2 * Kernel-based Virtual Machine driver for Linux
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
7 * Copyright (C) 2006 Qumranet, Inc.
8 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
11 * Avi Kivity <avi@qumranet.com>
12 * Yaniv Kamay <yaniv@qumranet.com>
14 * This work is licensed under the terms of the GNU GPL, version 2. See
15 * the COPYING file in the top-level directory.
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>
27 #include <linux/miscdevice.h>
28 #include <linux/vmalloc.h>
29 #include <linux/reboot.h>
30 #include <linux/debugfs.h>
31 #include <linux/highmem.h>
32 #include <linux/file.h>
33 #include <linux/sysdev.h>
34 #include <linux/cpu.h>
35 #include <linux/sched.h>
36 #include <linux/cpumask.h>
37 #include <linux/smp.h>
38 #include <linux/anon_inodes.h>
39 #include <linux/profile.h>
40 #include <linux/kvm_para.h>
41 #include <linux/pagemap.h>
42 #include <linux/mman.h>
43 #include <linux/swap.h>
44 #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>
51 #include <asm/processor.h>
53 #include <asm/uaccess.h>
54 #include <asm/pgtable.h>
55 #include <asm-generic/bitops/le.h>
57 #include "coalesced_mmio.h"
60 #define CREATE_TRACE_POINTS
61 #include <trace/events/kvm.h>
63 MODULE_AUTHOR("Qumranet");
64 MODULE_LICENSE("GPL");
69 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
72 DEFINE_SPINLOCK(kvm_lock);
75 static cpumask_var_t cpus_hardware_enabled;
76 static int kvm_usage_count = 0;
77 static atomic_t hardware_enable_failed;
79 struct kmem_cache *kvm_vcpu_cache;
80 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
82 static __read_mostly struct preempt_ops kvm_preempt_ops;
84 struct dentry *kvm_debugfs_dir;
86 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
88 static int hardware_enable_all(void);
89 static void hardware_disable_all(void);
91 static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
93 static bool kvm_rebooting;
95 static bool largepages_enabled = true;
97 static struct page *hwpoison_page;
98 static pfn_t hwpoison_pfn;
100 static struct page *fault_page;
101 static pfn_t fault_pfn;
103 inline int kvm_is_mmio_pfn(pfn_t pfn)
105 if (pfn_valid(pfn)) {
106 struct page *page = compound_head(pfn_to_page(pfn));
107 return PageReserved(page);
114 * Switches to specified vcpu, until a matching vcpu_put()
116 void vcpu_load(struct kvm_vcpu *vcpu)
120 mutex_lock(&vcpu->mutex);
122 preempt_notifier_register(&vcpu->preempt_notifier);
123 kvm_arch_vcpu_load(vcpu, cpu);
127 void vcpu_put(struct kvm_vcpu *vcpu)
130 kvm_arch_vcpu_put(vcpu);
131 preempt_notifier_unregister(&vcpu->preempt_notifier);
133 mutex_unlock(&vcpu->mutex);
136 static void ack_flush(void *_completed)
140 static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
145 struct kvm_vcpu *vcpu;
147 zalloc_cpumask_var(&cpus, GFP_ATOMIC);
149 raw_spin_lock(&kvm->requests_lock);
150 me = smp_processor_id();
151 kvm_for_each_vcpu(i, vcpu, kvm) {
152 if (kvm_make_check_request(req, vcpu))
155 if (cpus != NULL && cpu != -1 && cpu != me)
156 cpumask_set_cpu(cpu, cpus);
158 if (unlikely(cpus == NULL))
159 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
160 else if (!cpumask_empty(cpus))
161 smp_call_function_many(cpus, ack_flush, NULL, 1);
164 raw_spin_unlock(&kvm->requests_lock);
165 free_cpumask_var(cpus);
169 void kvm_flush_remote_tlbs(struct kvm *kvm)
171 int dirty_count = kvm->tlbs_dirty;
174 if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
175 ++kvm->stat.remote_tlb_flush;
176 cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
179 void kvm_reload_remote_mmus(struct kvm *kvm)
181 make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
184 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
189 mutex_init(&vcpu->mutex);
193 init_waitqueue_head(&vcpu->wq);
194 kvm_async_pf_vcpu_init(vcpu);
196 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
201 vcpu->run = page_address(page);
203 r = kvm_arch_vcpu_init(vcpu);
209 free_page((unsigned long)vcpu->run);
213 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
215 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
217 kvm_arch_vcpu_uninit(vcpu);
218 free_page((unsigned long)vcpu->run);
220 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
222 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
223 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
225 return container_of(mn, struct kvm, mmu_notifier);
228 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
229 struct mm_struct *mm,
230 unsigned long address)
232 struct kvm *kvm = mmu_notifier_to_kvm(mn);
233 int need_tlb_flush, idx;
236 * When ->invalidate_page runs, the linux pte has been zapped
237 * already but the page is still allocated until
238 * ->invalidate_page returns. So if we increase the sequence
239 * here the kvm page fault will notice if the spte can't be
240 * established because the page is going to be freed. If
241 * instead the kvm page fault establishes the spte before
242 * ->invalidate_page runs, kvm_unmap_hva will release it
245 * The sequence increase only need to be seen at spin_unlock
246 * time, and not at spin_lock time.
248 * Increasing the sequence after the spin_unlock would be
249 * unsafe because the kvm page fault could then establish the
250 * pte after kvm_unmap_hva returned, without noticing the page
251 * is going to be freed.
253 idx = srcu_read_lock(&kvm->srcu);
254 spin_lock(&kvm->mmu_lock);
255 kvm->mmu_notifier_seq++;
256 need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty;
257 spin_unlock(&kvm->mmu_lock);
258 srcu_read_unlock(&kvm->srcu, idx);
260 /* we've to flush the tlb before the pages can be freed */
262 kvm_flush_remote_tlbs(kvm);
266 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
267 struct mm_struct *mm,
268 unsigned long address,
271 struct kvm *kvm = mmu_notifier_to_kvm(mn);
274 idx = srcu_read_lock(&kvm->srcu);
275 spin_lock(&kvm->mmu_lock);
276 kvm->mmu_notifier_seq++;
277 kvm_set_spte_hva(kvm, address, pte);
278 spin_unlock(&kvm->mmu_lock);
279 srcu_read_unlock(&kvm->srcu, idx);
282 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
283 struct mm_struct *mm,
287 struct kvm *kvm = mmu_notifier_to_kvm(mn);
288 int need_tlb_flush = 0, idx;
290 idx = srcu_read_lock(&kvm->srcu);
291 spin_lock(&kvm->mmu_lock);
293 * The count increase must become visible at unlock time as no
294 * spte can be established without taking the mmu_lock and
295 * count is also read inside the mmu_lock critical section.
