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)
106 return PageReserved(pfn_to_page(pfn));
112 * Switches to specified vcpu, until a matching vcpu_put()
114 int vcpu_load(struct kvm_vcpu *vcpu)
118 if (mutex_lock_killable(&vcpu->mutex))
120 if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) {
121 /* The thread running this VCPU changed. */
122 struct pid *oldpid = vcpu->pid;
123 struct pid *newpid = get_task_pid(current, PIDTYPE_PID);
124 rcu_assign_pointer(vcpu->pid, newpid);
129 preempt_notifier_register(&vcpu->preempt_notifier);
130 kvm_arch_vcpu_load(vcpu, cpu);
135 void vcpu_put(struct kvm_vcpu *vcpu)
138 kvm_arch_vcpu_put(vcpu);
139 preempt_notifier_unregister(&vcpu->preempt_notifier);
141 mutex_unlock(&vcpu->mutex);
144 static void ack_flush(void *_completed)
148 static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
153 struct kvm_vcpu *vcpu;
155 zalloc_cpumask_var(&cpus, GFP_ATOMIC);
158 kvm_for_each_vcpu(i, vcpu, kvm) {
159 kvm_make_request(req, vcpu);
162 /* Set ->requests bit before we read ->mode */
165 if (cpus != NULL && cpu != -1 && cpu != me &&
166 kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE)
167 cpumask_set_cpu(cpu, cpus);
169 if (unlikely(cpus == NULL))
170 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
171 else if (!cpumask_empty(cpus))
172 smp_call_function_many(cpus, ack_flush, NULL, 1);
176 free_cpumask_var(cpus);
180 void kvm_flush_remote_tlbs(struct kvm *kvm)
182 long dirty_count = kvm->tlbs_dirty;
185 if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
186 ++kvm->stat.remote_tlb_flush;
187 cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
190 void kvm_reload_remote_mmus(struct kvm *kvm)
192 make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
195 void kvm_make_mclock_inprogress_request(struct kvm *kvm)
197 make_all_cpus_request(kvm, KVM_REQ_MCLOCK_INPROGRESS);
200 void kvm_make_scan_ioapic_request(struct kvm *kvm)
202 make_all_cpus_request(kvm, KVM_REQ_SCAN_IOAPIC);
205 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
210 mutex_init(&vcpu->mutex);
215 init_waitqueue_head(&vcpu->wq);
216 kvm_async_pf_vcpu_init(vcpu);
218 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
223 vcpu->run = page_address(page);
225 kvm_vcpu_set_in_spin_loop(vcpu, false);
226 kvm_vcpu_set_dy_eligible(vcpu, false);
227 vcpu->preempted = false;
229 r = kvm_arch_vcpu_init(vcpu);
235 free_page((unsigned long)vcpu->run);
239 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
241 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
244 kvm_arch_vcpu_uninit(vcpu);
245 free_page((unsigned long)vcpu->run);
247 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
249 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
250 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
252 return container_of(mn, struct kvm, mmu_notifier);
255 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
256 struct mm_struct *mm,
257 unsigned long address)
259 struct kvm *kvm = mmu_notifier_to_kvm(mn);
260 int need_tlb_flush, idx;
263 * When ->invalidate_page runs, the linux pte has been zapped
264 * already but the page is still allocated until
265 * ->invalidate_page returns. So if we increase the sequence
266 * here the kvm page fault will notice if the spte can't be
267 * established because the page is going to be freed. If
268 * instead the kvm page fault establishes the spte before
269 * ->invalidate_page runs, kvm_unmap_hva will release it
272 * The sequence increase only need to be seen at spin_unlock
273 * time, and not at spin_lock time.
275 * Increasing the sequence after the spin_unlock would be
276 * unsafe because the kvm page fault could then establish the
277 * pte after kvm_unmap_hva returned, without noticing the page
278 * is going to be freed.
280 idx = srcu_read_lock(&kvm->srcu);
281 spin_lock(&kvm->mmu_lock);
283 kvm->mmu_notifier_seq++;
284 need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty;
285 /* we've to flush the tlb before the pages can be freed */
287 kvm_flush_remote_tlbs(kvm);
289 spin_unlock(&kvm->mmu_lock);
290 srcu_read_unlock(&kvm->srcu, idx);
293 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
294 struct mm_struct *mm,
295 unsigned long address,
298 struct kvm *kvm = mmu_notifier_to_kvm(mn);
301 idx = srcu_read_lock(&kvm->srcu);
302 spin_lock(&kvm->mmu_lock);
303 kvm->mmu_notifier_seq++;
304 kvm_set_spte_hva(kvm, address, pte);
305 spin_unlock(&kvm->mmu_lock);
306 srcu_read_unlock(&kvm->srcu, idx);
309 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
310 struct mm_struct *mm,
314 struct kvm *kvm = mmu_notifier_to_kvm(mn);
315 int need_tlb_flush = 0, idx;
317 idx = srcu_read_lock(&kvm->srcu);
318 spin_lock(&kvm->mmu_lock);
320 * The count increase must become visible at unlock time as no
321 * spte can be established without taking the mmu_lock and
322 * count is also read inside the mmu_lock critical section.
324 kvm->mmu_notifier_count++;
325 need_tlb_flush = kvm_unmap_hva_range(kvm, start, end);
326 need_tlb_flush |= kvm->tlbs_dirty;
327 /* we've to flush the tlb before the pages can be freed */
329 kvm_flush_remote_tlbs(kvm);
331 spin_unlock(&kvm->mmu_lock);
332 srcu_read_unlock(&kvm->srcu, idx);
335 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
336 struct mm_struct *mm,
340 struct kvm *kvm = mmu_notifier_to_kvm(mn);
342 spin_lock(&kvm->mmu_lock);
344 * This sequence increase will notify the kvm page fault that
345 * the page that is going to be mapped in the spte could have
348 kvm->mmu_notifier_seq++;
351 * The above sequence increase must be visible before the
352 * below count decrease, which is ensured by the smp_wmb above
353 * in conjunction with the smp_rmb in mmu_notifier_retry().
355 kvm->mmu_notifier_count--;
356 spin_unlock(&kvm->mmu_lock);
358 BUG_ON(kvm->mmu_notifier_count < 0);
361 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
362 struct mm_struct *mm,
363 unsigned long address)
365 struct kvm *kvm = mmu_notifier_to_kvm(mn);
368 idx = srcu_read_lock(&kvm->srcu);
369 spin_lock(&kvm->mmu_lock);
371 young = kvm_age_hva(kvm, address);
373 kvm_flush_remote_tlbs(kvm);
375 spin_unlock(&kvm->mmu_lock);
376 srcu_read_unlock(&kvm->srcu, idx);
381 static int kvm_mmu_notifier_test_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);
390 young = kvm_test_age_hva(kvm, address);
391 spin_unlock(&kvm->mmu_lock);
392 srcu_read_unlock(&kvm->srcu, idx);
397 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
398 struct mm_struct *mm)
400 struct kvm *kvm = mmu_notifier_to_kvm(mn);
403 idx = srcu_read_lock(&kvm->srcu);
404 kvm_arch_flush_shadow_all(kvm);
405 srcu_read_unlock(&kvm->srcu, idx);
408 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
409 .invalidate_page = kvm_mmu_notifier_invalidate_page,
410 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
411 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
412 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
413 .test_young = kvm_mmu_notifier_test_young,
414 .change_pte = kvm_mmu_notifier_change_pte,
415 .release = kvm_mmu_notifier_release,
418 static int kvm_init_mmu_notifier(struct kvm *kvm)
420 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
421 return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
424 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
426 static int kvm_init_mmu_notifier(struct kvm *kvm)
431 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
433 static void kvm_init_memslots_id(struct kvm *kvm)
436 struct kvm_memslots *slots = kvm->memslots;
438 for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
439 slots->id_to_index[i] = slots->memslots[i].id = i;
442 static struct kvm *kvm_create_vm(unsigned long type)
445 struct kvm *kvm = kvm_arch_alloc_vm();
448 return ERR_PTR(-ENOMEM);
450 r = kvm_arch_init_vm(kvm, type);
452 goto out_err_nodisable;
454 r = hardware_enable_all();
456 goto out_err_nodisable;
458 #ifdef CONFIG_HAVE_KVM_IRQCHIP
459 INIT_HLIST_HEAD(&kvm->mask_notifier_list);
460 INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
463 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX);
466 kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
469 kvm_init_memslots_id(kvm);
470 if (init_srcu_struct(&kvm->srcu))
472 for (i = 0; i < KVM_NR_BUSES; i++) {
473 kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus),
479 spin_lock_init(&kvm->mmu_lock);
480 kvm->mm = current->mm;
481 atomic_inc(&kvm->mm->mm_count);
482 kvm_eventfd_init(kvm);
483 mutex_init(&kvm->lock);
484 mutex_init(&kvm->irq_lock);
485 mutex_init(&kvm->slots_lock);
486 atomic_set(&kvm->users_count, 1);
487 INIT_LIST_HEAD(&kvm->devices);
489 r = kvm_init_mmu_notifier(kvm);
493 raw_spin_lock(&kvm_lock);
494 list_add(&kvm->vm_list, &vm_list);
495 raw_spin_unlock(&kvm_lock);
500 cleanup_srcu_struct(&kvm->srcu);
502 hardware_disable_all();
504 for (i = 0; i < KVM_NR_BUSES; i++)
505 kfree(kvm->buses[i]);
506 kfree(kvm->memslots);
507 kvm_arch_free_vm(kvm);
512 * Avoid using vmalloc for a small buffer.
