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_update_eoibitmap_request(struct kvm *kvm)
222 make_all_cpus_request(kvm, KVM_REQ_EOIBITMAP);
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);
248 r = kvm_arch_vcpu_init(vcpu);
254 free_page((unsigned long)vcpu->run);
258 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
260 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
263 kvm_arch_vcpu_uninit(vcpu);
264 free_page((unsigned long)vcpu->run);
266 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
268 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
269 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
271 return container_of(mn, struct kvm, mmu_notifier);
274 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
275 struct mm_struct *mm,
276 unsigned long address)
278 struct kvm *kvm = mmu_notifier_to_kvm(mn);
279 int need_tlb_flush, idx;
282 * When ->invalidate_page runs, the linux pte has been zapped
283 * already but the page is still allocated until
284 * ->invalidate_page returns. So if we increase the sequence
285 * here the kvm page fault will notice if the spte can't be
286 * established because the page is going to be freed. If
287 * instead the kvm page fault establishes the spte before
288 * ->invalidate_page runs, kvm_unmap_hva will release it
291 * The sequence increase only need to be seen at spin_unlock
292 * time, and not at spin_lock time.
294 * Increasing the sequence after the spin_unlock would be
295 * unsafe because the kvm page fault could then establish the
296 * pte after kvm_unmap_hva returned, without noticing the page
297 * is going to be freed.
299 idx = srcu_read_lock(&kvm->srcu);
300 spin_lock(&kvm->mmu_lock);
302 kvm->mmu_notifier_seq++;
303 need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty;
304 /* we've to flush the tlb before the pages can be freed */
306 kvm_flush_remote_tlbs(kvm);
308 spin_unlock(&kvm->mmu_lock);
309 srcu_read_unlock(&kvm->srcu, idx);
312 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
313 struct mm_struct *mm,
314 unsigned long address,
317 struct kvm *kvm = mmu_notifier_to_kvm(mn);
320 idx = srcu_read_lock(&kvm->srcu);
321 spin_lock(&kvm->mmu_lock);
322 kvm->mmu_notifier_seq++;
323 kvm_set_spte_hva(kvm, address, pte);
324 spin_unlock(&kvm->mmu_lock);
325 srcu_read_unlock(&kvm->srcu, idx);
328 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
329 struct mm_struct *mm,
333 struct kvm *kvm = mmu_notifier_to_kvm(mn);
334 int need_tlb_flush = 0, idx;
336 idx = srcu_read_lock(&kvm->srcu);
337 spin_lock(&kvm->mmu_lock);
339 * The count increase must become visible at unlock time as no
340 * spte can be established without taking the mmu_lock and
341 * count is also read inside the mmu_lock critical section.
343 kvm->mmu_notifier_count++;
344 need_tlb_flush = kvm_unmap_hva_range(kvm, start, end);
345 need_tlb_flush |= kvm->tlbs_dirty;
346 /* we've to flush the tlb before the pages can be freed */
348 kvm_flush_remote_tlbs(kvm);
350 spin_unlock(&kvm->mmu_lock);
351 srcu_read_unlock(&kvm->srcu, idx);
354 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
355 struct mm_struct *mm,
359 struct kvm *kvm = mmu_notifier_to_kvm(mn);
361 spin_lock(&kvm->mmu_lock);
363 * This sequence increase will notify the kvm page fault that
364 * the page that is going to be mapped in the spte could have
367 kvm->mmu_notifier_seq++;
370 * The above sequence increase must be visible before the
371 * below count decrease, which is ensured by the smp_wmb above
372 * in conjunction with the smp_rmb in mmu_notifier_retry().
374 kvm->mmu_notifier_count--;
375 spin_unlock(&kvm->mmu_lock);
377 BUG_ON(kvm->mmu_notifier_count < 0);
380 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
381 struct mm_struct *mm,
382 unsigned long address)
384 struct kvm *kvm = mmu_notifier_to_kvm(mn);
387 idx = srcu_read_lock(&kvm->srcu);
388 spin_lock(&kvm->mmu_lock);
390 young = kvm_age_hva(kvm, address);
392 kvm_flush_remote_tlbs(kvm);
394 spin_unlock(&kvm->mmu_lock);
395 srcu_read_unlock(&kvm->srcu, idx);
400 static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn,
401 struct mm_struct *mm,
402 unsigned long address)
404 struct kvm *kvm = mmu_notifier_to_kvm(mn);
407 idx = srcu_read_lock(&kvm->srcu);
408 spin_lock(&kvm->mmu_lock);
409 young = kvm_test_age_hva(kvm, address);
410 spin_unlock(&kvm->mmu_lock);
411 srcu_read_unlock(&kvm->srcu, idx);
416 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
417 struct mm_struct *mm)
419 struct kvm *kvm = mmu_notifier_to_kvm(mn);
422 idx = srcu_read_lock(&kvm->srcu);
423 kvm_arch_flush_shadow_all(kvm);
424 srcu_read_unlock(&kvm->srcu, idx);
427 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
428 .invalidate_page = kvm_mmu_notifier_invalidate_page,
429 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
430 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
431 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
432 .test_young = kvm_mmu_notifier_test_young,
433 .change_pte = kvm_mmu_notifier_change_pte,
434 .release = kvm_mmu_notifier_release,
437 static int kvm_init_mmu_notifier(struct kvm *kvm)
439 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
440 return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
443 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
445 static int kvm_init_mmu_notifier(struct kvm *kvm)
450 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
452 static void kvm_init_memslots_id(struct kvm *kvm)
455 struct kvm_memslots *slots = kvm->memslots;
457 for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
458 slots->id_to_index[i] = slots->memslots[i].id = i;
461 static struct kvm *kvm_create_vm(unsigned long type)
464 struct kvm *kvm = kvm_arch_alloc_vm();
467 return ERR_PTR(-ENOMEM);
469 r = kvm_arch_init_vm(kvm, type);
471 goto out_err_nodisable;
473 r = hardware_enable_all();
475 goto out_err_nodisable;
477 #ifdef CONFIG_HAVE_KVM_IRQCHIP
478 INIT_HLIST_HEAD(&kvm->mask_notifier_list);
479 INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
482 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX);
485 kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
488 kvm_init_memslots_id(kvm);
489 if (init_srcu_struct(&kvm->srcu))
491 for (i = 0; i < KVM_NR_BUSES; i++) {
492 kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus),
498 spin_lock_init(&kvm->mmu_lock);
499 kvm->mm = current->mm;
500 atomic_inc(&kvm->mm->mm_count);
501 kvm_eventfd_init(kvm);
502 mutex_init(&kvm->lock);
503 mutex_init(&kvm->irq_lock);
504 mutex_init(&kvm->slots_lock);
505 atomic_set(&kvm->users_count, 1);
507 r = kvm_init_mmu_notifier(kvm);
511 raw_spin_lock(&kvm_lock);
512 list_add(&kvm->vm_list, &vm_list);
513 raw_spin_unlock(&kvm_lock);
518 cleanup_srcu_struct(&kvm->srcu);
520 hardware_disable_all();
522 for (i = 0; i < KVM_NR_BUSES; i++)
523 kfree(kvm->buses[i]);
524 kfree(kvm->memslots);
525 kvm_arch_free_vm(kvm);
530 * Avoid using vmalloc for a small buffer.
531 * Should not be used when the size is statically known.