297 kvm->mmu_notifier_count++;
298 for (; start < end; start += PAGE_SIZE)
299 need_tlb_flush |= kvm_unmap_hva(kvm, start);
300 need_tlb_flush |= kvm->tlbs_dirty;
301 spin_unlock(&kvm->mmu_lock);
302 srcu_read_unlock(&kvm->srcu, idx);
304 /* we've to flush the tlb before the pages can be freed */
306 kvm_flush_remote_tlbs(kvm);
309 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
310 struct mm_struct *mm,
314 struct kvm *kvm = mmu_notifier_to_kvm(mn);
316 spin_lock(&kvm->mmu_lock);
318 * This sequence increase will notify the kvm page fault that
319 * the page that is going to be mapped in the spte could have
322 kvm->mmu_notifier_seq++;
324 * The above sequence increase must be visible before the
325 * below count decrease but both values are read by the kvm
326 * page fault under mmu_lock spinlock so we don't need to add
327 * a smb_wmb() here in between the two.
329 kvm->mmu_notifier_count--;
330 spin_unlock(&kvm->mmu_lock);
332 BUG_ON(kvm->mmu_notifier_count < 0);
335 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
336 struct mm_struct *mm,
337 unsigned long address)
339 struct kvm *kvm = mmu_notifier_to_kvm(mn);
342 idx = srcu_read_lock(&kvm->srcu);
343 spin_lock(&kvm->mmu_lock);
344 young = kvm_age_hva(kvm, address);
345 spin_unlock(&kvm->mmu_lock);
346 srcu_read_unlock(&kvm->srcu, idx);
349 kvm_flush_remote_tlbs(kvm);
354 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
355 struct mm_struct *mm)
357 struct kvm *kvm = mmu_notifier_to_kvm(mn);
360 idx = srcu_read_lock(&kvm->srcu);
361 kvm_arch_flush_shadow(kvm);
362 srcu_read_unlock(&kvm->srcu, idx);
365 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
366 .invalidate_page = kvm_mmu_notifier_invalidate_page,
367 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
368 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
369 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
370 .change_pte = kvm_mmu_notifier_change_pte,
371 .release = kvm_mmu_notifier_release,
374 static int kvm_init_mmu_notifier(struct kvm *kvm)
376 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
377 return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
380 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
382 static int kvm_init_mmu_notifier(struct kvm *kvm)
387 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
389 static struct kvm *kvm_create_vm(void)
392 struct kvm *kvm = kvm_arch_alloc_vm();
395 return ERR_PTR(-ENOMEM);
397 r = kvm_arch_init_vm(kvm);
399 goto out_err_nodisable;
401 r = hardware_enable_all();
403 goto out_err_nodisable;
405 #ifdef CONFIG_HAVE_KVM_IRQCHIP
406 INIT_HLIST_HEAD(&kvm->mask_notifier_list);
407 INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
411 kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
414 if (init_srcu_struct(&kvm->srcu))
416 for (i = 0; i < KVM_NR_BUSES; i++) {
417 kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus),
423 r = kvm_init_mmu_notifier(kvm);
427 kvm->mm = current->mm;
428 atomic_inc(&kvm->mm->mm_count);
429 spin_lock_init(&kvm->mmu_lock);
430 raw_spin_lock_init(&kvm->requests_lock);
431 kvm_eventfd_init(kvm);
432 mutex_init(&kvm->lock);
433 mutex_init(&kvm->irq_lock);
434 mutex_init(&kvm->slots_lock);
435 atomic_set(&kvm->users_count, 1);
436 spin_lock(&kvm_lock);
437 list_add(&kvm->vm_list, &vm_list);
438 spin_unlock(&kvm_lock);
443 cleanup_srcu_struct(&kvm->srcu);
445 hardware_disable_all();
447 for (i = 0; i < KVM_NR_BUSES; i++)
448 kfree(kvm->buses[i]);
449 kfree(kvm->memslots);
450 kvm_arch_free_vm(kvm);
454 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
456 if (!memslot->dirty_bitmap)
459 if (2 * kvm_dirty_bitmap_bytes(memslot) > PAGE_SIZE)
460 vfree(memslot->dirty_bitmap_head);
462 kfree(memslot->dirty_bitmap_head);
464 memslot->dirty_bitmap = NULL;
465 memslot->dirty_bitmap_head = NULL;
469 * Free any memory in @free but not in @dont.
471 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
472 struct kvm_memory_slot *dont)
476 if (!dont || free->rmap != dont->rmap)
479 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
480 kvm_destroy_dirty_bitmap(free);
483 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
484 if (!dont || free->lpage_info[i] != dont->lpage_info[i]) {
485 vfree(free->lpage_info[i]);
486 free->lpage_info[i] = NULL;
494 void kvm_free_physmem(struct kvm *kvm)
497 struct kvm_memslots *slots = kvm->memslots;
499 for (i = 0; i < slots->nmemslots; ++i)
500 kvm_free_physmem_slot(&slots->memslots[i], NULL);
502 kfree(kvm->memslots);
505 static void kvm_destroy_vm(struct kvm *kvm)
508 struct mm_struct *mm = kvm->mm;
510 kvm_arch_sync_events(kvm);
511 spin_lock(&kvm_lock);
512 list_del(&kvm->vm_list);
513 spin_unlock(&kvm_lock);
514 kvm_free_irq_routing(kvm);
515 for (i = 0; i < KVM_NR_BUSES; i++)
516 kvm_io_bus_destroy(kvm->buses[i]);
517 kvm_coalesced_mmio_free(kvm);
518 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
519 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
521 kvm_arch_flush_shadow(kvm);
523 kvm_arch_destroy_vm(kvm);
524 kvm_free_physmem(kvm);
525 cleanup_srcu_struct(&kvm->srcu);
526 kvm_arch_free_vm(kvm);
527 hardware_disable_all();
531 void kvm_get_kvm(struct kvm *kvm)
533 atomic_inc(&kvm->users_count);
535 EXPORT_SYMBOL_GPL(kvm_get_kvm);
537 void kvm_put_kvm(struct kvm *kvm)
539 if (atomic_dec_and_test(&kvm->users_count))
542 EXPORT_SYMBOL_GPL(kvm_put_kvm);
545 static int kvm_vm_release(struct inode *inode, struct file *filp)
547 struct kvm *kvm = filp->private_data;
549 kvm_irqfd_release(kvm);
556 * Allocation size is twice as large as the actual dirty bitmap size.
