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>
25 #include <linux/gfp.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>
49 #include <asm/processor.h>
51 #include <asm/uaccess.h>
52 #include <asm/pgtable.h>
53 #include <asm-generic/bitops/le.h>
55 #include "coalesced_mmio.h"
57 #define CREATE_TRACE_POINTS
58 #include <trace/events/kvm.h>
60 MODULE_AUTHOR("Qumranet");
61 MODULE_LICENSE("GPL");
66 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
69 DEFINE_SPINLOCK(kvm_lock);
72 static cpumask_var_t cpus_hardware_enabled;
73 static int kvm_usage_count = 0;
74 static atomic_t hardware_enable_failed;
76 struct kmem_cache *kvm_vcpu_cache;
77 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
79 static __read_mostly struct preempt_ops kvm_preempt_ops;
81 struct dentry *kvm_debugfs_dir;
83 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
85 static int hardware_enable_all(void);
86 static void hardware_disable_all(void);
88 static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
90 static bool kvm_rebooting;
92 static bool largepages_enabled = true;
94 inline int kvm_is_mmio_pfn(pfn_t pfn)
97 struct page *page = compound_head(pfn_to_page(pfn));
98 return PageReserved(page);
105 * Switches to specified vcpu, until a matching vcpu_put()
107 void vcpu_load(struct kvm_vcpu *vcpu)
111 mutex_lock(&vcpu->mutex);
113 preempt_notifier_register(&vcpu->preempt_notifier);
114 kvm_arch_vcpu_load(vcpu, cpu);
118 void vcpu_put(struct kvm_vcpu *vcpu)
121 kvm_arch_vcpu_put(vcpu);
122 preempt_notifier_unregister(&vcpu->preempt_notifier);
124 mutex_unlock(&vcpu->mutex);
127 static void ack_flush(void *_completed)
131 static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
136 struct kvm_vcpu *vcpu;
138 zalloc_cpumask_var(&cpus, GFP_ATOMIC);
140 spin_lock(&kvm->requests_lock);
141 me = smp_processor_id();
142 kvm_for_each_vcpu(i, vcpu, kvm) {
143 if (test_and_set_bit(req, &vcpu->requests))
146 if (cpus != NULL && cpu != -1 && cpu != me)
147 cpumask_set_cpu(cpu, cpus);
149 if (unlikely(cpus == NULL))
150 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
151 else if (!cpumask_empty(cpus))
152 smp_call_function_many(cpus, ack_flush, NULL, 1);
155 spin_unlock(&kvm->requests_lock);
156 free_cpumask_var(cpus);
160 void kvm_flush_remote_tlbs(struct kvm *kvm)
162 if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
163 ++kvm->stat.remote_tlb_flush;
166 void kvm_reload_remote_mmus(struct kvm *kvm)
168 make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
171 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
176 mutex_init(&vcpu->mutex);
180 init_waitqueue_head(&vcpu->wq);
182 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
187 vcpu->run = page_address(page);
189 r = kvm_arch_vcpu_init(vcpu);
195 free_page((unsigned long)vcpu->run);
199 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
201 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
203 kvm_arch_vcpu_uninit(vcpu);
204 free_page((unsigned long)vcpu->run);
206 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
208 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
209 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
211 return container_of(mn, struct kvm, mmu_notifier);
214 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
215 struct mm_struct *mm,
216 unsigned long address)
218 struct kvm *kvm = mmu_notifier_to_kvm(mn);
219 int need_tlb_flush, idx;
222 * When ->invalidate_page runs, the linux pte has been zapped
223 * already but the page is still allocated until
224 * ->invalidate_page returns. So if we increase the sequence
225 * here the kvm page fault will notice if the spte can't be
226 * established because the page is going to be freed. If
227 * instead the kvm page fault establishes the spte before
228 * ->invalidate_page runs, kvm_unmap_hva will release it
231 * The sequence increase only need to be seen at spin_unlock
232 * time, and not at spin_lock time.
234 * Increasing the sequence after the spin_unlock would be
235 * unsafe because the kvm page fault could then establish the
236 * pte after kvm_unmap_hva returned, without noticing the page
237 * is going to be freed.
239 idx = srcu_read_lock(&kvm->srcu);
240 spin_lock(&kvm->mmu_lock);
241 kvm->mmu_notifier_seq++;
242 need_tlb_flush = kvm_unmap_hva(kvm, address);
243 spin_unlock(&kvm->mmu_lock);
244 srcu_read_unlock(&kvm->srcu, idx);
246 /* we've to flush the tlb before the pages can be freed */
248 kvm_flush_remote_tlbs(kvm);
252 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
253 struct mm_struct *mm,
254 unsigned long address,
257 struct kvm *kvm = mmu_notifier_to_kvm(mn);
260 idx = srcu_read_lock(&kvm->srcu);
261 spin_lock(&kvm->mmu_lock);
262 kvm->mmu_notifier_seq++;
263 kvm_set_spte_hva(kvm, address, pte);
264 spin_unlock(&kvm->mmu_lock);
265 srcu_read_unlock(&kvm->srcu, idx);
268 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
269 struct mm_struct *mm,
273 struct kvm *kvm = mmu_notifier_to_kvm(mn);
274 int need_tlb_flush = 0, idx;
276 idx = srcu_read_lock(&kvm->srcu);
277 spin_lock(&kvm->mmu_lock);
279 * The count increase must become visible at unlock time as no
280 * spte can be established without taking the mmu_lock and
281 * count is also read inside the mmu_lock critical section.