533 void *kvm_kvzalloc(unsigned long size)
535 if (size > PAGE_SIZE)
536 return vzalloc(size);
538 return kzalloc(size, GFP_KERNEL);
541 void kvm_kvfree(const void *addr)
543 if (is_vmalloc_addr(addr))
549 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
551 if (!memslot->dirty_bitmap)
554 kvm_kvfree(memslot->dirty_bitmap);
555 memslot->dirty_bitmap = NULL;
559 * Free any memory in @free but not in @dont.
561 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
562 struct kvm_memory_slot *dont)
564 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
565 kvm_destroy_dirty_bitmap(free);
567 kvm_arch_free_memslot(free, dont);
572 void kvm_free_physmem(struct kvm *kvm)
574 struct kvm_memslots *slots = kvm->memslots;
575 struct kvm_memory_slot *memslot;
577 kvm_for_each_memslot(memslot, slots)
578 kvm_free_physmem_slot(memslot, NULL);
580 kfree(kvm->memslots);
583 static void kvm_destroy_vm(struct kvm *kvm)
586 struct mm_struct *mm = kvm->mm;
588 kvm_arch_sync_events(kvm);
589 raw_spin_lock(&kvm_lock);
590 list_del(&kvm->vm_list);
591 raw_spin_unlock(&kvm_lock);
592 kvm_free_irq_routing(kvm);
593 for (i = 0; i < KVM_NR_BUSES; i++)
594 kvm_io_bus_destroy(kvm->buses[i]);
595 kvm_coalesced_mmio_free(kvm);
596 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
597 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
599 kvm_arch_flush_shadow_all(kvm);
601 kvm_arch_destroy_vm(kvm);
602 kvm_free_physmem(kvm);
603 cleanup_srcu_struct(&kvm->srcu);
604 kvm_arch_free_vm(kvm);
605 hardware_disable_all();
609 void kvm_get_kvm(struct kvm *kvm)
611 atomic_inc(&kvm->users_count);
613 EXPORT_SYMBOL_GPL(kvm_get_kvm);
615 void kvm_put_kvm(struct kvm *kvm)
617 if (atomic_dec_and_test(&kvm->users_count))
620 EXPORT_SYMBOL_GPL(kvm_put_kvm);
623 static int kvm_vm_release(struct inode *inode, struct file *filp)
625 struct kvm *kvm = filp->private_data;
627 kvm_irqfd_release(kvm);
634 * Allocation size is twice as large as the actual dirty bitmap size.
635 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
637 static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
640 unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
642 memslot->dirty_bitmap = kvm_kvzalloc(dirty_bytes);
643 if (!memslot->dirty_bitmap)
646 #endif /* !CONFIG_S390 */
650 static int cmp_memslot(const void *slot1, const void *slot2)
652 struct kvm_memory_slot *s1, *s2;
654 s1 = (struct kvm_memory_slot *)slot1;
655 s2 = (struct kvm_memory_slot *)slot2;
657 if (s1->npages < s2->npages)
659 if (s1->npages > s2->npages)
666 * Sort the memslots base on its size, so the larger slots
667 * will get better fit.
669 static void sort_memslots(struct kvm_memslots *slots)
673 sort(slots->memslots, KVM_MEM_SLOTS_NUM,
674 sizeof(struct kvm_memory_slot), cmp_memslot, NULL);
676 for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
677 slots->id_to_index[slots->memslots[i].id] = i;
680 void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new,
685 struct kvm_memory_slot *old = id_to_memslot(slots, id);
686 unsigned long npages = old->npages;
689 if (new->npages != npages)
690 sort_memslots(slots);
693 slots->generation = last_generation + 1;
696 static int check_memory_region_flags(struct kvm_userspace_memory_region *mem)
698 u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES;
700 #ifdef KVM_CAP_READONLY_MEM
701 valid_flags |= KVM_MEM_READONLY;
704 if (mem->flags & ~valid_flags)
710 static struct kvm_memslots *install_new_memslots(struct kvm *kvm,
711 struct kvm_memslots *slots, struct kvm_memory_slot *new)
713 struct kvm_memslots *old_memslots = kvm->memslots;
715 update_memslots(slots, new, kvm->memslots->generation);
716 rcu_assign_pointer(kvm->memslots, slots);
717 synchronize_srcu_expedited(&kvm->srcu);
722 * KVM_SET_USER_MEMORY_REGION ioctl allows the following operations:
723 * - create a new memory slot
724 * - delete an existing memory slot
725 * - modify an existing memory slot
726 * -- move it in the guest physical memory space
727 * -- just change its flags
729 * Since flags can be changed by some of these operations, the following
730 * differentiation is the best we can do for __kvm_set_memory_region():
740 * Allocate some memory and give it an address in the guest physical address
743 * Discontiguous memory is allowed, mostly for framebuffers.
745 * Must be called holding mmap_sem for write.
747 int __kvm_set_memory_region(struct kvm *kvm,
748 struct kvm_userspace_memory_region *mem,
753 unsigned long npages;
754 struct kvm_memory_slot *slot;
755 struct kvm_memory_slot old, new;
756 struct kvm_memslots *slots = NULL, *old_memslots;
757 enum kvm_mr_change change;
759 r = check_memory_region_flags(mem);
764 /* General sanity checks */
765 if (mem->memory_size & (PAGE_SIZE - 1))
767 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
769 /* We can read the guest memory with __xxx_user() later on. */
771 ((mem->userspace_addr & (PAGE_SIZE - 1)) ||
772 !access_ok(VERIFY_WRITE,
773 (void __user *)(unsigned long)mem->userspace_addr,
776 if (mem->slot >= KVM_MEM_SLOTS_NUM)
778 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
781 slot = id_to_memslot(kvm->memslots, mem->slot);
782 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
783 npages = mem->memory_size >> PAGE_SHIFT;
786 if (npages > KVM_MEM_MAX_NR_PAGES)
790 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
795 new.base_gfn = base_gfn;
797 new.flags = mem->flags;
802 change = KVM_MR_CREATE;
803 else { /* Modify an existing slot. */
804 if ((mem->userspace_addr != old.userspace_addr) ||
805 (npages != old.npages) ||
806 ((new.flags ^ old.flags) & KVM_MEM_READONLY))
809 if (base_gfn != old.base_gfn)
810 change = KVM_MR_MOVE;
811 else if (new.flags != old.flags)
812 change = KVM_MR_FLAGS_ONLY;
813 else { /* Nothing to change. */
818 } else if (old.npages) {
819 change = KVM_MR_DELETE;
820 } else /* Modify a non-existent slot: disallowed. */
823 if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
824 /* Check for overlaps */
826 kvm_for_each_memslot(slot, kvm->memslots) {
827 if ((slot->id >= KVM_USER_MEM_SLOTS) ||
828 (slot->id == mem->slot))
830 if (!((base_gfn + npages <= slot->base_gfn) ||
831 (base_gfn >= slot->base_gfn + slot->npages)))
836 /* Free page dirty bitmap if unneeded */
837 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
838 new.dirty_bitmap = NULL;
841 if (change == KVM_MR_CREATE) {
842 new.userspace_addr = mem->userspace_addr;
844 if (kvm_arch_create_memslot(&new, npages))
848 /* Allocate page dirty bitmap if needed */
849 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
850 if (kvm_create_dirty_bitmap(&new) < 0)
854 if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) {
856 slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots),
860 slot = id_to_memslot(slots, mem->slot);
861 slot->flags |= KVM_MEMSLOT_INVALID;
863 old_memslots = install_new_memslots(kvm, slots, NULL);
865 /* slot was deleted or moved, clear iommu mapping */
866 kvm_iommu_unmap_pages(kvm, &old);
867 /* From this point no new shadow pages pointing to a deleted,
868 * or moved, memslot will be created.