513 * Should not be used when the size is statically known.
515 void *kvm_kvzalloc(unsigned long size)
517 if (size > PAGE_SIZE)
518 return vzalloc(size);
520 return kzalloc(size, GFP_KERNEL);
523 void kvm_kvfree(const void *addr)
525 if (is_vmalloc_addr(addr))
531 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
533 if (!memslot->dirty_bitmap)
536 kvm_kvfree(memslot->dirty_bitmap);
537 memslot->dirty_bitmap = NULL;
541 * Free any memory in @free but not in @dont.
543 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
544 struct kvm_memory_slot *dont)
546 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
547 kvm_destroy_dirty_bitmap(free);
549 kvm_arch_free_memslot(free, dont);
554 void kvm_free_physmem(struct kvm *kvm)
556 struct kvm_memslots *slots = kvm->memslots;
557 struct kvm_memory_slot *memslot;
559 kvm_for_each_memslot(memslot, slots)
560 kvm_free_physmem_slot(memslot, NULL);
562 kfree(kvm->memslots);
565 static void kvm_destroy_devices(struct kvm *kvm)
567 struct list_head *node, *tmp;
569 list_for_each_safe(node, tmp, &kvm->devices) {
570 struct kvm_device *dev =
571 list_entry(node, struct kvm_device, vm_node);
574 dev->ops->destroy(dev);
578 static void kvm_destroy_vm(struct kvm *kvm)
581 struct mm_struct *mm = kvm->mm;
583 kvm_arch_sync_events(kvm);
584 raw_spin_lock(&kvm_lock);
585 list_del(&kvm->vm_list);
586 raw_spin_unlock(&kvm_lock);
587 kvm_free_irq_routing(kvm);
588 for (i = 0; i < KVM_NR_BUSES; i++)
589 kvm_io_bus_destroy(kvm->buses[i]);
590 kvm_coalesced_mmio_free(kvm);
591 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
592 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
594 kvm_arch_flush_shadow_all(kvm);
596 kvm_arch_destroy_vm(kvm);
597 kvm_destroy_devices(kvm);
598 kvm_free_physmem(kvm);
599 cleanup_srcu_struct(&kvm->srcu);
600 kvm_arch_free_vm(kvm);
601 hardware_disable_all();
605 void kvm_get_kvm(struct kvm *kvm)
607 atomic_inc(&kvm->users_count);
609 EXPORT_SYMBOL_GPL(kvm_get_kvm);
611 void kvm_put_kvm(struct kvm *kvm)
613 if (atomic_dec_and_test(&kvm->users_count))
616 EXPORT_SYMBOL_GPL(kvm_put_kvm);
619 static int kvm_vm_release(struct inode *inode, struct file *filp)
621 struct kvm *kvm = filp->private_data;
623 kvm_irqfd_release(kvm);
630 * Allocation size is twice as large as the actual dirty bitmap size.
631 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
633 static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
636 unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
638 memslot->dirty_bitmap = kvm_kvzalloc(dirty_bytes);
639 if (!memslot->dirty_bitmap)
642 #endif /* !CONFIG_S390 */
646 static int cmp_memslot(const void *slot1, const void *slot2)
648 struct kvm_memory_slot *s1, *s2;
650 s1 = (struct kvm_memory_slot *)slot1;
651 s2 = (struct kvm_memory_slot *)slot2;
653 if (s1->npages < s2->npages)
655 if (s1->npages > s2->npages)
662 * Sort the memslots base on its size, so the larger slots
663 * will get better fit.
665 static void sort_memslots(struct kvm_memslots *slots)
669 sort(slots->memslots, KVM_MEM_SLOTS_NUM,
670 sizeof(struct kvm_memory_slot), cmp_memslot, NULL);
672 for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
673 slots->id_to_index[slots->memslots[i].id] = i;
676 void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new,
681 struct kvm_memory_slot *old = id_to_memslot(slots, id);
682 unsigned long npages = old->npages;
685 if (new->npages != npages)
686 sort_memslots(slots);
689 slots->generation = last_generation + 1;
692 static int check_memory_region_flags(struct kvm_userspace_memory_region *mem)
694 u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES;
696 #ifdef KVM_CAP_READONLY_MEM
697 valid_flags |= KVM_MEM_READONLY;
700 if (mem->flags & ~valid_flags)
706 static struct kvm_memslots *install_new_memslots(struct kvm *kvm,
707 struct kvm_memslots *slots, struct kvm_memory_slot *new)
709 struct kvm_memslots *old_memslots = kvm->memslots;
711 update_memslots(slots, new, kvm->memslots->generation);
712 rcu_assign_pointer(kvm->memslots, slots);
713 synchronize_srcu_expedited(&kvm->srcu);
715 kvm_arch_memslots_updated(kvm);
721 * Allocate some memory and give it an address in the guest physical address
724 * Discontiguous memory is allowed, mostly for framebuffers.
726 * Must be called holding mmap_sem for write.
728 int __kvm_set_memory_region(struct kvm *kvm,
729 struct kvm_userspace_memory_region *mem)
733 unsigned long npages;
734 struct kvm_memory_slot *slot;
735 struct kvm_memory_slot old, new;
736 struct kvm_memslots *slots = NULL, *old_memslots;
737 enum kvm_mr_change change;
739 r = check_memory_region_flags(mem);
744 /* General sanity checks */
745 if (mem->memory_size & (PAGE_SIZE - 1))
747 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
749 /* We can read the guest memory with __xxx_user() later on. */
750 if ((mem->slot < KVM_USER_MEM_SLOTS) &&
751 ((mem->userspace_addr & (PAGE_SIZE - 1)) ||
752 !access_ok(VERIFY_WRITE,
753 (void __user *)(unsigned long)mem->userspace_addr,
756 if (mem->slot >= KVM_MEM_SLOTS_NUM)
758 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
761 slot = id_to_memslot(kvm->memslots, mem->slot);
762 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
763 npages = mem->memory_size >> PAGE_SHIFT;
766 if (npages > KVM_MEM_MAX_NR_PAGES)
770 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
775 new.base_gfn = base_gfn;
777 new.flags = mem->flags;
782 change = KVM_MR_CREATE;
783 else { /* Modify an existing slot. */
784 if ((mem->userspace_addr != old.userspace_addr) ||
785 (npages != old.npages) ||
786 ((new.flags ^ old.flags) & KVM_MEM_READONLY))
789 if (base_gfn != old.base_gfn)
790 change = KVM_MR_MOVE;
791 else if (new.flags != old.flags)
792 change = KVM_MR_FLAGS_ONLY;
793 else { /* Nothing to change. */
798 } else if (old.npages) {
799 change = KVM_MR_DELETE;
800 } else /* Modify a non-existent slot: disallowed. */
803 if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
804 /* Check for overlaps */
806 kvm_for_each_memslot(slot, kvm->memslots) {
807 if ((slot->id >= KVM_USER_MEM_SLOTS) ||
808 (slot->id == mem->slot))
810 if (!((base_gfn + npages <= slot->base_gfn) ||
811 (base_gfn >= slot->base_gfn + slot->npages)))
816 /* Free page dirty bitmap if unneeded */
817 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
818 new.dirty_bitmap = NULL;
821 if (change == KVM_MR_CREATE) {
822 new.userspace_addr = mem->userspace_addr;
824 if (kvm_arch_create_memslot(&new, npages))
828 /* Allocate page dirty bitmap if needed */
829 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
830 if (kvm_create_dirty_bitmap(&new) < 0)
834 if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) {
836 slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots),
840 slot = id_to_memslot(slots, mem->slot);
841 slot->flags |= KVM_MEMSLOT_INVALID;
843 old_memslots = install_new_memslots(kvm, slots, NULL);
845 /* slot was deleted or moved, clear iommu mapping */
846 kvm_iommu_unmap_pages(kvm, &old);
847 /* From this point no new shadow pages pointing to a deleted,
848 * or moved, memslot will be created.
