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.
10 * Avi Kivity <avi@qumranet.com>
11 * Yaniv Kamay <yaniv@qumranet.com>
13 * This work is licensed under the terms of the GNU GPL, version 2. See
14 * the COPYING file in the top-level directory.
20 #include <linux/kvm_host.h>
21 #include <linux/kvm.h>
22 #include <linux/module.h>
23 #include <linux/errno.h>
24 #include <linux/percpu.h>
26 #include <linux/miscdevice.h>
27 #include <linux/vmalloc.h>
28 #include <linux/reboot.h>
29 #include <linux/debugfs.h>
30 #include <linux/highmem.h>
31 #include <linux/file.h>
32 #include <linux/sysdev.h>
33 #include <linux/cpu.h>
34 #include <linux/sched.h>
35 #include <linux/cpumask.h>
36 #include <linux/smp.h>
37 #include <linux/anon_inodes.h>
38 #include <linux/profile.h>
39 #include <linux/kvm_para.h>
40 #include <linux/pagemap.h>
41 #include <linux/mman.h>
42 #include <linux/swap.h>
43 #include <linux/bitops.h>
44 #include <linux/spinlock.h>
45 #include <linux/compat.h>
46 #include <linux/srcu.h>
47 #include <linux/hugetlb.h>
48 #include <linux/slab.h>
50 #include <asm/processor.h>
52 #include <asm/uaccess.h>
53 #include <asm/pgtable.h>
54 #include <asm-generic/bitops/le.h>
56 #include "coalesced_mmio.h"
58 #define CREATE_TRACE_POINTS
59 #include <trace/events/kvm.h>
61 MODULE_AUTHOR("Qumranet");
62 MODULE_LICENSE("GPL");
67 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
70 DEFINE_SPINLOCK(kvm_lock);
73 static cpumask_var_t cpus_hardware_enabled;
74 static int kvm_usage_count = 0;
75 static atomic_t hardware_enable_failed;
77 struct kmem_cache *kvm_vcpu_cache;
78 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
80 static __read_mostly struct preempt_ops kvm_preempt_ops;
82 struct dentry *kvm_debugfs_dir;
84 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
86 static int hardware_enable_all(void);
87 static void hardware_disable_all(void);
89 static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
91 static bool kvm_rebooting;
93 static bool largepages_enabled = true;
95 struct page *hwpoison_page;
98 inline int kvm_is_mmio_pfn(pfn_t pfn)
100 if (pfn_valid(pfn)) {
101 struct page *page = compound_head(pfn_to_page(pfn));
102 return PageReserved(page);
109 * Switches to specified vcpu, until a matching vcpu_put()
111 void vcpu_load(struct kvm_vcpu *vcpu)
115 mutex_lock(&vcpu->mutex);
117 preempt_notifier_register(&vcpu->preempt_notifier);
118 kvm_arch_vcpu_load(vcpu, cpu);
122 void vcpu_put(struct kvm_vcpu *vcpu)
125 kvm_arch_vcpu_put(vcpu);
126 preempt_notifier_unregister(&vcpu->preempt_notifier);
128 mutex_unlock(&vcpu->mutex);
131 static void ack_flush(void *_completed)
135 static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
140 struct kvm_vcpu *vcpu;
142 zalloc_cpumask_var(&cpus, GFP_ATOMIC);
144 raw_spin_lock(&kvm->requests_lock);
145 me = smp_processor_id();
146 kvm_for_each_vcpu(i, vcpu, kvm) {
147 if (test_and_set_bit(req, &vcpu->requests))
150 if (cpus != NULL && cpu != -1 && cpu != me)
151 cpumask_set_cpu(cpu, cpus);
153 if (unlikely(cpus == NULL))
154 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
155 else if (!cpumask_empty(cpus))
156 smp_call_function_many(cpus, ack_flush, NULL, 1);
159 raw_spin_unlock(&kvm->requests_lock);
160 free_cpumask_var(cpus);
164 void kvm_flush_remote_tlbs(struct kvm *kvm)
166 if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
167 ++kvm->stat.remote_tlb_flush;
170 void kvm_reload_remote_mmus(struct kvm *kvm)
172 make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
175 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
180 mutex_init(&vcpu->mutex);
184 init_waitqueue_head(&vcpu->wq);
186 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
191 vcpu->run = page_address(page);
193 r = kvm_arch_vcpu_init(vcpu);
199 free_page((unsigned long)vcpu->run);
203 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
205 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
207 kvm_arch_vcpu_uninit(vcpu);
208 free_page((unsigned long)vcpu->run);
210 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
212 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
213 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
215 return container_of(mn, struct kvm, mmu_notifier);
218 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
219 struct mm_struct *mm,
220 unsigned long address)
222 struct kvm *kvm = mmu_notifier_to_kvm(mn);
223 int need_tlb_flush, idx;
226 * When ->invalidate_page runs, the linux pte has been zapped
227 * already but the page is still allocated until
228 * ->invalidate_page returns. So if we increase the sequence
229 * here the kvm page fault will notice if the spte can't be
230 * established because the page is going to be freed. If
231 * instead the kvm page fault establishes the spte before
232 * ->invalidate_page runs, kvm_unmap_hva will release it
235 * The sequence increase only need to be seen at spin_unlock
236 * time, and not at spin_lock time.
238 * Increasing the sequence after the spin_unlock would be
239 * unsafe because the kvm page fault could then establish the
240 * pte after kvm_unmap_hva returned, without noticing the page
241 * is going to be freed.
