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>
50 #include <linux/sort.h>
51 #include <linux/bsearch.h>
53 #include <asm/processor.h>
55 #include <asm/uaccess.h>
56 #include <asm/pgtable.h>
58 #include "coalesced_mmio.h"
61 #define CREATE_TRACE_POINTS
62 #include <trace/events/kvm.h>
64 MODULE_AUTHOR("Qumranet");
65 MODULE_LICENSE("GPL");
70 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
73 DEFINE_RAW_SPINLOCK(kvm_lock);
76 static cpumask_var_t cpus_hardware_enabled;
77 static int kvm_usage_count = 0;
78 static atomic_t hardware_enable_failed;
80 struct kmem_cache *kvm_vcpu_cache;
81 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
83 static __read_mostly struct preempt_ops kvm_preempt_ops;
85 struct dentry *kvm_debugfs_dir;
87 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
90 static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl,
93 static int hardware_enable_all(void);
94 static void hardware_disable_all(void);
96 static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
99 EXPORT_SYMBOL_GPL(kvm_rebooting);
101 static bool largepages_enabled = true;
103 bool 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 int vcpu_load(struct kvm_vcpu *vcpu)
138 if (mutex_lock_killable(&vcpu->mutex))
140 if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) {
141 /* The thread running this VCPU changed. */
142 struct pid *oldpid = vcpu->pid;
143 struct pid *newpid = get_task_pid(current, PIDTYPE_PID);
144 rcu_assign_pointer(vcpu->pid, newpid);
149 preempt_notifier_register(&vcpu->preempt_notifier);
150 kvm_arch_vcpu_load(vcpu, cpu);
155 void vcpu_put(struct kvm_vcpu *vcpu)
158 kvm_arch_vcpu_put(vcpu);
159 preempt_notifier_unregister(&vcpu->preempt_notifier);
161 mutex_unlock(&vcpu->mutex);
164 static void ack_flush(void *_completed)
168 static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
173 struct kvm_vcpu *vcpu;
175 zalloc_cpumask_var(&cpus, GFP_ATOMIC);
178 kvm_for_each_vcpu(i, vcpu, kvm) {
179 kvm_make_request(req, vcpu);
182 /* Set ->requests bit before we read ->mode */
185 if (cpus != NULL && cpu != -1 && cpu != me &&
186 kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE)
187 cpumask_set_cpu(cpu, cpus);
189 if (unlikely(cpus == NULL))
190 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
191 else if (!cpumask_empty(cpus))
192 smp_call_function_many(cpus, ack_flush, NULL, 1);
196 free_cpumask_var(cpus);
200 void kvm_flush_remote_tlbs(struct kvm *kvm)
202 long dirty_count = kvm->tlbs_dirty;
205 if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
206 ++kvm->stat.remote_tlb_flush;
207 cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
210 void kvm_reload_remote_mmus(struct kvm *kvm)
212 make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
215 void kvm_make_mclock_inprogress_request(struct kvm *kvm)
217 make_all_cpus_request(kvm, KVM_REQ_MCLOCK_INPROGRESS);
220 void kvm_make_scan_ioapic_request(struct kvm *kvm)
222 make_all_cpus_request(kvm, KVM_REQ_SCAN_IOAPIC);
225 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
230 mutex_init(&vcpu->mutex);
235 init_waitqueue_head(&vcpu->wq);
236 kvm_async_pf_vcpu_init(vcpu);
238 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
243 vcpu->run = page_address(page);
245 kvm_vcpu_set_in_spin_loop(vcpu, false);
246 kvm_vcpu_set_dy_eligible(vcpu, false);
247 vcpu->preempted = false;
249 r = kvm_arch_vcpu_init(vcpu);
255 free_page((unsigned long)vcpu->run);
259 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
261 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
264 kvm_arch_vcpu_uninit(vcpu);
265 free_page((unsigned long)vcpu->run);
267 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
269 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
270 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
272 return container_of(mn, struct kvm, mmu_notifier);
275 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
276 struct mm_struct *mm,
277 unsigned long address)
279 struct kvm *kvm = mmu_notifier_to_kvm(mn);
280 int need_tlb_flush, idx;
283 * When ->invalidate_page runs, the linux pte has been zapped
284 * already but the page is still allocated until
285 * ->invalidate_page returns. So if we increase the sequence
286 * here the kvm page fault will notice if the spte can't be
287 * established because the page is going to be freed. If
288 * instead the kvm page fault establishes the spte before
289 * ->invalidate_page runs, kvm_unmap_hva will release it
292 * The sequence increase only need to be seen at spin_unlock
293 * time, and not at spin_lock time.
295 * Increasing the sequence after the spin_unlock would be
296 * unsafe because the kvm page fault could then establish the
297 * pte after kvm_unmap_hva returned, without noticing the page
298 * is going to be freed.
300 idx = srcu_read_lock(&kvm->srcu);
301 spin_lock(&kvm->mmu_lock);
303 kvm->mmu_notifier_seq++;
304 need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty;
305 /* we've to flush the tlb before the pages can be freed */
307 kvm_flush_remote_tlbs(kvm);
309 spin_unlock(&kvm->mmu_lock);
310 srcu_read_unlock(&kvm->srcu, idx);
313 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
314 struct mm_struct *mm,
315 unsigned long address,
318 struct kvm *kvm = mmu_notifier_to_kvm(mn);
321 idx = srcu_read_lock(&kvm->srcu);
322 spin_lock(&kvm->mmu_lock);
323 kvm->mmu_notifier_seq++;
324 kvm_set_spte_hva(kvm, address, pte);
325 spin_unlock(&kvm->mmu_lock);
326 srcu_read_unlock(&kvm->srcu, idx);
329 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
330 struct mm_struct *mm,
334 struct kvm *kvm = mmu_notifier_to_kvm(mn);
335 int need_tlb_flush = 0, idx;
337 idx = srcu_read_lock(&kvm->srcu);
338 spin_lock(&kvm->mmu_lock);
340 * The count increase must become visible at unlock time as no
341 * spte can be established without taking the mmu_lock and
342 * count is also read inside the mmu_lock critical section.
344 kvm->mmu_notifier_count++;
345 need_tlb_flush = kvm_unmap_hva_range(kvm, start, end);
346 need_tlb_flush |= kvm->tlbs_dirty;
347 /* we've to flush the tlb before the pages can be freed */
349 kvm_flush_remote_tlbs(kvm);
351 spin_unlock(&kvm->mmu_lock);
352 srcu_read_unlock(&kvm->srcu, idx);
355 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
356 struct mm_struct *mm,
360 struct kvm *kvm = mmu_notifier_to_kvm(mn);
362 spin_lock(&kvm->mmu_lock);
364 * This sequence increase will notify the kvm page fault that
365 * the page that is going to be mapped in the spte could have
368 kvm->mmu_notifier_seq++;
371 * The above sequence increase must be visible before the
372 * below count decrease, which is ensured by the smp_wmb above
373 * in conjunction with the smp_rmb in mmu_notifier_retry().
