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 /* halt polling only reduces halt latency by 5-7 us, 500us is enough */
70 static unsigned int halt_poll_ns = 500000;
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, int, S_IRUGO);
77 /* Default resets per-vcpu halt_poll_ns . */
78 static unsigned int halt_poll_ns_shrink;
79 module_param(halt_poll_ns_shrink, int, S_IRUGO);
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(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(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 void kvm_make_mclock_inprogress_request(struct kvm *kvm)
211 kvm_make_all_cpus_request(kvm, KVM_REQ_MCLOCK_INPROGRESS);
214 void kvm_make_scan_ioapic_request(struct kvm *kvm)
216 kvm_make_all_cpus_request(kvm, KVM_REQ_SCAN_IOAPIC);
219 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
224 mutex_init(&vcpu->mutex);
229 vcpu->halt_poll_ns = 0;
230 init_waitqueue_head(&vcpu->wq);
231 kvm_async_pf_vcpu_init(vcpu);
233 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
238 vcpu->run = page_address(page);
240 kvm_vcpu_set_in_spin_loop(vcpu, false);
241 kvm_vcpu_set_dy_eligible(vcpu, false);
242 vcpu->preempted = false;
244 r = kvm_arch_vcpu_init(vcpu);
250 free_page((unsigned long)vcpu->run);
254 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
256 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
259 kvm_arch_vcpu_uninit(vcpu);
260 free_page((unsigned long)vcpu->run);
262 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
264 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
265 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
267 return container_of(mn, struct kvm, mmu_notifier);
270 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
271 struct mm_struct *mm,
272 unsigned long address)
274 struct kvm *kvm = mmu_notifier_to_kvm(mn);
275 int need_tlb_flush, idx;
278 * When ->invalidate_page runs, the linux pte has been zapped
279 * already but the page is still allocated until
280 * ->invalidate_page returns. So if we increase the sequence
281 * here the kvm page fault will notice if the spte can't be
282 * established because the page is going to be freed. If
283 * instead the kvm page fault establishes the spte before
284 * ->invalidate_page runs, kvm_unmap_hva will release it
287 * The sequence increase only need to be seen at spin_unlock
288 * time, and not at spin_lock time.
290 * Increasing the sequence after the spin_unlock would be
291 * unsafe because the kvm page fault could then establish the
292 * pte after kvm_unmap_hva returned, without noticing the page
293 * is going to be freed.
295 idx = srcu_read_lock(&kvm->srcu);
296 spin_lock(&kvm->mmu_lock);
298 kvm->mmu_notifier_seq++;
299 need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty;
300 /* we've to flush the tlb before the pages can be freed */
302 kvm_flush_remote_tlbs(kvm);
304 spin_unlock(&kvm->mmu_lock);
306 kvm_arch_mmu_notifier_invalidate_page(kvm, address);
308 srcu_read_unlock(&kvm->srcu, idx);
311 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
312 struct mm_struct *mm,
313 unsigned long address,
316 struct kvm *kvm = mmu_notifier_to_kvm(mn);
319 idx = srcu_read_lock(&kvm->srcu);
320 spin_lock(&kvm->mmu_lock);
321 kvm->mmu_notifier_seq++;
322 kvm_set_spte_hva(kvm, address, pte);
323 spin_unlock(&kvm->mmu_lock);
324 srcu_read_unlock(&kvm->srcu, idx);
327 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
328 struct mm_struct *mm,
332 struct kvm *kvm = mmu_notifier_to_kvm(mn);
333 int need_tlb_flush = 0, idx;
335 idx = srcu_read_lock(&kvm->srcu);
336 spin_lock(&kvm->mmu_lock);
338 * The count increase must become visible at unlock time as no
339 * spte can be established without taking the mmu_lock and
340 * count is also read inside the mmu_lock critical section.
342 kvm->mmu_notifier_count++;
343 need_tlb_flush = kvm_unmap_hva_range(kvm, start, end);
344 need_tlb_flush |= kvm->tlbs_dirty;
345 /* we've to flush the tlb before the pages can be freed */
347 kvm_flush_remote_tlbs(kvm);
349 spin_unlock(&kvm->mmu_lock);
350 srcu_read_unlock(&kvm->srcu, idx);
353 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
354 struct mm_struct *mm,
358 struct kvm *kvm = mmu_notifier_to_kvm(mn);
360 spin_lock(&kvm->mmu_lock);
362 * This sequence increase will notify the kvm page fault that
363 * the page that is going to be mapped in the spte could have
366 kvm->mmu_notifier_seq++;
369 * The above sequence increase must be visible before the
370 * below count decrease, which is ensured by the smp_wmb above
371 * in conjunction with the smp_rmb in mmu_notifier_retry().
373 kvm->mmu_notifier_count--;
374 spin_unlock(&kvm->mmu_lock);
376 BUG_ON(kvm->mmu_notifier_count < 0);
379 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
380 struct mm_struct *mm,
384 struct kvm *kvm = mmu_notifier_to_kvm(mn);
387 idx = srcu_read_lock(&kvm->srcu);
388 spin_lock(&kvm->mmu_lock);
390 young = kvm_age_hva(kvm, start, end);
392 kvm_flush_remote_tlbs(kvm);
394 spin_unlock(&kvm->mmu_lock);
395 srcu_read_unlock(&kvm->srcu, idx);
400 static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn,
401 struct mm_struct *mm,
402 unsigned long address)
404 struct kvm *kvm = mmu_notifier_to_kvm(mn);
407 idx = srcu_read_lock(&kvm->srcu);
408 spin_lock(&kvm->mmu_lock);
409 young = kvm_test_age_hva(kvm, address);
410 spin_unlock(&kvm->mmu_lock);
411 srcu_read_unlock(&kvm->srcu, idx);
416 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
417 struct mm_struct *mm)
419 struct kvm *kvm = mmu_notifier_to_kvm(mn);
422 idx = srcu_read_lock(&kvm->srcu);
423 kvm_arch_flush_shadow_all(kvm);
424 srcu_read_unlock(&kvm->srcu, idx);
427 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
428 .invalidate_page = kvm_mmu_notifier_invalidate_page,
429 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
430 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
431 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
432 .test_young = kvm_mmu_notifier_test_young,
433 .change_pte = kvm_mmu_notifier_change_pte,
434 .release = kvm_mmu_notifier_release,
437 static int kvm_init_mmu_notifier(struct kvm *kvm)
439 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
440 return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
443 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
445 static int kvm_init_mmu_notifier(struct kvm *kvm)
450 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
452 static struct kvm_memslots *kvm_alloc_memslots(void)
455 struct kvm_memslots *slots;
457 slots = kvm_kvzalloc(sizeof(struct kvm_memslots));
462 * Init kvm generation close to the maximum to easily test the
463 * code of handling generation number wrap-around.
465 slots->generation = -150;
466 for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
467 slots->id_to_index[i] = slots->memslots[i].id = i;
472 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
474 if (!memslot->dirty_bitmap)
477 kvfree(memslot->dirty_bitmap);
478 memslot->dirty_bitmap = NULL;
482 * Free any memory in @free but not in @dont.
484 static void kvm_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
485 struct kvm_memory_slot *dont)
487 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
488 kvm_destroy_dirty_bitmap(free);
490 kvm_arch_free_memslot(kvm, free, dont);
495 static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots)
497 struct kvm_memory_slot *memslot;
502 kvm_for_each_memslot(memslot, slots)
503 kvm_free_memslot(kvm, memslot, NULL);
508 static struct kvm *kvm_create_vm(unsigned long type)
511 struct kvm *kvm = kvm_arch_alloc_vm();
514 return ERR_PTR(-ENOMEM);
516 r = kvm_arch_init_vm(kvm, type);
518 goto out_err_no_disable;
520 r = hardware_enable_all();
522 goto out_err_no_disable;
524 #ifdef CONFIG_HAVE_KVM_IRQFD
525 INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
528 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX);
531 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
532 kvm->memslots[i] = kvm_alloc_memslots();
533 if (!kvm->memslots[i])
534 goto out_err_no_srcu;
537 if (init_srcu_struct(&kvm->srcu))
538 goto out_err_no_srcu;
539 if (init_srcu_struct(&kvm->irq_srcu))
540 goto out_err_no_irq_srcu;
541 for (i = 0; i < KVM_NR_BUSES; i++) {
542 kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus),
548 spin_lock_init(&kvm->mmu_lock);
549 kvm->mm = current->mm;
550 atomic_inc(&kvm->mm->mm_count);
551 kvm_eventfd_init(kvm);
552 mutex_init(&kvm->lock);
553 mutex_init(&kvm->irq_lock);
554 mutex_init(&kvm->slots_lock);
555 atomic_set(&kvm->users_count, 1);
556 INIT_LIST_HEAD(&kvm->devices);
558 r = kvm_init_mmu_notifier(kvm);
562 spin_lock(&kvm_lock);
563 list_add(&kvm->vm_list, &vm_list);
564 spin_unlock(&kvm_lock);
566 preempt_notifier_inc();
571 cleanup_srcu_struct(&kvm->irq_srcu);
573 cleanup_srcu_struct(&kvm->srcu);
575 hardware_disable_all();
577 for (i = 0; i < KVM_NR_BUSES; i++)
578 kfree(kvm->buses[i]);
579 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
580 kvm_free_memslots(kvm, kvm->memslots[i]);
581 kvm_arch_free_vm(kvm);
586 * Avoid using vmalloc for a small buffer.