243 idx = srcu_read_lock(&kvm->srcu);
244 spin_lock(&kvm->mmu_lock);
245 kvm->mmu_notifier_seq++;
246 need_tlb_flush = kvm_unmap_hva(kvm, address);
247 spin_unlock(&kvm->mmu_lock);
248 srcu_read_unlock(&kvm->srcu, idx);
250 /* we've to flush the tlb before the pages can be freed */
252 kvm_flush_remote_tlbs(kvm);
256 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
257 struct mm_struct *mm,
258 unsigned long address,
261 struct kvm *kvm = mmu_notifier_to_kvm(mn);
264 idx = srcu_read_lock(&kvm->srcu);
265 spin_lock(&kvm->mmu_lock);
266 kvm->mmu_notifier_seq++;
267 kvm_set_spte_hva(kvm, address, pte);
268 spin_unlock(&kvm->mmu_lock);
269 srcu_read_unlock(&kvm->srcu, idx);
272 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
273 struct mm_struct *mm,
277 struct kvm *kvm = mmu_notifier_to_kvm(mn);
278 int need_tlb_flush = 0, idx;
280 idx = srcu_read_lock(&kvm->srcu);
281 spin_lock(&kvm->mmu_lock);
283 * The count increase must become visible at unlock time as no
284 * spte can be established without taking the mmu_lock and
285 * count is also read inside the mmu_lock critical section.
287 kvm->mmu_notifier_count++;
288 for (; start < end; start += PAGE_SIZE)
289 need_tlb_flush |= kvm_unmap_hva(kvm, start);
290 spin_unlock(&kvm->mmu_lock);
291 srcu_read_unlock(&kvm->srcu, idx);
293 /* we've to flush the tlb before the pages can be freed */
295 kvm_flush_remote_tlbs(kvm);
298 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
299 struct mm_struct *mm,
303 struct kvm *kvm = mmu_notifier_to_kvm(mn);
305 spin_lock(&kvm->mmu_lock);
307 * This sequence increase will notify the kvm page fault that
308 * the page that is going to be mapped in the spte could have
311 kvm->mmu_notifier_seq++;
313 * The above sequence increase must be visible before the
314 * below count decrease but both values are read by the kvm
315 * page fault under mmu_lock spinlock so we don't need to add
316 * a smb_wmb() here in between the two.
318 kvm->mmu_notifier_count--;
319 spin_unlock(&kvm->mmu_lock);
321 BUG_ON(kvm->mmu_notifier_count < 0);
324 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
325 struct mm_struct *mm,
326 unsigned long address)
328 struct kvm *kvm = mmu_notifier_to_kvm(mn);
331 idx = srcu_read_lock(&kvm->srcu);
332 spin_lock(&kvm->mmu_lock);
333 young = kvm_age_hva(kvm, address);
334 spin_unlock(&kvm->mmu_lock);
335 srcu_read_unlock(&kvm->srcu, idx);
338 kvm_flush_remote_tlbs(kvm);
343 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
344 struct mm_struct *mm)
346 struct kvm *kvm = mmu_notifier_to_kvm(mn);
349 idx = srcu_read_lock(&kvm->srcu);
350 kvm_arch_flush_shadow(kvm);
351 srcu_read_unlock(&kvm->srcu, idx);
354 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
355 .invalidate_page = kvm_mmu_notifier_invalidate_page,
356 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
357 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
358 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
359 .change_pte = kvm_mmu_notifier_change_pte,
360 .release = kvm_mmu_notifier_release,
363 static int kvm_init_mmu_notifier(struct kvm *kvm)
365 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
366 return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
369 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
371 static int kvm_init_mmu_notifier(struct kvm *kvm)
376 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
378 static struct kvm *kvm_create_vm(void)
381 struct kvm *kvm = kvm_arch_create_vm();
386 r = hardware_enable_all();
388 goto out_err_nodisable;
390 #ifdef CONFIG_HAVE_KVM_IRQCHIP
391 INIT_HLIST_HEAD(&kvm->mask_notifier_list);
392 INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
396 kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
399 if (init_srcu_struct(&kvm->srcu))
401 for (i = 0; i < KVM_NR_BUSES; i++) {
402 kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus),
404 if (!kvm->buses[i]) {
405 cleanup_srcu_struct(&kvm->srcu);
410 r = kvm_init_mmu_notifier(kvm);
412 cleanup_srcu_struct(&kvm->srcu);
416 kvm->mm = current->mm;
417 atomic_inc(&kvm->mm->mm_count);
418 spin_lock_init(&kvm->mmu_lock);
419 raw_spin_lock_init(&kvm->requests_lock);
420 kvm_eventfd_init(kvm);
421 mutex_init(&kvm->lock);
422 mutex_init(&kvm->irq_lock);
423 mutex_init(&kvm->slots_lock);
424 atomic_set(&kvm->users_count, 1);
425 spin_lock(&kvm_lock);
426 list_add(&kvm->vm_list, &vm_list);
427 spin_unlock(&kvm_lock);
432 hardware_disable_all();
434 for (i = 0; i < KVM_NR_BUSES; i++)
435 kfree(kvm->buses[i]);
436 kfree(kvm->memslots);
442 * Free any memory in @free but not in @dont.
444 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
445 struct kvm_memory_slot *dont)
449 if (!dont || free->rmap != dont->rmap)
452 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
453 vfree(free->dirty_bitmap);
456 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
457 if (!dont || free->lpage_info[i] != dont->lpage_info[i]) {
458 vfree(free->lpage_info[i]);
459 free->lpage_info[i] = NULL;
464 free->dirty_bitmap = NULL;
468 void kvm_free_physmem(struct kvm *kvm)
471 struct kvm_memslots *slots = kvm->memslots;
473 for (i = 0; i < slots->nmemslots; ++i)
474 kvm_free_physmem_slot(&slots->memslots[i], NULL);
476 kfree(kvm->memslots);
479 static void kvm_destroy_vm(struct kvm *kvm)
482 struct mm_struct *mm = kvm->mm;
484 kvm_arch_sync_events(kvm);
485 spin_lock(&kvm_lock);
486 list_del(&kvm->vm_list);
487 spin_unlock(&kvm_lock);
488 kvm_free_irq_routing(kvm);
489 for (i = 0; i < KVM_NR_BUSES; i++)
490 kvm_io_bus_destroy(kvm->buses[i]);
491 kvm_coalesced_mmio_free(kvm);
492 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
493 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
495 kvm_arch_flush_shadow(kvm);
497 kvm_arch_destroy_vm(kvm);
498 hardware_disable_all();
502 void kvm_get_kvm(struct kvm *kvm)
504 atomic_inc(&kvm->users_count);
506 EXPORT_SYMBOL_GPL(kvm_get_kvm);
508 void kvm_put_kvm(struct kvm *kvm)
510 if (atomic_dec_and_test(&kvm->users_count))
513 EXPORT_SYMBOL_GPL(kvm_put_kvm);
516 static int kvm_vm_release(struct inode *inode, struct file *filp)
518 struct kvm *kvm = filp->private_data;
520 kvm_irqfd_release(kvm);
527 * Allocate some memory and give it an address in the guest physical address
530 * Discontiguous memory is allowed, mostly for framebuffers.
