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 if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
172 ++kvm->stat.remote_tlb_flush;
175 void kvm_reload_remote_mmus(struct kvm *kvm)
177 make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
180 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
185 mutex_init(&vcpu->mutex);
189 init_waitqueue_head(&vcpu->wq);
190 kvm_async_pf_vcpu_init(vcpu);
192 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
197 vcpu->run = page_address(page);
199 r = kvm_arch_vcpu_init(vcpu);
205 free_page((unsigned long)vcpu->run);
209 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
211 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
213 kvm_arch_vcpu_uninit(vcpu);
214 free_page((unsigned long)vcpu->run);
216 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
218 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
219 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
221 return container_of(mn, struct kvm, mmu_notifier);
224 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
225 struct mm_struct *mm,
226 unsigned long address)
228 struct kvm *kvm = mmu_notifier_to_kvm(mn);
229 int need_tlb_flush, idx;
232 * When ->invalidate_page runs, the linux pte has been zapped
233 * already but the page is still allocated until
234 * ->invalidate_page returns. So if we increase the sequence
235 * here the kvm page fault will notice if the spte can't be
236 * established because the page is going to be freed. If
237 * instead the kvm page fault establishes the spte before
238 * ->invalidate_page runs, kvm_unmap_hva will release it
241 * The sequence increase only need to be seen at spin_unlock
242 * time, and not at spin_lock time.
244 * Increasing the sequence after the spin_unlock would be
245 * unsafe because the kvm page fault could then establish the
246 * pte after kvm_unmap_hva returned, without noticing the page
247 * is going to be freed.
249 idx = srcu_read_lock(&kvm->srcu);
250 spin_lock(&kvm->mmu_lock);
251 kvm->mmu_notifier_seq++;
252 need_tlb_flush = kvm_unmap_hva(kvm, address);
253 spin_unlock(&kvm->mmu_lock);
254 srcu_read_unlock(&kvm->srcu, idx);
256 /* we've to flush the tlb before the pages can be freed */
258 kvm_flush_remote_tlbs(kvm);
262 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
263 struct mm_struct *mm,
264 unsigned long address,
267 struct kvm *kvm = mmu_notifier_to_kvm(mn);
270 idx = srcu_read_lock(&kvm->srcu);
271 spin_lock(&kvm->mmu_lock);
272 kvm->mmu_notifier_seq++;
273 kvm_set_spte_hva(kvm, address, pte);
274 spin_unlock(&kvm->mmu_lock);
275 srcu_read_unlock(&kvm->srcu, idx);
278 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
279 struct mm_struct *mm,
283 struct kvm *kvm = mmu_notifier_to_kvm(mn);
284 int need_tlb_flush = 0, idx;
286 idx = srcu_read_lock(&kvm->srcu);
287 spin_lock(&kvm->mmu_lock);
289 * The count increase must become visible at unlock time as no
290 * spte can be established without taking the mmu_lock and
291 * count is also read inside the mmu_lock critical section.
293 kvm->mmu_notifier_count++;
294 for (; start < end; start += PAGE_SIZE)
295 need_tlb_flush |= kvm_unmap_hva(kvm, start);
296 spin_unlock(&kvm->mmu_lock);
297 srcu_read_unlock(&kvm->srcu, idx);
299 /* we've to flush the tlb before the pages can be freed */
301 kvm_flush_remote_tlbs(kvm);
304 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
305 struct mm_struct *mm,
309 struct kvm *kvm = mmu_notifier_to_kvm(mn);
311 spin_lock(&kvm->mmu_lock);
313 * This sequence increase will notify the kvm page fault that
314 * the page that is going to be mapped in the spte could have
317 kvm->mmu_notifier_seq++;
319 * The above sequence increase must be visible before the
320 * below count decrease but both values are read by the kvm
321 * page fault under mmu_lock spinlock so we don't need to add
322 * a smb_wmb() here in between the two.
324 kvm->mmu_notifier_count--;
325 spin_unlock(&kvm->mmu_lock);
327 BUG_ON(kvm->mmu_notifier_count < 0);
330 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
331 struct mm_struct *mm,
332 unsigned long address)
334 struct kvm *kvm = mmu_notifier_to_kvm(mn);
337 idx = srcu_read_lock(&kvm->srcu);
338 spin_lock(&kvm->mmu_lock);
339 young = kvm_age_hva(kvm, address);
340 spin_unlock(&kvm->mmu_lock);
341 srcu_read_unlock(&kvm->srcu, idx);
344 kvm_flush_remote_tlbs(kvm);
349 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
350 struct mm_struct *mm)
352 struct kvm *kvm = mmu_notifier_to_kvm(mn);
355 idx = srcu_read_lock(&kvm->srcu);
356 kvm_arch_flush_shadow(kvm);
357 srcu_read_unlock(&kvm->srcu, idx);
360 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
361 .invalidate_page = kvm_mmu_notifier_invalidate_page,
362 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
363 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
364 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
365 .change_pte = kvm_mmu_notifier_change_pte,
366 .release = kvm_mmu_notifier_release,
369 static int kvm_init_mmu_notifier(struct kvm *kvm)
371 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
372 return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
375 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
377 static int kvm_init_mmu_notifier(struct kvm *kvm)
382 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
384 static struct kvm *kvm_create_vm(void)
387 struct kvm *kvm = kvm_arch_create_vm();
392 r = hardware_enable_all();
394 goto out_err_nodisable;
396 #ifdef CONFIG_HAVE_KVM_IRQCHIP
397 INIT_HLIST_HEAD(&kvm->mask_notifier_list);
398 INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
402 kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
405 if (init_srcu_struct(&kvm->srcu))
407 for (i = 0; i < KVM_NR_BUSES; i++) {
408 kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus),
410 if (!kvm->buses[i]) {
411 cleanup_srcu_struct(&kvm->srcu);
416 r = kvm_init_mmu_notifier(kvm);
418 cleanup_srcu_struct(&kvm->srcu);
422 kvm->mm = current->mm;
423 atomic_inc(&kvm->mm->mm_count);
424 spin_lock_init(&kvm->mmu_lock);
425 raw_spin_lock_init(&kvm->requests_lock);
426 kvm_eventfd_init(kvm);
427 mutex_init(&kvm->lock);
428 mutex_init(&kvm->irq_lock);
429 mutex_init(&kvm->slots_lock);
430 atomic_set(&kvm->users_count, 1);
431 spin_lock(&kvm_lock);
432 list_add(&kvm->vm_list, &vm_list);
433 spin_unlock(&kvm_lock);
438 hardware_disable_all();
440 for (i = 0; i < KVM_NR_BUSES; i++)
441 kfree(kvm->buses[i]);
442 kfree(kvm->memslots);
448 * Free any memory in @free but not in @dont.