850 * validation of sp->gfn happens in:
851 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
852 * - kvm_is_visible_gfn (mmu_check_roots)
854 kvm_arch_flush_shadow_memslot(kvm, slot);
855 slots = old_memslots;
858 r = kvm_arch_prepare_memory_region(kvm, &new, mem, change);
864 * We can re-use the old_memslots from above, the only difference
865 * from the currently installed memslots is the invalid flag. This
866 * will get overwritten by update_memslots anyway.
869 slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots),
876 * IOMMU mapping: New slots need to be mapped. Old slots need to be
877 * un-mapped and re-mapped if their base changes. Since base change
878 * unmapping is handled above with slot deletion, mapping alone is
879 * needed here. Anything else the iommu might care about for existing
880 * slots (size changes, userspace addr changes and read-only flag
881 * changes) is disallowed above, so any other attribute changes getting
882 * here can be skipped.
884 if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
885 r = kvm_iommu_map_pages(kvm, &new);
890 /* actual memory is freed via old in kvm_free_physmem_slot below */
891 if (change == KVM_MR_DELETE) {
892 new.dirty_bitmap = NULL;
893 memset(&new.arch, 0, sizeof(new.arch));
896 old_memslots = install_new_memslots(kvm, slots, &new);
898 kvm_arch_commit_memory_region(kvm, mem, &old, change);
900 kvm_free_physmem_slot(&old, &new);
908 kvm_free_physmem_slot(&new, &old);
912 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
914 int kvm_set_memory_region(struct kvm *kvm,
915 struct kvm_userspace_memory_region *mem)
919 mutex_lock(&kvm->slots_lock);
920 r = __kvm_set_memory_region(kvm, mem);
921 mutex_unlock(&kvm->slots_lock);
924 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
926 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
927 struct kvm_userspace_memory_region *mem)
929 if (mem->slot >= KVM_USER_MEM_SLOTS)
931 return kvm_set_memory_region(kvm, mem);
934 int kvm_get_dirty_log(struct kvm *kvm,
935 struct kvm_dirty_log *log, int *is_dirty)
937 struct kvm_memory_slot *memslot;
940 unsigned long any = 0;
943 if (log->slot >= KVM_USER_MEM_SLOTS)
946 memslot = id_to_memslot(kvm->memslots, log->slot);
948 if (!memslot->dirty_bitmap)
951 n = kvm_dirty_bitmap_bytes(memslot);
953 for (i = 0; !any && i < n/sizeof(long); ++i)
954 any = memslot->dirty_bitmap[i];
957 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
968 bool kvm_largepages_enabled(void)
970 return largepages_enabled;
973 void kvm_disable_largepages(void)
975 largepages_enabled = false;
977 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
979 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
981 return __gfn_to_memslot(kvm_memslots(kvm), gfn);
983 EXPORT_SYMBOL_GPL(gfn_to_memslot);
985 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
987 struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn);
989 if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS ||
990 memslot->flags & KVM_MEMSLOT_INVALID)
995 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
997 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
999 struct vm_area_struct *vma;
1000 unsigned long addr, size;
1004 addr = gfn_to_hva(kvm, gfn);
1005 if (kvm_is_error_hva(addr))
1008 down_read(¤t->mm->mmap_sem);
1009 vma = find_vma(current->mm, addr);
1013 size = vma_kernel_pagesize(vma);
1016 up_read(¤t->mm->mmap_sem);
1021 static bool memslot_is_readonly(struct kvm_memory_slot *slot)
1023 return slot->flags & KVM_MEM_READONLY;
1026 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1027 gfn_t *nr_pages, bool write)
1029 if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
1030 return KVM_HVA_ERR_BAD;
1032 if (memslot_is_readonly(slot) && write)
1033 return KVM_HVA_ERR_RO_BAD;
1036 *nr_pages = slot->npages - (gfn - slot->base_gfn);
1038 return __gfn_to_hva_memslot(slot, gfn);
1041 static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1044 return __gfn_to_hva_many(slot, gfn, nr_pages, true);
1047 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot,
1050 return gfn_to_hva_many(slot, gfn, NULL);
1052 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot);
1054 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1056 return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
1058 EXPORT_SYMBOL_GPL(gfn_to_hva);
1061 * If writable is set to false, the hva returned by this function is only
1062 * allowed to be read.
1064 unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable)
1066 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1068 *writable = !memslot_is_readonly(slot);
1070 return __gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL, false);
1073 static int kvm_read_hva(void *data, void __user *hva, int len)
1075 return __copy_from_user(data, hva, len);
1078 static int kvm_read_hva_atomic(void *data, void __user *hva, int len)
1080 return __copy_from_user_inatomic(data, hva, len);
1083 static int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm,
1084 unsigned long start, int write, struct page **page)
1086 int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET;
1089 flags |= FOLL_WRITE;
1091 return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL);
1094 static inline int check_user_page_hwpoison(unsigned long addr)
1096 int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE;
1098 rc = __get_user_pages(current, current->mm, addr, 1,
1099 flags, NULL, NULL, NULL);
1100 return rc == -EHWPOISON;
1104 * The atomic path to get the writable pfn which will be stored in @pfn,
1105 * true indicates success, otherwise false is returned.
1107 static bool hva_to_pfn_fast(unsigned long addr, bool atomic, bool *async,
1108 bool write_fault, bool *writable, pfn_t *pfn)
1110 struct page *page[1];
1113 if (!(async || atomic))
1117 * Fast pin a writable pfn only if it is a write fault request
1118 * or the caller allows to map a writable pfn for a read fault
1121 if (!(write_fault || writable))
1124 npages = __get_user_pages_fast(addr, 1, 1, page);
1126 *pfn = page_to_pfn(page[0]);
1137 * The slow path to get the pfn of the specified host virtual address,
1138 * 1 indicates success, -errno is returned if error is detected.
1140 static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault,
1141 bool *writable, pfn_t *pfn)
1143 struct page *page[1];
1149 *writable = write_fault;
1152 down_read(¤t->mm->mmap_sem);
1153 npages = get_user_page_nowait(current, current->mm,
1154 addr, write_fault, page);
1155 up_read(¤t->mm->mmap_sem);
1157 npages = get_user_pages_fast(addr, 1, write_fault,
1162 /* map read fault as writable if possible */
1163 if (unlikely(!write_fault) && writable) {
1164 struct page *wpage[1];
1166 npages = __get_user_pages_fast(addr, 1, 1, wpage);
1175 *pfn = page_to_pfn(page[0]);
1179 static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault)
1181 if (unlikely(!(vma->vm_flags & VM_READ)))
1184 if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE))))
1191 * Pin guest page in memory and return its pfn.
1192 * @addr: host virtual address which maps memory to the guest
1193 * @atomic: whether this function can sleep
1194 * @async: whether this function need to wait IO complete if the
1195 * host page is not in the memory
1196 * @write_fault: whether we should get a writable host page
1197 * @writable: whether it allows to map a writable host page for !@write_fault
1199 * The function will map a writable host page for these two cases:
1200 * 1): @write_fault = true
1201 * 2): @write_fault = false && @writable, @writable will tell the caller
1202 * whether the mapping is writable.
