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.
19 #include <kvm/iodev.h>
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/ioctl.h>
56 #include <asm/uaccess.h>
57 #include <asm/pgtable.h>
59 #include "coalesced_mmio.h"
63 #define CREATE_TRACE_POINTS
64 #include <trace/events/kvm.h>
66 MODULE_AUTHOR("Qumranet");
67 MODULE_LICENSE("GPL");
69 /* Architectures should define their poll value according to the halt latency */
70 static unsigned int halt_poll_ns = KVM_HALT_POLL_NS_DEFAULT;
71 module_param(halt_poll_ns, uint, S_IRUGO | S_IWUSR);
73 /* Default doubles per-vcpu halt_poll_ns. */
74 static unsigned int halt_poll_ns_grow = 2;
75 module_param(halt_poll_ns_grow, uint, S_IRUGO | S_IWUSR);
77 /* Default resets per-vcpu halt_poll_ns . */
78 static unsigned int halt_poll_ns_shrink;
79 module_param(halt_poll_ns_shrink, uint, S_IRUGO | S_IWUSR);
84 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
87 DEFINE_SPINLOCK(kvm_lock);
88 static DEFINE_RAW_SPINLOCK(kvm_count_lock);
91 static cpumask_var_t cpus_hardware_enabled;
92 static int kvm_usage_count;
93 static atomic_t hardware_enable_failed;
95 struct kmem_cache *kvm_vcpu_cache;
96 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
98 static __read_mostly struct preempt_ops kvm_preempt_ops;
100 struct dentry *kvm_debugfs_dir;
101 EXPORT_SYMBOL_GPL(kvm_debugfs_dir);
103 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
105 #ifdef CONFIG_KVM_COMPAT
106 static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl,
109 static int hardware_enable_all(void);
110 static void hardware_disable_all(void);
112 static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
114 static void kvm_release_pfn_dirty(kvm_pfn_t pfn);
115 static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, gfn_t gfn);
117 __visible bool kvm_rebooting;
118 EXPORT_SYMBOL_GPL(kvm_rebooting);
120 static bool largepages_enabled = true;
122 bool kvm_is_reserved_pfn(kvm_pfn_t pfn)
125 return PageReserved(pfn_to_page(pfn));
131 * Switches to specified vcpu, until a matching vcpu_put()
133 int vcpu_load(struct kvm_vcpu *vcpu)
137 if (mutex_lock_killable(&vcpu->mutex))
140 preempt_notifier_register(&vcpu->preempt_notifier);
141 kvm_arch_vcpu_load(vcpu, cpu);
146 void vcpu_put(struct kvm_vcpu *vcpu)
149 kvm_arch_vcpu_put(vcpu);
150 preempt_notifier_unregister(&vcpu->preempt_notifier);
152 mutex_unlock(&vcpu->mutex);
155 static void ack_flush(void *_completed)
159 bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req)
164 struct kvm_vcpu *vcpu;
166 zalloc_cpumask_var(&cpus, GFP_ATOMIC);
169 kvm_for_each_vcpu(i, vcpu, kvm) {
170 kvm_make_request(req, vcpu);
173 /* Set ->requests bit before we read ->mode */
176 if (cpus != NULL && cpu != -1 && cpu != me &&
177 kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE)
178 cpumask_set_cpu(cpu, cpus);
180 if (unlikely(cpus == NULL))
181 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
182 else if (!cpumask_empty(cpus))
183 smp_call_function_many(cpus, ack_flush, NULL, 1);
187 free_cpumask_var(cpus);
191 #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
192 void kvm_flush_remote_tlbs(struct kvm *kvm)
194 long dirty_count = kvm->tlbs_dirty;
197 if (kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
198 ++kvm->stat.remote_tlb_flush;
199 cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
201 EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
204 void kvm_reload_remote_mmus(struct kvm *kvm)
206 kvm_make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
209 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
214 mutex_init(&vcpu->mutex);
219 init_swait_queue_head(&vcpu->wq);
220 kvm_async_pf_vcpu_init(vcpu);
223 INIT_LIST_HEAD(&vcpu->blocked_vcpu_list);
225 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
230 vcpu->run = page_address(page);
232 kvm_vcpu_set_in_spin_loop(vcpu, false);
233 kvm_vcpu_set_dy_eligible(vcpu, false);
234 vcpu->preempted = false;
236 r = kvm_arch_vcpu_init(vcpu);
242 free_page((unsigned long)vcpu->run);
246 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
248 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
251 kvm_arch_vcpu_uninit(vcpu);
252 free_page((unsigned long)vcpu->run);
254 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
256 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
257 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
259 return container_of(mn, struct kvm, mmu_notifier);
262 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
263 struct mm_struct *mm,
264 unsigned long address)
266 struct kvm *kvm = mmu_notifier_to_kvm(mn);
267 int need_tlb_flush, idx;
270 * When ->invalidate_page runs, the linux pte has been zapped
271 * already but the page is still allocated until
272 * ->invalidate_page returns. So if we increase the sequence
273 * here the kvm page fault will notice if the spte can't be
274 * established because the page is going to be freed. If
275 * instead the kvm page fault establishes the spte before
276 * ->invalidate_page runs, kvm_unmap_hva will release it
279 * The sequence increase only need to be seen at spin_unlock
280 * time, and not at spin_lock time.
282 * Increasing the sequence after the spin_unlock would be
283 * unsafe because the kvm page fault could then establish the
284 * pte after kvm_unmap_hva returned, without noticing the page
285 * is going to be freed.
287 idx = srcu_read_lock(&kvm->srcu);
288 spin_lock(&kvm->mmu_lock);
290 kvm->mmu_notifier_seq++;
291 need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty;
292 /* we've to flush the tlb before the pages can be freed */
294 kvm_flush_remote_tlbs(kvm);
296 spin_unlock(&kvm->mmu_lock);
298 kvm_arch_mmu_notifier_invalidate_page(kvm, address);
300 srcu_read_unlock(&kvm->srcu, idx);
303 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
304 struct mm_struct *mm,
305 unsigned long address,
308 struct kvm *kvm = mmu_notifier_to_kvm(mn);
311 idx = srcu_read_lock(&kvm->srcu);
312 spin_lock(&kvm->mmu_lock);
313 kvm->mmu_notifier_seq++;
314 kvm_set_spte_hva(kvm, address, pte);
315 spin_unlock(&kvm->mmu_lock);
316 srcu_read_unlock(&kvm->srcu, idx);
319 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
320 struct mm_struct *mm,
324 struct kvm *kvm = mmu_notifier_to_kvm(mn);
325 int need_tlb_flush = 0, idx;
327 idx = srcu_read_lock(&kvm->srcu);
328 spin_lock(&kvm->mmu_lock);
330 * The count increase must become visible at unlock time as no
331 * spte can be established without taking the mmu_lock and
332 * count is also read inside the mmu_lock critical section.
334 kvm->mmu_notifier_count++;
335 need_tlb_flush = kvm_unmap_hva_range(kvm, start, end);
336 need_tlb_flush |= kvm->tlbs_dirty;
337 /* we've to flush the tlb before the pages can be freed */
339 kvm_flush_remote_tlbs(kvm);
341 spin_unlock(&kvm->mmu_lock);
342 srcu_read_unlock(&kvm->srcu, idx);
345 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
346 struct mm_struct *mm,
350 struct kvm *kvm = mmu_notifier_to_kvm(mn);
352 spin_lock(&kvm->mmu_lock);
354 * This sequence increase will notify the kvm page fault that
355 * the page that is going to be mapped in the spte could have
358 kvm->mmu_notifier_seq++;
361 * The above sequence increase must be visible before the
362 * below count decrease, which is ensured by the smp_wmb above
363 * in conjunction with the smp_rmb in mmu_notifier_retry().
365 kvm->mmu_notifier_count--;
366 spin_unlock(&kvm->mmu_lock);
368 BUG_ON(kvm->mmu_notifier_count < 0);
371 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
372 struct mm_struct *mm,
376 struct kvm *kvm = mmu_notifier_to_kvm(mn);
379 idx = srcu_read_lock(&kvm->srcu);
380 spin_lock(&kvm->mmu_lock);
382 young = kvm_age_hva(kvm, start, end);
384 kvm_flush_remote_tlbs(kvm);
386 spin_unlock(&kvm->mmu_lock);
387 srcu_read_unlock(&kvm->srcu, idx);
392 static int kvm_mmu_notifier_clear_young(struct mmu_notifier *mn,
393 struct mm_struct *mm,
397 struct kvm *kvm = mmu_notifier_to_kvm(mn);
400 idx = srcu_read_lock(&kvm->srcu);
401 spin_lock(&kvm->mmu_lock);
403 * Even though we do not flush TLB, this will still adversely
404 * affect performance on pre-Haswell Intel EPT, where there is
405 * no EPT Access Bit to clear so that we have to tear down EPT
406 * tables instead. If we find this unacceptable, we can always
407 * add a parameter to kvm_age_hva so that it effectively doesn't
408 * do anything on clear_young.
410 * Also note that currently we never issue secondary TLB flushes
411 * from clear_young, leaving this job up to the regular system
412 * cadence. If we find this inaccurate, we might come up with a
413 * more sophisticated heuristic later.