450 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
451 struct kvm_memory_slot *dont)
455 if (!dont || free->rmap != dont->rmap)
458 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
459 vfree(free->dirty_bitmap);
462 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
463 if (!dont || free->lpage_info[i] != dont->lpage_info[i]) {
464 vfree(free->lpage_info[i]);
465 free->lpage_info[i] = NULL;
470 free->dirty_bitmap = NULL;
474 void kvm_free_physmem(struct kvm *kvm)
477 struct kvm_memslots *slots = kvm->memslots;
479 for (i = 0; i < slots->nmemslots; ++i)
480 kvm_free_physmem_slot(&slots->memslots[i], NULL);
482 kfree(kvm->memslots);
485 static void kvm_destroy_vm(struct kvm *kvm)
488 struct mm_struct *mm = kvm->mm;
490 kvm_arch_sync_events(kvm);
491 spin_lock(&kvm_lock);
492 list_del(&kvm->vm_list);
493 spin_unlock(&kvm_lock);
494 kvm_free_irq_routing(kvm);
495 for (i = 0; i < KVM_NR_BUSES; i++)
496 kvm_io_bus_destroy(kvm->buses[i]);
497 kvm_coalesced_mmio_free(kvm);
498 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
499 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
501 kvm_arch_flush_shadow(kvm);
503 kvm_arch_destroy_vm(kvm);
504 hardware_disable_all();
508 void kvm_get_kvm(struct kvm *kvm)
510 atomic_inc(&kvm->users_count);
512 EXPORT_SYMBOL_GPL(kvm_get_kvm);
514 void kvm_put_kvm(struct kvm *kvm)
516 if (atomic_dec_and_test(&kvm->users_count))
519 EXPORT_SYMBOL_GPL(kvm_put_kvm);
522 static int kvm_vm_release(struct inode *inode, struct file *filp)
524 struct kvm *kvm = filp->private_data;
526 kvm_irqfd_release(kvm);
533 * Allocate some memory and give it an address in the guest physical address
536 * Discontiguous memory is allowed, mostly for framebuffers.
538 * Must be called holding mmap_sem for write.
540 int __kvm_set_memory_region(struct kvm *kvm,
541 struct kvm_userspace_memory_region *mem,
544 int r, flush_shadow = 0;
546 unsigned long npages;
548 struct kvm_memory_slot *memslot;
549 struct kvm_memory_slot old, new;
550 struct kvm_memslots *slots, *old_memslots;
553 /* General sanity checks */
554 if (mem->memory_size & (PAGE_SIZE - 1))
556 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
558 if (user_alloc && (mem->userspace_addr & (PAGE_SIZE - 1)))
560 if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
562 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
565 memslot = &kvm->memslots->memslots[mem->slot];
566 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
567 npages = mem->memory_size >> PAGE_SHIFT;
570 if (npages > KVM_MEM_MAX_NR_PAGES)
574 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
576 new = old = *memslot;
579 new.base_gfn = base_gfn;
581 new.flags = mem->flags;
583 /* Disallow changing a memory slot's size. */
585 if (npages && old.npages && npages != old.npages)
588 /* Check for overlaps */
590 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
591 struct kvm_memory_slot *s = &kvm->memslots->memslots[i];
593 if (s == memslot || !s->npages)
595 if (!((base_gfn + npages <= s->base_gfn) ||
596 (base_gfn >= s->base_gfn + s->npages)))
600 /* Free page dirty bitmap if unneeded */
601 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
602 new.dirty_bitmap = NULL;
606 /* Allocate if a slot is being created */
608 if (npages && !new.rmap) {
609 new.rmap = vmalloc(npages * sizeof(*new.rmap));
614 memset(new.rmap, 0, npages * sizeof(*new.rmap));
616 new.user_alloc = user_alloc;
617 new.userspace_addr = mem->userspace_addr;
622 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
628 /* Avoid unused variable warning if no large pages */
631 if (new.lpage_info[i])
634 lpages = 1 + ((base_gfn + npages - 1)
635 >> KVM_HPAGE_GFN_SHIFT(level));
636 lpages -= base_gfn >> KVM_HPAGE_GFN_SHIFT(level);
638 new.lpage_info[i] = vmalloc(lpages * sizeof(*new.lpage_info[i]));
640 if (!new.lpage_info[i])
643 memset(new.lpage_info[i], 0,
644 lpages * sizeof(*new.lpage_info[i]));
646 if (base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1))
647 new.lpage_info[i][0].write_count = 1;
648 if ((base_gfn+npages) & (KVM_PAGES_PER_HPAGE(level) - 1))
649 new.lpage_info[i][lpages - 1].write_count = 1;
650 ugfn = new.userspace_addr >> PAGE_SHIFT;
652 * If the gfn and userspace address are not aligned wrt each
653 * other, or if explicitly asked to, disable large page
654 * support for this slot
656 if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
658 for (j = 0; j < lpages; ++j)
659 new.lpage_info[i][j].write_count = 1;
664 /* Allocate page dirty bitmap if needed */
665 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
666 unsigned long dirty_bytes = kvm_dirty_bitmap_bytes(&new);
668 new.dirty_bitmap = vmalloc(dirty_bytes);
669 if (!new.dirty_bitmap)
671 memset(new.dirty_bitmap, 0, dirty_bytes);
672 /* destroy any largepage mappings for dirty tracking */
676 #else /* not defined CONFIG_S390 */
677 new.user_alloc = user_alloc;
679 new.userspace_addr = mem->userspace_addr;
680 #endif /* not defined CONFIG_S390 */
684 slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
687 memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
688 if (mem->slot >= slots->nmemslots)
689 slots->nmemslots = mem->slot + 1;
691 slots->memslots[mem->slot].flags |= KVM_MEMSLOT_INVALID;
693 old_memslots = kvm->memslots;
694 rcu_assign_pointer(kvm->memslots, slots);
695 synchronize_srcu_expedited(&kvm->srcu);
696 /* From this point no new shadow pages pointing to a deleted
697 * memslot will be created.