283 kvm->mmu_notifier_count++;
284 for (; start < end; start += PAGE_SIZE)
285 need_tlb_flush |= kvm_unmap_hva(kvm, start);
286 spin_unlock(&kvm->mmu_lock);
287 srcu_read_unlock(&kvm->srcu, idx);
289 /* we've to flush the tlb before the pages can be freed */
291 kvm_flush_remote_tlbs(kvm);
294 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
295 struct mm_struct *mm,
299 struct kvm *kvm = mmu_notifier_to_kvm(mn);
301 spin_lock(&kvm->mmu_lock);
303 * This sequence increase will notify the kvm page fault that
304 * the page that is going to be mapped in the spte could have
307 kvm->mmu_notifier_seq++;
309 * The above sequence increase must be visible before the
310 * below count decrease but both values are read by the kvm
311 * page fault under mmu_lock spinlock so we don't need to add
312 * a smb_wmb() here in between the two.
314 kvm->mmu_notifier_count--;
315 spin_unlock(&kvm->mmu_lock);
317 BUG_ON(kvm->mmu_notifier_count < 0);
320 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
321 struct mm_struct *mm,
322 unsigned long address)
324 struct kvm *kvm = mmu_notifier_to_kvm(mn);
327 idx = srcu_read_lock(&kvm->srcu);
328 spin_lock(&kvm->mmu_lock);
329 young = kvm_age_hva(kvm, address);
330 spin_unlock(&kvm->mmu_lock);
331 srcu_read_unlock(&kvm->srcu, idx);
334 kvm_flush_remote_tlbs(kvm);
339 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
340 struct mm_struct *mm)
342 struct kvm *kvm = mmu_notifier_to_kvm(mn);
343 kvm_arch_flush_shadow(kvm);
346 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
347 .invalidate_page = kvm_mmu_notifier_invalidate_page,
348 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
349 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
350 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
351 .change_pte = kvm_mmu_notifier_change_pte,
352 .release = kvm_mmu_notifier_release,
355 static int kvm_init_mmu_notifier(struct kvm *kvm)
357 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
358 return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
361 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
363 static int kvm_init_mmu_notifier(struct kvm *kvm)
368 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
370 static struct kvm *kvm_create_vm(void)
373 struct kvm *kvm = kvm_arch_create_vm();
374 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
381 r = hardware_enable_all();
383 goto out_err_nodisable;
385 #ifdef CONFIG_HAVE_KVM_IRQCHIP
386 INIT_HLIST_HEAD(&kvm->mask_notifier_list);
387 INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
391 kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
394 if (init_srcu_struct(&kvm->srcu))
396 for (i = 0; i < KVM_NR_BUSES; i++) {
397 kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus),
399 if (!kvm->buses[i]) {
400 cleanup_srcu_struct(&kvm->srcu);
405 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
406 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
408 cleanup_srcu_struct(&kvm->srcu);
412 kvm->coalesced_mmio_ring =
413 (struct kvm_coalesced_mmio_ring *)page_address(page);
416 r = kvm_init_mmu_notifier(kvm);
418 cleanup_srcu_struct(&kvm->srcu);
419 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
425 kvm->mm = current->mm;
426 atomic_inc(&kvm->mm->mm_count);
427 spin_lock_init(&kvm->mmu_lock);
428 spin_lock_init(&kvm->requests_lock);
429 kvm_eventfd_init(kvm);
430 mutex_init(&kvm->lock);
431 mutex_init(&kvm->irq_lock);
432 init_rwsem(&kvm->slots_lock);
433 atomic_set(&kvm->users_count, 1);
434 spin_lock(&kvm_lock);
435 list_add(&kvm->vm_list, &vm_list);
436 spin_unlock(&kvm_lock);
437 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
438 kvm_coalesced_mmio_init(kvm);
444 hardware_disable_all();
446 for (i = 0; i < KVM_NR_BUSES; i++)
447 kfree(kvm->buses[i]);
448 kfree(kvm->memslots);
454 * Free any memory in @free but not in @dont.
456 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
457 struct kvm_memory_slot *dont)
461 if (!dont || free->rmap != dont->rmap)
464 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
465 vfree(free->dirty_bitmap);
468 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
469 if (!dont || free->lpage_info[i] != dont->lpage_info[i]) {
470 vfree(free->lpage_info[i]);
471 free->lpage_info[i] = NULL;
476 free->dirty_bitmap = NULL;
480 void kvm_free_physmem(struct kvm *kvm)
483 struct kvm_memslots *slots = kvm->memslots;
485 for (i = 0; i < slots->nmemslots; ++i)
486 kvm_free_physmem_slot(&slots->memslots[i], NULL);
488 kfree(kvm->memslots);
491 static void kvm_destroy_vm(struct kvm *kvm)
494 struct mm_struct *mm = kvm->mm;
496 kvm_arch_sync_events(kvm);
497 spin_lock(&kvm_lock);
498 list_del(&kvm->vm_list);
499 spin_unlock(&kvm_lock);
500 kvm_free_irq_routing(kvm);
501 for (i = 0; i < KVM_NR_BUSES; i++)
502 kvm_io_bus_destroy(kvm->buses[i]);
503 kvm_coalesced_mmio_free(kvm);
504 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
505 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
507 kvm_arch_flush_shadow(kvm);
509 cleanup_srcu_struct(&kvm->srcu);
510 kvm_arch_destroy_vm(kvm);
511 hardware_disable_all();
515 void kvm_get_kvm(struct kvm *kvm)
517 atomic_inc(&kvm->users_count);
519 EXPORT_SYMBOL_GPL(kvm_get_kvm);
521 void kvm_put_kvm(struct kvm *kvm)
523 if (atomic_dec_and_test(&kvm->users_count))
526 EXPORT_SYMBOL_GPL(kvm_put_kvm);
529 static int kvm_vm_release(struct inode *inode, struct file *filp)
531 struct kvm *kvm = filp->private_data;
533 kvm_irqfd_release(kvm);
540 * Allocate some memory and give it an address in the guest physical address
543 * Discontiguous memory is allowed, mostly for framebuffers.
