endif
2200         default:
2201                 break;
2202         }
2203         return kvm_dev_ioctl_check_extension(arg);
2204 }
2205
2206 static long kvm_dev_ioctl(struct file *filp,
2207                           unsigned int ioctl, unsigned long arg)
2208 {
2209         long r = -EINVAL;
2210
2211         switch (ioctl) {
2212         case KVM_GET_API_VERSION:
2213                 r = -EINVAL;
2214                 if (arg)
2215                         goto out;
2216                 r = KVM_API_VERSION;
2217                 break;
2218         case KVM_CREATE_VM:
2219                 r = -EINVAL;
2220                 if (arg)
2221                         goto out;
2222                 r = kvm_dev_ioctl_create_vm();
2223                 break;
2224         case KVM_CHECK_EXTENSION:
2225                 r = kvm_dev_ioctl_check_extension_generic(arg);
2226                 break;
2227         case KVM_GET_VCPU_MMAP_SIZE:
2228                 r = -EINVAL;
2229                 if (arg)
2230                         goto out;
2231                 r = PAGE_SIZE;     /* struct kvm_run */
2232 #ifdef CONFIG_X86
2233                 r += PAGE_SIZE;    /* pio data page */
2234 #endif
2235 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2236                 r += PAGE_SIZE;    /* coalesced mmio ring page */
2237 #endif
2238                 break;
2239         case KVM_TRACE_ENABLE:
2240         case KVM_TRACE_PAUSE:
2241         case KVM_TRACE_DISABLE:
2242                 r = -EOPNOTSUPP;
2243                 break;
2244         default:
2245                 return kvm_arch_dev_ioctl(filp, ioctl, arg);
2246         }
2247 out:
2248         return r;
2249 }
2250
2251 static struct file_operations kvm_chardev_ops = {
2252         .unlocked_ioctl = kvm_dev_ioctl,
2253         .compat_ioctl   = kvm_dev_ioctl,
2254         .llseek         = noop_llseek,
2255 };
2256
2257 static struct miscdevice kvm_dev = {
2258         KVM_MINOR,
2259         "kvm",
2260         &kvm_chardev_ops,
2261 };
2262
2263 static void hardware_enable_nolock(void *junk)
2264 {
2265         int cpu = raw_smp_processor_id();
2266         int r;
2267
2268         if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
2269                 return;
2270
2271         cpumask_set_cpu(cpu, cpus_hardware_enabled);
2272
2273         r = kvm_arch_hardware_enable(NULL);
2274
2275         if (r) {
2276                 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2277                 atomic_inc(&hardware_enable_failed);
2278                 printk(KERN_INFO "kvm: enabling virtualization on "
2279                                  "CPU%d failed\n", cpu);
2280         }
2281 }
2282
2283 static void hardware_enable(void *junk)
2284 {
2285         raw_spin_lock(&kvm_lock);
2286         hardware_enable_nolock(junk);
2287         raw_spin_unlock(&kvm_lock);
2288 }
2289
2290 static void hardware_disable_nolock(void *junk)
2291 {
2292         int cpu = raw_smp_processor_id();
2293
2294         if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
2295                 return;
2296         cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2297         kvm_arch_hardware_disable(NULL);
2298 }
2299
2300 static void hardware_disable(void *junk)
2301 {
2302         raw_spin_lock(&kvm_lock);
2303         hardware_disable_nolock(junk);
2304         raw_spin_unlock(&kvm_lock);
2305 }
2306
2307 static void hardware_disable_all_nolock(void)
2308 {
2309         BUG_ON(!kvm_usage_count);
2310
2311         kvm_usage_count--;
2312         if (!kvm_usage_count)
2313                 on_each_cpu(hardware_disable_nolock, NULL, 1);
2314 }
2315
2316 static void hardware_disable_all(void)
2317 {
2318         raw_spin_lock(&kvm_lock);
2319         hardware_disable_all_nolock();
2320         raw_spin_unlock(&kvm_lock);
2321 }
2322
2323 static int hardware_enable_all(void)
2324 {
2325         int r = 0;
2326
2327         raw_spin_lock(&kvm_lock);
2328
2329         kvm_usage_count++;
2330         if (kvm_usage_count == 1) {
2331                 atomic_set(&hardware_enable_failed, 0);
2332                 on_each_cpu(hardware_enable_nolock, NULL, 1);
2333
2334                 if (atomic_read(&hardware_enable_failed)) {
2335                         hardware_disable_all_nolock();
2336                         r = -EBUSY;
2337                 }
2338         }
2339
2340         raw_spin_unlock(&kvm_lock);
2341
2342         return r;
2343 }
2344
2345 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2346                            void *v)
2347 {
2348         int cpu = (long)v;
2349
2350         if (!kvm_usage_count)
2351                 return NOTIFY_OK;
2352
2353         val &= ~CPU_TASKS_FROZEN;
2354         switch (val) {
2355         case CPU_DYING:
2356                 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2357                        cpu);
2358                 hardware_disable(NULL);
2359                 break;
2360         case CPU_STARTING:
2361                 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2362                        cpu);
2363                 hardware_enable(NULL);
2364                 break;
2365         }
2366         return NOTIFY_OK;
2367 }
2368
2369
2370 asmlinkage void kvm_spurious_fault(void)
2371 {
2372         /* Fault while not rebooting.  We want the trace. */
2373         BUG();
2374 }
2375 EXPORT_SYMBOL_GPL(kvm_spurious_fault);
2376
2377 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2378                       void *v)
2379 {
2380         /*
2381          * Some (well, at least mine) BIOSes hang on reboot if
2382          * in vmx root mode.