415 young = kvm_age_hva(kvm, start, end);
416 spin_unlock(&kvm->mmu_lock);
417 srcu_read_unlock(&kvm->srcu, idx);
422 static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn,
423 struct mm_struct *mm,
424 unsigned long address)
426 struct kvm *kvm = mmu_notifier_to_kvm(mn);
429 idx = srcu_read_lock(&kvm->srcu);
430 spin_lock(&kvm->mmu_lock);
431 young = kvm_test_age_hva(kvm, address);
432 spin_unlock(&kvm->mmu_lock);
433 srcu_read_unlock(&kvm->srcu, idx);
438 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
439 struct mm_struct *mm)
441 struct kvm *kvm = mmu_notifier_to_kvm(mn);
444 idx = srcu_read_lock(&kvm->srcu);
445 kvm_arch_flush_shadow_all(kvm);
446 srcu_read_unlock(&kvm->srcu, idx);
449 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
450 .invalidate_page = kvm_mmu_notifier_invalidate_page,
451 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
452 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
453 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
454 .clear_young = kvm_mmu_notifier_clear_young,
455 .test_young = kvm_mmu_notifier_test_young,
456 .change_pte = kvm_mmu_notifier_change_pte,
457 .release = kvm_mmu_notifier_release,
460 static int kvm_init_mmu_notifier(struct kvm *kvm)
462 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
463 return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
466 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
468 static int kvm_init_mmu_notifier(struct kvm *kvm)
473 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
475 static struct kvm_memslots *kvm_alloc_memslots(void)
478 struct kvm_memslots *slots;
480 slots = kvm_kvzalloc(sizeof(struct kvm_memslots));
485 * Init kvm generation close to the maximum to easily test the
486 * code of handling generation number wrap-around.
488 slots->generation = -150;
489 for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
490 slots->id_to_index[i] = slots->memslots[i].id = i;
495 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
497 if (!memslot->dirty_bitmap)
500 kvfree(memslot->dirty_bitmap);
501 memslot->dirty_bitmap = NULL;
505 * Free any memory in @free but not in @dont.
507 static void kvm_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
508 struct kvm_memory_slot *dont)
510 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
511 kvm_destroy_dirty_bitmap(free);
513 kvm_arch_free_memslot(kvm, free, dont);
518 static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots)
520 struct kvm_memory_slot *memslot;
525 kvm_for_each_memslot(memslot, slots)
526 kvm_free_memslot(kvm, memslot, NULL);
531 static struct kvm *kvm_create_vm(unsigned long type)
534 struct kvm *kvm = kvm_arch_alloc_vm();
537 return ERR_PTR(-ENOMEM);
539 spin_lock_init(&kvm->mmu_lock);
540 atomic_inc(¤t->mm->mm_count);
541 kvm->mm = current->mm;
542 kvm_eventfd_init(kvm);
543 mutex_init(&kvm->lock);
544 mutex_init(&kvm->irq_lock);
545 mutex_init(&kvm->slots_lock);
546 atomic_set(&kvm->users_count, 1);
547 INIT_LIST_HEAD(&kvm->devices);
549 r = kvm_arch_init_vm(kvm, type);
551 goto out_err_no_disable;
553 r = hardware_enable_all();
555 goto out_err_no_disable;
557 #ifdef CONFIG_HAVE_KVM_IRQFD
558 INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
561 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX);
564 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
565 kvm->memslots[i] = kvm_alloc_memslots();
566 if (!kvm->memslots[i])
567 goto out_err_no_srcu;
570 if (init_srcu_struct(&kvm->srcu))
571 goto out_err_no_srcu;
572 if (init_srcu_struct(&kvm->irq_srcu))
573 goto out_err_no_irq_srcu;
574 for (i = 0; i < KVM_NR_BUSES; i++) {
575 kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus),
581 r = kvm_init_mmu_notifier(kvm);
585 spin_lock(&kvm_lock);
586 list_add(&kvm->vm_list, &vm_list);
587 spin_unlock(&kvm_lock);
589 preempt_notifier_inc();
594 cleanup_srcu_struct(&kvm->irq_srcu);
596 cleanup_srcu_struct(&kvm->srcu);
598 hardware_disable_all();
600 for (i = 0; i < KVM_NR_BUSES; i++)
601 kfree(kvm->buses[i]);
602 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
603 kvm_free_memslots(kvm, kvm->memslots[i]);
604 kvm_arch_free_vm(kvm);
610 * Avoid using vmalloc for a small buffer.
611 * Should not be used when the size is statically known.
613 void *kvm_kvzalloc(unsigned long size)
615 if (size > PAGE_SIZE)
616 return vzalloc(size);
618 return kzalloc(size, GFP_KERNEL);
621 static void kvm_destroy_devices(struct kvm *kvm)
623 struct kvm_device *dev, *tmp;
625 list_for_each_entry_safe(dev, tmp, &kvm->devices, vm_node) {
626 list_del(&dev->vm_node);
627 dev->ops->destroy(dev);
631 static void kvm_destroy_vm(struct kvm *kvm)
634 struct mm_struct *mm = kvm->mm;
636 kvm_arch_sync_events(kvm);
637 spin_lock(&kvm_lock);
638 list_del(&kvm->vm_list);
639 spin_unlock(&kvm_lock);
640 kvm_free_irq_routing(kvm);
641 for (i = 0; i < KVM_NR_BUSES; i++)
642 kvm_io_bus_destroy(kvm->buses[i]);
643 kvm_coalesced_mmio_free(kvm);
644 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
645 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
647 kvm_arch_flush_shadow_all(kvm);
649 kvm_arch_destroy_vm(kvm);
650 kvm_destroy_devices(kvm);
651 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
652 kvm_free_memslots(kvm, kvm->memslots[i]);
653 cleanup_srcu_struct(&kvm->irq_srcu);
654 cleanup_srcu_struct(&kvm->srcu);
655 kvm_arch_free_vm(kvm);
656 preempt_notifier_dec();
657 hardware_disable_all();
661 void kvm_get_kvm(struct kvm *kvm)
663 atomic_inc(&kvm->users_count);
665 EXPORT_SYMBOL_GPL(kvm_get_kvm);
667 void kvm_put_kvm(struct kvm *kvm)
669 if (atomic_dec_and_test(&kvm->users_count))
672 EXPORT_SYMBOL_GPL(kvm_put_kvm);
675 static int kvm_vm_release(struct inode *inode, struct file *filp)
677 struct kvm *kvm = filp->private_data;
679 kvm_irqfd_release(kvm);
686 * Allocation size is twice as large as the actual dirty bitmap size.
687 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
689 static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
691 unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
693 memslot->dirty_bitmap = kvm_kvzalloc(dirty_bytes);
694 if (!memslot->dirty_bitmap)
701 * Insert memslot and re-sort memslots based on their GFN,
702 * so binary search could be used to lookup GFN.
703 * Sorting algorithm takes advantage of having initially
704 * sorted array and known changed memslot position.
706 static void update_memslots(struct kvm_memslots *slots,
707 struct kvm_memory_slot *new)
710 int i = slots->id_to_index[id];
711 struct kvm_memory_slot *mslots = slots->memslots;
713 WARN_ON(mslots[i].id != id);
715 WARN_ON(!mslots[i].npages);
716 if (mslots[i].npages)
719 if (!mslots[i].npages)
723 while (i < KVM_MEM_SLOTS_NUM - 1 &&
724 new->base_gfn <= mslots[i + 1].base_gfn) {
725 if (!mslots[i + 1].npages)
727 mslots[i] = mslots[i + 1];
728 slots->id_to_index[mslots[i].id] = i;
733 * The ">=" is needed when creating a slot with base_gfn == 0,
734 * so that it moves before all those with base_gfn == npages == 0.
736 * On the other hand, if new->npages is zero, the above loop has
737 * already left i pointing to the beginning of the empty part of
738 * mslots, and the ">=" would move the hole backwards in this
739 * case---which is wrong. So skip the loop when deleting a slot.
743 new->base_gfn >= mslots[i - 1].base_gfn) {
744 mslots[i] = mslots[i - 1];
745 slots->id_to_index[mslots[i].id] = i;
749 WARN_ON_ONCE(i != slots->used_slots);
752 slots->id_to_index[mslots[i].id] = i;
755 static int check_memory_region_flags(const struct kvm_userspace_memory_region *mem)
757 u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES;
759 #ifdef __KVM_HAVE_READONLY_MEM
760 valid_flags |= KVM_MEM_READONLY;
763 if (mem->flags & ~valid_flags)
769 static struct kvm_memslots *install_new_memslots(struct kvm *kvm,
770 int as_id, struct kvm_memslots *slots)
772 struct kvm_memslots *old_memslots = __kvm_memslots(kvm, as_id);
775 * Set the low bit in the generation, which disables SPTE caching
776 * until the end of synchronize_srcu_expedited.
778 WARN_ON(old_memslots->generation & 1);
779 slots->generation = old_memslots->generation + 1;
781 rcu_assign_pointer(kvm->memslots[as_id], slots);
782 synchronize_srcu_expedited(&kvm->srcu);
785 * Increment the new memslot generation a second time. This prevents
786 * vm exits that race with memslot updates from caching a memslot
787 * generation that will (potentially) be valid forever.
791 kvm_arch_memslots_updated(kvm, slots);
797 * Allocate some memory and give it an address in the guest physical address
800 * Discontiguous memory is allowed, mostly for framebuffers.
802 * Must be called holding kvm->slots_lock for write.