870 * validation of sp->gfn happens in:
871 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
872 * - kvm_is_visible_gfn (mmu_check_roots)
874 kvm_arch_flush_shadow_memslot(kvm, slot);
875 slots = old_memslots;
878 r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc);
884 * We can re-use the old_memslots from above, the only difference
885 * from the currently installed memslots is the invalid flag. This
886 * will get overwritten by update_memslots anyway.
889 slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots),
896 * IOMMU mapping: New slots need to be mapped. Old slots need to be
897 * un-mapped and re-mapped if their base changes. Since base change
898 * unmapping is handled above with slot deletion, mapping alone is
899 * needed here. Anything else the iommu might care about for existing
900 * slots (size changes, userspace addr changes and read-only flag
901 * changes) is disallowed above, so any other attribute changes getting
902 * here can be skipped.
904 if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
905 r = kvm_iommu_map_pages(kvm, &new);
910 /* actual memory is freed via old in kvm_free_physmem_slot below */
911 if (change == KVM_MR_DELETE) {
912 new.dirty_bitmap = NULL;
913 memset(&new.arch, 0, sizeof(new.arch));
916 old_memslots = install_new_memslots(kvm, slots, &new);
918 kvm_arch_commit_memory_region(kvm, mem, old, user_alloc);
920 kvm_free_physmem_slot(&old, &new);
928 kvm_free_physmem_slot(&new, &old);
932 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
934 int kvm_set_memory_region(struct kvm *kvm,
935 struct kvm_userspace_memory_region *mem,
940 mutex_lock(&kvm->slots_lock);
941 r = __kvm_set_memory_region(kvm, mem, user_alloc);
942 mutex_unlock(&kvm->slots_lock);
945 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
947 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
949 kvm_userspace_memory_region *mem,
952 if (mem->slot >= KVM_USER_MEM_SLOTS)
954 return kvm_set_memory_region(kvm, mem, user_alloc);
957 int kvm_get_dirty_log(struct kvm *kvm,
958 struct kvm_dirty_log *log, int *is_dirty)
960 struct kvm_memory_slot *memslot;
963 unsigned long any = 0;
966 if (log->slot >= KVM_USER_MEM_SLOTS)
969 memslot = id_to_memslot(kvm->memslots, log->slot);
971 if (!memslot->dirty_bitmap)
974 n = kvm_dirty_bitmap_bytes(memslot);
976 for (i = 0; !any && i < n/sizeof(long); ++i)
977 any = memslot->dirty_bitmap[i];
980 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
991 bool kvm_largepages_enabled(void)
993 return largepages_enabled;
996 void kvm_disable_largepages(void)
998 largepages_enabled = false;
1000 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
1002 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
1004 return __gfn_to_memslot(kvm_memslots(kvm), gfn);
1006 EXPORT_SYMBOL_GPL(gfn_to_memslot);
1008 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
1010 struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn);
1012 if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS ||
1013 memslot->flags & KVM_MEMSLOT_INVALID)
1018 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
1020 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
1022 struct vm_area_struct *vma;
1023 unsigned long addr, size;
1027 addr = gfn_to_hva(kvm, gfn);
1028 if (kvm_is_error_hva(addr))
1031 down_read(¤t->mm->mmap_sem);
1032 vma = find_vma(current->mm, addr);
1036 size = vma_kernel_pagesize(vma);
1039 up_read(¤t->mm->mmap_sem);
1044 static bool memslot_is_readonly(struct kvm_memory_slot *slot)
1046 return slot->flags & KVM_MEM_READONLY;
1049 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1050 gfn_t *nr_pages, bool write)
1052 if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
1053 return KVM_HVA_ERR_BAD;
1055 if (memslot_is_readonly(slot) && write)
1056 return KVM_HVA_ERR_RO_BAD;
1059 *nr_pages = slot->npages - (gfn - slot->base_gfn);
1061 return __gfn_to_hva_memslot(slot, gfn);
1064 static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1067 return __gfn_to_hva_many(slot, gfn, nr_pages, true);
1070 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot,
1073 return gfn_to_hva_many(slot, gfn, NULL);
1075 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot);
1077 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1079 return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
1081 EXPORT_SYMBOL_GPL(gfn_to_hva);
1084 * The hva returned by this function is only allowed to be read.
1085 * It should pair with kvm_read_hva() or kvm_read_hva_atomic().
1087 static unsigned long gfn_to_hva_read(struct kvm *kvm, gfn_t gfn)
1089 return __gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL, false);
1092 static int kvm_read_hva(void *data, void __user *hva, int len)
1094 return __copy_from_user(data, hva, len);
1097 static int kvm_read_hva_atomic(void *data, void __user *hva, int len)
1099 return __copy_from_user_inatomic(data, hva, len);
1102 int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm,
1103 unsigned long start, int write, struct page **page)
1105 int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET;
1108 flags |= FOLL_WRITE;
1110 return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL);
1113 static inline int check_user_page_hwpoison(unsigned long addr)
1115 int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE;
1117 rc = __get_user_pages(current, current->mm, addr, 1,
1118 flags, NULL, NULL, NULL);
1119 return rc == -EHWPOISON;
1123 * The atomic path to get the writable pfn which will be stored in @pfn,
1124 * true indicates success, otherwise false is returned.
1126 static bool hva_to_pfn_fast(unsigned long addr, bool atomic, bool *async,
1127 bool write_fault, bool *writable, pfn_t *pfn)
1129 struct page *page[1];
1132 if (!(async || atomic))
1136 * Fast pin a writable pfn only if it is a write fault request
1137 * or the caller allows to map a writable pfn for a read fault
1140 if (!(write_fault || writable))
1143 npages = __get_user_pages_fast(addr, 1, 1, page);
1145 *pfn = page_to_pfn(page[0]);
1156 * The slow path to get the pfn of the specified host virtual address,
1157 * 1 indicates success, -errno is returned if error is detected.
1159 static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault,
1160 bool *writable, pfn_t *pfn)
1162 struct page *page[1];
1168 *writable = write_fault;
1171 down_read(¤t->mm->mmap_sem);
1172 npages = get_user_page_nowait(current, current->mm,
1173 addr, write_fault, page);
1174 up_read(¤t->mm->mmap_sem);
1176 npages = get_user_pages_fast(addr, 1, write_fault,
1181 /* map read fault as writable if possible */
1182 if (unlikely(!write_fault) && writable) {
1183 struct page *wpage[1];
1185 npages = __get_user_pages_fast(addr, 1, 1, wpage);
1194 *pfn = page_to_pfn(page[0]);
1198 static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault)
1200 if (unlikely(!(vma->vm_flags & VM_READ)))
1203 if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE))))
1210 * Pin guest page in memory and return its pfn.
1211 * @addr: host virtual address which maps memory to the guest
1212 * @atomic: whether this function can sleep
1213 * @async: whether this function need to wait IO complete if the
1214 * host page is not in the memory
1215 * @write_fault: whether we should get a writable host page
1216 * @writable: whether it allows to map a writable host page for !@write_fault
1218 * The function will map a writable host page for these two cases:
1219 * 1): @write_fault = true
1220 * 2): @write_fault = false && @writable, @writable will tell the caller
1221 * whether the mapping is writable.
