2 * Kernel-based Virtual Machine driver for Linux
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
7 * Copyright (C) 2006 Qumranet, Inc.
8 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
11 * Avi Kivity <avi@qumranet.com>
12 * Yaniv Kamay <yaniv@qumranet.com>
14 * This work is licensed under the terms of the GNU GPL, version 2. See
15 * the COPYING file in the top-level directory.
21 #include <linux/kvm_host.h>
22 #include <linux/kvm.h>
23 #include <linux/module.h>
24 #include <linux/errno.h>
25 #include <linux/percpu.h>
27 #include <linux/miscdevice.h>
28 #include <linux/vmalloc.h>
29 #include <linux/reboot.h>
30 #include <linux/debugfs.h>
31 #include <linux/highmem.h>
32 #include <linux/file.h>
33 #include <linux/syscore_ops.h>
34 #include <linux/cpu.h>
35 #include <linux/sched.h>
36 #include <linux/cpumask.h>
37 #include <linux/smp.h>
38 #include <linux/anon_inodes.h>
39 #include <linux/profile.h>
40 #include <linux/kvm_para.h>
41 #include <linux/pagemap.h>
42 #include <linux/mman.h>
43 #include <linux/swap.h>
44 #include <linux/bitops.h>
45 #include <linux/spinlock.h>
46 #include <linux/compat.h>
47 #include <linux/srcu.h>
48 #include <linux/hugetlb.h>
49 #include <linux/slab.h>
50 #include <linux/sort.h>
51 #include <linux/bsearch.h>
53 #include <asm/processor.h>
55 #include <asm/uaccess.h>
56 #include <asm/pgtable.h>
58 #include "coalesced_mmio.h"
61 #define CREATE_TRACE_POINTS
62 #include <trace/events/kvm.h>
64 MODULE_AUTHOR("Qumranet");
65 MODULE_LICENSE("GPL");
70 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
73 DEFINE_RAW_SPINLOCK(kvm_lock
);
76 static cpumask_var_t cpus_hardware_enabled
;
77 static int kvm_usage_count
= 0;
78 static atomic_t hardware_enable_failed
;
80 struct kmem_cache
*kvm_vcpu_cache
;
81 EXPORT_SYMBOL_GPL(kvm_vcpu_cache
);
83 static __read_mostly
struct preempt_ops kvm_preempt_ops
;
85 struct dentry
*kvm_debugfs_dir
;
87 static long kvm_vcpu_ioctl(struct file
*file
, unsigned int ioctl
,
90 static long kvm_vcpu_compat_ioctl(struct file
*file
, unsigned int ioctl
,
93 static int hardware_enable_all(void);
94 static void hardware_disable_all(void);
96 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
);
99 EXPORT_SYMBOL_GPL(kvm_rebooting
);
101 static bool largepages_enabled
= true;
103 bool kvm_is_mmio_pfn(pfn_t pfn
)
105 if (pfn_valid(pfn
)) {
107 struct page
*tail
= pfn_to_page(pfn
);
108 struct page
*head
= compound_head(tail
);
109 reserved
= PageReserved(head
);
112 * "head" is not a dangling pointer
113 * (compound_head takes care of that)
114 * but the hugepage may have been splitted
115 * from under us (and we may not hold a
116 * reference count on the head page so it can
117 * be reused before we run PageReferenced), so
118 * we've to check PageTail before returning
125 return PageReserved(tail
);
132 * Switches to specified vcpu, until a matching vcpu_put()
134 int vcpu_load(struct kvm_vcpu
*vcpu
)
138 if (mutex_lock_killable(&vcpu
->mutex
))
140 if (unlikely(vcpu
->pid
!= current
->pids
[PIDTYPE_PID
].pid
)) {
141 /* The thread running this VCPU changed. */
142 struct pid
*oldpid
= vcpu
->pid
;
143 struct pid
*newpid
= get_task_pid(current
, PIDTYPE_PID
);
144 rcu_assign_pointer(vcpu