375 kvm->mmu_notifier_count--;
376 spin_unlock(&kvm->mmu_lock);
378 BUG_ON(kvm->mmu_notifier_count < 0);
381 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
382 struct mm_struct *mm,
383 unsigned long address)
385 struct kvm *kvm = mmu_notifier_to_kvm(mn);
388 idx = srcu_read_lock(&kvm->srcu);
389 spin_lock(&kvm->mmu_lock);
391 young = kvm_age_hva(kvm, address);
393 kvm_flush_remote_tlbs(kvm);
395 spin_unlock(&kvm->mmu_lock);
396 srcu_read_unlock(&kvm->srcu, idx);
401 static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn,
402 struct mm_struct *mm,
403 unsigned long address)
405 struct kvm *kvm = mmu_notifier_to_kvm(mn);
408 idx = srcu_read_lock(&kvm->srcu);
409 spin_lock(&kvm->mmu_lock);
410 young = kvm_test_age_hva(kvm, address);
411 spin_unlock(&kvm->mmu_lock);
412 srcu_read_unlock(&kvm->srcu, idx);
417 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
418 struct mm_struct *mm)
420 struct kvm *kvm = mmu_notifier_to_kvm(mn);
423 idx = srcu_read_lock(&kvm->srcu);
424 kvm_arch_flush_shadow_all(kvm);
425 srcu_read_unlock(&kvm->srcu, idx);
428 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
429 .invalidate_page = kvm_mmu_notifier_invalidate_page,
430 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
431 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
432 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
433 .test_young = kvm_mmu_notifier_test_young,
434 .change_pte = kvm_mmu_notifier_change_pte,
435 .release = kvm_mmu_notifier_release,
438 static int kvm_init_mmu_notifier(struct kvm *kvm)
440 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
441 return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
444 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
446 static int kvm_init_mmu_notifier(struct kvm *kvm)
451 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
453 static void kvm_init_memslots_id(struct kvm *kvm)
456 struct kvm_memslots *slots = kvm->memslots;
458 for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
459 slots->id_to_index[i] = slots->memslots[i].id = i;
462 static struct kvm *kvm_create_vm(unsigned long type)
465 struct kvm *kvm = kvm_arch_alloc_vm();
468 return ERR_PTR(-ENOMEM);
470 r = kvm_arch_init_vm(kvm, type);
472 goto out_err_nodisable;
474 r = hardware_enable_all();
476 goto out_err_nodisable;
478 #ifdef CONFIG_HAVE_KVM_IRQCHIP
479 INIT_HLIST_HEAD(&kvm->mask_notifier_list);
480 INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
483 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX);
486 kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
489 kvm_init_memslots_id(kvm);
490 if (init_srcu_struct(&kvm->srcu))
492 for (i = 0; i < KVM_NR_BUSES; i++) {
493 kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus),
499 spin_lock_init(&kvm->mmu_lock);
500 kvm->mm = current->mm;
501 atomic_inc(&kvm->mm->mm_count);
502 kvm_eventfd_init(kvm);
503 mutex_init(&kvm->lock);
504 mutex_init(&kvm->irq_lock);
505 mutex_init(&kvm->slots_lock);
506 atomic_set(&kvm->users_count, 1);
507 INIT_LIST_HEAD(&kvm->devices);
509 r = kvm_init_mmu_notifier(kvm);
513 raw_spin_lock(&kvm_lock);
514 list_add(&kvm->vm_list, &vm_list);
515 raw_spin_unlock(&kvm_lock);
520 cleanup_srcu_struct(&kvm->srcu);
522 hardware_disable_all();
524 for (i = 0; i < KVM_NR_BUSES; i++)
525 kfree(kvm->buses[i]);
526 kfree(kvm->memslots);
527 kvm_arch_free_vm(kvm);
532 * Avoid using vmalloc for a small buffer.
533 * Should not be used when the size is statically known.
535 void *kvm_kvzalloc(unsigned long size)
537 if (size > PAGE_SIZE)
538 return vzalloc(size);
540 return kzalloc(size, GFP_KERNEL);
543 void kvm_kvfree(const void *addr)
545 if (is_vmalloc_addr(addr))
551 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
553 if (!memslot->dirty_bitmap)
556 kvm_kvfree(memslot->dirty_bitmap);
557 memslot->dirty_bitmap = NULL;
561 * Free any memory in @free but not in @dont.
563 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
564 struct kvm_memory_slot *dont)
566 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
567 kvm_destroy_dirty_bitmap(free);
569 kvm_arch_free_memslot(free, dont);
574 void kvm_free_physmem(struct kvm *kvm)
576 struct kvm_memslots *slots = kvm->memslots;
577 struct kvm_memory_slot *memslot;
579 kvm_for_each_memslot(memslot, slots)
580 kvm_free_physmem_slot(memslot, NULL);
582 kfree(kvm->memslots);
585 static void kvm_destroy_devices(struct kvm *kvm)
587 struct list_head *node, *tmp;
589 list_for_each_safe(node, tmp, &kvm->devices) {
590 struct kvm_device *dev =
591 list_entry(node, struct kvm_device, vm_node);
594 dev->ops->destroy(dev);
598 static void kvm_destroy_vm(struct kvm *kvm)
601 struct mm_struct *mm = kvm->mm;
603 kvm_arch_sync_events(kvm);
604 raw_spin_lock(&kvm_lock);
605 list_del(&kvm->vm_list);
606 raw_spin_unlock(&kvm_lock);
607 kvm_free_irq_routing(kvm);
608 for (i = 0; i < KVM_NR_BUSES; i++)
609 kvm_io_bus_destroy(kvm->buses[i]);
610 kvm_coalesced_mmio_free(kvm);
611 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
612 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
614 kvm_arch_flush_shadow_all(kvm);
616 kvm_arch_destroy_vm(kvm);
617 kvm_destroy_devices(kvm);
618 kvm_free_physmem(kvm);
619 cleanup_srcu_struct(&kvm->srcu);
620 kvm_arch_free_vm(kvm);
621 hardware_disable_all();
625 void kvm_get_kvm(struct kvm *kvm)
627 atomic_inc(&kvm->users_count);
629 EXPORT_SYMBOL_GPL(kvm_get_kvm);
631 void kvm_put_kvm(struct kvm *kvm)
633 if (atomic_dec_and_test(&kvm->users_count))
636 EXPORT_SYMBOL_GPL(kvm_put_kvm);
639 static int kvm_vm_release(struct inode *inode, struct file *filp)
641 struct kvm *kvm = filp->private_data;
643 kvm_irqfd_release(kvm);
650 * Allocation size is twice as large as the actual dirty bitmap size.
651 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
653 static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
656 unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
658 memslot->dirty_bitmap = kvm_kvzalloc(dirty_bytes);
659 if (!memslot->dirty_bitmap)
662 #endif /* !CONFIG_S390 */
666 static int cmp_memslot(const void *slot1, const void *slot2)
668 struct kvm_memory_slot *s1, *s2;
670 s1 = (struct kvm_memory_slot *)slot1;
671 s2 = (struct kvm_memory_slot *)slot2;
673 if (s1->npages < s2->npages)
675 if (s1->npages > s2->npages)
682 * Sort the memslots base on its size, so the larger slots
683 * will get better fit.
685 static void sort_memslots(struct kvm_memslots *slots)
689 sort(slots->memslots, KVM_MEM_SLOTS_NUM,
690 sizeof(struct kvm_memory_slot), cmp_memslot, NULL);
692 for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
693 slots->id_to_index[slots->memslots[i].id] = i;
696 void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new,
701 struct kvm_memory_slot *old = id_to_memslot(slots, id);
702 unsigned long npages = old->npages;
705 if (new->npages != npages)
706 sort_memslots(slots);
709 slots->generation = last_generation + 1;
712 static int check_memory_region_flags(struct kvm_userspace_memory_region *mem)
714 u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES;
716 #ifdef KVM_CAP_READONLY_MEM
717 valid_flags |= KVM_MEM_READONLY;
720 if (mem->flags & ~valid_flags)
726 static struct kvm_memslots *install_new_memslots(struct kvm *kvm,
727 struct kvm_memslots *slots, struct kvm_memory_slot *new)
729 struct kvm_memslots *old_memslots = kvm->memslots;
731 update_memslots(slots, new, kvm->memslots->generation);
732 rcu_assign_pointer(kvm->memslots, slots);
733 synchronize_srcu_expedited(&kvm->srcu);
738 * Allocate some memory and give it an address in the guest physical address
741 * Discontiguous memory is allowed, mostly for framebuffers.
743 * Must be called holding mmap_sem for write.
