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);
508 r = kvm_init_mmu_notifier(kvm);
512 raw_spin_lock(&kvm_lock);
513 list_add(&kvm->vm_list, &vm_list);
514 raw_spin_unlock(&kvm_lock);
519 cleanup_srcu_struct(&kvm->srcu);
521 hardware_disable_all();
523 for (i = 0; i < KVM_NR_BUSES; i++)
524 kfree(kvm->buses[i]);
525 kfree(kvm->memslots);
526 kvm_arch_free_vm(kvm);
531 * Avoid using vmalloc for a small buffer.
532 * Should not be used when the size is statically known.
534 void *kvm_kvzalloc(unsigned long size)
536 if (size > PAGE_SIZE)
537 return vzalloc(size);
539 return kzalloc(size, GFP_KERNEL);
542 void kvm_kvfree(const void *addr)
544 if (is_vmalloc_addr(addr))
550 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
552 if (!memslot->dirty_bitmap)
555 kvm_kvfree(memslot->dirty_bitmap);
556 memslot->dirty_bitmap = NULL;
560 * Free any memory in @free but not in @dont.
562 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
563 struct kvm_memory_slot *dont)
565 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
566 kvm_destroy_dirty_bitmap(free);
568 kvm_arch_free_memslot(free, dont);
573 void kvm_free_physmem(struct kvm *kvm)
575 struct kvm_memslots *slots = kvm->memslots;
576 struct kvm_memory_slot *memslot;
578 kvm_for_each_memslot(memslot, slots)
579 kvm_free_physmem_slot(memslot, NULL);
581 kfree(kvm->memslots);
584 static void kvm_destroy_vm(struct kvm *kvm)
587 struct mm_struct *mm = kvm->mm;
589 kvm_arch_sync_events(kvm);
590 raw_spin_lock(&kvm_lock);
591 list_del(&kvm->vm_list);
592 raw_spin_unlock(&kvm_lock);
593 kvm_free_irq_routing(kvm);
594 for (i = 0; i < KVM_NR_BUSES; i++)
595 kvm_io_bus_destroy(kvm->buses[i]);
596 kvm_coalesced_mmio_free(kvm);
597 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
598 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
600 kvm_arch_flush_shadow_all(kvm);
602 kvm_arch_destroy_vm(kvm);
603 kvm_free_physmem(kvm);
604 cleanup_srcu_struct(&kvm->srcu);
605 kvm_arch_free_vm(kvm);
606 hardware_disable_all();
610 void kvm_get_kvm(struct kvm *kvm)
612 atomic_inc(&kvm->users_count);
614 EXPORT_SYMBOL_GPL(kvm_get_kvm);
616 void kvm_put_kvm(struct kvm *kvm)
618 if (atomic_dec_and_test(&kvm->users_count))
621 EXPORT_SYMBOL_GPL(kvm_put_kvm);
624 static int kvm_vm_release(struct inode *inode, struct file *filp)
626 struct kvm *kvm = filp->private_data;
628 kvm_irqfd_release(kvm);
635 * Allocation size is twice as large as the actual dirty bitmap size.
636 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
638 static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
641 unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
643 memslot->dirty_bitmap = kvm_kvzalloc(dirty_bytes);
644 if (!memslot->dirty_bitmap)
647 #endif /* !CONFIG_S390 */
651 static int cmp_memslot(const void *slot1, const void *slot2)
653 struct kvm_memory_slot *s1, *s2;
655 s1 = (struct kvm_memory_slot *)slot1;
656 s2 = (struct kvm_memory_slot *)slot2;
658 if (s1->npages < s2->npages)
660 if (s1->npages > s2->npages)
667 * Sort the memslots base on its size, so the larger slots
668 * will get better fit.
670 static void sort_memslots(struct kvm_memslots *slots)
674 sort(slots->memslots, KVM_MEM_SLOTS_NUM,
675 sizeof(struct kvm_memory_slot), cmp_memslot, NULL);
677 for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
678 slots->id_to_index[slots->memslots[i].id] = i;
681 void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new,
686 struct kvm_memory_slot *old = id_to_memslot(slots, id);
687 unsigned long npages = old->npages;
690 if (new->npages != npages)
691 sort_memslots(slots);
694 slots->generation = last_generation + 1;
697 static int check_memory_region_flags(struct kvm_userspace_memory_region *mem)
699 u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES;
701 #ifdef KVM_CAP_READONLY_MEM
702 valid_flags |= KVM_MEM_READONLY;
705 if (mem->flags & ~valid_flags)
711 static struct kvm_memslots *install_new_memslots(struct kvm *kvm,
712 struct kvm_memslots *slots, struct kvm_memory_slot *new)
714 struct kvm_memslots *old_memslots = kvm->memslots;
716 update_memslots(slots, new, kvm->memslots->generation);
717 rcu_assign_pointer(kvm->memslots, slots);
718 synchronize_srcu_expedited(&kvm->srcu);
723 * Allocate some memory and give it an address in the guest physical address
726 * Discontiguous memory is allowed, mostly for framebuffers.
728 * Must be called holding mmap_sem for write.
730 int __kvm_set_memory_region(struct kvm *kvm,
731 struct kvm_userspace_memory_region *mem)
735 unsigned long npages;
736 struct kvm_memory_slot *slot;
737 struct kvm_memory_slot old, new;
738 struct kvm_memslots *slots = NULL, *old_memslots;
739 enum kvm_mr_change change;
741 r = check_memory_region_flags(mem);
746 /* General sanity checks */
747 if (mem->memory_size & (PAGE_SIZE - 1))
749 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
751 /* We can read the guest memory with __xxx_user() later on. */
752 if ((mem->slot < KVM_USER_MEM_SLOTS) &&
753 ((mem->userspace_addr & (PAGE_SIZE - 1)) ||
754 !access_ok(VERIFY_WRITE,
755 (void __user *)(unsigned long)mem->userspace_addr,
758 if (mem->slot >= KVM_MEM_SLOTS_NUM)
760 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
763 slot = id_to_memslot(kvm->memslots, mem->slot);
764 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
765 npages = mem->memory_size >> PAGE_SHIFT;
768 if (npages > KVM_MEM_MAX_NR_PAGES)
772 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
777 new.base_gfn = base_gfn;
779 new.flags = mem->flags;
784 change = KVM_MR_CREATE;
785 else { /* Modify an existing slot. */
786 if ((mem->userspace_addr != old.userspace_addr) ||
787 (npages != old.npages) ||
788 ((new.flags ^ old.flags) & KVM_MEM_READONLY))
791 if (base_gfn != old.base_gfn)
792 change = KVM_MR_MOVE;
793 else if (new.flags != old.flags)
794 change = KVM_MR_FLAGS_ONLY;
795 else { /* Nothing to change. */
800 } else if (old.npages) {
801 change = KVM_MR_DELETE;
802 } else /* Modify a non-existent slot: disallowed. */
805 if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
806 /* Check for overlaps */
808 kvm_for_each_memslot(slot, kvm->memslots) {
809 if ((slot->id >= KVM_USER_MEM_SLOTS) ||
810 (slot->id == mem->slot))
812 if (!((base_gfn + npages <= slot->base_gfn) ||
813 (base_gfn >= slot->base_gfn + slot->npages)))
818 /* Free page dirty bitmap if unneeded */
819 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
820 new.dirty_bitmap = NULL;
823 if (change == KVM_MR_CREATE) {
824 new.userspace_addr = mem->userspace_addr;
826 if (kvm_arch_create_memslot(&new, npages))
830 /* Allocate page dirty bitmap if needed */
831 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
832 if (kvm_create_dirty_bitmap(&new) < 0)
836 if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) {
838 slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots),
842 slot = id_to_memslot(slots, mem->slot);
843 slot->flags |= KVM_MEMSLOT_INVALID;
845 old_memslots = install_new_memslots(kvm, slots, NULL);
847 /* slot was deleted or moved, clear iommu mapping */
848 kvm_iommu_unmap_pages(kvm, &old);
849 /* From this point no new shadow pages pointing to a deleted,
850 * or moved, memslot will be created.