699 * validation of sp->gfn happens in:
700 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
701 * - kvm_is_visible_gfn (mmu_check_roots)
703 kvm_arch_flush_shadow(kvm);
707 r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc);
711 /* map the pages in iommu page table */
713 r = kvm_iommu_map_pages(kvm, &new);
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;
727 /* actual memory is freed via old in kvm_free_physmem_slot below */
730 new.dirty_bitmap = NULL;
731 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i)
732 new.lpage_info[i] = NULL;
735 slots->memslots[mem->slot] = new;
736 old_memslots = kvm->memslots;
737 rcu_assign_pointer(kvm->memslots, slots);
738 synchronize_srcu_expedited(&kvm->srcu);
740 kvm_arch_commit_memory_region(kvm, mem, old, user_alloc);
742 kvm_free_physmem_slot(&old, &new);
746 kvm_arch_flush_shadow(kvm);
751 kvm_free_physmem_slot(&new, &old);
756 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
758 int kvm_set_memory_region(struct kvm *kvm,
759 struct kvm_userspace_memory_region *mem,
764 mutex_lock(&kvm->slots_lock);
765 r = __kvm_set_memory_region(kvm, mem, user_alloc);
766 mutex_unlock(&kvm->slots_lock);
769 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
771 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
773 kvm_userspace_memory_region *mem,
776 if (mem->slot >= KVM_MEMORY_SLOTS)
778 return kvm_set_memory_region(kvm, mem, user_alloc);
781 int kvm_get_dirty_log(struct kvm *kvm,
782 struct kvm_dirty_log *log, int *is_dirty)
784 struct kvm_memory_slot *memslot;
787 unsigned long any = 0;
790 if (log->slot >= KVM_MEMORY_SLOTS)
793 memslot = &kvm->memslots->memslots[log->slot];
795 if (!memslot->dirty_bitmap)
798 n = kvm_dirty_bitmap_bytes(memslot);
800 for (i = 0; !any && i < n/sizeof(long); ++i)
801 any = memslot->dirty_bitmap[i];
804 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
815 void kvm_disable_largepages(void)
817 largepages_enabled = false;
819 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
821 int is_error_page(struct page *page)
823 return page == bad_page || page == hwpoison_page || page == fault_page;
825 EXPORT_SYMBOL_GPL(is_error_page);
827 int is_error_pfn(pfn_t pfn)
829 return pfn == bad_pfn || pfn == hwpoison_pfn || pfn == fault_pfn;
831 EXPORT_SYMBOL_GPL(is_error_pfn);
833 int is_hwpoison_pfn(pfn_t pfn)
835 return pfn == hwpoison_pfn;
837 EXPORT_SYMBOL_GPL(is_hwpoison_pfn);
839 int is_fault_pfn(pfn_t pfn)
841 return pfn == fault_pfn;
843 EXPORT_SYMBOL_GPL(is_fault_pfn);
845 static inline unsigned long bad_hva(void)
850 int kvm_is_error_hva(unsigned long addr)
852 return addr == bad_hva();
854 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
856 static struct kvm_memory_slot *__gfn_to_memslot(struct kvm_memslots *slots,
861 for (i = 0; i < slots->nmemslots; ++i) {
862 struct kvm_memory_slot *memslot = &slots->memslots[i];
864 if (gfn >= memslot->base_gfn
865 && gfn < memslot->base_gfn + memslot->npages)
871 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
873 return __gfn_to_memslot(kvm_memslots(kvm), gfn);
875 EXPORT_SYMBOL_GPL(gfn_to_memslot);
877 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
880 struct kvm_memslots *slots = kvm_memslots(kvm);
882 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
883 struct kvm_memory_slot *memslot = &slots->memslots[i];
885 if (memslot->flags & KVM_MEMSLOT_INVALID)
888 if (gfn >= memslot->base_gfn
889 && gfn < memslot->base_gfn + memslot->npages)
894 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
896 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
898 struct vm_area_struct *vma;
899 unsigned long addr, size;
903 addr = gfn_to_hva(kvm, gfn);
904 if (kvm_is_error_hva(addr))
907 down_read(¤t->mm->mmap_sem);
908 vma = find_vma(current->mm, addr);
912 size = vma_kernel_pagesize(vma);
915 up_read(¤t->mm->mmap_sem);
920 int memslot_id(struct kvm *kvm, gfn_t gfn)
923 struct kvm_memslots *slots = kvm_memslots(kvm);
924 struct kvm_memory_slot *memslot = NULL;
926 for (i = 0; i < slots->nmemslots; ++i) {
927 memslot = &slots->memslots[i];
929 if (gfn >= memslot->base_gfn
930 && gfn < memslot->base_gfn + memslot->npages)
934 return memslot - slots->memslots;
937 static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
940 if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
944 *nr_pages = slot->npages - (gfn - slot->base_gfn);
946 return gfn_to_hva_memslot(slot, gfn);
949 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
951 return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
953 EXPORT_SYMBOL_GPL(gfn_to_hva);
955 static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic,
958 struct page *page[1];
962 /* we can do it either atomically or asynchronously, not both */
963 BUG_ON(atomic && async);
966 npages = __get_user_pages_fast(addr, 1, 1, page);
968 if (unlikely(npages != 1) && !atomic) {
970 npages = get_user_pages_fast(addr, 1, 1, page);
973 if (unlikely(npages != 1)) {
974 struct vm_area_struct *vma;
977 goto return_fault_page;
979 down_read(¤t->mm->mmap_sem);
980 if (is_hwpoison_address(addr)) {
981 up_read(¤t->mm->mmap_sem);
982 get_page(hwpoison_page);
983 return page_to_pfn(hwpoison_page);