->pid
, newpid
);
149 preempt_notifier_register(&vcpu
->preempt_notifier
);
150 kvm_arch_vcpu_load(vcpu
, cpu
);
155 void vcpu_put(struct kvm_vcpu
*vcpu
)
158 kvm_arch_vcpu_put(vcpu
);
159 preempt_notifier_unregister(&vcpu
->preempt_notifier
);
161 mutex_unlock(&vcpu
->mutex
);
164 static void ack_flush(void *_completed
)
168 static bool make_all_cpus_request(struct kvm
*kvm
, unsigned int req
)
173 struct kvm_vcpu
*vcpu
;
175 zalloc_cpumask_var(&cpus
, GFP_ATOMIC
);
178 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
179 kvm_make_request(req
, vcpu
);
182 /* Set ->requests bit before we read ->mode */
185 if (cpus
!= NULL
&& cpu
!= -1 && cpu
!= me
&&
186 kvm_vcpu_exiting_guest_mode(vcpu
) != OUTSIDE_GUEST_MODE
)
187 cpumask_set_cpu(cpu
, cpus
);
189 if (unlikely(cpus
== NULL
))
190 smp_call_function_many(cpu_online_mask
, ack_flush
, NULL
, 1);
191 else if (!cpumask_empty(cpus
))
192 smp_call_function_many(cpus
, ack_flush
, NULL
, 1);
196 free_cpumask_var(cpus
);
200 void kvm_flush_remote_tlbs(struct kvm
*kvm
)
202 long dirty_count
= kvm
->tlbs_dirty
;
205 if (make_all_cpus_request(kvm
, KVM_REQ_TLB_FLUSH
))
206 ++kvm
->stat
.remote_tlb_flush
;
207 cmpxchg(&kvm
->tlbs_dirty
, dirty_count
, 0);
210 void kvm_reload_remote_mmus(struct kvm
*kvm
)
212 make_all_cpus_request(kvm
, KVM_REQ_MMU_RELOAD
);
215 void kvm_make_mclock_inprogress_request(struct kvm
*kvm
)
217 make_all_cpus_request(kvm
, KVM_REQ_MCLOCK_INPROGRESS
);
220 void kvm_make_scan_ioapic_request(struct kvm
*kvm
)
222 make_all_cpus_request(kvm
, KVM_REQ_SCAN_IOAPIC
);
225 int kvm_vcpu_init(struct kvm_vcpu
*vcpu
, struct kvm
*kvm
, unsigned id
)
230 mutex_init(&vcpu
->mutex
);
235 init_waitqueue_head(&vcpu
->wq
);
236 kvm_async_pf_vcpu_init(vcpu
);
238 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
243 vcpu
->run
= page_address(page
);
245 kvm_vcpu_set_in_spin_loop(vcpu
, false);
246 kvm_vcpu_set_dy_eligible(vcpu
, false);
247 vcpu
->preempted
= false;
249 r
= kvm_arch_vcpu_init(vcpu
);
255 free_page((unsigned long)vcpu
->run
);
259 EXPORT_SYMBOL_GPL(kvm_vcpu_init
);
261 void kvm_vcpu_uninit(struct kvm_vcpu
*vcpu
)
264 kvm_arch_vcpu_uninit(vcpu
);
265 free_page((unsigned long)vcpu
->run
);
267 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit
);
269 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
270 static inline struct kvm
*mmu_notifier_to_kvm(struct mmu_notifier
*mn
)
272 return container_of(mn
, struct kvm
, mmu_notifier
);
275 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier
*mn
,
276 struct mm_struct
*mm
,
277 unsigned long address
)
279 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
280 int need_tlb_flush
, idx
;
283 * When ->invalidate_page runs, the linux pte has been zapped
284 * already but the page is still allocated until
285 * ->invalidate_page returns. So if we increase the sequence
286 * here the kvm page fault will notice if the spte can't be
287 * established because the page is going to be freed. If
288 * instead the kvm page fault establishes the spte before
289 * ->invalidate_page runs, kvm_unmap_hva will release it
292 * The sequence increase only need to be seen at spin_unlock
293 * time, and not at spin_lock time.