1204 static pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async,
1205 bool write_fault, bool *writable)
1207 struct vm_area_struct *vma;
1211 /* we can do it either atomically or asynchronously, not both */
1212 BUG_ON(atomic && async);
1214 if (hva_to_pfn_fast(addr, atomic, async, write_fault, writable, &pfn))
1218 return KVM_PFN_ERR_FAULT;
1220 npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn);
1224 down_read(¤t->mm->mmap_sem);
1225 if (npages == -EHWPOISON ||
1226 (!async && check_user_page_hwpoison(addr))) {
1227 pfn = KVM_PFN_ERR_HWPOISON;
1231 vma = find_vma_intersection(current->mm, addr, addr + 1);
1234 pfn = KVM_PFN_ERR_FAULT;
1235 else if ((vma->vm_flags & VM_PFNMAP)) {
1236 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) +
1238 BUG_ON(!kvm_is_mmio_pfn(pfn));
1240 if (async && vma_is_valid(vma, write_fault))
1242 pfn = KVM_PFN_ERR_FAULT;
1245 up_read(¤t->mm->mmap_sem);
1250 __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn, bool atomic,
1251 bool *async, bool write_fault, bool *writable)
1253 unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault);
1255 if (addr == KVM_HVA_ERR_RO_BAD)
1256 return KVM_PFN_ERR_RO_FAULT;
1258 if (kvm_is_error_hva(addr))
1259 return KVM_PFN_NOSLOT;
1261 /* Do not map writable pfn in the readonly memslot. */
1262 if (writable && memslot_is_readonly(slot)) {
1267 return hva_to_pfn(addr, atomic, async, write_fault,
1271 static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async,
1272 bool write_fault, bool *writable)
1274 struct kvm_memory_slot *slot;
1279 slot = gfn_to_memslot(kvm, gfn);
1281 return __gfn_to_pfn_memslot(slot, gfn, atomic, async, write_fault,
1285 pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
1287 return __gfn_to_pfn(kvm, gfn, true, NULL, true, NULL);
1289 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
1291 pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async,
1292 bool write_fault, bool *writable)
1294 return __gfn_to_pfn(kvm, gfn, false, async, write_fault, writable);
1296 EXPORT_SYMBOL_GPL(gfn_to_pfn_async);
1298 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1300 return __gfn_to_pfn(kvm, gfn, false, NULL, true, NULL);
1302 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1304 pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1307 return __gfn_to_pfn(kvm, gfn, false, NULL, write_fault, writable);
1309 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
1311 pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
1313 return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL);
1316 pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn)
1318 return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL);
1320 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic);
1322 int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
1328 addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry);
1329 if (kvm_is_error_hva(addr))
1332 if (entry < nr_pages)
1335 return __get_user_pages_fast(addr, nr_pages, 1, pages);
1337 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
1339 static struct page *kvm_pfn_to_page(pfn_t pfn)
1341 if (is_error_noslot_pfn(pfn))
1342 return KVM_ERR_PTR_BAD_PAGE;
1344 if (kvm_is_mmio_pfn(pfn)) {
1346 return KVM_ERR_PTR_BAD_PAGE;
1349 return pfn_to_page(pfn);
1352 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1356 pfn = gfn_to_pfn(kvm, gfn);
1358 return kvm_pfn_to_page(pfn);
1361 EXPORT_SYMBOL_GPL(gfn_to_page);
1363 void kvm_release_page_clean(struct page *page)
1365 WARN_ON(is_error_page(page));
1367 kvm_release_pfn_clean(page_to_pfn(page));
1369 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1371 void kvm_release_pfn_clean(pfn_t pfn)
1373 if (!is_error_noslot_pfn(pfn) && !kvm_is_mmio_pfn(pfn))
1374 put_page(pfn_to_page(pfn));
1376 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1378 void kvm_release_page_dirty(struct page *page)
1380 WARN_ON(is_error_page(page));
1382 kvm_release_pfn_dirty(page_to_pfn(page));
1384 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1386 void kvm_release_pfn_dirty(pfn_t pfn)
1388 kvm_set_pfn_dirty(pfn);
1389 kvm_release_pfn_clean(pfn);
1391 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1393 void kvm_set_page_dirty(struct page *page)
1395 kvm_set_pfn_dirty(page_to_pfn(page));
1397 EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
1399 void kvm_set_pfn_dirty(pfn_t pfn)
1401 if (!kvm_is_mmio_pfn(pfn)) {
1402 struct page *page = pfn_to_page(pfn);
1403 if (!PageReserved(page))
1407 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1409 void kvm_set_pfn_accessed(pfn_t pfn)
1411 if (!kvm_is_mmio_pfn(pfn))
1412 mark_page_accessed(pfn_to_page(pfn));
1414 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1416 void kvm_get_pfn(pfn_t pfn)
1418 if (!kvm_is_mmio_pfn(pfn))
1419 get_page(pfn_to_page(pfn));
1421 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1423 static int next_segment(unsigned long len, int offset)
1425 if (len > PAGE_SIZE - offset)
1426 return PAGE_SIZE - offset;
1431 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1437 addr = gfn_to_hva_prot(kvm, gfn, NULL);
1438 if (kvm_is_error_hva(addr))
1440 r = kvm_read_hva(data, (void __user *)addr + offset, len);
1445 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1447 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1449 gfn_t gfn = gpa >> PAGE_SHIFT;
1451 int offset = offset_in_page(gpa);
1454 while ((seg = next_segment(len, offset)) != 0) {
1455 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1465 EXPORT_SYMBOL_GPL(kvm_read_guest);
1467 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1472 gfn_t gfn = gpa >> PAGE_SHIFT;
1473 int offset = offset_in_page(gpa);
1475 addr = gfn_to_hva_prot(kvm, gfn, NULL);
1476 if (kvm_is_error_hva(addr))
1478 pagefault_disable();
1479 r = kvm_read_hva_atomic(data, (void __user *)addr + offset, len);
1485 EXPORT_SYMBOL(kvm_read_guest_atomic);
1487 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1488 int offset, int len)
1493 addr = gfn_to_hva(kvm, gfn);
1494 if (kvm_is_error_hva(addr))
1496 r = __copy_to_user((void __user *)addr + offset, data, len);
1499 mark_page_dirty(kvm, gfn);
1502 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1504 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1507 gfn_t gfn = gpa >> PAGE_SHIFT;
1509 int offset = offset_in_page(gpa);
1512 while ((seg = next_segment(len, offset)) != 0) {
1513 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1524 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1525 gpa_t gpa, unsigned long len)
1527 struct kvm_memslots *slots = kvm_memslots(kvm);
1528 int offset = offset_in_page(gpa);
1529 gfn_t start_gfn = gpa >> PAGE_SHIFT;
1530 gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT;
1531 gfn_t nr_pages_needed = end_gfn - start_gfn + 1;
1532 gfn_t nr_pages_avail;
1535 ghc->generation = slots->generation;
1537 ghc->memslot = gfn_to_memslot(kvm, start_gfn);
1538 ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, &nr_pages_avail);
1539 if (!kvm_is_error_hva(ghc->hva) && nr_pages_avail >= nr_pages_needed) {
1543 * If the requested region crosses two memslots, we still
1544 * verify that the entire region is valid here.
1546 while (start_gfn <= end_gfn) {
1547 ghc->memslot = gfn_to_memslot(kvm, start_gfn);
1548 ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn,
1550 if (kvm_is_error_hva(ghc->hva))
1552 start_gfn += nr_pages_avail;
1554 /* Use the slow path for cross page reads and writes. */
1555 ghc->memslot = NULL;
1559 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
1561 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1562 void *data, unsigned long len)
1564 struct kvm_memslots *slots = kvm_memslots(kvm);
1567 BUG_ON(len > ghc->len);
1569 if (slots->generation != ghc->generation)
1570 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len);
1572 if (unlikely(!ghc->memslot))
1573 return kvm_write_guest(kvm, ghc->gpa, data, len);
1575 if (kvm_is_error_hva(ghc->hva))
1578 r = __copy_to_user((void __user *)ghc->hva, data, len);
1581 mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT);
1585 EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
1587 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1588 void *data, unsigned long len)
1590 struct kvm_memslots *slots = kvm_memslots(kvm);
1593 BUG_ON(len > ghc->len);
1595 if (slots->generation != ghc->generation)
1596 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len);
1598 if (unlikely(!ghc->memslot))
1599 return kvm_read_guest(kvm, ghc->gpa, data, len);
1601 if (kvm_is_error_hva(ghc->hva))
1604 r = __copy_from_user(data, (void __user *)ghc->hva, len);
1610 EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
1612 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1614 return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page,
1617 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1619 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1621 gfn_t gfn = gpa >> PAGE_SHIFT;
1623 int offset = offset_in_page(gpa);
1626 while ((seg = next_segment(len, offset)) != 0) {
1627 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1636 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1638 void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot,
1641 if (memslot && memslot->dirty_bitmap) {
1642 unsigned long rel_gfn = gfn - memslot->base_gfn;
1644 set_bit_le(rel_gfn, memslot->dirty_bitmap);
1648 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1650 struct kvm_memory_slot *memslot;
1652 memslot = gfn_to_memslot(kvm, gfn);
1653 mark_page_dirty_in_slot(kvm, memslot, gfn);
1657 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1659 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1664 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1666 if (kvm_arch_vcpu_runnable(vcpu)) {
1667 kvm_make_request(KVM_REQ_UNHALT, vcpu);
1670 if (kvm_cpu_has_pending_timer(vcpu))
1672 if (signal_pending(current))
1678 finish_wait(&vcpu->wq, &wait);
1683 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
1685 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
1688 int cpu = vcpu->cpu;
1689 wait_queue_head_t *wqp;
1691 wqp = kvm_arch_vcpu_wq(vcpu);
1692 if (waitqueue_active(wqp)) {
1693 wake_up_interruptible(wqp);
1694 ++vcpu->stat.halt_wakeup;
1698 if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
1699 if (kvm_arch_vcpu_should_kick(vcpu))
1700 smp_send_reschedule(cpu);
1703 EXPORT_SYMBOL_GPL(kvm_vcpu_kick);
1704 #endif /* !CONFIG_S390 */
1706 void kvm_resched(struct kvm_vcpu *vcpu)
1708 if (!need_resched())
1712 EXPORT_SYMBOL_GPL(kvm_resched);
1714 bool kvm_vcpu_yield_to(struct kvm_vcpu *target)
1717 struct task_struct *task = NULL;
1721 pid = rcu_dereference(target->pid);
1723 task = get_pid_task(target->pid, PIDTYPE_PID);
1727 if (task->flags & PF_VCPU) {
1728 put_task_struct(task);
1731 ret = yield_to(task, 1);
1732 put_task_struct(task);
1736 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to);
1738 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
1740 * Helper that checks whether a VCPU is eligible for directed yield.
