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/syscore_ops.h>
34 #include <linux/cpu.h>
35 #include <linux/sched.h>
36 #include <linux/cpumask.h>
37 #include <linux/smp.h>
38 #include <linux/anon_inodes.h>
39 #include <linux/profile.h>
40 #include <linux/kvm_para.h>
41 #include <linux/pagemap.h>
42 #include <linux/mman.h>
43 #include <linux/swap.h>
44 #include <linux/bitops.h>
45 #include <linux/spinlock.h>
46 #include <linux/compat.h>
47 #include <linux/srcu.h>
48 #include <linux/hugetlb.h>
49 #include <linux/slab.h>
51 #include <asm/processor.h>
53 #include <asm/uaccess.h>
54 #include <asm/pgtable.h>
56 #include "coalesced_mmio.h"
59 #define CREATE_TRACE_POINTS
60 #include <trace/events/kvm.h>
62 MODULE_AUTHOR("Qumranet");
63 MODULE_LICENSE("GPL");
68 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
71 DEFINE_RAW_SPINLOCK(kvm_lock);
74 static cpumask_var_t cpus_hardware_enabled;
75 static int kvm_usage_count = 0;
76 static atomic_t hardware_enable_failed;
78 struct kmem_cache *kvm_vcpu_cache;
79 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
81 static __read_mostly struct preempt_ops kvm_preempt_ops;
83 struct dentry *kvm_debugfs_dir;
85 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
87 static int hardware_enable_all(void);
88 static void hardware_disable_all(void);
90 static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
93 EXPORT_SYMBOL_GPL(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)) {
107 struct page *tail = pfn_to_page(pfn);
108 struct page *head = compound_trans_head(tail);
109 reserved = PageReserved(head);
112 * "head" is not a dangling pointer
113 * (compound_trans_head takes care of that)
114 * but the hugepage may have been splitted
115 * from under us (and we may not hold a
116 * reference count on the head page so it can
117 * be reused before we run PageReferenced), so
118 * we've to check PageTail before returning
125 return PageReserved(tail);
132 * Switches to specified vcpu, until a matching vcpu_put()
134 void vcpu_load(struct kvm_vcpu *vcpu)
138 mutex_lock(&vcpu->mutex);
139 if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) {
140 /* The thread running this VCPU changed. */
141 struct pid *oldpid = vcpu->pid;
142 struct pid *newpid = get_task_pid(current, PIDTYPE_PID);
143 rcu_assign_pointer(vcpu->pid, newpid);
148 preempt_notifier_register(&vcpu->preempt_notifier);
149 kvm_arch_vcpu_load(vcpu, cpu);
153 void vcpu_put(struct kvm_vcpu *vcpu)
156 kvm_arch_vcpu_put(vcpu);
157 preempt_notifier_unregister(&vcpu->preempt_notifier);
159 mutex_unlock(&vcpu->mutex);
162 static void ack_flush(void *_completed)
166 static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
171 struct kvm_vcpu *vcpu;
173 zalloc_cpumask_var(&cpus, GFP_ATOMIC);
176 kvm_for_each_vcpu(i, vcpu, kvm) {
177 kvm_make_request(req, vcpu);
180 /* Set ->requests bit before we read ->mode */
183 if (cpus != NULL && cpu != -1 && cpu != me &&
184 kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE)
185 cpumask_set_cpu(cpu, cpus);
187 if (unlikely(cpus == NULL))
188 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
189 else if (!cpumask_empty(cpus))
190 smp_call_function_many(cpus, ack_flush, NULL, 1);
194 free_cpumask_var(cpus);
198 void kvm_flush_remote_tlbs(struct kvm *kvm)
200 int dirty_count = kvm->tlbs_dirty;
203 if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
204 ++kvm->stat.remote_tlb_flush;
205 cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
208 void kvm_reload_remote_mmus(struct kvm *kvm)
210 make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
213 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
218 mutex_init(&vcpu->mutex);
223 init_waitqueue_head(&vcpu->wq);
224 kvm_async_pf_vcpu_init(vcpu);
226 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
231 vcpu->run = page_address(page);
233 r = kvm_arch_vcpu_init(vcpu);
239 free_page((unsigned long)vcpu->run);
243 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
245 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
248 kvm_arch_vcpu_uninit(vcpu);
249 free_page((unsigned long)vcpu->run);
251 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
253 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
254 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
256 return container_of(mn, struct kvm, mmu_notifier);
259 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
260 struct mm_struct *mm,
261 unsigned long address)
263 struct kvm *kvm = mmu_notifier_to_kvm(mn);
264 int need_tlb_flush, idx;
267 * When ->invalidate_page runs, the linux pte has been zapped
268 * already but the page is still allocated until
269 * ->invalidate_page returns. So if we increase the sequence
270 * here the kvm page fault will notice if the spte can't be
271 * established because the page is going to be freed. If
272 * instead the kvm page fault establishes the spte before
273 * ->invalidate_page runs, kvm_unmap_hva will release it
276 * The sequence increase only need to be seen at spin_unlock
277 * time, and not at spin_lock time.
279 * Increasing the sequence after the spin_unlock would be
280 * unsafe because the kvm page fault could then establish the
281 * pte after kvm_unmap_hva returned, without noticing the page
282 * is going to be freed.
284 idx = srcu_read_lock(&kvm->srcu);
285 spin_lock(&kvm->mmu_lock);
286 kvm->mmu_notifier_seq++;
287 need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty;
288 spin_unlock(&kvm->mmu_lock);
289 srcu_read_unlock(&kvm->srcu, idx);
291 /* we've to flush the tlb before the pages can be freed */
293 kvm_flush_remote_tlbs(kvm);
297 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
298 struct mm_struct *mm,
299 unsigned long address,
302 struct kvm *kvm = mmu_notifier_to_kvm(mn);
305 idx = srcu_read_lock(&kvm->srcu);
306 spin_lock(&kvm->mmu_lock);
307 kvm->mmu_notifier_seq++;
308 kvm_set_spte_hva(kvm, address, pte);
309 spin_unlock(&kvm->mmu_lock);
310 srcu_read_unlock(&kvm->srcu, idx);
313 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
314 struct mm_struct *mm,
318 struct kvm *kvm = mmu_notifier_to_kvm(mn);
319 int need_tlb_flush = 0, idx;
321 idx = srcu_read_lock(&kvm->srcu);
322 spin_lock(&kvm->mmu_lock);
324 * The count increase must become visible at unlock time as no
325 * spte can be established without taking the mmu_lock and
326 * count is also read inside the mmu_lock critical section.