587 * Should not be used when the size is statically known.
589 void *kvm_kvzalloc(unsigned long size)
591 if (size > PAGE_SIZE)
592 return vzalloc(size);
594 return kzalloc(size, GFP_KERNEL);
597 static void kvm_destroy_devices(struct kvm *kvm)
599 struct list_head *node, *tmp;
601 list_for_each_safe(node, tmp, &kvm->devices) {
602 struct kvm_device *dev =
603 list_entry(node, struct kvm_device, vm_node);
606 dev->ops->destroy(dev);
610 static void kvm_destroy_vm(struct kvm *kvm)
613 struct mm_struct *mm = kvm->mm;
615 kvm_arch_sync_events(kvm);
616 spin_lock(&kvm_lock);
617 list_del(&kvm->vm_list);
618 spin_unlock(&kvm_lock);
619 kvm_free_irq_routing(kvm);
620 for (i = 0; i < KVM_NR_BUSES; i++)
621 kvm_io_bus_destroy(kvm->buses[i]);
622 kvm_coalesced_mmio_free(kvm);
623 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
624 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
626 kvm_arch_flush_shadow_all(kvm);
628 kvm_arch_destroy_vm(kvm);
629 kvm_destroy_devices(kvm);
630 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
631 kvm_free_memslots(kvm, kvm->memslots[i]);
632 cleanup_srcu_struct(&kvm->irq_srcu);
633 cleanup_srcu_struct(&kvm->srcu);
634 kvm_arch_free_vm(kvm);
635 preempt_notifier_dec();
636 hardware_disable_all();
640 void kvm_get_kvm(struct kvm *kvm)
642 atomic_inc(&kvm->users_count);
644 EXPORT_SYMBOL_GPL(kvm_get_kvm);
646 void kvm_put_kvm(struct kvm *kvm)
648 if (atomic_dec_and_test(&kvm->users_count))
651 EXPORT_SYMBOL_GPL(kvm_put_kvm);
654 static int kvm_vm_release(struct inode *inode, struct file *filp)
656 struct kvm *kvm = filp->private_data;
658 kvm_irqfd_release(kvm);
665 * Allocation size is twice as large as the actual dirty bitmap size.
666 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
668 static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
670 unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
672 memslot->dirty_bitmap = kvm_kvzalloc(dirty_bytes);
673 if (!memslot->dirty_bitmap)
680 * Insert memslot and re-sort memslots based on their GFN,
681 * so binary search could be used to lookup GFN.
682 * Sorting algorithm takes advantage of having initially
683 * sorted array and known changed memslot position.
685 static void update_memslots(struct kvm_memslots *slots,
686 struct kvm_memory_slot *new)
689 int i = slots->id_to_index[id];
690 struct kvm_memory_slot *mslots = slots->memslots;
692 WARN_ON(mslots[i].id != id);
694 WARN_ON(!mslots[i].npages);
695 if (mslots[i].npages)
698 if (!mslots[i].npages)
702 while (i < KVM_MEM_SLOTS_NUM - 1 &&
703 new->base_gfn <= mslots[i + 1].base_gfn) {
704 if (!mslots[i + 1].npages)
706 mslots[i] = mslots[i + 1];
707 slots->id_to_index[mslots[i].id] = i;
712 * The ">=" is needed when creating a slot with base_gfn == 0,
713 * so that it moves before all those with base_gfn == npages == 0.
715 * On the other hand, if new->npages is zero, the above loop has
716 * already left i pointing to the beginning of the empty part of
717 * mslots, and the ">=" would move the hole backwards in this
718 * case---which is wrong. So skip the loop when deleting a slot.
722 new->base_gfn >= mslots[i - 1].base_gfn) {
723 mslots[i] = mslots[i - 1];
724 slots->id_to_index[mslots[i].id] = i;
728 WARN_ON_ONCE(i != slots->used_slots);
731 slots->id_to_index[mslots[i].id] = i;
734 static int check_memory_region_flags(const struct kvm_userspace_memory_region *mem)
736 u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES;
738 #ifdef __KVM_HAVE_READONLY_MEM
739 valid_flags |= KVM_MEM_READONLY;
742 if (mem->flags & ~valid_flags)
748 static struct kvm_memslots *install_new_memslots(struct kvm *kvm,
749 int as_id, struct kvm_memslots *slots)
751 struct kvm_memslots *old_memslots = __kvm_memslots(kvm, as_id);
754 * Set the low bit in the generation, which disables SPTE caching
755 * until the end of synchronize_srcu_expedited.
757 WARN_ON(old_memslots->generation & 1);
758 slots->generation = old_memslots->generation + 1;
760 rcu_assign_pointer(kvm->memslots[as_id], slots);
761 synchronize_srcu_expedited(&kvm->srcu);
764 * Increment the new memslot generation a second time. This prevents
765 * vm exits that race with memslot updates from caching a memslot
766 * generation that will (potentially) be valid forever.
770 kvm_arch_memslots_updated(kvm, slots);
776 * Allocate some memory and give it an address in the guest physical address
779 * Discontiguous memory is allowed, mostly for framebuffers.
781 * Must be called holding kvm->slots_lock for write.
783 int __kvm_set_memory_region(struct kvm *kvm,
784 const struct kvm_userspace_memory_region *mem)
788 unsigned long npages;
789 struct kvm_memory_slot *slot;
790 struct kvm_memory_slot old, new;
791 struct kvm_memslots *slots = NULL, *old_memslots;
793 enum kvm_mr_change change;
795 r = check_memory_region_flags(mem);
800 as_id = mem->slot >> 16;
803 /* General sanity checks */
804 if (mem->memory_size & (PAGE_SIZE - 1))
806 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
808 /* We can read the guest memory with __xxx_user() later on. */
809 if ((id < KVM_USER_MEM_SLOTS) &&
810 ((mem->userspace_addr & (PAGE_SIZE - 1)) ||
811 !access_ok(VERIFY_WRITE,
812 (void __user *)(unsigned long)mem->userspace_addr,
815 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_MEM_SLOTS_NUM)
817 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
820 slot = id_to_memslot(__kvm_memslots(kvm, as_id), id);
821 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
822 npages = mem->memory_size >> PAGE_SHIFT;
824 if (npages > KVM_MEM_MAX_NR_PAGES)
830 new.base_gfn = base_gfn;
832 new.flags = mem->flags;
836 change = KVM_MR_CREATE;
837 else { /* Modify an existing slot. */
838 if ((mem->userspace_addr != old.userspace_addr) ||
839 (npages != old.npages) ||
840 ((new.flags ^ old.flags) & KVM_MEM_READONLY))
843 if (base_gfn != old.base_gfn)
844 change = KVM_MR_MOVE;
845 else if (new.flags != old.flags)
846 change = KVM_MR_FLAGS_ONLY;
847 else { /* Nothing to change. */
856 change = KVM_MR_DELETE;
861 if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
862 /* Check for overlaps */
864 kvm_for_each_memslot(slot, __kvm_memslots(kvm, as_id)) {
865 if ((slot->id >= KVM_USER_MEM_SLOTS) ||
868 if (!((base_gfn + npages <= slot->base_gfn) ||
869 (base_gfn >= slot->base_gfn + slot->npages)))
874 /* Free page dirty bitmap if unneeded */
875 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
876 new.dirty_bitmap = NULL;
879 if (change == KVM_MR_CREATE) {
880 new.userspace_addr = mem->userspace_addr;
882 if (kvm_arch_create_memslot(kvm, &new, npages))
886 /* Allocate page dirty bitmap if needed */
887 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
888 if (kvm_create_dirty_bitmap(&new) < 0)
892 slots = kvm_kvzalloc(sizeof(struct kvm_memslots));
895 memcpy(slots, __kvm_memslots(kvm, as_id), sizeof(struct kvm_memslots));
897 if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) {
898 slot = id_to_memslot(slots, id);
899 slot->flags |= KVM_MEMSLOT_INVALID;
901 old_memslots = install_new_memslots(kvm, as_id, slots);
903 /* slot was deleted or moved, clear iommu mapping */
904 kvm_iommu_unmap_pages(kvm, &old);
905 /* From this point no new shadow pages pointing to a deleted,
906 * or moved, memslot will be created.
908 * validation of sp->gfn happens in:
909 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
910 * - kvm_is_visible_gfn (mmu_check_roots)
912 kvm_arch_flush_shadow_memslot(kvm, slot);
915 * We can re-use the old_memslots from above, the only difference
916 * from the currently installed memslots is the invalid flag. This
917 * will get overwritten by update_memslots anyway.
919 slots = old_memslots;
922 r = kvm_arch_prepare_memory_region(kvm, &new, mem, change);
926 /* actual memory is freed via old in kvm_free_memslot below */
927 if (change == KVM_MR_DELETE) {
928 new.dirty_bitmap = NULL;
929 memset(&new.arch, 0, sizeof(new.arch));
932 update_memslots(slots, &new);
933 old_memslots = install_new_memslots(kvm, as_id, slots);
935 kvm_arch_commit_memory_region(kvm, mem, &old, &new, change);
937 kvm_free_memslot(kvm, &old, &new);
938 kvfree(old_memslots);
941 * IOMMU mapping: New slots need to be mapped. Old slots need to be
942 * un-mapped and re-mapped if their base changes. Since base change
943 * unmapping is handled above with slot deletion, mapping alone is
944 * needed here. Anything else the iommu might care about for existing
945 * slots (size changes, userspace addr changes and read-only flag
946 * changes) is disallowed above, so any other attribute changes getting
947 * here can be skipped.