2383          *
2384          * And Intel TXT required VMX off for all cpu when system shutdown.
2385          */
2386         printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2387         kvm_rebooting = true;
2388         on_each_cpu(hardware_disable_nolock, NULL, 1);
2389         return NOTIFY_OK;
2390 }
2391
2392 static struct notifier_block kvm_reboot_notifier = {
2393         .notifier_call = kvm_reboot,
2394         .priority = 0,
2395 };
2396
2397 static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
2398 {
2399         int i;
2400
2401         for (i = 0; i < bus->dev_count; i++) {
2402                 struct kvm_io_device *pos = bus->range[i].dev;
2403
2404                 kvm_iodevice_destructor(pos);
2405         }
2406         kfree(bus);
2407 }
2408
2409 int kvm_io_bus_sort_cmp(const void *p1, const void *p2)
2410 {
2411         const struct kvm_io_range *r1 = p1;
2412         const struct kvm_io_range *r2 = p2;
2413
2414         if (r1->addr < r2->addr)
2415                 return -1;
2416         if (r1->addr + r1->len > r2->addr + r2->len)
2417                 return 1;
2418         return 0;
2419 }
2420
2421 int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev,
2422                           gpa_t addr, int len)
2423 {
2424         if (bus->dev_count == NR_IOBUS_DEVS)
2425                 return -ENOSPC;
2426
2427         bus->range[bus->dev_count++] = (struct kvm_io_range) {
2428                 .addr = addr,
2429                 .len = len,
2430                 .dev = dev,
2431         };
2432
2433         sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range),
2434                 kvm_io_bus_sort_cmp, NULL);
2435
2436         return 0;
2437 }
2438
2439 int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus,
2440                              gpa_t addr, int len)
2441 {
2442         struct kvm_io_range *range, key;
2443         int off;
2444
2445         key = (struct kvm_io_range) {
2446                 .addr = addr,
2447                 .len = len,
2448         };
2449
2450         range = bsearch(&key, bus->range, bus->dev_count,
2451                         sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp);
2452         if (range == NULL)
2453                 return -ENOENT;
2454
2455         off = range - bus->range;
2456
2457         while (off > 0 && kvm_io_bus_sort_cmp(&key, &bus->range[off-1]) == 0)
2458                 off--;
2459
2460         return off;
2461 }
2462
2463 /* kvm_io_bus_write - called under kvm->slots_lock */
2464 int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2465                      int len, const void *val)
2466 {
2467         int idx;
2468         struct kvm_io_bus *bus;
2469         struct kvm_io_range range;
2470
2471         range = (struct kvm_io_range) {
2472                 .addr = addr,
2473                 .len = len,
2474         };
2475
2476         bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2477         idx = kvm_io_bus_get_first_dev(bus, addr, len);
2478         if (idx < 0)
2479                 return -EOPNOTSUPP;
2480
2481         while (idx < bus->dev_count &&
2482                 kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) {
2483                 if (!kvm_iodevice_write(bus->range[idx].dev, addr, len, val))
2484                         return 0;
2485                 idx++;
2486         }
2487
2488         return -EOPNOTSUPP;
2489 }
2490
2491 /* kvm_io_bus_read - called under kvm->slots_lock */
2492 int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2493                     int len, void *val)
2494 {
2495         int idx;
2496         struct kvm_io_bus *bus;
2497         struct kvm_io_range range;
2498
2499         range = (struct kvm_io_range) {
2500                 .addr = addr,
2501                 .len = len,
2502         };
2503
2504         bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2505         idx = kvm_io_bus_get_first_dev(bus, addr, len);
2506         if (idx < 0)
2507                 return -EOPNOTSUPP;
2508
2509         while (idx < bus->dev_count &&
2510                 kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) {
2511                 if (!kvm_iodevice_read(bus->range[idx].dev, addr, len, val))
2512                         return 0;
2513                 idx++;
2514         }
2515
2516         return -EOPNOTSUPP;
2517 }
2518
2519 /* Caller must hold slots_lock. */
2520 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2521                             int len, struct kvm_io_device *dev)
2522 {
2523         struct kvm_io_bus *new_bus, *bus;
2524
2525         bus = kvm->buses[bus_idx];
2526         if (bus->dev_count > NR_IOBUS_DEVS-1)