1741 * Most eligible candidate to yield is decided by following heuristics:
1743 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
1744 * (preempted lock holder), indicated by @in_spin_loop.
1745 * Set at the beiginning and cleared at the end of interception/PLE handler.
1747 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
1748 * chance last time (mostly it has become eligible now since we have probably
1749 * yielded to lockholder in last iteration. This is done by toggling
1750 * @dy_eligible each time a VCPU checked for eligibility.)
1752 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
1753 * to preempted lock-holder could result in wrong VCPU selection and CPU
1754 * burning. Giving priority for a potential lock-holder increases lock
1757 * Since algorithm is based on heuristics, accessing another VCPU data without
1758 * locking does not harm. It may result in trying to yield to same VCPU, fail
1759 * and continue with next VCPU and so on.
1761 bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu)
1765 eligible = !vcpu->spin_loop.in_spin_loop ||
1766 (vcpu->spin_loop.in_spin_loop &&
1767 vcpu->spin_loop.dy_eligible);
1769 if (vcpu->spin_loop.in_spin_loop)
1770 kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible);
1776 void kvm_vcpu_on_spin(struct kvm_vcpu *me)
1778 struct kvm *kvm = me->kvm;
1779 struct kvm_vcpu *vcpu;
1780 int last_boosted_vcpu = me->kvm->last_boosted_vcpu;
1786 kvm_vcpu_set_in_spin_loop(me, true);
1788 * We boost the priority of a VCPU that is runnable but not
1789 * currently running, because it got preempted by something
1790 * else and called schedule in __vcpu_run. Hopefully that
1791 * VCPU is holding the lock that we need and will release it.
1792 * We approximate round-robin by starting at the last boosted VCPU.
1794 for (pass = 0; pass < 2 && !yielded && try; pass++) {
1795 kvm_for_each_vcpu(i, vcpu, kvm) {
1796 if (!pass && i <= last_boosted_vcpu) {
1797 i = last_boosted_vcpu;
1799 } else if (pass && i > last_boosted_vcpu)
1801 if (!ACCESS_ONCE(vcpu->preempted))
1805 if (waitqueue_active(&vcpu->wq))
1807 if (!kvm_vcpu_eligible_for_directed_yield(vcpu))
1810 yielded = kvm_vcpu_yield_to(vcpu);
1812 kvm->last_boosted_vcpu = i;
1814 } else if (yielded < 0) {
1821 kvm_vcpu_set_in_spin_loop(me, false);
1823 /* Ensure vcpu is not eligible during next spinloop */
1824 kvm_vcpu_set_dy_eligible(me, false);
1826 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
1828 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1830 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1833 if (vmf->pgoff == 0)
1834 page = virt_to_page(vcpu->run);
1836 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
1837 page = virt_to_page(vcpu->arch.pio_data);
1839 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1840 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1841 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1844 return kvm_arch_vcpu_fault(vcpu, vmf);
1850 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
1851 .fault = kvm_vcpu_fault,
1854 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1856 vma->vm_ops = &kvm_vcpu_vm_ops;
1860 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1862 struct kvm_vcpu *vcpu = filp->private_data;
1864 kvm_put_kvm(vcpu->kvm);
1868 static struct file_operations kvm_vcpu_fops = {
1869 .release = kvm_vcpu_release,
1870 .unlocked_ioctl = kvm_vcpu_ioctl,
1871 #ifdef CONFIG_COMPAT
1872 .compat_ioctl = kvm_vcpu_compat_ioctl,
1874 .mmap = kvm_vcpu_mmap,
1875 .llseek = noop_llseek,
1879 * Allocates an inode for the vcpu.
1881 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1883 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC);
1887 * Creates some virtual cpus. Good luck creating more than one.
1889 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
1892 struct kvm_vcpu *vcpu, *v;
1894 vcpu = kvm_arch_vcpu_create(kvm, id);
1896 return PTR_ERR(vcpu);
1898 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1900 r = kvm_arch_vcpu_setup(vcpu);
1904 mutex_lock(&kvm->lock);
1905 if (!kvm_vcpu_compatible(vcpu)) {
1907 goto unlock_vcpu_destroy;
1909 if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
1911 goto unlock_vcpu_destroy;
1914 kvm_for_each_vcpu(r, v, kvm)
1915 if (v->vcpu_id == id) {
1917 goto unlock_vcpu_destroy;
1920 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
1922 /* Now it's all set up, let userspace reach it */
1924 r = create_vcpu_fd(vcpu);
1927 goto unlock_vcpu_destroy;
1930 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
1932 atomic_inc(&kvm->online_vcpus);
1934 mutex_unlock(&kvm->lock);
1935 kvm_arch_vcpu_postcreate(vcpu);
1938 unlock_vcpu_destroy:
1939 mutex_unlock(&kvm->lock);
1941 kvm_arch_vcpu_destroy(vcpu);
1945 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1948 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1949 vcpu->sigset_active = 1;
1950 vcpu->sigset = *sigset;
1952 vcpu->sigset_active = 0;
1956 static long kvm_vcpu_ioctl(struct file *filp,
1957 unsigned int ioctl, unsigned long arg)
1959 struct kvm_vcpu *vcpu = filp->private_data;
1960 void __user *argp = (void __user *)arg;
1962 struct kvm_fpu *fpu = NULL;
1963 struct kvm_sregs *kvm_sregs = NULL;
1965 if (vcpu->kvm->mm != current->mm)
1968 #if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS)
1970 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1971 * so vcpu_load() would break it.