557 * This makes it possible to do double buffering: see x86's
558 * kvm_vm_ioctl_get_dirty_log().
560 static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
562 unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
564 if (dirty_bytes > PAGE_SIZE)
565 memslot->dirty_bitmap = vzalloc(dirty_bytes);
567 memslot->dirty_bitmap = kzalloc(dirty_bytes, GFP_KERNEL);
569 if (!memslot->dirty_bitmap)
572 memslot->dirty_bitmap_head = memslot->dirty_bitmap;
577 * Allocate some memory and give it an address in the guest physical address
580 * Discontiguous memory is allowed, mostly for framebuffers.
582 * Must be called holding mmap_sem for write.
584 int __kvm_set_memory_region(struct kvm *kvm,
585 struct kvm_userspace_memory_region *mem,
588 int r, flush_shadow = 0;
590 unsigned long npages;
592 struct kvm_memory_slot *memslot;
593 struct kvm_memory_slot old, new;
594 struct kvm_memslots *slots, *old_memslots;
597 /* General sanity checks */
598 if (mem->memory_size & (PAGE_SIZE - 1))
600 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
602 if (user_alloc && (mem->userspace_addr & (PAGE_SIZE - 1)))
604 if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
606 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
609 memslot = &kvm->memslots->memslots[mem->slot];
610 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
611 npages = mem->memory_size >> PAGE_SHIFT;
614 if (npages > KVM_MEM_MAX_NR_PAGES)
618 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
620 new = old = *memslot;
623 new.base_gfn = base_gfn;
625 new.flags = mem->flags;
627 /* Disallow changing a memory slot's size. */
629 if (npages && old.npages && npages != old.npages)
632 /* Check for overlaps */
634 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
635 struct kvm_memory_slot *s = &kvm->memslots->memslots[i];
637 if (s == memslot || !s->npages)
639 if (!((base_gfn + npages <= s->base_gfn) ||
640 (base_gfn >= s->base_gfn + s->npages)))
644 /* Free page dirty bitmap if unneeded */
645 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
646 new.dirty_bitmap = NULL;
650 /* Allocate if a slot is being created */
652 if (npages && !new.rmap) {
653 new.rmap = vzalloc(npages * sizeof(*new.rmap));
658 new.user_alloc = user_alloc;
659 new.userspace_addr = mem->userspace_addr;
664 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
670 /* Avoid unused variable warning if no large pages */
673 if (new.lpage_info[i])
676 lpages = 1 + ((base_gfn + npages - 1)
677 >> KVM_HPAGE_GFN_SHIFT(level));
678 lpages -= base_gfn >> KVM_HPAGE_GFN_SHIFT(level);
680 new.lpage_info[i] = vzalloc(lpages * sizeof(*new.lpage_info[i]));
682 if (!new.lpage_info[i])
685 if (base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1))
686 new.lpage_info[i][0].write_count = 1;
687 if ((base_gfn+npages) & (KVM_PAGES_PER_HPAGE(level) - 1))
688 new.lpage_info[i][lpages - 1].write_count = 1;
689 ugfn = new.userspace_addr >> PAGE_SHIFT;
691 * If the gfn and userspace address are not aligned wrt each
692 * other, or if explicitly asked to, disable large page
693 * support for this slot
695 if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
697 for (j = 0; j < lpages; ++j)
698 new.lpage_info[i][j].write_count = 1;
703 /* Allocate page dirty bitmap if needed */
704 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
705 if (kvm_create_dirty_bitmap(&new) < 0)
707 /* destroy any largepage mappings for dirty tracking */
711 #else /* not defined CONFIG_S390 */
712 new.user_alloc = user_alloc;
714 new.userspace_addr = mem->userspace_addr;
715 #endif /* not defined CONFIG_S390 */
719 slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
722 memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
723 if (mem->slot >= slots->nmemslots)
724 slots->nmemslots = mem->slot + 1;
726 slots->memslots[mem->slot].flags |= KVM_MEMSLOT_INVALID;
728 old_memslots = kvm->memslots;
729 rcu_assign_pointer(kvm->memslots, slots);
730 synchronize_srcu_expedited(&kvm->srcu);
731 /* From this point no new shadow pages pointing to a deleted
732 * memslot will be created.
734 * validation of sp->gfn happens in:
735 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
736 * - kvm_is_visible_gfn (mmu_check_roots)
738 kvm_arch_flush_shadow(kvm);
742 r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc);
746 /* map the pages in iommu page table */
748 r = kvm_iommu_map_pages(kvm, &new);
754 slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
757 memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
758 if (mem->slot >= slots->nmemslots)
759 slots->nmemslots = mem->slot + 1;
762 /* actual memory is freed via old in kvm_free_physmem_slot below */
765 new.dirty_bitmap = NULL;
766 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i)
767 new.lpage_info[i] = NULL;
770 slots->memslots[mem->slot] = new;
771 old_memslots = kvm->memslots;
772 rcu_assign_pointer(kvm->memslots, slots);
773 synchronize_srcu_expedited(&kvm->srcu);
775 kvm_arch_commit_memory_region(kvm, mem, old, user_alloc);
777 kvm_free_physmem_slot(&old, &new);
781 kvm_arch_flush_shadow(kvm);
786 kvm_free_physmem_slot(&new, &old);
791 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
793 int kvm_set_memory_region(struct kvm *kvm,
794 struct kvm_userspace_memory_region *mem,
799 mutex_lock(&kvm->slots_lock);
800 r = __kvm_set_memory_region(kvm, mem, user_alloc);
801 mutex_unlock(&kvm->slots_lock);
804 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
806 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
808 kvm_userspace_memory_region *mem,
811 if (mem->slot >= KVM_MEMORY_SLOTS)
813 return kvm_set_memory_region(kvm, mem, user_alloc);
816 int kvm_get_dirty_log(struct kvm *kvm,
817 struct kvm_dirty_log *log, int *is_dirty)
819 struct kvm_memory_slot *memslot;
822 unsigned long any = 0;
825 if (log->slot >= KVM_MEMORY_SLOTS)
828 memslot = &kvm->memslots->memslots[log->slot];
830 if (!memslot->dirty_bitmap)
833 n = kvm_dirty_bitmap_bytes(memslot);
835 for (i = 0; !any && i < n/sizeof(long); ++i)
836 any = memslot->dirty_bitmap[i];
839 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
850 void kvm_disable_largepages(void)
852 largepages_enabled = false;
854 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
856 int is_error_page(struct page *page)