545 * Must be called holding mmap_sem for write.
547 int __kvm_set_memory_region(struct kvm *kvm,
548 struct kvm_userspace_memory_region *mem,
551 int r, flush_shadow = 0;
553 unsigned long npages;
555 struct kvm_memory_slot *memslot;
556 struct kvm_memory_slot old, new;
557 struct kvm_memslots *slots, *old_memslots;
560 /* General sanity checks */
561 if (mem->memory_size & (PAGE_SIZE - 1))
563 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
565 if (user_alloc && (mem->userspace_addr & (PAGE_SIZE - 1)))
567 if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
569 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
572 memslot = &kvm->memslots->memslots[mem->slot];
573 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
574 npages = mem->memory_size >> PAGE_SHIFT;
577 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
579 new = old = *memslot;
581 new.base_gfn = base_gfn;
583 new.flags = mem->flags;
585 /* Disallow changing a memory slot's size. */
587 if (npages && old.npages && npages != old.npages)
590 /* Check for overlaps */
592 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
593 struct kvm_memory_slot *s = &kvm->memslots->memslots[i];
595 if (s == memslot || !s->npages)
597 if (!((base_gfn + npages <= s->base_gfn) ||
598 (base_gfn >= s->base_gfn + s->npages)))
602 /* Free page dirty bitmap if unneeded */
603 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
604 new.dirty_bitmap = NULL;
608 /* Allocate if a slot is being created */
610 if (npages && !new.rmap) {
611 new.rmap = vmalloc(npages * sizeof(struct page *));
616 memset(new.rmap, 0, npages * sizeof(*new.rmap));
618 new.user_alloc = user_alloc;
619 new.userspace_addr = mem->userspace_addr;
624 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
630 /* Avoid unused variable warning if no large pages */
633 if (new.lpage_info[i])
636 lpages = 1 + (base_gfn + npages - 1) /
637 KVM_PAGES_PER_HPAGE(level);
638 lpages -= base_gfn / KVM_PAGES_PER_HPAGE(level);
640 new.lpage_info[i] = vmalloc(lpages * sizeof(*new.lpage_info[i]));
642 if (!new.lpage_info[i])
645 memset(new.lpage_info[i], 0,
646 lpages * sizeof(*new.lpage_info[i]));
648 if (base_gfn % KVM_PAGES_PER_HPAGE(level))
649 new.lpage_info[i][0].write_count = 1;
650 if ((base_gfn+npages) % KVM_PAGES_PER_HPAGE(level))
651 new.lpage_info[i][lpages - 1].write_count = 1;
652 ugfn = new.userspace_addr >> PAGE_SHIFT;
654 * If the gfn and userspace address are not aligned wrt each
655 * other, or if explicitly asked to, disable large page
656 * support for this slot
658 if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
660 for (j = 0; j < lpages; ++j)
661 new.lpage_info[i][j].write_count = 1;
666 /* Allocate page dirty bitmap if needed */
667 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
668 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
670 new.dirty_bitmap = vmalloc(dirty_bytes);
671 if (!new.dirty_bitmap)
673 memset(new.dirty_bitmap, 0, dirty_bytes);
674 /* destroy any largepage mappings for dirty tracking */
678 #else /* not defined CONFIG_S390 */
679 new.user_alloc = user_alloc;
681 new.userspace_addr = mem->userspace_addr;
682 #endif /* not defined CONFIG_S390 */
686 slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
689 memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
690 if (mem->slot >= slots->nmemslots)
691 slots->nmemslots = mem->slot + 1;
692 slots->memslots[mem->slot].flags |= KVM_MEMSLOT_INVALID;
694 old_memslots = kvm->memslots;
695 rcu_assign_pointer(kvm->memslots, slots);
696 synchronize_srcu_expedited(&kvm->srcu);
697 /* From this point no new shadow pages pointing to a deleted
698 * memslot will be created.