295 * Increasing the sequence after the spin_unlock would be
296 * unsafe because the kvm page fault could then establish the
297 * pte after kvm_unmap_hva returned, without noticing the page
298 * is going to be freed.
300 idx
= srcu_read_lock(&kvm
->srcu
);
301 spin_lock(&kvm
->mmu_lock
);
303 kvm
->mmu_notifier_seq
++;
304 need_tlb_flush
= kvm_unmap_hva(kvm
, address
) | kvm
->tlbs_dirty
;
305 /* we've to flush the tlb before the pages can be freed */
307 kvm_flush_remote_tlbs(kvm
);
309 spin_unlock(&kvm
->mmu_lock
);
310 srcu_read_unlock(&kvm
->srcu
, idx
);
313 static void kvm_mmu_notifier_change_pte(struct mmu_notifier
*mn
,
314 struct mm_struct
*mm
,
315 unsigned long address
,
318 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
321 idx
= srcu_read_lock(&kvm
->srcu
);
322 spin_lock(&kvm
->mmu_lock
);
323 kvm
->mmu_notifier_seq
++;
324 kvm_set_spte_hva(kvm
, address
, pte
);
325 spin_unlock(&kvm
->mmu_lock
);
326 srcu_read_unlock(&kvm
->srcu
, idx
);
329 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier
*mn
,
330 struct mm_struct
*mm
,
334 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
335 int need_tlb_flush
= 0, idx
;
337 idx
= srcu_read_lock(&kvm
->srcu
);
338 spin_lock(&kvm
->mmu_lock
);
340 * The count increase must become visible at unlock time as no
341 * spte can be established without taking the mmu_lock and
342 * count is also read inside the mmu_lock critical section.
344 kvm
->mmu_notifier_count
++;
345 need_tlb_flush
= kvm_unmap_hva_range(kvm
, start
, end
);
346 need_tlb_flush
|= kvm
->tlbs_dirty
;
347 /* we've to flush the tlb before the pages can be freed */
349 kvm_flush_remote_tlbs(kvm
);
351 spin_unlock(&kvm
->mmu_lock
);
352 srcu_read_unlock(&kvm
->srcu
, idx
);
355 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier
*mn
,
356 struct mm_struct
*mm
,
360 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
362 spin_lock(&kvm
->mmu_lock
);
364 * This sequence increase will notify the kvm page fault that
365 * the page that is going to be mapped in the spte could have
368 kvm
->mmu_notifier_seq
++;
371 * The above sequence increase must be visible before the
372 * below count decrease, which is ensured by the smp_wmb above
373 * in conjunction with the smp_rmb in mmu_notifier_retry().