2527                 return -ENOSPC;
2528
2529         new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL);
2530         if (!new_bus)
2531                 return -ENOMEM;
2532         memcpy(new_bus, bus, sizeof(struct kvm_io_bus));
2533         kvm_io_bus_insert_dev(new_bus, dev, addr, len);
2534         rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2535         synchronize_srcu_expedited(&kvm->srcu);
2536         kfree(bus);
2537
2538         return 0;
2539 }
2540
2541 /* Caller must hold slots_lock. */
2542 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2543                               struct kvm_io_device *dev)
2544 {
2545         int i, r;
2546         struct kvm_io_bus *new_bus, *bus;
2547
2548         new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL);
2549         if (!new_bus)
2550                 return -ENOMEM;
2551
2552         bus = kvm->buses[bus_idx];
2553         memcpy(new_bus, bus, sizeof(struct kvm_io_bus));
2554
2555         r = -ENOENT;
2556         for (i = 0; i < new_bus->dev_count; i++)
2557                 if (new_bus->range[i].dev == dev) {
2558                         r = 0;
2559                         new_bus->dev_count--;
2560                         new_bus->range[i] = new_bus->range[new_bus->dev_count];
2561                         sort(new_bus->range, new_bus->dev_count,
2562                              sizeof(struct kvm_io_range),
2563                              kvm_io_bus_sort_cmp, NULL);
2564                         break;
2565                 }
2566
2567         if (r) {
2568                 kfree(new_bus);
2569                 return r;
2570         }
2571
2572         rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2573         synchronize_srcu_expedited(&kvm->srcu);
2574         kfree(bus);
2575         return r;
2576 }
2577
2578 static struct notifier_block kvm_cpu_notifier = {
2579         .notifier_call = kvm_cpu_hotplug,
2580 };
2581
2582 static int vm_stat_get(void *_offset, u64 *val)
2583 {
2584         unsigned offset = (long)_offset;
2585         struct kvm *kvm;
2586
2587         *val = 0;
2588         raw_spin_lock(&kvm_lock);
2589         list_for_each_entry(kvm, &vm_list, vm_list)
2590                 *val += *(u32 *)((void *)kvm + offset);
2591         raw_spin_unlock(&kvm_lock);
2592         return 0;
2593 }
2594
2595 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
2596
2597 static int vcpu_stat_get(void *_offset, u64 *val)
2598 {
2599         unsigned offset = (long)_offset;
2600         struct kvm *kvm;
2601         struct kvm_vcpu *vcpu;
2602         int i;
2603
2604         *val = 0;
2605         raw_spin_lock(&kvm_lock);
2606         list_for_each_entry(kvm, &vm_list, vm_list)
2607                 kvm_for_each_vcpu(i, vcpu, kvm)
2608                         *val += *(u32 *)((void *)vcpu + offset);
2609
2610         raw_spin_unlock(&kvm_lock);
2611         return 0;
2612 }
2613
2614 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
2615
2616 static const struct file_operations *stat_fops[] = {
2617         [KVM_STAT_VCPU] = &vcpu_stat_fops,
2618         [KVM_STAT_VM]   = &vm_stat_fops,
2619 };
2620
2621 static void kvm_init_debug(void)
2622 {
2623         struct kvm_stats_debugfs_item *p;
2624
2625         kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
2626         for (p = debugfs_entries; p->name; ++p)
2627                 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
2628                                                 (void *)(long)p->offset,
2629                                                 stat_fops[p->kind]);
2630 }
2631
2632 static void kvm_exit_debug(void)
2633 {
2634         struct kvm_stats_debugfs_item *p;
2635
2636         for (p = debugfs_entries; p->name; ++p)
2637                 debugfs_remove(p->dentry);
2638         debugfs_remove(kvm_debugfs_dir);
2639 }
2640
2641 static int kvm_suspend(void)
2642 {
2643         if (kvm_usage_count)
2644                 hardware_disable_nolock(NULL);
2645         return 0;
2646 }
2647
2648 static void kvm_resume(void)
2649 {
2650         if (kvm_usage_count) {
2651                 WARN_ON(raw_spin_is_locked(&kvm_lock));
2652                 hardware_enable_nolock(NULL);
2653         }
2654 }
2655
2656 static struct syscore_ops kvm_syscore_ops = {
2657         .suspend = kvm_suspend,
2658         .resume = kvm_resume,
2659 };
2660
2661 struct page *bad_page;
2662 pfn_t bad_pfn;
2663
2664 static inline
2665 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
2666 {
2667         return container_of(pn, struct kvm_vcpu, preempt_notifier);
2668 }
2669
2670 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