858 return page == bad_page || page == hwpoison_page || page == fault_page;
860 EXPORT_SYMBOL_GPL(is_error_page);
862 int is_error_pfn(pfn_t pfn)
864 return pfn == bad_pfn || pfn == hwpoison_pfn || pfn == fault_pfn;
866 EXPORT_SYMBOL_GPL(is_error_pfn);
868 int is_hwpoison_pfn(pfn_t pfn)
870 return pfn == hwpoison_pfn;
872 EXPORT_SYMBOL_GPL(is_hwpoison_pfn);
874 int is_fault_pfn(pfn_t pfn)
876 return pfn == fault_pfn;
878 EXPORT_SYMBOL_GPL(is_fault_pfn);
880 static inline unsigned long bad_hva(void)
885 int kvm_is_error_hva(unsigned long addr)
887 return addr == bad_hva();
889 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
891 static struct kvm_memory_slot *__gfn_to_memslot(struct kvm_memslots *slots,
896 for (i = 0; i < slots->nmemslots; ++i) {
897 struct kvm_memory_slot *memslot = &slots->memslots[i];
899 if (gfn >= memslot->base_gfn
900 && gfn < memslot->base_gfn + memslot->npages)
906 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
908 return __gfn_to_memslot(kvm_memslots(kvm), gfn);
910 EXPORT_SYMBOL_GPL(gfn_to_memslot);
912 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
915 struct kvm_memslots *slots = kvm_memslots(kvm);
917 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
918 struct kvm_memory_slot *memslot = &slots->memslots[i];
920 if (memslot->flags & KVM_MEMSLOT_INVALID)
923 if (gfn >= memslot->base_gfn
924 && gfn < memslot->base_gfn + memslot->npages)
929 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
931 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
933 struct vm_area_struct *vma;
934 unsigned long addr, size;
938 addr = gfn_to_hva(kvm, gfn);
939 if (kvm_is_error_hva(addr))
942 down_read(¤t->mm->mmap_sem);
943 vma = find_vma(current->mm, addr);
947 size = vma_kernel_pagesize(vma);
950 up_read(¤t->mm->mmap_sem);
955 int memslot_id(struct kvm *kvm, gfn_t gfn)
958 struct kvm_memslots *slots = kvm_memslots(kvm);
959 struct kvm_memory_slot *memslot = NULL;
961 for (i = 0; i < slots->nmemslots; ++i) {
962 memslot = &slots->memslots[i];
964 if (gfn >= memslot->base_gfn
965 && gfn < memslot->base_gfn + memslot->npages)
969 return memslot - slots->memslots;
972 static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
975 if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
979 *nr_pages = slot->npages - (gfn - slot->base_gfn);
981 return gfn_to_hva_memslot(slot, gfn);
984 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
986 return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
988 EXPORT_SYMBOL_GPL(gfn_to_hva);
990 static pfn_t get_fault_pfn(void)
992 get_page(fault_page);
996 static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic,
997 bool *async, bool write_fault, bool *writable)
999 struct page *page[1];
1003 /* we can do it either atomically or asynchronously, not both */
1004 BUG_ON(atomic && async);
1006 BUG_ON(!write_fault && !writable);
1011 if (atomic || async)
1012 npages = __get_user_pages_fast(addr, 1, 1, page);
1014 if (unlikely(npages != 1) && !atomic) {
1018 *writable = write_fault;
1020 npages = get_user_pages_fast(addr, 1, write_fault, page);
1022 /* map read fault as writable if possible */
1023 if (unlikely(!write_fault) && npages == 1) {
1024 struct page *wpage[1];
1026 npages = __get_user_pages_fast(addr, 1, 1, wpage);
1036 if (unlikely(npages != 1)) {
1037 struct vm_area_struct *vma;
1040 return get_fault_pfn();
1042 down_read(¤t->mm->mmap_sem);
1043 if (is_hwpoison_address(addr)) {
1044 up_read(¤t->mm->mmap_sem);
1045 get_page(hwpoison_page);
1046 return page_to_pfn(hwpoison_page);
1049 vma = find_vma_intersection(current->mm, addr, addr+1);
1052 pfn = get_fault_pfn();
1053 else if ((vma->vm_flags & VM_PFNMAP)) {
1054 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) +
1056 BUG_ON(!kvm_is_mmio_pfn(pfn));
1058 if (async && (vma->vm_flags & VM_WRITE))
1060 pfn = get_fault_pfn();
1062 up_read(¤t->mm->mmap_sem);
1064 pfn = page_to_pfn(page[0]);
1069 pfn_t hva_to_pfn_atomic(struct kvm *kvm, unsigned long addr)
1071 return hva_to_pfn(kvm, addr, true, NULL, true, NULL);
1073 EXPORT_SYMBOL_GPL(hva_to_pfn_atomic);
1075 static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async,
1076 bool write_fault, bool *writable)
1083 addr = gfn_to_hva(kvm, gfn);
1084 if (kvm_is_error_hva(addr)) {
1086 return page_to_pfn(bad_page);
1089 return hva_to_pfn(kvm, addr, atomic, async, write_fault, writable);
1092 pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
1094 return __gfn_to_pfn(kvm, gfn, true, NULL, true, NULL);
1096 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
1098 pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async,
1099 bool write_fault, bool *writable)
1101 return __gfn_to_pfn(kvm, gfn, false, async, write_fault, writable);
1103 EXPORT_SYMBOL_GPL(gfn_to_pfn_async);
1105 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1107 return __gfn_to_pfn(kvm, gfn, false, NULL, true, NULL);
1109 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1111 pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1114 return __gfn_to_pfn(kvm, gfn, false, NULL, write_fault, writable);
1116 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
1118 pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
1119 struct kvm_memory_slot *slot, gfn_t gfn)
1121 unsigned long addr = gfn_to_hva_memslot(slot, gfn);
1122 return hva_to_pfn(kvm, addr, false, NULL, true, NULL);
1125 int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
1131 addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry);
1132 if (kvm_is_error_hva(addr))
1135 if (entry < nr_pages)
1138 return __get_user_pages_fast(addr, nr_pages, 1, pages);
1140 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
1142 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1146 pfn = gfn_to_pfn(kvm, gfn);
1147 if (!kvm_is_mmio_pfn(pfn))
1148 return pfn_to_page(pfn);
1150 WARN_ON(kvm_is_mmio_pfn(pfn));
1156 EXPORT_SYMBOL_GPL(gfn_to_page);
1158 void kvm_release_page_clean(struct page *page)
1160 kvm_release_pfn_clean(page_to_pfn(page));
1162 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1164 void kvm_release_pfn_clean(pfn_t pfn)
1166 if (!kvm_is_mmio_pfn(pfn))
1167 put_page(pfn_to_page(pfn));
1169 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1171 void kvm_release_page_dirty(struct page *page)