328 kvm->mmu_notifier_count++;
329 for (; start < end; start += PAGE_SIZE)
330 need_tlb_flush |= kvm_unmap_hva(kvm, start);
331 need_tlb_flush |= kvm->tlbs_dirty;
332 spin_unlock(&kvm->mmu_lock);
333 srcu_read_unlock(&kvm->srcu, idx);
335 /* we've to flush the tlb before the pages can be freed */
337 kvm_flush_remote_tlbs(kvm);
340 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
341 struct mm_struct *mm,
345 struct kvm *kvm = mmu_notifier_to_kvm(mn);
347 spin_lock(&kvm->mmu_lock);
349 * This sequence increase will notify the kvm page fault that
350 * the page that is going to be mapped in the spte could have
353 kvm->mmu_notifier_seq++;
355 * The above sequence increase must be visible before the
356 * below count decrease but both values are read by the kvm
357 * page fault under mmu_lock spinlock so we don't need to add
358 * a smb_wmb() here in between the two.
360 kvm->mmu_notifier_count--;
361 spin_unlock(&kvm->mmu_lock);
363 BUG_ON(kvm->mmu_notifier_count < 0);
366 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
367 struct mm_struct *mm,
368 unsigned long address)
370 struct kvm *kvm = mmu_notifier_to_kvm(mn);
373 idx = srcu_read_lock(&kvm->srcu);
374 spin_lock(&kvm->mmu_lock);
375 young = kvm_age_hva(kvm, address);
376 spin_unlock(&kvm->mmu_lock);
377 srcu_read_unlock(&kvm->srcu, idx);
380 kvm_flush_remote_tlbs(kvm);
385 static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn,
386 struct mm_struct *mm,
387 unsigned long address)
389 struct kvm *kvm = mmu_notifier_to_kvm(mn);
392 idx = srcu_read_lock(&kvm->srcu);
393 spin_lock(&kvm->mmu_lock);
394 young = kvm_test_age_hva(kvm, address);
395 spin_unlock(&kvm->mmu_lock);
396 srcu_read_unlock(&kvm->srcu, idx);
401 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
402 struct mm_struct *mm)
404 struct kvm *kvm = mmu_notifier_to_kvm(mn);
407 idx = srcu_read_lock(&kvm->srcu);
408 kvm_arch_flush_shadow(kvm);
409 srcu_read_unlock(&kvm->srcu, idx);
412 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
413 .invalidate_page = kvm_mmu_notifier_invalidate_page,
414 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
415 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
416 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
417 .test_young = kvm_mmu_notifier_test_young,
418 .change_pte = kvm_mmu_notifier_change_pte,
419 .release = kvm_mmu_notifier_release,
422 static int kvm_init_mmu_notifier(struct kvm *kvm)
424 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
425 return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
428 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
430 static int kvm_init_mmu_notifier(struct kvm *kvm)
435 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
437 static struct kvm *kvm_create_vm(void)
440 struct kvm *kvm = kvm_arch_alloc_vm();
443 return ERR_PTR(-ENOMEM);
445 r = kvm_arch_init_vm(kvm);
447 goto out_err_nodisable;
449 r = hardware_enable_all();
451 goto out_err_nodisable;
453 #ifdef CONFIG_HAVE_KVM_IRQCHIP
454 INIT_HLIST_HEAD(&kvm->mask_notifier_list);
455 INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
459 kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
462 if (init_srcu_struct(&kvm->srcu))
464 for (i = 0; i < KVM_NR_BUSES; i++) {
465 kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus),
470 spin_lock_init(&kvm->mmu_lock);
472 r = kvm_init_mmu_notifier(kvm);
476 kvm->mm = current->mm;
477 atomic_inc(&kvm->mm->mm_count);
478 kvm_eventfd_init(kvm);
479 mutex_init(&kvm->lock);
480 mutex_init(&kvm->irq_lock);
481 mutex_init(&kvm->slots_lock);
482 atomic_set(&kvm->users_count, 1);
483 raw_spin_lock(&kvm_lock);
484 list_add(&kvm->vm_list, &vm_list);
485 raw_spin_unlock(&kvm_lock);
490 cleanup_srcu_struct(&kvm->srcu);
492 hardware_disable_all();
494 for (i = 0; i < KVM_NR_BUSES; i++)
495 kfree(kvm->buses[i]);
496 kfree(kvm->memslots);
497 kvm_arch_free_vm(kvm);
501 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
503 if (!memslot->dirty_bitmap)
506 if (2 * kvm_dirty_bitmap_bytes(memslot) > PAGE_SIZE)
507 vfree(memslot->dirty_bitmap_head);
509 kfree(memslot->dirty_bitmap_head);
511 memslot->dirty_bitmap = NULL;
512 memslot->dirty_bitmap_head = NULL;
516 * Free any memory in @free but not in @dont.
518 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
519 struct kvm_memory_slot *dont)
523 if (!dont || free->rmap != dont->rmap)
526 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
527 kvm_destroy_dirty_bitmap(free);
530 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
531 if (!dont || free->lpage_info[i] != dont->lpage_info[i]) {
532 vfree(free->lpage_info[i]);
533 free->lpage_info[i] = NULL;
541 void kvm_free_physmem(struct kvm *kvm)
544 struct kvm_memslots *slots = kvm->memslots;
546 for (i = 0; i < slots->nmemslots; ++i)
547 kvm_free_physmem_slot(&slots->memslots[i], NULL);
549 kfree(kvm->memslots);
552 static void kvm_destroy_vm(struct kvm *kvm)
555 struct mm_struct *mm = kvm->mm;
557 kvm_arch_sync_events(kvm);
558 raw_spin_lock(&kvm_lock);
559 list_del(&kvm->vm_list);
560 raw_spin_unlock(&kvm_lock);
561 kvm_free_irq_routing(kvm);
562 for (i = 0; i < KVM_NR_BUSES; i++)
563 kvm_io_bus_destroy(kvm->buses[i]);
564 kvm_coalesced_mmio_free(kvm);
565 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
566 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
568 kvm_arch_flush_shadow(kvm);
570 kvm_arch_destroy_vm(kvm);
571 kvm_free_physmem(kvm);
572 cleanup_srcu_struct(&kvm->srcu);
573 kvm_arch_free_vm(kvm);
574 hardware_disable_all();
578 void kvm_get_kvm(struct kvm *kvm)
580 atomic_inc(&kvm->users_count);
582 EXPORT_SYMBOL_GPL(kvm_get_kvm);
584 void kvm_put_kvm(struct kvm *kvm)
586 if (atomic_dec_and_test(&kvm->users_count))
589 EXPORT_SYMBOL_GPL(kvm_put_kvm);
592 static int kvm_vm_release(struct inode *inode, struct file *filp)
594 struct kvm *kvm = filp->private_data;
596 kvm_irqfd_release(kvm);
604 * Allocation size is twice as large as the actual dirty bitmap size.