2671 {
2672         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2673
2674         kvm_arch_vcpu_load(vcpu, cpu);
2675 }
2676
2677 static void kvm_sched_out(struct preempt_notifier *pn,
2678                           struct task_struct *next)
2679 {
2680         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2681
2682         kvm_arch_vcpu_put(vcpu);
2683 }
2684
2685 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
2686                   struct module *module)
2687 {
2688         int r;
2689         int cpu;
2690
2691         r = kvm_arch_init(opaque);
2692         if (r)
2693                 goto out_fail;
2694
2695         bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2696
2697         if (bad_page == NULL) {
2698                 r = -ENOMEM;
2699                 goto out;
2700         }
2701
2702         bad_pfn = page_to_pfn(bad_page);
2703
2704         hwpoison_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2705
2706         if (hwpoison_page == NULL) {
2707                 r = -ENOMEM;
2708                 goto out_free_0;
2709         }
2710
2711         hwpoison_pfn = page_to_pfn(hwpoison_page);
2712
2713         fault_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2714
2715         if (fault_page == NULL) {
2716                 r = -ENOMEM;
2717                 goto out_free_0;
2718         }
2719
2720         fault_pfn = page_to_pfn(fault_page);
2721
2722         if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
2723                 r = -ENOMEM;
2724                 goto out_free_0;
2725         }
2726
2727         r = kvm_arch_hardware_setup();
2728         if (r < 0)
2729                 goto out_free_0a;
2730
2731         for_each_online_cpu(cpu) {
2732                 smp_call_function_single(cpu,
2733                                 kvm_arch_check_processor_compat,
2734                                 &r, 1);
2735                 if (r < 0)
2736                         goto out_free_1;
2737         }
2738
2739         r = register_cpu_notifier(&kvm_cpu_notifier);
2740         if (r)
2741                 goto out_free_2;
2742         register_reboot_notifier(&kvm_reboot_notifier);
2743
2744         /* A kmem cache lets us meet the alignment requirements of fx_save. */
2745         if (!vcpu_align)
2746                 vcpu_align = __alignof__(struct kvm_vcpu);
2747         kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
2748                                            0, NULL);
2749         if (!kvm_vcpu_cache) {
2750                 r = -ENOMEM;
2751                 goto out_free_3;
2752         }
2753
2754         r = kvm_async_pf_init();
2755         if (r)
2756                 goto out_free;
2757
2758         kvm_chardev_ops.owner = module;
2759         kvm_vm_fops.owner = module;
2760         kvm_vcpu_fops.owner = module;
2761
2762         r = misc_register(&kvm_dev);
2763         if (r) {
2764                 printk(KERN_ERR "kvm: misc device register failed\n");
2765                 goto out_unreg;
2766         }
2767
2768         register_syscore_ops(&kvm_syscore_ops);
2769
2770         kvm_preempt_ops.sched_in = kvm_sched_in;
2771         kvm_preempt_ops.sched_out = kvm_sched_out;
2772
2773         kvm_init_debug();
2774
2775         return 0;
2776
2777 out_unreg:
2778         kvm_async_pf_deinit();
2779 out_free:
2780         kmem_cache_destroy(kvm_vcpu_cache);
2781 out_free_3:
2782         unregister_reboot_notifier(&kvm_reboot_notifier);
2783         unregister_cpu_notifier(&kvm_cpu_notifier);
2784 out_free_2:
2785 out_free_1:
2786         kvm_arch_hardware_unsetup();
2787 out_free_0a:
2788         free_cpumask_var(cpus_hardware_enabled);
2789 out_free_0:
2790         if (fault_page)
2791                 __free_page(fault_page);
2792         if (hwpoison_page)
2793                 __free_page(hwpoison_page);
2794         __free_page(bad_page);
2795 out:
2796         kvm_arch_exit();
2797 out_fail:
2798         return r;
2799 }
2800 EXPORT_SYMBOL_GPL(kvm_init);
2801
2802 void kvm_exit(void)
2803 {
2804         kvm_exit_debug();
2805         misc_deregister(&kvm_dev);
2806         kmem_cache_destroy(kvm_vcpu_cache);
2807         kvm_async_pf_deinit();
2808         unregister_syscore_ops(&kvm_syscore_ops);
2809         unregister_reboot_notifier(&kvm_reboot_notifier);
2810         unregister_cpu_notifier(&kvm_cpu_notifier);
2811         on_each_cpu(hardware_disable_nolock, NULL, 1);
2812         kvm_arch_hardware_unsetup();
2813         kvm_arch_exit();
2814         free_cpumask_var(cpus_hardware_enabled);
2815         __free_page(hwpoison_page);
2816         __free_page(bad_page);
2817 }
2818 EXPORT_SYMBOL_GPL(kvm_exit);