532 * Must be called holding mmap_sem for write.
534 int __kvm_set_memory_region(struct kvm *kvm,
535 struct kvm_userspace_memory_region *mem,
538 int r, flush_shadow = 0;
540 unsigned long npages;
542 struct kvm_memory_slot *memslot;
543 struct kvm_memory_slot old, new;
544 struct kvm_memslots *slots, *old_memslots;
547 /* General sanity checks */
548 if (mem->memory_size & (PAGE_SIZE - 1))
550 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
552 if (user_alloc && (mem->userspace_addr & (PAGE_SIZE - 1)))
554 if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
556 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
559 memslot = &kvm->memslots->memslots[mem->slot];
560 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
561 npages = mem->memory_size >> PAGE_SHIFT;
564 if (npages > KVM_MEM_MAX_NR_PAGES)
568 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
570 new = old = *memslot;
572 new.base_gfn = base_gfn;
574 new.flags = mem->flags;
576 /* Disallow changing a memory slot's size. */
578 if (npages && old.npages && npages != old.npages)
581 /* Check for overlaps */
583 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
584 struct kvm_memory_slot *s = &kvm->memslots->memslots[i];
586 if (s == memslot || !s->npages)
588 if (!((base_gfn + npages <= s->base_gfn) ||
589 (base_gfn >= s->base_gfn + s->npages)))
593 /* Free page dirty bitmap if unneeded */
594 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
595 new.dirty_bitmap = NULL;
599 /* Allocate if a slot is being created */
601 if (npages && !new.rmap) {
602 new.rmap = vmalloc(npages * sizeof(struct page *));
607 memset(new.rmap, 0, npages * sizeof(*new.rmap));
609 new.user_alloc = user_alloc;
610 new.userspace_addr = mem->userspace_addr;
615 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
621 /* Avoid unused variable warning if no large pages */
624 if (new.lpage_info[i])
627 lpages = 1 + (base_gfn + npages - 1) /
628 KVM_PAGES_PER_HPAGE(level);
629 lpages -= base_gfn / KVM_PAGES_PER_HPAGE(level);
631 new.lpage_info[i] = vmalloc(lpages * sizeof(*new.lpage_info[i]));
633 if (!new.lpage_info[i])
636 memset(new.lpage_info[i], 0,
637 lpages * sizeof(*new.lpage_info[i]));
639 if (base_gfn % KVM_PAGES_PER_HPAGE(level))
640 new.lpage_info[i][0].write_count = 1;
641 if ((base_gfn+npages) % KVM_PAGES_PER_HPAGE(level))
642 new.lpage_info[i][lpages - 1].write_count = 1;
643 ugfn = new.userspace_addr >> PAGE_SHIFT;
645 * If the gfn and userspace address are not aligned wrt each
646 * other, or if explicitly asked to, disable large page
647 * support for this slot
649 if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
651 for (j = 0; j < lpages; ++j)
652 new.lpage_info[i][j].write_count = 1;
657 /* Allocate page dirty bitmap if needed */
658 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
659 unsigned long dirty_bytes = kvm_dirty_bitmap_bytes(&new);
661 new.dirty_bitmap = vmalloc(dirty_bytes);
662 if (!new.dirty_bitmap)
664 memset(new.dirty_bitmap, 0, dirty_bytes);
665 /* destroy any largepage mappings for dirty tracking */
669 #else /* not defined CONFIG_S390 */
670 new.user_alloc = user_alloc;
672 new.userspace_addr = mem->userspace_addr;
673 #endif /* not defined CONFIG_S390 */
677 slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
680 memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
681 if (mem->slot >= slots->nmemslots)
682 slots->nmemslots = mem->slot + 1;
683 slots->memslots[mem->slot].flags |= KVM_MEMSLOT_INVALID;
685 old_memslots = kvm->memslots;
686 rcu_assign_pointer(kvm->memslots, slots);
687 synchronize_srcu_expedited(&kvm->srcu);
688 /* From this point no new shadow pages pointing to a deleted
689 * memslot will be created.