804 int __kvm_set_memory_region(struct kvm *kvm,
805 const struct kvm_userspace_memory_region *mem)
809 unsigned long npages;
810 struct kvm_memory_slot *slot;
811 struct kvm_memory_slot old, new;
812 struct kvm_memslots *slots = NULL, *old_memslots;
814 enum kvm_mr_change change;
816 r = check_memory_region_flags(mem);
821 as_id = mem->slot >> 16;
824 /* General sanity checks */
825 if (mem->memory_size & (PAGE_SIZE - 1))
827 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
829 /* We can read the guest memory with __xxx_user() later on. */
830 if ((id < KVM_USER_MEM_SLOTS) &&
831 ((mem->userspace_addr & (PAGE_SIZE - 1)) ||
832 !access_ok(VERIFY_WRITE,
833 (void __user *)(unsigned long)mem->userspace_addr,
836 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_MEM_SLOTS_NUM)
838 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
841 slot = id_to_memslot(__kvm_memslots(kvm, as_id), id);
842 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
843 npages = mem->memory_size >> PAGE_SHIFT;
845 if (npages > KVM_MEM_MAX_NR_PAGES)
851 new.base_gfn = base_gfn;
853 new.flags = mem->flags;
857 change = KVM_MR_CREATE;
858 else { /* Modify an existing slot. */
859 if ((mem->userspace_addr != old.userspace_addr) ||
860 (npages != old.npages) ||
861 ((new.flags ^ old.flags) & KVM_MEM_READONLY))
864 if (base_gfn != old.base_gfn)
865 change = KVM_MR_MOVE;
866 else if (new.flags != old.flags)
867 change = KVM_MR_FLAGS_ONLY;
868 else { /* Nothing to change. */
877 change = KVM_MR_DELETE;
882 if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
883 /* Check for overlaps */
885 kvm_for_each_memslot(slot, __kvm_memslots(kvm, as_id)) {
886 if ((slot->id >= KVM_USER_MEM_SLOTS) ||
889 if (!((base_gfn + npages <= slot->base_gfn) ||
890 (base_gfn >= slot->base_gfn + slot->npages)))
895 /* Free page dirty bitmap if unneeded */
896 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
897 new.dirty_bitmap = NULL;
900 if (change == KVM_MR_CREATE) {
901 new.userspace_addr = mem->userspace_addr;
903 if (kvm_arch_create_memslot(kvm, &new, npages))
907 /* Allocate page dirty bitmap if needed */
908 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
909 if (kvm_create_dirty_bitmap(&new) < 0)
913 slots = kvm_kvzalloc(sizeof(struct kvm_memslots));
916 memcpy(slots, __kvm_memslots(kvm, as_id), sizeof(struct kvm_memslots));
918 if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) {
919 slot = id_to_memslot(slots, id);
920 slot->flags |= KVM_MEMSLOT_INVALID;
922 old_memslots = install_new_memslots(kvm, as_id, slots);
924 /* slot was deleted or moved, clear iommu mapping */
925 kvm_iommu_unmap_pages(kvm, &old);
926 /* From this point no new shadow pages pointing to a deleted,
927 * or moved, memslot will be created.
929 * validation of sp->gfn happens in:
930 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
931 * - kvm_is_visible_gfn (mmu_check_roots)
933 kvm_arch_flush_shadow_memslot(kvm, slot);
936 * We can re-use the old_memslots from above, the only difference
937 * from the currently installed memslots is the invalid flag. This
938 * will get overwritten by update_memslots anyway.
940 slots = old_memslots;
943 r = kvm_arch_prepare_memory_region(kvm, &new, mem, change);
947 /* actual memory is freed via old in kvm_free_memslot below */
948 if (change == KVM_MR_DELETE) {
949 new.dirty_bitmap = NULL;
950 memset(&new.arch, 0, sizeof(new.arch));
953 update_memslots(slots, &new);
954 old_memslots = install_new_memslots(kvm, as_id, slots);
956 kvm_arch_commit_memory_region(kvm, mem, &old, &new, change);
958 kvm_free_memslot(kvm, &old, &new);
959 kvfree(old_memslots);
962 * IOMMU mapping: New slots need to be mapped. Old slots need to be
963 * un-mapped and re-mapped if their base changes. Since base change
964 * unmapping is handled above with slot deletion, mapping alone is
965 * needed here. Anything else the iommu might care about for existing
966 * slots (size changes, userspace addr changes and read-only flag
967 * changes) is disallowed above, so any other attribute changes getting
968 * here can be skipped.
970 if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
971 r = kvm_iommu_map_pages(kvm, &new);
980 kvm_free_memslot(kvm, &new, &old);
984 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
986 int kvm_set_memory_region(struct kvm *kvm,
987 const struct kvm_userspace_memory_region *mem)
991 mutex_lock(&kvm->slots_lock);
992 r = __kvm_set_memory_region(kvm, mem);
993 mutex_unlock(&kvm->slots_lock);
996 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
998 static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
999 struct kvm_userspace_memory_region *mem)
1001 if ((u16)mem->slot >= KVM_USER_MEM_SLOTS)
1004 return kvm_set_memory_region(kvm, mem);
1007 int kvm_get_dirty_log(struct kvm *kvm,
1008 struct kvm_dirty_log *log, int *is_dirty)
1010 struct kvm_memslots *slots;
1011 struct kvm_memory_slot *memslot;
1012 int r, i, as_id, id;
1014 unsigned long any = 0;
1017 as_id = log->slot >> 16;
1018 id = (u16)log->slot;
1019 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS)
1022 slots = __kvm_memslots(kvm, as_id);
1023 memslot = id_to_memslot(slots, id);
1025 if (!memslot->dirty_bitmap)
1028 n = kvm_dirty_bitmap_bytes(memslot);
1030 for (i = 0; !any && i < n/sizeof(long); ++i)
1031 any = memslot->dirty_bitmap[i];
1034 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
1044 EXPORT_SYMBOL_GPL(kvm_get_dirty_log);
1046 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
1048 * kvm_get_dirty_log_protect - get a snapshot of dirty pages, and if any pages
1049 * are dirty write protect them for next write.
1050 * @kvm: pointer to kvm instance
1051 * @log: slot id and address to which we copy the log
1052 * @is_dirty: flag set if any page is dirty
1054 * We need to keep it in mind that VCPU threads can write to the bitmap
1055 * concurrently. So, to avoid losing track of dirty pages we keep the
1058 * 1. Take a snapshot of the bit and clear it if needed.
1059 * 2. Write protect the corresponding page.
1060 * 3. Copy the snapshot to the userspace.
1061 * 4. Upon return caller flushes TLB's if needed.
1063 * Between 2 and 4, the guest may write to the page using the remaining TLB
1064 * entry. This is not a problem because the page is reported dirty using
1065 * the snapshot taken before and step 4 ensures that writes done after
1066 * exiting to userspace will be logged for the next call.
1069 int kvm_get_dirty_log_protect(struct kvm *kvm,
1070 struct kvm_dirty_log *log, bool *is_dirty)
1072 struct kvm_memslots *slots;
1073 struct kvm_memory_slot *memslot;
1074 int r, i, as_id, id;
1076 unsigned long *dirty_bitmap;
1077 unsigned long *dirty_bitmap_buffer;
1080 as_id = log->slot >> 16;
1081 id = (u16)log->slot;
1082 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS)
1085 slots = __kvm_memslots(kvm, as_id);
1086 memslot = id_to_memslot(slots, id);
1088 dirty_bitmap = memslot->dirty_bitmap;
1093 n = kvm_dirty_bitmap_bytes(memslot);
1095 dirty_bitmap_buffer = dirty_bitmap + n / sizeof(long);
1096 memset(dirty_bitmap_buffer, 0, n);
1098 spin_lock(&kvm->mmu_lock);
1100 for (i = 0; i < n / sizeof(long); i++) {
1104 if (!dirty_bitmap[i])
1109 mask = xchg(&dirty_bitmap[i], 0);
1110 dirty_bitmap_buffer[i] = mask;
1113 offset = i * BITS_PER_LONG;
1114 kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot,
1119 spin_unlock(&kvm->mmu_lock);
1122 if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n))
1129 EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect);
1132 bool kvm_largepages_enabled(void)
1134 return largepages_enabled;
1137 void kvm_disable_largepages(void)
1139 largepages_enabled = false;
1141 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
1143 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
1145 return __gfn_to_memslot(kvm_memslots(kvm), gfn);
1147 EXPORT_SYMBOL_GPL(gfn_to_memslot);
1149 struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn)
1151 return __gfn_to_memslot(kvm_vcpu_memslots(vcpu), gfn);
1154 bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
1156 struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn);
1158 if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS ||
1159 memslot->flags & KVM_MEMSLOT_INVALID)
1164 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
1166 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
1168 struct vm_area_struct *vma;
1169 unsigned long addr, size;
1173 addr = gfn_to_hva(kvm, gfn);
1174 if (kvm_is_error_hva(addr))
1177 down_read(¤t->mm->mmap_sem);
1178 vma = find_vma(current->mm, addr);
1182 size = vma_kernel_pagesize(vma);
1185 up_read(¤t->mm->mmap_sem);
1190 static bool memslot_is_readonly(struct kvm_memory_slot *slot)
1192 return slot->flags & KVM_MEM_READONLY;
1195 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1196 gfn_t *nr_pages, bool write)
1198 if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
1199 return KVM_HVA_ERR_BAD;
1201 if (memslot_is_readonly(slot) && write)
1202 return KVM_HVA_ERR_RO_BAD;
1205 *nr_pages = slot->npages - (gfn - slot->base_gfn);
1207 return __gfn_to_hva_memslot(slot, gfn);
1210 static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1213 return __gfn_to_hva_many(slot, gfn, nr_pages, true);
1216 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot,
1219 return gfn_to_hva_many(slot, gfn, NULL);
1221 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot);
1223 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1225 return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
1227 EXPORT_SYMBOL_GPL(gfn_to_hva);
1229 unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn)
1231 return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, NULL);
1233 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva);
1236 * If writable is set to false, the hva returned by this function is only
1237 * allowed to be read.
1239 unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot,
1240 gfn_t gfn, bool *writable)
1242 unsigned long hva = __gfn_to_hva_many(slot, gfn, NULL, false);
1244 if (!kvm_is_error_hva(hva) && writable)
1245 *writable = !memslot_is_readonly(slot);
1250 unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable)
1252 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1254 return gfn_to_hva_memslot_prot(slot, gfn, writable);
1257 unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable)
1259 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1261 return gfn_to_hva_memslot_prot(slot, gfn, writable);
1264 static int get_user_page_nowait(unsigned long start, int write,
1267 int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET;
1270 flags |= FOLL_WRITE;
1272 return __get_user_pages(current, current->mm, start, 1, flags, page,
1276 static inline int check_user_page_hwpoison(unsigned long addr)
1278 int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE;
1280 rc = __get_user_pages(current, current->mm, addr, 1,
1281 flags, NULL, NULL, NULL);
1282 return rc == -EHWPOISON;
1286 * The atomic path to get the writable pfn which will be stored in @pfn,
1287 * true indicates success, otherwise false is returned.