1173 kvm_release_pfn_dirty(page_to_pfn(page));
1175 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1177 void kvm_release_pfn_dirty(pfn_t pfn)
1179 kvm_set_pfn_dirty(pfn);
1180 kvm_release_pfn_clean(pfn);
1182 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1184 void kvm_set_page_dirty(struct page *page)
1186 kvm_set_pfn_dirty(page_to_pfn(page));
1188 EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
1190 void kvm_set_pfn_dirty(pfn_t pfn)
1192 if (!kvm_is_mmio_pfn(pfn)) {
1193 struct page *page = pfn_to_page(pfn);
1194 if (!PageReserved(page))
1198 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1200 void kvm_set_pfn_accessed(pfn_t pfn)
1202 if (!kvm_is_mmio_pfn(pfn))
1203 mark_page_accessed(pfn_to_page(pfn));
1205 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1207 void kvm_get_pfn(pfn_t pfn)
1209 if (!kvm_is_mmio_pfn(pfn))
1210 get_page(pfn_to_page(pfn));
1212 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1214 static int next_segment(unsigned long len, int offset)
1216 if (len > PAGE_SIZE - offset)
1217 return PAGE_SIZE - offset;
1222 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1228 addr = gfn_to_hva(kvm, gfn);
1229 if (kvm_is_error_hva(addr))
1231 r = copy_from_user(data, (void __user *)addr + offset, len);
1236 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1238 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1240 gfn_t gfn = gpa >> PAGE_SHIFT;
1242 int offset = offset_in_page(gpa);
1245 while ((seg = next_segment(len, offset)) != 0) {
1246 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1256 EXPORT_SYMBOL_GPL(kvm_read_guest);
1258 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1263 gfn_t gfn = gpa >> PAGE_SHIFT;
1264 int offset = offset_in_page(gpa);
1266 addr = gfn_to_hva(kvm, gfn);
1267 if (kvm_is_error_hva(addr))
1269 pagefault_disable();
1270 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1276 EXPORT_SYMBOL(kvm_read_guest_atomic);
1278 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1279 int offset, int len)
1284 addr = gfn_to_hva(kvm, gfn);
1285 if (kvm_is_error_hva(addr))
1287 r = copy_to_user((void __user *)addr + offset, data, len);
1290 mark_page_dirty(kvm, gfn);
1293 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1295 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1298 gfn_t gfn = gpa >> PAGE_SHIFT;
1300 int offset = offset_in_page(gpa);
1303 while ((seg = next_segment(len, offset)) != 0) {
1304 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1315 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1318 struct kvm_memslots *slots = kvm_memslots(kvm);
1319 int offset = offset_in_page(gpa);
1320 gfn_t gfn = gpa >> PAGE_SHIFT;
1323 ghc->generation = slots->generation;
1324 ghc->memslot = __gfn_to_memslot(slots, gfn);
1325 ghc->hva = gfn_to_hva_many(ghc->memslot, gfn, NULL);
1326 if (!kvm_is_error_hva(ghc->hva))
1333 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
1335 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1336 void *data, unsigned long len)
1338 struct kvm_memslots *slots = kvm_memslots(kvm);
1341 if (slots->generation != ghc->generation)
1342 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
1344 if (kvm_is_error_hva(ghc->hva))
1347 r = copy_to_user((void __user *)ghc->hva, data, len);
1350 mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT);
1354 EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
1356 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1358 return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page,
1361 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1363 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1365 gfn_t gfn = gpa >> PAGE_SHIFT;
1367 int offset = offset_in_page(gpa);
1370 while ((seg = next_segment(len, offset)) != 0) {
1371 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1380 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1382 void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot,
1385 if (memslot && memslot->dirty_bitmap) {
1386 unsigned long rel_gfn = gfn - memslot->base_gfn;
1388 generic___set_le_bit(rel_gfn, memslot->dirty_bitmap);
1392 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1394 struct kvm_memory_slot *memslot;
1396 memslot = gfn_to_memslot(kvm, gfn);
1397 mark_page_dirty_in_slot(kvm, memslot, gfn);
1401 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1403 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1408 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1410 if (kvm_arch_vcpu_runnable(vcpu)) {
1411 kvm_make_request(KVM_REQ_UNHALT, vcpu);
1414 if (kvm_cpu_has_pending_timer(vcpu))
1416 if (signal_pending(current))
1422 finish_wait(&vcpu->wq, &wait);
1425 void kvm_resched(struct kvm_vcpu *vcpu)
1427 if (!need_resched())
1431 EXPORT_SYMBOL_GPL(kvm_resched);
1433 void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu)
1438 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1440 /* Sleep for 100 us, and hope lock-holder got scheduled */
1441 expires = ktime_add_ns(ktime_get(), 100000UL);
1442 schedule_hrtimeout(&expires, HRTIMER_MODE_ABS);
1444 finish_wait(&vcpu->wq, &wait);
1446 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
1448 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1450 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1453 if (vmf->pgoff == 0)
1454 page = virt_to_page(vcpu->run);
1456 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
1457 page = virt_to_page(vcpu->arch.pio_data);
1459 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1460 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1461 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1464 return VM_FAULT_SIGBUS;
1470 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
1471 .fault = kvm_vcpu_fault,
1474 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1476 vma->vm_ops = &kvm_vcpu_vm_ops;
1480 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1482 struct kvm_vcpu *vcpu = filp->private_data;
1484 kvm_put_kvm(vcpu->kvm);
1488 static struct file_operations kvm_vcpu_fops = {
1489 .release = kvm_vcpu_release,
1490 .unlocked_ioctl = kvm_vcpu_ioctl,
1491 .compat_ioctl = kvm_vcpu_ioctl,
1492 .mmap = kvm_vcpu_mmap,
1493 .llseek = noop_llseek,
1497 * Allocates an inode for the vcpu.