949 if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
950 r = kvm_iommu_map_pages(kvm, &new);
959 kvm_free_memslot(kvm, &new, &old);
963 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
965 int kvm_set_memory_region(struct kvm *kvm,
966 const struct kvm_userspace_memory_region *mem)
970 mutex_lock(&kvm->slots_lock);
971 r = __kvm_set_memory_region(kvm, mem);
972 mutex_unlock(&kvm->slots_lock);
975 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
977 static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
978 struct kvm_userspace_memory_region *mem)
980 if ((u16)mem->slot >= KVM_USER_MEM_SLOTS)
983 return kvm_set_memory_region(kvm, mem);
986 int kvm_get_dirty_log(struct kvm *kvm,
987 struct kvm_dirty_log *log, int *is_dirty)
989 struct kvm_memslots *slots;
990 struct kvm_memory_slot *memslot;
993 unsigned long any = 0;
996 as_id = log->slot >> 16;
998 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS)
1001 slots = __kvm_memslots(kvm, as_id);
1002 memslot = id_to_memslot(slots, id);
1004 if (!memslot->dirty_bitmap)
1007 n = kvm_dirty_bitmap_bytes(memslot);
1009 for (i = 0; !any && i < n/sizeof(long); ++i)
1010 any = memslot->dirty_bitmap[i];
1013 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
1023 EXPORT_SYMBOL_GPL(kvm_get_dirty_log);
1025 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
1027 * kvm_get_dirty_log_protect - get a snapshot of dirty pages, and if any pages
1028 * are dirty write protect them for next write.
1029 * @kvm: pointer to kvm instance
1030 * @log: slot id and address to which we copy the log
1031 * @is_dirty: flag set if any page is dirty
1033 * We need to keep it in mind that VCPU threads can write to the bitmap
1034 * concurrently. So, to avoid losing track of dirty pages we keep the
1037 * 1. Take a snapshot of the bit and clear it if needed.
1038 * 2. Write protect the corresponding page.
1039 * 3. Copy the snapshot to the userspace.
1040 * 4. Upon return caller flushes TLB's if needed.
1042 * Between 2 and 4, the guest may write to the page using the remaining TLB
1043 * entry. This is not a problem because the page is reported dirty using
1044 * the snapshot taken before and step 4 ensures that writes done after
1045 * exiting to userspace will be logged for the next call.
1048 int kvm_get_dirty_log_protect(struct kvm *kvm,
1049 struct kvm_dirty_log *log, bool *is_dirty)
1051 struct kvm_memslots *slots;
1052 struct kvm_memory_slot *memslot;
1053 int r, i, as_id, id;
1055 unsigned long *dirty_bitmap;
1056 unsigned long *dirty_bitmap_buffer;
1059 as_id = log->slot >> 16;
1060 id = (u16)log->slot;
1061 if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS)
1064 slots = __kvm_memslots(kvm, as_id);
1065 memslot = id_to_memslot(slots, id);
1067 dirty_bitmap = memslot->dirty_bitmap;
1072 n = kvm_dirty_bitmap_bytes(memslot);
1074 dirty_bitmap_buffer = dirty_bitmap + n / sizeof(long);
1075 memset(dirty_bitmap_buffer, 0, n);
1077 spin_lock(&kvm->mmu_lock);
1079 for (i = 0; i < n / sizeof(long); i++) {
1083 if (!dirty_bitmap[i])
1088 mask = xchg(&dirty_bitmap[i], 0);
1089 dirty_bitmap_buffer[i] = mask;
1092 offset = i * BITS_PER_LONG;
1093 kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot,
1098 spin_unlock(&kvm->mmu_lock);
1101 if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n))
1108 EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect);
1111 bool kvm_largepages_enabled(void)
1113 return largepages_enabled;
1116 void kvm_disable_largepages(void)
1118 largepages_enabled = false;
1120 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
1122 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
1124 return __gfn_to_memslot(kvm_memslots(kvm), gfn);
1126 EXPORT_SYMBOL_GPL(gfn_to_memslot);
1128 struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn)
1130 return __gfn_to_memslot(kvm_vcpu_memslots(vcpu), gfn);
1133 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
1135 struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn);
1137 if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS ||
1138 memslot->flags & KVM_MEMSLOT_INVALID)
1143 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
1145 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
1147 struct vm_area_struct *vma;
1148 unsigned long addr, size;
1152 addr = gfn_to_hva(kvm, gfn);
1153 if (kvm_is_error_hva(addr))
1156 down_read(¤t->mm->mmap_sem);
1157 vma = find_vma(current->mm, addr);
1161 size = vma_kernel_pagesize(vma);
1164 up_read(¤t->mm->mmap_sem);
1169 static bool memslot_is_readonly(struct kvm_memory_slot *slot)
1171 return slot->flags & KVM_MEM_READONLY;
1174 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1175 gfn_t *nr_pages, bool write)
1177 if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
1178 return KVM_HVA_ERR_BAD;
1180 if (memslot_is_readonly(slot) && write)
1181 return KVM_HVA_ERR_RO_BAD;
1184 *nr_pages = slot->npages - (gfn - slot->base_gfn);
1186 return __gfn_to_hva_memslot(slot, gfn);
1189 static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1192 return __gfn_to_hva_many(slot, gfn, nr_pages, true);
1195 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot,
1198 return gfn_to_hva_many(slot, gfn, NULL);
1200 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot);
1202 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1204 return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
1206 EXPORT_SYMBOL_GPL(gfn_to_hva);
1208 unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn)
1210 return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, NULL);
1212 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva);
1215 * If writable is set to false, the hva returned by this function is only
1216 * allowed to be read.
1218 unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot,
1219 gfn_t gfn, bool *writable)
1221 unsigned long hva = __gfn_to_hva_many(slot, gfn, NULL, false);
1223 if (!kvm_is_error_hva(hva) && writable)
1224 *writable = !memslot_is_readonly(slot);
1229 unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable)
1231 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1233 return gfn_to_hva_memslot_prot(slot, gfn, writable);
1236 unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable)
1238 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1240 return gfn_to_hva_memslot_prot(slot, gfn, writable);
1243 static int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm,
1244 unsigned long start, int write, struct page **page)
1246 int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET;
1249 flags |= FOLL_WRITE;
1251 return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL);
1254 static inline int check_user_page_hwpoison(unsigned long addr)
1256 int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE;
1258 rc = __get_user_pages(current, current->mm, addr, 1,
1259 flags, NULL, NULL, NULL);
1260 return rc == -EHWPOISON;
1264 * The atomic path to get the writable pfn which will be stored in @pfn,
1265 * true indicates success, otherwise false is returned.
1267 static bool hva_to_pfn_fast(unsigned long addr, bool atomic, bool *async,
1268 bool write_fault, bool *writable, pfn_t *pfn)
1270 struct page *page[1];
1273 if (!(async || atomic))
1277 * Fast pin a writable pfn only if it is a write fault request
1278 * or the caller allows to map a writable pfn for a read fault
1281 if (!(write_fault || writable))
1284 npages = __get_user_pages_fast(addr, 1, 1, page);
1286 *pfn = page_to_pfn(page[0]);
1297 * The slow path to get the pfn of the specified host virtual address,
1298 * 1 indicates success, -errno is returned if error is detected.
1300 static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault,
1301 bool *writable, pfn_t *pfn)
1303 struct page *page[1];
1309 *writable = write_fault;
1312 down_read(¤t->mm->mmap_sem);
1313 npages = get_user_page_nowait(current, current->mm,
1314 addr, write_fault, page);
1315 up_read(¤t->mm->mmap_sem);
1317 npages = __get_user_pages_unlocked(current, current->mm, addr, 1,
1318 write_fault, 0, page,
1319 FOLL_TOUCH|FOLL_HWPOISON);
1323 /* map read fault as writable if possible */
1324 if (unlikely(!write_fault) && writable) {
1325 struct page *wpage[1];
1327 npages = __get_user_pages_fast(addr, 1, 1, wpage);
1336 *pfn = page_to_pfn(page[0]);
1340 static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault)
1342 if (unlikely(!(vma->vm_flags & VM_READ)))
1345 if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE))))
1352 * Pin guest page in memory and return its pfn.
1353 * @addr: host virtual address which maps memory to the guest
1354 * @atomic: whether this function can sleep
1355 * @async: whether this function need to wait IO complete if the
1356 * host page is not in the memory
1357 * @write_fault: whether we should get a writable host page
1358 * @writable: whether it allows to map a writable host page for !@write_fault
1360 * The function will map a writable host page for these two cases:
1361 * 1): @write_fault = true
1362 * 2): @write_fault = false && @writable, @writable will tell the caller
1363 * whether the mapping is writable.