605 * This makes it possible to do double buffering: see x86's
606 * kvm_vm_ioctl_get_dirty_log().
608 static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
610 unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
612 if (dirty_bytes > PAGE_SIZE)
613 memslot->dirty_bitmap = vzalloc(dirty_bytes);
615 memslot->dirty_bitmap = kzalloc(dirty_bytes, GFP_KERNEL);
617 if (!memslot->dirty_bitmap)
620 memslot->dirty_bitmap_head = memslot->dirty_bitmap;
623 #endif /* !CONFIG_S390 */
626 * Allocate some memory and give it an address in the guest physical address
629 * Discontiguous memory is allowed, mostly for framebuffers.
631 * Must be called holding mmap_sem for write.
633 int __kvm_set_memory_region(struct kvm *kvm,
634 struct kvm_userspace_memory_region *mem,
639 unsigned long npages;
641 struct kvm_memory_slot *memslot;
642 struct kvm_memory_slot old, new;
643 struct kvm_memslots *slots, *old_memslots;
646 /* General sanity checks */
647 if (mem->memory_size & (PAGE_SIZE - 1))
649 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
651 /* We can read the guest memory with __xxx_user() later on. */
653 ((mem->userspace_addr & (PAGE_SIZE - 1)) ||
654 !access_ok(VERIFY_WRITE,
655 (void __user *)(unsigned long)mem->userspace_addr,
658 if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
660 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
663 memslot = &kvm->memslots->memslots[mem->slot];
664 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
665 npages = mem->memory_size >> PAGE_SHIFT;
668 if (npages > KVM_MEM_MAX_NR_PAGES)
672 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
674 new = old = *memslot;
677 new.base_gfn = base_gfn;
679 new.flags = mem->flags;
681 /* Disallow changing a memory slot's size. */
683 if (npages && old.npages && npages != old.npages)
686 /* Check for overlaps */
688 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
689 struct kvm_memory_slot *s = &kvm->memslots->memslots[i];
691 if (s == memslot || !s->npages)
693 if (!((base_gfn + npages <= s->base_gfn) ||
694 (base_gfn >= s->base_gfn + s->npages)))
698 /* Free page dirty bitmap if unneeded */
699 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
700 new.dirty_bitmap = NULL;
704 /* Allocate if a slot is being created */
706 if (npages && !new.rmap) {
707 new.rmap = vzalloc(npages * sizeof(*new.rmap));
712 new.user_alloc = user_alloc;
713 new.userspace_addr = mem->userspace_addr;
718 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
724 /* Avoid unused variable warning if no large pages */
727 if (new.lpage_info[i])
730 lpages = 1 + ((base_gfn + npages - 1)
731 >> KVM_HPAGE_GFN_SHIFT(level));
732 lpages -= base_gfn >> KVM_HPAGE_GFN_SHIFT(level);
734 new.lpage_info[i] = vzalloc(lpages * sizeof(*new.lpage_info[i]));
736 if (!new.lpage_info[i])
739 if (base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1))
740 new.lpage_info[i][0].write_count = 1;
741 if ((base_gfn+npages) & (KVM_PAGES_PER_HPAGE(level) - 1))
742 new.lpage_info[i][lpages - 1].write_count = 1;
743 ugfn = new.userspace_addr >> PAGE_SHIFT;
745 * If the gfn and userspace address are not aligned wrt each
746 * other, or if explicitly asked to, disable large page
747 * support for this slot
749 if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
751 for (j = 0; j < lpages; ++j)
752 new.lpage_info[i][j].write_count = 1;
757 /* Allocate page dirty bitmap if needed */
758 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
759 if (kvm_create_dirty_bitmap(&new) < 0)
761 /* destroy any largepage mappings for dirty tracking */
763 #else /* not defined CONFIG_S390 */
764 new.user_alloc = user_alloc;
766 new.userspace_addr = mem->userspace_addr;
767 #endif /* not defined CONFIG_S390 */
771 slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
774 memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
775 if (mem->slot >= slots->nmemslots)
776 slots->nmemslots = mem->slot + 1;
778 slots->memslots[mem->slot].flags |= KVM_MEMSLOT_INVALID;
780 old_memslots = kvm->memslots;
781 rcu_assign_pointer(kvm->memslots, slots);
782 synchronize_srcu_expedited(&kvm->srcu);
783 /* From this point no new shadow pages pointing to a deleted
784 * memslot will be created.
786 * validation of sp->gfn happens in:
787 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
788 * - kvm_is_visible_gfn (mmu_check_roots)
790 kvm_arch_flush_shadow(kvm);
794 r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc);
798 /* map the pages in iommu page table */
800 r = kvm_iommu_map_pages(kvm, &new);
806 slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
809 memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
810 if (mem->slot >= slots->nmemslots)
811 slots->nmemslots = mem->slot + 1;
814 /* actual memory is freed via old in kvm_free_physmem_slot below */
817 new.dirty_bitmap = NULL;
818 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i)
819 new.lpage_info[i] = NULL;
822 slots->memslots[mem->slot] = new;
823 old_memslots = kvm->memslots;
824 rcu_assign_pointer(kvm->memslots, slots);
825 synchronize_srcu_expedited(&kvm->srcu);
827 kvm_arch_commit_memory_region(kvm, mem, old, user_alloc);
829 kvm_free_physmem_slot(&old, &new);
835 kvm_free_physmem_slot(&new, &old);
840 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
842 int kvm_set_memory_region(struct kvm *kvm,
843 struct kvm_userspace_memory_region *mem,
848 mutex_lock(&kvm->slots_lock);
849 r = __kvm_set_memory_region(kvm, mem, user_alloc);
850 mutex_unlock(&kvm->slots_lock);
853 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
855 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
857 kvm_userspace_memory_region *mem,
860 if (mem->slot >= KVM_MEMORY_SLOTS)
862 return kvm_set_memory_region(kvm, mem, user_alloc);
865 int kvm_get_dirty_log(struct kvm *kvm,
866 struct kvm_dirty_log *log, int *is_dirty)
868 struct kvm_memory_slot *memslot;
871 unsigned long any = 0;
874 if (log->slot >= KVM_MEMORY_SLOTS)
877 memslot = &kvm->memslots->memslots[log->slot];
879 if (!memslot->dirty_bitmap)
882 n = kvm_dirty_bitmap_bytes(memslot);
884 for (i = 0; !any && i < n/sizeof(long); ++i)
885 any = memslot->dirty_bitmap[i];
888 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
899 void kvm_disable_largepages(void)
901 largepages_enabled = false;
903 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
905 int is_error_page(struct page *page)
907 return page == bad_page || page == hwpoison_page || page == fault_page;
909 EXPORT_SYMBOL_GPL(is_error_page);
911 int is_error_pfn(pfn_t pfn)
913 return pfn == bad_pfn || pfn == hwpoison_pfn || pfn == fault_pfn;
915 EXPORT_SYMBOL_GPL(is_error_pfn);
917 int is_hwpoison_pfn(pfn_t pfn)