1223 static pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async,
1224 bool write_fault, bool *writable)
1226 struct vm_area_struct *vma;
1230 /* we can do it either atomically or asynchronously, not both */
1231 BUG_ON(atomic && async);
1233 if (hva_to_pfn_fast(addr, atomic, async, write_fault, writable, &pfn))
1237 return KVM_PFN_ERR_FAULT;
1239 npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn);
1243 down_read(¤t->mm->mmap_sem);
1244 if (npages == -EHWPOISON ||
1245 (!async && check_user_page_hwpoison(addr))) {
1246 pfn = KVM_PFN_ERR_HWPOISON;
1250 vma = find_vma_intersection(current->mm, addr, addr + 1);
1253 pfn = KVM_PFN_ERR_FAULT;
1254 else if ((vma->vm_flags & VM_PFNMAP)) {
1255 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) +
1257 BUG_ON(!kvm_is_mmio_pfn(pfn));
1259 if (async && vma_is_valid(vma, write_fault))
1261 pfn = KVM_PFN_ERR_FAULT;
1264 up_read(¤t->mm->mmap_sem);
1269 __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn, bool atomic,
1270 bool *async, bool write_fault, bool *writable)
1272 unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault);
1274 if (addr == KVM_HVA_ERR_RO_BAD)
1275 return KVM_PFN_ERR_RO_FAULT;
1277 if (kvm_is_error_hva(addr))
1278 return KVM_PFN_NOSLOT;
1280 /* Do not map writable pfn in the readonly memslot. */
1281 if (writable && memslot_is_readonly(slot)) {
1286 return hva_to_pfn(addr, atomic, async, write_fault,
1290 static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async,
1291 bool write_fault, bool *writable)
1293 struct kvm_memory_slot *slot;
1298 slot = gfn_to_memslot(kvm, gfn);
1300 return __gfn_to_pfn_memslot(slot, gfn, atomic, async, write_fault,
1304 pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
1306 return __gfn_to_pfn(kvm, gfn, true, NULL, true, NULL);
1308 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
1310 pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async,
1311 bool write_fault, bool *writable)
1313 return __gfn_to_pfn(kvm, gfn, false, async, write_fault, writable);
1315 EXPORT_SYMBOL_GPL(gfn_to_pfn_async);
1317 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1319 return __gfn_to_pfn(kvm, gfn, false, NULL, true, NULL);
1321 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1323 pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1326 return __gfn_to_pfn(kvm, gfn, false, NULL, write_fault, writable);
1328 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
1330 pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
1332 return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL);
1335 pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn)
1337 return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL);
1339 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic);
1341 int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
1347 addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry);
1348 if (kvm_is_error_hva(addr))
1351 if (entry < nr_pages)
1354 return __get_user_pages_fast(addr, nr_pages, 1, pages);
1356 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
1358 static struct page *kvm_pfn_to_page(pfn_t pfn)
1360 if (is_error_noslot_pfn(pfn))
1361 return KVM_ERR_PTR_BAD_PAGE;
1363 if (kvm_is_mmio_pfn(pfn)) {
1365 return KVM_ERR_PTR_BAD_PAGE;
1368 return pfn_to_page(pfn);
1371 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1375 pfn = gfn_to_pfn(kvm, gfn);
1377 return kvm_pfn_to_page(pfn);
1380 EXPORT_SYMBOL_GPL(gfn_to_page);
1382 void kvm_release_page_clean(struct page *page)
1384 WARN_ON(is_error_page(page));
1386 kvm_release_pfn_clean(page_to_pfn(page));
1388 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1390 void kvm_release_pfn_clean(pfn_t pfn)
1392 if (!is_error_noslot_pfn(pfn) && !kvm_is_mmio_pfn(pfn))
1393 put_page(pfn_to_page(pfn));
1395 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1397 void kvm_release_page_dirty(struct page *page)
1399 WARN_ON(is_error_page(page));
1401 kvm_release_pfn_dirty(page_to_pfn(page));
1403 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1405 void kvm_release_pfn_dirty(pfn_t pfn)
1407 kvm_set_pfn_dirty(pfn);
1408 kvm_release_pfn_clean(pfn);
1410 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1412 void kvm_set_page_dirty(struct page *page)
1414 kvm_set_pfn_dirty(page_to_pfn(page));
1416 EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
1418 void kvm_set_pfn_dirty(pfn_t pfn)
1420 if (!kvm_is_mmio_pfn(pfn)) {
1421 struct page *page = pfn_to_page(pfn);
1422 if (!PageReserved(page))
1426 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1428 void kvm_set_pfn_accessed(pfn_t pfn)
1430 if (!kvm_is_mmio_pfn(pfn))
1431 mark_page_accessed(pfn_to_page(pfn));
1433 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1435 void kvm_get_pfn(pfn_t pfn)
1437 if (!kvm_is_mmio_pfn(pfn))
1438 get_page(pfn_to_page(pfn));
1440 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1442 static int next_segment(unsigned long len, int offset)
1444 if (len > PAGE_SIZE - offset)
1445 return PAGE_SIZE - offset;
1450 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1456 addr = gfn_to_hva_read(kvm, gfn);
1457 if (kvm_is_error_hva(addr))
1459 r = kvm_read_hva(data, (void __user *)addr + offset, len);
1464 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1466 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1468 gfn_t gfn = gpa >> PAGE_SHIFT;
1470 int offset = offset_in_page(gpa);
1473 while ((seg = next_segment(len, offset)) != 0) {
1474 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1484 EXPORT_SYMBOL_GPL(kvm_read_guest);
1486 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1491 gfn_t gfn = gpa >> PAGE_SHIFT;
1492 int offset = offset_in_page(gpa);
1494 addr = gfn_to_hva_read(kvm, gfn);
1495 if (kvm_is_error_hva(addr))
1497 pagefault_disable();
1498 r = kvm_read_hva_atomic(data, (void __user *)addr + offset, len);
1504 EXPORT_SYMBOL(kvm_read_guest_atomic);
1506 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1507 int offset, int len)
1512 addr = gfn_to_hva(kvm, gfn);
1513 if (kvm_is_error_hva(addr))
1515 r = __copy_to_user((void __user *)addr + offset, data, len);
1518 mark_page_dirty(kvm, gfn);
1521 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1523 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1526 gfn_t gfn = gpa >> PAGE_SHIFT;
1528 int offset = offset_in_page(gpa);
1531 while ((seg = next_segment(len, offset)) != 0) {
1532 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1543 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1544 gpa_t gpa, unsigned long len)
1546 struct kvm_memslots *slots = kvm_memslots(kvm);
1547 int offset = offset_in_page(gpa);
1548 gfn_t start_gfn = gpa >> PAGE_SHIFT;
1549 gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT;
1550 gfn_t nr_pages_needed = end_gfn - start_gfn + 1;
1551 gfn_t nr_pages_avail;
1554 ghc->generation = slots->generation;
1556 ghc->memslot = gfn_to_memslot(kvm, start_gfn);
1557 ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, &nr_pages_avail);
1558 if (!kvm_is_error_hva(ghc->hva) && nr_pages_avail >= nr_pages_needed) {
1562 * If the requested region crosses two memslots, we still
1563 * verify that the entire region is valid here.