1365 static pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async,
1366 bool write_fault, bool *writable)
1368 struct vm_area_struct *vma;
1372 /* we can do it either atomically or asynchronously, not both */
1373 BUG_ON(atomic && async);
1375 if (hva_to_pfn_fast(addr, atomic, async, write_fault, writable, &pfn))
1379 return KVM_PFN_ERR_FAULT;
1381 npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn);
1385 down_read(¤t->mm->mmap_sem);
1386 if (npages == -EHWPOISON ||
1387 (!async && check_user_page_hwpoison(addr))) {
1388 pfn = KVM_PFN_ERR_HWPOISON;
1392 vma = find_vma_intersection(current->mm, addr, addr + 1);
1395 pfn = KVM_PFN_ERR_FAULT;
1396 else if ((vma->vm_flags & VM_PFNMAP)) {
1397 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) +
1399 BUG_ON(!kvm_is_reserved_pfn(pfn));
1401 if (async && vma_is_valid(vma, write_fault))
1403 pfn = KVM_PFN_ERR_FAULT;
1406 up_read(¤t->mm->mmap_sem);
1410 pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn, bool atomic,
1411 bool *async, bool write_fault, bool *writable)
1413 unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault);
1415 if (addr == KVM_HVA_ERR_RO_BAD)
1416 return KVM_PFN_ERR_RO_FAULT;
1418 if (kvm_is_error_hva(addr))
1419 return KVM_PFN_NOSLOT;
1421 /* Do not map writable pfn in the readonly memslot. */
1422 if (writable && memslot_is_readonly(slot)) {
1427 return hva_to_pfn(addr, atomic, async, write_fault,
1430 EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot);
1432 pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1435 return __gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn, false, NULL,
1436 write_fault, writable);
1438 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
1440 pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
1442 return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL);
1444 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot);
1446 pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn)
1448 return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL);
1450 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic);
1452 pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
1454 return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm, gfn), gfn);
1456 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
1458 pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn)
1460 return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn);
1462 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic);
1464 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1466 return gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn);
1468 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1470 pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn)
1472 return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn);
1474 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn);
1476 int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
1477 struct page **pages, int nr_pages)
1482 addr = gfn_to_hva_many(slot, gfn, &entry);
1483 if (kvm_is_error_hva(addr))
1486 if (entry < nr_pages)
1489 return __get_user_pages_fast(addr, nr_pages, 1, pages);
1491 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
1493 static struct page *kvm_pfn_to_page(pfn_t pfn)
1495 if (is_error_noslot_pfn(pfn))
1496 return KVM_ERR_PTR_BAD_PAGE;
1498 if (kvm_is_reserved_pfn(pfn)) {
1500 return KVM_ERR_PTR_BAD_PAGE;
1503 return pfn_to_page(pfn);
1506 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1510 pfn = gfn_to_pfn(kvm, gfn);
1512 return kvm_pfn_to_page(pfn);
1514 EXPORT_SYMBOL_GPL(gfn_to_page);
1516 struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn)
1520 pfn = kvm_vcpu_gfn_to_pfn(vcpu, gfn);
1522 return kvm_pfn_to_page(pfn);
1524 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page);
1526 void kvm_release_page_clean(struct page *page)
1528 WARN_ON(is_error_page(page));
1530 kvm_release_pfn_clean(page_to_pfn(page));
1532 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1534 void kvm_release_pfn_clean(pfn_t pfn)
1536 if (!is_error_noslot_pfn(pfn) && !kvm_is_reserved_pfn(pfn))
1537 put_page(pfn_to_page(pfn));
1539 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1541 void kvm_release_page_dirty(struct page *page)
1543 WARN_ON(is_error_page(page));
1545 kvm_release_pfn_dirty(page_to_pfn(page));
1547 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1549 static void kvm_release_pfn_dirty(pfn_t pfn)
1551 kvm_set_pfn_dirty(pfn);
1552 kvm_release_pfn_clean(pfn);
1555 void kvm_set_pfn_dirty(pfn_t pfn)
1557 if (!kvm_is_reserved_pfn(pfn)) {
1558 struct page *page = pfn_to_page(pfn);
1560 if (!PageReserved(page))
1564 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1566 void kvm_set_pfn_accessed(pfn_t pfn)
1568 if (!kvm_is_reserved_pfn(pfn))
1569 mark_page_accessed(pfn_to_page(pfn));
1571 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1573 void kvm_get_pfn(pfn_t pfn)
1575 if (!kvm_is_reserved_pfn(pfn))
1576 get_page(pfn_to_page(pfn));
1578 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1580 static int next_segment(unsigned long len, int offset)
1582 if (len > PAGE_SIZE - offset)
1583 return PAGE_SIZE - offset;
1588 static int __kvm_read_guest_page(struct kvm_memory_slot *slot, gfn_t gfn,
1589 void *data, int offset, int len)
1594 addr = gfn_to_hva_memslot_prot(slot, gfn, NULL);
1595 if (kvm_is_error_hva(addr))
1597 r = __copy_from_user(data, (void __user *)addr + offset, len);
1603 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1606 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1608 return __kvm_read_guest_page(slot, gfn, data, offset, len);
1610 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1612 int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data,
1613 int offset, int len)
1615 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1617 return __kvm_read_guest_page(slot, gfn, data, offset, len);
1619 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page);
1621 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1623 gfn_t gfn = gpa >> PAGE_SHIFT;
1625 int offset = offset_in_page(gpa);
1628 while ((seg = next_segment(len, offset)) != 0) {
1629 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1639 EXPORT_SYMBOL_GPL(kvm_read_guest);
1641 int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data, unsigned long len)
1643 gfn_t gfn = gpa >> PAGE_SHIFT;
1645 int offset = offset_in_page(gpa);
1648 while ((seg = next_segment(len, offset)) != 0) {
1649 ret = kvm_vcpu_read_guest_page(vcpu, gfn, data, offset, seg);
1659 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest);
1661 static int __kvm_read_guest_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
1662 void *data, int offset, unsigned long len)
1667 addr = gfn_to_hva_memslot_prot(slot, gfn, NULL);
1668 if (kvm_is_error_hva(addr))
1670 pagefault_disable();
1671 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1678 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1681 gfn_t gfn = gpa >> PAGE_SHIFT;
1682 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1683 int offset = offset_in_page(gpa);
1685 return __kvm_read_guest_atomic(slot, gfn, data, offset, len);
1687 EXPORT_SYMBOL_GPL(kvm_read_guest_atomic);
1689 int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa,
1690 void *data, unsigned long len)
1692 gfn_t gfn = gpa >> PAGE_SHIFT;
1693 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1694 int offset = offset_in_page(gpa);
1696 return __kvm_read_guest_atomic(slot, gfn, data, offset, len);
1698 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic);
1700 static int __kvm_write_guest_page(struct kvm_memory_slot *memslot, gfn_t gfn,
1701 const void *data, int offset, int len)
1706 addr = gfn_to_hva_memslot(memslot, gfn);
1707 if (kvm_is_error_hva(addr))
1709 r = __copy_to_user((void __user *)addr + offset, data, len);
1712 mark_page_dirty_in_slot(memslot, gfn);
1716 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn,
1717 const void *data, int offset, int len)
1719 struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1721 return __kvm_write_guest_page(slot, gfn, data, offset, len);
1723 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1725 int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn,
1726 const void *data, int offset, int len)
1728 struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1730 return __kvm_write_guest_page(slot, gfn, data, offset, len);
1732 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page);
1734 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1737 gfn_t gfn = gpa >> PAGE_SHIFT;
1739 int offset = offset_in_page(gpa);
1742 while ((seg = next_segment(len, offset)) != 0) {
1743 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1753 EXPORT_SYMBOL_GPL(kvm_write_guest);
1755 int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data,
1758 gfn_t gfn = gpa >> PAGE_SHIFT;
1760 int offset = offset_in_page(gpa);
1763 while ((seg = next_segment(len, offset)) != 0) {
1764 ret = kvm_vcpu_write_guest_page(vcpu, gfn, data, offset, seg);
1774 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest);
1776 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1777 gpa_t gpa, unsigned long len)
1779 struct kvm_memslots *slots = kvm_memslots(kvm);
1780 int offset = offset_in_page(gpa);
1781 gfn_t start_gfn = gpa >> PAGE_SHIFT;
1782 gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT;
1783 gfn_t nr_pages_needed = end_gfn - start_gfn + 1;
1784 gfn_t nr_pages_avail;
1787 ghc->generation = slots->generation;
1789 ghc->memslot = gfn_to_memslot(kvm, start_gfn);
1790 ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, NULL);
1791 if (!kvm_is_error_hva(ghc->hva) && nr_pages_needed <= 1) {
1795 * If the requested region crosses two memslots, we still
1796 * verify that the entire region is valid here.