745 int __kvm_set_memory_region(struct kvm *kvm,
746 struct kvm_userspace_memory_region *mem)
750 unsigned long npages;
751 struct kvm_memory_slot *slot;
752 struct kvm_memory_slot old, new;
753 struct kvm_memslots *slots = NULL, *old_memslots;
754 enum kvm_mr_change change;
756 r = check_memory_region_flags(mem);
761 /* General sanity checks */
762 if (mem->memory_size & (PAGE_SIZE - 1))
764 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
766 /* We can read the guest memory with __xxx_user() later on. */
767 if ((mem->slot < KVM_USER_MEM_SLOTS) &&
768 ((mem->userspace_addr & (PAGE_SIZE - 1)) ||
769 !access_ok(VERIFY_WRITE,
770 (void __user *)(unsigned long)mem->userspace_addr,
773 if (mem->slot >= KVM_MEM_SLOTS_NUM)
775 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
778 slot = id_to_memslot(kvm->memslots, mem->slot);
779 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
780 npages = mem->memory_size >> PAGE_SHIFT;
783 if (npages > KVM_MEM_MAX_NR_PAGES)
787 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
792 new.base_gfn = base_gfn;
794 new.flags = mem->flags;
799 change = KVM_MR_CREATE;
800 else { /* Modify an existing slot. */
801 if ((mem->userspace_addr != old.userspace_addr) ||
802 (npages != old.npages) ||
803 ((new.flags ^ old.flags) & KVM_MEM_READONLY))
806 if (base_gfn != old.base_gfn)
807 change = KVM_MR_MOVE;
808 else if (new.flags != old.flags)
809 change = KVM_MR_FLAGS_ONLY;
810 else { /* Nothing to change. */
815 } else if (old.npages) {
816 change = KVM_MR_DELETE;
817 } else /* Modify a non-existent slot: disallowed. */
820 if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
821 /* Check for overlaps */
823 kvm_for_each_memslot(slot, kvm->memslots) {
824 if ((slot->id >= KVM_USER_MEM_SLOTS) ||
825 (slot->id == mem->slot))
827 if (!((base_gfn + npages <= slot->base_gfn) ||
828 (base_gfn >= slot->base_gfn + slot->npages)))
833 /* Free page dirty bitmap if unneeded */
834 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
835 new.dirty_bitmap = NULL;
838 if (change == KVM_MR_CREATE) {
839 new.userspace_addr = mem->userspace_addr;
841 if (kvm_arch_create_memslot(&new, npages))
845 /* Allocate page dirty bitmap if needed */
846 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
847 if (kvm_create_dirty_bitmap(&new) < 0)
851 if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) {
853 slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots),
857 slot = id_to_memslot(slots, mem->slot);
858 slot->flags |= KVM_MEMSLOT_INVALID;
860 old_memslots = install_new_memslots(kvm, slots, NULL);
862 /* slot was deleted or moved, clear iommu mapping */
863 kvm_iommu_unmap_pages(kvm, &old);
864 /* From this point no new shadow pages pointing to a deleted,
865 * or moved, memslot will be created.
867 * validation of sp->gfn happens in:
868 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
869 * - kvm_is_visible_gfn (mmu_check_roots)
871 kvm_arch_flush_shadow_memslot(kvm, slot);
872 slots = old_memslots;
875 r = kvm_arch_prepare_memory_region(kvm, &new, mem, change);
881 * We can re-use the old_memslots from above, the only difference
882 * from the currently installed memslots is the invalid flag. This
883 * will get overwritten by update_memslots anyway.
886 slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots),
893 * IOMMU mapping: New slots need to be mapped. Old slots need to be
894 * un-mapped and re-mapped if their base changes. Since base change
895 * unmapping is handled above with slot deletion, mapping alone is
896 * needed here. Anything else the iommu might care about for existing
897 * slots (size changes, userspace addr changes and read-only flag
898 * changes) is disallowed above, so any other attribute changes getting
899 * here can be skipped.
901 if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
902 r = kvm_iommu_map_pages(kvm, &new);
907 /* actual memory is freed via old in kvm_free_physmem_slot below */
908 if (change == KVM_MR_DELETE) {
909 new.dirty_bitmap = NULL;
910 memset(&new.arch, 0, sizeof(new.arch));
913 old_memslots = install_new_memslots(kvm, slots, &new);
915 kvm_arch_commit_memory_region(kvm, mem, &old, change);
917 kvm_free_physmem_slot(&old, &new);
925 kvm_free_physmem_slot(&new, &old);
929 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
931 int kvm_set_memory_region(struct kvm *kvm,
932 struct kvm_userspace_memory_region *mem)
936 mutex_lock(&kvm->slots_lock);
937 r = __kvm_set_memory_region(kvm, mem);
938 mutex_unlock(&kvm->slots_lock);
941 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
943 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
944 struct kvm_userspace_memory_region *mem)
946 if (mem->slot >= KVM_USER_MEM_SLOTS)
948 return kvm_set_memory_region(kvm, mem);
951 int kvm_get_dirty_log(struct kvm *kvm,
952 struct kvm_dirty_log *log, int *is_dirty)
954 struct kvm_memory_slot *memslot;
957 unsigned long any = 0;
960 if (log->slot >= KVM_USER_MEM_SLOTS)
963 memslot = id_to_memslot(kvm->memslots, log->slot);
965 if (!memslot->dirty_bitmap)
968 n = kvm_dirty_bitmap_bytes(memslot);
970 for (i = 0; !any && i < n/sizeof(long); ++i)
971 any = memslot->dirty_bitmap[i];
974 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
985 bool kvm_largepages_enabled(void)
987 return largepages_enabled;
990 void kvm_disable_largepages(void)
992 largepages_enabled = false;
994 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
996 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
998 return __gfn_to_memslot(kvm_memslots(kvm), gfn);
1000 EXPORT_SYMBOL_GPL(gfn_to_memslot);
1002 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
1004 struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn);
1006 if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS ||
1007 memslot->flags & KVM_MEMSLOT_INVALID)
1012 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
1014 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
1016 struct vm_area_struct *vma;
1017 unsigned long addr, size;
1021 addr = gfn_to_hva(kvm, gfn);
1022 if (kvm_is_error_hva(addr))
1025 down_read(¤t->mm->mmap_sem);
1026 vma = find_vma(current->mm, addr);
1030 size = vma_kernel_pagesize(vma);
1033 up_read(¤t->mm->mmap_sem);
1038 static bool memslot_is_readonly(struct kvm_memory_slot *slot)
1040 return slot->flags & KVM_MEM_READONLY;
1043 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1044 gfn_t *nr_pages, bool write)
1046 if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
1047 return KVM_HVA_ERR_BAD;
1049 if (memslot_is_readonly(slot) && write)
1050 return KVM_HVA_ERR_RO_BAD;
1053 *nr_pages = slot->npages - (gfn - slot->base_gfn);
1055 return __gfn_to_hva_memslot(slot, gfn);
1058 static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1061 return __gfn_to_hva_many(slot, gfn, nr_pages, true);
1064 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot,
1067 return gfn_to_hva_many(slot, gfn, NULL);
1069 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot);
1071 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1073 return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
1075 EXPORT_SYMBOL_GPL(gfn_to_hva);
1078 * The hva returned by this function is only allowed to be read.
1079 * It should pair with kvm_read_hva() or kvm_read_hva_atomic().
1081 static unsigned long gfn_to_hva_read(struct kvm *kvm, gfn_t gfn)
1083 return __gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL, false);
1086 static int kvm_read_hva(void *data, void __user *hva, int len)
1088 return __copy_from_user(data, hva, len);
1091 static int kvm_read_hva_atomic(void *data, void __user *hva, int len)
1093 return __copy_from_user_inatomic(data, hva, len);
1096 static int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm,
1097 unsigned long start, int write, struct page **page)
1099 int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET;
1102 flags |= FOLL_WRITE;
1104 return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL);
1107 static inline int check_user_page_hwpoison(unsigned long addr)
1109 int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE;
1111 rc = __get_user_pages(current, current->mm, addr, 1,
1112 flags, NULL, NULL, NULL);
1113 return rc == -EHWPOISON;
1117 * The atomic path to get the writable pfn which will be stored in @pfn,
1118 * true indicates success, otherwise false is returned.
1120 static bool hva_to_pfn_fast(unsigned long addr, bool atomic, bool *async,
1121 bool write_fault, bool *writable, pfn_t *pfn)
1123 struct page *page[1];
1126 if (!(async || atomic))
1130 * Fast pin a writable pfn only if it is a write fault request
1131 * or the caller allows to map a writable pfn for a read fault
1134 if (!(write_fault || writable))
1137 npages = __get_user_pages_fast(addr, 1, 1, page);
1139 *pfn = page_to_pfn(page[0]);
1150 * The slow path to get the pfn of the specified host virtual address,
1151 * 1 indicates success, -errno is returned if error is detected.