919 return pfn == hwpoison_pfn;
921 EXPORT_SYMBOL_GPL(is_hwpoison_pfn);
923 int is_fault_pfn(pfn_t pfn)
925 return pfn == fault_pfn;
927 EXPORT_SYMBOL_GPL(is_fault_pfn);
929 static inline unsigned long bad_hva(void)
934 int kvm_is_error_hva(unsigned long addr)
936 return addr == bad_hva();
938 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
940 static struct kvm_memory_slot *__gfn_to_memslot(struct kvm_memslots *slots,
945 for (i = 0; i < slots->nmemslots; ++i) {
946 struct kvm_memory_slot *memslot = &slots->memslots[i];
948 if (gfn >= memslot->base_gfn
949 && gfn < memslot->base_gfn + memslot->npages)
955 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
957 return __gfn_to_memslot(kvm_memslots(kvm), gfn);
959 EXPORT_SYMBOL_GPL(gfn_to_memslot);
961 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
964 struct kvm_memslots *slots = kvm_memslots(kvm);
966 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
967 struct kvm_memory_slot *memslot = &slots->memslots[i];
969 if (memslot->flags & KVM_MEMSLOT_INVALID)
972 if (gfn >= memslot->base_gfn
973 && gfn < memslot->base_gfn + memslot->npages)
978 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
980 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
982 struct vm_area_struct *vma;
983 unsigned long addr, size;
987 addr = gfn_to_hva(kvm, gfn);
988 if (kvm_is_error_hva(addr))
991 down_read(¤t->mm->mmap_sem);
992 vma = find_vma(current->mm, addr);
996 size = vma_kernel_pagesize(vma);
999 up_read(¤t->mm->mmap_sem);
1004 static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1007 if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
1011 *nr_pages = slot->npages - (gfn - slot->base_gfn);
1013 return gfn_to_hva_memslot(slot, gfn);
1016 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1018 return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
1020 EXPORT_SYMBOL_GPL(gfn_to_hva);
1022 static pfn_t get_fault_pfn(void)
1024 get_page(fault_page);
1028 int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm,
1029 unsigned long start, int write, struct page **page)
1031 int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET;
1034 flags |= FOLL_WRITE;
1036 return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL);
1039 static inline int check_user_page_hwpoison(unsigned long addr)
1041 int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE;
1043 rc = __get_user_pages(current, current->mm, addr, 1,
1044 flags, NULL, NULL, NULL);
1045 return rc == -EHWPOISON;
1048 static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic,
1049 bool *async, bool write_fault, bool *writable)
1051 struct page *page[1];
1055 /* we can do it either atomically or asynchronously, not both */
1056 BUG_ON(atomic && async);
1058 BUG_ON(!write_fault && !writable);
1063 if (atomic || async)
1064 npages = __get_user_pages_fast(addr, 1, 1, page);
1066 if (unlikely(npages != 1) && !atomic) {
1070 *writable = write_fault;
1073 down_read(¤t->mm->mmap_sem);
1074 npages = get_user_page_nowait(current, current->mm,
1075 addr, write_fault, page);
1076 up_read(¤t->mm->mmap_sem);
1078 npages = get_user_pages_fast(addr, 1, write_fault,
1081 /* map read fault as writable if possible */
1082 if (unlikely(!write_fault) && npages == 1) {
1083 struct page *wpage[1];
1085 npages = __get_user_pages_fast(addr, 1, 1, wpage);
1095 if (unlikely(npages != 1)) {
1096 struct vm_area_struct *vma;
1099 return get_fault_pfn();
1101 down_read(¤t->mm->mmap_sem);
1102 if (npages == -EHWPOISON ||
1103 (!async && check_user_page_hwpoison(addr))) {
1104 up_read(¤t->mm->mmap_sem);
1105 get_page(hwpoison_page);
1106 return page_to_pfn(hwpoison_page);
1109 vma = find_vma_intersection(current->mm, addr, addr+1);
1112 pfn = get_fault_pfn();
1113 else if ((vma->vm_flags & VM_PFNMAP)) {
1114 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) +
1116 BUG_ON(!kvm_is_mmio_pfn(pfn));
1118 if (async && (vma->vm_flags & VM_WRITE))
1120 pfn = get_fault_pfn();
1122 up_read(¤t->mm->mmap_sem);
1124 pfn = page_to_pfn(page[0]);
1129 pfn_t hva_to_pfn_atomic(struct kvm *kvm, unsigned long addr)
1131 return hva_to_pfn(kvm, addr, true, NULL, true, NULL);
1133 EXPORT_SYMBOL_GPL(hva_to_pfn_atomic);
1135 static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async,
1136 bool write_fault, bool *writable)
1143 addr = gfn_to_hva(kvm, gfn);
1144 if (kvm_is_error_hva(addr)) {
1146 return page_to_pfn(bad_page);
1149 return hva_to_pfn(kvm, addr, atomic, async, write_fault, writable);
1152 pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
1154 return __gfn_to_pfn(kvm, gfn, true, NULL, true, NULL);
1156 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
1158 pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async,
1159 bool write_fault, bool *writable)
1161 return __gfn_to_pfn(kvm, gfn, false, async, write_fault, writable);
1163 EXPORT_SYMBOL_GPL(gfn_to_pfn_async);
1165 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1167 return __gfn_to_pfn(kvm, gfn, false, NULL, true, NULL);
1169 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1171 pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1174 return __gfn_to_pfn(kvm, gfn, false, NULL, write_fault, writable);
1176 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
1178 pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
1179 struct kvm_memory_slot *slot, gfn_t gfn)
1181 unsigned long addr = gfn_to_hva_memslot(slot, gfn);
1182 return hva_to_pfn(kvm, addr, false, NULL, true, NULL);
1185 int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
1191 addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry);
1192 if (kvm_is_error_hva(addr))
1195 if (entry < nr_pages)
1198 return __get_user_pages_fast(addr, nr_pages, 1, pages);
1200 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
1202 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1206 pfn = gfn_to_pfn(kvm, gfn);
1207 if (!kvm_is_mmio_pfn(pfn))
1208 return pfn_to_page(pfn);
1210 WARN_ON(kvm_is_mmio_pfn(pfn));
1216 EXPORT_SYMBOL_GPL(gfn_to_page);
1218 void kvm_release_page_clean(struct page *page)
1220 kvm_release_pfn_clean(page_to_pfn(page));
1222 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1224 void kvm_release_pfn_clean(pfn_t pfn)
1226 if (!kvm_is_mmio_pfn(pfn))
1227 put_page(pfn_to_page(pfn));
1229 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1231 void kvm_release_page_dirty(struct page *page)
1233 kvm_release_pfn_dirty(page_to_pfn(page));
1235 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1237 void kvm_release_pfn_dirty(pfn_t pfn)
1239 kvm_set_pfn_dirty(pfn);
1240 kvm_release_pfn_clean(pfn);
1242 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1244 void kvm_set_page_dirty(struct page *page)