1798 while (start_gfn <= end_gfn) {
1799 ghc->memslot = gfn_to_memslot(kvm, start_gfn);
1800 ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn,
1802 if (kvm_is_error_hva(ghc->hva))
1804 start_gfn += nr_pages_avail;
1806 /* Use the slow path for cross page reads and writes. */
1807 ghc->memslot = NULL;
1811 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
1813 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1814 void *data, unsigned long len)
1816 struct kvm_memslots *slots = kvm_memslots(kvm);
1819 BUG_ON(len > ghc->len);
1821 if (slots->generation != ghc->generation)
1822 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len);
1824 if (unlikely(!ghc->memslot))
1825 return kvm_write_guest(kvm, ghc->gpa, data, len);
1827 if (kvm_is_error_hva(ghc->hva))
1830 r = __copy_to_user((void __user *)ghc->hva, data, len);
1833 mark_page_dirty_in_slot(ghc->memslot, ghc->gpa >> PAGE_SHIFT);
1837 EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
1839 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1840 void *data, unsigned long len)
1842 struct kvm_memslots *slots = kvm_memslots(kvm);
1845 BUG_ON(len > ghc->len);
1847 if (slots->generation != ghc->generation)
1848 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len);
1850 if (unlikely(!ghc->memslot))
1851 return kvm_read_guest(kvm, ghc->gpa, data, len);
1853 if (kvm_is_error_hva(ghc->hva))
1856 r = __copy_from_user(data, (void __user *)ghc->hva, len);
1862 EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
1864 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1866 const void *zero_page = (const void *) __va(page_to_phys(ZERO_PAGE(0)));
1868 return kvm_write_guest_page(kvm, gfn, zero_page, offset, len);
1870 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1872 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1874 gfn_t gfn = gpa >> PAGE_SHIFT;
1876 int offset = offset_in_page(gpa);
1879 while ((seg = next_segment(len, offset)) != 0) {
1880 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1889 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1891 static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot,
1894 if (memslot && memslot->dirty_bitmap) {
1895 unsigned long rel_gfn = gfn - memslot->base_gfn;
1897 set_bit_le(rel_gfn, memslot->dirty_bitmap);
1901 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1903 struct kvm_memory_slot *memslot;
1905 memslot = gfn_to_memslot(kvm, gfn);
1906 mark_page_dirty_in_slot(memslot, gfn);
1908 EXPORT_SYMBOL_GPL(mark_page_dirty);
1910 void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn)
1912 struct kvm_memory_slot *memslot;
1914 memslot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1915 mark_page_dirty_in_slot(memslot, gfn);
1917 EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty);
1919 static void grow_halt_poll_ns(struct kvm_vcpu *vcpu)
1921 int val = vcpu->halt_poll_ns;
1924 if (val == 0 && halt_poll_ns_grow)
1927 val *= halt_poll_ns_grow;
1929 vcpu->halt_poll_ns = val;
1932 static void shrink_halt_poll_ns(struct kvm_vcpu *vcpu)
1934 int val = vcpu->halt_poll_ns;
1936 if (halt_poll_ns_shrink == 0)
1939 val /= halt_poll_ns_shrink;
1941 vcpu->halt_poll_ns = val;
1944 static int kvm_vcpu_check_block(struct kvm_vcpu *vcpu)
1946 if (kvm_arch_vcpu_runnable(vcpu)) {
1947 kvm_make_request(KVM_REQ_UNHALT, vcpu);
1950 if (kvm_cpu_has_pending_timer(vcpu))
1952 if (signal_pending(current))
1959 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1961 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1965 bool waited = false;
1968 start = cur = ktime_get();
1969 if (vcpu->halt_poll_ns) {
1970 ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
1974 * This sets KVM_REQ_UNHALT if an interrupt
1977 if (kvm_vcpu_check_block(vcpu) < 0) {
1978 ++vcpu->stat.halt_successful_poll;
1982 } while (single_task_running() && ktime_before(cur, stop));
1986 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1988 if (kvm_vcpu_check_block(vcpu) < 0)
1995 finish_wait(&vcpu->wq, &wait);
1999 block_ns = ktime_to_ns(cur) - ktime_to_ns(start);
2002 if (block_ns <= vcpu->halt_poll_ns)
2004 /* we had a long block, shrink polling */
2005 else if (vcpu->halt_poll_ns && block_ns > halt_poll_ns)
2006 shrink_halt_poll_ns(vcpu);
2007 /* we had a short halt and our poll time is too small */
2008 else if (vcpu->halt_poll_ns < halt_poll_ns &&
2009 block_ns < halt_poll_ns)
2010 grow_halt_poll_ns(vcpu);
2013 trace_kvm_vcpu_wakeup(block_ns, waited);
2015 EXPORT_SYMBOL_GPL(kvm_vcpu_block);
2019 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
2021 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
2024 int cpu = vcpu->cpu;
2025 wait_queue_head_t *wqp;
2027 wqp = kvm_arch_vcpu_wq(vcpu);
2028 if (waitqueue_active(wqp)) {
2029 wake_up_interruptible(wqp);
2030 ++vcpu->stat.halt_wakeup;
2034 if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
2035 if (kvm_arch_vcpu_should_kick(vcpu))
2036 smp_send_reschedule(cpu);
2039 EXPORT_SYMBOL_GPL(kvm_vcpu_kick);
2040 #endif /* !CONFIG_S390 */
2042 int kvm_vcpu_yield_to(struct kvm_vcpu *target)
2045 struct task_struct *task = NULL;
2049 pid = rcu_dereference(target->pid);
2051 task = get_pid_task(pid, PIDTYPE_PID);
2055 ret = yield_to(task, 1);
2056 put_task_struct(task);
2060 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to);
2063 * Helper that checks whether a VCPU is eligible for directed yield.
2064 * Most eligible candidate to yield is decided by following heuristics:
2066 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
2067 * (preempted lock holder), indicated by @in_spin_loop.
2068 * Set at the beiginning and cleared at the end of interception/PLE handler.
2070 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
2071 * chance last time (mostly it has become eligible now since we have probably
2072 * yielded to lockholder in last iteration. This is done by toggling
2073 * @dy_eligible each time a VCPU checked for eligibility.)
2075 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
2076 * to preempted lock-holder could result in wrong VCPU selection and CPU
2077 * burning. Giving priority for a potential lock-holder increases lock
2080 * Since algorithm is based on heuristics, accessing another VCPU data without
2081 * locking does not harm. It may result in trying to yield to same VCPU, fail
2082 * and continue with next VCPU and so on.
2084 static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu)
2086 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
2089 eligible = !vcpu->spin_loop.in_spin_loop ||
2090 vcpu->spin_loop.dy_eligible;
2092 if (vcpu->spin_loop.in_spin_loop)
2093 kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible);
2101 void kvm_vcpu_on_spin(struct kvm_vcpu *me)
2103 struct kvm *kvm = me->kvm;
2104 struct kvm_vcpu *vcpu;
2105 int last_boosted_vcpu = me->kvm->last_boosted_vcpu;
2111 kvm_vcpu_set_in_spin_loop(me, true);
2113 * We boost the priority of a VCPU that is runnable but not
2114 * currently running, because it got preempted by something
2115 * else and called schedule in __vcpu_run. Hopefully that
2116 * VCPU is holding the lock that we need and will release it.
2117 * We approximate round-robin by starting at the last boosted VCPU.
2119 for (pass = 0; pass < 2 && !yielded && try; pass++) {
2120 kvm_for_each_vcpu(i, vcpu, kvm) {
2121 if (!pass && i <= last_boosted_vcpu) {
2122 i = last_boosted_vcpu;
2124 } else if (pass && i > last_boosted_vcpu)
2126 if (!ACCESS_ONCE(vcpu->preempted))
2130 if (waitqueue_active(&vcpu->wq) && !kvm_arch_vcpu_runnable(vcpu))
2132 if (!kvm_vcpu_eligible_for_directed_yield(vcpu))
2135 yielded = kvm_vcpu_yield_to(vcpu);
2137 kvm->last_boosted_vcpu = i;
2139 } else if (yielded < 0) {
2146 kvm_vcpu_set_in_spin_loop(me, false);
2148 /* Ensure vcpu is not eligible during next spinloop */
2149 kvm_vcpu_set_dy_eligible(me, false);
2151 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
2153 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2155 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
2158 if (vmf->pgoff == 0)
2159 page = virt_to_page(vcpu->run);
2161 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
2162 page = virt_to_page(vcpu->arch.pio_data);
2164 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2165 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
2166 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
2169 return kvm_arch_vcpu_fault(vcpu, vmf);
2175 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
2176 .fault = kvm_vcpu_fault,
2179 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
2181 vma->vm_ops = &kvm_vcpu_vm_ops;
2185 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
2187 struct kvm_vcpu *vcpu = filp->private_data;
2189 kvm_put_kvm(vcpu->kvm);
2193 static struct file_operations kvm_vcpu_fops = {
2194 .release = kvm_vcpu_release,
2195 .unlocked_ioctl = kvm_vcpu_ioctl,
2196 #ifdef CONFIG_KVM_COMPAT
2197 .compat_ioctl = kvm_vcpu_compat_ioctl,
2199 .mmap = kvm_vcpu_mmap,
2200 .llseek = noop_llseek,
2204 * Allocates an inode for the vcpu.
2206 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
2208 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC);
2212 * Creates some virtual cpus. Good luck creating more than one.