375 kvm
->mmu_notifier_count
--;
376 spin_unlock(&kvm
->mmu_lock
);
378 BUG_ON(kvm
->mmu_notifier_count
< 0);
381 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier
*mn
,
382 struct mm_struct
*mm
,
383 unsigned long address
)
385 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
388 idx
= srcu_read_lock(&kvm
->srcu
);
389 spin_lock(&kvm
->mmu_lock
);
391 young
= kvm_age_hva(kvm
, address
);
393 kvm_flush_remote_tlbs(kvm
);
395 spin_unlock(&kvm
->mmu_lock
);
396 srcu_read_unlock(&kvm
->srcu
, idx
);
401 static int kvm_mmu_notifier_test_young(struct mmu_notifier
*mn
,
402 struct mm_struct
*mm
,
403 unsigned long address
)
405 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
408 idx
= srcu_read_lock(&kvm
->srcu
);
409 spin_lock(&kvm
->mmu_lock
);
410 young
= kvm_test_age_hva(kvm
, address
);
411 spin_unlock(&kvm
->mmu_lock
);
412 srcu_read_unlock(&kvm
->srcu
, idx
);
417 static void kvm_mmu_notifier_release(struct mmu_notifier
*mn
,
418 struct mm_struct
*mm
)
420 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
423 idx
= srcu_read_lock(&kvm
->srcu
);
424 kvm_arch_flush_shadow_all(kvm
);
425 srcu_read_unlock(&kvm
->srcu
, idx
);
428 static const struct mmu_notifier_ops kvm_mmu_notifier_ops
= {
429 .invalidate_page
= kvm_mmu_notifier_invalidate_page
,
430 .invalidate_range_start
= kvm_mmu_notifier_invalidate_range_start
,
431 .invalidate_range_end
= kvm_mmu_notifier_invalidate_range_end
,
432 .clear_flush_young
= kvm_mmu_notifier_clear_flush_young
,
433 .test_young
= kvm_mmu_notifier_test_young
,
434 .change_pte
= kvm_mmu_notifier_change_pte
,
435 .release
= kvm_mmu_notifier_release
,
438 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
440 kvm
->mmu_notifier
.ops
= &kvm_mmu_notifier_ops
;
441 return mmu_notifier_register(&kvm
->mmu_notifier
, current
->mm
);
444 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
446 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
451 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
453 static void kvm_init_memslots_id(struct kvm
*kvm
)
456 struct kvm_memslots
*slots
= kvm
->memslots
;
458 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
459 slots
->id_to_index
[i
] = slots
->memslots
[i
].id
= i
;
462 static struct kvm
*kvm_create_vm(unsigned long type
)
465 struct kvm
*kvm
= kvm_arch_alloc_vm();
468 return ERR_PTR(-ENOMEM
);
470 r
= kvm_arch_init_vm(kvm
, type
);
472 goto out_err_nodisable
;
474 r
= hardware_enable_all();
476 goto out_err_nodisable
;
478 #ifdef CONFIG_HAVE_KVM_IRQCHIP
479 INIT_HLIST_HEAD(&kvm
->mask_notifier_list
);
480 INIT_HLIST_HEAD(&kvm
->irq_ack_notifier_list
);
483 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM
> SHRT_MAX
);
486 kvm
->memslots
= kzalloc(sizeof(struct kvm_memslots
), GFP_KERNEL
);
489 kvm_init_memslots_id(kvm
);
490 if (init_srcu_struct(&kvm
->srcu
))
492 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
493 kvm
->buses
[i
] = kzalloc(sizeof(struct kvm_io_bus
),
499 spin_lock_init(&kvm
->mmu_lock
);
500 kvm
->mm
= current
->mm
;
501 atomic_inc(&kvm
->mm
->mm_count
);
502 kvm_eventfd_init(kvm
);
503 mutex_init(&kvm
->lock
);
504 mutex_init(&kvm
->irq_lock
);
505 mutex_init(&kvm
->slots_lock
);
506 atomic_set(&kvm
->users_count
, 1);
507 INIT_LIST_HEAD(&kvm
->devices
);
509 r
= kvm_init_mmu_notifier(kvm
);
513 raw_spin_lock(&kvm_lock
);
514 list_add(&kvm
->vm_list
, &vm_list
);
515 raw_spin_unlock(&kvm_lock
);
520 cleanup_srcu_struct(&kvm
->srcu
);
522 hardware_disable_all();
524 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
525 kfree(kvm
->buses
[i
]);
526 kfree(kvm
->memslots
);
527 kvm_arch_free_vm(kvm
);
532 * Avoid using vmalloc for a small buffer.
533 * Should not be used when the size is statically known.