986 vma = find_vma(current->mm, addr);
988 if (vma == NULL || addr < vma->vm_start ||
989 !(vma->vm_flags & VM_PFNMAP)) {
990 if (async && !(vma->vm_flags & VM_PFNMAP) &&
991 (vma->vm_flags & VM_WRITE))
993 up_read(¤t->mm->mmap_sem);
995 get_page(fault_page);
996 return page_to_pfn(fault_page);
999 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
1000 up_read(¤t->mm->mmap_sem);
1001 BUG_ON(!kvm_is_mmio_pfn(pfn));
1003 pfn = page_to_pfn(page[0]);
1008 pfn_t hva_to_pfn_atomic(struct kvm *kvm, unsigned long addr)
1010 return hva_to_pfn(kvm, addr, true, NULL);
1012 EXPORT_SYMBOL_GPL(hva_to_pfn_atomic);
1014 static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async)
1021 addr = gfn_to_hva(kvm, gfn);
1022 if (kvm_is_error_hva(addr)) {
1024 return page_to_pfn(bad_page);
1027 return hva_to_pfn(kvm, addr, atomic, async);
1030 pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
1032 return __gfn_to_pfn(kvm, gfn, true, NULL);
1034 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
1036 pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async)
1038 return __gfn_to_pfn(kvm, gfn, false, async);
1040 EXPORT_SYMBOL_GPL(gfn_to_pfn_async);
1042 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1044 return __gfn_to_pfn(kvm, gfn, false, NULL);
1046 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1048 pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
1049 struct kvm_memory_slot *slot, gfn_t gfn)
1051 unsigned long addr = gfn_to_hva_memslot(slot, gfn);
1052 return hva_to_pfn(kvm, addr, false, NULL);
1055 int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
1061 addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry);
1062 if (kvm_is_error_hva(addr))
1065 if (entry < nr_pages)
1068 return __get_user_pages_fast(addr, nr_pages, 1, pages);
1070 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
1072 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1076 pfn = gfn_to_pfn(kvm, gfn);
1077 if (!kvm_is_mmio_pfn(pfn))
1078 return pfn_to_page(pfn);
1080 WARN_ON(kvm_is_mmio_pfn(pfn));
1086 EXPORT_SYMBOL_GPL(gfn_to_page);
1088 void kvm_release_page_clean(struct page *page)
1090 kvm_release_pfn_clean(page_to_pfn(page));
1092 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1094 void kvm_release_pfn_clean(pfn_t pfn)
1096 if (!kvm_is_mmio_pfn(pfn))
1097 put_page(pfn_to_page(pfn));
1099 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1101 void kvm_release_page_dirty(struct page *page)
1103 kvm_release_pfn_dirty(page_to_pfn(page));
1105 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1107 void kvm_release_pfn_dirty(pfn_t pfn)
1109 kvm_set_pfn_dirty(pfn);
1110 kvm_release_pfn_clean(pfn);
1112 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1114 void kvm_set_page_dirty(struct page *page)
1116 kvm_set_pfn_dirty(page_to_pfn(page));
1118 EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
1120 void kvm_set_pfn_dirty(pfn_t pfn)
1122 if (!kvm_is_mmio_pfn(pfn)) {
1123 struct page *page = pfn_to_page(pfn);
1124 if (!PageReserved(page))
1128 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1130 void kvm_set_pfn_accessed(pfn_t pfn)
1132 if (!kvm_is_mmio_pfn(pfn))
1133 mark_page_accessed(pfn_to_page(pfn));
1135 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1137 void kvm_get_pfn(pfn_t pfn)
1139 if (!kvm_is_mmio_pfn(pfn))
1140 get_page(pfn_to_page(pfn));
1142 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1144 static int next_segment(unsigned long len, int offset)
1146 if (len > PAGE_SIZE - offset)
1147 return PAGE_SIZE - offset;
1152 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1158 addr = gfn_to_hva(kvm, gfn);
1159 if (kvm_is_error_hva(addr))
1161 r = copy_from_user(data, (void __user *)addr + offset, len);
1166 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1168 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1170 gfn_t gfn = gpa >> PAGE_SHIFT;
1172 int offset = offset_in_page(gpa);
1175 while ((seg = next_segment(len, offset)) != 0) {
1176 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1186 EXPORT_SYMBOL_GPL(kvm_read_guest);
1188 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1193 gfn_t gfn = gpa >> PAGE_SHIFT;
1194 int offset = offset_in_page(gpa);
1196 addr = gfn_to_hva(kvm, gfn);
1197 if (kvm_is_error_hva(addr))
1199 pagefault_disable();
1200 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1206 EXPORT_SYMBOL(kvm_read_guest_atomic);
1208 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1209 int offset, int len)
1214 addr = gfn_to_hva(kvm, gfn);
1215 if (kvm_is_error_hva(addr))
1217 r = copy_to_user((void __user *)addr + offset, data, len);
1220 mark_page_dirty(kvm, gfn);
1223 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1225 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1228 gfn_t gfn = gpa >> PAGE_SHIFT;
1230 int offset = offset_in_page(gpa);
1233 while ((seg = next_segment(len, offset)) != 0) {
1234 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1245 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1248 struct kvm_memslots *slots = kvm_memslots(kvm);
1249 int offset = offset_in_page(gpa);
1250 gfn_t gfn = gpa >> PAGE_SHIFT;
1253 ghc->generation = slots->generation;
1254 ghc->memslot = __gfn_to_memslot(slots, gfn);