852 * validation of sp->gfn happens in:
853 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
854 * - kvm_is_visible_gfn (mmu_check_roots)
856 kvm_arch_flush_shadow_memslot(kvm, slot);
857 slots = old_memslots;
860 r = kvm_arch_prepare_memory_region(kvm, &new, mem, change);
866 * We can re-use the old_memslots from above, the only difference
867 * from the currently installed memslots is the invalid flag. This
868 * will get overwritten by update_memslots anyway.
871 slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots),
878 * IOMMU mapping: New slots need to be mapped. Old slots need to be
879 * un-mapped and re-mapped if their base changes. Since base change
880 * unmapping is handled above with slot deletion, mapping alone is
881 * needed here. Anything else the iommu might care about for existing
882 * slots (size changes, userspace addr changes and read-only flag
883 * changes) is disallowed above, so any other attribute changes getting
884 * here can be skipped.
886 if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
887 r = kvm_iommu_map_pages(kvm, &new);
892 /* actual memory is freed via old in kvm_free_physmem_slot below */
893 if (change == KVM_MR_DELETE) {
894 new.dirty_bitmap = NULL;
895 memset(&new.arch, 0, sizeof(new.arch));
898 old_memslots = install_new_memslots(kvm, slots, &new);
900 kvm_arch_commit_memory_region(kvm, mem, &old, change);
902 kvm_free_physmem_slot(&old, &new);
910 kvm_free_physmem_slot(&new, &old);
914 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
916 int kvm_set_memory_region(struct kvm *kvm,
917 struct kvm_userspace_memory_region *mem)
921 mutex_lock(&kvm->slots_lock);
922 r = __kvm_set_memory_region(kvm, mem);
923 mutex_unlock(&kvm->slots_lock);
926 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
928 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
929 struct kvm_userspace_memory_region *mem)
931 if (mem->slot >= KVM_USER_MEM_SLOTS)
933 return kvm_set_memory_region(kvm, mem);
936 int kvm_get_dirty_log(struct kvm *kvm,
937 struct kvm_dirty_log *log, int *is_dirty)
939 struct kvm_memory_slot *memslot;
942 unsigned long any = 0;
945 if (log->slot >= KVM_USER_MEM_SLOTS)
948 memslot = id_to_memslot(kvm->memslots, log->slot);
950 if (!memslot->dirty_bitmap)
953 n = kvm_dirty_bitmap_bytes(memslot);
955 for (i = 0; !any && i < n/sizeof(long); ++i)
956 any = memslot->dirty_bitmap[i];
959 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
970 bool kvm_largepages_enabled(void)
972 return largepages_enabled;
975 void kvm_disable_largepages(void)
977 largepages_enabled = false;
979 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
981 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
983 return __gfn_to_memslot(kvm_memslots(kvm), gfn);
985 EXPORT_SYMBOL_GPL(gfn_to_memslot);
987 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
989 struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn);
991 if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS ||
992 memslot->flags & KVM_MEMSLOT_INVALID)
997 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
999 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
1001 struct vm_area_struct *vma;
1002 unsigned long addr, size;
1006 addr = gfn_to_hva(kvm, gfn);
1007 if (kvm_is_error_hva(addr))
1010 down_read(¤t->mm->mmap_sem);
1011 vma = find_vma(current->mm, addr);
1015 size = vma_kernel_pagesize(vma);
1018 up_read(¤t->mm->mmap_sem);
1023 static bool memslot_is_readonly(struct kvm_memory_slot *slot)
1025 return slot->flags & KVM_MEM_READONLY;
1028 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1029 gfn_t *nr_pages, bool write)
1031 if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
1032 return KVM_HVA_ERR_BAD;
1034 if (memslot_is_readonly(slot) && write)
1035 return KVM_HVA_ERR_RO_BAD;
1038 *nr_pages = slot->npages - (gfn - slot->base_gfn);
1040 return __gfn_to_hva_memslot(slot, gfn);
1043 static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1046 return __gfn_to_hva_many(slot, gfn, nr_pages, true);
1049 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot,
1052 return gfn_to_hva_many(slot, gfn, NULL);
1054 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot);
1056 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1058 return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
1060 EXPORT_SYMBOL_GPL(gfn_to_hva);
1063 * The hva returned by this function is only allowed to be read.
1064 * It should pair with kvm_read_hva() or kvm_read_hva_atomic().
1066 static unsigned long gfn_to_hva_read(struct kvm *kvm, gfn_t gfn)
1068 return __gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL, false);
1071 static int kvm_read_hva(void *data, void __user *hva, int len)
1073 return __copy_from_user(data, hva, len);
1076 static int kvm_read_hva_atomic(void *data, void __user *hva, int len)
1078 return __copy_from_user_inatomic(data, hva, len);
1081 static int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm,
1082 unsigned long start, int write, struct page **page)
1084 int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET;
1087 flags |= FOLL_WRITE;
1089 return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL);
1092 static inline int check_user_page_hwpoison(unsigned long addr)
1094 int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE;
1096 rc = __get_user_pages(current, current->mm, addr, 1,
1097 flags, NULL, NULL, NULL);
1098 return rc == -EHWPOISON;
1102 * The atomic path to get the writable pfn which will be stored in @pfn,
1103 * true indicates success, otherwise false is returned.
1105 static bool hva_to_pfn_fast(unsigned long addr, bool atomic, bool *async,
1106 bool write_fault, bool *writable, pfn_t *pfn)
1108 struct page *page[1];
1111 if (!(async || atomic))
1115 * Fast pin a writable pfn only if it is a write fault request
1116 * or the caller allows to map a writable pfn for a read fault
1119 if (!(write_fault || writable))
1122 npages = __get_user_pages_fast(addr, 1, 1, page);
1124 *pfn = page_to_pfn(page[0]);
1135 * The slow path to get the pfn of the specified host virtual address,
1136 * 1 indicates success, -errno is returned if error is detected.