700 * validation of sp->gfn happens in:
701 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
702 * - kvm_is_visible_gfn (mmu_check_roots)
704 kvm_arch_flush_shadow(kvm);
708 r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc);
713 /* map the pages in iommu page table */
715 r = kvm_iommu_map_pages(kvm, &new);
722 slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
725 memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
726 if (mem->slot >= slots->nmemslots)
727 slots->nmemslots = mem->slot + 1;
729 /* actual memory is freed via old in kvm_free_physmem_slot below */
732 new.dirty_bitmap = NULL;
733 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i)
734 new.lpage_info[i] = NULL;
737 slots->memslots[mem->slot] = new;
738 old_memslots = kvm->memslots;
739 rcu_assign_pointer(kvm->memslots, slots);
740 synchronize_srcu_expedited(&kvm->srcu);
742 kvm_arch_commit_memory_region(kvm, mem, old, user_alloc);
744 kvm_free_physmem_slot(&old, &new);
748 kvm_arch_flush_shadow(kvm);
753 kvm_free_physmem_slot(&new, &old);
758 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
760 int kvm_set_memory_region(struct kvm *kvm,
761 struct kvm_userspace_memory_region *mem,
766 down_write(&kvm->slots_lock);
767 r = __kvm_set_memory_region(kvm, mem, user_alloc);
768 up_write(&kvm->slots_lock);
771 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
773 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
775 kvm_userspace_memory_region *mem,
778 if (mem->slot >= KVM_MEMORY_SLOTS)
780 return kvm_set_memory_region(kvm, mem, user_alloc);
783 int kvm_get_dirty_log(struct kvm *kvm,
784 struct kvm_dirty_log *log, int *is_dirty)
786 struct kvm_memory_slot *memslot;
789 unsigned long any = 0;
792 if (log->slot >= KVM_MEMORY_SLOTS)
795 memslot = &kvm->memslots->memslots[log->slot];
797 if (!memslot->dirty_bitmap)
800 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
802 for (i = 0; !any && i < n/sizeof(long); ++i)
803 any = memslot->dirty_bitmap[i];
806 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
817 void kvm_disable_largepages(void)
819 largepages_enabled = false;
821 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
823 int is_error_page(struct page *page)
825 return page == bad_page;
827 EXPORT_SYMBOL_GPL(is_error_page);
829 int is_error_pfn(pfn_t pfn)
831 return pfn == bad_pfn;
833 EXPORT_SYMBOL_GPL(is_error_pfn);
835 static inline unsigned long bad_hva(void)
840 int kvm_is_error_hva(unsigned long addr)
842 return addr == bad_hva();
844 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
846 struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn)
849 struct kvm_memslots *slots = rcu_dereference(kvm->memslots);
851 for (i = 0; i < slots->nmemslots; ++i) {
852 struct kvm_memory_slot *memslot = &slots->memslots[i];
854 if (gfn >= memslot->base_gfn
855 && gfn < memslot->base_gfn + memslot->npages)
860 EXPORT_SYMBOL_GPL(gfn_to_memslot_unaliased);
862 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
864 gfn = unalias_gfn(kvm, gfn);
865 return gfn_to_memslot_unaliased(kvm, gfn);
868 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
871 struct kvm_memslots *slots = rcu_dereference(kvm->memslots);
873 gfn = unalias_gfn_instantiation(kvm, gfn);
874 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
875 struct kvm_memory_slot *memslot = &slots->memslots[i];
877 if (memslot->flags & KVM_MEMSLOT_INVALID)
880 if (gfn >= memslot->base_gfn
881 && gfn < memslot->base_gfn + memslot->npages)
886 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
888 int memslot_id(struct kvm *kvm, gfn_t gfn)
891 struct kvm_memslots *slots = rcu_dereference(kvm->memslots);
892 struct kvm_memory_slot *memslot = NULL;
894 gfn = unalias_gfn(kvm, gfn);
895 for (i = 0; i < slots->nmemslots; ++i) {
896 memslot = &slots->memslots[i];
898 if (gfn >= memslot->base_gfn
899 && gfn < memslot->base_gfn + memslot->npages)
903 return memslot - slots->memslots;
906 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
908 struct kvm_memory_slot *slot;
910 gfn = unalias_gfn_instantiation(kvm, gfn);
911 slot = gfn_to_memslot_unaliased(kvm, gfn);
912 if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
914 return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE);
916 EXPORT_SYMBOL_GPL(gfn_to_hva);
918 static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr)
920 struct page *page[1];
926 npages = get_user_pages_fast(addr, 1, 1, page);
928 if (unlikely(npages != 1)) {
929 struct vm_area_struct *vma;
931 down_read(¤t->mm->mmap_sem);
932 vma = find_vma(current->mm, addr);
934 if (vma == NULL || addr < vma->vm_start ||
935 !(vma->vm_flags & VM_PFNMAP)) {
936 up_read(¤t->mm->mmap_sem);
938 return page_to_pfn(bad_page);
941 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
942 up_read(¤t->mm->mmap_sem);
943 BUG_ON(!kvm_is_mmio_pfn(pfn));
945 pfn = page_to_pfn(page[0]);
950 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
954 addr = gfn_to_hva(kvm, gfn);
955 if (kvm_is_error_hva(addr)) {
957 return page_to_pfn(bad_page);
960 return hva_to_pfn(kvm, addr);
962 EXPORT_SYMBOL_GPL(gfn_to_pfn);
964 static unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
966 return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE);
969 pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
970 struct kvm_memory_slot *slot, gfn_t gfn)
972 unsigned long addr = gfn_to_hva_memslot(slot, gfn);
973 return hva_to_pfn(kvm, addr);
976 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
980 pfn = gfn_to_pfn(kvm, gfn);
981 if (!kvm_is_mmio_pfn(pfn))
982 return pfn_to_page(pfn);
984 WARN_ON(kvm_is_mmio_pfn(pfn));
990 EXPORT_SYMBOL_GPL(gfn_to_page);
992 void kvm_release_page_clean(struct page *page)
994 kvm_release_pfn_clean(page_to_pfn(page));