1289 static bool hva_to_pfn_fast(unsigned long addr, bool atomic, bool *async,
1290 bool write_fault, bool *writable, kvm_pfn_t *pfn)
1292 struct page *page[1];
1295 if (!(async || atomic))
1299 * Fast pin a writable pfn only if it is a write fault request
1300 * or the caller allows to map a writable pfn for a read fault
1303 if (!(write_fault || writable))
1306 npages = __get_user_pages_fast(addr, 1, 1, page);
1308 *pfn = page_to_pfn(page[0]);
1319 * The slow path to get the pfn of the specified host virtual address,
1320 * 1 indicates success, -errno is returned if error is detected.
1322 static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault,
1323 bool *writable, kvm_pfn_t *pfn)
1325 struct page *page[1];
1331 *writable = write_fault;
1334 down_read(¤t->mm->mmap_sem);
1335 npages = get_user_page_nowait(addr, write_fault, page);
1336 up_read(¤t->mm->mmap_sem);
1338 npages = __get_user_pages_unlocked(current, current->mm, addr, 1,
1339 write_fault, 0, page,
1340 FOLL_TOUCH|FOLL_HWPOISON);
1344 /* map read fault as writable if possible */
1345 if (unlikely(!write_fault) && writable) {
1346 struct page *wpage[1];
1348 npages = __get_user_pages_fast(addr, 1, 1, wpage);
1357 *pfn = page_to_pfn(page[0]);
1361 static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault)
1363 if (unlikely(!(vma->vm_flags & VM_READ)))
1366 if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE))))
1373 * Pin guest page in memory and return its pfn.
1374 * @addr: host virtual address which maps memory to the guest
1375 * @atomic: whether this function can sleep
1376 * @async: whether this function need to wait IO complete if the
1377 * host page is not in the memory
1378 * @write_fault: whether we should get a writable host page
1379 * @writable: whether it allows to map a writable host page for !@write_fault
1381 * The function will map a writable host page for these two cases:
1382 * 1): @write_fault = true
1383 * 2): @write_fault = false && @writable, @writable will tell the caller
1384 * whether the mapping is writable.
1386 static kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async,
1387 bool write_fault, bool *writable)
1389 struct vm_area_struct *vma;
1393 /* we can do it either atomically or asynchronously, not both */
1394 BUG_ON(atomic && async);
1396 if (hva_to_pfn_fast(addr, atomic, async, write_fault, writable, &pfn))
1400 return KVM_PFN_ERR_FAULT;
1402 npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn);
1406 down_read(¤t->mm->mmap_sem);
1407 if (npages == -EHWPOISON ||
1408 (!async && check_user_page_hwpoison(addr))) {
1409 pfn = KVM_PFN_ERR_HWPOISON;
1413 vma = find_vma_intersection(current->mm, addr, addr + 1);
1416 pfn = KVM_PFN_ERR_FAULT;
1417 else if ((vma->vm_flags & VM_PFNMAP)) {
1418 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) +
1420 BUG_ON(!kvm_is_reserved_pfn(pfn));
1422 if (async && vma_is_valid(vma, write_fault))
1424 pfn = KVM_PFN_ERR_FAULT;
1427 up_read(¤t->mm->mmap_sem);
1431 kvm_pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn,
1432 bool atomic, bool *async, bool write_fault,
1435 unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault);
1437 if (addr == KVM_HVA_ERR_RO_BAD) {
1440 return KVM_PFN_ERR_RO_FAULT;
1443 if (kvm_is_error_hva(addr)) {
1446 return KVM_PFN_NOSLOT;
1449 /* Do not map writable pfn in the readonly memslot. */
1450 if (writable && memslot_is_readonly(slot)) {
1455 return hva_to_pfn(addr, atomic, async, write_fault,
1458 EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot);
1460 kvm_pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1463 return __gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn, false, NULL,
1464 write_fault, writable);
1466 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
1468 kvm_pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
1470 return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL);
1472 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot);
1474 kvm_pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn)
1476 return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL);
1478 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic);
1480 kvm_pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
1482 return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm, gfn), gfn);
1484 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
1486 kvm_pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn)
1488 return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn);
1490 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic);
1492 kvm_pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1494 return gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn);
1496 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1498 kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn)
1500 return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn);
1502 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn);
1504 int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
1505 struct page **pages, int nr_pages)
1510 addr = gfn_to_hva_many(slot, gfn, &entry);
1511 if (kvm_is_error_hva(addr))
1514 if (entry < nr_pages)
1517 return __get_user_pages_fast(addr, nr_pages, 1, pages);
1519 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
1521 static struct page *kvm_pfn_to_page(kvm_pfn_t pfn)
1523 if (is_error_noslot_pfn(pfn))
1524 return KVM_ERR_PTR_BAD_PAGE;
1526 if (kvm_is_reserved_pfn(pfn)) {
1528 return KVM_ERR_PTR_BAD_PAGE;
1531 return pfn_to_page(pfn);
1534 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1538 pfn = gfn_to_pfn(kvm, gfn);
1540 return kvm_pfn_to_page(pfn);
1542 EXPORT_SYMBOL_GPL(gfn_to_page);
1544 struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn)
1548 pfn = kvm_vcpu_gfn_to_pfn(vcpu, gfn);
1550 return kvm_pfn_to_page(pfn);
1552 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page);
1554 void kvm_release_page_clean(struct page *page)
1556 WARN_ON(is_error_page(page));
1558 kvm_release_pfn_clean(page_to_pfn(page));
1560 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1562 void kvm_release_pfn_clean(kvm_pfn_t pfn)
1564 if (!is_error_noslot_pfn(pfn) && !kvm_is_reserved_pfn(pfn))
1565 put_page(pfn_to_page(pfn));
1567 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1569 void kvm_release_page_dirty(struct page *page)
1571 WARN_ON(is_error_page(page));
1573 kvm_release_pfn_dirty(page_to_pfn(page));
1575 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1577 static void kvm_release_pfn_dirty(kvm_pfn_t pfn)
1579 kvm_set_pfn_dirty(pfn);
1580 kvm_release_pfn_clean(pfn);
1583 void kvm_set_pfn_dirty(kvm_pfn_t pfn)
1585 if (!kvm_is_reserved_pfn(pfn)) {
1586 struct page *page = pfn_to_page(pfn);
1588 if (!PageReserved(page))
1592 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1594 void kvm_set_pfn_accessed(kvm_pfn_t pfn)
1596 if (!kvm_is_reserved_pfn(pfn))
1597 mark_page_accessed(pfn_to_page(pfn));
1599 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1601 void kvm_get_pfn(kvm_pfn_t pfn)
1603 if (!kvm_is_reserved_pfn(pfn))
1604 get_page(pfn_to_page(pfn));
1606 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1608 static int next_segment(unsigned long len, int offset)
1610 if (len > PAGE_SIZE - offset)
1611 return PAGE_SIZE - offset;
1616 static int __kvm_read_guest_page(struct kvm_memory_slot *slot, gfn_t gfn,
1617 void *data, int offset, int len)
1622 addr = gfn_to_hva_memslot_prot(slot, gfn, NULL);
1623 if (kvm_is_error_hva(addr))
1625 r = __copy_from_user(data, (void __user *)addr + offset, len);
1631 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1634 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1636 return __kvm_read_guest_page(slot, gfn, data, offset, len);
1638 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1640 int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data,
1641 int offset, int len)
1643 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1645 return __kvm_read_guest_page(slot, gfn, data, offset, len);
1647 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page);
1649 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1651 gfn_t gfn = gpa >> PAGE_SHIFT;
1653 int offset = offset_in_page(gpa);
1656 while ((seg = next_segment(len, offset)) != 0) {
1657 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1667 EXPORT_SYMBOL_GPL(kvm_read_guest);
1669 int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data, unsigned long len)
1671 gfn_t gfn = gpa >> PAGE_SHIFT;
1673 int offset = offset_in_page(gpa);
1676 while ((seg = next_segment(len, offset)) != 0) {
1677 ret = kvm_vcpu_read_guest_page(vcpu, gfn, data, offset, seg);
1687 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest);
1689 static int __kvm_read_guest_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
1690 void *data, int offset, unsigned long len)
1695 addr = gfn_to_hva_memslot_prot(slot, gfn, NULL);
1696 if (kvm_is_error_hva(addr))
1698 pagefault_disable();
1699 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1706 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1709 gfn_t gfn = gpa >> PAGE_SHIFT;
1710 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1711 int offset = offset_in_page(gpa);
1713 return __kvm_read_guest_atomic(slot, gfn, data, offset, len);
1715 EXPORT_SYMBOL_GPL(kvm_read_guest_atomic);
1717 int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa,
1718 void *data, unsigned long len)
1720 gfn_t gfn = gpa >> PAGE_SHIFT;
1721 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1722 int offset = offset_in_page(gpa);
1724 return __kvm_read_guest_atomic(slot, gfn, data, offset, len);
1726 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic);
1728 static int __kvm_write_guest_page(struct kvm_memory_slot *memslot, gfn_t gfn,
1729 const void *data, int offset, int len)
1734 addr = gfn_to_hva_memslot(memslot, gfn);
1735 if (kvm_is_error_hva(addr))
1737 r = __copy_to_user((void __user *)addr + offset, data, len);
1740 mark_page_dirty_in_slot(memslot, gfn);
1744 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn,
1745 const void *data, int offset, int len)
1747 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1749 return __kvm_write_guest_page(slot, gfn, data, offset, len);
1751 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1753 int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn,
1754 const void *data, int offset, int len)
1756 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1758 return __kvm_write_guest_page(slot, gfn, data, offset, len);
1760 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page);
1762 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1765 gfn_t gfn = gpa >> PAGE_SHIFT;
1767 int offset = offset_in_page(gpa);
1770 while ((seg = next_segment(len, offset)) != 0) {
1771 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1781 EXPORT_SYMBOL_GPL(kvm_write_guest);
1783 int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data,
1786 gfn_t gfn = gpa >> PAGE_SHIFT;
1788 int offset = offset_in_page(gpa);
1791 while ((seg = next_segment(len, offset)) != 0) {
1792 ret = kvm_vcpu_write_guest_page(vcpu, gfn, data, offset, seg);
1802 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest);
1804 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1805 gpa_t gpa, unsigned long len)
1807 struct kvm_memslots *slots = kvm_memslots(kvm);
1808 int offset = offset_in_page(gpa);
1809 gfn_t start_gfn = gpa >> PAGE_SHIFT;
1810 gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT;
1811 gfn_t nr_pages_needed = end_gfn - start_gfn + 1;
1812 gfn_t nr_pages_avail;
1815 ghc->generation = slots->generation;
1817 ghc->memslot = gfn_to_memslot(kvm, start_gfn);
1818 ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, NULL);
1819 if (!kvm_is_error_hva(ghc->hva) && nr_pages_needed <= 1) {
1823 * If the requested region crosses two memslots, we still
1824 * verify that the entire region is valid here.