691 * validation of sp->gfn happens in:
692 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
693 * - kvm_is_visible_gfn (mmu_check_roots)
695 kvm_arch_flush_shadow(kvm);
699 r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc);
704 /* map the pages in iommu page table */
706 r = kvm_iommu_map_pages(kvm, &new);
713 slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
716 memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
717 if (mem->slot >= slots->nmemslots)
718 slots->nmemslots = mem->slot + 1;
720 /* actual memory is freed via old in kvm_free_physmem_slot below */
723 new.dirty_bitmap = NULL;
724 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i)
725 new.lpage_info[i] = NULL;
728 slots->memslots[mem->slot] = new;
729 old_memslots = kvm->memslots;
730 rcu_assign_pointer(kvm->memslots, slots);
731 synchronize_srcu_expedited(&kvm->srcu);
733 kvm_arch_commit_memory_region(kvm, mem, old, user_alloc);
735 kvm_free_physmem_slot(&old, &new);
739 kvm_arch_flush_shadow(kvm);
744 kvm_free_physmem_slot(&new, &old);
749 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
751 int kvm_set_memory_region(struct kvm *kvm,
752 struct kvm_userspace_memory_region *mem,
757 mutex_lock(&kvm->slots_lock);
758 r = __kvm_set_memory_region(kvm, mem, user_alloc);
759 mutex_unlock(&kvm->slots_lock);
762 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
764 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
766 kvm_userspace_memory_region *mem,
769 if (mem->slot >= KVM_MEMORY_SLOTS)
771 return kvm_set_memory_region(kvm, mem, user_alloc);
774 int kvm_get_dirty_log(struct kvm *kvm,
775 struct kvm_dirty_log *log, int *is_dirty)
777 struct kvm_memory_slot *memslot;
780 unsigned long any = 0;
783 if (log->slot >= KVM_MEMORY_SLOTS)
786 memslot = &kvm->memslots->memslots[log->slot];
788 if (!memslot->dirty_bitmap)
791 n = kvm_dirty_bitmap_bytes(memslot);
793 for (i = 0; !any && i < n/sizeof(long); ++i)
794 any = memslot->dirty_bitmap[i];
797 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
808 void kvm_disable_largepages(void)
810 largepages_enabled = false;
812 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
814 int is_error_page(struct page *page)
816 return page == bad_page || page == hwpoison_page;
818 EXPORT_SYMBOL_GPL(is_error_page);
820 int is_error_pfn(pfn_t pfn)
822 return pfn == bad_pfn || pfn == hwpoison_pfn;
824 EXPORT_SYMBOL_GPL(is_error_pfn);
826 int is_hwpoison_pfn(pfn_t pfn)
828 return pfn == hwpoison_pfn;
830 EXPORT_SYMBOL_GPL(is_hwpoison_pfn);
832 static inline unsigned long bad_hva(void)
837 int kvm_is_error_hva(unsigned long addr)
839 return addr == bad_hva();
841 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
843 struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn)
846 struct kvm_memslots *slots = kvm_memslots(kvm);
848 for (i = 0; i < slots->nmemslots; ++i) {
849 struct kvm_memory_slot *memslot = &slots->memslots[i];
851 if (gfn >= memslot->base_gfn
852 && gfn < memslot->base_gfn + memslot->npages)
857 EXPORT_SYMBOL_GPL(gfn_to_memslot_unaliased);
859 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
861 gfn = unalias_gfn(kvm, gfn);
862 return gfn_to_memslot_unaliased(kvm, gfn);
865 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
868 struct kvm_memslots *slots = kvm_memslots(kvm);
870 gfn = unalias_gfn_instantiation(kvm, gfn);
871 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
872 struct kvm_memory_slot *memslot = &slots->memslots[i];
874 if (memslot->flags & KVM_MEMSLOT_INVALID)
877 if (gfn >= memslot->base_gfn
878 && gfn < memslot->base_gfn + memslot->npages)
883 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
885 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
887 struct vm_area_struct *vma;
888 unsigned long addr, size;
892 addr = gfn_to_hva(kvm, gfn);
893 if (kvm_is_error_hva(addr))
896 down_read(¤t->mm->mmap_sem);
897 vma = find_vma(current->mm, addr);
901 size = vma_kernel_pagesize(vma);
904 up_read(¤t->mm->mmap_sem);
909 int memslot_id(struct kvm *kvm, gfn_t gfn)
912 struct kvm_memslots *slots = kvm_memslots(kvm);
913 struct kvm_memory_slot *memslot = NULL;
915 gfn = unalias_gfn(kvm, gfn);
916 for (i = 0; i < slots->nmemslots; ++i) {
917 memslot = &slots->memslots[i];
919 if (gfn >= memslot->base_gfn
920 && gfn < memslot->base_gfn + memslot->npages)
924 return memslot - slots->memslots;
927 static unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
929 return slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE;
932 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
934 struct kvm_memory_slot *slot;
936 gfn = unalias_gfn_instantiation(kvm, gfn);
937 slot = gfn_to_memslot_unaliased(kvm, gfn);
938 if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
940 return gfn_to_hva_memslot(slot, gfn);
942 EXPORT_SYMBOL_GPL(gfn_to_hva);
944 static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr)
946 struct page *page[1];
952 npages = get_user_pages_fast(addr, 1, 1, page);
954 if (unlikely(npages != 1)) {
955 struct vm_area_struct *vma;
957 if (is_hwpoison_address(addr)) {
958 get_page(hwpoison_page);
959 return page_to_pfn(hwpoison_page);
962 down_read(¤t->mm->mmap_sem);
963 vma = find_vma(current->mm, addr);
965 if (vma == NULL || addr < vma->vm_start ||
966 !(vma->vm_flags & VM_PFNMAP)) {
967 up_read(¤t->mm->mmap_sem);
969 return page_to_pfn(bad_page);
972 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
973 up_read(¤t->mm->mmap_sem);
974 BUG_ON(!kvm_is_mmio_pfn(pfn));
976 pfn = page_to_pfn(page[0]);
981 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
985 addr = gfn_to_hva(kvm, gfn);
986 if (kvm_is_error_hva(addr)) {
988 return page_to_pfn(bad_page);
991 return hva_to_pfn(kvm, addr);
993 EXPORT_SYMBOL_GPL(gfn_to_pfn);
995 pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
996 struct kvm_memory_slot *slot, gfn_t gfn)
998 unsigned long addr = gfn_to_hva_memslot(slot, gfn);
999 return hva_to_pfn(kvm, addr);
1002 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1006 pfn = gfn_to_pfn(kvm, gfn);