535 void *kvm_kvzalloc(unsigned long size
)
537 if (size
> PAGE_SIZE
)
538 return vzalloc(size
);
540 return kzalloc(size
, GFP_KERNEL
);
543 void kvm_kvfree(const void *addr
)
545 if (is_vmalloc_addr(addr
))
551 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot
*memslot
)
553 if (!memslot
->dirty_bitmap
)
556 kvm_kvfree(memslot
->dirty_bitmap
);
557 memslot
->dirty_bitmap
= NULL
;
561 * Free any memory in @free but not in @dont.
563 static void kvm_free_physmem_slot(struct kvm_memory_slot
*free
,
564 struct kvm_memory_slot
*dont
)
566 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
567 kvm_destroy_dirty_bitmap(free
);
569 kvm_arch_free_memslot(free
, dont
);
574 void kvm_free_physmem(struct kvm
*kvm
)
576 struct kvm_memslots
*slots
= kvm
->memslots
;
577 struct kvm_memory_slot
*memslot
;
579 kvm_for_each_memslot(memslot
, slots
)
580 kvm_free_physmem_slot(memslot
, NULL
);
582 kfree(kvm
->memslots
);
585 static void kvm_destroy_devices(struct kvm
*kvm
)
587 struct list_head
*node
, *tmp
;
589 list_for_each_safe(node
, tmp
, &kvm
->devices
) {
590 struct kvm_device
*dev
=
591 list_entry(node
, struct kvm_device
, vm_node
);
594 dev
->ops
->destroy(dev
);
598 static void kvm_destroy_vm(struct kvm
*kvm
)
601 struct mm_struct
*mm
= kvm
->mm
;
603 kvm_arch_sync_events(kvm
);
604 raw_spin_lock(&kvm_lock
);
605 list_del(&kvm
->vm_list
);
606 raw_spin_unlock(&kvm_lock
);
607 kvm_free_irq_routing(kvm
);
608 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
609 kvm_io_bus_destroy(kvm
->buses
[i
]);
610 kvm_coalesced_mmio_free(kvm
);
611 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
612 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
614 kvm_arch_flush_shadow_all(kvm
);
616 kvm_arch_destroy_vm(kvm
);
617 kvm_destroy_devices(kvm
);
618 kvm_free_physmem(kvm
);
619 cleanup_srcu_struct(&kvm
->srcu
);
620 kvm_arch_free_vm(kvm
);
621 hardware_disable_all();
625 void kvm_get_kvm(struct kvm
*kvm
)
627 atomic_inc(&kvm
->users_count
);
629 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
631 void kvm_put_kvm(struct kvm
*kvm
)
633 if (atomic_dec_and_test(&kvm
->users_count
))
636 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
639 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
641 struct kvm
*kvm
= filp
->private_data
;
643 kvm_irqfd_release(kvm
);
650 * Allocation size is twice as large as the actual dirty bitmap size.
651 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
653 static int kvm_create_dirty_bitmap(struct kvm_memory_slot
*memslot
)
656 unsigned long dirty_bytes
= 2 * kvm_dirty_bitmap_bytes(memslot
);
658 memslot
->dirty_bitmap
= kvm_kvzalloc(dirty_bytes
);
659 if (!memslot
->dirty_bitmap
)
662 #endif /* !CONFIG_S390 */
666 static int cmp_memslot(const void *slot1
, const void *slot2
)
668 struct kvm_memory_slot
*s1
, *s2
;
670 s1
= (struct kvm_memory_slot
*)slot1
;
671 s2
= (struct kvm_memory_slot
*)slot2
;
673 if (s1
->npages
< s2
->npages
)
675 if (s1
->npages
> s2
->npages
)
682 * Sort the memslots base on its size, so the larger slots
683 * will get better fit.