1153 static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault,
1154 bool *writable, pfn_t *pfn)
1156 struct page *page[1];
1162 *writable = write_fault;
1165 down_read(¤t->mm->mmap_sem);
1166 npages = get_user_page_nowait(current, current->mm,
1167 addr, write_fault, page);
1168 up_read(¤t->mm->mmap_sem);
1170 npages = get_user_pages_fast(addr, 1, write_fault,
1175 /* map read fault as writable if possible */
1176 if (unlikely(!write_fault) && writable) {
1177 struct page *wpage[1];
1179 npages = __get_user_pages_fast(addr, 1, 1, wpage);
1188 *pfn = page_to_pfn(page[0]);
1192 static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault)
1194 if (unlikely(!(vma->vm_flags & VM_READ)))
1197 if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE))))
1204 * Pin guest page in memory and return its pfn.
1205 * @addr: host virtual address which maps memory to the guest
1206 * @atomic: whether this function can sleep
1207 * @async: whether this function need to wait IO complete if the
1208 * host page is not in the memory
1209 * @write_fault: whether we should get a writable host page
1210 * @writable: whether it allows to map a writable host page for !@write_fault
1212 * The function will map a writable host page for these two cases:
1213 * 1): @write_fault = true
1214 * 2): @write_fault = false && @writable, @writable will tell the caller
1215 * whether the mapping is writable.
1217 static pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async,
1218 bool write_fault, bool *writable)
1220 struct vm_area_struct *vma;
1224 /* we can do it either atomically or asynchronously, not both */
1225 BUG_ON(atomic && async);
1227 if (hva_to_pfn_fast(addr, atomic, async, write_fault, writable, &pfn))
1231 return KVM_PFN_ERR_FAULT;
1233 npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn);
1237 down_read(¤t->mm->mmap_sem);
1238 if (npages == -EHWPOISON ||
1239 (!async && check_user_page_hwpoison(addr))) {
1240 pfn = KVM_PFN_ERR_HWPOISON;
1244 vma = find_vma_intersection(current->mm, addr, addr + 1);
1247 pfn = KVM_PFN_ERR_FAULT;
1248 else if ((vma->vm_flags & VM_PFNMAP)) {
1249 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) +
1251 BUG_ON(!kvm_is_mmio_pfn(pfn));
1253 if (async && vma_is_valid(vma, write_fault))
1255 pfn = KVM_PFN_ERR_FAULT;
1258 up_read(¤t->mm->mmap_sem);
1263 __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn, bool atomic,
1264 bool *async, bool write_fault, bool *writable)
1266 unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault);
1268 if (addr == KVM_HVA_ERR_RO_BAD)
1269 return KVM_PFN_ERR_RO_FAULT;
1271 if (kvm_is_error_hva(addr))
1272 return KVM_PFN_NOSLOT;
1274 /* Do not map writable pfn in the readonly memslot. */
1275 if (writable && memslot_is_readonly(slot)) {
1280 return hva_to_pfn(addr, atomic, async, write_fault,
1284 static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async,
1285 bool write_fault, bool *writable)
1287 struct kvm_memory_slot *slot;
1292 slot = gfn_to_memslot(kvm, gfn);
1294 return __gfn_to_pfn_memslot(slot, gfn, atomic, async, write_fault,
1298 pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
1300 return __gfn_to_pfn(kvm, gfn, true, NULL, true, NULL);
1302 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
1304 pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async,
1305 bool write_fault, bool *writable)
1307 return __gfn_to_pfn(kvm, gfn, false, async, write_fault, writable);
1309 EXPORT_SYMBOL_GPL(gfn_to_pfn_async);
1311 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1313 return __gfn_to_pfn(kvm, gfn, false, NULL, true, NULL);
1315 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1317 pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1320 return __gfn_to_pfn(kvm, gfn, false, NULL, write_fault, writable);
1322 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
1324 pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
1326 return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL);
1329 pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn)
1331 return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL);
1333 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic);
1335 int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
1341 addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry);
1342 if (kvm_is_error_hva(addr))
1345 if (entry < nr_pages)
1348 return __get_user_pages_fast(addr, nr_pages, 1, pages);
1350 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
1352 static struct page *kvm_pfn_to_page(pfn_t pfn)
1354 if (is_error_noslot_pfn(pfn))
1355 return KVM_ERR_PTR_BAD_PAGE;
1357 if (kvm_is_mmio_pfn(pfn)) {
1359 return KVM_ERR_PTR_BAD_PAGE;
1362 return pfn_to_page(pfn);
1365 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1369 pfn = gfn_to_pfn(kvm, gfn);
1371 return kvm_pfn_to_page(pfn);
1374 EXPORT_SYMBOL_GPL(gfn_to_page);
1376 void kvm_release_page_clean(struct page *page)
1378 WARN_ON(is_error_page(page));
1380 kvm_release_pfn_clean(page_to_pfn(page));
1382 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1384 void kvm_release_pfn_clean(pfn_t pfn)
1386 if (!is_error_noslot_pfn(pfn) && !kvm_is_mmio_pfn(pfn))
1387 put_page(pfn_to_page(pfn));
1389 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1391 void kvm_release_page_dirty(struct page *page)
1393 WARN_ON(is_error_page(page));
1395 kvm_release_pfn_dirty(page_to_pfn(page));
1397 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1399 void kvm_release_pfn_dirty(pfn_t pfn)
1401 kvm_set_pfn_dirty(pfn);
1402 kvm_release_pfn_clean(pfn);
1404 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1406 void kvm_set_page_dirty(struct page *page)
1408 kvm_set_pfn_dirty(page_to_pfn(page));
1410 EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
1412 void kvm_set_pfn_dirty(pfn_t pfn)
1414 if (!kvm_is_mmio_pfn(pfn)) {
1415 struct page *page = pfn_to_page(pfn);
1416 if (!PageReserved(page))
1420 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1422 void kvm_set_pfn_accessed(pfn_t pfn)
1424 if (!kvm_is_mmio_pfn(pfn))
1425 mark_page_accessed(pfn_to_page(pfn));
1427 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1429 void kvm_get_pfn(pfn_t pfn)
1431 if (!kvm_is_mmio_pfn(pfn))
1432 get_page(pfn_to_page(pfn));
1434 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1436 static int next_segment(unsigned long len, int offset)
1438 if (len > PAGE_SIZE - offset)
1439 return PAGE_SIZE - offset;
1444 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1450 addr = gfn_to_hva_read(kvm, gfn);
1451 if (kvm_is_error_hva(addr))
1453 r = kvm_read_hva(data, (void __user *)addr + offset, len);
1458 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1460 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1462 gfn_t gfn = gpa >> PAGE_SHIFT;
1464 int offset = offset_in_page(gpa);
1467 while ((seg = next_segment(len, offset)) != 0) {
1468 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1478 EXPORT_SYMBOL_GPL(kvm_read_guest);
1480 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1485 gfn_t gfn = gpa >> PAGE_SHIFT;
1486 int offset = offset_in_page(gpa);
1488 addr = gfn_to_hva_read(kvm, gfn);
1489 if (kvm_is_error_hva(addr))
1491 pagefault_disable();
1492 r = kvm_read_hva_atomic(data, (void __user *)addr + offset, len);
1498 EXPORT_SYMBOL(kvm_read_guest_atomic);
1500 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1501 int offset, int len)
1506 addr = gfn_to_hva(kvm, gfn);
1507 if (kvm_is_error_hva(addr))
1509 r = __copy_to_user((void __user *)addr + offset, data, len);
1512 mark_page_dirty(kvm, gfn);
1515 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1517 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1520 gfn_t gfn = gpa >> PAGE_SHIFT;
1522 int offset = offset_in_page(gpa);
1525 while ((seg = next_segment(len, offset)) != 0) {
1526 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1537 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1540 struct kvm_memslots *slots = kvm_memslots(kvm);
1541 int offset = offset_in_page(gpa);
1542 gfn_t gfn = gpa >> PAGE_SHIFT;
1545 ghc->generation = slots->generation;
1546 ghc->memslot = gfn_to_memslot(kvm, gfn);
1547 ghc->hva = gfn_to_hva_many(ghc->memslot, gfn, NULL);
1548 if (!kvm_is_error_hva(ghc->hva))
1555 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
1557 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1558 void *data, unsigned long len)
1560 struct kvm_memslots *slots = kvm_memslots(kvm);
1563 if (slots->generation != ghc->generation)