2214 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
2217 struct kvm_vcpu *vcpu, *v;
2219 if (id >= KVM_MAX_VCPUS)
2222 vcpu = kvm_arch_vcpu_create(kvm, id);
2224 return PTR_ERR(vcpu);
2226 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
2228 r = kvm_arch_vcpu_setup(vcpu);
2232 mutex_lock(&kvm->lock);
2233 if (!kvm_vcpu_compatible(vcpu)) {
2235 goto unlock_vcpu_destroy;
2237 if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
2239 goto unlock_vcpu_destroy;
2242 kvm_for_each_vcpu(r, v, kvm)
2243 if (v->vcpu_id == id) {
2245 goto unlock_vcpu_destroy;
2248 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
2250 /* Now it's all set up, let userspace reach it */
2252 r = create_vcpu_fd(vcpu);
2255 goto unlock_vcpu_destroy;
2258 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
2261 * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus
2262 * before kvm->online_vcpu's incremented value.
2265 atomic_inc(&kvm->online_vcpus);
2267 mutex_unlock(&kvm->lock);
2268 kvm_arch_vcpu_postcreate(vcpu);
2271 unlock_vcpu_destroy:
2272 mutex_unlock(&kvm->lock);
2274 kvm_arch_vcpu_destroy(vcpu);
2278 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
2281 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
2282 vcpu->sigset_active = 1;
2283 vcpu->sigset = *sigset;
2285 vcpu->sigset_active = 0;
2289 static long kvm_vcpu_ioctl(struct file *filp,
2290 unsigned int ioctl, unsigned long arg)
2292 struct kvm_vcpu *vcpu = filp->private_data;
2293 void __user *argp = (void __user *)arg;
2295 struct kvm_fpu *fpu = NULL;
2296 struct kvm_sregs *kvm_sregs = NULL;
2298 if (vcpu->kvm->mm != current->mm)
2301 if (unlikely(_IOC_TYPE(ioctl) != KVMIO))
2304 #if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS)
2306 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
2307 * so vcpu_load() would break it.
2309 if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_S390_IRQ || ioctl == KVM_INTERRUPT)
2310 return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
2314 r = vcpu_load(vcpu);
2322 if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) {
2323 /* The thread running this VCPU changed. */
2324 struct pid *oldpid = vcpu->pid;
2325 struct pid *newpid = get_task_pid(current, PIDTYPE_PID);
2327 rcu_assign_pointer(vcpu->pid, newpid);
2332 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
2333 trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
2335 case KVM_GET_REGS: {
2336 struct kvm_regs *kvm_regs;
2339 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
2342 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
2346 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
2353 case KVM_SET_REGS: {
2354 struct kvm_regs *kvm_regs;
2357 kvm_regs = memdup_user(argp, sizeof(*kvm_regs));
2358 if (IS_ERR(kvm_regs)) {
2359 r = PTR_ERR(kvm_regs);
2362 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
2366 case KVM_GET_SREGS: {
2367 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
2371 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
2375 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
2380 case KVM_SET_SREGS: {
2381 kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs));
2382 if (IS_ERR(kvm_sregs)) {
2383 r = PTR_ERR(kvm_sregs);
2387 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
2390 case KVM_GET_MP_STATE: {
2391 struct kvm_mp_state mp_state;
2393 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
2397 if (copy_to_user(argp, &mp_state, sizeof(mp_state)))
2402 case KVM_SET_MP_STATE: {
2403 struct kvm_mp_state mp_state;
2406 if (copy_from_user(&mp_state, argp, sizeof(mp_state)))
2408 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
2411 case KVM_TRANSLATE: {
2412 struct kvm_translation tr;
2415 if (copy_from_user(&tr, argp, sizeof(tr)))
2417 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
2421 if (copy_to_user(argp, &tr, sizeof(tr)))
2426 case KVM_SET_GUEST_DEBUG: {
2427 struct kvm_guest_debug dbg;
2430 if (copy_from_user(&dbg, argp, sizeof(dbg)))
2432 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
2435 case KVM_SET_SIGNAL_MASK: {
2436 struct kvm_signal_mask __user *sigmask_arg = argp;
2437 struct kvm_signal_mask kvm_sigmask;
2438 sigset_t sigset, *p;
2443 if (copy_from_user(&kvm_sigmask, argp,
2444 sizeof(kvm_sigmask)))
2447 if (kvm_sigmask.len != sizeof(sigset))
2450 if (copy_from_user(&sigset, sigmask_arg->sigset,
2455 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
2459 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
2463 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
2467 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
2473 fpu = memdup_user(argp, sizeof(*fpu));
2479 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
2483 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
2492 #ifdef CONFIG_KVM_COMPAT
2493 static long kvm_vcpu_compat_ioctl(struct file *filp,
2494 unsigned int ioctl, unsigned long arg)
2496 struct kvm_vcpu *vcpu = filp->private_data;
2497 void __user *argp = compat_ptr(arg);
2500 if (vcpu->kvm->mm != current->mm)
2504 case KVM_SET_SIGNAL_MASK: {
2505 struct kvm_signal_mask __user *sigmask_arg = argp;
2506 struct kvm_signal_mask kvm_sigmask;
2507 compat_sigset_t csigset;
2512 if (copy_from_user(&kvm_sigmask, argp,
2513 sizeof(kvm_sigmask)))
2516 if (kvm_sigmask.len != sizeof(csigset))
2519 if (copy_from_user(&csigset, sigmask_arg->sigset,
2522 sigset_from_compat(&sigset, &csigset);
2523 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2525 r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL);
2529 r = kvm_vcpu_ioctl(filp, ioctl, arg);
2537 static int kvm_device_ioctl_attr(struct kvm_device *dev,
2538 int (*accessor)(struct kvm_device *dev,
2539 struct kvm_device_attr *attr),
2542 struct kvm_device_attr attr;
2547 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
2550 return accessor(dev, &attr);
2553 static long kvm_device_ioctl(struct file *filp, unsigned int ioctl,
2556 struct kvm_device *dev = filp->private_data;
2559 case KVM_SET_DEVICE_ATTR:
2560 return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg);
2561 case KVM_GET_DEVICE_ATTR:
2562 return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg);
2563 case KVM_HAS_DEVICE_ATTR:
2564 return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg);
2566 if (dev->ops->ioctl)
2567 return dev->ops->ioctl(dev, ioctl, arg);
2573 static int kvm_device_release(struct inode *inode, struct file *filp)
2575 struct kvm_device *dev = filp->private_data;
2576 struct kvm *kvm = dev->kvm;
2582 static const struct file_operations kvm_device_fops = {
2583 .unlocked_ioctl = kvm_device_ioctl,
2584 #ifdef CONFIG_KVM_COMPAT
2585 .compat_ioctl = kvm_device_ioctl,
2587 .release = kvm_device_release,
2590 struct kvm_device *kvm_device_from_filp(struct file *filp)
2592 if (filp->f_op != &kvm_device_fops)
2595 return filp->private_data;
2598 static struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = {
2599 #ifdef CONFIG_KVM_MPIC
2600 [KVM_DEV_TYPE_FSL_MPIC_20] = &kvm_mpic_ops,
2601 [KVM_DEV_TYPE_FSL_MPIC_42] = &kvm_mpic_ops,
2604 #ifdef CONFIG_KVM_XICS
2605 [KVM_DEV_TYPE_XICS] = &kvm_xics_ops,
2609 int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type)
2611 if (type >= ARRAY_SIZE(kvm_device_ops_table))
2614 if (kvm_device_ops_table[type] != NULL)
2617 kvm_device_ops_table[type] = ops;
2621 void kvm_unregister_device_ops(u32 type)
2623 if (kvm_device_ops_table[type] != NULL)
2624 kvm_device_ops_table[type] = NULL;
2627 static int kvm_ioctl_create_device(struct kvm *kvm,
2628 struct kvm_create_device *cd)
2630 struct kvm_device_ops *ops = NULL;
2631 struct kvm_device *dev;
2632 bool test = cd->flags & KVM_CREATE_DEVICE_TEST;
2635 if (cd->type >= ARRAY_SIZE(kvm_device_ops_table))
2638 ops = kvm_device_ops_table[cd->type];
2645 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2652 ret = ops->create(dev, cd->type);