1246 kvm_set_pfn_dirty(page_to_pfn(page));
1248 EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
1250 void kvm_set_pfn_dirty(pfn_t pfn)
1252 if (!kvm_is_mmio_pfn(pfn)) {
1253 struct page *page = pfn_to_page(pfn);
1254 if (!PageReserved(page))
1258 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1260 void kvm_set_pfn_accessed(pfn_t pfn)
1262 if (!kvm_is_mmio_pfn(pfn))
1263 mark_page_accessed(pfn_to_page(pfn));
1265 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1267 void kvm_get_pfn(pfn_t pfn)
1269 if (!kvm_is_mmio_pfn(pfn))
1270 get_page(pfn_to_page(pfn));
1272 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1274 static int next_segment(unsigned long len, int offset)
1276 if (len > PAGE_SIZE - offset)
1277 return PAGE_SIZE - offset;
1282 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1288 addr = gfn_to_hva(kvm, gfn);
1289 if (kvm_is_error_hva(addr))
1291 r = __copy_from_user(data, (void __user *)addr + offset, len);
1296 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1298 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1300 gfn_t gfn = gpa >> PAGE_SHIFT;
1302 int offset = offset_in_page(gpa);
1305 while ((seg = next_segment(len, offset)) != 0) {
1306 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1316 EXPORT_SYMBOL_GPL(kvm_read_guest);
1318 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1323 gfn_t gfn = gpa >> PAGE_SHIFT;
1324 int offset = offset_in_page(gpa);
1326 addr = gfn_to_hva(kvm, gfn);
1327 if (kvm_is_error_hva(addr))
1329 pagefault_disable();
1330 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1336 EXPORT_SYMBOL(kvm_read_guest_atomic);
1338 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1339 int offset, int len)
1344 addr = gfn_to_hva(kvm, gfn);
1345 if (kvm_is_error_hva(addr))
1347 r = copy_to_user((void __user *)addr + offset, data, len);
1350 mark_page_dirty(kvm, gfn);
1353 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1355 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1358 gfn_t gfn = gpa >> PAGE_SHIFT;
1360 int offset = offset_in_page(gpa);
1363 while ((seg = next_segment(len, offset)) != 0) {
1364 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1375 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1378 struct kvm_memslots *slots = kvm_memslots(kvm);
1379 int offset = offset_in_page(gpa);
1380 gfn_t gfn = gpa >> PAGE_SHIFT;
1383 ghc->generation = slots->generation;
1384 ghc->memslot = __gfn_to_memslot(slots, gfn);
1385 ghc->hva = gfn_to_hva_many(ghc->memslot, gfn, NULL);
1386 if (!kvm_is_error_hva(ghc->hva))
1393 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
1395 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1396 void *data, unsigned long len)
1398 struct kvm_memslots *slots = kvm_memslots(kvm);
1401 if (slots->generation != ghc->generation)
1402 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
1404 if (kvm_is_error_hva(ghc->hva))
1407 r = copy_to_user((void __user *)ghc->hva, data, len);
1410 mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT);
1414 EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
1416 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1418 return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page,
1421 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1423 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1425 gfn_t gfn = gpa >> PAGE_SHIFT;
1427 int offset = offset_in_page(gpa);
1430 while ((seg = next_segment(len, offset)) != 0) {
1431 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1440 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1442 void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot,
1445 if (memslot && memslot->dirty_bitmap) {
1446 unsigned long rel_gfn = gfn - memslot->base_gfn;
1448 __set_bit_le(rel_gfn, memslot->dirty_bitmap);
1452 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1454 struct kvm_memory_slot *memslot;
1456 memslot = gfn_to_memslot(kvm, gfn);
1457 mark_page_dirty_in_slot(kvm, memslot, gfn);
1461 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1463 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1468 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1470 if (kvm_arch_vcpu_runnable(vcpu)) {
1471 kvm_make_request(KVM_REQ_UNHALT, vcpu);
1474 if (kvm_cpu_has_pending_timer(vcpu))
1476 if (signal_pending(current))
1482 finish_wait(&vcpu->wq, &wait);
1485 void kvm_resched(struct kvm_vcpu *vcpu)
1487 if (!need_resched())
1491 EXPORT_SYMBOL_GPL(kvm_resched);
1493 void kvm_vcpu_on_spin(struct kvm_vcpu *me)
1495 struct kvm *kvm = me->kvm;
1496 struct kvm_vcpu *vcpu;
1497 int last_boosted_vcpu = me->kvm->last_boosted_vcpu;
1503 * We boost the priority of a VCPU that is runnable but not
1504 * currently running, because it got preempted by something
1505 * else and called schedule in __vcpu_run. Hopefully that
1506 * VCPU is holding the lock that we need and will release it.
1507 * We approximate round-robin by starting at the last boosted VCPU.
1509 for (pass = 0; pass < 2 && !yielded; pass++) {
1510 kvm_for_each_vcpu(i, vcpu, kvm) {
1511 struct task_struct *task = NULL;
1513 if (!pass && i < last_boosted_vcpu) {
1514 i = last_boosted_vcpu;
1516 } else if (pass && i > last_boosted_vcpu)
1520 if (waitqueue_active(&vcpu->wq))
1523 pid = rcu_dereference(vcpu->pid);
1525 task = get_pid_task(vcpu->pid, PIDTYPE_PID);
1529 if (task->flags & PF_VCPU) {
1530 put_task_struct(task);
1533 if (yield_to(task, 1)) {
1534 put_task_struct(task);
1535 kvm->last_boosted_vcpu = i;
1539 put_task_struct(task);
1543 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
1545 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1547 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1550 if (vmf->pgoff == 0)
1551 page = virt_to_page(vcpu->run);
1553 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
1554 page = virt_to_page(vcpu->arch.pio_data);
1556 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1557 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1558 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1561 return VM_FAULT_SIGBUS;
1567 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
1568 .fault = kvm_vcpu_fault,
1571 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1573 vma->vm_ops = &kvm_vcpu_vm_ops;
1577 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1579 struct kvm_vcpu *vcpu = filp->private_data;
1581 kvm_put_kvm(vcpu->kvm);
1585 static struct file_operations kvm_vcpu_fops = {
1586 .release = kvm_vcpu_release,
1587 .unlocked_ioctl = kvm_vcpu_ioctl,
1588 .compat_ioctl = kvm_vcpu_ioctl,
1589 .mmap = kvm_vcpu_mmap,
1590 .llseek = noop_llseek,
1594 * Allocates an inode for the vcpu.