1138 static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault,
1139 bool *writable, pfn_t *pfn)
1141 struct page *page[1];
1147 *writable = write_fault;
1150 down_read(¤t->mm->mmap_sem);
1151 npages = get_user_page_nowait(current, current->mm,
1152 addr, write_fault, page);
1153 up_read(¤t->mm->mmap_sem);
1155 npages = get_user_pages_fast(addr, 1, write_fault,
1160 /* map read fault as writable if possible */
1161 if (unlikely(!write_fault) && writable) {
1162 struct page *wpage[1];
1164 npages = __get_user_pages_fast(addr, 1, 1, wpage);
1173 *pfn = page_to_pfn(page[0]);
1177 static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault)
1179 if (unlikely(!(vma->vm_flags & VM_READ)))
1182 if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE))))
1189 * Pin guest page in memory and return its pfn.
1190 * @addr: host virtual address which maps memory to the guest
1191 * @atomic: whether this function can sleep
1192 * @async: whether this function need to wait IO complete if the
1193 * host page is not in the memory
1194 * @write_fault: whether we should get a writable host page
1195 * @writable: whether it allows to map a writable host page for !@write_fault
1197 * The function will map a writable host page for these two cases:
1198 * 1): @write_fault = true
1199 * 2): @write_fault = false && @writable, @writable will tell the caller
1200 * whether the mapping is writable.
1202 static pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async,
1203 bool write_fault, bool *writable)
1205 struct vm_area_struct *vma;
1209 /* we can do it either atomically or asynchronously, not both */
1210 BUG_ON(atomic && async);
1212 if (hva_to_pfn_fast(addr, atomic, async, write_fault, writable, &pfn))
1216 return KVM_PFN_ERR_FAULT;
1218 npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn);
1222 down_read(¤t->mm->mmap_sem);
1223 if (npages == -EHWPOISON ||
1224 (!async && check_user_page_hwpoison(addr))) {
1225 pfn = KVM_PFN_ERR_HWPOISON;
1229 vma = find_vma_intersection(current->mm, addr, addr + 1);
1232 pfn = KVM_PFN_ERR_FAULT;
1233 else if ((vma->vm_flags & VM_PFNMAP)) {
1234 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) +
1236 BUG_ON(!kvm_is_mmio_pfn(pfn));
1238 if (async && vma_is_valid(vma, write_fault))
1240 pfn = KVM_PFN_ERR_FAULT;
1243 up_read(¤t->mm->mmap_sem);
1248 __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn, bool atomic,
1249 bool *async, bool write_fault, bool *writable)
1251 unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault);
1253 if (addr == KVM_HVA_ERR_RO_BAD)
1254 return KVM_PFN_ERR_RO_FAULT;
1256 if (kvm_is_error_hva(addr))
1257 return KVM_PFN_NOSLOT;
1259 /* Do not map writable pfn in the readonly memslot. */
1260 if (writable && memslot_is_readonly(slot)) {
1265 return hva_to_pfn(addr, atomic, async, write_fault,
1269 static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async,
1270 bool write_fault, bool *writable)
1272 struct kvm_memory_slot *slot;
1277 slot = gfn_to_memslot(kvm, gfn);
1279 return __gfn_to_pfn_memslot(slot, gfn, atomic, async, write_fault,
1283 pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
1285 return __gfn_to_pfn(kvm, gfn, true, NULL, true, NULL);
1287 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
1289 pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async,
1290 bool write_fault, bool *writable)
1292 return __gfn_to_pfn(kvm, gfn, false, async, write_fault, writable);
1294 EXPORT_SYMBOL_GPL(gfn_to_pfn_async);
1296 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1298 return __gfn_to_pfn(kvm, gfn, false, NULL, true, NULL);
1300 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1302 pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1305 return __gfn_to_pfn(kvm, gfn, false, NULL, write_fault, writable);
1307 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
1309 pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
1311 return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL);
1314 pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn)
1316 return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL);
1318 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic);
1320 int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
1326 addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry);
1327 if (kvm_is_error_hva(addr))
1330 if (entry < nr_pages)
1333 return __get_user_pages_fast(addr, nr_pages, 1, pages);
1335 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
1337 static struct page *kvm_pfn_to_page(pfn_t pfn)
1339 if (is_error_noslot_pfn(pfn))
1340 return KVM_ERR_PTR_BAD_PAGE;
1342 if (kvm_is_mmio_pfn(pfn)) {
1344 return KVM_ERR_PTR_BAD_PAGE;
1347 return pfn_to_page(pfn);
1350 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1354 pfn = gfn_to_pfn(kvm, gfn);
1356 return kvm_pfn_to_page(pfn);
1359 EXPORT_SYMBOL_GPL(gfn_to_page);
1361 void kvm_release_page_clean(struct page *page)
1363 WARN_ON(is_error_page(page));
1365 kvm_release_pfn_clean(page_to_pfn(page));
1367 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1369 void kvm_release_pfn_clean(pfn_t pfn)
1371 if (!is_error_noslot_pfn(pfn) && !kvm_is_mmio_pfn(pfn))
1372 put_page(pfn_to_page(pfn));
1374 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1376 void kvm_release_page_dirty(struct page *page)
1378 WARN_ON(is_error_page(page));
1380 kvm_release_pfn_dirty(page_to_pfn(page));
1382 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1384 void kvm_release_pfn_dirty(pfn_t pfn)
1386 kvm_set_pfn_dirty(pfn);
1387 kvm_release_pfn_clean(pfn);
1389 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1391 void kvm_set_page_dirty(struct page *page)
1393 kvm_set_pfn_dirty(page_to_pfn(page));
1395 EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
1397 void kvm_set_pfn_dirty(pfn_t pfn)
1399 if (!kvm_is_mmio_pfn(pfn)) {
1400 struct page *page = pfn_to_page(pfn);
1401 if (!PageReserved(page))
1405 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1407 void kvm_set_pfn_accessed(pfn_t pfn)
1409 if (!kvm_is_mmio_pfn(pfn))
1410 mark_page_accessed(pfn_to_page(pfn));
1412 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1414 void kvm_get_pfn(pfn_t pfn)
1416 if (!kvm_is_mmio_pfn(pfn))
1417 get_page(pfn_to_page(pfn));
1419 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1421 static int next_segment(unsigned long len, int offset)
1423 if (len > PAGE_SIZE - offset)
1424 return PAGE_SIZE - offset;
1429 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1435 addr = gfn_to_hva_read(kvm, gfn);
1436 if (kvm_is_error_hva(addr))
1438 r = kvm_read_hva(data, (void __user *)addr + offset, len);