2658 ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR | O_CLOEXEC);
2664 list_add(&dev->vm_node, &kvm->devices);
2670 static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
2673 case KVM_CAP_USER_MEMORY:
2674 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
2675 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
2676 case KVM_CAP_INTERNAL_ERROR_DATA:
2677 #ifdef CONFIG_HAVE_KVM_MSI
2678 case KVM_CAP_SIGNAL_MSI:
2680 #ifdef CONFIG_HAVE_KVM_IRQFD
2682 case KVM_CAP_IRQFD_RESAMPLE:
2684 case KVM_CAP_CHECK_EXTENSION_VM:
2686 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2687 case KVM_CAP_IRQ_ROUTING:
2688 return KVM_MAX_IRQ_ROUTES;
2690 #if KVM_ADDRESS_SPACE_NUM > 1
2691 case KVM_CAP_MULTI_ADDRESS_SPACE:
2692 return KVM_ADDRESS_SPACE_NUM;
2697 return kvm_vm_ioctl_check_extension(kvm, arg);
2700 static long kvm_vm_ioctl(struct file *filp,
2701 unsigned int ioctl, unsigned long arg)
2703 struct kvm *kvm = filp->private_data;
2704 void __user *argp = (void __user *)arg;
2707 if (kvm->mm != current->mm)
2710 case KVM_CREATE_VCPU:
2711 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2713 case KVM_SET_USER_MEMORY_REGION: {
2714 struct kvm_userspace_memory_region kvm_userspace_mem;
2717 if (copy_from_user(&kvm_userspace_mem, argp,
2718 sizeof(kvm_userspace_mem)))
2721 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem);
2724 case KVM_GET_DIRTY_LOG: {
2725 struct kvm_dirty_log log;
2728 if (copy_from_user(&log, argp, sizeof(log)))
2730 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2733 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2734 case KVM_REGISTER_COALESCED_MMIO: {
2735 struct kvm_coalesced_mmio_zone zone;
2738 if (copy_from_user(&zone, argp, sizeof(zone)))
2740 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
2743 case KVM_UNREGISTER_COALESCED_MMIO: {
2744 struct kvm_coalesced_mmio_zone zone;
2747 if (copy_from_user(&zone, argp, sizeof(zone)))
2749 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
2754 struct kvm_irqfd data;
2757 if (copy_from_user(&data, argp, sizeof(data)))
2759 r = kvm_irqfd(kvm, &data);
2762 case KVM_IOEVENTFD: {
2763 struct kvm_ioeventfd data;
2766 if (copy_from_user(&data, argp, sizeof(data)))
2768 r = kvm_ioeventfd(kvm, &data);
2771 #ifdef CONFIG_HAVE_KVM_MSI
2772 case KVM_SIGNAL_MSI: {
2776 if (copy_from_user(&msi, argp, sizeof(msi)))
2778 r = kvm_send_userspace_msi(kvm, &msi);
2782 #ifdef __KVM_HAVE_IRQ_LINE
2783 case KVM_IRQ_LINE_STATUS:
2784 case KVM_IRQ_LINE: {
2785 struct kvm_irq_level irq_event;
2788 if (copy_from_user(&irq_event, argp, sizeof(irq_event)))
2791 r = kvm_vm_ioctl_irq_line(kvm, &irq_event,
2792 ioctl == KVM_IRQ_LINE_STATUS);
2797 if (ioctl == KVM_IRQ_LINE_STATUS) {
2798 if (copy_to_user(argp, &irq_event, sizeof(irq_event)))
2806 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2807 case KVM_SET_GSI_ROUTING: {
2808 struct kvm_irq_routing routing;
2809 struct kvm_irq_routing __user *urouting;
2810 struct kvm_irq_routing_entry *entries;
2813 if (copy_from_user(&routing, argp, sizeof(routing)))
2816 if (routing.nr >= KVM_MAX_IRQ_ROUTES)
2821 entries = vmalloc(routing.nr * sizeof(*entries));
2826 if (copy_from_user(entries, urouting->entries,
2827 routing.nr * sizeof(*entries)))
2828 goto out_free_irq_routing;
2829 r = kvm_set_irq_routing(kvm, entries, routing.nr,
2831 out_free_irq_routing:
2835 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
2836 case KVM_CREATE_DEVICE: {
2837 struct kvm_create_device cd;
2840 if (copy_from_user(&cd, argp, sizeof(cd)))
2843 r = kvm_ioctl_create_device(kvm, &cd);
2848 if (copy_to_user(argp, &cd, sizeof(cd)))
2854 case KVM_CHECK_EXTENSION:
2855 r = kvm_vm_ioctl_check_extension_generic(kvm, arg);
2858 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
2864 #ifdef CONFIG_KVM_COMPAT
2865 struct compat_kvm_dirty_log {
2869 compat_uptr_t dirty_bitmap; /* one bit per page */
2874 static long kvm_vm_compat_ioctl(struct file *filp,
2875 unsigned int ioctl, unsigned long arg)
2877 struct kvm *kvm = filp->private_data;
2880 if (kvm->mm != current->mm)
2883 case KVM_GET_DIRTY_LOG: {
2884 struct compat_kvm_dirty_log compat_log;
2885 struct kvm_dirty_log log;
2888 if (copy_from_user(&compat_log, (void __user *)arg,
2889 sizeof(compat_log)))
2891 log.slot = compat_log.slot;
2892 log.padding1 = compat_log.padding1;
2893 log.padding2 = compat_log.padding2;
2894 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
2896 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2900 r = kvm_vm_ioctl(filp, ioctl, arg);
2908 static struct file_operations kvm_vm_fops = {
2909 .release = kvm_vm_release,
2910 .unlocked_ioctl = kvm_vm_ioctl,
2911 #ifdef CONFIG_KVM_COMPAT
2912 .compat_ioctl = kvm_vm_compat_ioctl,
2914 .llseek = noop_llseek,
2917 static int kvm_dev_ioctl_create_vm(unsigned long type)
2922 kvm = kvm_create_vm(type);
2924 return PTR_ERR(kvm);
2925 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2926 r = kvm_coalesced_mmio_init(kvm);
2932 r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR | O_CLOEXEC);
2939 static long kvm_dev_ioctl(struct file *filp,
2940 unsigned int ioctl, unsigned long arg)
2945 case KVM_GET_API_VERSION:
2948 r = KVM_API_VERSION;
2951 r = kvm_dev_ioctl_create_vm(arg);
2953 case KVM_CHECK_EXTENSION:
2954 r = kvm_vm_ioctl_check_extension_generic(NULL, arg);
2956 case KVM_GET_VCPU_MMAP_SIZE:
2959 r = PAGE_SIZE; /* struct kvm_run */
2961 r += PAGE_SIZE; /* pio data page */
2963 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2964 r += PAGE_SIZE; /* coalesced mmio ring page */
2967 case KVM_TRACE_ENABLE:
2968 case KVM_TRACE_PAUSE:
2969 case KVM_TRACE_DISABLE:
2973 return kvm_arch_dev_ioctl(filp, ioctl, arg);
2979 static struct file_operations kvm_chardev_ops = {
2980 .unlocked_ioctl = kvm_dev_ioctl,
2981 .compat_ioctl = kvm_dev_ioctl,
2982 .llseek = noop_llseek,
2985 static struct miscdevice kvm_dev = {
2991 static void hardware_enable_nolock(void *junk)
2993 int cpu = raw_smp_processor_id();
2996 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
2999 cpumask_set_cpu(cpu, cpus_hardware_enabled);
3001 r = kvm_arch_hardware_enable();
3004 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
3005 atomic_inc(&hardware_enable_failed);
3006 pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu);
3010 static void hardware_enable(void)
3012 raw_spin_lock(&kvm_count_lock);
3013 if (kvm_usage_count)
3014 hardware_enable_nolock(NULL);
3015 raw_spin_unlock(&kvm_count_lock);
3018 static void hardware_disable_nolock(void *junk)
3020 int cpu = raw_smp_processor_id();
3022 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
3024 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
3025 kvm_arch_hardware_disable();
3028 static void hardware_disable(void)
3030 raw_spin_lock(&kvm_count_lock);
3031 if (kvm_usage_count)
3032 hardware_disable_nolock(NULL);
3033 raw_spin_unlock(&kvm_count_lock);
3036 static void hardware_disable_all_nolock(void)
3038 BUG_ON(!kvm_usage_count);
3041 if (!kvm_usage_count)
3042 on_each_cpu(hardware_disable_nolock, NULL, 1);
3045 static void hardware_disable_all(void)
3047 raw_spin_lock(&kvm_count_lock);
3048 hardware_disable_all_nolock();
3049 raw_spin_unlock(&kvm_count_lock);
3052 static int hardware_enable_all(void)
3056 raw_spin_lock(&kvm_count_lock);
3059 if (kvm_usage_count == 1) {
3060 atomic_set(&hardware_enable_failed, 0);
3061 on_each_cpu(hardware_enable_nolock, NULL, 1);
3063 if (atomic_read(&hardware_enable_failed)) {
3064 hardware_disable_all_nolock();
3069 raw_spin_unlock(&kvm_count_lock);
3074 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
3077 val &= ~CPU_TASKS_FROZEN;
3089 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
3093 * Some (well, at least mine) BIOSes hang on reboot if
3096 * And Intel TXT required VMX off for all cpu when system shutdown.