1499 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1501 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR);
1505 * Creates some virtual cpus. Good luck creating more than one.
1507 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
1510 struct kvm_vcpu *vcpu, *v;
1512 vcpu = kvm_arch_vcpu_create(kvm, id);
1514 return PTR_ERR(vcpu);
1516 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1518 r = kvm_arch_vcpu_setup(vcpu);
1522 mutex_lock(&kvm->lock);
1523 if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
1528 kvm_for_each_vcpu(r, v, kvm)
1529 if (v->vcpu_id == id) {
1534 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
1536 /* Now it's all set up, let userspace reach it */
1538 r = create_vcpu_fd(vcpu);
1544 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
1546 atomic_inc(&kvm->online_vcpus);
1548 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1549 if (kvm->bsp_vcpu_id == id)
1550 kvm->bsp_vcpu = vcpu;
1552 mutex_unlock(&kvm->lock);
1556 mutex_unlock(&kvm->lock);
1557 kvm_arch_vcpu_destroy(vcpu);
1561 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1564 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1565 vcpu->sigset_active = 1;
1566 vcpu->sigset = *sigset;
1568 vcpu->sigset_active = 0;
1572 static long kvm_vcpu_ioctl(struct file *filp,
1573 unsigned int ioctl, unsigned long arg)
1575 struct kvm_vcpu *vcpu = filp->private_data;
1576 void __user *argp = (void __user *)arg;
1578 struct kvm_fpu *fpu = NULL;
1579 struct kvm_sregs *kvm_sregs = NULL;
1581 if (vcpu->kvm->mm != current->mm)
1584 #if defined(CONFIG_S390) || defined(CONFIG_PPC)
1586 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1587 * so vcpu_load() would break it.
1589 if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT)
1590 return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1600 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
1601 trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
1603 case KVM_GET_REGS: {
1604 struct kvm_regs *kvm_regs;
1607 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1610 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
1614 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1621 case KVM_SET_REGS: {
1622 struct kvm_regs *kvm_regs;
1625 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1629 if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs)))
1631 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
1639 case KVM_GET_SREGS: {
1640 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1644 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
1648 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
1653 case KVM_SET_SREGS: {
1654 kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1659 if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs)))
1661 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
1667 case KVM_GET_MP_STATE: {
1668 struct kvm_mp_state mp_state;
1670 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
1674 if (copy_to_user(argp, &mp_state, sizeof mp_state))
1679 case KVM_SET_MP_STATE: {
1680 struct kvm_mp_state mp_state;
1683 if (copy_from_user(&mp_state, argp, sizeof mp_state))
1685 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
1691 case KVM_TRANSLATE: {
1692 struct kvm_translation tr;
1695 if (copy_from_user(&tr, argp, sizeof tr))
1697 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
1701 if (copy_to_user(argp, &tr, sizeof tr))
1706 case KVM_SET_GUEST_DEBUG: {
1707 struct kvm_guest_debug dbg;
1710 if (copy_from_user(&dbg, argp, sizeof dbg))
1712 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
1718 case KVM_SET_SIGNAL_MASK: {
1719 struct kvm_signal_mask __user *sigmask_arg = argp;
1720 struct kvm_signal_mask kvm_sigmask;
1721 sigset_t sigset, *p;
1726 if (copy_from_user(&kvm_sigmask, argp,
1727 sizeof kvm_sigmask))
1730 if (kvm_sigmask.len != sizeof sigset)
1733 if (copy_from_user(&sigset, sigmask_arg->sigset,
1738 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
1742 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1746 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
1750 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
1756 fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1761 if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu)))
1763 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
1770 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1779 static long kvm_vm_ioctl(struct file *filp,
1780 unsigned int ioctl, unsigned long arg)
1782 struct kvm *kvm = filp->private_data;
1783 void __user *argp = (void __user *)arg;
1786 if (kvm->mm != current->mm)
1789 case KVM_CREATE_VCPU:
1790 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
1794 case KVM_SET_USER_MEMORY_REGION: {
1795 struct kvm_userspace_memory_region kvm_userspace_mem;
1798 if (copy_from_user(&kvm_userspace_mem, argp,
1799 sizeof kvm_userspace_mem))
1802 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
1807 case KVM_GET_DIRTY_LOG: {
1808 struct kvm_dirty_log log;
1811 if (copy_from_user(&log, argp, sizeof log))
1813 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
1818 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1819 case KVM_REGISTER_COALESCED_MMIO: {
1820 struct kvm_coalesced_mmio_zone zone;
1822 if (copy_from_user(&zone, argp, sizeof zone))
1824 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
1830 case KVM_UNREGISTER_COALESCED_MMIO: {
1831 struct kvm_coalesced_mmio_zone zone;
1833 if (copy_from_user(&zone, argp, sizeof zone))
1835 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
1843 struct kvm_irqfd data;
1846 if (copy_from_user(&data, argp, sizeof data))
1848 r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags);
1851 case KVM_IOEVENTFD: {
1852 struct kvm_ioeventfd data;
1855 if (copy_from_user(&data, argp, sizeof data))