996 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
998 void kvm_release_pfn_clean(pfn_t pfn)
1000 if (!kvm_is_mmio_pfn(pfn))
1001 put_page(pfn_to_page(pfn));
1003 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1005 void kvm_release_page_dirty(struct page *page)
1007 kvm_release_pfn_dirty(page_to_pfn(page));
1009 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1011 void kvm_release_pfn_dirty(pfn_t pfn)
1013 kvm_set_pfn_dirty(pfn);
1014 kvm_release_pfn_clean(pfn);
1016 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1018 void kvm_set_page_dirty(struct page *page)
1020 kvm_set_pfn_dirty(page_to_pfn(page));
1022 EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
1024 void kvm_set_pfn_dirty(pfn_t pfn)
1026 if (!kvm_is_mmio_pfn(pfn)) {
1027 struct page *page = pfn_to_page(pfn);
1028 if (!PageReserved(page))
1032 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1034 void kvm_set_pfn_accessed(pfn_t pfn)
1036 if (!kvm_is_mmio_pfn(pfn))
1037 mark_page_accessed(pfn_to_page(pfn));
1039 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1041 void kvm_get_pfn(pfn_t pfn)
1043 if (!kvm_is_mmio_pfn(pfn))
1044 get_page(pfn_to_page(pfn));
1046 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1048 static int next_segment(unsigned long len, int offset)
1050 if (len > PAGE_SIZE - offset)
1051 return PAGE_SIZE - offset;
1056 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1062 addr = gfn_to_hva(kvm, gfn);
1063 if (kvm_is_error_hva(addr))
1065 r = copy_from_user(data, (void __user *)addr + offset, len);
1070 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1072 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1074 gfn_t gfn = gpa >> PAGE_SHIFT;
1076 int offset = offset_in_page(gpa);
1079 while ((seg = next_segment(len, offset)) != 0) {
1080 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1090 EXPORT_SYMBOL_GPL(kvm_read_guest);
1092 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1097 gfn_t gfn = gpa >> PAGE_SHIFT;
1098 int offset = offset_in_page(gpa);
1100 addr = gfn_to_hva(kvm, gfn);
1101 if (kvm_is_error_hva(addr))
1103 pagefault_disable();
1104 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1110 EXPORT_SYMBOL(kvm_read_guest_atomic);
1112 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1113 int offset, int len)
1118 addr = gfn_to_hva(kvm, gfn);
1119 if (kvm_is_error_hva(addr))
1121 r = copy_to_user((void __user *)addr + offset, data, len);
1124 mark_page_dirty(kvm, gfn);
1127 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1129 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1132 gfn_t gfn = gpa >> PAGE_SHIFT;
1134 int offset = offset_in_page(gpa);
1137 while ((seg = next_segment(len, offset)) != 0) {
1138 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1149 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1151 return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len);
1153 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1155 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1157 gfn_t gfn = gpa >> PAGE_SHIFT;
1159 int offset = offset_in_page(gpa);
1162 while ((seg = next_segment(len, offset)) != 0) {
1163 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1172 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1174 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1176 struct kvm_memory_slot *memslot;
1178 gfn = unalias_gfn(kvm, gfn);
1179 memslot = gfn_to_memslot_unaliased(kvm, gfn);
1180 if (memslot && memslot->dirty_bitmap) {
1181 unsigned long rel_gfn = gfn - memslot->base_gfn;
1184 if (!generic_test_le_bit(rel_gfn, memslot->dirty_bitmap))
1185 generic___set_le_bit(rel_gfn, memslot->dirty_bitmap);
1190 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1192 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1197 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1199 if (kvm_arch_vcpu_runnable(vcpu)) {
1200 set_bit(KVM_REQ_UNHALT, &vcpu->requests);
1203 if (kvm_cpu_has_pending_timer(vcpu))
1205 if (signal_pending(current))
1211 finish_wait(&vcpu->wq, &wait);
1214 void kvm_resched(struct kvm_vcpu *vcpu)
1216 if (!need_resched())
1220 EXPORT_SYMBOL_GPL(kvm_resched);
1222 void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu)
1227 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1229 /* Sleep for 100 us, and hope lock-holder got scheduled */
1230 expires = ktime_add_ns(ktime_get(), 100000UL);
1231 schedule_hrtimeout(&expires, HRTIMER_MODE_ABS);
1233 finish_wait(&vcpu->wq, &wait);
1235 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
1237 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1239 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1242 if (vmf->pgoff == 0)
1243 page = virt_to_page(vcpu->run);
1245 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
1246 page = virt_to_page(vcpu->arch.pio_data);
1248 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1249 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1250 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1253 return VM_FAULT_SIGBUS;
1259 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
1260 .fault = kvm_vcpu_fault,
1263 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1265 vma->vm_ops = &kvm_vcpu_vm_ops;
1269 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1271 struct kvm_vcpu *vcpu = filp->private_data;
1273 kvm_put_kvm(vcpu->kvm);
1277 static struct file_operations kvm_vcpu_fops = {
1278 .release = kvm_vcpu_release,
1279 .unlocked_ioctl = kvm_vcpu_ioctl,
1280 .compat_ioctl = kvm_vcpu_ioctl,
1281 .mmap = kvm_vcpu_mmap,
1285 * Allocates an inode for the vcpu.
1287 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1289 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR);
1293 * Creates some virtual cpus. Good luck creating more than one.