1007 if (!kvm_is_mmio_pfn(pfn))
1008 return pfn_to_page(pfn);
1010 WARN_ON(kvm_is_mmio_pfn(pfn));
1016 EXPORT_SYMBOL_GPL(gfn_to_page);
1018 void kvm_release_page_clean(struct page *page)
1020 kvm_release_pfn_clean(page_to_pfn(page));
1022 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1024 void kvm_release_pfn_clean(pfn_t pfn)
1026 if (!kvm_is_mmio_pfn(pfn))
1027 put_page(pfn_to_page(pfn));
1029 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1031 void kvm_release_page_dirty(struct page *page)
1033 kvm_release_pfn_dirty(page_to_pfn(page));
1035 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1037 void kvm_release_pfn_dirty(pfn_t pfn)
1039 kvm_set_pfn_dirty(pfn);
1040 kvm_release_pfn_clean(pfn);
1042 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1044 void kvm_set_page_dirty(struct page *page)
1046 kvm_set_pfn_dirty(page_to_pfn(page));
1048 EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
1050 void kvm_set_pfn_dirty(pfn_t pfn)
1052 if (!kvm_is_mmio_pfn(pfn)) {
1053 struct page *page = pfn_to_page(pfn);
1054 if (!PageReserved(page))
1058 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1060 void kvm_set_pfn_accessed(pfn_t pfn)
1062 if (!kvm_is_mmio_pfn(pfn))
1063 mark_page_accessed(pfn_to_page(pfn));
1065 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1067 void kvm_get_pfn(pfn_t pfn)
1069 if (!kvm_is_mmio_pfn(pfn))
1070 get_page(pfn_to_page(pfn));
1072 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1074 static int next_segment(unsigned long len, int offset)
1076 if (len > PAGE_SIZE - offset)
1077 return PAGE_SIZE - offset;
1082 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1088 addr = gfn_to_hva(kvm, gfn);
1089 if (kvm_is_error_hva(addr))
1091 r = copy_from_user(data, (void __user *)addr + offset, len);
1096 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1098 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1100 gfn_t gfn = gpa >> PAGE_SHIFT;
1102 int offset = offset_in_page(gpa);
1105 while ((seg = next_segment(len, offset)) != 0) {
1106 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1116 EXPORT_SYMBOL_GPL(kvm_read_guest);
1118 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1123 gfn_t gfn = gpa >> PAGE_SHIFT;
1124 int offset = offset_in_page(gpa);
1126 addr = gfn_to_hva(kvm, gfn);
1127 if (kvm_is_error_hva(addr))
1129 pagefault_disable();
1130 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1136 EXPORT_SYMBOL(kvm_read_guest_atomic);
1138 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1139 int offset, int len)
1144 addr = gfn_to_hva(kvm, gfn);
1145 if (kvm_is_error_hva(addr))
1147 r = copy_to_user((void __user *)addr + offset, data, len);
1150 mark_page_dirty(kvm, gfn);
1153 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1155 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1158 gfn_t gfn = gpa >> PAGE_SHIFT;
1160 int offset = offset_in_page(gpa);
1163 while ((seg = next_segment(len, offset)) != 0) {
1164 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1175 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1177 return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len);
1179 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1181 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1183 gfn_t gfn = gpa >> PAGE_SHIFT;
1185 int offset = offset_in_page(gpa);
1188 while ((seg = next_segment(len, offset)) != 0) {
1189 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1198 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1200 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1202 struct kvm_memory_slot *memslot;
1204 gfn = unalias_gfn(kvm, gfn);
1205 memslot = gfn_to_memslot_unaliased(kvm, gfn);
1206 if (memslot && memslot->dirty_bitmap) {
1207 unsigned long rel_gfn = gfn - memslot->base_gfn;
1209 generic___set_le_bit(rel_gfn, memslot->dirty_bitmap);
1214 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1216 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1221 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1223 if (kvm_arch_vcpu_runnable(vcpu)) {
1224 set_bit(KVM_REQ_UNHALT, &vcpu->requests);
1227 if (kvm_cpu_has_pending_timer(vcpu))
1229 if (signal_pending(current))
1235 finish_wait(&vcpu->wq, &wait);
1238 void kvm_resched(struct kvm_vcpu *vcpu)
1240 if (!need_resched())
1244 EXPORT_SYMBOL_GPL(kvm_resched);
1246 void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu)
1251 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1253 /* Sleep for 100 us, and hope lock-holder got scheduled */
1254 expires = ktime_add_ns(ktime_get(), 100000UL);
1255 schedule_hrtimeout(&expires, HRTIMER_MODE_ABS);
1257 finish_wait(&vcpu->wq, &wait);
1259 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
1261 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1263 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1266 if (vmf->pgoff == 0)
1267 page = virt_to_page(vcpu->run);
1269 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
1270 page = virt_to_page(vcpu->arch.pio_data);
1272 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1273 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1274 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1277 return VM_FAULT_SIGBUS;
1283 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
1284 .fault = kvm_vcpu_fault,
1287 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1289 vma->vm_ops = &kvm_vcpu_vm_ops;
1293 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1295 struct kvm_vcpu *vcpu = filp->private_data;
1297 kvm_put_kvm(vcpu->kvm);
1301 static struct file_operations kvm_vcpu_fops = {
1302 .release = kvm_vcpu_release,
1303 .unlocked_ioctl = kvm_vcpu_ioctl,
1304 .compat_ioctl = kvm_vcpu_ioctl,
1305 .mmap = kvm_vcpu_mmap,
1309 * Allocates an inode for the vcpu.
1311 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1313 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR);
1317 * Creates some virtual cpus. Good luck creating more than one.