1255 ghc->hva = gfn_to_hva_many(ghc->memslot, gfn, NULL);
1256 if (!kvm_is_error_hva(ghc->hva))
1263 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
1265 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1266 void *data, unsigned long len)
1268 struct kvm_memslots *slots = kvm_memslots(kvm);
1271 if (slots->generation != ghc->generation)
1272 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
1274 if (kvm_is_error_hva(ghc->hva))
1277 r = copy_to_user((void __user *)ghc->hva, data, len);
1280 mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT);
1284 EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
1286 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1288 return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len);
1290 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1292 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1294 gfn_t gfn = gpa >> PAGE_SHIFT;
1296 int offset = offset_in_page(gpa);
1299 while ((seg = next_segment(len, offset)) != 0) {
1300 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1309 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1311 void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot,
1314 if (memslot && memslot->dirty_bitmap) {
1315 unsigned long rel_gfn = gfn - memslot->base_gfn;
1317 generic___set_le_bit(rel_gfn, memslot->dirty_bitmap);
1321 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1323 struct kvm_memory_slot *memslot;
1325 memslot = gfn_to_memslot(kvm, gfn);
1326 mark_page_dirty_in_slot(kvm, memslot, gfn);
1330 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1332 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1337 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1339 if (kvm_arch_vcpu_runnable(vcpu)) {
1340 kvm_make_request(KVM_REQ_UNHALT, vcpu);
1343 if (kvm_cpu_has_pending_timer(vcpu))
1345 if (signal_pending(current))
1351 finish_wait(&vcpu->wq, &wait);
1354 void kvm_resched(struct kvm_vcpu *vcpu)
1356 if (!need_resched())
1360 EXPORT_SYMBOL_GPL(kvm_resched);
1362 void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu)
1367 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1369 /* Sleep for 100 us, and hope lock-holder got scheduled */
1370 expires = ktime_add_ns(ktime_get(), 100000UL);
1371 schedule_hrtimeout(&expires, HRTIMER_MODE_ABS);
1373 finish_wait(&vcpu->wq, &wait);
1375 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
1377 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1379 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1382 if (vmf->pgoff == 0)
1383 page = virt_to_page(vcpu->run);
1385 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
1386 page = virt_to_page(vcpu->arch.pio_data);
1388 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1389 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1390 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1393 return VM_FAULT_SIGBUS;
1399 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
1400 .fault = kvm_vcpu_fault,
1403 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1405 vma->vm_ops = &kvm_vcpu_vm_ops;
1409 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1411 struct kvm_vcpu *vcpu = filp->private_data;
1413 kvm_put_kvm(vcpu->kvm);
1417 static struct file_operations kvm_vcpu_fops = {
1418 .release = kvm_vcpu_release,
1419 .unlocked_ioctl = kvm_vcpu_ioctl,
1420 .compat_ioctl = kvm_vcpu_ioctl,
1421 .mmap = kvm_vcpu_mmap,
1422 .llseek = noop_llseek,
1426 * Allocates an inode for the vcpu.
1428 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1430 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR);
1434 * Creates some virtual cpus. Good luck creating more than one.
1436 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
1439 struct kvm_vcpu *vcpu, *v;
1441 vcpu = kvm_arch_vcpu_create(kvm, id);
1443 return PTR_ERR(vcpu);
1445 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1447 r = kvm_arch_vcpu_setup(vcpu);
1451 mutex_lock(&kvm->lock);
1452 if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
1457 kvm_for_each_vcpu(r, v, kvm)
1458 if (v->vcpu_id == id) {
1463 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
1465 /* Now it's all set up, let userspace reach it */
1467 r = create_vcpu_fd(vcpu);
1473 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
1475 atomic_inc(&kvm->online_vcpus);
1477 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1478 if (kvm->bsp_vcpu_id == id)
1479 kvm->bsp_vcpu = vcpu;
1481 mutex_unlock(&kvm->lock);
1485 mutex_unlock(&kvm->lock);
1486 kvm_arch_vcpu_destroy(vcpu);
1490 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1493 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1494 vcpu->sigset_active = 1;
1495 vcpu->sigset = *sigset;
1497 vcpu->sigset_active = 0;
1501 static long kvm_vcpu_ioctl(struct file *filp,
1502 unsigned int ioctl, unsigned long arg)
1504 struct kvm_vcpu *vcpu = filp->private_data;
1505 void __user *argp = (void __user *)arg;
1507 struct kvm_fpu *fpu = NULL;
1508 struct kvm_sregs *kvm_sregs = NULL;
1510 if (vcpu->kvm->mm != current->mm)
1513 #if defined(CONFIG_S390) || defined(CONFIG_PPC)
1515 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1516 * so vcpu_load() would break it.