1826 while (start_gfn <= end_gfn) {
1827 ghc->memslot = gfn_to_memslot(kvm, start_gfn);
1828 ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn,
1830 if (kvm_is_error_hva(ghc->hva))
1832 start_gfn += nr_pages_avail;
1834 /* Use the slow path for cross page reads and writes. */
1835 ghc->memslot = NULL;
1839 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
1841 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1842 void *data, unsigned long len)
1844 struct kvm_memslots *slots = kvm_memslots(kvm);
1847 BUG_ON(len > ghc->len);
1849 if (slots->generation != ghc->generation)
1850 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len);
1852 if (unlikely(!ghc->memslot))
1853 return kvm_write_guest(kvm, ghc->gpa, data, len);
1855 if (kvm_is_error_hva(ghc->hva))
1858 r = __copy_to_user((void __user *)ghc->hva, data, len);
1861 mark_page_dirty_in_slot(ghc->memslot, ghc->gpa >> PAGE_SHIFT);
1865 EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
1867 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1868 void *data, unsigned long len)
1870 struct kvm_memslots *slots = kvm_memslots(kvm);
1873 BUG_ON(len > ghc->len);
1875 if (slots->generation != ghc->generation)
1876 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len);
1878 if (unlikely(!ghc->memslot))
1879 return kvm_read_guest(kvm, ghc->gpa, data, len);
1881 if (kvm_is_error_hva(ghc->hva))
1884 r = __copy_from_user(data, (void __user *)ghc->hva, len);
1890 EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
1892 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1894 const void *zero_page = (const void *) __va(page_to_phys(ZERO_PAGE(0)));
1896 return kvm_write_guest_page(kvm, gfn, zero_page, offset, len);
1898 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1900 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1902 gfn_t gfn = gpa >> PAGE_SHIFT;
1904 int offset = offset_in_page(gpa);
1907 while ((seg = next_segment(len, offset)) != 0) {
1908 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1917 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1919 static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot,
1922 if (memslot && memslot->dirty_bitmap) {
1923 unsigned long rel_gfn = gfn - memslot->base_gfn;
1925 set_bit_le(rel_gfn, memslot->dirty_bitmap);
1929 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1931 struct kvm_memory_slot *memslot;
1933 memslot = gfn_to_memslot(kvm, gfn);
1934 mark_page_dirty_in_slot(memslot, gfn);
1936 EXPORT_SYMBOL_GPL(mark_page_dirty);
1938 void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn)
1940 struct kvm_memory_slot *memslot;
1942 memslot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1943 mark_page_dirty_in_slot(memslot, gfn);
1945 EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty);
1947 static void grow_halt_poll_ns(struct kvm_vcpu *vcpu)
1949 unsigned int old, val, grow;
1951 old = val = vcpu->halt_poll_ns;
1952 grow = READ_ONCE(halt_poll_ns_grow);
1954 if (val == 0 && grow)
1959 if (val > halt_poll_ns)
1962 vcpu->halt_poll_ns = val;
1963 trace_kvm_halt_poll_ns_grow(vcpu->vcpu_id, val, old);
1966 static void shrink_halt_poll_ns(struct kvm_vcpu *vcpu)
1968 unsigned int old, val, shrink;
1970 old = val = vcpu->halt_poll_ns;
1971 shrink = READ_ONCE(halt_poll_ns_shrink);
1977 vcpu->halt_poll_ns = val;
1978 trace_kvm_halt_poll_ns_shrink(vcpu->vcpu_id, val, old);
1981 static int kvm_vcpu_check_block(struct kvm_vcpu *vcpu)
1983 if (kvm_arch_vcpu_runnable(vcpu)) {
1984 kvm_make_request(KVM_REQ_UNHALT, vcpu);
1987 if (kvm_cpu_has_pending_timer(vcpu))
1989 if (signal_pending(current))
1996 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1998 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
2001 DECLARE_SWAITQUEUE(wait);
2002 bool waited = false;
2005 start = cur = ktime_get();
2006 if (vcpu->halt_poll_ns) {
2007 ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
2009 ++vcpu->stat.halt_attempted_poll;
2012 * This sets KVM_REQ_UNHALT if an interrupt
2015 if (kvm_vcpu_check_block(vcpu) < 0) {
2016 ++vcpu->stat.halt_successful_poll;
2020 } while (single_task_running() && ktime_before(cur, stop));
2023 kvm_arch_vcpu_blocking(vcpu);
2026 prepare_to_swait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
2028 if (kvm_vcpu_check_block(vcpu) < 0)
2035 finish_swait(&vcpu->wq, &wait);
2038 kvm_arch_vcpu_unblocking(vcpu);
2040 block_ns = ktime_to_ns(cur) - ktime_to_ns(start);
2043 if (block_ns <= vcpu->halt_poll_ns)
2045 /* we had a long block, shrink polling */
2046 else if (vcpu->halt_poll_ns && block_ns > halt_poll_ns)
2047 shrink_halt_poll_ns(vcpu);
2048 /* we had a short halt and our poll time is too small */
2049 else if (vcpu->halt_poll_ns < halt_poll_ns &&
2050 block_ns < halt_poll_ns)
2051 grow_halt_poll_ns(vcpu);
2053 vcpu->halt_poll_ns = 0;
2055 trace_kvm_vcpu_wakeup(block_ns, waited);
2057 EXPORT_SYMBOL_GPL(kvm_vcpu_block);
2061 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
2063 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
2066 int cpu = vcpu->cpu;
2067 struct swait_queue_head *wqp;
2069 wqp = kvm_arch_vcpu_wq(vcpu);
2070 if (swait_active(wqp)) {
2072 ++vcpu->stat.halt_wakeup;
2076 if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
2077 if (kvm_arch_vcpu_should_kick(vcpu))
2078 smp_send_reschedule(cpu);
2081 EXPORT_SYMBOL_GPL(kvm_vcpu_kick);
2082 #endif /* !CONFIG_S390 */
2084 int kvm_vcpu_yield_to(struct kvm_vcpu *target)
2087 struct task_struct *task = NULL;
2091 pid = rcu_dereference(target->pid);
2093 task = get_pid_task(pid, PIDTYPE_PID);
2097 ret = yield_to(task, 1);
2098 put_task_struct(task);
2102 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to);
2105 * Helper that checks whether a VCPU is eligible for directed yield.
2106 * Most eligible candidate to yield is decided by following heuristics:
2108 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
2109 * (preempted lock holder), indicated by @in_spin_loop.
2110 * Set at the beiginning and cleared at the end of interception/PLE handler.
2112 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
2113 * chance last time (mostly it has become eligible now since we have probably
2114 * yielded to lockholder in last iteration. This is done by toggling
2115 * @dy_eligible each time a VCPU checked for eligibility.)
2117 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
2118 * to preempted lock-holder could result in wrong VCPU selection and CPU
2119 * burning. Giving priority for a potential lock-holder increases lock
2122 * Since algorithm is based on heuristics, accessing another VCPU data without
2123 * locking does not harm. It may result in trying to yield to same VCPU, fail
2124 * and continue with next VCPU and so on.
2126 static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu)
2128 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
2131 eligible = !vcpu->spin_loop.in_spin_loop ||
2132 vcpu->spin_loop.dy_eligible;
2134 if (vcpu->spin_loop.in_spin_loop)
2135 kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible);
2143 void kvm_vcpu_on_spin(struct kvm_vcpu *me)
2145 struct kvm *kvm = me->kvm;
2146 struct kvm_vcpu *vcpu;
2147 int last_boosted_vcpu = me->kvm->last_boosted_vcpu;
2153 kvm_vcpu_set_in_spin_loop(me, true);
2155 * We boost the priority of a VCPU that is runnable but not
2156 * currently running, because it got preempted by something
2157 * else and called schedule in __vcpu_run. Hopefully that
2158 * VCPU is holding the lock that we need and will release it.
2159 * We approximate round-robin by starting at the last boosted VCPU.