1443 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1445 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1447 gfn_t gfn = gpa >> PAGE_SHIFT;
1449 int offset = offset_in_page(gpa);
1452 while ((seg = next_segment(len, offset)) != 0) {
1453 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1463 EXPORT_SYMBOL_GPL(kvm_read_guest);
1465 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1470 gfn_t gfn = gpa >> PAGE_SHIFT;
1471 int offset = offset_in_page(gpa);
1473 addr = gfn_to_hva_read(kvm, gfn);
1474 if (kvm_is_error_hva(addr))
1476 pagefault_disable();
1477 r = kvm_read_hva_atomic(data, (void __user *)addr + offset, len);
1483 EXPORT_SYMBOL(kvm_read_guest_atomic);
1485 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1486 int offset, int len)
1491 addr = gfn_to_hva(kvm, gfn);
1492 if (kvm_is_error_hva(addr))
1494 r = __copy_to_user((void __user *)addr + offset, data, len);
1497 mark_page_dirty(kvm, gfn);
1500 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1502 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1505 gfn_t gfn = gpa >> PAGE_SHIFT;
1507 int offset = offset_in_page(gpa);
1510 while ((seg = next_segment(len, offset)) != 0) {
1511 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1522 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1525 struct kvm_memslots *slots = kvm_memslots(kvm);
1526 int offset = offset_in_page(gpa);
1527 gfn_t gfn = gpa >> PAGE_SHIFT;
1530 ghc->generation = slots->generation;
1531 ghc->memslot = gfn_to_memslot(kvm, gfn);
1532 ghc->hva = gfn_to_hva_many(ghc->memslot, gfn, NULL);
1533 if (!kvm_is_error_hva(ghc->hva))
1540 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
1542 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1543 void *data, unsigned long len)
1545 struct kvm_memslots *slots = kvm_memslots(kvm);
1548 if (slots->generation != ghc->generation)
1549 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
1551 if (kvm_is_error_hva(ghc->hva))
1554 r = __copy_to_user((void __user *)ghc->hva, data, len);
1557 mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT);
1561 EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
1563 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1564 void *data, unsigned long len)
1566 struct kvm_memslots *slots = kvm_memslots(kvm);
1569 if (slots->generation != ghc->generation)
1570 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
1572 if (kvm_is_error_hva(ghc->hva))
1575 r = __copy_from_user(data, (void __user *)ghc->hva, len);
1581 EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
1583 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1585 return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page,
1588 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1590 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1592 gfn_t gfn = gpa >> PAGE_SHIFT;
1594 int offset = offset_in_page(gpa);
1597 while ((seg = next_segment(len, offset)) != 0) {
1598 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1607 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1609 void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot,
1612 if (memslot && memslot->dirty_bitmap) {
1613 unsigned long rel_gfn = gfn - memslot->base_gfn;
1615 set_bit_le(rel_gfn, memslot->dirty_bitmap);
1619 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1621 struct kvm_memory_slot *memslot;
1623 memslot = gfn_to_memslot(kvm, gfn);
1624 mark_page_dirty_in_slot(kvm, memslot, gfn);
1628 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1630 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1635 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1637 if (kvm_arch_vcpu_runnable(vcpu)) {
1638 kvm_make_request(KVM_REQ_UNHALT, vcpu);
1641 if (kvm_cpu_has_pending_timer(vcpu))
1643 if (signal_pending(current))
1649 finish_wait(&vcpu->wq, &wait);
1654 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
1656 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
1659 int cpu = vcpu->cpu;
1660 wait_queue_head_t *wqp;
1662 wqp = kvm_arch_vcpu_wq(vcpu);
1663 if (waitqueue_active(wqp)) {
1664 wake_up_interruptible(wqp);
1665 ++vcpu->stat.halt_wakeup;
1669 if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
1670 if (kvm_arch_vcpu_should_kick(vcpu))
1671 smp_send_reschedule(cpu);
1674 EXPORT_SYMBOL_GPL(kvm_vcpu_kick);
1675 #endif /* !CONFIG_S390 */
1677 void kvm_resched(struct kvm_vcpu *vcpu)
1679 if (!need_resched())
1683 EXPORT_SYMBOL_GPL(kvm_resched);
1685 bool kvm_vcpu_yield_to(struct kvm_vcpu *target)
1688 struct task_struct *task = NULL;
1692 pid = rcu_dereference(target->pid);
1694 task = get_pid_task(target->pid, PIDTYPE_PID);
1698 if (task->flags & PF_VCPU) {
1699 put_task_struct(task);
1702 ret = yield_to(task, 1);
1703 put_task_struct(task);
1707 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to);
1709 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
1711 * Helper that checks whether a VCPU is eligible for directed yield.
1712 * Most eligible candidate to yield is decided by following heuristics:
1714 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
1715 * (preempted lock holder), indicated by @in_spin_loop.
1716 * Set at the beiginning and cleared at the end of interception/PLE handler.
1718 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
1719 * chance last time (mostly it has become eligible now since we have probably
1720 * yielded to lockholder in last iteration. This is done by toggling
1721 * @dy_eligible each time a VCPU checked for eligibility.)
1723 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
1724 * to preempted lock-holder could result in wrong VCPU selection and CPU
1725 * burning. Giving priority for a potential lock-holder increases lock
1728 * Since algorithm is based on heuristics, accessing another VCPU data without
1729 * locking does not harm. It may result in trying to yield to same VCPU, fail
1730 * and continue with next VCPU and so on.
1732 bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu)
1736 eligible = !vcpu->spin_loop.in_spin_loop ||
1737 (vcpu->spin_loop.in_spin_loop &&
1738 vcpu->spin_loop.dy_eligible);
1740 if (vcpu->spin_loop.in_spin_loop)
1741 kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible);
1747 void kvm_vcpu_on_spin(struct kvm_vcpu *me)
1749 struct kvm *kvm = me->kvm;
1750 struct kvm_vcpu *vcpu;
1751 int last_boosted_vcpu = me->kvm->last_boosted_vcpu;
1757 kvm_vcpu_set_in_spin_loop(me, true);
1759 * We boost the priority of a VCPU that is runnable but not
1760 * currently running, because it got preempted by something
1761 * else and called schedule in __vcpu_run. Hopefully that
1762 * VCPU is holding the lock that we need and will release it.
1763 * We approximate round-robin by starting at the last boosted VCPU.