1319 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
1322 struct kvm_vcpu *vcpu, *v;
1324 vcpu = kvm_arch_vcpu_create(kvm, id);
1326 return PTR_ERR(vcpu);
1328 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1330 r = kvm_arch_vcpu_setup(vcpu);
1334 mutex_lock(&kvm->lock);
1335 if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
1340 kvm_for_each_vcpu(r, v, kvm)
1341 if (v->vcpu_id == id) {
1346 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
1348 /* Now it's all set up, let userspace reach it */
1350 r = create_vcpu_fd(vcpu);
1356 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
1358 atomic_inc(&kvm->online_vcpus);
1360 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1361 if (kvm->bsp_vcpu_id == id)
1362 kvm->bsp_vcpu = vcpu;
1364 mutex_unlock(&kvm->lock);
1368 mutex_unlock(&kvm->lock);
1369 kvm_arch_vcpu_destroy(vcpu);
1373 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1376 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1377 vcpu->sigset_active = 1;
1378 vcpu->sigset = *sigset;
1380 vcpu->sigset_active = 0;
1384 static long kvm_vcpu_ioctl(struct file *filp,
1385 unsigned int ioctl, unsigned long arg)
1387 struct kvm_vcpu *vcpu = filp->private_data;
1388 void __user *argp = (void __user *)arg;
1390 struct kvm_fpu *fpu = NULL;
1391 struct kvm_sregs *kvm_sregs = NULL;
1393 if (vcpu->kvm->mm != current->mm)
1396 #if defined(CONFIG_S390) || defined(CONFIG_PPC)
1398 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1399 * so vcpu_load() would break it.
1401 if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT)
1402 return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1412 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
1414 case KVM_GET_REGS: {
1415 struct kvm_regs *kvm_regs;
1418 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1421 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
1425 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1432 case KVM_SET_REGS: {
1433 struct kvm_regs *kvm_regs;
1436 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1440 if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs)))
1442 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
1450 case KVM_GET_SREGS: {
1451 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1455 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
1459 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
1464 case KVM_SET_SREGS: {
1465 kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1470 if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs)))
1472 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
1478 case KVM_GET_MP_STATE: {
1479 struct kvm_mp_state mp_state;
1481 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
1485 if (copy_to_user(argp, &mp_state, sizeof mp_state))
1490 case KVM_SET_MP_STATE: {
1491 struct kvm_mp_state mp_state;
1494 if (copy_from_user(&mp_state, argp, sizeof mp_state))
1496 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
1502 case KVM_TRANSLATE: {
1503 struct kvm_translation tr;
1506 if (copy_from_user(&tr, argp, sizeof tr))
1508 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
1512 if (copy_to_user(argp, &tr, sizeof tr))
1517 case KVM_SET_GUEST_DEBUG: {
1518 struct kvm_guest_debug dbg;
1521 if (copy_from_user(&dbg, argp, sizeof dbg))
1523 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
1529 case KVM_SET_SIGNAL_MASK: {
1530 struct kvm_signal_mask __user *sigmask_arg = argp;
1531 struct kvm_signal_mask kvm_sigmask;
1532 sigset_t sigset, *p;
1537 if (copy_from_user(&kvm_sigmask, argp,
1538 sizeof kvm_sigmask))
1541 if (kvm_sigmask.len != sizeof sigset)
1544 if (copy_from_user(&sigset, sigmask_arg->sigset,
1549 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
1553 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1557 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
1561 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
1567 fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1572 if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu)))
1574 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
1582 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1592 static long kvm_vm_ioctl(struct file *filp,
1593 unsigned int ioctl, unsigned long arg)
1595 struct kvm *kvm = filp->private_data;
1596 void __user *argp = (void __user *)arg;
1599 if (kvm->mm != current->mm)
1602 case KVM_CREATE_VCPU:
1603 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
1607 case KVM_SET_USER_MEMORY_REGION: {
1608 struct kvm_userspace_memory_region kvm_userspace_mem;
1611 if (copy_from_user(&kvm_userspace_mem, argp,
1612 sizeof kvm_userspace_mem))
1615 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
1620 case KVM_GET_DIRTY_LOG: {
1621 struct kvm_dirty_log log;
1624 if (copy_from_user(&log, argp, sizeof log))
1626 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
1631 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1632 case KVM_REGISTER_COALESCED_MMIO: {
1633 struct kvm_coalesced_mmio_zone zone;
1635 if (copy_from_user(&zone, argp, sizeof zone))
1637 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
1643 case KVM_UNREGISTER_COALESCED_MMIO: {
1644 struct kvm_coalesced_mmio_zone zone;
1646 if (copy_from_user(&zone, argp, sizeof zone))
1648 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
1656 struct kvm_irqfd data;
1659 if (copy_from_user(&data, argp, sizeof data))
1661 r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags);
1664 case KVM_IOEVENTFD: {
1665 struct kvm_ioeventfd data;