1565 while (start_gfn <= end_gfn) {
1566 ghc->memslot = gfn_to_memslot(kvm, start_gfn);
1567 ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn,
1569 if (kvm_is_error_hva(ghc->hva))
1571 start_gfn += nr_pages_avail;
1573 /* Use the slow path for cross page reads and writes. */
1574 ghc->memslot = NULL;
1578 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
1580 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1581 void *data, unsigned long len)
1583 struct kvm_memslots *slots = kvm_memslots(kvm);
1586 BUG_ON(len > ghc->len);
1588 if (slots->generation != ghc->generation)
1589 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len);
1591 if (unlikely(!ghc->memslot))
1592 return kvm_write_guest(kvm, ghc->gpa, data, len);
1594 if (kvm_is_error_hva(ghc->hva))
1597 r = __copy_to_user((void __user *)ghc->hva, data, len);
1600 mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT);
1604 EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
1606 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1607 void *data, unsigned long len)
1609 struct kvm_memslots *slots = kvm_memslots(kvm);
1612 BUG_ON(len > ghc->len);
1614 if (slots->generation != ghc->generation)
1615 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len);
1617 if (unlikely(!ghc->memslot))
1618 return kvm_read_guest(kvm, ghc->gpa, data, len);
1620 if (kvm_is_error_hva(ghc->hva))
1623 r = __copy_from_user(data, (void __user *)ghc->hva, len);
1629 EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
1631 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1633 return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page,
1636 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1638 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1640 gfn_t gfn = gpa >> PAGE_SHIFT;
1642 int offset = offset_in_page(gpa);
1645 while ((seg = next_segment(len, offset)) != 0) {
1646 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1655 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1657 void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot,
1660 if (memslot && memslot->dirty_bitmap) {
1661 unsigned long rel_gfn = gfn - memslot->base_gfn;
1663 set_bit_le(rel_gfn, memslot->dirty_bitmap);
1667 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1669 struct kvm_memory_slot *memslot;
1671 memslot = gfn_to_memslot(kvm, gfn);
1672 mark_page_dirty_in_slot(kvm, memslot, gfn);
1676 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1678 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1683 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1685 if (kvm_arch_vcpu_runnable(vcpu)) {
1686 kvm_make_request(KVM_REQ_UNHALT, vcpu);
1689 if (kvm_cpu_has_pending_timer(vcpu))
1691 if (signal_pending(current))
1697 finish_wait(&vcpu->wq, &wait);
1702 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
1704 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
1707 int cpu = vcpu->cpu;
1708 wait_queue_head_t *wqp;
1710 wqp = kvm_arch_vcpu_wq(vcpu);
1711 if (waitqueue_active(wqp)) {
1712 wake_up_interruptible(wqp);
1713 ++vcpu->stat.halt_wakeup;
1717 if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
1718 if (kvm_arch_vcpu_should_kick(vcpu))
1719 smp_send_reschedule(cpu);
1722 #endif /* !CONFIG_S390 */
1724 void kvm_resched(struct kvm_vcpu *vcpu)
1726 if (!need_resched())
1730 EXPORT_SYMBOL_GPL(kvm_resched);
1732 bool kvm_vcpu_yield_to(struct kvm_vcpu *target)
1735 struct task_struct *task = NULL;
1739 pid = rcu_dereference(target->pid);
1741 task = get_pid_task(target->pid, PIDTYPE_PID);
1745 if (task->flags & PF_VCPU) {
1746 put_task_struct(task);
1749 ret = yield_to(task, 1);
1750 put_task_struct(task);
1754 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to);
1756 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
1758 * Helper that checks whether a VCPU is eligible for directed yield.
1759 * Most eligible candidate to yield is decided by following heuristics:
1761 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
1762 * (preempted lock holder), indicated by @in_spin_loop.
1763 * Set at the beiginning and cleared at the end of interception/PLE handler.
1765 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
1766 * chance last time (mostly it has become eligible now since we have probably
1767 * yielded to lockholder in last iteration. This is done by toggling
1768 * @dy_eligible each time a VCPU checked for eligibility.)
1770 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
1771 * to preempted lock-holder could result in wrong VCPU selection and CPU
1772 * burning. Giving priority for a potential lock-holder increases lock
1775 * Since algorithm is based on heuristics, accessing another VCPU data without
1776 * locking does not harm. It may result in trying to yield to same VCPU, fail
1777 * and continue with next VCPU and so on.
1779 bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu)
1783 eligible = !vcpu->spin_loop.in_spin_loop ||
1784 (vcpu->spin_loop.in_spin_loop &&
1785 vcpu->spin_loop.dy_eligible);
1787 if (vcpu->spin_loop.in_spin_loop)
1788 kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible);
1794 void kvm_vcpu_on_spin(struct kvm_vcpu *me)
1796 struct kvm *kvm = me->kvm;
1797 struct kvm_vcpu *vcpu;
1798 int last_boosted_vcpu = me->kvm->last_boosted_vcpu;
1804 kvm_vcpu_set_in_spin_loop(me, true);
1806 * We boost the priority of a VCPU that is runnable but not
1807 * currently running, because it got preempted by something
1808 * else and called schedule in __vcpu_run. Hopefully that
1809 * VCPU is holding the lock that we need and will release it.
1810 * We approximate round-robin by starting at the last boosted VCPU.
1812 for (pass = 0; pass < 2 && !yielded && try; pass++) {
1813 kvm_for_each_vcpu(i, vcpu, kvm) {
1814 if (!pass && i <= last_boosted_vcpu) {
1815 i = last_boosted_vcpu;
1817 } else if (pass && i > last_boosted_vcpu)
1821 if (waitqueue_active(&vcpu->wq))
1823 if (!kvm_vcpu_eligible_for_directed_yield(vcpu))
1826 yielded = kvm_vcpu_yield_to(vcpu);
1828 kvm->last_boosted_vcpu = i;
1830 } else if (yielded < 0) {
1837 kvm_vcpu_set_in_spin_loop(me, false);
1839 /* Ensure vcpu is not eligible during next spinloop */
1840 kvm_vcpu_set_dy_eligible(me, false);
1842 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
1844 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1846 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1849 if (vmf->pgoff == 0)
1850 page = virt_to_page(vcpu->run);
1852 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
1853 page = virt_to_page(vcpu->arch.pio_data);
1855 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1856 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1857 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1860 return kvm_arch_vcpu_fault(vcpu, vmf);
1866 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
1867 .fault = kvm_vcpu_fault,
1870 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1872 vma->vm_ops = &kvm_vcpu_vm_ops;
1876 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1878 struct kvm_vcpu *vcpu = filp->private_data;
1880 kvm_put_kvm(vcpu->kvm);
1884 static struct file_operations kvm_vcpu_fops = {
1885 .release = kvm_vcpu_release,
1886 .unlocked_ioctl = kvm_vcpu_ioctl,
1887 #ifdef CONFIG_COMPAT
1888 .compat_ioctl = kvm_vcpu_compat_ioctl,
1890 .mmap = kvm_vcpu_mmap,
1891 .llseek = noop_llseek,
1895 * Allocates an inode for the vcpu.
1897 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1899 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR);
1903 * Creates some virtual cpus. Good luck creating more than one.