1765 for (pass = 0; pass < 2 && !yielded && try; pass++) {
1766 kvm_for_each_vcpu(i, vcpu, kvm) {
1767 if (!pass && i <= last_boosted_vcpu) {
1768 i = last_boosted_vcpu;
1770 } else if (pass && i > last_boosted_vcpu)
1772 if (!ACCESS_ONCE(vcpu->preempted))
1776 if (waitqueue_active(&vcpu->wq))
1778 if (!kvm_vcpu_eligible_for_directed_yield(vcpu))
1781 yielded = kvm_vcpu_yield_to(vcpu);
1783 kvm->last_boosted_vcpu = i;
1785 } else if (yielded < 0) {
1792 kvm_vcpu_set_in_spin_loop(me, false);
1794 /* Ensure vcpu is not eligible during next spinloop */
1795 kvm_vcpu_set_dy_eligible(me, false);
1797 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
1799 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1801 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1804 if (vmf->pgoff == 0)
1805 page = virt_to_page(vcpu->run);
1807 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
1808 page = virt_to_page(vcpu->arch.pio_data);
1810 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1811 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1812 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1815 return kvm_arch_vcpu_fault(vcpu, vmf);
1821 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
1822 .fault = kvm_vcpu_fault,
1825 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1827 vma->vm_ops = &kvm_vcpu_vm_ops;
1831 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1833 struct kvm_vcpu *vcpu = filp->private_data;
1835 kvm_put_kvm(vcpu->kvm);
1839 static struct file_operations kvm_vcpu_fops = {
1840 .release = kvm_vcpu_release,
1841 .unlocked_ioctl = kvm_vcpu_ioctl,
1842 #ifdef CONFIG_COMPAT
1843 .compat_ioctl = kvm_vcpu_compat_ioctl,
1845 .mmap = kvm_vcpu_mmap,
1846 .llseek = noop_llseek,
1850 * Allocates an inode for the vcpu.
1852 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1854 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR);
1858 * Creates some virtual cpus. Good luck creating more than one.
1860 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
1863 struct kvm_vcpu *vcpu, *v;
1865 vcpu = kvm_arch_vcpu_create(kvm, id);
1867 return PTR_ERR(vcpu);
1869 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1871 r = kvm_arch_vcpu_setup(vcpu);
1875 mutex_lock(&kvm->lock);
1876 if (!kvm_vcpu_compatible(vcpu)) {
1878 goto unlock_vcpu_destroy;
1880 if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
1882 goto unlock_vcpu_destroy;
1885 kvm_for_each_vcpu(r, v, kvm)
1886 if (v->vcpu_id == id) {
1888 goto unlock_vcpu_destroy;
1891 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
1893 /* Now it's all set up, let userspace reach it */
1895 r = create_vcpu_fd(vcpu);
1898 goto unlock_vcpu_destroy;
1901 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
1903 atomic_inc(&kvm->online_vcpus);
1905 mutex_unlock(&kvm->lock);
1906 kvm_arch_vcpu_postcreate(vcpu);
1909 unlock_vcpu_destroy:
1910 mutex_unlock(&kvm->lock);
1912 kvm_arch_vcpu_destroy(vcpu);
1916 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1919 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1920 vcpu->sigset_active = 1;
1921 vcpu->sigset = *sigset;
1923 vcpu->sigset_active = 0;
1927 static long kvm_vcpu_ioctl(struct file *filp,
1928 unsigned int ioctl, unsigned long arg)
1930 struct kvm_vcpu *vcpu = filp->private_data;
1931 void __user *argp = (void __user *)arg;
1933 struct kvm_fpu *fpu = NULL;
1934 struct kvm_sregs *kvm_sregs = NULL;
1936 if (vcpu->kvm->mm != current->mm)
1939 #if defined(CONFIG_S390) || defined(CONFIG_PPC)
1941 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1942 * so vcpu_load() would break it.
1944 if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT)
1945 return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1949 r = vcpu_load(vcpu);
1957 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
1958 trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
1960 case KVM_GET_REGS: {
1961 struct kvm_regs *kvm_regs;
1964 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1967 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
1971 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1978 case KVM_SET_REGS: {
1979 struct kvm_regs *kvm_regs;
1982 kvm_regs = memdup_user(argp, sizeof(*kvm_regs));
1983 if (IS_ERR(kvm_regs)) {
1984 r = PTR_ERR(kvm_regs);
1987 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
1991 case KVM_GET_SREGS: {
1992 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1996 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
2000 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
2005 case KVM_SET_SREGS: {
2006 kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs));
2007 if (IS_ERR(kvm_sregs)) {
2008 r = PTR_ERR(kvm_sregs);
2012 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
2015 case KVM_GET_MP_STATE: {
2016 struct kvm_mp_state mp_state;
2018 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
2022 if (copy_to_user(argp, &mp_state, sizeof mp_state))
2027 case KVM_SET_MP_STATE: {
2028 struct kvm_mp_state mp_state;
2031 if (copy_from_user(&mp_state, argp, sizeof mp_state))
2033 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
2036 case KVM_TRANSLATE: {
2037 struct kvm_translation tr;
2040 if (copy_from_user(&tr, argp, sizeof tr))
2042 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
2046 if (copy_to_user(argp, &tr, sizeof tr))
2051 case KVM_SET_GUEST_DEBUG: {
2052 struct kvm_guest_debug dbg;
2055 if (copy_from_user(&dbg, argp, sizeof dbg))
2057 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
2060 case KVM_SET_SIGNAL_MASK: {
2061 struct kvm_signal_mask __user *sigmask_arg = argp;
2062 struct kvm_signal_mask kvm_sigmask;
2063 sigset_t sigset, *p;
2068 if (copy_from_user(&kvm_sigmask, argp,
2069 sizeof kvm_sigmask))
2072 if (kvm_sigmask.len != sizeof sigset)
2075 if (copy_from_user(&sigset, sigmask_arg->sigset,
2080 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