1564 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
1566 if (kvm_is_error_hva(ghc->hva))
1569 r = __copy_to_user((void __user *)ghc->hva, data, len);
1572 mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT);
1576 EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
1578 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1579 void *data, unsigned long len)
1581 struct kvm_memslots *slots = kvm_memslots(kvm);
1584 if (slots->generation != ghc->generation)
1585 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
1587 if (kvm_is_error_hva(ghc->hva))
1590 r = __copy_from_user(data, (void __user *)ghc->hva, len);
1596 EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
1598 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1600 return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page,
1603 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1605 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1607 gfn_t gfn = gpa >> PAGE_SHIFT;
1609 int offset = offset_in_page(gpa);
1612 while ((seg = next_segment(len, offset)) != 0) {
1613 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1622 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1624 void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot,
1627 if (memslot && memslot->dirty_bitmap) {
1628 unsigned long rel_gfn = gfn - memslot->base_gfn;
1630 set_bit_le(rel_gfn, memslot->dirty_bitmap);
1634 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1636 struct kvm_memory_slot *memslot;
1638 memslot = gfn_to_memslot(kvm, gfn);
1639 mark_page_dirty_in_slot(kvm, memslot, gfn);
1643 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1645 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1650 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1652 if (kvm_arch_vcpu_runnable(vcpu)) {
1653 kvm_make_request(KVM_REQ_UNHALT, vcpu);
1656 if (kvm_cpu_has_pending_timer(vcpu))
1658 if (signal_pending(current))
1664 finish_wait(&vcpu->wq, &wait);
1669 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
1671 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
1674 int cpu = vcpu->cpu;
1675 wait_queue_head_t *wqp;
1677 wqp = kvm_arch_vcpu_wq(vcpu);
1678 if (waitqueue_active(wqp)) {
1679 wake_up_interruptible(wqp);
1680 ++vcpu->stat.halt_wakeup;
1684 if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
1685 if (kvm_arch_vcpu_should_kick(vcpu))
1686 smp_send_reschedule(cpu);
1689 EXPORT_SYMBOL_GPL(kvm_vcpu_kick);
1690 #endif /* !CONFIG_S390 */
1692 void kvm_resched(struct kvm_vcpu *vcpu)
1694 if (!need_resched())
1698 EXPORT_SYMBOL_GPL(kvm_resched);
1700 bool kvm_vcpu_yield_to(struct kvm_vcpu *target)
1703 struct task_struct *task = NULL;
1707 pid = rcu_dereference(target->pid);
1709 task = get_pid_task(target->pid, PIDTYPE_PID);
1713 if (task->flags & PF_VCPU) {
1714 put_task_struct(task);
1717 ret = yield_to(task, 1);
1718 put_task_struct(task);
1722 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to);
1724 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
1726 * Helper that checks whether a VCPU is eligible for directed yield.
1727 * Most eligible candidate to yield is decided by following heuristics:
1729 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
1730 * (preempted lock holder), indicated by @in_spin_loop.
1731 * Set at the beiginning and cleared at the end of interception/PLE handler.
1733 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
1734 * chance last time (mostly it has become eligible now since we have probably
1735 * yielded to lockholder in last iteration. This is done by toggling
1736 * @dy_eligible each time a VCPU checked for eligibility.)
1738 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
1739 * to preempted lock-holder could result in wrong VCPU selection and CPU
1740 * burning. Giving priority for a potential lock-holder increases lock
1743 * Since algorithm is based on heuristics, accessing another VCPU data without
1744 * locking does not harm. It may result in trying to yield to same VCPU, fail
1745 * and continue with next VCPU and so on.
1747 bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu)
1751 eligible = !vcpu->spin_loop.in_spin_loop ||
1752 (vcpu->spin_loop.in_spin_loop &&
1753 vcpu->spin_loop.dy_eligible);
1755 if (vcpu->spin_loop.in_spin_loop)
1756 kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible);
1762 void kvm_vcpu_on_spin(struct kvm_vcpu *me)
1764 struct kvm *kvm = me->kvm;
1765 struct kvm_vcpu *vcpu;
1766 int last_boosted_vcpu = me->kvm->last_boosted_vcpu;
1772 kvm_vcpu_set_in_spin_loop(me, true);
1774 * We boost the priority of a VCPU that is runnable but not
1775 * currently running, because it got preempted by something
1776 * else and called schedule in __vcpu_run. Hopefully that
1777 * VCPU is holding the lock that we need and will release it.
1778 * We approximate round-robin by starting at the last boosted VCPU.
1780 for (pass = 0; pass < 2 && !yielded && try; pass++) {
1781 kvm_for_each_vcpu(i, vcpu, kvm) {
1782 if (!pass && i <= last_boosted_vcpu) {
1783 i = last_boosted_vcpu;
1785 } else if (pass && i > last_boosted_vcpu)
1787 if (!ACCESS_ONCE(vcpu->preempted))
1791 if (waitqueue_active(&vcpu->wq))
1793 if (!kvm_vcpu_eligible_for_directed_yield(vcpu))
1796 yielded = kvm_vcpu_yield_to(vcpu);
1798 kvm->last_boosted_vcpu = i;
1800 } else if (yielded < 0) {
1807 kvm_vcpu_set_in_spin_loop(me, false);
1809 /* Ensure vcpu is not eligible during next spinloop */
1810 kvm_vcpu_set_dy_eligible(me, false);
1812 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
1814 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1816 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1819 if (vmf->pgoff == 0)
1820 page = virt_to_page(vcpu->run);
1822 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
1823 page = virt_to_page(vcpu->arch.pio_data);
1825 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1826 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1827 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1830 return kvm_arch_vcpu_fault(vcpu, vmf);
1836 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
1837 .fault = kvm_vcpu_fault,
1840 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1842 vma->vm_ops = &kvm_vcpu_vm_ops;
1846 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1848 struct kvm_vcpu *vcpu = filp->private_data;
1850 kvm_put_kvm(vcpu->kvm);
1854 static struct file_operations kvm_vcpu_fops = {
1855 .release = kvm_vcpu_release,
1856 .unlocked_ioctl = kvm_vcpu_ioctl,
1857 #ifdef CONFIG_COMPAT
1858 .compat_ioctl = kvm_vcpu_compat_ioctl,
1860 .mmap = kvm_vcpu_mmap,
1861 .llseek = noop_llseek,
1865 * Allocates an inode for the vcpu.
1867 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1869 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR);
1873 * Creates some virtual cpus. Good luck creating more than one.
1875 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
1878 struct kvm_vcpu *vcpu, *v;
1880 vcpu = kvm_arch_vcpu_create(kvm, id);
1882 return PTR_ERR(vcpu);
1884 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1886 r = kvm_arch_vcpu_setup(vcpu);
1890 mutex_lock(&kvm->lock);
1891 if (!kvm_vcpu_compatible(vcpu)) {
1893 goto unlock_vcpu_destroy;
1895 if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
1897 goto unlock_vcpu_destroy;
1900 kvm_for_each_vcpu(r, v, kvm)
1901 if (v->vcpu_id == id) {
1903 goto unlock_vcpu_destroy;
1906 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
1908 /* Now it's all set up, let userspace reach it */
1910 r = create_vcpu_fd(vcpu);
1913 goto unlock_vcpu_destroy;
1916 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
1918 atomic_inc(&kvm->online_vcpus);
1920 mutex_unlock(&kvm->lock);
1921 kvm_arch_vcpu_postcreate(vcpu);
1924 unlock_vcpu_destroy:
1925 mutex_unlock(&kvm->lock);
1927 kvm_arch_vcpu_destroy(vcpu);
1931 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1934 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1935 vcpu->sigset_active = 1;
1936 vcpu->sigset = *sigset;
1938 vcpu->sigset_active = 0;
1942 static long kvm_vcpu_ioctl(struct file *filp,
1943 unsigned int ioctl, unsigned long arg)
1945 struct kvm_vcpu *vcpu = filp->private_data;
1946 void __user *argp = (void __user *)arg;
1948 struct kvm_fpu *fpu = NULL;
1949 struct kvm_sregs *kvm_sregs = NULL;
1951 if (vcpu->kvm->mm != current->mm)
1954 #if defined(CONFIG_S390) || defined(CONFIG_PPC)
1956 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1957 * so vcpu_load() would break it.