1668 if (copy_from_user(&data, argp, sizeof data))
1670 r = kvm_ioeventfd(kvm, &data);
1673 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1674 case KVM_SET_BOOT_CPU_ID:
1676 mutex_lock(&kvm->lock);
1677 if (atomic_read(&kvm->online_vcpus) != 0)
1680 kvm->bsp_vcpu_id = arg;
1681 mutex_unlock(&kvm->lock);
1685 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
1687 r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
1693 #ifdef CONFIG_COMPAT
1694 struct compat_kvm_dirty_log {
1698 compat_uptr_t dirty_bitmap; /* one bit per page */
1703 static long kvm_vm_compat_ioctl(struct file *filp,
1704 unsigned int ioctl, unsigned long arg)
1706 struct kvm *kvm = filp->private_data;
1709 if (kvm->mm != current->mm)
1712 case KVM_GET_DIRTY_LOG: {
1713 struct compat_kvm_dirty_log compat_log;
1714 struct kvm_dirty_log log;
1717 if (copy_from_user(&compat_log, (void __user *)arg,
1718 sizeof(compat_log)))
1720 log.slot = compat_log.slot;
1721 log.padding1 = compat_log.padding1;
1722 log.padding2 = compat_log.padding2;
1723 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
1725 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
1731 r = kvm_vm_ioctl(filp, ioctl, arg);
1739 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1741 struct page *page[1];
1744 gfn_t gfn = vmf->pgoff;
1745 struct kvm *kvm = vma->vm_file->private_data;
1747 addr = gfn_to_hva(kvm, gfn);
1748 if (kvm_is_error_hva(addr))
1749 return VM_FAULT_SIGBUS;
1751 npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
1753 if (unlikely(npages != 1))
1754 return VM_FAULT_SIGBUS;
1756 vmf->page = page[0];
1760 static const struct vm_operations_struct kvm_vm_vm_ops = {
1761 .fault = kvm_vm_fault,
1764 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
1766 vma->vm_ops = &kvm_vm_vm_ops;
1770 static struct file_operations kvm_vm_fops = {
1771 .release = kvm_vm_release,
1772 .unlocked_ioctl = kvm_vm_ioctl,
1773 #ifdef CONFIG_COMPAT
1774 .compat_ioctl = kvm_vm_compat_ioctl,
1776 .mmap = kvm_vm_mmap,
1779 static int kvm_dev_ioctl_create_vm(void)
1784 kvm = kvm_create_vm();
1786 return PTR_ERR(kvm);
1787 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1788 r = kvm_coalesced_mmio_init(kvm);
1794 fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
1801 static long kvm_dev_ioctl_check_extension_generic(long arg)
1804 case KVM_CAP_USER_MEMORY:
1805 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
1806 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
1807 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1808 case KVM_CAP_SET_BOOT_CPU_ID:
1810 case KVM_CAP_INTERNAL_ERROR_DATA:
1812 #ifdef CONFIG_HAVE_KVM_IRQCHIP
1813 case KVM_CAP_IRQ_ROUTING:
1814 return KVM_MAX_IRQ_ROUTES;
1819 return kvm_dev_ioctl_check_extension(arg);
1822 static long kvm_dev_ioctl(struct file *filp,
1823 unsigned int ioctl, unsigned long arg)
1828 case KVM_GET_API_VERSION:
1832 r = KVM_API_VERSION;
1838 r = kvm_dev_ioctl_create_vm();
1840 case KVM_CHECK_EXTENSION:
1841 r = kvm_dev_ioctl_check_extension_generic(arg);
1843 case KVM_GET_VCPU_MMAP_SIZE:
1847 r = PAGE_SIZE; /* struct kvm_run */
1849 r += PAGE_SIZE; /* pio data page */
1851 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1852 r += PAGE_SIZE; /* coalesced mmio ring page */
1855 case KVM_TRACE_ENABLE:
1856 case KVM_TRACE_PAUSE:
1857 case KVM_TRACE_DISABLE:
1861 return kvm_arch_dev_ioctl(filp, ioctl, arg);
1867 static struct file_operations kvm_chardev_ops = {
1868 .unlocked_ioctl = kvm_dev_ioctl,
1869 .compat_ioctl = kvm_dev_ioctl,
1872 static struct miscdevice kvm_dev = {
1878 static void hardware_enable(void *junk)
1880 int cpu = raw_smp_processor_id();
1883 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
1886 cpumask_set_cpu(cpu, cpus_hardware_enabled);
1888 r = kvm_arch_hardware_enable(NULL);
1891 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
1892 atomic_inc(&hardware_enable_failed);
1893 printk(KERN_INFO "kvm: enabling virtualization on "
1894 "CPU%d failed\n", cpu);
1898 static void hardware_disable(void *junk)
1900 int cpu = raw_smp_processor_id();
1902 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
1904 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
1905 kvm_arch_hardware_disable(NULL);
1908 static void hardware_disable_all_nolock(void)
1910 BUG_ON(!kvm_usage_count);
1913 if (!kvm_usage_count)
1914 on_each_cpu(hardware_disable, NULL, 1);
1917 static void hardware_disable_all(void)
1919 spin_lock(&kvm_lock);
1920 hardware_disable_all_nolock();
1921 spin_unlock(&kvm_lock);
1924 static int hardware_enable_all(void)
1928 spin_lock(&kvm_lock);
1931 if (kvm_usage_count == 1) {
1932 atomic_set(&hardware_enable_failed, 0);
1933 on_each_cpu(hardware_enable, NULL, 1);
1935 if (atomic_read(&hardware_enable_failed)) {
1936 hardware_disable_all_nolock();
1941 spin_unlock(&kvm_lock);
1946 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
1951 if (!kvm_usage_count)
1954 val &= ~CPU_TASKS_FROZEN;
1957 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
1959 hardware_disable(NULL);
1962 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
1964 smp_call_function_single(cpu, hardware_enable, NULL, 1);
1971 asmlinkage void kvm_handle_fault_on_reboot(void)
1974 /* spin while reset goes on */
1977 /* Fault while not rebooting. We want the trace. */
1980 EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot);
1982 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
1986 * Some (well, at least mine) BIOSes hang on reboot if
1989 * And Intel TXT required VMX off for all cpu when system shutdown.