2084 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
2088 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
2092 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
2098 fpu = memdup_user(argp, sizeof(*fpu));
2104 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
2108 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
2117 #ifdef CONFIG_COMPAT
2118 static long kvm_vcpu_compat_ioctl(struct file *filp,
2119 unsigned int ioctl, unsigned long arg)
2121 struct kvm_vcpu *vcpu = filp->private_data;
2122 void __user *argp = compat_ptr(arg);
2125 if (vcpu->kvm->mm != current->mm)
2129 case KVM_SET_SIGNAL_MASK: {
2130 struct kvm_signal_mask __user *sigmask_arg = argp;
2131 struct kvm_signal_mask kvm_sigmask;
2132 compat_sigset_t csigset;
2137 if (copy_from_user(&kvm_sigmask, argp,
2138 sizeof kvm_sigmask))
2141 if (kvm_sigmask.len != sizeof csigset)
2144 if (copy_from_user(&csigset, sigmask_arg->sigset,
2147 sigset_from_compat(&sigset, &csigset);
2148 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2150 r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL);
2154 r = kvm_vcpu_ioctl(filp, ioctl, arg);
2162 static int kvm_device_ioctl_attr(struct kvm_device *dev,
2163 int (*accessor)(struct kvm_device *dev,
2164 struct kvm_device_attr *attr),
2167 struct kvm_device_attr attr;
2172 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
2175 return accessor(dev, &attr);
2178 static long kvm_device_ioctl(struct file *filp, unsigned int ioctl,
2181 struct kvm_device *dev = filp->private_data;
2184 case KVM_SET_DEVICE_ATTR:
2185 return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg);
2186 case KVM_GET_DEVICE_ATTR:
2187 return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg);
2188 case KVM_HAS_DEVICE_ATTR:
2189 return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg);
2191 if (dev->ops->ioctl)
2192 return dev->ops->ioctl(dev, ioctl, arg);
2198 void kvm_device_get(struct kvm_device *dev)
2200 atomic_inc(&dev->users);
2203 void kvm_device_put(struct kvm_device *dev)
2205 if (atomic_dec_and_test(&dev->users))
2206 dev->ops->destroy(dev);
2209 static int kvm_device_release(struct inode *inode, struct file *filp)
2211 struct kvm_device *dev = filp->private_data;
2212 struct kvm *kvm = dev->kvm;
2214 kvm_device_put(dev);
2219 static const struct file_operations kvm_device_fops = {
2220 .unlocked_ioctl = kvm_device_ioctl,
2221 .release = kvm_device_release,
2224 struct kvm_device *kvm_device_from_filp(struct file *filp)
2226 if (filp->f_op != &kvm_device_fops)
2229 return filp->private_data;
2232 static int kvm_ioctl_create_device(struct kvm *kvm,
2233 struct kvm_create_device *cd)
2235 struct kvm_device_ops *ops = NULL;
2236 struct kvm_device *dev;
2237 bool test = cd->flags & KVM_CREATE_DEVICE_TEST;
2241 #ifdef CONFIG_KVM_MPIC
2242 case KVM_DEV_TYPE_FSL_MPIC_20:
2243 case KVM_DEV_TYPE_FSL_MPIC_42:
2244 ops = &kvm_mpic_ops;
2254 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2260 atomic_set(&dev->users, 1);
2262 ret = ops->create(dev, cd->type);
2268 ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR);
2279 static long kvm_vm_ioctl(struct file *filp,
2280 unsigned int ioctl, unsigned long arg)
2282 struct kvm *kvm = filp->private_data;
2283 void __user *argp = (void __user *)arg;
2286 if (kvm->mm != current->mm)
2289 case KVM_CREATE_VCPU:
2290 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2292 case KVM_SET_USER_MEMORY_REGION: {
2293 struct kvm_userspace_memory_region kvm_userspace_mem;
2296 if (copy_from_user(&kvm_userspace_mem, argp,
2297 sizeof kvm_userspace_mem))
2300 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem);
2303 case KVM_GET_DIRTY_LOG: {
2304 struct kvm_dirty_log log;
2307 if (copy_from_user(&log, argp, sizeof log))
2309 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2312 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2313 case KVM_REGISTER_COALESCED_MMIO: {
2314 struct kvm_coalesced_mmio_zone zone;
2316 if (copy_from_user(&zone, argp, sizeof zone))
2318 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
2321 case KVM_UNREGISTER_COALESCED_MMIO: {
2322 struct kvm_coalesced_mmio_zone zone;
2324 if (copy_from_user(&zone, argp, sizeof zone))
2326 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
2331 struct kvm_irqfd data;
2334 if (copy_from_user(&data, argp, sizeof data))
2336 r = kvm_irqfd(kvm, &data);
2339 case KVM_IOEVENTFD: {
2340 struct kvm_ioeventfd data;
2343 if (copy_from_user(&data, argp, sizeof data))
2345 r = kvm_ioeventfd(kvm, &data);
2348 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2349 case KVM_SET_BOOT_CPU_ID:
2351 mutex_lock(&kvm->lock);
2352 if (atomic_read(&kvm->online_vcpus) != 0)
2355 kvm->bsp_vcpu_id = arg;
2356 mutex_unlock(&kvm->lock);
2359 #ifdef CONFIG_HAVE_KVM_MSI
2360 case KVM_SIGNAL_MSI: {
2364 if (copy_from_user(&msi, argp, sizeof msi))
2366 r = kvm_send_userspace_msi(kvm, &msi);
2370 #ifdef __KVM_HAVE_IRQ_LINE
2371 case KVM_IRQ_LINE_STATUS:
2372 case KVM_IRQ_LINE: {
2373 struct kvm_irq_level irq_event;
2376 if (copy_from_user(&irq_event, argp, sizeof irq_event))
2379 r = kvm_vm_ioctl_irq_line(kvm, &irq_event,
2380 ioctl == KVM_IRQ_LINE_STATUS);
2385 if (ioctl == KVM_IRQ_LINE_STATUS) {
2386 if (copy_to_user(argp, &irq_event, sizeof irq_event))
2394 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2395 case KVM_SET_GSI_ROUTING: {
2396 struct kvm_irq_routing routing;
2397 struct kvm_irq_routing __user *urouting;
2398 struct kvm_irq_routing_entry *entries;
2401 if (copy_from_user(&routing, argp, sizeof(routing)))
2404 if (routing.nr >= KVM_MAX_IRQ_ROUTES)
2409 entries = vmalloc(routing.nr * sizeof(*entries));
2414 if (copy_from_user(entries, urouting->entries,
2415 routing.nr * sizeof(*entries)))
2416 goto out_free_irq_routing;
2417 r = kvm_set_irq_routing(kvm, entries, routing.nr,