1959 if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT)
1960 return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1964 r = vcpu_load(vcpu);
1972 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
1973 trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
1975 case KVM_GET_REGS: {
1976 struct kvm_regs *kvm_regs;
1979 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1982 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
1986 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1993 case KVM_SET_REGS: {
1994 struct kvm_regs *kvm_regs;
1997 kvm_regs = memdup_user(argp, sizeof(*kvm_regs));
1998 if (IS_ERR(kvm_regs)) {
1999 r = PTR_ERR(kvm_regs);
2002 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
2006 case KVM_GET_SREGS: {
2007 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
2011 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
2015 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
2020 case KVM_SET_SREGS: {
2021 kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs));
2022 if (IS_ERR(kvm_sregs)) {
2023 r = PTR_ERR(kvm_sregs);
2027 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
2030 case KVM_GET_MP_STATE: {
2031 struct kvm_mp_state mp_state;
2033 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
2037 if (copy_to_user(argp, &mp_state, sizeof mp_state))
2042 case KVM_SET_MP_STATE: {
2043 struct kvm_mp_state mp_state;
2046 if (copy_from_user(&mp_state, argp, sizeof mp_state))
2048 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
2051 case KVM_TRANSLATE: {
2052 struct kvm_translation tr;
2055 if (copy_from_user(&tr, argp, sizeof tr))
2057 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
2061 if (copy_to_user(argp, &tr, sizeof tr))
2066 case KVM_SET_GUEST_DEBUG: {
2067 struct kvm_guest_debug dbg;
2070 if (copy_from_user(&dbg, argp, sizeof dbg))
2072 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
2075 case KVM_SET_SIGNAL_MASK: {
2076 struct kvm_signal_mask __user *sigmask_arg = argp;
2077 struct kvm_signal_mask kvm_sigmask;
2078 sigset_t sigset, *p;
2083 if (copy_from_user(&kvm_sigmask, argp,
2084 sizeof kvm_sigmask))
2087 if (kvm_sigmask.len != sizeof sigset)
2090 if (copy_from_user(&sigset, sigmask_arg->sigset,
2095 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
2099 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
2103 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
2107 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
2113 fpu = memdup_user(argp, sizeof(*fpu));
2119 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
2123 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
2132 #ifdef CONFIG_COMPAT
2133 static long kvm_vcpu_compat_ioctl(struct file *filp,
2134 unsigned int ioctl, unsigned long arg)
2136 struct kvm_vcpu *vcpu = filp->private_data;
2137 void __user *argp = compat_ptr(arg);
2140 if (vcpu->kvm->mm != current->mm)
2144 case KVM_SET_SIGNAL_MASK: {
2145 struct kvm_signal_mask __user *sigmask_arg = argp;
2146 struct kvm_signal_mask kvm_sigmask;
2147 compat_sigset_t csigset;
2152 if (copy_from_user(&kvm_sigmask, argp,
2153 sizeof kvm_sigmask))
2156 if (kvm_sigmask.len != sizeof csigset)
2159 if (copy_from_user(&csigset, sigmask_arg->sigset,
2162 sigset_from_compat(&sigset, &csigset);
2163 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2165 r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL);
2169 r = kvm_vcpu_ioctl(filp, ioctl, arg);
2177 static int kvm_device_ioctl_attr(struct kvm_device *dev,
2178 int (*accessor)(struct kvm_device *dev,
2179 struct kvm_device_attr *attr),
2182 struct kvm_device_attr attr;
2187 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
2190 return accessor(dev, &attr);
2193 static long kvm_device_ioctl(struct file *filp, unsigned int ioctl,
2196 struct kvm_device *dev = filp->private_data;
2199 case KVM_SET_DEVICE_ATTR:
2200 return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg);
2201 case KVM_GET_DEVICE_ATTR:
2202 return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg);
2203 case KVM_HAS_DEVICE_ATTR:
2204 return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg);
2206 if (dev->ops->ioctl)
2207 return dev->ops->ioctl(dev, ioctl, arg);
2213 static int kvm_device_release(struct inode *inode, struct file *filp)
2215 struct kvm_device *dev = filp->private_data;
2216 struct kvm *kvm = dev->kvm;
2222 static const struct file_operations kvm_device_fops = {
2223 .unlocked_ioctl = kvm_device_ioctl,
2224 .release = kvm_device_release,
2227 struct kvm_device *kvm_device_from_filp(struct file *filp)
2229 if (filp->f_op != &kvm_device_fops)
2232 return filp->private_data;
2235 static int kvm_ioctl_create_device(struct kvm *kvm,
2236 struct kvm_create_device *cd)
2238 struct kvm_device_ops *ops = NULL;
2239 struct kvm_device *dev;
2240 bool test = cd->flags & KVM_CREATE_DEVICE_TEST;
2244 #ifdef CONFIG_KVM_MPIC
2245 case KVM_DEV_TYPE_FSL_MPIC_20:
2246 case KVM_DEV_TYPE_FSL_MPIC_42:
2247 ops = &kvm_mpic_ops;
2250 #ifdef CONFIG_KVM_XICS
2251 case KVM_DEV_TYPE_XICS:
2252 ops = &kvm_xics_ops;
2262 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2269 ret = ops->create(dev, cd->type);
2275 ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR);
2281 list_add(&dev->vm_node, &kvm->devices);
2287 static long kvm_vm_ioctl(struct file *filp,
2288 unsigned int ioctl, unsigned long arg)
2290 struct kvm *kvm = filp->private_data;
2291 void __user *argp = (void __user *)arg;
2294 if (kvm->mm != current->mm)
2297 case KVM_CREATE_VCPU:
2298 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2300 case KVM_SET_USER_MEMORY_REGION: {
2301 struct kvm_userspace_memory_region kvm_userspace_mem;
2304 if (copy_from_user(&kvm_userspace_mem, argp,
2305 sizeof kvm_userspace_mem))
2308 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem);
2311 case KVM_GET_DIRTY_LOG: {
2312 struct kvm_dirty_log log;
2315 if (copy_from_user(&log, argp, sizeof log))
2317 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2320 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2321 case KVM_REGISTER_COALESCED_MMIO: {
2322 struct kvm_coalesced_mmio_zone zone;
2324 if (copy_from_user(&zone, argp, sizeof zone))
2326 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
2329 case KVM_UNREGISTER_COALESCED_MMIO: {
2330 struct kvm_coalesced_mmio_zone zone;
2332 if (copy_from_user(&zone, argp, sizeof zone))
2334 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
2339 struct kvm_irqfd data;
2342 if (copy_from_user(&data, argp, sizeof data))
2344 r = kvm_irqfd(kvm, &data);
2347 case KVM_IOEVENTFD: {
2348 struct kvm_ioeventfd data;
2351 if (copy_from_user(&data, argp, sizeof data))
2353 r = kvm_ioeventfd(kvm, &data);
2356 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2357 case KVM_SET_BOOT_CPU_ID:
2359 mutex_lock(&kvm->lock);
2360 if (atomic_read(&kvm->online_vcpus) != 0)
2363 kvm->bsp_vcpu_id = arg;
2364 mutex_unlock(&kvm->lock);
2367 #ifdef CONFIG_HAVE_KVM_MSI