1518 if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT)
1519 return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1529 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
1531 case KVM_GET_REGS: {
1532 struct kvm_regs *kvm_regs;
1535 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1538 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
1542 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1549 case KVM_SET_REGS: {
1550 struct kvm_regs *kvm_regs;
1553 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1557 if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs)))
1559 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
1567 case KVM_GET_SREGS: {
1568 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1572 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
1576 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
1581 case KVM_SET_SREGS: {
1582 kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1587 if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs)))
1589 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
1595 case KVM_GET_MP_STATE: {
1596 struct kvm_mp_state mp_state;
1598 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
1602 if (copy_to_user(argp, &mp_state, sizeof mp_state))
1607 case KVM_SET_MP_STATE: {
1608 struct kvm_mp_state mp_state;
1611 if (copy_from_user(&mp_state, argp, sizeof mp_state))
1613 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
1619 case KVM_TRANSLATE: {
1620 struct kvm_translation tr;
1623 if (copy_from_user(&tr, argp, sizeof tr))
1625 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
1629 if (copy_to_user(argp, &tr, sizeof tr))
1634 case KVM_SET_GUEST_DEBUG: {
1635 struct kvm_guest_debug dbg;
1638 if (copy_from_user(&dbg, argp, sizeof dbg))
1640 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
1646 case KVM_SET_SIGNAL_MASK: {
1647 struct kvm_signal_mask __user *sigmask_arg = argp;
1648 struct kvm_signal_mask kvm_sigmask;
1649 sigset_t sigset, *p;
1654 if (copy_from_user(&kvm_sigmask, argp,
1655 sizeof kvm_sigmask))
1658 if (kvm_sigmask.len != sizeof sigset)
1661 if (copy_from_user(&sigset, sigmask_arg->sigset,
1666 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
1670 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1674 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
1678 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
1684 fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1689 if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu)))
1691 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
1698 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1707 static long kvm_vm_ioctl(struct file *filp,
1708 unsigned int ioctl, unsigned long arg)
1710 struct kvm *kvm = filp->private_data;
1711 void __user *argp = (void __user *)arg;
1714 if (kvm->mm != current->mm)
1717 case KVM_CREATE_VCPU:
1718 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
1722 case KVM_SET_USER_MEMORY_REGION: {
1723 struct kvm_userspace_memory_region kvm_userspace_mem;
1726 if (copy_from_user(&kvm_userspace_mem, argp,
1727 sizeof kvm_userspace_mem))
1730 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
1735 case KVM_GET_DIRTY_LOG: {
1736 struct kvm_dirty_log log;
1739 if (copy_from_user(&log, argp, sizeof log))
1741 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
1746 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1747 case KVM_REGISTER_COALESCED_MMIO: {
1748 struct kvm_coalesced_mmio_zone zone;
1750 if (copy_from_user(&zone, argp, sizeof zone))
1752 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
1758 case KVM_UNREGISTER_COALESCED_MMIO: {
1759 struct kvm_coalesced_mmio_zone zone;
1761 if (copy_from_user(&zone, argp, sizeof zone))
1763 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
1771 struct kvm_irqfd data;
1774 if (copy_from_user(&data, argp, sizeof data))
1776 r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags);
1779 case KVM_IOEVENTFD: {
1780 struct kvm_ioeventfd data;
1783 if (copy_from_user(&data, argp, sizeof data))
1785 r = kvm_ioeventfd(kvm, &data);
1788 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1789 case KVM_SET_BOOT_CPU_ID:
1791 mutex_lock(&kvm->lock);
1792 if (atomic_read(&kvm->online_vcpus) != 0)
1795 kvm->bsp_vcpu_id = arg;
1796 mutex_unlock(&kvm->lock);
1800 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
1802 r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
1808 #ifdef CONFIG_COMPAT
1809 struct compat_kvm_dirty_log {
1813 compat_uptr_t dirty_bitmap; /* one bit per page */
1818 static long kvm_vm_compat_ioctl(struct file *filp,
1819 unsigned int ioctl, unsigned long arg)
1821 struct kvm *kvm = filp->private_data;
1824 if (kvm->mm != current->mm)
1827 case KVM_GET_DIRTY_LOG: {
1828 struct compat_kvm_dirty_log compat_log;
1829 struct kvm_dirty_log log;
1832 if (copy_from_user(&compat_log, (void __user *)arg,
1833 sizeof(compat_log)))
1835 log.slot = compat_log.slot;
1836 log.padding1 = compat_log.padding1;
1837 log.padding2 = compat_log.padding2;
1838 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
1840 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
1846 r = kvm_vm_ioctl(filp, ioctl, arg);
1854 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1856 struct page *page[1];
1859 gfn_t gfn = vmf->pgoff;
1860 struct kvm *kvm = vma->vm_file->private_data;
1862 addr = gfn_to_hva(kvm, gfn);
1863 if (kvm_is_error_hva(addr))
1864 return VM_FAULT_SIGBUS;
1866 npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