2161 for (pass = 0; pass < 2 && !yielded && try; pass++) {
2162 kvm_for_each_vcpu(i, vcpu, kvm) {
2163 if (!pass && i <= last_boosted_vcpu) {
2164 i = last_boosted_vcpu;
2166 } else if (pass && i > last_boosted_vcpu)
2168 if (!ACCESS_ONCE(vcpu->preempted))
2172 if (swait_active(&vcpu->wq) && !kvm_arch_vcpu_runnable(vcpu))
2174 if (!kvm_vcpu_eligible_for_directed_yield(vcpu))
2177 yielded = kvm_vcpu_yield_to(vcpu);
2179 kvm->last_boosted_vcpu = i;
2181 } else if (yielded < 0) {
2188 kvm_vcpu_set_in_spin_loop(me, false);
2190 /* Ensure vcpu is not eligible during next spinloop */
2191 kvm_vcpu_set_dy_eligible(me, false);
2193 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
2195 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2197 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
2200 if (vmf->pgoff == 0)
2201 page = virt_to_page(vcpu->run);
2203 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
2204 page = virt_to_page(vcpu->arch.pio_data);
2206 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2207 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
2208 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
2211 return kvm_arch_vcpu_fault(vcpu, vmf);
2217 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
2218 .fault = kvm_vcpu_fault,
2221 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
2223 vma->vm_ops = &kvm_vcpu_vm_ops;
2227 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
2229 struct kvm_vcpu *vcpu = filp->private_data;
2231 kvm_put_kvm(vcpu->kvm);
2235 static struct file_operations kvm_vcpu_fops = {
2236 .release = kvm_vcpu_release,
2237 .unlocked_ioctl = kvm_vcpu_ioctl,
2238 #ifdef CONFIG_KVM_COMPAT
2239 .compat_ioctl = kvm_vcpu_compat_ioctl,
2241 .mmap = kvm_vcpu_mmap,
2242 .llseek = noop_llseek,
2246 * Allocates an inode for the vcpu.
2248 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
2250 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC);
2254 * Creates some virtual cpus. Good luck creating more than one.
2256 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
2259 struct kvm_vcpu *vcpu;
2261 if (id >= KVM_MAX_VCPUS)
2264 vcpu = kvm_arch_vcpu_create(kvm, id);
2266 return PTR_ERR(vcpu);
2268 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
2270 r = kvm_arch_vcpu_setup(vcpu);
2274 mutex_lock(&kvm->lock);
2275 if (!kvm_vcpu_compatible(vcpu)) {
2277 goto unlock_vcpu_destroy;
2279 if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
2281 goto unlock_vcpu_destroy;
2283 if (kvm_get_vcpu_by_id(kvm, id)) {
2285 goto unlock_vcpu_destroy;
2288 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
2290 /* Now it's all set up, let userspace reach it */
2292 r = create_vcpu_fd(vcpu);
2295 goto unlock_vcpu_destroy;
2298 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
2301 * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus
2302 * before kvm->online_vcpu's incremented value.
2305 atomic_inc(&kvm->online_vcpus);
2307 mutex_unlock(&kvm->lock);
2308 kvm_arch_vcpu_postcreate(vcpu);
2311 unlock_vcpu_destroy:
2312 mutex_unlock(&kvm->lock);
2314 kvm_arch_vcpu_destroy(vcpu);
2318 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
2321 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
2322 vcpu->sigset_active = 1;
2323 vcpu->sigset = *sigset;
2325 vcpu->sigset_active = 0;
2329 static long kvm_vcpu_ioctl(struct file *filp,
2330 unsigned int ioctl, unsigned long arg)
2332 struct kvm_vcpu *vcpu = filp->private_data;
2333 void __user *argp = (void __user *)arg;
2335 struct kvm_fpu *fpu = NULL;
2336 struct kvm_sregs *kvm_sregs = NULL;
2338 if (vcpu->kvm->mm != current->mm)
2341 if (unlikely(_IOC_TYPE(ioctl) != KVMIO))
2344 #if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS)
2346 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
2347 * so vcpu_load() would break it.
2349 if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_S390_IRQ || ioctl == KVM_INTERRUPT)
2350 return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
2354 r = vcpu_load(vcpu);
2362 if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) {
2363 /* The thread running this VCPU changed. */
2364 struct pid *oldpid = vcpu->pid;
2365 struct pid *newpid = get_task_pid(current, PIDTYPE_PID);
2367 rcu_assign_pointer(vcpu->pid, newpid);
2372 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
2373 trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
2375 case KVM_GET_REGS: {
2376 struct kvm_regs *kvm_regs;
2379 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
2382 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
2386 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
2393 case KVM_SET_REGS: {
2394 struct kvm_regs *kvm_regs;
2397 kvm_regs = memdup_user(argp, sizeof(*kvm_regs));
2398 if (IS_ERR(kvm_regs)) {
2399 r = PTR_ERR(kvm_regs);
2402 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
2406 case KVM_GET_SREGS: {
2407 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
2411 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
2415 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
2420 case KVM_SET_SREGS: {
2421 kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs));
2422 if (IS_ERR(kvm_sregs)) {
2423 r = PTR_ERR(kvm_sregs);
2427 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
2430 case KVM_GET_MP_STATE: {
2431 struct kvm_mp_state mp_state;
2433 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
2437 if (copy_to_user(argp, &mp_state, sizeof(mp_state)))
2442 case KVM_SET_MP_STATE: {
2443 struct kvm_mp_state mp_state;
2446 if (copy_from_user(&mp_state, argp, sizeof(mp_state)))
2448 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
2451 case KVM_TRANSLATE: {
2452 struct kvm_translation tr;
2455 if (copy_from_user(&tr, argp, sizeof(tr)))
2457 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
2461 if (copy_to_user(argp, &tr, sizeof(tr)))
2466 case KVM_SET_GUEST_DEBUG: {
2467 struct kvm_guest_debug dbg;
2470 if (copy_from_user(&dbg, argp, sizeof(dbg)))
2472 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
2475 case KVM_SET_SIGNAL_MASK: {
2476 struct kvm_signal_mask __user *sigmask_arg = argp;
2477 struct kvm_signal_mask kvm_sigmask;
2478 sigset_t sigset, *p;
2483 if (copy_from_user(&kvm_sigmask, argp,
2484 sizeof(kvm_sigmask)))
2487 if (kvm_sigmask.len != sizeof(sigset))
2490 if (copy_from_user(&sigset, sigmask_arg->sigset,
2495 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
2499 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
2503 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
2507 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
2513 fpu = memdup_user(argp, sizeof(*fpu));
2519 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
2523 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
2532 #ifdef CONFIG_KVM_COMPAT
2533 static long kvm_vcpu_compat_ioctl(struct file *filp,
2534 unsigned int ioctl, unsigned long arg)
2536 struct kvm_vcpu *vcpu = filp->private_data;
2537 void __user *argp = compat_ptr(arg);
2540 if (vcpu->kvm->mm != current->mm)
2544 case KVM_SET_SIGNAL_MASK: {
2545 struct kvm_signal_mask __user *sigmask_arg = argp;
2546 struct kvm_signal_mask kvm_sigmask;
2547 compat_sigset_t csigset;
2552 if (copy_from_user(&kvm_sigmask, argp,
2553 sizeof(kvm_sigmask)))
2556 if (kvm_sigmask.len != sizeof(csigset))
2559 if (copy_from_user(&csigset, sigmask_arg->sigset,
2562 sigset_from_compat(&sigset, &csigset);
2563 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2565 r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL);
2569 r = kvm_vcpu_ioctl(filp, ioctl, arg);
2577 static int kvm_device_ioctl_attr(struct kvm_device *dev,
2578 int (*accessor)(struct kvm_device *dev,
2579 struct kvm_device_attr *attr),
2582 struct kvm_device_attr attr;
2587 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
2590 return accessor(dev, &attr);
2593 static long kvm_device_ioctl(struct file *filp, unsigned int ioctl,
2596 struct kvm_device *dev = filp->private_data;
2599 case KVM_SET_DEVICE_ATTR:
2600 return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg);
2601 case KVM_GET_DEVICE_ATTR:
2602 return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg);
2603 case KVM_HAS_DEVICE_ATTR:
2604 return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg);
2606 if (dev->ops->ioctl)
2607 return dev->ops->ioctl(dev, ioctl, arg);
2613 static int kvm_device_release(struct inode *inode, struct file *filp)
2615 struct kvm_device *dev = filp->private_data;
2616 struct kvm *kvm = dev->kvm;
2622 static const struct file_operations kvm_device_fops = {
2623 .unlocked_ioctl = kvm_device_ioctl,
2624 #ifdef CONFIG_KVM_COMPAT
2625 .compat_ioctl = kvm_device_ioctl,
2627 .release = kvm_device_release,
2630 struct kvm_device *kvm_device_from_filp(struct file *filp)
2632 if (filp->f_op != &kvm_device_fops)
2635 return filp->private_data;
2638 static struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = {
2639 #ifdef CONFIG_KVM_MPIC
2640 [KVM_DEV_TYPE_FSL_MPIC_20] = &kvm_mpic_ops,
2641 [KVM_DEV_TYPE_FSL_MPIC_42] = &kvm_mpic_ops,
2644 #ifdef CONFIG_KVM_XICS
2645 [KVM_DEV_TYPE_XICS] = &kvm_xics_ops,
2649 int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type)
2651 if (type >= ARRAY_SIZE(kvm_device_ops_table))
2654 if (kvm_device_ops_table[type] != NULL)