1295 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
1298 struct kvm_vcpu *vcpu, *v;
1300 vcpu = kvm_arch_vcpu_create(kvm, id);
1302 return PTR_ERR(vcpu);
1304 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1306 r = kvm_arch_vcpu_setup(vcpu);
1310 mutex_lock(&kvm->lock);
1311 if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
1316 kvm_for_each_vcpu(r, v, kvm)
1317 if (v->vcpu_id == id) {
1322 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
1324 /* Now it's all set up, let userspace reach it */
1326 r = create_vcpu_fd(vcpu);
1332 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
1334 atomic_inc(&kvm->online_vcpus);
1336 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1337 if (kvm->bsp_vcpu_id == id)
1338 kvm->bsp_vcpu = vcpu;
1340 mutex_unlock(&kvm->lock);
1344 mutex_unlock(&kvm->lock);
1345 kvm_arch_vcpu_destroy(vcpu);
1349 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1352 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1353 vcpu->sigset_active = 1;
1354 vcpu->sigset = *sigset;
1356 vcpu->sigset_active = 0;
1360 static long kvm_vcpu_ioctl(struct file *filp,
1361 unsigned int ioctl, unsigned long arg)
1363 struct kvm_vcpu *vcpu = filp->private_data;
1364 void __user *argp = (void __user *)arg;
1366 struct kvm_fpu *fpu = NULL;
1367 struct kvm_sregs *kvm_sregs = NULL;
1369 if (vcpu->kvm->mm != current->mm)
1376 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
1378 case KVM_GET_REGS: {
1379 struct kvm_regs *kvm_regs;
1382 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1385 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
1389 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1396 case KVM_SET_REGS: {
1397 struct kvm_regs *kvm_regs;
1400 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1404 if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs)))
1406 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
1414 case KVM_GET_SREGS: {
1415 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1419 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
1423 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
1428 case KVM_SET_SREGS: {
1429 kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1434 if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs)))
1436 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
1442 case KVM_GET_MP_STATE: {
1443 struct kvm_mp_state mp_state;
1445 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
1449 if (copy_to_user(argp, &mp_state, sizeof mp_state))
1454 case KVM_SET_MP_STATE: {
1455 struct kvm_mp_state mp_state;
1458 if (copy_from_user(&mp_state, argp, sizeof mp_state))
1460 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
1466 case KVM_TRANSLATE: {
1467 struct kvm_translation tr;
1470 if (copy_from_user(&tr, argp, sizeof tr))
1472 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
1476 if (copy_to_user(argp, &tr, sizeof tr))
1481 case KVM_SET_GUEST_DEBUG: {
1482 struct kvm_guest_debug dbg;
1485 if (copy_from_user(&dbg, argp, sizeof dbg))
1487 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
1493 case KVM_SET_SIGNAL_MASK: {
1494 struct kvm_signal_mask __user *sigmask_arg = argp;
1495 struct kvm_signal_mask kvm_sigmask;
1496 sigset_t sigset, *p;
1501 if (copy_from_user(&kvm_sigmask, argp,
1502 sizeof kvm_sigmask))
1505 if (kvm_sigmask.len != sizeof sigset)
1508 if (copy_from_user(&sigset, sigmask_arg->sigset,
1513 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
1517 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1521 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
1525 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
1531 fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1536 if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu)))
1538 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
1545 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1553 static long kvm_vm_ioctl(struct file *filp,
1554 unsigned int ioctl, unsigned long arg)
1556 struct kvm *kvm = filp->private_data;
1557 void __user *argp = (void __user *)arg;
1560 if (kvm->mm != current->mm)
1563 case KVM_CREATE_VCPU:
1564 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
1568 case KVM_SET_USER_MEMORY_REGION: {
1569 struct kvm_userspace_memory_region kvm_userspace_mem;
1572 if (copy_from_user(&kvm_userspace_mem, argp,
1573 sizeof kvm_userspace_mem))
1576 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
1581 case KVM_GET_DIRTY_LOG: {
1582 struct kvm_dirty_log log;
1585 if (copy_from_user(&log, argp, sizeof log))
1587 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
1592 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1593 case KVM_REGISTER_COALESCED_MMIO: {
1594 struct kvm_coalesced_mmio_zone zone;
1596 if (copy_from_user(&zone, argp, sizeof zone))
1599 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
1605 case KVM_UNREGISTER_COALESCED_MMIO: {
1606 struct kvm_coalesced_mmio_zone zone;
1608 if (copy_from_user(&zone, argp, sizeof zone))
1611 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
1619 struct kvm_irqfd data;
1622 if (copy_from_user(&data, argp, sizeof data))
1624 r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags);
1627 case KVM_IOEVENTFD: {
1628 struct kvm_ioeventfd data;
1631 if (copy_from_user(&data, argp, sizeof data))
1633 r = kvm_ioeventfd(kvm, &data);
1636 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1637 case KVM_SET_BOOT_CPU_ID:
1639 mutex_lock(&kvm->lock);
1640 if (atomic_read(&kvm->online_vcpus) != 0)
1643 kvm->bsp_vcpu_id = arg;
1644 mutex_unlock(&kvm->lock);
1648 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
1650 r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
1656 #ifdef CONFIG_COMPAT
1657 struct compat_kvm_dirty_log {
1661 compat_uptr_t dirty_bitmap; /* one bit per page */
1666 static long kvm_vm_compat_ioctl(struct file *filp,
1667 unsigned int ioctl, unsigned long arg)
1669 struct kvm *kvm = filp->private_data;
1672 if (kvm->mm != current->mm)
1675 case KVM_GET_DIRTY_LOG: {
1676 struct compat_kvm_dirty_log compat_log;
1677 struct kvm_dirty_log log;
1680 if (copy_from_user(&compat_log, (void __user *)arg,
1681 sizeof(compat_log)))
1683 log.slot = compat_log.slot;
1684 log.padding1 = compat_log.padding1;
1685 log.padding2 = compat_log.padding2;
1686 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
1688 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
1694 r = kvm_vm_ioctl(filp, ioctl, arg);
1702 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1704 struct page *page[1];
1707 gfn_t gfn = vmf->pgoff;
1708 struct kvm *kvm = vma->vm_file->private_data;
1710 addr = gfn_to_hva(kvm, gfn);
1711 if (kvm_is_error_hva(addr))
1712 return VM_FAULT_SIGBUS;
1714 npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
1716 if (unlikely(npages != 1))
1717 return VM_FAULT_SIGBUS;
1719 vmf->page = page[0];
1723 static const struct vm_operations_struct kvm_vm_vm_ops = {
1724 .fault = kvm_vm_fault,
1727 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
1729 vma->vm_ops = &kvm_vm_vm_ops;
1733 static struct file_operations kvm_vm_fops = {
1734 .release = kvm_vm_release,
1735 .unlocked_ioctl = kvm_vm_ioctl,
1736 #ifdef CONFIG_COMPAT
1737 .compat_ioctl = kvm_vm_compat_ioctl,
1739 .mmap = kvm_vm_mmap,
1742 static int kvm_dev_ioctl_create_vm(void)
1747 kvm = kvm_create_vm();
1749 return PTR_ERR(kvm);
1750 fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
1757 static long kvm_dev_ioctl_check_extension_generic(long arg)
1760 case KVM_CAP_USER_MEMORY:
1761 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
1762 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
1763 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1764 case KVM_CAP_SET_BOOT_CPU_ID:
1766 case KVM_CAP_INTERNAL_ERROR_DATA:
1768 #ifdef CONFIG_HAVE_KVM_IRQCHIP
1769 case KVM_CAP_IRQ_ROUTING:
1770 return KVM_MAX_IRQ_ROUTES;
1775 return kvm_dev_ioctl_check_extension(arg);
1778 static long kvm_dev_ioctl(struct file *filp,
1779 unsigned int ioctl, unsigned long arg)
1784 case KVM_GET_API_VERSION:
1788 r = KVM_API_VERSION;
1794 r = kvm_dev_ioctl_create_vm();
1796 case KVM_CHECK_EXTENSION:
1797 r = kvm_dev_ioctl_check_extension_generic(arg);
1799 case KVM_GET_VCPU_MMAP_SIZE:
1803 r = PAGE_SIZE; /* struct kvm_run */
1805 r += PAGE_SIZE; /* pio data page */
1807 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1808 r += PAGE_SIZE; /* coalesced mmio ring page */
1811 case KVM_TRACE_ENABLE:
1812 case KVM_TRACE_PAUSE:
1813 case KVM_TRACE_DISABLE:
1817 return kvm_arch_dev_ioctl(filp, ioctl, arg);
1823 static struct file_operations kvm_chardev_ops = {
1824 .unlocked_ioctl = kvm_dev_ioctl,
1825 .compat_ioctl = kvm_dev_ioctl,
1828 static struct miscdevice kvm_dev = {
1834 static void hardware_enable(void *junk)
1836 int cpu = raw_smp_processor_id();
1839 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
1842 cpumask_set_cpu(cpu, cpus_hardware_enabled);
1844 r = kvm_arch_hardware_enable(NULL);
1847 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
1848 atomic_inc(&hardware_enable_failed);
1849 printk(KERN_INFO "kvm: enabling virtualization on "
1850 "CPU%d failed\n", cpu);
1854 static void hardware_disable(void *junk)
1856 int cpu = raw_smp_processor_id();
1858 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
1860 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
1861 kvm_arch_hardware_disable(NULL);
1864 static void hardware_disable_all_nolock(void)
1866 BUG_ON(!kvm_usage_count);
1869 if (!kvm_usage_count)
1870 on_each_cpu(hardware_disable, NULL, 1);
1873 static void hardware_disable_all(void)
1875 spin_lock(&kvm_lock);
1876 hardware_disable_all_nolock();
1877 spin_unlock(&kvm_lock);
1880 static int hardware_enable_all(void)
1884 spin_lock(&kvm_lock);
1887 if (kvm_usage_count == 1) {
1888 atomic_set(&hardware_enable_failed, 0);
1889 on_each_cpu(hardware_enable, NULL, 1);
1891 if (atomic_read(&hardware_enable_failed)) {
1892 hardware_disable_all_nolock();
1897 spin_unlock(&kvm_lock);
1902 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
1907 if (!kvm_usage_count)
1910 val &= ~CPU_TASKS_FROZEN;
1913 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
1915 hardware_disable(NULL);
1917 case CPU_UP_CANCELED:
1918 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
1920 smp_call_function_single(cpu, hardware_disable, NULL, 1);
1923 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
1925 smp_call_function_single(cpu, hardware_enable, NULL, 1);
1932 asmlinkage void kvm_handle_fault_on_reboot(void)
1935 /* spin while reset goes on */
1938 /* Fault while not rebooting. We want the trace. */
1941 EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot);
1943 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
1947 * Some (well, at least mine) BIOSes hang on reboot if
1950 * And Intel TXT required VMX off for all cpu when system shutdown.