1596 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1598 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR);
1602 * Creates some virtual cpus. Good luck creating more than one.
1604 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
1607 struct kvm_vcpu *vcpu, *v;
1609 vcpu = kvm_arch_vcpu_create(kvm, id);
1611 return PTR_ERR(vcpu);
1613 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1615 r = kvm_arch_vcpu_setup(vcpu);
1619 mutex_lock(&kvm->lock);
1620 if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
1625 kvm_for_each_vcpu(r, v, kvm)
1626 if (v->vcpu_id == id) {
1631 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
1633 /* Now it's all set up, let userspace reach it */
1635 r = create_vcpu_fd(vcpu);
1641 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
1643 atomic_inc(&kvm->online_vcpus);
1645 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1646 if (kvm->bsp_vcpu_id == id)
1647 kvm->bsp_vcpu = vcpu;
1649 mutex_unlock(&kvm->lock);
1653 mutex_unlock(&kvm->lock);
1654 kvm_arch_vcpu_destroy(vcpu);
1658 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1661 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1662 vcpu->sigset_active = 1;
1663 vcpu->sigset = *sigset;
1665 vcpu->sigset_active = 0;
1669 static long kvm_vcpu_ioctl(struct file *filp,
1670 unsigned int ioctl, unsigned long arg)
1672 struct kvm_vcpu *vcpu = filp->private_data;
1673 void __user *argp = (void __user *)arg;
1675 struct kvm_fpu *fpu = NULL;
1676 struct kvm_sregs *kvm_sregs = NULL;
1678 if (vcpu->kvm->mm != current->mm)
1681 #if defined(CONFIG_S390) || defined(CONFIG_PPC)
1683 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1684 * so vcpu_load() would break it.
1686 if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT)
1687 return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1697 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
1698 trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
1700 case KVM_GET_REGS: {
1701 struct kvm_regs *kvm_regs;
1704 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1707 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
1711 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1718 case KVM_SET_REGS: {
1719 struct kvm_regs *kvm_regs;
1722 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1726 if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs)))
1728 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
1736 case KVM_GET_SREGS: {
1737 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1741 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
1745 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
1750 case KVM_SET_SREGS: {
1751 kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1756 if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs)))
1758 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
1764 case KVM_GET_MP_STATE: {
1765 struct kvm_mp_state mp_state;
1767 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
1771 if (copy_to_user(argp, &mp_state, sizeof mp_state))
1776 case KVM_SET_MP_STATE: {
1777 struct kvm_mp_state mp_state;
1780 if (copy_from_user(&mp_state, argp, sizeof mp_state))
1782 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
1788 case KVM_TRANSLATE: {
1789 struct kvm_translation tr;
1792 if (copy_from_user(&tr, argp, sizeof tr))
1794 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
1798 if (copy_to_user(argp, &tr, sizeof tr))
1803 case KVM_SET_GUEST_DEBUG: {
1804 struct kvm_guest_debug dbg;
1807 if (copy_from_user(&dbg, argp, sizeof dbg))
1809 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
1815 case KVM_SET_SIGNAL_MASK: {
1816 struct kvm_signal_mask __user *sigmask_arg = argp;
1817 struct kvm_signal_mask kvm_sigmask;
1818 sigset_t sigset, *p;
1823 if (copy_from_user(&kvm_sigmask, argp,
1824 sizeof kvm_sigmask))
1827 if (kvm_sigmask.len != sizeof sigset)
1830 if (copy_from_user(&sigset, sigmask_arg->sigset,
1835 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
1839 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1843 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
1847 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
1853 fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1858 if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu)))
1860 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
1867 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1876 static long kvm_vm_ioctl(struct file *filp,
1877 unsigned int ioctl, unsigned long arg)
1879 struct kvm *kvm = filp->private_data;
1880 void __user *argp = (void __user *)arg;
1883 if (kvm->mm != current->mm)
1886 case KVM_CREATE_VCPU:
1887 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
1891 case KVM_SET_USER_MEMORY_REGION: {
1892 struct kvm_userspace_memory_region kvm_userspace_mem;
1895 if (copy_from_user(&kvm_userspace_mem, argp,
1896 sizeof kvm_userspace_mem))
1899 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
1904 case KVM_GET_DIRTY_LOG: {
1905 struct kvm_dirty_log log;
1908 if (copy_from_user(&log, argp, sizeof log))
1910 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
1915 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1916 case KVM_REGISTER_COALESCED_MMIO: {
1917 struct kvm_coalesced_mmio_zone zone;
1919 if (copy_from_user(&zone, argp, sizeof zone))
1921 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
1927 case KVM_UNREGISTER_COALESCED_MMIO: {
1928 struct kvm_coalesced_mmio_zone zone;
1930 if (copy_from_user(&zone, argp, sizeof zone))
1932 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
1940 struct kvm_irqfd data;
1943 if (copy_from_user(&data, argp, sizeof data))
1945 r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags);
1948 case KVM_IOEVENTFD: {
1949 struct kvm_ioeventfd data;
1952 if (copy_from_user(&data, argp, sizeof data))