1905 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
1908 struct kvm_vcpu *vcpu, *v;
1910 vcpu = kvm_arch_vcpu_create(kvm, id);
1912 return PTR_ERR(vcpu);
1914 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1916 r = kvm_arch_vcpu_setup(vcpu);
1920 mutex_lock(&kvm->lock);
1921 if (!kvm_vcpu_compatible(vcpu)) {
1923 goto unlock_vcpu_destroy;
1925 if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
1927 goto unlock_vcpu_destroy;
1930 kvm_for_each_vcpu(r, v, kvm)
1931 if (v->vcpu_id == id) {
1933 goto unlock_vcpu_destroy;
1936 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
1938 /* Now it's all set up, let userspace reach it */
1940 r = create_vcpu_fd(vcpu);
1943 goto unlock_vcpu_destroy;
1946 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
1948 atomic_inc(&kvm->online_vcpus);
1950 mutex_unlock(&kvm->lock);
1951 kvm_arch_vcpu_postcreate(vcpu);
1954 unlock_vcpu_destroy:
1955 mutex_unlock(&kvm->lock);
1957 kvm_arch_vcpu_destroy(vcpu);
1961 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1964 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1965 vcpu->sigset_active = 1;
1966 vcpu->sigset = *sigset;
1968 vcpu->sigset_active = 0;
1972 static long kvm_vcpu_ioctl(struct file *filp,
1973 unsigned int ioctl, unsigned long arg)
1975 struct kvm_vcpu *vcpu = filp->private_data;
1976 void __user *argp = (void __user *)arg;
1978 struct kvm_fpu *fpu = NULL;
1979 struct kvm_sregs *kvm_sregs = NULL;
1981 if (vcpu->kvm->mm != current->mm)
1984 #if defined(CONFIG_S390) || defined(CONFIG_PPC)
1986 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1987 * so vcpu_load() would break it.
1989 if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT)
1990 return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1994 r = vcpu_load(vcpu);
2002 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
2003 trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
2005 case KVM_GET_REGS: {
2006 struct kvm_regs *kvm_regs;
2009 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
2012 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
2016 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
2023 case KVM_SET_REGS: {
2024 struct kvm_regs *kvm_regs;
2027 kvm_regs = memdup_user(argp, sizeof(*kvm_regs));
2028 if (IS_ERR(kvm_regs)) {
2029 r = PTR_ERR(kvm_regs);
2032 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
2036 case KVM_GET_SREGS: {
2037 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
2041 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
2045 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
2050 case KVM_SET_SREGS: {
2051 kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs));
2052 if (IS_ERR(kvm_sregs)) {
2053 r = PTR_ERR(kvm_sregs);
2057 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
2060 case KVM_GET_MP_STATE: {
2061 struct kvm_mp_state mp_state;
2063 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
2067 if (copy_to_user(argp, &mp_state, sizeof mp_state))
2072 case KVM_SET_MP_STATE: {
2073 struct kvm_mp_state mp_state;
2076 if (copy_from_user(&mp_state, argp, sizeof mp_state))
2078 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
2081 case KVM_TRANSLATE: {
2082 struct kvm_translation tr;
2085 if (copy_from_user(&tr, argp, sizeof tr))
2087 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
2091 if (copy_to_user(argp, &tr, sizeof tr))
2096 case KVM_SET_GUEST_DEBUG: {
2097 struct kvm_guest_debug dbg;
2100 if (copy_from_user(&dbg, argp, sizeof dbg))
2102 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
2105 case KVM_SET_SIGNAL_MASK: {
2106 struct kvm_signal_mask __user *sigmask_arg = argp;
2107 struct kvm_signal_mask kvm_sigmask;
2108 sigset_t sigset, *p;
2113 if (copy_from_user(&kvm_sigmask, argp,
2114 sizeof kvm_sigmask))
2117 if (kvm_sigmask.len != sizeof sigset)
2120 if (copy_from_user(&sigset, sigmask_arg->sigset,
2125 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
2129 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
2133 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
2137 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
2143 fpu = memdup_user(argp, sizeof(*fpu));
2149 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
2153 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
2162 #ifdef CONFIG_COMPAT
2163 static long kvm_vcpu_compat_ioctl(struct file *filp,
2164 unsigned int ioctl, unsigned long arg)
2166 struct kvm_vcpu *vcpu = filp->private_data;
2167 void __user *argp = compat_ptr(arg);
2170 if (vcpu->kvm->mm != current->mm)
2174 case KVM_SET_SIGNAL_MASK: {
2175 struct kvm_signal_mask __user *sigmask_arg = argp;
2176 struct kvm_signal_mask kvm_sigmask;
2177 compat_sigset_t csigset;
2182 if (copy_from_user(&kvm_sigmask, argp,
2183 sizeof kvm_sigmask))
2186 if (kvm_sigmask.len != sizeof csigset)
2189 if (copy_from_user(&csigset, sigmask_arg->sigset,
2192 sigset_from_compat(&sigset, &csigset);
2193 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2195 r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL);
2199 r = kvm_vcpu_ioctl(filp, ioctl, arg);
2207 static long kvm_vm_ioctl(struct file *filp,
2208 unsigned int ioctl, unsigned long arg)
2210 struct kvm *kvm = filp->private_data;
2211 void __user *argp = (void __user *)arg;
2214 if (kvm->mm != current->mm)
2217 case KVM_CREATE_VCPU:
2218 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2220 case KVM_SET_USER_MEMORY_REGION: {
2221 struct kvm_userspace_memory_region kvm_userspace_mem;
2224 if (copy_from_user(&kvm_userspace_mem, argp,
2225 sizeof kvm_userspace_mem))
2228 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, true);
2231 case KVM_GET_DIRTY_LOG: {
2232 struct kvm_dirty_log log;
2235 if (copy_from_user(&log, argp, sizeof log))
2237 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2240 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2241 case KVM_REGISTER_COALESCED_MMIO: {
2242 struct kvm_coalesced_mmio_zone zone;
2244 if (copy_from_user(&zone, argp, sizeof zone))
2246 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
2249 case KVM_UNREGISTER_COALESCED_MMIO: {
2250 struct kvm_coalesced_mmio_zone zone;
2252 if (copy_from_user(&zone, argp, sizeof zone))
2254 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
2259 struct kvm_irqfd data;
2262 if (copy_from_user(&data, argp, sizeof data))
2264 r = kvm_irqfd(kvm, &data);
2267 case KVM_IOEVENTFD: {
2268 struct kvm_ioeventfd data;