3098 pr_info("kvm: exiting hardware virtualization\n");
3099 kvm_rebooting = true;
3100 on_each_cpu(hardware_disable_nolock, NULL, 1);
3104 static struct notifier_block kvm_reboot_notifier = {
3105 .notifier_call = kvm_reboot,
3109 static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
3113 for (i = 0; i < bus->dev_count; i++) {
3114 struct kvm_io_device *pos = bus->range[i].dev;
3116 kvm_iodevice_destructor(pos);
3121 static inline int kvm_io_bus_cmp(const struct kvm_io_range *r1,
3122 const struct kvm_io_range *r2)
3124 if (r1->addr < r2->addr)
3126 if (r1->addr + r1->len > r2->addr + r2->len)
3131 static int kvm_io_bus_sort_cmp(const void *p1, const void *p2)
3133 return kvm_io_bus_cmp(p1, p2);
3136 static int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev,
3137 gpa_t addr, int len)
3139 bus->range[bus->dev_count++] = (struct kvm_io_range) {
3145 sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range),
3146 kvm_io_bus_sort_cmp, NULL);
3151 static int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus,
3152 gpa_t addr, int len)
3154 struct kvm_io_range *range, key;
3157 key = (struct kvm_io_range) {
3162 range = bsearch(&key, bus->range, bus->dev_count,
3163 sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp);
3167 off = range - bus->range;
3169 while (off > 0 && kvm_io_bus_cmp(&key, &bus->range[off-1]) == 0)
3175 static int __kvm_io_bus_write(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus,
3176 struct kvm_io_range *range, const void *val)
3180 idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
3184 while (idx < bus->dev_count &&
3185 kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
3186 if (!kvm_iodevice_write(vcpu, bus->range[idx].dev, range->addr,
3195 /* kvm_io_bus_write - called under kvm->slots_lock */
3196 int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
3197 int len, const void *val)
3199 struct kvm_io_bus *bus;
3200 struct kvm_io_range range;
3203 range = (struct kvm_io_range) {
3208 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3209 r = __kvm_io_bus_write(vcpu, bus, &range, val);
3210 return r < 0 ? r : 0;
3213 /* kvm_io_bus_write_cookie - called under kvm->slots_lock */
3214 int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx,
3215 gpa_t addr, int len, const void *val, long cookie)
3217 struct kvm_io_bus *bus;
3218 struct kvm_io_range range;
3220 range = (struct kvm_io_range) {
3225 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3227 /* First try the device referenced by cookie. */
3228 if ((cookie >= 0) && (cookie < bus->dev_count) &&
3229 (kvm_io_bus_cmp(&range, &bus->range[cookie]) == 0))
3230 if (!kvm_iodevice_write(vcpu, bus->range[cookie].dev, addr, len,
3235 * cookie contained garbage; fall back to search and return the
3236 * correct cookie value.
3238 return __kvm_io_bus_write(vcpu, bus, &range, val);
3241 static int __kvm_io_bus_read(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus,
3242 struct kvm_io_range *range, void *val)
3246 idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
3250 while (idx < bus->dev_count &&
3251 kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
3252 if (!kvm_iodevice_read(vcpu, bus->range[idx].dev, range->addr,
3260 EXPORT_SYMBOL_GPL(kvm_io_bus_write);
3262 /* kvm_io_bus_read - called under kvm->slots_lock */
3263 int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
3266 struct kvm_io_bus *bus;
3267 struct kvm_io_range range;
3270 range = (struct kvm_io_range) {
3275 bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3276 r = __kvm_io_bus_read(vcpu, bus, &range, val);
3277 return r < 0 ? r : 0;
3281 /* Caller must hold slots_lock. */
3282 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
3283 int len, struct kvm_io_device *dev)
3285 struct kvm_io_bus *new_bus, *bus;
3287 bus = kvm->buses[bus_idx];
3288 /* exclude ioeventfd which is limited by maximum fd */
3289 if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1)
3292 new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count + 1) *
3293 sizeof(struct kvm_io_range)), GFP_KERNEL);
3296 memcpy(new_bus, bus, sizeof(*bus) + (bus->dev_count *
3297 sizeof(struct kvm_io_range)));
3298 kvm_io_bus_insert_dev(new_bus, dev, addr, len);
3299 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
3300 synchronize_srcu_expedited(&kvm->srcu);
3306 /* Caller must hold slots_lock. */
3307 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
3308 struct kvm_io_device *dev)
3311 struct kvm_io_bus *new_bus, *bus;
3313 bus = kvm->buses[bus_idx];
3315 for (i = 0; i < bus->dev_count; i++)
3316 if (bus->range[i].dev == dev) {
3324 new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count - 1) *
3325 sizeof(struct kvm_io_range)), GFP_KERNEL);
3329 memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range));
3330 new_bus->dev_count--;
3331 memcpy(new_bus->range + i, bus->range + i + 1,
3332 (new_bus->dev_count - i) * sizeof(struct kvm_io_range));
3334 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
3335 synchronize_srcu_expedited(&kvm->srcu);
3340 static struct notifier_block kvm_cpu_notifier = {
3341 .notifier_call = kvm_cpu_hotplug,
3344 static int vm_stat_get(void *_offset, u64 *val)
3346 unsigned offset = (long)_offset;
3350 spin_lock(&kvm_lock);
3351 list_for_each_entry(kvm, &vm_list, vm_list)
3352 *val += *(u32 *)((void *)kvm + offset);
3353 spin_unlock(&kvm_lock);
3357 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
3359 static int vcpu_stat_get(void *_offset, u64 *val)
3361 unsigned offset = (long)_offset;
3363 struct kvm_vcpu *vcpu;
3367 spin_lock(&kvm_lock);
3368 list_for_each_entry(kvm, &vm_list, vm_list)
3369 kvm_for_each_vcpu(i, vcpu, kvm)
3370 *val += *(u32 *)((void *)vcpu + offset);
3372 spin_unlock(&kvm_lock);
3376 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
3378 static const struct file_operations *stat_fops[] = {
3379 [KVM_STAT_VCPU] = &vcpu_stat_fops,
3380 [KVM_STAT_VM] = &vm_stat_fops,
3383 static int kvm_init_debug(void)
3386 struct kvm_stats_debugfs_item *p;
3388 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
3389 if (kvm_debugfs_dir == NULL)
3392 for (p = debugfs_entries; p->name; ++p) {
3393 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
3394 (void *)(long)p->offset,
3395 stat_fops[p->kind]);
3396 if (p->dentry == NULL)
3403 debugfs_remove_recursive(kvm_debugfs_dir);
3408 static void kvm_exit_debug(void)
3410 struct kvm_stats_debugfs_item *p;
3412 for (p = debugfs_entries; p->name; ++p)
3413 debugfs_remove(p->dentry);
3414 debugfs_remove(kvm_debugfs_dir);
3417 static int kvm_suspend(void)
3419 if (kvm_usage_count)
3420 hardware_disable_nolock(NULL);
3424 static void kvm_resume(void)
3426 if (kvm_usage_count) {
3427 WARN_ON(raw_spin_is_locked(&kvm_count_lock));
3428 hardware_enable_nolock(NULL);
3432 static struct syscore_ops kvm_syscore_ops = {
3433 .suspend = kvm_suspend,
3434 .resume = kvm_resume,
3438 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
3440 return container_of(pn, struct kvm_vcpu, preempt_notifier);
3443 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
3445 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3447 if (vcpu->preempted)
3448 vcpu->preempted = false;
3450 kvm_arch_sched_in(vcpu, cpu);
3452 kvm_arch_vcpu_load(vcpu, cpu);
3455 static void kvm_sched_out(struct preempt_notifier *pn,
3456 struct task_struct *next)
3458 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3460 if (current->state == TASK_RUNNING)
3461 vcpu->preempted = true;
3462 kvm_arch_vcpu_put(vcpu);
3465 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
3466 struct module *module)
3471 r = kvm_arch_init(opaque);
3476 * kvm_arch_init makes sure there's at most one caller
3477 * for architectures that support multiple implementations,
3478 * like intel and amd on x86.
3479 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
3480 * conflicts in case kvm is already setup for another implementation.
3482 r = kvm_irqfd_init();
3486 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
3491 r = kvm_arch_hardware_setup();
3495 for_each_online_cpu(cpu) {
3496 smp_call_function_single(cpu,
3497 kvm_arch_check_processor_compat,
3503 r = register_cpu_notifier(&kvm_cpu_notifier);
3506 register_reboot_notifier(&kvm_reboot_notifier);
3508 /* A kmem cache lets us meet the alignment requirements of fx_save. */
3510 vcpu_align = __alignof__(struct kvm_vcpu);
3511 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
3513 if (!kvm_vcpu_cache) {
3518 r = kvm_async_pf_init();
3522 kvm_chardev_ops.owner = module;
3523 kvm_vm_fops.owner = module;
3524 kvm_vcpu_fops.owner = module;
3526 r = misc_register(&kvm_dev);
3528 pr_err("kvm: misc device register failed\n");
3532 register_syscore_ops(&kvm_syscore_ops);
3534 kvm_preempt_ops.sched_in = kvm_sched_in;
3535 kvm_preempt_ops.sched_out = kvm_sched_out;
3537 r = kvm_init_debug();
3539 pr_err("kvm: create debugfs files failed\n");
3543 r = kvm_vfio_ops_init();
3549 unregister_syscore_ops(&kvm_syscore_ops);
3550 misc_deregister(&kvm_dev);
3552 kvm_async_pf_deinit();
3554 kmem_cache_destroy(kvm_vcpu_cache);
3556 unregister_reboot_notifier(&kvm_reboot_notifier);
3557 unregister_cpu_notifier(&kvm_cpu_notifier);
3560 kvm_arch_hardware_unsetup();
3562 free_cpumask_var(cpus_hardware_enabled);
3570 EXPORT_SYMBOL_GPL(kvm_init);
3575 misc_deregister(&kvm_dev);
3576 kmem_cache_destroy(kvm_vcpu_cache);
3577 kvm_async_pf_deinit();
3578 unregister_syscore_ops(&kvm_syscore_ops);
3579 unregister_reboot_notifier(&kvm_reboot_notifier);
3580 unregister_cpu_notifier(&kvm_cpu_notifier);
3581 on_each_cpu(hardware_disable_nolock, NULL, 1);
3582 kvm_arch_hardware_unsetup();
3585 free_cpumask_var(cpus_hardware_enabled);
3586 kvm_vfio_ops_exit();
3588 EXPORT_SYMBOL_GPL(kvm_exit);