2419 out_free_irq_routing:
2423 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
2424 case KVM_CREATE_DEVICE: {
2425 struct kvm_create_device cd;
2428 if (copy_from_user(&cd, argp, sizeof(cd)))
2431 r = kvm_ioctl_create_device(kvm, &cd);
2436 if (copy_to_user(argp, &cd, sizeof(cd)))
2443 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
2445 r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
2451 #ifdef CONFIG_COMPAT
2452 struct compat_kvm_dirty_log {
2456 compat_uptr_t dirty_bitmap; /* one bit per page */
2461 static long kvm_vm_compat_ioctl(struct file *filp,
2462 unsigned int ioctl, unsigned long arg)
2464 struct kvm *kvm = filp->private_data;
2467 if (kvm->mm != current->mm)
2470 case KVM_GET_DIRTY_LOG: {
2471 struct compat_kvm_dirty_log compat_log;
2472 struct kvm_dirty_log log;
2475 if (copy_from_user(&compat_log, (void __user *)arg,
2476 sizeof(compat_log)))
2478 log.slot = compat_log.slot;
2479 log.padding1 = compat_log.padding1;
2480 log.padding2 = compat_log.padding2;
2481 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
2483 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2487 r = kvm_vm_ioctl(filp, ioctl, arg);
2495 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2497 struct page *page[1];
2500 gfn_t gfn = vmf->pgoff;
2501 struct kvm *kvm = vma->vm_file->private_data;
2503 addr = gfn_to_hva(kvm, gfn);
2504 if (kvm_is_error_hva(addr))
2505 return VM_FAULT_SIGBUS;
2507 npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
2509 if (unlikely(npages != 1))
2510 return VM_FAULT_SIGBUS;
2512 vmf->page = page[0];
2516 static const struct vm_operations_struct kvm_vm_vm_ops = {
2517 .fault = kvm_vm_fault,
2520 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2522 vma->vm_ops = &kvm_vm_vm_ops;
2526 static struct file_operations kvm_vm_fops = {
2527 .release = kvm_vm_release,
2528 .unlocked_ioctl = kvm_vm_ioctl,
2529 #ifdef CONFIG_COMPAT
2530 .compat_ioctl = kvm_vm_compat_ioctl,
2532 .mmap = kvm_vm_mmap,
2533 .llseek = noop_llseek,
2536 static int kvm_dev_ioctl_create_vm(unsigned long type)
2541 kvm = kvm_create_vm(type);
2543 return PTR_ERR(kvm);
2544 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2545 r = kvm_coalesced_mmio_init(kvm);
2551 r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
2558 static long kvm_dev_ioctl_check_extension_generic(long arg)
2561 case KVM_CAP_USER_MEMORY:
2562 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
2563 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
2564 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2565 case KVM_CAP_SET_BOOT_CPU_ID:
2567 case KVM_CAP_INTERNAL_ERROR_DATA:
2568 #ifdef CONFIG_HAVE_KVM_MSI
2569 case KVM_CAP_SIGNAL_MSI:
2571 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2572 case KVM_CAP_IRQFD_RESAMPLE:
2575 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2576 case KVM_CAP_IRQ_ROUTING:
2577 return KVM_MAX_IRQ_ROUTES;
2582 return kvm_dev_ioctl_check_extension(arg);
2585 static long kvm_dev_ioctl(struct file *filp,
2586 unsigned int ioctl, unsigned long arg)
2591 case KVM_GET_API_VERSION:
2595 r = KVM_API_VERSION;
2598 r = kvm_dev_ioctl_create_vm(arg);
2600 case KVM_CHECK_EXTENSION:
2601 r = kvm_dev_ioctl_check_extension_generic(arg);
2603 case KVM_GET_VCPU_MMAP_SIZE:
2607 r = PAGE_SIZE; /* struct kvm_run */
2609 r += PAGE_SIZE; /* pio data page */
2611 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2612 r += PAGE_SIZE; /* coalesced mmio ring page */
2615 case KVM_TRACE_ENABLE:
2616 case KVM_TRACE_PAUSE:
2617 case KVM_TRACE_DISABLE:
2621 return kvm_arch_dev_ioctl(filp, ioctl, arg);
2627 static struct file_operations kvm_chardev_ops = {
2628 .unlocked_ioctl = kvm_dev_ioctl,
2629 .compat_ioctl = kvm_dev_ioctl,
2630 .llseek = noop_llseek,
2633 static struct miscdevice kvm_dev = {
2639 static void hardware_enable_nolock(void *junk)
2641 int cpu = raw_smp_processor_id();
2644 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
2647 cpumask_set_cpu(cpu, cpus_hardware_enabled);
2649 r = kvm_arch_hardware_enable(NULL);
2652 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2653 atomic_inc(&hardware_enable_failed);
2654 printk(KERN_INFO "kvm: enabling virtualization on "
2655 "CPU%d failed\n", cpu);
2659 static void hardware_enable(void *junk)
2661 raw_spin_lock(&kvm_lock);
2662 hardware_enable_nolock(junk);
2663 raw_spin_unlock(&kvm_lock);
2666 static void hardware_disable_nolock(void *junk)
2668 int cpu = raw_smp_processor_id();
2670 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
2672 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2673 kvm_arch_hardware_disable(NULL);
2676 static void hardware_disable(void *junk)
2678 raw_spin_lock(&kvm_lock);
2679 hardware_disable_nolock(junk);
2680 raw_spin_unlock(&kvm_lock);
2683 static void hardware_disable_all_nolock(void)
2685 BUG_ON(!kvm_usage_count);
2688 if (!kvm_usage_count)
2689 on_each_cpu(hardware_disable_nolock, NULL, 1);
2692 static void hardware_disable_all(void)
2694 raw_spin_lock(&kvm_lock);
2695 hardware_disable_all_nolock();
2696 raw_spin_unlock(&kvm_lock);
2699 static int hardware_enable_all(void)
2703 raw_spin_lock(&kvm_lock);
2706 if (kvm_usage_count == 1) {
2707 atomic_set(&hardware_enable_failed, 0);
2708 on_each_cpu(hardware_enable_nolock, NULL, 1);
2710 if (atomic_read(&hardware_enable_failed)) {
2711 hardware_disable_all_nolock();
2716 raw_spin_unlock(&kvm_lock);
2721 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2726 if (!kvm_usage_count)
2729 val &= ~CPU_TASKS_FROZEN;
2732 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2734 hardware_disable(NULL);
2737 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2739 hardware_enable(NULL);
2745 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2749 * Some (well, at least mine) BIOSes hang on reboot if
2752 * And Intel TXT required VMX off for all cpu when system shutdown.