2368 case KVM_SIGNAL_MSI: {
2372 if (copy_from_user(&msi, argp, sizeof msi))
2374 r = kvm_send_userspace_msi(kvm, &msi);
2378 #ifdef __KVM_HAVE_IRQ_LINE
2379 case KVM_IRQ_LINE_STATUS:
2380 case KVM_IRQ_LINE: {
2381 struct kvm_irq_level irq_event;
2384 if (copy_from_user(&irq_event, argp, sizeof irq_event))
2387 r = kvm_vm_ioctl_irq_line(kvm, &irq_event,
2388 ioctl == KVM_IRQ_LINE_STATUS);
2393 if (ioctl == KVM_IRQ_LINE_STATUS) {
2394 if (copy_to_user(argp, &irq_event, sizeof irq_event))
2402 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2403 case KVM_SET_GSI_ROUTING: {
2404 struct kvm_irq_routing routing;
2405 struct kvm_irq_routing __user *urouting;
2406 struct kvm_irq_routing_entry *entries;
2409 if (copy_from_user(&routing, argp, sizeof(routing)))
2412 if (routing.nr >= KVM_MAX_IRQ_ROUTES)
2417 entries = vmalloc(routing.nr * sizeof(*entries));
2422 if (copy_from_user(entries, urouting->entries,
2423 routing.nr * sizeof(*entries)))
2424 goto out_free_irq_routing;
2425 r = kvm_set_irq_routing(kvm, entries, routing.nr,
2427 out_free_irq_routing:
2431 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
2432 case KVM_CREATE_DEVICE: {
2433 struct kvm_create_device cd;
2436 if (copy_from_user(&cd, argp, sizeof(cd)))
2439 r = kvm_ioctl_create_device(kvm, &cd);
2444 if (copy_to_user(argp, &cd, sizeof(cd)))
2451 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
2453 r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
2459 #ifdef CONFIG_COMPAT
2460 struct compat_kvm_dirty_log {
2464 compat_uptr_t dirty_bitmap; /* one bit per page */
2469 static long kvm_vm_compat_ioctl(struct file *filp,
2470 unsigned int ioctl, unsigned long arg)
2472 struct kvm *kvm = filp->private_data;
2475 if (kvm->mm != current->mm)
2478 case KVM_GET_DIRTY_LOG: {
2479 struct compat_kvm_dirty_log compat_log;
2480 struct kvm_dirty_log log;
2483 if (copy_from_user(&compat_log, (void __user *)arg,
2484 sizeof(compat_log)))
2486 log.slot = compat_log.slot;
2487 log.padding1 = compat_log.padding1;
2488 log.padding2 = compat_log.padding2;
2489 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
2491 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2495 r = kvm_vm_ioctl(filp, ioctl, arg);
2503 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2505 struct page *page[1];
2508 gfn_t gfn = vmf->pgoff;
2509 struct kvm *kvm = vma->vm_file->private_data;
2511 addr = gfn_to_hva(kvm, gfn);
2512 if (kvm_is_error_hva(addr))
2513 return VM_FAULT_SIGBUS;
2515 npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
2517 if (unlikely(npages != 1))
2518 return VM_FAULT_SIGBUS;
2520 vmf->page = page[0];
2524 static const struct vm_operations_struct kvm_vm_vm_ops = {
2525 .fault = kvm_vm_fault,
2528 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2530 vma->vm_ops = &kvm_vm_vm_ops;
2534 static struct file_operations kvm_vm_fops = {
2535 .release = kvm_vm_release,
2536 .unlocked_ioctl = kvm_vm_ioctl,
2537 #ifdef CONFIG_COMPAT
2538 .compat_ioctl = kvm_vm_compat_ioctl,
2540 .mmap = kvm_vm_mmap,
2541 .llseek = noop_llseek,
2544 static int kvm_dev_ioctl_create_vm(unsigned long type)
2549 kvm = kvm_create_vm(type);
2551 return PTR_ERR(kvm);
2552 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2553 r = kvm_coalesced_mmio_init(kvm);
2559 r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
2566 static long kvm_dev_ioctl_check_extension_generic(long arg)
2569 case KVM_CAP_USER_MEMORY:
2570 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
2571 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
2572 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2573 case KVM_CAP_SET_BOOT_CPU_ID:
2575 case KVM_CAP_INTERNAL_ERROR_DATA:
2576 #ifdef CONFIG_HAVE_KVM_MSI
2577 case KVM_CAP_SIGNAL_MSI:
2579 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2580 case KVM_CAP_IRQFD_RESAMPLE:
2583 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2584 case KVM_CAP_IRQ_ROUTING:
2585 return KVM_MAX_IRQ_ROUTES;
2590 return kvm_dev_ioctl_check_extension(arg);
2593 static long kvm_dev_ioctl(struct file *filp,
2594 unsigned int ioctl, unsigned long arg)
2599 case KVM_GET_API_VERSION:
2603 r = KVM_API_VERSION;
2606 r = kvm_dev_ioctl_create_vm(arg);
2608 case KVM_CHECK_EXTENSION:
2609 r = kvm_dev_ioctl_check_extension_generic(arg);
2611 case KVM_GET_VCPU_MMAP_SIZE:
2615 r = PAGE_SIZE; /* struct kvm_run */
2617 r += PAGE_SIZE; /* pio data page */
2619 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2620 r += PAGE_SIZE; /* coalesced mmio ring page */
2623 case KVM_TRACE_ENABLE:
2624 case KVM_TRACE_PAUSE:
2625 case KVM_TRACE_DISABLE:
2629 return kvm_arch_dev_ioctl(filp, ioctl, arg);
2635 static struct file_operations kvm_chardev_ops = {
2636 .unlocked_ioctl = kvm_dev_ioctl,
2637 .compat_ioctl = kvm_dev_ioctl,
2638 .llseek = noop_llseek,
2641 static struct miscdevice kvm_dev = {
2647 static void hardware_enable_nolock(void *junk)
2649 int cpu = raw_smp_processor_id();
2652 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
2655 cpumask_set_cpu(cpu, cpus_hardware_enabled);
2657 r = kvm_arch_hardware_enable(NULL);
2660 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2661 atomic_inc(&hardware_enable_failed);
2662 printk(KERN_INFO "kvm: enabling virtualization on "
2663 "CPU%d failed\n", cpu);
2667 static void hardware_enable(void *junk)
2669 raw_spin_lock(&kvm_lock);
2670 hardware_enable_nolock(junk);
2671 raw_spin_unlock(&kvm_lock);
2674 static void hardware_disable_nolock(void *junk)
2676 int cpu = raw_smp_processor_id();
2678 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
2680 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2681 kvm_arch_hardware_disable(NULL);
2684 static void hardware_disable(void *junk)
2686 raw_spin_lock(&kvm_lock);
2687 hardware_disable_nolock(junk);
2688 raw_spin_unlock(&kvm_lock);
2691 static void hardware_disable_all_nolock(void)
2693 BUG_ON(!kvm_usage_count);
2696 if (!kvm_usage_count)
2697 on_each_cpu(hardware_disable_nolock, NULL, 1);
2700 static void hardware_disable_all(void)
2702 raw_spin_lock(&kvm_lock);
2703 hardware_disable_all_nolock();
2704 raw_spin_unlock(&kvm_lock);
2707 static int hardware_enable_all(void)
2711 raw_spin_lock(&kvm_lock);
2714 if (kvm_usage_count == 1) {
2715 atomic_set(&hardware_enable_failed, 0);
2716 on_each_cpu(hardware_enable_nolock, NULL, 1);
2718 if (atomic_read(&hardware_enable_failed)) {
2719 hardware_disable_all_nolock();
2724 raw_spin_unlock(&kvm_lock);
2729 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2734 if (!kvm_usage_count)
2737 val &= ~CPU_TASKS_FROZEN;
2740 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2742 hardware_disable(NULL);
2745 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2747 hardware_enable(NULL);
2753 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2757 * Some (well, at least mine) BIOSes hang on reboot if
2760 * And Intel TXT required VMX off for all cpu when system shutdown.