1991 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
1992 kvm_rebooting = true;
1993 on_each_cpu(hardware_disable, NULL, 1);
1997 static struct notifier_block kvm_reboot_notifier = {
1998 .notifier_call = kvm_reboot,
2002 static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
2006 for (i = 0; i < bus->dev_count; i++) {
2007 struct kvm_io_device *pos = bus->devs[i];
2009 kvm_iodevice_destructor(pos);
2014 /* kvm_io_bus_write - called under kvm->slots_lock */
2015 int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2016 int len, const void *val)
2019 struct kvm_io_bus *bus;
2021 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2022 for (i = 0; i < bus->dev_count; i++)
2023 if (!kvm_iodevice_write(bus->devs[i], addr, len, val))
2028 /* kvm_io_bus_read - called under kvm->slots_lock */
2029 int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2033 struct kvm_io_bus *bus;
2035 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2036 for (i = 0; i < bus->dev_count; i++)
2037 if (!kvm_iodevice_read(bus->devs[i], addr, len, val))
2042 /* Caller must hold slots_lock. */
2043 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2044 struct kvm_io_device *dev)
2046 struct kvm_io_bus *new_bus, *bus;
2048 bus = kvm->buses[bus_idx];
2049 if (bus->dev_count > NR_IOBUS_DEVS-1)
2052 new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL);
2055 memcpy(new_bus, bus, sizeof(struct kvm_io_bus));
2056 new_bus->devs[new_bus->dev_count++] = dev;
2057 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2058 synchronize_srcu_expedited(&kvm->srcu);
2064 /* Caller must hold slots_lock. */
2065 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2066 struct kvm_io_device *dev)
2069 struct kvm_io_bus *new_bus, *bus;
2071 new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL);
2075 bus = kvm->buses[bus_idx];
2076 memcpy(new_bus, bus, sizeof(struct kvm_io_bus));
2079 for (i = 0; i < new_bus->dev_count; i++)
2080 if (new_bus->devs[i] == dev) {
2082 new_bus->devs[i] = new_bus->devs[--new_bus->dev_count];
2091 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2092 synchronize_srcu_expedited(&kvm->srcu);
2097 static struct notifier_block kvm_cpu_notifier = {
2098 .notifier_call = kvm_cpu_hotplug,
2099 .priority = 20, /* must be > scheduler priority */
2102 static int vm_stat_get(void *_offset, u64 *val)
2104 unsigned offset = (long)_offset;
2108 spin_lock(&kvm_lock);
2109 list_for_each_entry(kvm, &vm_list, vm_list)
2110 *val += *(u32 *)((void *)kvm + offset);
2111 spin_unlock(&kvm_lock);
2115 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
2117 static int vcpu_stat_get(void *_offset, u64 *val)
2119 unsigned offset = (long)_offset;
2121 struct kvm_vcpu *vcpu;
2125 spin_lock(&kvm_lock);
2126 list_for_each_entry(kvm, &vm_list, vm_list)
2127 kvm_for_each_vcpu(i, vcpu, kvm)
2128 *val += *(u32 *)((void *)vcpu + offset);
2130 spin_unlock(&kvm_lock);
2134 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
2136 static const struct file_operations *stat_fops[] = {
2137 [KVM_STAT_VCPU] = &vcpu_stat_fops,
2138 [KVM_STAT_VM] = &vm_stat_fops,
2141 static void kvm_init_debug(void)
2143 struct kvm_stats_debugfs_item *p;
2145 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
2146 for (p = debugfs_entries; p->name; ++p)
2147 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
2148 (void *)(long)p->offset,
2149 stat_fops[p->kind]);
2152 static void kvm_exit_debug(void)
2154 struct kvm_stats_debugfs_item *p;
2156 for (p = debugfs_entries; p->name; ++p)
2157 debugfs_remove(p->dentry);
2158 debugfs_remove(kvm_debugfs_dir);
2161 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
2163 if (kvm_usage_count)
2164 hardware_disable(NULL);
2168 static int kvm_resume(struct sys_device *dev)
2170 if (kvm_usage_count)
2171 hardware_enable(NULL);
2175 static struct sysdev_class kvm_sysdev_class = {
2177 .suspend = kvm_suspend,
2178 .resume = kvm_resume,
2181 static struct sys_device kvm_sysdev = {
2183 .cls = &kvm_sysdev_class,
2186 struct page *bad_page;
2190 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
2192 return container_of(pn, struct kvm_vcpu, preempt_notifier);
2195 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
2197 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2199 kvm_arch_vcpu_load(vcpu, cpu);
2202 static void kvm_sched_out(struct preempt_notifier *pn,
2203 struct task_struct *next)
2205 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2207 kvm_arch_vcpu_put(vcpu);
2210 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
2211 struct module *module)
2216 r = kvm_arch_init(opaque);
2220 bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2222 if (bad_page == NULL) {
2227 bad_pfn = page_to_pfn(bad_page);
2229 hwpoison_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2231 if (hwpoison_page == NULL) {
2236 hwpoison_pfn = page_to_pfn(hwpoison_page);
2238 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
2243 r = kvm_arch_hardware_setup();
2247 for_each_online_cpu(cpu) {
2248 smp_call_function_single(cpu,
2249 kvm_arch_check_processor_compat,
2255 r = register_cpu_notifier(&kvm_cpu_notifier);
2258 register_reboot_notifier(&kvm_reboot_notifier);
2260 r = sysdev_class_register(&kvm_sysdev_class);
2264 r = sysdev_register(&kvm_sysdev);
2268 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2270 vcpu_align = __alignof__(struct kvm_vcpu);
2271 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
2273 if (!kvm_vcpu_cache) {
2278 kvm_chardev_ops.owner = module;
2279 kvm_vm_fops.owner = module;
2280 kvm_vcpu_fops.owner = module;
2282 r = misc_register(&kvm_dev);
2284 printk(KERN_ERR "kvm: misc device register failed\n");
2288 kvm_preempt_ops.sched_in = kvm_sched_in;
2289 kvm_preempt_ops.sched_out = kvm_sched_out;
2296 kmem_cache_destroy(kvm_vcpu_cache);
2298 sysdev_unregister(&kvm_sysdev);
2300 sysdev_class_unregister(&kvm_sysdev_class);
2302 unregister_reboot_notifier(&kvm_reboot_notifier);
2303 unregister_cpu_notifier(&kvm_cpu_notifier);
2306 kvm_arch_hardware_unsetup();
2308 free_cpumask_var(cpus_hardware_enabled);
2311 __free_page(hwpoison_page);
2312 __free_page(bad_page);
2318 EXPORT_SYMBOL_GPL(kvm_init);
2323 misc_deregister(&kvm_dev);
2324 kmem_cache_destroy(kvm_vcpu_cache);
2325 sysdev_unregister(&kvm_sysdev);
2326 sysdev_class_unregister(&kvm_sysdev_class);
2327 unregister_reboot_notifier(&kvm_reboot_notifier);
2328 unregister_cpu_notifier(&kvm_cpu_notifier);
2329 on_each_cpu(hardware_disable, NULL, 1);
2330 kvm_arch_hardware_unsetup();
2332 free_cpumask_var(cpus_hardware_enabled);
2333 __free_page(hwpoison_page);
2334 __free_page(bad_page);
2336 EXPORT_SYMBOL_GPL(kvm_exit);