2754 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2755 kvm_rebooting = true;
2756 on_each_cpu(hardware_disable_nolock, NULL, 1);
2760 static struct notifier_block kvm_reboot_notifier = {
2761 .notifier_call = kvm_reboot,
2765 static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
2769 for (i = 0; i < bus->dev_count; i++) {
2770 struct kvm_io_device *pos = bus->range[i].dev;
2772 kvm_iodevice_destructor(pos);
2777 static int kvm_io_bus_sort_cmp(const void *p1, const void *p2)
2779 const struct kvm_io_range *r1 = p1;
2780 const struct kvm_io_range *r2 = p2;
2782 if (r1->addr < r2->addr)
2784 if (r1->addr + r1->len > r2->addr + r2->len)
2789 static int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev,
2790 gpa_t addr, int len)
2792 bus->range[bus->dev_count++] = (struct kvm_io_range) {
2798 sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range),
2799 kvm_io_bus_sort_cmp, NULL);
2804 static int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus,
2805 gpa_t addr, int len)
2807 struct kvm_io_range *range, key;
2810 key = (struct kvm_io_range) {
2815 range = bsearch(&key, bus->range, bus->dev_count,
2816 sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp);
2820 off = range - bus->range;
2822 while (off > 0 && kvm_io_bus_sort_cmp(&key, &bus->range[off-1]) == 0)
2828 /* kvm_io_bus_write - called under kvm->slots_lock */
2829 int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2830 int len, const void *val)
2833 struct kvm_io_bus *bus;
2834 struct kvm_io_range range;
2836 range = (struct kvm_io_range) {
2841 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2842 idx = kvm_io_bus_get_first_dev(bus, addr, len);
2846 while (idx < bus->dev_count &&
2847 kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) {
2848 if (!kvm_iodevice_write(bus->range[idx].dev, addr, len, val))
2856 /* kvm_io_bus_read - called under kvm->slots_lock */
2857 int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2861 struct kvm_io_bus *bus;
2862 struct kvm_io_range range;
2864 range = (struct kvm_io_range) {
2869 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2870 idx = kvm_io_bus_get_first_dev(bus, addr, len);
2874 while (idx < bus->dev_count &&
2875 kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) {
2876 if (!kvm_iodevice_read(bus->range[idx].dev, addr, len, val))
2884 /* Caller must hold slots_lock. */
2885 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2886 int len, struct kvm_io_device *dev)
2888 struct kvm_io_bus *new_bus, *bus;
2890 bus = kvm->buses[bus_idx];
2891 if (bus->dev_count > NR_IOBUS_DEVS - 1)
2894 new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count + 1) *
2895 sizeof(struct kvm_io_range)), GFP_KERNEL);
2898 memcpy(new_bus, bus, sizeof(*bus) + (bus->dev_count *
2899 sizeof(struct kvm_io_range)));
2900 kvm_io_bus_insert_dev(new_bus, dev, addr, len);
2901 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2902 synchronize_srcu_expedited(&kvm->srcu);
2908 /* Caller must hold slots_lock. */
2909 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2910 struct kvm_io_device *dev)
2913 struct kvm_io_bus *new_bus, *bus;
2915 bus = kvm->buses[bus_idx];
2917 for (i = 0; i < bus->dev_count; i++)
2918 if (bus->range[i].dev == dev) {
2926 new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count - 1) *
2927 sizeof(struct kvm_io_range)), GFP_KERNEL);
2931 memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range));
2932 new_bus->dev_count--;
2933 memcpy(new_bus->range + i, bus->range + i + 1,
2934 (new_bus->dev_count - i) * sizeof(struct kvm_io_range));
2936 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2937 synchronize_srcu_expedited(&kvm->srcu);
2942 static struct notifier_block kvm_cpu_notifier = {
2943 .notifier_call = kvm_cpu_hotplug,
2946 static int vm_stat_get(void *_offset, u64 *val)
2948 unsigned offset = (long)_offset;
2952 raw_spin_lock(&kvm_lock);
2953 list_for_each_entry(kvm, &vm_list, vm_list)
2954 *val += *(u32 *)((void *)kvm + offset);
2955 raw_spin_unlock(&kvm_lock);
2959 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
2961 static int vcpu_stat_get(void *_offset, u64 *val)
2963 unsigned offset = (long)_offset;
2965 struct kvm_vcpu *vcpu;
2969 raw_spin_lock(&kvm_lock);
2970 list_for_each_entry(kvm, &vm_list, vm_list)
2971 kvm_for_each_vcpu(i, vcpu, kvm)
2972 *val += *(u32 *)((void *)vcpu + offset);
2974 raw_spin_unlock(&kvm_lock);
2978 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
2980 static const struct file_operations *stat_fops[] = {
2981 [KVM_STAT_VCPU] = &vcpu_stat_fops,
2982 [KVM_STAT_VM] = &vm_stat_fops,
2985 static int kvm_init_debug(void)
2988 struct kvm_stats_debugfs_item *p;
2990 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
2991 if (kvm_debugfs_dir == NULL)
2994 for (p = debugfs_entries; p->name; ++p) {
2995 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
2996 (void *)(long)p->offset,
2997 stat_fops[p->kind]);
2998 if (p->dentry == NULL)
3005 debugfs_remove_recursive(kvm_debugfs_dir);
3010 static void kvm_exit_debug(void)
3012 struct kvm_stats_debugfs_item *p;
3014 for (p = debugfs_entries; p->name; ++p)
3015 debugfs_remove(p->dentry);
3016 debugfs_remove(kvm_debugfs_dir);
3019 static int kvm_suspend(void)
3021 if (kvm_usage_count)
3022 hardware_disable_nolock(NULL);
3026 static void kvm_resume(void)
3028 if (kvm_usage_count) {
3029 WARN_ON(raw_spin_is_locked(&kvm_lock));
3030 hardware_enable_nolock(NULL);
3034 static struct syscore_ops kvm_syscore_ops = {
3035 .suspend = kvm_suspend,
3036 .resume = kvm_resume,
3040 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
3042 return container_of(pn, struct kvm_vcpu, preempt_notifier);
3045 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
3047 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3048 if (vcpu->preempted)
3049 vcpu->preempted = false;
3051 kvm_arch_vcpu_load(vcpu, cpu);
3054 static void kvm_sched_out(struct preempt_notifier *pn,
3055 struct task_struct *next)
3057 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3059 if (current->state == TASK_RUNNING)
3060 vcpu->preempted = true;
3061 kvm_arch_vcpu_put(vcpu);
3064 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
3065 struct module *module)
3070 r = kvm_irqfd_init();
3073 r = kvm_arch_init(opaque);
3077 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
3082 r = kvm_arch_hardware_setup();
3086 for_each_online_cpu(cpu) {
3087 smp_call_function_single(cpu,
3088 kvm_arch_check_processor_compat,
3094 r = register_cpu_notifier(&kvm_cpu_notifier);
3097 register_reboot_notifier(&kvm_reboot_notifier);
3099 /* A kmem cache lets us meet the alignment requirements of fx_save. */
3101 vcpu_align = __alignof__(struct kvm_vcpu);
3102 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
3104 if (!kvm_vcpu_cache) {
3109 r = kvm_async_pf_init();
3113 kvm_chardev_ops.owner = module;
3114 kvm_vm_fops.owner = module;
3115 kvm_vcpu_fops.owner = module;
3117 r = misc_register(&kvm_dev);
3119 printk(KERN_ERR "kvm: misc device register failed\n");
3123 register_syscore_ops(&kvm_syscore_ops);
3125 kvm_preempt_ops.sched_in = kvm_sched_in;
3126 kvm_preempt_ops.sched_out = kvm_sched_out;
3128 r = kvm_init_debug();
3130 printk(KERN_ERR "kvm: create debugfs files failed\n");
3137 unregister_syscore_ops(&kvm_syscore_ops);
3139 kvm_async_pf_deinit();
3141 kmem_cache_destroy(kvm_vcpu_cache);
3143 unregister_reboot_notifier(&kvm_reboot_notifier);
3144 unregister_cpu_notifier(&kvm_cpu_notifier);
3147 kvm_arch_hardware_unsetup();
3149 free_cpumask_var(cpus_hardware_enabled);
3157 EXPORT_SYMBOL_GPL(kvm_init);
3162 misc_deregister(&kvm_dev);
3163 kmem_cache_destroy(kvm_vcpu_cache);
3164 kvm_async_pf_deinit();
3165 unregister_syscore_ops(&kvm_syscore_ops);
3166 unregister_reboot_notifier(&kvm_reboot_notifier);
3167 unregister_cpu_notifier(&kvm_cpu_notifier);
3168 on_each_cpu(hardware_disable_nolock, NULL, 1);
3169 kvm_arch_hardware_unsetup();
3172 free_cpumask_var(cpus_hardware_enabled);
3174 EXPORT_SYMBOL_GPL(kvm_exit);