1952 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
1953 kvm_rebooting = true;
1954 on_each_cpu(hardware_disable, NULL, 1);
1958 static struct notifier_block kvm_reboot_notifier = {
1959 .notifier_call = kvm_reboot,
1963 static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
1967 for (i = 0; i < bus->dev_count; i++) {
1968 struct kvm_io_device *pos = bus->devs[i];
1970 kvm_iodevice_destructor(pos);
1975 /* kvm_io_bus_write - called under kvm->slots_lock */
1976 int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
1977 int len, const void *val)
1980 struct kvm_io_bus *bus = rcu_dereference(kvm->buses[bus_idx]);
1981 for (i = 0; i < bus->dev_count; i++)
1982 if (!kvm_iodevice_write(bus->devs[i], addr, len, val))
1987 /* kvm_io_bus_read - called under kvm->slots_lock */
1988 int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
1992 struct kvm_io_bus *bus = rcu_dereference(kvm->buses[bus_idx]);
1994 for (i = 0; i < bus->dev_count; i++)
1995 if (!kvm_iodevice_read(bus->devs[i], addr, len, val))
2000 /* Caller must have write lock on slots_lock. */
2001 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2002 struct kvm_io_device *dev)
2004 struct kvm_io_bus *new_bus, *bus;
2006 bus = kvm->buses[bus_idx];
2007 if (bus->dev_count > NR_IOBUS_DEVS-1)
2010 new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL);
2013 memcpy(new_bus, bus, sizeof(struct kvm_io_bus));
2014 new_bus->devs[new_bus->dev_count++] = dev;
2015 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2016 synchronize_srcu_expedited(&kvm->srcu);
2022 /* Caller must have write lock on slots_lock. */
2023 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2024 struct kvm_io_device *dev)
2027 struct kvm_io_bus *new_bus, *bus;
2029 new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL);
2033 bus = kvm->buses[bus_idx];
2034 memcpy(new_bus, bus, sizeof(struct kvm_io_bus));
2037 for (i = 0; i < new_bus->dev_count; i++)
2038 if (new_bus->devs[i] == dev) {
2040 new_bus->devs[i] = new_bus->devs[--new_bus->dev_count];
2049 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2050 synchronize_srcu_expedited(&kvm->srcu);
2055 static struct notifier_block kvm_cpu_notifier = {
2056 .notifier_call = kvm_cpu_hotplug,
2057 .priority = 20, /* must be > scheduler priority */
2060 static int vm_stat_get(void *_offset, u64 *val)
2062 unsigned offset = (long)_offset;
2066 spin_lock(&kvm_lock);
2067 list_for_each_entry(kvm, &vm_list, vm_list)
2068 *val += *(u32 *)((void *)kvm + offset);
2069 spin_unlock(&kvm_lock);
2073 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
2075 static int vcpu_stat_get(void *_offset, u64 *val)
2077 unsigned offset = (long)_offset;
2079 struct kvm_vcpu *vcpu;
2083 spin_lock(&kvm_lock);
2084 list_for_each_entry(kvm, &vm_list, vm_list)
2085 kvm_for_each_vcpu(i, vcpu, kvm)
2086 *val += *(u32 *)((void *)vcpu + offset);
2088 spin_unlock(&kvm_lock);
2092 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
2094 static const struct file_operations *stat_fops[] = {
2095 [KVM_STAT_VCPU] = &vcpu_stat_fops,
2096 [KVM_STAT_VM] = &vm_stat_fops,
2099 static void kvm_init_debug(void)
2101 struct kvm_stats_debugfs_item *p;
2103 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
2104 for (p = debugfs_entries; p->name; ++p)
2105 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
2106 (void *)(long)p->offset,
2107 stat_fops[p->kind]);
2110 static void kvm_exit_debug(void)
2112 struct kvm_stats_debugfs_item *p;
2114 for (p = debugfs_entries; p->name; ++p)
2115 debugfs_remove(p->dentry);
2116 debugfs_remove(kvm_debugfs_dir);
2119 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
2121 if (kvm_usage_count)
2122 hardware_disable(NULL);
2126 static int kvm_resume(struct sys_device *dev)
2128 if (kvm_usage_count)
2129 hardware_enable(NULL);
2133 static struct sysdev_class kvm_sysdev_class = {
2135 .suspend = kvm_suspend,
2136 .resume = kvm_resume,
2139 static struct sys_device kvm_sysdev = {
2141 .cls = &kvm_sysdev_class,
2144 struct page *bad_page;
2148 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
2150 return container_of(pn, struct kvm_vcpu, preempt_notifier);
2153 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
2155 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2157 kvm_arch_vcpu_load(vcpu, cpu);
2160 static void kvm_sched_out(struct preempt_notifier *pn,
2161 struct task_struct *next)
2163 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2165 kvm_arch_vcpu_put(vcpu);
2168 int kvm_init(void *opaque, unsigned int vcpu_size,
2169 struct module *module)
2174 r = kvm_arch_init(opaque);
2178 bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2180 if (bad_page == NULL) {
2185 bad_pfn = page_to_pfn(bad_page);
2187 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
2192 r = kvm_arch_hardware_setup();
2196 for_each_online_cpu(cpu) {
2197 smp_call_function_single(cpu,
2198 kvm_arch_check_processor_compat,
2204 r = register_cpu_notifier(&kvm_cpu_notifier);
2207 register_reboot_notifier(&kvm_reboot_notifier);
2209 r = sysdev_class_register(&kvm_sysdev_class);
2213 r = sysdev_register(&kvm_sysdev);
2217 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2218 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
2219 __alignof__(struct kvm_vcpu),
2221 if (!kvm_vcpu_cache) {
2226 kvm_chardev_ops.owner = module;
2227 kvm_vm_fops.owner = module;
2228 kvm_vcpu_fops.owner = module;
2230 r = misc_register(&kvm_dev);
2232 printk(KERN_ERR "kvm: misc device register failed\n");
2236 kvm_preempt_ops.sched_in = kvm_sched_in;
2237 kvm_preempt_ops.sched_out = kvm_sched_out;
2244 kmem_cache_destroy(kvm_vcpu_cache);
2246 sysdev_unregister(&kvm_sysdev);
2248 sysdev_class_unregister(&kvm_sysdev_class);
2250 unregister_reboot_notifier(&kvm_reboot_notifier);
2251 unregister_cpu_notifier(&kvm_cpu_notifier);
2254 kvm_arch_hardware_unsetup();
2256 free_cpumask_var(cpus_hardware_enabled);
2258 __free_page(bad_page);
2264 EXPORT_SYMBOL_GPL(kvm_init);
2268 tracepoint_synchronize_unregister();
2270 misc_deregister(&kvm_dev);
2271 kmem_cache_destroy(kvm_vcpu_cache);
2272 sysdev_unregister(&kvm_sysdev);
2273 sysdev_class_unregister(&kvm_sysdev_class);
2274 unregister_reboot_notifier(&kvm_reboot_notifier);
2275 unregister_cpu_notifier(&kvm_cpu_notifier);
2276 on_each_cpu(hardware_disable, NULL, 1);
2277 kvm_arch_hardware_unsetup();
2279 free_cpumask_var(cpus_hardware_enabled);
2280 __free_page(bad_page);
2282 EXPORT_SYMBOL_GPL(kvm_exit);