1973 if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT)
1974 return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1978 r = vcpu_load(vcpu);
1986 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
1987 trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
1989 case KVM_GET_REGS: {
1990 struct kvm_regs *kvm_regs;
1993 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1996 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
2000 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
2007 case KVM_SET_REGS: {
2008 struct kvm_regs *kvm_regs;
2011 kvm_regs = memdup_user(argp, sizeof(*kvm_regs));
2012 if (IS_ERR(kvm_regs)) {
2013 r = PTR_ERR(kvm_regs);
2016 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
2020 case KVM_GET_SREGS: {
2021 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
2025 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
2029 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
2034 case KVM_SET_SREGS: {
2035 kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs));
2036 if (IS_ERR(kvm_sregs)) {
2037 r = PTR_ERR(kvm_sregs);
2041 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
2044 case KVM_GET_MP_STATE: {
2045 struct kvm_mp_state mp_state;
2047 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
2051 if (copy_to_user(argp, &mp_state, sizeof mp_state))
2056 case KVM_SET_MP_STATE: {
2057 struct kvm_mp_state mp_state;
2060 if (copy_from_user(&mp_state, argp, sizeof mp_state))
2062 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
2065 case KVM_TRANSLATE: {
2066 struct kvm_translation tr;
2069 if (copy_from_user(&tr, argp, sizeof tr))
2071 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
2075 if (copy_to_user(argp, &tr, sizeof tr))
2080 case KVM_SET_GUEST_DEBUG: {
2081 struct kvm_guest_debug dbg;
2084 if (copy_from_user(&dbg, argp, sizeof dbg))
2086 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
2089 case KVM_SET_SIGNAL_MASK: {
2090 struct kvm_signal_mask __user *sigmask_arg = argp;
2091 struct kvm_signal_mask kvm_sigmask;
2092 sigset_t sigset, *p;
2097 if (copy_from_user(&kvm_sigmask, argp,
2098 sizeof kvm_sigmask))
2101 if (kvm_sigmask.len != sizeof sigset)
2104 if (copy_from_user(&sigset, sigmask_arg->sigset,
2109 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
2113 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
2117 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
2121 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
2127 fpu = memdup_user(argp, sizeof(*fpu));
2133 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
2137 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
2146 #ifdef CONFIG_COMPAT
2147 static long kvm_vcpu_compat_ioctl(struct file *filp,
2148 unsigned int ioctl, unsigned long arg)
2150 struct kvm_vcpu *vcpu = filp->private_data;
2151 void __user *argp = compat_ptr(arg);
2154 if (vcpu->kvm->mm != current->mm)
2158 case KVM_SET_SIGNAL_MASK: {
2159 struct kvm_signal_mask __user *sigmask_arg = argp;
2160 struct kvm_signal_mask kvm_sigmask;
2161 compat_sigset_t csigset;
2166 if (copy_from_user(&kvm_sigmask, argp,
2167 sizeof kvm_sigmask))
2170 if (kvm_sigmask.len != sizeof csigset)
2173 if (copy_from_user(&csigset, sigmask_arg->sigset,
2176 sigset_from_compat(&sigset, &csigset);
2177 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2179 r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL);
2183 r = kvm_vcpu_ioctl(filp, ioctl, arg);
2191 static int kvm_device_ioctl_attr(struct kvm_device *dev,
2192 int (*accessor)(struct kvm_device *dev,
2193 struct kvm_device_attr *attr),
2196 struct kvm_device_attr attr;
2201 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
2204 return accessor(dev, &attr);
2207 static long kvm_device_ioctl(struct file *filp, unsigned int ioctl,
2210 struct kvm_device *dev = filp->private_data;
2213 case KVM_SET_DEVICE_ATTR:
2214 return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg);
2215 case KVM_GET_DEVICE_ATTR:
2216 return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg);
2217 case KVM_HAS_DEVICE_ATTR:
2218 return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg);
2220 if (dev->ops->ioctl)
2221 return dev->ops->ioctl(dev, ioctl, arg);
2227 static int kvm_device_release(struct inode *inode, struct file *filp)
2229 struct kvm_device *dev = filp->private_data;
2230 struct kvm *kvm = dev->kvm;
2236 static const struct file_operations kvm_device_fops = {
2237 .unlocked_ioctl = kvm_device_ioctl,
2238 #ifdef CONFIG_COMPAT
2239 .compat_ioctl = kvm_device_ioctl,
2241 .release = kvm_device_release,
2244 struct kvm_device *kvm_device_from_filp(struct file *filp)
2246 if (filp->f_op != &kvm_device_fops)
2249 return filp->private_data;
2252 static int kvm_ioctl_create_device(struct kvm *kvm,
2253 struct kvm_create_device *cd)
2255 struct kvm_device_ops *ops = NULL;
2256 struct kvm_device *dev;
2257 bool test = cd->flags & KVM_CREATE_DEVICE_TEST;
2261 #ifdef CONFIG_KVM_MPIC
2262 case KVM_DEV_TYPE_FSL_MPIC_20:
2263 case KVM_DEV_TYPE_FSL_MPIC_42:
2264 ops = &kvm_mpic_ops;
2267 #ifdef CONFIG_KVM_XICS
2268 case KVM_DEV_TYPE_XICS:
2269 ops = &kvm_xics_ops;
2279 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2286 ret = ops->create(dev, cd->type);
2292 ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR | O_CLOEXEC);
2298 list_add(&dev->vm_node, &kvm->devices);
2304 static long kvm_vm_ioctl(struct file *filp,
2305 unsigned int ioctl, unsigned long arg)
2307 struct kvm *kvm = filp->private_data;
2308 void __user *argp = (void __user *)arg;
2311 if (kvm->mm != current->mm)
2314 case KVM_CREATE_VCPU:
2315 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2317 case KVM_SET_USER_MEMORY_REGION: {
2318 struct kvm_userspace_memory_region kvm_userspace_mem;
2321 if (copy_from_user(&kvm_userspace_mem, argp,
2322 sizeof kvm_userspace_mem))
2325 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem);
2328 case KVM_GET_DIRTY_LOG: {
2329 struct kvm_dirty_log log;
2332 if (copy_from_user(&log, argp, sizeof log))
2334 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2337 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2338 case KVM_REGISTER_COALESCED_MMIO: {
2339 struct kvm_coalesced_mmio_zone zone;
2341 if (copy_from_user(&zone, argp, sizeof zone))
2343 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
2346 case KVM_UNREGISTER_COALESCED_MMIO: {
2347 struct kvm_coalesced_mmio_zone zone;
2349 if (copy_from_user(&zone, argp, sizeof zone))
2351 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
2356 struct kvm_irqfd data;
2359 if (copy_from_user(&data, argp, sizeof data))
2361 r = kvm_irqfd(kvm, &data);
2364 case KVM_IOEVENTFD: {
2365 struct kvm_ioeventfd data;
2368 if (copy_from_user(&data, argp, sizeof data))
2370 r = kvm_ioeventfd(kvm, &data);
2373 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2374 case KVM_SET_BOOT_CPU_ID:
2376 mutex_lock(&kvm->lock);
2377 if (atomic_read(&kvm->online_vcpus) != 0)
2380 kvm->bsp_vcpu_id = arg;
2381 mutex_unlock(&kvm->lock);
2384 #ifdef CONFIG_HAVE_KVM_MSI
2385 case KVM_SIGNAL_MSI: {
2389 if (copy_from_user(&msi, argp, sizeof msi))
2391 r = kvm_send_userspace_msi(kvm, &msi);
2395 #ifdef __KVM_HAVE_IRQ_LINE
2396 case KVM_IRQ_LINE_STATUS:
2397 case KVM_IRQ_LINE: {
2398 struct kvm_irq_level irq_event;
2401 if (copy_from_user(&irq_event, argp, sizeof irq_event))
2404 r = kvm_vm_ioctl_irq_line(kvm, &irq_event,
2405 ioctl == KVM_IRQ_LINE_STATUS);
2410 if (ioctl == KVM_IRQ_LINE_STATUS) {
2411 if (copy_to_user(argp, &irq_event, sizeof irq_event))
2419 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2420 case KVM_SET_GSI_ROUTING: {
2421 struct kvm_irq_routing routing;
2422 struct kvm_irq_routing __user *urouting;
2423 struct kvm_irq_routing_entry *entries;
2426 if (copy_from_user(&routing, argp, sizeof(routing)))
2429 if (routing.nr >= KVM_MAX_IRQ_ROUTES)
2434 entries = vmalloc(routing.nr * sizeof(*entries));
2439 if (copy_from_user(entries, urouting->entries,
2440 routing.nr * sizeof(*entries)))
2441 goto out_free_irq_routing;
2442 r = kvm_set_irq_routing(kvm, entries, routing.nr,
2444 out_free_irq_routing:
2448 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
2449 case KVM_CREATE_DEVICE: {
2450 struct kvm_create_device cd;
2453 if (copy_from_user(&cd, argp, sizeof(cd)))
2456 r = kvm_ioctl_create_device(kvm, &cd);
2461 if (copy_to_user(argp, &cd, sizeof(cd)))