685 static void sort_memslots(struct kvm_memslots
*slots
)
689 sort(slots
->memslots
, KVM_MEM_SLOTS_NUM
,
690 sizeof(struct kvm_memory_slot
), cmp_memslot
, NULL
);
692 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
693 slots
->id_to_index
[slots
->memslots
[i
].id
] = i
;
696 void update_memslots(struct kvm_memslots
*slots
, struct kvm_memory_slot
*new,
701 struct kvm_memory_slot
*old
= id_to_memslot(slots
, id
);
702 unsigned long npages
= old
->npages
;
705 if (new->npages
!= npages
)
706 sort_memslots(slots
);
709 slots
->generation
= last_generation
+ 1;
712 static int check_memory_region_flags(struct kvm_userspace_memory_region
*mem
)
714 u32 valid_flags
= KVM_MEM_LOG_DIRTY_PAGES
;
716 #ifdef KVM_CAP_READONLY_MEM
717 valid_flags
|= KVM_MEM_READONLY
;
720 if (mem
->flags
& ~valid_flags
)
726 static struct kvm_memslots
*install_new_memslots(struct kvm
*kvm
,
727 struct kvm_memslots
*slots
, struct kvm_memory_slot
*new)
729 struct kvm_memslots
*old_memslots
= kvm
->memslots
;
731 update_memslots(slots
, new, kvm
->memslots
->generation
);
732 rcu_assign_pointer(kvm
->memslots
, slots
);
733 synchronize_srcu_expedited(&kvm
->srcu
);
738 * Allocate some memory and give it an address in the guest physical address
741 * Discontiguous memory is allowed, mostly for framebuffers.
743 * Must be called holding mmap_sem for write.
745 int __kvm_set_memory_region(struct kvm
*kvm
,
746 struct kvm_userspace_memory_region
*mem
)
750 unsigned long npages
;
751 struct kvm_memory_slot
*slot
;
752 struct kvm_memory_slot old
, new;
753 struct kvm_memslots
*slots
= NULL
, *old_memslots
;
754 enum kvm_mr_change change
;
756 r
= check_memory_region_flags(mem
);
761 /* General sanity checks */
762 if (mem
->memory_size
& (PAGE_SIZE
- 1))
764 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
766 /* We can read the guest memory with __xxx_user() later on. */
767 if ((mem
->slot
< KVM_USER_MEM_SLOTS
) &&
768 ((mem
->userspace_addr
& (PAGE_SIZE
- 1)) ||
769 !access_ok(VERIFY_WRITE
,
770 (void __user
*)(unsigned long)mem
->userspace_addr
,
773 if (mem
->slot
>= KVM_MEM_SLOTS_NUM
)
775 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
778 slot
= id_to_memslot(kvm
->memslots
, mem
->slot
);
779 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
780 npages
= mem
->memory_size
>> PAGE_SHIFT
;
783 if (npages
> KVM_MEM_MAX_NR_PAGES
)
787 mem
->flags
&= ~KVM_MEM_LOG_DIRTY_PAGES
;
792 new.base_gfn
= base_gfn
;
794 new.flags
= mem
->flags
;
799 change
= KVM_MR_CREATE
;
800 else { /* Modify an existing slot. */
801 if ((mem
->userspace_addr
!= old
.userspace_addr
) ||
802 (npages
!= old
.npages
) ||
803 ((new.flags
^ old
.flags
) & KVM_MEM_READONLY
))
806 if (base_gfn
!= old
.base_gfn
)
807 change
= KVM_MR_MOVE
;
808 else if (new.flags
!= old
.flags
)
809 change
= KVM_MR_FLAGS_ONLY
;
810 else { /* Nothing to change. */
815 } else if (old
.npages
) {
816 change
= KVM_MR_DELETE
;
817 } else /* Modify a non-existent slot: disallowed. */
820 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
821 /* Check for overlaps */
823 kvm_for_each_memslot(slot
, kvm
->memslots
) {
824 if ((slot
->id
>= KVM_USER_MEM_SLOTS
) ||
825 (slot
->id
== mem
->slot
))
827 if (!((base_gfn
+ npages
<= slot
->base_gfn
) ||
828 (base_gfn
>= slot