2762 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2763 kvm_rebooting = true;
2764 on_each_cpu(hardware_disable_nolock, NULL, 1);
2768 static struct notifier_block kvm_reboot_notifier = {
2769 .notifier_call = kvm_reboot,
2773 static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
2777 for (i = 0; i < bus->dev_count; i++) {
2778 struct kvm_io_device *pos = bus->range[i].dev;
2780 kvm_iodevice_destructor(pos);
2785 static int kvm_io_bus_sort_cmp(const void *p1, const void *p2)
2787 const struct kvm_io_range *r1 = p1;
2788 const struct kvm_io_range *r2 = p2;
2790 if (r1->addr < r2->addr)
2792 if (r1->addr + r1->len > r2->addr + r2->len)
2797 static int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev,
2798 gpa_t addr, int len)
2800 bus->range[bus->dev_count++] = (struct kvm_io_range) {
2806 sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range),
2807 kvm_io_bus_sort_cmp, NULL);
2812 static int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus,
2813 gpa_t addr, int len)
2815 struct kvm_io_range *range, key;
2818 key = (struct kvm_io_range) {
2823 range = bsearch(&key, bus->range, bus->dev_count,
2824 sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp);
2828 off = range - bus->range;
2830 while (off > 0 && kvm_io_bus_sort_cmp(&key, &bus->range[off-1]) == 0)
2836 /* kvm_io_bus_write - called under kvm->slots_lock */
2837 int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2838 int len, const void *val)
2841 struct kvm_io_bus *bus;
2842 struct kvm_io_range range;
2844 range = (struct kvm_io_range) {
2849 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2850 idx = kvm_io_bus_get_first_dev(bus, addr, len);
2854 while (idx < bus->dev_count &&
2855 kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) {
2856 if (!kvm_iodevice_write(bus->range[idx].dev, addr, len, val))
2864 /* kvm_io_bus_read - called under kvm->slots_lock */
2865 int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2869 struct kvm_io_bus *bus;
2870 struct kvm_io_range range;
2872 range = (struct kvm_io_range) {
2877 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2878 idx = kvm_io_bus_get_first_dev(bus, addr, len);
2882 while (idx < bus->dev_count &&
2883 kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) {
2884 if (!kvm_iodevice_read(bus->range[idx].dev, addr, len, val))
2892 /* Caller must hold slots_lock. */
2893 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2894 int len, struct kvm_io_device *dev)
2896 struct kvm_io_bus *new_bus, *bus;
2898 bus = kvm->buses[bus_idx];
2899 if (bus->dev_count > NR_IOBUS_DEVS - 1)
2902 new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count + 1) *
2903 sizeof(struct kvm_io_range)), GFP_KERNEL);
2906 memcpy(new_bus, bus, sizeof(*bus) + (bus->dev_count *
2907 sizeof(struct kvm_io_range)));
2908 kvm_io_bus_insert_dev(new_bus, dev, addr, len);
2909 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2910 synchronize_srcu_expedited(&kvm->srcu);
2916 /* Caller must hold slots_lock. */
2917 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2918 struct kvm_io_device *dev)
2921 struct kvm_io_bus *new_bus, *bus;
2923 bus = kvm->buses[bus_idx];
2925 for (i = 0; i < bus->dev_count; i++)
2926 if (bus->range[i].dev == dev) {
2934 new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count - 1) *
2935 sizeof(struct kvm_io_range)), GFP_KERNEL);
2939 memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range));
2940 new_bus->dev_count--;
2941 memcpy(new_bus->range + i, bus->range + i + 1,
2942 (new_bus->dev_count - i) * sizeof(struct kvm_io_range));
2944 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2945 synchronize_srcu_expedited(&kvm->srcu);
2950 static struct notifier_block kvm_cpu_notifier = {
2951 .notifier_call = kvm_cpu_hotplug,
2954 static int vm_stat_get(void *_offset, u64 *val)
2956 unsigned offset = (long)_offset;
2960 raw_spin_lock(&kvm_lock);
2961 list_for_each_entry(kvm, &vm_list, vm_list)
2962 *val += *(u32 *)((void *)kvm + offset);
2963 raw_spin_unlock(&kvm_lock);
2967 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
2969 static int vcpu_stat_get(void *_offset, u64 *val)
2971 unsigned offset = (long)_offset;
2973 struct kvm_vcpu *vcpu;
2977 raw_spin_lock(&kvm_lock);
2978 list_for_each_entry(kvm, &vm_list, vm_list)
2979 kvm_for_each_vcpu(i, vcpu, kvm)
2980 *val += *(u32 *)((void *)vcpu + offset);
2982 raw_spin_unlock(&kvm_lock);
2986 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
2988 static const struct file_operations *stat_fops[] = {
2989 [KVM_STAT_VCPU] = &vcpu_stat_fops,
2990 [KVM_STAT_VM] = &vm_stat_fops,
2993 static int kvm_init_debug(void)
2996 struct kvm_stats_debugfs_item *p;
2998 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
2999 if (kvm_debugfs_dir == NULL)
3002 for (p = debugfs_entries; p->name; ++p) {
3003 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
3004 (void *)(long)p->offset,
3005 stat_fops[p->kind]);
3006 if (p->dentry == NULL)
3013 debugfs_remove_recursive(kvm_debugfs_dir);
3018 static void kvm_exit_debug(void)
3020 struct kvm_stats_debugfs_item *p;
3022 for (p = debugfs_entries; p->name; ++p)
3023 debugfs_remove(p->dentry);
3024 debugfs_remove(kvm_debugfs_dir);
3027 static int kvm_suspend(void)
3029 if (kvm_usage_count)
3030 hardware_disable_nolock(NULL);
3034 static void kvm_resume(void)
3036 if (kvm_usage_count) {
3037 WARN_ON(raw_spin_is_locked(&kvm_lock));
3038 hardware_enable_nolock(NULL);
3042 static struct syscore_ops kvm_syscore_ops = {
3043 .suspend = kvm_suspend,
3044 .resume = kvm_resume,
3048 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
3050 return container_of(pn, struct kvm_vcpu, preempt_notifier);
3053 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
3055 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3056 if (vcpu->preempted)
3057 vcpu->preempted = false;
3059 kvm_arch_vcpu_load(vcpu, cpu);
3062 static void kvm_sched_out(struct preempt_notifier *pn,
3063 struct task_struct *next)
3065 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3067 if (current->state == TASK_RUNNING)
3068 vcpu->preempted = true;
3069 kvm_arch_vcpu_put(vcpu);
3072 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
3073 struct module *module)
3078 r = kvm_irqfd_init();
3081 r = kvm_arch_init(opaque);
3085 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
3090 r = kvm_arch_hardware_setup();
3094 for_each_online_cpu(cpu) {
3095 smp_call_function_single(cpu,
3096 kvm_arch_check_processor_compat,
3102 r = register_cpu_notifier(&kvm_cpu_notifier);
3105 register_reboot_notifier(&kvm_reboot_notifier);
3107 /* A kmem cache lets us meet the alignment requirements of fx_save. */
3109 vcpu_align = __alignof__(struct kvm_vcpu);
3110 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
3112 if (!kvm_vcpu_cache) {
3117 r = kvm_async_pf_init();
3121 kvm_chardev_ops.owner = module;
3122 kvm_vm_fops.owner = module;
3123 kvm_vcpu_fops.owner = module;
3125 r = misc_register(&kvm_dev);
3127 printk(KERN_ERR "kvm: misc device register failed\n");
3131 register_syscore_ops(&kvm_syscore_ops);
3133 kvm_preempt_ops.sched_in = kvm_sched_in;
3134 kvm_preempt_ops.sched_out = kvm_sched_out;
3136 r = kvm_init_debug();
3138 printk(KERN_ERR "kvm: create debugfs files failed\n");
3145 unregister_syscore_ops(&kvm_syscore_ops);
3147 kvm_async_pf_deinit();
3149 kmem_cache_destroy(kvm_vcpu_cache);
3151 unregister_reboot_notifier(&kvm_reboot_notifier);
3152 unregister_cpu_notifier(&kvm_cpu_notifier);
3155 kvm_arch_hardware_unsetup();
3157 free_cpumask_var(cpus_hardware_enabled);
3165 EXPORT_SYMBOL_GPL(kvm_init);
3170 misc_deregister(&kvm_dev);
3171 kmem_cache_destroy(kvm_vcpu_cache);
3172 kvm_async_pf_deinit();
3173 unregister_syscore_ops(&kvm_syscore_ops);
3174 unregister_reboot_notifier(&kvm_reboot_notifier);
3175 unregister_cpu_notifier(&kvm_cpu_notifier);
3176 on_each_cpu(hardware_disable_nolock, NULL, 1);
3177 kvm_arch_hardware_unsetup();
3180 free_cpumask_var(cpus_hardware_enabled);
3182 EXPORT_SYMBOL_GPL(kvm_exit);