1954 r = kvm_ioeventfd(kvm, &data);
1957 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1958 case KVM_SET_BOOT_CPU_ID:
1960 mutex_lock(&kvm->lock);
1961 if (atomic_read(&kvm->online_vcpus) != 0)
1964 kvm->bsp_vcpu_id = arg;
1965 mutex_unlock(&kvm->lock);
1969 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
1971 r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
1977 #ifdef CONFIG_COMPAT
1978 struct compat_kvm_dirty_log {
1982 compat_uptr_t dirty_bitmap; /* one bit per page */
1987 static long kvm_vm_compat_ioctl(struct file *filp,
1988 unsigned int ioctl, unsigned long arg)
1990 struct kvm *kvm = filp->private_data;
1993 if (kvm->mm != current->mm)
1996 case KVM_GET_DIRTY_LOG: {
1997 struct compat_kvm_dirty_log compat_log;
1998 struct kvm_dirty_log log;
2001 if (copy_from_user(&compat_log, (void __user *)arg,
2002 sizeof(compat_log)))
2004 log.slot = compat_log.slot;
2005 log.padding1 = compat_log.padding1;
2006 log.padding2 = compat_log.padding2;
2007 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
2009 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2015 r = kvm_vm_ioctl(filp, ioctl, arg);
2023 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2025 struct page *page[1];
2028 gfn_t gfn = vmf->pgoff;
2029 struct kvm *kvm = vma->vm_file->private_data;
2031 addr = gfn_to_hva(kvm, gfn);
2032 if (kvm_is_error_hva(addr))
2033 return VM_FAULT_SIGBUS;
2035 npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
2037 if (unlikely(npages != 1))
2038 return VM_FAULT_SIGBUS;
2040 vmf->page = page[0];
2044 static const struct vm_operations_struct kvm_vm_vm_ops = {
2045 .fault = kvm_vm_fault,
2048 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2050 vma->vm_ops = &kvm_vm_vm_ops;
2054 static struct file_operations kvm_vm_fops = {
2055 .release = kvm_vm_release,
2056 .unlocked_ioctl = kvm_vm_ioctl,
2057 #ifdef CONFIG_COMPAT
2058 .compat_ioctl = kvm_vm_compat_ioctl,
2060 .mmap = kvm_vm_mmap,
2061 .llseek = noop_llseek,
2064 static int kvm_dev_ioctl_create_vm(void)
2069 kvm = kvm_create_vm();
2071 return PTR_ERR(kvm);
2072 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2073 r = kvm_coalesced_mmio_init(kvm);
2079 r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
2086 static long kvm_dev_ioctl_check_extension_generic(long arg)
2089 case KVM_CAP_USER_MEMORY:
2090 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
2091 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
2092 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2093 case KVM_CAP_SET_BOOT_CPU_ID:
2095 case KVM_CAP_INTERNAL_ERROR_DATA:
2097 #ifdef CONFIG_HAVE_KVM_IRQCHIP
2098 case KVM_CAP_IRQ_ROUTING:
2099 return KVM_MAX_IRQ_ROUTES;
2104 return kvm_dev_ioctl_check_extension(arg);
2107 static long kvm_dev_ioctl(struct file *filp,
2108 unsigned int ioctl, unsigned long arg)
2113 case KVM_GET_API_VERSION:
2117 r = KVM_API_VERSION;
2123 r = kvm_dev_ioctl_create_vm();
2125 case KVM_CHECK_EXTENSION:
2126 r = kvm_dev_ioctl_check_extension_generic(arg);
2128 case KVM_GET_VCPU_MMAP_SIZE:
2132 r = PAGE_SIZE; /* struct kvm_run */
2134 r += PAGE_SIZE; /* pio data page */
2136 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2137 r += PAGE_SIZE; /* coalesced mmio ring page */
2140 case KVM_TRACE_ENABLE:
2141 case KVM_TRACE_PAUSE:
2142 case KVM_TRACE_DISABLE:
2146 return kvm_arch_dev_ioctl(filp, ioctl, arg);
2152 static struct file_operations kvm_chardev_ops = {
2153 .unlocked_ioctl = kvm_dev_ioctl,
2154 .compat_ioctl = kvm_dev_ioctl,
2155 .llseek = noop_llseek,
2158 static struct miscdevice kvm_dev = {
2164 static void hardware_enable_nolock(void *junk)
2166 int cpu = raw_smp_processor_id();
2169 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
2172 cpumask_set_cpu(cpu, cpus_hardware_enabled);
2174 r = kvm_arch_hardware_enable(NULL);
2177 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2178 atomic_inc(&hardware_enable_failed);
2179 printk(KERN_INFO "kvm: enabling virtualization on "
2180 "CPU%d failed\n", cpu);
2184 static void hardware_enable(void *junk)
2186 raw_spin_lock(&kvm_lock);
2187 hardware_enable_nolock(junk);
2188 raw_spin_unlock(&kvm_lock);
2191 static void hardware_disable_nolock(void *junk)
2193 int cpu = raw_smp_processor_id();
2195 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
2197 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2198 kvm_arch_hardware_disable(NULL);
2201 static void hardware_disable(void *junk)
2203 raw_spin_lock(&kvm_lock);
2204 hardware_disable_nolock(junk);
2205 raw_spin_unlock(&kvm_lock);
2208 static void hardware_disable_all_nolock(void)
2210 BUG_ON(!kvm_usage_count);
2213 if (!kvm_usage_count)
2214 on_each_cpu(hardware_disable_nolock, NULL, 1);
2217 static void hardware_disable_all(void)
2219 raw_spin_lock(&kvm_lock);
2220 hardware_disable_all_nolock();
2221 raw_spin_unlock(&kvm_lock);
2224 static int hardware_enable_all(void)
2228 raw_spin_lock(&kvm_lock);
2231 if (kvm_usage_count == 1) {
2232 atomic_set(&hardware_enable_failed, 0);
2233 on_each_cpu(hardware_enable_nolock, NULL, 1);
2235 if (atomic_read(&hardware_enable_failed)) {
2236 hardware_disable_all_nolock();
2241 raw_spin_unlock(&kvm_lock);
2246 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2251 if (!kvm_usage_count)
2254 val &= ~CPU_TASKS_FROZEN;
2257 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2259 hardware_disable(NULL);
2262 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2264 hardware_enable(NULL);
2271 asmlinkage void kvm_spurious_fault(void)
2273 /* Fault while not rebooting. We want the trace. */
2276 EXPORT_SYMBOL_GPL(kvm_spurious_fault);
2278 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2282 * Some (well, at least mine) BIOSes hang on reboot if
2285 * And Intel TXT required VMX off for all cpu when system shutdown.