2271 if (copy_from_user(&data, argp, sizeof data))
2273 r = kvm_ioeventfd(kvm, &data);
2276 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2277 case KVM_SET_BOOT_CPU_ID:
2279 mutex_lock(&kvm->lock);
2280 if (atomic_read(&kvm->online_vcpus) != 0)
2283 kvm->bsp_vcpu_id = arg;
2284 mutex_unlock(&kvm->lock);
2287 #ifdef CONFIG_HAVE_KVM_MSI
2288 case KVM_SIGNAL_MSI: {
2292 if (copy_from_user(&msi, argp, sizeof msi))
2294 r = kvm_send_userspace_msi(kvm, &msi);
2298 #ifdef __KVM_HAVE_IRQ_LINE
2299 case KVM_IRQ_LINE_STATUS:
2300 case KVM_IRQ_LINE: {
2301 struct kvm_irq_level irq_event;
2304 if (copy_from_user(&irq_event, argp, sizeof irq_event))
2307 r = kvm_vm_ioctl_irq_line(kvm, &irq_event);
2312 if (ioctl == KVM_IRQ_LINE_STATUS) {
2313 if (copy_to_user(argp, &irq_event, sizeof irq_event))
2322 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
2324 r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
2330 #ifdef CONFIG_COMPAT
2331 struct compat_kvm_dirty_log {
2335 compat_uptr_t dirty_bitmap; /* one bit per page */
2340 static long kvm_vm_compat_ioctl(struct file *filp,
2341 unsigned int ioctl, unsigned long arg)
2343 struct kvm *kvm = filp->private_data;
2346 if (kvm->mm != current->mm)
2349 case KVM_GET_DIRTY_LOG: {
2350 struct compat_kvm_dirty_log compat_log;
2351 struct kvm_dirty_log log;
2354 if (copy_from_user(&compat_log, (void __user *)arg,
2355 sizeof(compat_log)))
2357 log.slot = compat_log.slot;
2358 log.padding1 = compat_log.padding1;
2359 log.padding2 = compat_log.padding2;
2360 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
2362 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2366 r = kvm_vm_ioctl(filp, ioctl, arg);
2374 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2376 struct page *page[1];
2379 gfn_t gfn = vmf->pgoff;
2380 struct kvm *kvm = vma->vm_file->private_data;
2382 addr = gfn_to_hva(kvm, gfn);
2383 if (kvm_is_error_hva(addr))
2384 return VM_FAULT_SIGBUS;
2386 npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
2388 if (unlikely(npages != 1))
2389 return VM_FAULT_SIGBUS;
2391 vmf->page = page[0];
2395 static const struct vm_operations_struct kvm_vm_vm_ops = {
2396 .fault = kvm_vm_fault,
2399 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2401 vma->vm_ops = &kvm_vm_vm_ops;
2405 static struct file_operations kvm_vm_fops = {
2406 .release = kvm_vm_release,
2407 .unlocked_ioctl = kvm_vm_ioctl,
2408 #ifdef CONFIG_COMPAT
2409 .compat_ioctl = kvm_vm_compat_ioctl,
2411 .mmap = kvm_vm_mmap,
2412 .llseek = noop_llseek,
2415 static int kvm_dev_ioctl_create_vm(unsigned long type)
2420 kvm = kvm_create_vm(type);
2422 return PTR_ERR(kvm);
2423 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2424 r = kvm_coalesced_mmio_init(kvm);
2430 r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
2437 static long kvm_dev_ioctl_check_extension_generic(long arg)
2440 case KVM_CAP_USER_MEMORY:
2441 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
2442 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
2443 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2444 case KVM_CAP_SET_BOOT_CPU_ID:
2446 case KVM_CAP_INTERNAL_ERROR_DATA:
2447 #ifdef CONFIG_HAVE_KVM_MSI
2448 case KVM_CAP_SIGNAL_MSI:
2451 #ifdef KVM_CAP_IRQ_ROUTING
2452 case KVM_CAP_IRQ_ROUTING:
2453 return KVM_MAX_IRQ_ROUTES;
2458 return kvm_dev_ioctl_check_extension(arg);
2461 static long kvm_dev_ioctl(struct file *filp,
2462 unsigned int ioctl, unsigned long arg)
2467 case KVM_GET_API_VERSION:
2471 r = KVM_API_VERSION;
2474 r = kvm_dev_ioctl_create_vm(arg);
2476 case KVM_CHECK_EXTENSION:
2477 r = kvm_dev_ioctl_check_extension_generic(arg);
2479 case KVM_GET_VCPU_MMAP_SIZE:
2483 r = PAGE_SIZE; /* struct kvm_run */
2485 r += PAGE_SIZE; /* pio data page */
2487 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2488 r += PAGE_SIZE; /* coalesced mmio ring page */
2491 case KVM_TRACE_ENABLE:
2492 case KVM_TRACE_PAUSE:
2493 case KVM_TRACE_DISABLE:
2497 return kvm_arch_dev_ioctl(filp, ioctl, arg);
2503 static struct file_operations kvm_chardev_ops = {
2504 .unlocked_ioctl = kvm_dev_ioctl,
2505 .compat_ioctl = kvm_dev_ioctl,
2506 .llseek = noop_llseek,
2509 static struct miscdevice kvm_dev = {
2515 static void hardware_enable_nolock(void *junk)
2517 int cpu = raw_smp_processor_id();
2520 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
2523 cpumask_set_cpu(cpu, cpus_hardware_enabled);
2525 r = kvm_arch_hardware_enable(NULL);
2528 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2529 atomic_inc(&hardware_enable_failed);
2530 printk(KERN_INFO "kvm: enabling virtualization on "
2531 "CPU%d failed\n", cpu);
2535 static void hardware_enable(void *junk)
2537 raw_spin_lock(&kvm_lock);
2538 hardware_enable_nolock(junk);
2539 raw_spin_unlock(&kvm_lock);
2542 static void hardware_disable_nolock(void *junk)
2544 int cpu = raw_smp_processor_id();
2546 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
2548 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2549 kvm_arch_hardware_disable(NULL);
2552 static void hardware_disable(void *junk)
2554 raw_spin_lock(&kvm_lock);
2555 hardware_disable_nolock(junk);
2556 raw_spin_unlock(&kvm_lock);
2559 static void hardware_disable_all_nolock(void)
2561 BUG_ON(!kvm_usage_count);
2564 if (!kvm_usage_count)
2565 on_each_cpu(hardware_disable_nolock, NULL, 1);
2568 static void hardware_disable_all(void)
2570 raw_spin_lock(&kvm_lock);
2571 hardware_disable_all_nolock();
2572 raw_spin_unlock(&kvm_lock);
2575 static int hardware_enable_all(void)
2579 raw_spin_lock(&kvm_lock);
2582 if (kvm_usage_count == 1) {
2583 atomic_set(&hardware_enable_failed, 0);
2584 on_each_cpu(hardware_enable_nolock, NULL, 1);
2586 if (atomic_read(&hardware_enable_failed)) {
2587 hardware_disable_all_nolock();
2592 raw_spin_unlock(&kvm_lock);
2597 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2602 if (!kvm_usage_count)
2605 val &= ~CPU_TASKS_FROZEN;
2608 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2610 hardware_disable(NULL);
2613 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2615 hardware_enable(NULL);
2622 asmlinkage void kvm_spurious_fault(void)
2624 /* Fault while not rebooting. We want the trace. */
2627 EXPORT_SYMBOL_GPL(kvm_spurious_fault);
2629 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2633 * Some (well, at least mine) BIOSes hang on reboot if
2636 * And Intel TXT required VMX off for all cpu when system shutdown.