1857 r = kvm_ioeventfd(kvm, &data);
1860 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1861 case KVM_SET_BOOT_CPU_ID:
1863 mutex_lock(&kvm->lock);
1864 if (atomic_read(&kvm->online_vcpus) != 0)
1867 kvm->bsp_vcpu_id = arg;
1868 mutex_unlock(&kvm->lock);
1872 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
1874 r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
1880 #ifdef CONFIG_COMPAT
1881 struct compat_kvm_dirty_log {
1885 compat_uptr_t dirty_bitmap; /* one bit per page */
1890 static long kvm_vm_compat_ioctl(struct file *filp,
1891 unsigned int ioctl, unsigned long arg)
1893 struct kvm *kvm = filp->private_data;
1896 if (kvm->mm != current->mm)
1899 case KVM_GET_DIRTY_LOG: {
1900 struct compat_kvm_dirty_log compat_log;
1901 struct kvm_dirty_log log;
1904 if (copy_from_user(&compat_log, (void __user *)arg,
1905 sizeof(compat_log)))
1907 log.slot = compat_log.slot;
1908 log.padding1 = compat_log.padding1;
1909 log.padding2 = compat_log.padding2;
1910 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
1912 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
1918 r = kvm_vm_ioctl(filp, ioctl, arg);
1926 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1928 struct page *page[1];
1931 gfn_t gfn = vmf->pgoff;
1932 struct kvm *kvm = vma->vm_file->private_data;
1934 addr = gfn_to_hva(kvm, gfn);
1935 if (kvm_is_error_hva(addr))
1936 return VM_FAULT_SIGBUS;
1938 npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
1940 if (unlikely(npages != 1))
1941 return VM_FAULT_SIGBUS;
1943 vmf->page = page[0];
1947 static const struct vm_operations_struct kvm_vm_vm_ops = {
1948 .fault = kvm_vm_fault,
1951 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
1953 vma->vm_ops = &kvm_vm_vm_ops;
1957 static struct file_operations kvm_vm_fops = {
1958 .release = kvm_vm_release,
1959 .unlocked_ioctl = kvm_vm_ioctl,
1960 #ifdef CONFIG_COMPAT
1961 .compat_ioctl = kvm_vm_compat_ioctl,
1963 .mmap = kvm_vm_mmap,
1964 .llseek = noop_llseek,
1967 static int kvm_dev_ioctl_create_vm(void)
1972 kvm = kvm_create_vm();
1974 return PTR_ERR(kvm);
1975 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1976 r = kvm_coalesced_mmio_init(kvm);
1982 r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
1989 static long kvm_dev_ioctl_check_extension_generic(long arg)
1992 case KVM_CAP_USER_MEMORY:
1993 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
1994 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
1995 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1996 case KVM_CAP_SET_BOOT_CPU_ID:
1998 case KVM_CAP_INTERNAL_ERROR_DATA:
2000 #ifdef CONFIG_HAVE_KVM_IRQCHIP
2001 case KVM_CAP_IRQ_ROUTING:
2002 return KVM_MAX_IRQ_ROUTES;
2007 return kvm_dev_ioctl_check_extension(arg);
2010 static long kvm_dev_ioctl(struct file *filp,
2011 unsigned int ioctl, unsigned long arg)
2016 case KVM_GET_API_VERSION:
2020 r = KVM_API_VERSION;
2026 r = kvm_dev_ioctl_create_vm();
2028 case KVM_CHECK_EXTENSION:
2029 r = kvm_dev_ioctl_check_extension_generic(arg);
2031 case KVM_GET_VCPU_MMAP_SIZE:
2035 r = PAGE_SIZE; /* struct kvm_run */
2037 r += PAGE_SIZE; /* pio data page */
2039 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2040 r += PAGE_SIZE; /* coalesced mmio ring page */
2043 case KVM_TRACE_ENABLE:
2044 case KVM_TRACE_PAUSE:
2045 case KVM_TRACE_DISABLE:
2049 return kvm_arch_dev_ioctl(filp, ioctl, arg);
2055 static struct file_operations kvm_chardev_ops = {
2056 .unlocked_ioctl = kvm_dev_ioctl,
2057 .compat_ioctl = kvm_dev_ioctl,
2058 .llseek = noop_llseek,
2061 static struct miscdevice kvm_dev = {
2067 static void hardware_enable_nolock(void *junk)
2069 int cpu = raw_smp_processor_id();
2072 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
2075 cpumask_set_cpu(cpu, cpus_hardware_enabled);
2077 r = kvm_arch_hardware_enable(NULL);
2080 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2081 atomic_inc(&hardware_enable_failed);
2082 printk(KERN_INFO "kvm: enabling virtualization on "
2083 "CPU%d failed\n", cpu);
2087 static void hardware_enable(void *junk)
2089 spin_lock(&kvm_lock);
2090 hardware_enable_nolock(junk);
2091 spin_unlock(&kvm_lock);
2094 static void hardware_disable_nolock(void *junk)
2096 int cpu = raw_smp_processor_id();
2098 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
2100 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2101 kvm_arch_hardware_disable(NULL);
2104 static void hardware_disable(void *junk)
2106 spin_lock(&kvm_lock);
2107 hardware_disable_nolock(junk);
2108 spin_unlock(&kvm_lock);
2111 static void hardware_disable_all_nolock(void)
2113 BUG_ON(!kvm_usage_count);
2116 if (!kvm_usage_count)
2117 on_each_cpu(hardware_disable_nolock, NULL, 1);
2120 static void hardware_disable_all(void)
2122 spin_lock(&kvm_lock);
2123 hardware_disable_all_nolock();
2124 spin_unlock(&kvm_lock);
2127 static int hardware_enable_all(void)
2131 spin_lock(&kvm_lock);
2134 if (kvm_usage_count == 1) {
2135 atomic_set(&hardware_enable_failed, 0);
2136 on_each_cpu(hardware_enable_nolock, NULL, 1);
2138 if (atomic_read(&hardware_enable_failed)) {
2139 hardware_disable_all_nolock();
2144 spin_unlock(&kvm_lock);
2149 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2154 if (!kvm_usage_count)
2157 val &= ~CPU_TASKS_FROZEN;
2160 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2162 hardware_disable(NULL);
2165 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2167 hardware_enable(NULL);
2174 asmlinkage void kvm_handle_fault_on_reboot(void)
2176 if (kvm_rebooting) {
2177 /* spin while reset goes on */
2182 /* Fault while not rebooting. We want the trace. */
2185 EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot);
2187 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2191 * Some (well, at least mine) BIOSes hang on reboot if
2194 * And Intel TXT required VMX off for all cpu when system shutdown.