2657 kvm_device_ops_table[type] = ops;
2661 void kvm_unregister_device_ops(u32 type)
2663 if (kvm_device_ops_table[type] != NULL)
2664 kvm_device_ops_table[type] = NULL;
2667 static int kvm_ioctl_create_device(struct kvm *kvm,
2668 struct kvm_create_device *cd)
2670 struct kvm_device_ops *ops = NULL;
2671 struct kvm_device *dev;
2672 bool test = cd->flags & KVM_CREATE_DEVICE_TEST;
2675 if (cd->type >= ARRAY_SIZE(kvm_device_ops_table))
2678 ops = kvm_device_ops_table[cd->type];
2685 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2692 ret = ops->create(dev, cd->type);
2698 ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR | O_CLOEXEC);
2704 list_add(&dev->vm_node, &kvm->devices);
2710 static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
2713 case KVM_CAP_USER_MEMORY:
2714 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
2715 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
2716 case KVM_CAP_INTERNAL_ERROR_DATA:
2717 #ifdef CONFIG_HAVE_KVM_MSI
2718 case KVM_CAP_SIGNAL_MSI:
2720 #ifdef CONFIG_HAVE_KVM_IRQFD
2722 case KVM_CAP_IRQFD_RESAMPLE:
2724 case KVM_CAP_IOEVENTFD_ANY_LENGTH:
2725 case KVM_CAP_CHECK_EXTENSION_VM:
2727 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2728 case KVM_CAP_IRQ_ROUTING:
2729 return KVM_MAX_IRQ_ROUTES;
2731 #if KVM_ADDRESS_SPACE_NUM > 1
2732 case KVM_CAP_MULTI_ADDRESS_SPACE:
2733 return KVM_ADDRESS_SPACE_NUM;
2738 return kvm_vm_ioctl_check_extension(kvm, arg);
2741 static long kvm_vm_ioctl(struct file *filp,
2742 unsigned int ioctl, unsigned long arg)
2744 struct kvm *kvm = filp->private_data;
2745 void __user *argp = (void __user *)arg;
2748 if (kvm->mm != current->mm)
2751 case KVM_CREATE_VCPU:
2752 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2754 case KVM_SET_USER_MEMORY_REGION: {
2755 struct kvm_userspace_memory_region kvm_userspace_mem;
2758 if (copy_from_user(&kvm_userspace_mem, argp,
2759 sizeof(kvm_userspace_mem)))
2762 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem);
2765 case KVM_GET_DIRTY_LOG: {
2766 struct kvm_dirty_log log;
2769 if (copy_from_user(&log, argp, sizeof(log)))
2771 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2774 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2775 case KVM_REGISTER_COALESCED_MMIO: {
2776 struct kvm_coalesced_mmio_zone zone;
2779 if (copy_from_user(&zone, argp, sizeof(zone)))
2781 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
2784 case KVM_UNREGISTER_COALESCED_MMIO: {
2785 struct kvm_coalesced_mmio_zone zone;
2788 if (copy_from_user(&zone, argp, sizeof(zone)))
2790 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
2795 struct kvm_irqfd data;
2798 if (copy_from_user(&data, argp, sizeof(data)))
2800 r = kvm_irqfd(kvm, &data);
2803 case KVM_IOEVENTFD: {
2804 struct kvm_ioeventfd data;
2807 if (copy_from_user(&data, argp, sizeof(data)))
2809 r = kvm_ioeventfd(kvm, &data);
2812 #ifdef CONFIG_HAVE_KVM_MSI
2813 case KVM_SIGNAL_MSI: {
2817 if (copy_from_user(&msi, argp, sizeof(msi)))
2819 r = kvm_send_userspace_msi(kvm, &msi);
2823 #ifdef __KVM_HAVE_IRQ_LINE
2824 case KVM_IRQ_LINE_STATUS:
2825 case KVM_IRQ_LINE: {
2826 struct kvm_irq_level irq_event;
2829 if (copy_from_user(&irq_event, argp, sizeof(irq_event)))
2832 r = kvm_vm_ioctl_irq_line(kvm, &irq_event,
2833 ioctl == KVM_IRQ_LINE_STATUS);
2838 if (ioctl == KVM_IRQ_LINE_STATUS) {
2839 if (copy_to_user(argp, &irq_event, sizeof(irq_event)))
2847 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2848 case KVM_SET_GSI_ROUTING: {
2849 struct kvm_irq_routing routing;
2850 struct kvm_irq_routing __user *urouting;
2851 struct kvm_irq_routing_entry *entries;
2854 if (copy_from_user(&routing, argp, sizeof(routing)))
2857 if (routing.nr >= KVM_MAX_IRQ_ROUTES)
2862 entries = vmalloc(routing.nr * sizeof(*entries));
2867 if (copy_from_user(entries, urouting->entries,
2868 routing.nr * sizeof(*entries)))
2869 goto out_free_irq_routing;
2870 r = kvm_set_irq_routing(kvm, entries, routing.nr,
2872 out_free_irq_routing:
2876 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
2877 case KVM_CREATE_DEVICE: {
2878 struct kvm_create_device cd;
2881 if (copy_from_user(&cd, argp, sizeof(cd)))
2884 r = kvm_ioctl_create_device(kvm, &cd);
2889 if (copy_to_user(argp, &cd, sizeof(cd)))
2895 case KVM_CHECK_EXTENSION:
2896 r = kvm_vm_ioctl_check_extension_generic(kvm, arg);
2899 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
2905 #ifdef CONFIG_KVM_COMPAT
2906 struct compat_kvm_dirty_log {
2910 compat_uptr_t dirty_bitmap; /* one bit per page */
2915 static long kvm_vm_compat_ioctl(struct file *filp,
2916 unsigned int ioctl, unsigned long arg)
2918 struct kvm *kvm = filp->private_data;
2921 if (kvm->mm != current->mm)
2924 case KVM_GET_DIRTY_LOG: {
2925 struct compat_kvm_dirty_log compat_log;
2926 struct kvm_dirty_log log;
2929 if (copy_from_user(&compat_log, (void __user *)arg,
2930 sizeof(compat_log)))
2932 log.slot = compat_log.slot;
2933 log.padding1 = compat_log.padding1;
2934 log.padding2 = compat_log.padding2;
2935 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
2937 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2941 r = kvm_vm_ioctl(filp, ioctl, arg);
2949 static struct file_operations kvm_vm_fops = {
2950 .release = kvm_vm_release,
2951 .unlocked_ioctl = kvm_vm_ioctl,
2952 #ifdef CONFIG_KVM_COMPAT
2953 .compat_ioctl = kvm_vm_compat_ioctl,
2955 .llseek = noop_llseek,
2958 static int kvm_dev_ioctl_create_vm(unsigned long type)
2963 kvm = kvm_create_vm(type);
2965 return PTR_ERR(kvm);
2966 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2967 r = kvm_coalesced_mmio_init(kvm);
2973 r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR | O_CLOEXEC);
2980 static long kvm_dev_ioctl(struct file *filp,
2981 unsigned int ioctl, unsigned long arg)
2986 case KVM_GET_API_VERSION:
2989 r = KVM_API_VERSION;
2992 r = kvm_dev_ioctl_create_vm(arg);
2994 case KVM_CHECK_EXTENSION:
2995 r = kvm_vm_ioctl_check_extension_generic(NULL, arg);
2997 case KVM_GET_VCPU_MMAP_SIZE:
3000 r = PAGE_SIZE; /* struct kvm_run */
3002 r += PAGE_SIZE; /* pio data page */
3004 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
3005 r += PAGE_SIZE; /* coalesced mmio ring page */
3008 case KVM_TRACE_ENABLE:
3009 case KVM_TRACE_PAUSE:
3010 case KVM_TRACE_DISABLE:
3014 return kvm_arch_dev_ioctl(filp, ioctl, arg);
3020 static struct file_operations kvm_chardev_ops = {
3021 .unlocked_ioctl = kvm_dev_ioctl,
3022 .compat_ioctl = kvm_dev_ioctl,
3023 .llseek = noop_llseek,
3026 static struct miscdevice kvm_dev = {
3032 static void hardware_enable_nolock(void *junk)
3034 int cpu = raw_smp_processor_id();
3037 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
3040 cpumask_set_cpu(cpu, cpus_hardware_enabled);
3042 r = kvm_arch_hardware_enable();
3045 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
3046 atomic_inc(&hardware_enable_failed);
3047 pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu);
3051 static void hardware_enable(void)
3053 raw_spin_lock(&kvm_count_lock);
3054 if (kvm_usage_count)
3055 hardware_enable_nolock(NULL);
3056 raw_spin_unlock(&kvm_count_lock);
3059 static void hardware_disable_nolock(void *junk)
3061 int cpu = raw_smp_processor_id();
3063 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
3065 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
3066 kvm_arch_hardware_disable();
3069 static void hardware_disable(void)
3071 raw_spin_lock(&kvm_count_lock);
3072 if (kvm_usage_count)
3073 hardware_disable_nolock(NULL);
3074 raw_spin_unlock(&kvm_count_lock);
3077 static void hardware_disable_all_nolock(void)
3079 BUG_ON(!kvm_usage_count);
3082 if (!kvm_usage_count)
3083 on_each_cpu(hardware_disable_nolock, NULL, 1);
3086 static void hardware_disable_all(void)
3088 raw_spin_lock(&kvm_count_lock);
3089 hardware_disable_all_nolock();
3090 raw_spin_unlock(&kvm_count_lock);
3093 static int hardware_enable_all(void)
3097 raw_spin_lock(&kvm_count_lock);
3100 if (kvm_usage_count == 1) {
3101 atomic_set(&hardware_enable_failed, 0);
3102 on_each_cpu(hardware_enable_nolock, NULL, 1);
3104 if (atomic_read(&hardware_enable_failed)) {
3105 hardware_disable_all_nolock();
3110 raw_spin_unlock(&kvm_count_lock);
3115 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
3118 val &= ~CPU_TASKS_FROZEN;
3130 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
3134 * Some (well, at least mine) BIOSes hang on reboot if
3137 * And Intel TXT required VMX off for all cpu when system shutdown.
3139 pr_info("kvm: exiting hardware virtualization\n");
3140 kvm_rebooting = true;
3141 on_each_cpu(hardware_disable_nolock, NULL, 1);
3145 static struct notifier_block kvm_reboot_notifier = {
3146 .notifier_call = kvm_reboot,
3150 static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
3154 for (i = 0; i < bus->dev_count; i++) {
3155 struct kvm_io_device *pos = bus->range[i].dev;
3157 kvm_iodevice_destructor(pos);
3162 static inline int kvm_io_bus_cmp(const struct kvm_io_range *r1,
3163 const struct kvm_io_range *r2)
3165 gpa_t addr1 = r1->addr;
3166 gpa_t addr2 = r2->addr;
3171 /* If r2->len == 0, match the exact address. If r2->len != 0,
3172 * accept any overlapping write. Any order is acceptable for
3173 * overlapping ranges, because kvm_io_bus_get_first_dev ensures
3174 * we process all of them.