2638 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2639 kvm_rebooting = true;
2640 on_each_cpu(hardware_disable_nolock, NULL, 1);
2644 static struct notifier_block kvm_reboot_notifier = {
2645 .notifier_call = kvm_reboot,
2649 static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
2653 for (i = 0; i < bus->dev_count; i++) {
2654 struct kvm_io_device *pos = bus->range[i].dev;
2656 kvm_iodevice_destructor(pos);
2661 int kvm_io_bus_sort_cmp(const void *p1, const void *p2)
2663 const struct kvm_io_range *r1 = p1;
2664 const struct kvm_io_range *r2 = p2;
2666 if (r1->addr < r2->addr)
2668 if (r1->addr + r1->len > r2->addr + r2->len)
2673 int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev,
2674 gpa_t addr, int len)
2676 bus->range[bus->dev_count++] = (struct kvm_io_range) {
2682 sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range),
2683 kvm_io_bus_sort_cmp, NULL);
2688 int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus,
2689 gpa_t addr, int len)
2691 struct kvm_io_range *range, key;
2694 key = (struct kvm_io_range) {
2699 range = bsearch(&key, bus->range, bus->dev_count,
2700 sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp);
2704 off = range - bus->range;
2706 while (off > 0 && kvm_io_bus_sort_cmp(&key, &bus->range[off-1]) == 0)
2712 /* kvm_io_bus_write - called under kvm->slots_lock */
2713 int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2714 int len, const void *val)
2717 struct kvm_io_bus *bus;
2718 struct kvm_io_range range;
2720 range = (struct kvm_io_range) {
2725 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2726 idx = kvm_io_bus_get_first_dev(bus, addr, len);
2730 while (idx < bus->dev_count &&
2731 kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) {
2732 if (!kvm_iodevice_write(bus->range[idx].dev, addr, len, val))
2740 /* kvm_io_bus_read - called under kvm->slots_lock */
2741 int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2745 struct kvm_io_bus *bus;
2746 struct kvm_io_range range;
2748 range = (struct kvm_io_range) {
2753 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2754 idx = kvm_io_bus_get_first_dev(bus, addr, len);
2758 while (idx < bus->dev_count &&
2759 kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) {
2760 if (!kvm_iodevice_read(bus->range[idx].dev, addr, len, val))
2768 /* Caller must hold slots_lock. */
2769 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2770 int len, struct kvm_io_device *dev)
2772 struct kvm_io_bus *new_bus, *bus;
2774 bus = kvm->buses[bus_idx];
2775 if (bus->dev_count > NR_IOBUS_DEVS - 1)
2778 new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count + 1) *
2779 sizeof(struct kvm_io_range)), GFP_KERNEL);
2782 memcpy(new_bus, bus, sizeof(*bus) + (bus->dev_count *
2783 sizeof(struct kvm_io_range)));
2784 kvm_io_bus_insert_dev(new_bus, dev, addr, len);
2785 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2786 synchronize_srcu_expedited(&kvm->srcu);
2792 /* Caller must hold slots_lock. */
2793 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2794 struct kvm_io_device *dev)
2797 struct kvm_io_bus *new_bus, *bus;
2799 bus = kvm->buses[bus_idx];
2801 for (i = 0; i < bus->dev_count; i++)
2802 if (bus->range[i].dev == dev) {
2810 new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count - 1) *
2811 sizeof(struct kvm_io_range)), GFP_KERNEL);
2815 memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range));
2816 new_bus->dev_count--;
2817 memcpy(new_bus->range + i, bus->range + i + 1,
2818 (new_bus->dev_count - i) * sizeof(struct kvm_io_range));
2820 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2821 synchronize_srcu_expedited(&kvm->srcu);
2826 static struct notifier_block kvm_cpu_notifier = {
2827 .notifier_call = kvm_cpu_hotplug,
2830 static int vm_stat_get(void *_offset, u64 *val)
2832 unsigned offset = (long)_offset;
2836 raw_spin_lock(&kvm_lock);
2837 list_for_each_entry(kvm, &vm_list, vm_list)
2838 *val += *(u32 *)((void *)kvm + offset);
2839 raw_spin_unlock(&kvm_lock);
2843 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
2845 static int vcpu_stat_get(void *_offset, u64 *val)
2847 unsigned offset = (long)_offset;
2849 struct kvm_vcpu *vcpu;
2853 raw_spin_lock(&kvm_lock);
2854 list_for_each_entry(kvm, &vm_list, vm_list)
2855 kvm_for_each_vcpu(i, vcpu, kvm)
2856 *val += *(u32 *)((void *)vcpu + offset);
2858 raw_spin_unlock(&kvm_lock);
2862 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
2864 static const struct file_operations *stat_fops[] = {
2865 [KVM_STAT_VCPU] = &vcpu_stat_fops,
2866 [KVM_STAT_VM] = &vm_stat_fops,
2869 static int kvm_init_debug(void)
2872 struct kvm_stats_debugfs_item *p;
2874 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
2875 if (kvm_debugfs_dir == NULL)
2878 for (p = debugfs_entries; p->name; ++p) {
2879 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
2880 (void *)(long)p->offset,
2881 stat_fops[p->kind]);
2882 if (p->dentry == NULL)
2889 debugfs_remove_recursive(kvm_debugfs_dir);
2894 static void kvm_exit_debug(void)
2896 struct kvm_stats_debugfs_item *p;
2898 for (p = debugfs_entries; p->name; ++p)
2899 debugfs_remove(p->dentry);
2900 debugfs_remove(kvm_debugfs_dir);
2903 static int kvm_suspend(void)
2905 if (kvm_usage_count)
2906 hardware_disable_nolock(NULL);
2910 static void kvm_resume(void)
2912 if (kvm_usage_count) {
2913 WARN_ON(raw_spin_is_locked(&kvm_lock));
2914 hardware_enable_nolock(NULL);
2918 static struct syscore_ops kvm_syscore_ops = {
2919 .suspend = kvm_suspend,
2920 .resume = kvm_resume,
2924 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
2926 return container_of(pn, struct kvm_vcpu, preempt_notifier);
2929 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
2931 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2933 kvm_arch_vcpu_load(vcpu, cpu);
2936 static void kvm_sched_out(struct preempt_notifier *pn,
2937 struct task_struct *next)
2939 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2941 kvm_arch_vcpu_put(vcpu);
2944 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
2945 struct module *module)
2950 r = kvm_arch_init(opaque);
2954 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
2959 r = kvm_arch_hardware_setup();
2963 for_each_online_cpu(cpu) {
2964 smp_call_function_single(cpu,
2965 kvm_arch_check_processor_compat,
2971 r = register_cpu_notifier(&kvm_cpu_notifier);
2974 register_reboot_notifier(&kvm_reboot_notifier);
2976 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2978 vcpu_align = __alignof__(struct kvm_vcpu);
2979 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
2981 if (!kvm_vcpu_cache) {
2986 r = kvm_async_pf_init();
2990 kvm_chardev_ops.owner = module;
2991 kvm_vm_fops.owner = module;
2992 kvm_vcpu_fops.owner = module;
2994 r = misc_register(&kvm_dev);
2996 printk(KERN_ERR "kvm: misc device register failed\n");
3000 register_syscore_ops(&kvm_syscore_ops);
3002 kvm_preempt_ops.sched_in = kvm_sched_in;
3003 kvm_preempt_ops.sched_out = kvm_sched_out;
3005 r = kvm_init_debug();
3007 printk(KERN_ERR "kvm: create debugfs files failed\n");
3014 unregister_syscore_ops(&kvm_syscore_ops);
3016 kvm_async_pf_deinit();
3018 kmem_cache_destroy(kvm_vcpu_cache);
3020 unregister_reboot_notifier(&kvm_reboot_notifier);
3021 unregister_cpu_notifier(&kvm_cpu_notifier);
3024 kvm_arch_hardware_unsetup();
3026 free_cpumask_var(cpus_hardware_enabled);
3032 EXPORT_SYMBOL_GPL(kvm_init);
3037 misc_deregister(&kvm_dev);
3038 kmem_cache_destroy(kvm_vcpu_cache);
3039 kvm_async_pf_deinit();
3040 unregister_syscore_ops(&kvm_syscore_ops);
3041 unregister_reboot_notifier(&kvm_reboot_notifier);
3042 unregister_cpu_notifier(&kvm_cpu_notifier);
3043 on_each_cpu(hardware_disable_nolock, NULL, 1);
3044 kvm_arch_hardware_unsetup();
3046 free_cpumask_var(cpus_hardware_enabled);
3048 EXPORT_SYMBOL_GPL(kvm_exit);