2468 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
2470 r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
2476 #ifdef CONFIG_COMPAT
2477 struct compat_kvm_dirty_log {
2481 compat_uptr_t dirty_bitmap; /* one bit per page */
2486 static long kvm_vm_compat_ioctl(struct file *filp,
2487 unsigned int ioctl, unsigned long arg)
2489 struct kvm *kvm = filp->private_data;
2492 if (kvm->mm != current->mm)
2495 case KVM_GET_DIRTY_LOG: {
2496 struct compat_kvm_dirty_log compat_log;
2497 struct kvm_dirty_log log;
2500 if (copy_from_user(&compat_log, (void __user *)arg,
2501 sizeof(compat_log)))
2503 log.slot = compat_log.slot;
2504 log.padding1 = compat_log.padding1;
2505 log.padding2 = compat_log.padding2;
2506 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
2508 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2512 r = kvm_vm_ioctl(filp, ioctl, arg);
2520 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2522 struct page *page[1];
2525 gfn_t gfn = vmf->pgoff;
2526 struct kvm *kvm = vma->vm_file->private_data;
2528 addr = gfn_to_hva(kvm, gfn);
2529 if (kvm_is_error_hva(addr))
2530 return VM_FAULT_SIGBUS;
2532 npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
2534 if (unlikely(npages != 1))
2535 return VM_FAULT_SIGBUS;
2537 vmf->page = page[0];
2541 static const struct vm_operations_struct kvm_vm_vm_ops = {
2542 .fault = kvm_vm_fault,
2545 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2547 vma->vm_ops = &kvm_vm_vm_ops;
2551 static struct file_operations kvm_vm_fops = {
2552 .release = kvm_vm_release,
2553 .unlocked_ioctl = kvm_vm_ioctl,
2554 #ifdef CONFIG_COMPAT
2555 .compat_ioctl = kvm_vm_compat_ioctl,
2557 .mmap = kvm_vm_mmap,
2558 .llseek = noop_llseek,
2561 static int kvm_dev_ioctl_create_vm(unsigned long type)
2566 kvm = kvm_create_vm(type);
2568 return PTR_ERR(kvm);
2569 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2570 r = kvm_coalesced_mmio_init(kvm);
2576 r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR | O_CLOEXEC);
2583 static long kvm_dev_ioctl_check_extension_generic(long arg)
2586 case KVM_CAP_USER_MEMORY:
2587 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
2588 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
2589 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2590 case KVM_CAP_SET_BOOT_CPU_ID:
2592 case KVM_CAP_INTERNAL_ERROR_DATA:
2593 #ifdef CONFIG_HAVE_KVM_MSI
2594 case KVM_CAP_SIGNAL_MSI:
2596 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2597 case KVM_CAP_IRQFD_RESAMPLE:
2600 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2601 case KVM_CAP_IRQ_ROUTING:
2602 return KVM_MAX_IRQ_ROUTES;
2607 return kvm_dev_ioctl_check_extension(arg);
2610 static long kvm_dev_ioctl(struct file *filp,
2611 unsigned int ioctl, unsigned long arg)
2616 case KVM_GET_API_VERSION:
2620 r = KVM_API_VERSION;
2623 r = kvm_dev_ioctl_create_vm(arg);
2625 case KVM_CHECK_EXTENSION:
2626 r = kvm_dev_ioctl_check_extension_generic(arg);
2628 case KVM_GET_VCPU_MMAP_SIZE:
2632 r = PAGE_SIZE; /* struct kvm_run */
2634 r += PAGE_SIZE; /* pio data page */
2636 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2637 r += PAGE_SIZE; /* coalesced mmio ring page */
2640 case KVM_TRACE_ENABLE:
2641 case KVM_TRACE_PAUSE:
2642 case KVM_TRACE_DISABLE:
2646 return kvm_arch_dev_ioctl(filp, ioctl, arg);
2652 static struct file_operations kvm_chardev_ops = {
2653 .unlocked_ioctl = kvm_dev_ioctl,
2654 .compat_ioctl = kvm_dev_ioctl,
2655 .llseek = noop_llseek,
2658 static struct miscdevice kvm_dev = {
2664 static void hardware_enable_nolock(void *junk)
2666 int cpu = raw_smp_processor_id();
2669 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
2672 cpumask_set_cpu(cpu, cpus_hardware_enabled);
2674 r = kvm_arch_hardware_enable(NULL);
2677 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2678 atomic_inc(&hardware_enable_failed);
2679 printk(KERN_INFO "kvm: enabling virtualization on "
2680 "CPU%d failed\n", cpu);
2684 static void hardware_enable(void *junk)
2686 raw_spin_lock(&kvm_lock);
2687 hardware_enable_nolock(junk);
2688 raw_spin_unlock(&kvm_lock);
2691 static void hardware_disable_nolock(void *junk)
2693 int cpu = raw_smp_processor_id();
2695 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
2697 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2698 kvm_arch_hardware_disable(NULL);
2701 static void hardware_disable(void *junk)
2703 raw_spin_lock(&kvm_lock);
2704 hardware_disable_nolock(junk);
2705 raw_spin_unlock(&kvm_lock);
2708 static void hardware_disable_all_nolock(void)
2710 BUG_ON(!kvm_usage_count);
2713 if (!kvm_usage_count)
2714 on_each_cpu(hardware_disable_nolock, NULL, 1);
2717 static void hardware_disable_all(void)
2719 raw_spin_lock(&kvm_lock);
2720 hardware_disable_all_nolock();
2721 raw_spin_unlock(&kvm_lock);
2724 static int hardware_enable_all(void)
2728 raw_spin_lock(&kvm_lock);
2731 if (kvm_usage_count == 1) {
2732 atomic_set(&hardware_enable_failed, 0);
2733 on_each_cpu(hardware_enable_nolock, NULL, 1);
2735 if (atomic_read(&hardware_enable_failed)) {
2736 hardware_disable_all_nolock();
2741 raw_spin_unlock(&kvm_lock);
2746 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2751 if (!kvm_usage_count)
2754 val &= ~CPU_TASKS_FROZEN;
2757 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2759 hardware_disable(NULL);
2762 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2764 hardware_enable(NULL);
2770 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2774 * Some (well, at least mine) BIOSes hang on reboot if
2777 * And Intel TXT required VMX off for all cpu when system shutdown.
2779 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2780 kvm_rebooting = true;
2781 on_each_cpu(hardware_disable_nolock, NULL, 1);
2785 static struct notifier_block kvm_reboot_notifier = {
2786 .notifier_call = kvm_reboot,
2790 static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
2794 for (i = 0; i < bus->dev_count; i++) {
2795 struct kvm_io_device *pos = bus->range[i].dev;
2797 kvm_iodevice_destructor(pos);
2802 static inline int kvm_io_bus_cmp(const struct kvm_io_range *r1,
2803 const struct kvm_io_range *r2)
2805 if (r1->addr < r2->addr)
2807 if (r1->addr + r1->len > r2->addr + r2->len)
2812 static int kvm_io_bus_sort_cmp(const void *p1, const void *p2)
2814 return kvm_io_bus_cmp(p1, p2);
2817 static int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev,
2818 gpa_t addr, int len)
2820 bus->range[bus->dev_count++] = (struct kvm_io_range) {
2826 sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range),
2827 kvm_io_bus_sort_cmp, NULL);
2832 static int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus,
2833 gpa_t addr, int len)
2835 struct kvm_io_range *range, key;
2838 key = (struct kvm_io_range) {
2843 range = bsearch(&key, bus->range, bus->dev_count,
2844 sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp);
2848 off = range - bus->range;
2850 while (off > 0 && kvm_io_bus_cmp(&key, &bus->range[off-1]) == 0)
2856 static int __kvm_io_bus_write(struct kvm_io_bus *bus,
2857 struct kvm_io_range *range, const void *val)
2861 idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
2865 while (idx < bus->dev_count &&
2866 kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
2867 if (!kvm_iodevice_write(bus->range[idx].dev, range->addr,
2876 /* kvm_io_bus_write - called under kvm->slots_lock */
2877 int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2878 int len, const void *val)
2880 struct kvm_io_bus *bus;
2881 struct kvm_io_range range;
2884 range = (struct kvm_io_range) {
2889 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2890 r = __kvm_io_bus_write(bus, &range, val);
2891 return r < 0 ? r : 0;
2894 /* kvm_io_bus_write_cookie - called under kvm->slots_lock */
2895 int kvm_io_bus_write_cookie(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2896 int len, const void *val, long cookie)
2898 struct kvm_io_bus *bus;
2899 struct kvm_io_range range;
2901 range = (struct kvm_io_range) {
2906 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2908 /* First try the device referenced by cookie. */
2909 if ((cookie >= 0) && (cookie < bus->dev_count) &&
2910 (kvm_io_bus_cmp(&range, &bus->range[cookie]) == 0))
2911 if (!kvm_iodevice_write(bus->range[cookie].dev, addr, len,
2916 * cookie contained garbage; fall back to search and return the
2917 * correct cookie value.