3187 static int kvm_io_bus_sort_cmp(const void *p1, const void *p2)
3189 return kvm_io_bus_cmp(p1, p2);
3192 static int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev,
3193 gpa_t addr, int len)
3195 bus->range[bus->dev_count++] = (struct kvm_io_range) {
3201 sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range),
3202 kvm_io_bus_sort_cmp, NULL);
3207 static int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus,
3208 gpa_t addr, int len)
3210 struct kvm_io_range *range, key;
3213 key = (struct kvm_io_range) {
3218 range = bsearch(&key, bus->range, bus->dev_count,
3219 sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp);
3223 off = range - bus->range;
3225 while (off > 0 && kvm_io_bus_cmp(&key, &bus->range[off-1]) == 0)
3231 static int __kvm_io_bus_write(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus,
3232 struct kvm_io_range *range, const void *val)
3236 idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
3240 while (idx < bus->dev_count &&
3241 kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
3242 if (!kvm_iodevice_write(vcpu, bus->range[idx].dev, range->addr,
3251 /* kvm_io_bus_write - called under kvm->slots_lock */
3252 int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
3253 int len, const void *val)
3255 struct kvm_io_bus *bus;
3256 struct kvm_io_range range;
3259 range = (struct kvm_io_range) {
3264 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3265 r = __kvm_io_bus_write(vcpu, bus, &range, val);
3266 return r < 0 ? r : 0;
3269 /* kvm_io_bus_write_cookie - called under kvm->slots_lock */
3270 int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx,
3271 gpa_t addr, int len, const void *val, long cookie)
3273 struct kvm_io_bus *bus;
3274 struct kvm_io_range range;
3276 range = (struct kvm_io_range) {
3281 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3283 /* First try the device referenced by cookie. */
3284 if ((cookie >= 0) && (cookie < bus->dev_count) &&
3285 (kvm_io_bus_cmp(&range, &bus->range[cookie]) == 0))
3286 if (!kvm_iodevice_write(vcpu, bus->range[cookie].dev, addr, len,
3291 * cookie contained garbage; fall back to search and return the
3292 * correct cookie value.
3294 return __kvm_io_bus_write(vcpu, bus, &range, val);
3297 static int __kvm_io_bus_read(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus,
3298 struct kvm_io_range *range, void *val)
3302 idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
3306 while (idx < bus->dev_count &&
3307 kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
3308 if (!kvm_iodevice_read(vcpu, bus->range[idx].dev, range->addr,
3316 EXPORT_SYMBOL_GPL(kvm_io_bus_write);
3318 /* kvm_io_bus_read - called under kvm->slots_lock */
3319 int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
3322 struct kvm_io_bus *bus;
3323 struct kvm_io_range range;
3326 range = (struct kvm_io_range) {
3331 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3332 r = __kvm_io_bus_read(vcpu, bus, &range, val);
3333 return r < 0 ? r : 0;
3337 /* Caller must hold slots_lock. */
3338 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
3339 int len, struct kvm_io_device *dev)
3341 struct kvm_io_bus *new_bus, *bus;
3343 bus = kvm->buses[bus_idx];
3344 /* exclude ioeventfd which is limited by maximum fd */
3345 if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1)
3348 new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count + 1) *
3349 sizeof(struct kvm_io_range)), GFP_KERNEL);
3352 memcpy(new_bus, bus, sizeof(*bus) + (bus->dev_count *
3353 sizeof(struct kvm_io_range)));
3354 kvm_io_bus_insert_dev(new_bus, dev, addr, len);
3355 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
3356 synchronize_srcu_expedited(&kvm->srcu);
3362 /* Caller must hold slots_lock. */
3363 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
3364 struct kvm_io_device *dev)
3367 struct kvm_io_bus *new_bus, *bus;
3369 bus = kvm->buses[bus_idx];
3371 for (i = 0; i < bus->dev_count; i++)
3372 if (bus->range[i].dev == dev) {
3380 new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count - 1) *
3381 sizeof(struct kvm_io_range)), GFP_KERNEL);
3385 memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range));
3386 new_bus->dev_count--;
3387 memcpy(new_bus->range + i, bus->range + i + 1,
3388 (new_bus->dev_count - i) * sizeof(struct kvm_io_range));
3390 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
3391 synchronize_srcu_expedited(&kvm->srcu);
3396 static struct notifier_block kvm_cpu_notifier = {
3397 .notifier_call = kvm_cpu_hotplug,
3400 static int vm_stat_get(void *_offset, u64 *val)
3402 unsigned offset = (long)_offset;
3406 spin_lock(&kvm_lock);
3407 list_for_each_entry(kvm, &vm_list, vm_list)
3408 *val += *(u32 *)((void *)kvm + offset);
3409 spin_unlock(&kvm_lock);
3413 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
3415 static int vcpu_stat_get(void *_offset, u64 *val)
3417 unsigned offset = (long)_offset;
3419 struct kvm_vcpu *vcpu;
3423 spin_lock(&kvm_lock);
3424 list_for_each_entry(kvm, &vm_list, vm_list)
3425 kvm_for_each_vcpu(i, vcpu, kvm)
3426 *val += *(u32 *)((void *)vcpu + offset);
3428 spin_unlock(&kvm_lock);
3432 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
3434 static const struct file_operations *stat_fops[] = {
3435 [KVM_STAT_VCPU] = &vcpu_stat_fops,
3436 [KVM_STAT_VM] = &vm_stat_fops,
3439 static int kvm_init_debug(void)
3442 struct kvm_stats_debugfs_item *p;
3444 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
3445 if (kvm_debugfs_dir == NULL)
3448 for (p = debugfs_entries; p->name; ++p) {
3449 if (!debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
3450 (void *)(long)p->offset,
3451 stat_fops[p->kind]))
3458 debugfs_remove_recursive(kvm_debugfs_dir);
3463 static int kvm_suspend(void)
3465 if (kvm_usage_count)
3466 hardware_disable_nolock(NULL);
3470 static void kvm_resume(void)
3472 if (kvm_usage_count) {
3473 WARN_ON(raw_spin_is_locked(&kvm_count_lock));
3474 hardware_enable_nolock(NULL);
3478 static struct syscore_ops kvm_syscore_ops = {
3479 .suspend = kvm_suspend,
3480 .resume = kvm_resume,
3484 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
3486 return container_of(pn, struct kvm_vcpu, preempt_notifier);
3489 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
3491 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3493 if (vcpu->preempted)
3494 vcpu->preempted = false;
3496 kvm_arch_sched_in(vcpu, cpu);
3498 kvm_arch_vcpu_load(vcpu, cpu);
3501 static void kvm_sched_out(struct preempt_notifier *pn,
3502 struct task_struct *next)
3504 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3506 if (current->state == TASK_RUNNING)
3507 vcpu->preempted = true;
3508 kvm_arch_vcpu_put(vcpu);
3511 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
3512 struct module *module)
3517 r = kvm_arch_init(opaque);
3522 * kvm_arch_init makes sure there's at most one caller
3523 * for architectures that support multiple implementations,
3524 * like intel and amd on x86.
3525 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
3526 * conflicts in case kvm is already setup for another implementation.
3528 r = kvm_irqfd_init();
3532 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
3537 r = kvm_arch_hardware_setup();
3541 for_each_online_cpu(cpu) {
3542 smp_call_function_single(cpu,
3543 kvm_arch_check_processor_compat,
3549 r = register_cpu_notifier(&kvm_cpu_notifier);
3552 register_reboot_notifier(&kvm_reboot_notifier);
3554 /* A kmem cache lets us meet the alignment requirements of fx_save. */
3556 vcpu_align = __alignof__(struct kvm_vcpu);
3557 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
3559 if (!kvm_vcpu_cache) {
3564 r = kvm_async_pf_init();
3568 kvm_chardev_ops.owner = module;
3569 kvm_vm_fops.owner = module;
3570 kvm_vcpu_fops.owner = module;
3572 r = misc_register(&kvm_dev);
3574 pr_err("kvm: misc device register failed\n");
3578 register_syscore_ops(&kvm_syscore_ops);
3580 kvm_preempt_ops.sched_in = kvm_sched_in;
3581 kvm_preempt_ops.sched_out = kvm_sched_out;
3583 r = kvm_init_debug();
3585 pr_err("kvm: create debugfs files failed\n");
3589 r = kvm_vfio_ops_init();
3595 unregister_syscore_ops(&kvm_syscore_ops);
3596 misc_deregister(&kvm_dev);
3598 kvm_async_pf_deinit();
3600 kmem_cache_destroy(kvm_vcpu_cache);
3602 unregister_reboot_notifier(&kvm_reboot_notifier);
3603 unregister_cpu_notifier(&kvm_cpu_notifier);
3606 kvm_arch_hardware_unsetup();
3608 free_cpumask_var(cpus_hardware_enabled);
3616 EXPORT_SYMBOL_GPL(kvm_init);
3620 debugfs_remove_recursive(kvm_debugfs_dir);
3621 misc_deregister(&kvm_dev);
3622 kmem_cache_destroy(kvm_vcpu_cache);
3623 kvm_async_pf_deinit();
3624 unregister_syscore_ops(&kvm_syscore_ops);
3625 unregister_reboot_notifier(&kvm_reboot_notifier);
3626 unregister_cpu_notifier(&kvm_cpu_notifier);
3627 on_each_cpu(hardware_disable_nolock, NULL, 1);
3628 kvm_arch_hardware_unsetup();
3631 free_cpumask_var(cpus_hardware_enabled);
3632 kvm_vfio_ops_exit();
3634 EXPORT_SYMBOL_GPL(kvm_exit);