1868 if (unlikely(npages != 1))
1869 return VM_FAULT_SIGBUS;
1871 vmf->page = page[0];
1875 static const struct vm_operations_struct kvm_vm_vm_ops = {
1876 .fault = kvm_vm_fault,
1879 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
1881 vma->vm_ops = &kvm_vm_vm_ops;
1885 static struct file_operations kvm_vm_fops = {
1886 .release = kvm_vm_release,
1887 .unlocked_ioctl = kvm_vm_ioctl,
1888 #ifdef CONFIG_COMPAT
1889 .compat_ioctl = kvm_vm_compat_ioctl,
1891 .mmap = kvm_vm_mmap,
1892 .llseek = noop_llseek,
1895 static int kvm_dev_ioctl_create_vm(void)
1900 kvm = kvm_create_vm();
1902 return PTR_ERR(kvm);
1903 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1904 r = kvm_coalesced_mmio_init(kvm);
1910 fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
1917 static long kvm_dev_ioctl_check_extension_generic(long arg)
1920 case KVM_CAP_USER_MEMORY:
1921 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
1922 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
1923 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1924 case KVM_CAP_SET_BOOT_CPU_ID:
1926 case KVM_CAP_INTERNAL_ERROR_DATA:
1928 #ifdef CONFIG_HAVE_KVM_IRQCHIP
1929 case KVM_CAP_IRQ_ROUTING:
1930 return KVM_MAX_IRQ_ROUTES;
1935 return kvm_dev_ioctl_check_extension(arg);
1938 static long kvm_dev_ioctl(struct file *filp,
1939 unsigned int ioctl, unsigned long arg)
1944 case KVM_GET_API_VERSION:
1948 r = KVM_API_VERSION;
1954 r = kvm_dev_ioctl_create_vm();
1956 case KVM_CHECK_EXTENSION:
1957 r = kvm_dev_ioctl_check_extension_generic(arg);
1959 case KVM_GET_VCPU_MMAP_SIZE:
1963 r = PAGE_SIZE; /* struct kvm_run */
1965 r += PAGE_SIZE; /* pio data page */
1967 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1968 r += PAGE_SIZE; /* coalesced mmio ring page */
1971 case KVM_TRACE_ENABLE:
1972 case KVM_TRACE_PAUSE:
1973 case KVM_TRACE_DISABLE:
1977 return kvm_arch_dev_ioctl(filp, ioctl, arg);
1983 static struct file_operations kvm_chardev_ops = {
1984 .unlocked_ioctl = kvm_dev_ioctl,
1985 .compat_ioctl = kvm_dev_ioctl,
1986 .llseek = noop_llseek,
1989 static struct miscdevice kvm_dev = {
1995 static void hardware_enable(void *junk)
1997 int cpu = raw_smp_processor_id();
2000 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
2003 cpumask_set_cpu(cpu, cpus_hardware_enabled);
2005 r = kvm_arch_hardware_enable(NULL);
2008 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2009 atomic_inc(&hardware_enable_failed);
2010 printk(KERN_INFO "kvm: enabling virtualization on "
2011 "CPU%d failed\n", cpu);
2015 static void hardware_disable(void *junk)
2017 int cpu = raw_smp_processor_id();
2019 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
2021 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2022 kvm_arch_hardware_disable(NULL);
2025 static void hardware_disable_all_nolock(void)
2027 BUG_ON(!kvm_usage_count);
2030 if (!kvm_usage_count)
2031 on_each_cpu(hardware_disable, NULL, 1);
2034 static void hardware_disable_all(void)
2036 spin_lock(&kvm_lock);
2037 hardware_disable_all_nolock();
2038 spin_unlock(&kvm_lock);
2041 static int hardware_enable_all(void)
2045 spin_lock(&kvm_lock);
2048 if (kvm_usage_count == 1) {
2049 atomic_set(&hardware_enable_failed, 0);
2050 on_each_cpu(hardware_enable, NULL, 1);
2052 if (atomic_read(&hardware_enable_failed)) {
2053 hardware_disable_all_nolock();
2058 spin_unlock(&kvm_lock);
2063 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2068 if (!kvm_usage_count)
2071 val &= ~CPU_TASKS_FROZEN;
2074 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2076 hardware_disable(NULL);
2079 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2081 spin_lock(&kvm_lock);
2082 hardware_enable(NULL);
2083 spin_unlock(&kvm_lock);
2090 asmlinkage void kvm_handle_fault_on_reboot(void)
2092 if (kvm_rebooting) {
2093 /* spin while reset goes on */
2098 /* Fault while not rebooting. We want the trace. */
2101 EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot);
2103 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2107 * Some (well, at least mine) BIOSes hang on reboot if
2110 * And Intel TXT required VMX off for all cpu when system shutdown.
2112 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2113 kvm_rebooting = true;
2114 on_each_cpu(hardware_disable, NULL, 1);
2118 static struct notifier_block kvm_reboot_notifier = {
2119 .notifier_call = kvm_reboot,
2123 static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
2127 for (i = 0; i < bus->dev_count; i++) {
2128 struct kvm_io_device *pos = bus->devs[i];
2130 kvm_iodevice_destructor(pos);
2135 /* kvm_io_bus_write - called under kvm->slots_lock */
2136 int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2137 int len, const void *val)
2140 struct kvm_io_bus *bus;
2142 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2143 for (i = 0; i < bus->dev_count; i++)
2144 if (!kvm_iodevice_write(bus->devs[i], addr, len, val))
2149 /* kvm_io_bus_read - called under kvm->slots_lock */
2150 int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2154 struct kvm_io_bus *bus;
2156 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2157 for (i = 0; i < bus->dev_count; i++)
2158 if (!kvm_iodevice_read(bus->devs[i], addr, len, val))
2163 /* Caller must hold slots_lock. */
2164 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2165 struct kvm_io_device *dev)
2167 struct kvm_io_bus *new_bus, *bus;
2169 bus = kvm->buses[bus_idx];
2170 if (bus->dev_count > NR_IOBUS_DEVS-1)
2173 new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL);