2919 return __kvm_io_bus_write(bus, &range, val);
2922 static int __kvm_io_bus_read(struct kvm_io_bus *bus, struct kvm_io_range *range,
2927 idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
2931 while (idx < bus->dev_count &&
2932 kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
2933 if (!kvm_iodevice_read(bus->range[idx].dev, range->addr,
2942 /* kvm_io_bus_read - called under kvm->slots_lock */
2943 int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2946 struct kvm_io_bus *bus;
2947 struct kvm_io_range range;
2950 range = (struct kvm_io_range) {
2955 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2956 r = __kvm_io_bus_read(bus, &range, val);
2957 return r < 0 ? r : 0;
2960 /* kvm_io_bus_read_cookie - called under kvm->slots_lock */
2961 int kvm_io_bus_read_cookie(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2962 int len, void *val, long cookie)
2964 struct kvm_io_bus *bus;
2965 struct kvm_io_range range;
2967 range = (struct kvm_io_range) {
2972 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2974 /* First try the device referenced by cookie. */
2975 if ((cookie >= 0) && (cookie < bus->dev_count) &&
2976 (kvm_io_bus_cmp(&range, &bus->range[cookie]) == 0))
2977 if (!kvm_iodevice_read(bus->range[cookie].dev, addr, len,
2982 * cookie contained garbage; fall back to search and return the
2983 * correct cookie value.
2985 return __kvm_io_bus_read(bus, &range, val);
2988 /* Caller must hold slots_lock. */
2989 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2990 int len, struct kvm_io_device *dev)
2992 struct kvm_io_bus *new_bus, *bus;
2994 bus = kvm->buses[bus_idx];
2995 /* exclude ioeventfd which is limited by maximum fd */
2996 if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1)
2999 new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count + 1) *
3000 sizeof(struct kvm_io_range)), GFP_KERNEL);
3003 memcpy(new_bus, bus, sizeof(*bus) + (bus->dev_count *
3004 sizeof(struct kvm_io_range)));
3005 kvm_io_bus_insert_dev(new_bus, dev, addr, len);
3006 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
3007 synchronize_srcu_expedited(&kvm->srcu);
3013 /* Caller must hold slots_lock. */
3014 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
3015 struct kvm_io_device *dev)
3018 struct kvm_io_bus *new_bus, *bus;
3020 bus = kvm->buses[bus_idx];
3022 for (i = 0; i < bus->dev_count; i++)
3023 if (bus->range[i].dev == dev) {
3031 new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count - 1) *
3032 sizeof(struct kvm_io_range)), GFP_KERNEL);
3036 memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range));
3037 new_bus->dev_count--;
3038 memcpy(new_bus->range + i, bus->range + i + 1,
3039 (new_bus->dev_count - i) * sizeof(struct kvm_io_range));
3041 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
3042 synchronize_srcu_expedited(&kvm->srcu);
3047 static struct notifier_block kvm_cpu_notifier = {
3048 .notifier_call = kvm_cpu_hotplug,
3051 static int vm_stat_get(void *_offset, u64 *val)
3053 unsigned offset = (long)_offset;
3057 raw_spin_lock(&kvm_lock);
3058 list_for_each_entry(kvm, &vm_list, vm_list)
3059 *val += *(u32 *)((void *)kvm + offset);
3060 raw_spin_unlock(&kvm_lock);
3064 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
3066 static int vcpu_stat_get(void *_offset, u64 *val)
3068 unsigned offset = (long)_offset;
3070 struct kvm_vcpu *vcpu;
3074 raw_spin_lock(&kvm_lock);
3075 list_for_each_entry(kvm, &vm_list, vm_list)
3076 kvm_for_each_vcpu(i, vcpu, kvm)
3077 *val += *(u32 *)((void *)vcpu + offset);
3079 raw_spin_unlock(&kvm_lock);
3083 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
3085 static const struct file_operations *stat_fops[] = {
3086 [KVM_STAT_VCPU] = &vcpu_stat_fops,
3087 [KVM_STAT_VM] = &vm_stat_fops,
3090 static int kvm_init_debug(void)
3093 struct kvm_stats_debugfs_item *p;
3095 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
3096 if (kvm_debugfs_dir == NULL)
3099 for (p = debugfs_entries; p->name; ++p) {
3100 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
3101 (void *)(long)p->offset,
3102 stat_fops[p->kind]);
3103 if (p->dentry == NULL)
3110 debugfs_remove_recursive(kvm_debugfs_dir);
3115 static void kvm_exit_debug(void)
3117 struct kvm_stats_debugfs_item *p;
3119 for (p = debugfs_entries; p->name; ++p)
3120 debugfs_remove(p->dentry);
3121 debugfs_remove(kvm_debugfs_dir);
3124 static int kvm_suspend(void)
3126 if (kvm_usage_count)
3127 hardware_disable_nolock(NULL);
3131 static void kvm_resume(void)
3133 if (kvm_usage_count) {
3134 WARN_ON(raw_spin_is_locked(&kvm_lock));
3135 hardware_enable_nolock(NULL);
3139 static struct syscore_ops kvm_syscore_ops = {
3140 .suspend = kvm_suspend,
3141 .resume = kvm_resume,
3145 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
3147 return container_of(pn, struct kvm_vcpu, preempt_notifier);
3150 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
3152 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3153 if (vcpu->preempted)
3154 vcpu->preempted = false;
3156 kvm_arch_vcpu_load(vcpu, cpu);
3159 static void kvm_sched_out(struct preempt_notifier *pn,
3160 struct task_struct *next)
3162 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3164 if (current->state == TASK_RUNNING)
3165 vcpu->preempted = true;
3166 kvm_arch_vcpu_put(vcpu);
3169 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
3170 struct module *module)
3175 r = kvm_arch_init(opaque);
3180 * kvm_arch_init makes sure there's at most one caller
3181 * for architectures that support multiple implementations,
3182 * like intel and amd on x86.
3183 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
3184 * conflicts in case kvm is already setup for another implementation.
3186 r = kvm_irqfd_init();
3190 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
3195 r = kvm_arch_hardware_setup();
3199 for_each_online_cpu(cpu) {
3200 smp_call_function_single(cpu,
3201 kvm_arch_check_processor_compat,
3207 r = register_cpu_notifier(&kvm_cpu_notifier);
3210 register_reboot_notifier(&kvm_reboot_notifier);
3212 /* A kmem cache lets us meet the alignment requirements of fx_save. */
3214 vcpu_align = __alignof__(struct kvm_vcpu);
3215 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
3217 if (!kvm_vcpu_cache) {
3222 r = kvm_async_pf_init();
3226 kvm_chardev_ops.owner = module;
3227 kvm_vm_fops.owner = module;
3228 kvm_vcpu_fops.owner = module;
3230 r = misc_register(&kvm_dev);
3232 printk(KERN_ERR "kvm: misc device register failed\n");
3236 register_syscore_ops(&kvm_syscore_ops);
3238 kvm_preempt_ops.sched_in = kvm_sched_in;
3239 kvm_preempt_ops.sched_out = kvm_sched_out;
3241 r = kvm_init_debug();
3243 printk(KERN_ERR "kvm: create debugfs files failed\n");
3250 unregister_syscore_ops(&kvm_syscore_ops);
3251 misc_deregister(&kvm_dev);
3253 kvm_async_pf_deinit();
3255 kmem_cache_destroy(kvm_vcpu_cache);
3257 unregister_reboot_notifier(&kvm_reboot_notifier);
3258 unregister_cpu_notifier(&kvm_cpu_notifier);
3261 kvm_arch_hardware_unsetup();
3263 free_cpumask_var(cpus_hardware_enabled);
3271 EXPORT_SYMBOL_GPL(kvm_init);
3276 misc_deregister(&kvm_dev);
3277 kmem_cache_destroy(kvm_vcpu_cache);
3278 kvm_async_pf_deinit();
3279 unregister_syscore_ops(&kvm_syscore_ops);
3280 unregister_reboot_notifier(&kvm_reboot_notifier);
3281 unregister_cpu_notifier(&kvm_cpu_notifier);
3282 on_each_cpu(hardware_disable_nolock, NULL, 1);
3283 kvm_arch_hardware_unsetup();
3286 free_cpumask_var(cpus_hardware_enabled);
3288 EXPORT_SYMBOL_GPL(kvm_exit);