2287 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2288 kvm_rebooting = true;
2289 on_each_cpu(hardware_disable_nolock, NULL, 1);
2293 static struct notifier_block kvm_reboot_notifier = {
2294 .notifier_call = kvm_reboot,
2298 static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
2302 for (i = 0; i < bus->dev_count; i++) {
2303 struct kvm_io_device *pos = bus->devs[i];
2305 kvm_iodevice_destructor(pos);
2310 /* kvm_io_bus_write - called under kvm->slots_lock */
2311 int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2312 int len, const void *val)
2315 struct kvm_io_bus *bus;
2317 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2318 for (i = 0; i < bus->dev_count; i++)
2319 if (!kvm_iodevice_write(bus->devs[i], addr, len, val))
2324 /* kvm_io_bus_read - called under kvm->slots_lock */
2325 int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2329 struct kvm_io_bus *bus;
2331 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2332 for (i = 0; i < bus->dev_count; i++)
2333 if (!kvm_iodevice_read(bus->devs[i], addr, len, val))
2338 /* Caller must hold slots_lock. */
2339 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2340 struct kvm_io_device *dev)
2342 struct kvm_io_bus *new_bus, *bus;
2344 bus = kvm->buses[bus_idx];
2345 if (bus->dev_count > NR_IOBUS_DEVS-1)
2348 new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL);
2351 memcpy(new_bus, bus, sizeof(struct kvm_io_bus));
2352 new_bus->devs[new_bus->dev_count++] = dev;
2353 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2354 synchronize_srcu_expedited(&kvm->srcu);
2360 /* Caller must hold slots_lock. */
2361 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2362 struct kvm_io_device *dev)
2365 struct kvm_io_bus *new_bus, *bus;
2367 new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL);
2371 bus = kvm->buses[bus_idx];
2372 memcpy(new_bus, bus, sizeof(struct kvm_io_bus));
2375 for (i = 0; i < new_bus->dev_count; i++)
2376 if (new_bus->devs[i] == dev) {
2378 new_bus->devs[i] = new_bus->devs[--new_bus->dev_count];
2387 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2388 synchronize_srcu_expedited(&kvm->srcu);
2393 static struct notifier_block kvm_cpu_notifier = {
2394 .notifier_call = kvm_cpu_hotplug,
2397 static int vm_stat_get(void *_offset, u64 *val)
2399 unsigned offset = (long)_offset;
2403 raw_spin_lock(&kvm_lock);
2404 list_for_each_entry(kvm, &vm_list, vm_list)
2405 *val += *(u32 *)((void *)kvm + offset);
2406 raw_spin_unlock(&kvm_lock);
2410 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
2412 static int vcpu_stat_get(void *_offset, u64 *val)
2414 unsigned offset = (long)_offset;
2416 struct kvm_vcpu *vcpu;
2420 raw_spin_lock(&kvm_lock);
2421 list_for_each_entry(kvm, &vm_list, vm_list)
2422 kvm_for_each_vcpu(i, vcpu, kvm)
2423 *val += *(u32 *)((void *)vcpu + offset);
2425 raw_spin_unlock(&kvm_lock);
2429 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
2431 static const struct file_operations *stat_fops[] = {
2432 [KVM_STAT_VCPU] = &vcpu_stat_fops,
2433 [KVM_STAT_VM] = &vm_stat_fops,
2436 static void kvm_init_debug(void)
2438 struct kvm_stats_debugfs_item *p;
2440 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
2441 for (p = debugfs_entries; p->name; ++p)
2442 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
2443 (void *)(long)p->offset,
2444 stat_fops[p->kind]);
2447 static void kvm_exit_debug(void)
2449 struct kvm_stats_debugfs_item *p;
2451 for (p = debugfs_entries; p->name; ++p)
2452 debugfs_remove(p->dentry);
2453 debugfs_remove(kvm_debugfs_dir);
2456 static int kvm_suspend(void)
2458 if (kvm_usage_count)
2459 hardware_disable_nolock(NULL);
2463 static void kvm_resume(void)
2465 if (kvm_usage_count) {
2466 WARN_ON(raw_spin_is_locked(&kvm_lock));
2467 hardware_enable_nolock(NULL);
2471 static struct syscore_ops kvm_syscore_ops = {
2472 .suspend = kvm_suspend,
2473 .resume = kvm_resume,
2476 struct page *bad_page;
2480 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
2482 return container_of(pn, struct kvm_vcpu, preempt_notifier);
2485 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
2487 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2489 kvm_arch_vcpu_load(vcpu, cpu);
2492 static void kvm_sched_out(struct preempt_notifier *pn,
2493 struct task_struct *next)
2495 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2497 kvm_arch_vcpu_put(vcpu);
2500 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
2501 struct module *module)
2506 r = kvm_arch_init(opaque);
2510 bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2512 if (bad_page == NULL) {
2517 bad_pfn = page_to_pfn(bad_page);
2519 hwpoison_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2521 if (hwpoison_page == NULL) {
2526 hwpoison_pfn = page_to_pfn(hwpoison_page);
2528 fault_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2530 if (fault_page == NULL) {
2535 fault_pfn = page_to_pfn(fault_page);
2537 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
2542 r = kvm_arch_hardware_setup();
2546 for_each_online_cpu(cpu) {
2547 smp_call_function_single(cpu,
2548 kvm_arch_check_processor_compat,
2554 r = register_cpu_notifier(&kvm_cpu_notifier);
2557 register_reboot_notifier(&kvm_reboot_notifier);
2559 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2561 vcpu_align = __alignof__(struct kvm_vcpu);
2562 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
2564 if (!kvm_vcpu_cache) {
2569 r = kvm_async_pf_init();
2573 kvm_chardev_ops.owner = module;
2574 kvm_vm_fops.owner = module;
2575 kvm_vcpu_fops.owner = module;
2577 r = misc_register(&kvm_dev);
2579 printk(KERN_ERR "kvm: misc device register failed\n");
2583 register_syscore_ops(&kvm_syscore_ops);
2585 kvm_preempt_ops.sched_in = kvm_sched_in;
2586 kvm_preempt_ops.sched_out = kvm_sched_out;
2593 kvm_async_pf_deinit();
2595 kmem_cache_destroy(kvm_vcpu_cache);
2597 unregister_reboot_notifier(&kvm_reboot_notifier);
2598 unregister_cpu_notifier(&kvm_cpu_notifier);
2601 kvm_arch_hardware_unsetup();
2603 free_cpumask_var(cpus_hardware_enabled);
2606 __free_page(fault_page);
2608 __free_page(hwpoison_page);
2609 __free_page(bad_page);
2615 EXPORT_SYMBOL_GPL(kvm_init);
2620 misc_deregister(&kvm_dev);
2621 kmem_cache_destroy(kvm_vcpu_cache);
2622 kvm_async_pf_deinit();
2623 unregister_syscore_ops(&kvm_syscore_ops);
2624 unregister_reboot_notifier(&kvm_reboot_notifier);
2625 unregister_cpu_notifier(&kvm_cpu_notifier);
2626 on_each_cpu(hardware_disable_nolock, NULL, 1);
2627 kvm_arch_hardware_unsetup();
2629 free_cpumask_var(cpus_hardware_enabled);
2630 __free_page(hwpoison_page);
2631 __free_page(bad_page);
2633 EXPORT_SYMBOL_GPL(kvm_exit);