2176 memcpy(new_bus, bus, sizeof(struct kvm_io_bus));
2177 new_bus->devs[new_bus->dev_count++] = dev;
2178 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2179 synchronize_srcu_expedited(&kvm->srcu);
2185 /* Caller must hold slots_lock. */
2186 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2187 struct kvm_io_device *dev)
2190 struct kvm_io_bus *new_bus, *bus;
2192 new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL);
2196 bus = kvm->buses[bus_idx];
2197 memcpy(new_bus, bus, sizeof(struct kvm_io_bus));
2200 for (i = 0; i < new_bus->dev_count; i++)
2201 if (new_bus->devs[i] == dev) {
2203 new_bus->devs[i] = new_bus->devs[--new_bus->dev_count];
2212 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2213 synchronize_srcu_expedited(&kvm->srcu);
2218 static struct notifier_block kvm_cpu_notifier = {
2219 .notifier_call = kvm_cpu_hotplug,
2222 static int vm_stat_get(void *_offset, u64 *val)
2224 unsigned offset = (long)_offset;
2228 spin_lock(&kvm_lock);
2229 list_for_each_entry(kvm, &vm_list, vm_list)
2230 *val += *(u32 *)((void *)kvm + offset);
2231 spin_unlock(&kvm_lock);
2235 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
2237 static int vcpu_stat_get(void *_offset, u64 *val)
2239 unsigned offset = (long)_offset;
2241 struct kvm_vcpu *vcpu;
2245 spin_lock(&kvm_lock);
2246 list_for_each_entry(kvm, &vm_list, vm_list)
2247 kvm_for_each_vcpu(i, vcpu, kvm)
2248 *val += *(u32 *)((void *)vcpu + offset);
2250 spin_unlock(&kvm_lock);
2254 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
2256 static const struct file_operations *stat_fops[] = {
2257 [KVM_STAT_VCPU] = &vcpu_stat_fops,
2258 [KVM_STAT_VM] = &vm_stat_fops,
2261 static void kvm_init_debug(void)
2263 struct kvm_stats_debugfs_item *p;
2265 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
2266 for (p = debugfs_entries; p->name; ++p)
2267 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
2268 (void *)(long)p->offset,
2269 stat_fops[p->kind]);
2272 static void kvm_exit_debug(void)
2274 struct kvm_stats_debugfs_item *p;
2276 for (p = debugfs_entries; p->name; ++p)
2277 debugfs_remove(p->dentry);
2278 debugfs_remove(kvm_debugfs_dir);
2281 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
2283 if (kvm_usage_count)
2284 hardware_disable(NULL);
2288 static int kvm_resume(struct sys_device *dev)
2290 if (kvm_usage_count) {
2291 WARN_ON(spin_is_locked(&kvm_lock));
2292 hardware_enable(NULL);
2297 static struct sysdev_class kvm_sysdev_class = {
2299 .suspend = kvm_suspend,
2300 .resume = kvm_resume,
2303 static struct sys_device kvm_sysdev = {
2305 .cls = &kvm_sysdev_class,
2308 struct page *bad_page;
2312 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
2314 return container_of(pn, struct kvm_vcpu, preempt_notifier);
2317 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
2319 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2321 kvm_arch_vcpu_load(vcpu, cpu);
2324 static void kvm_sched_out(struct preempt_notifier *pn,
2325 struct task_struct *next)
2327 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2329 kvm_arch_vcpu_put(vcpu);
2332 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
2333 struct module *module)
2338 r = kvm_arch_init(opaque);
2342 bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2344 if (bad_page == NULL) {
2349 bad_pfn = page_to_pfn(bad_page);
2351 hwpoison_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2353 if (hwpoison_page == NULL) {
2358 hwpoison_pfn = page_to_pfn(hwpoison_page);
2360 fault_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2362 if (fault_page == NULL) {
2367 fault_pfn = page_to_pfn(fault_page);
2369 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
2374 r = kvm_arch_hardware_setup();
2378 for_each_online_cpu(cpu) {
2379 smp_call_function_single(cpu,
2380 kvm_arch_check_processor_compat,
2386 r = register_cpu_notifier(&kvm_cpu_notifier);
2389 register_reboot_notifier(&kvm_reboot_notifier);
2391 r = sysdev_class_register(&kvm_sysdev_class);
2395 r = sysdev_register(&kvm_sysdev);
2399 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2401 vcpu_align = __alignof__(struct kvm_vcpu);
2402 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
2404 if (!kvm_vcpu_cache) {
2409 r = kvm_async_pf_init();
2413 kvm_chardev_ops.owner = module;
2414 kvm_vm_fops.owner = module;
2415 kvm_vcpu_fops.owner = module;
2417 r = misc_register(&kvm_dev);
2419 printk(KERN_ERR "kvm: misc device register failed\n");
2423 kvm_preempt_ops.sched_in = kvm_sched_in;
2424 kvm_preempt_ops.sched_out = kvm_sched_out;
2431 kvm_async_pf_deinit();
2433 kmem_cache_destroy(kvm_vcpu_cache);
2435 sysdev_unregister(&kvm_sysdev);
2437 sysdev_class_unregister(&kvm_sysdev_class);
2439 unregister_reboot_notifier(&kvm_reboot_notifier);
2440 unregister_cpu_notifier(&kvm_cpu_notifier);
2443 kvm_arch_hardware_unsetup();
2445 free_cpumask_var(cpus_hardware_enabled);
2448 __free_page(fault_page);
2450 __free_page(hwpoison_page);
2451 __free_page(bad_page);
2457 EXPORT_SYMBOL_GPL(kvm_init);
2462 misc_deregister(&kvm_dev);
2463 kmem_cache_destroy(kvm_vcpu_cache);
2464 kvm_async_pf_deinit();
2465 sysdev_unregister(&kvm_sysdev);
2466 sysdev_class_unregister(&kvm_sysdev_class);
2467 unregister_reboot_notifier(&kvm_reboot_notifier);
2468 unregister_cpu_notifier(&kvm_cpu_notifier);
2469 on_each_cpu(hardware_disable, NULL, 1);
2470 kvm_arch_hardware_unsetup();
2472 free_cpumask_var(cpus_hardware_enabled);
2473 __free_page(hwpoison_page);
2474 __free_page(bad_page);
2476 EXPORT_SYMBOL_GPL(kvm_exit);