2196 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2197 kvm_rebooting = true;
2198 on_each_cpu(hardware_disable_nolock, NULL, 1);
2202 static struct notifier_block kvm_reboot_notifier = {
2203 .notifier_call = kvm_reboot,
2207 static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
2211 for (i = 0; i < bus->dev_count; i++) {
2212 struct kvm_io_device *pos = bus->devs[i];
2214 kvm_iodevice_destructor(pos);
2219 /* kvm_io_bus_write - called under kvm->slots_lock */
2220 int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2221 int len, const void *val)
2224 struct kvm_io_bus *bus;
2226 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2227 for (i = 0; i < bus->dev_count; i++)
2228 if (!kvm_iodevice_write(bus->devs[i], addr, len, val))
2233 /* kvm_io_bus_read - called under kvm->slots_lock */
2234 int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2238 struct kvm_io_bus *bus;
2240 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2241 for (i = 0; i < bus->dev_count; i++)
2242 if (!kvm_iodevice_read(bus->devs[i], addr, len, val))
2247 /* Caller must hold slots_lock. */
2248 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2249 struct kvm_io_device *dev)
2251 struct kvm_io_bus *new_bus, *bus;
2253 bus = kvm->buses[bus_idx];
2254 if (bus->dev_count > NR_IOBUS_DEVS-1)
2257 new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL);
2260 memcpy(new_bus, bus, sizeof(struct kvm_io_bus));
2261 new_bus->devs[new_bus->dev_count++] = dev;
2262 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2263 synchronize_srcu_expedited(&kvm->srcu);
2269 /* Caller must hold slots_lock. */
2270 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2271 struct kvm_io_device *dev)
2274 struct kvm_io_bus *new_bus, *bus;
2276 new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL);
2280 bus = kvm->buses[bus_idx];
2281 memcpy(new_bus, bus, sizeof(struct kvm_io_bus));
2284 for (i = 0; i < new_bus->dev_count; i++)
2285 if (new_bus->devs[i] == dev) {
2287 new_bus->devs[i] = new_bus->devs[--new_bus->dev_count];
2296 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2297 synchronize_srcu_expedited(&kvm->srcu);
2302 static struct notifier_block kvm_cpu_notifier = {
2303 .notifier_call = kvm_cpu_hotplug,
2306 static int vm_stat_get(void *_offset, u64 *val)
2308 unsigned offset = (long)_offset;
2312 spin_lock(&kvm_lock);
2313 list_for_each_entry(kvm, &vm_list, vm_list)
2314 *val += *(u32 *)((void *)kvm + offset);
2315 spin_unlock(&kvm_lock);
2319 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
2321 static int vcpu_stat_get(void *_offset, u64 *val)
2323 unsigned offset = (long)_offset;
2325 struct kvm_vcpu *vcpu;
2329 spin_lock(&kvm_lock);
2330 list_for_each_entry(kvm, &vm_list, vm_list)
2331 kvm_for_each_vcpu(i, vcpu, kvm)
2332 *val += *(u32 *)((void *)vcpu + offset);
2334 spin_unlock(&kvm_lock);
2338 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
2340 static const struct file_operations *stat_fops[] = {
2341 [KVM_STAT_VCPU] = &vcpu_stat_fops,
2342 [KVM_STAT_VM] = &vm_stat_fops,
2345 static void kvm_init_debug(void)
2347 struct kvm_stats_debugfs_item *p;
2349 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
2350 for (p = debugfs_entries; p->name; ++p)
2351 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
2352 (void *)(long)p->offset,
2353 stat_fops[p->kind]);
2356 static void kvm_exit_debug(void)
2358 struct kvm_stats_debugfs_item *p;
2360 for (p = debugfs_entries; p->name; ++p)
2361 debugfs_remove(p->dentry);
2362 debugfs_remove(kvm_debugfs_dir);
2365 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
2367 if (kvm_usage_count)
2368 hardware_disable_nolock(NULL);
2372 static int kvm_resume(struct sys_device *dev)
2374 if (kvm_usage_count) {
2375 WARN_ON(spin_is_locked(&kvm_lock));
2376 hardware_enable_nolock(NULL);
2381 static struct sysdev_class kvm_sysdev_class = {
2383 .suspend = kvm_suspend,
2384 .resume = kvm_resume,
2387 static struct sys_device kvm_sysdev = {
2389 .cls = &kvm_sysdev_class,
2392 struct page *bad_page;
2396 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
2398 return container_of(pn, struct kvm_vcpu, preempt_notifier);
2401 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
2403 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2405 kvm_arch_vcpu_load(vcpu, cpu);
2408 static void kvm_sched_out(struct preempt_notifier *pn,
2409 struct task_struct *next)
2411 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2413 kvm_arch_vcpu_put(vcpu);
2416 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
2417 struct module *module)
2422 r = kvm_arch_init(opaque);
2426 bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2428 if (bad_page == NULL) {
2433 bad_pfn = page_to_pfn(bad_page);
2435 hwpoison_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2437 if (hwpoison_page == NULL) {
2442 hwpoison_pfn = page_to_pfn(hwpoison_page);
2444 fault_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2446 if (fault_page == NULL) {
2451 fault_pfn = page_to_pfn(fault_page);
2453 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
2458 r = kvm_arch_hardware_setup();
2462 for_each_online_cpu(cpu) {
2463 smp_call_function_single(cpu,
2464 kvm_arch_check_processor_compat,
2470 r = register_cpu_notifier(&kvm_cpu_notifier);
2473 register_reboot_notifier(&kvm_reboot_notifier);
2475 r = sysdev_class_register(&kvm_sysdev_class);
2479 r = sysdev_register(&kvm_sysdev);
2483 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2485 vcpu_align = __alignof__(struct kvm_vcpu);
2486 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
2488 if (!kvm_vcpu_cache) {
2493 r = kvm_async_pf_init();
2497 kvm_chardev_ops.owner = module;
2498 kvm_vm_fops.owner = module;
2499 kvm_vcpu_fops.owner = module;
2501 r = misc_register(&kvm_dev);
2503 printk(KERN_ERR "kvm: misc device register failed\n");
2507 kvm_preempt_ops.sched_in = kvm_sched_in;
2508 kvm_preempt_ops.sched_out = kvm_sched_out;
2515 kvm_async_pf_deinit();
2517 kmem_cache_destroy(kvm_vcpu_cache);
2519 sysdev_unregister(&kvm_sysdev);
2521 sysdev_class_unregister(&kvm_sysdev_class);
2523 unregister_reboot_notifier(&kvm_reboot_notifier);
2524 unregister_cpu_notifier(&kvm_cpu_notifier);
2527 kvm_arch_hardware_unsetup();
2529 free_cpumask_var(cpus_hardware_enabled);
2532 __free_page(fault_page);
2534 __free_page(hwpoison_page);
2535 __free_page(bad_page);
2541 EXPORT_SYMBOL_GPL(kvm_init);
2546 misc_deregister(&kvm_dev);
2547 kmem_cache_destroy(kvm_vcpu_cache);
2548 kvm_async_pf_deinit();
2549 sysdev_unregister(&kvm_sysdev);
2550 sysdev_class_unregister(&kvm_sysdev_class);
2551 unregister_reboot_notifier(&kvm_reboot_notifier);
2552 unregister_cpu_notifier(&kvm_cpu_notifier);
2553 on_each_cpu(hardware_disable_nolock, NULL, 1);
2554 kvm_arch_hardware_unsetup();
2556 free_cpumask_var(cpus_hardware_enabled);
2557 __free_page(hwpoison_page);
2558 __free_page(bad_page);
2560 EXPORT_SYMBOL_GPL(kvm_exit);