->base_gfn
+ slot
->npages
)))
833 /* Free page dirty bitmap if unneeded */
834 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
835 new.dirty_bitmap
= NULL
;
838 if (change
== KVM_MR_CREATE
) {
839 new.userspace_addr
= mem
->userspace_addr
;
841 if (kvm_arch_create_memslot(&new, npages
))
845 /* Allocate page dirty bitmap if needed */
846 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
847 if (kvm_create_dirty_bitmap(&new) < 0)
851 if ((change
== KVM_MR_DELETE
) || (change
== KVM_MR_MOVE
)) {
853 slots
= kmemdup(kvm
->memslots
, sizeof(struct kvm_memslots
),
857 slot
= id_to_memslot(slots
, mem
->slot
);
858 slot
->flags
|= KVM_MEMSLOT_INVALID
;
860 old_memslots
= install_new_memslots(kvm
, slots
, NULL
);
862 /* slot was deleted or moved, clear iommu mapping */
863 kvm_iommu_unmap_pages(kvm
, &old
);
864 /* From this point no new shadow pages pointing to a deleted,
865 * or moved, memslot will be created.
867 * validation of sp->gfn happens in:
868 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
869 * - kvm_is_visible_gfn (mmu_check_roots)
871 kvm_arch_flush_shadow_memslot(kvm
, slot
);
872 slots
= old_memslots
;
875 r
= kvm_arch_prepare_memory_region(kvm
, &new, mem
, change
);
881 * We can re-use the old_memslots from above, the only difference
882 * from the currently installed memslots is the invalid flag. This
883 * will get overwritten by update_memslots anyway.
886 slots
= kmemdup(kvm
->memslots
, sizeof(struct kvm_memslots
),
893 * IOMMU mapping: New slots need to be mapped. Old slots need to be
894 * un-mapped and re-mapped if their base changes. Since base change
895 * unmapping is handled above with slot deletion, mapping alone is
896 * needed here. Anything else the iommu might care about for existing
897 * slots (size changes, userspace addr changes and read-only flag
898 * changes) is disallowed above, so any other attribute changes getting
899 * here can be skipped.
901 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
902 r
= kvm_iommu_map_pages(kvm
, &new);
907 /* actual memory is freed via old in kvm_free_physmem_slot below */
908 if (change
== KVM_MR_DELETE
) {
909 new.dirty_bitmap
= NULL
;
910 memset(&new.arch
, 0, sizeof(new.arch
));
913 old_memslots
= install_new_memslots(kvm
, slots
, &new);
915 kvm_arch_commit_memory_region(kvm
, mem
, &old
, change
);
917 kvm_free_physmem_slot(&old
, &new);
925 kvm_free_physmem_slot(&new, &old
);
929 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
931 int kvm_set_memory_region(struct kvm
*kvm
,
932 struct kvm_userspace_memory_region
*mem
)
936 mutex_lock(&kvm
->slots_lock
);
937 r
= __kvm_set_memory_region(kvm
, mem
);
938 mutex_unlock(&kvm
->slots_lock
);
941 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
943 int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
944 struct kvm_userspace_memory_region
*mem
)
946 if (mem
->slot
>= KVM_USER_MEM_SLOTS
)
948 return kvm_set_memory_region(kvm
, mem
);
951 int kvm_get_dirty_log(struct kvm
*kvm
,
952 struct kvm_dirty_log
*log
, int *is_dirty
)
954 struct kvm_memory_slot
*memslot
;
957 unsigned long any
= 0;
960 if (log
->slot
>= KVM_USER_MEM_SLOTS
)
963 memslot
= id_to_memslot(kvm
->memslots
, log
->slot
);
965 if (!memslot
->dirty_bitmap
)
968 n
= kvm_dirty_bitmap_bytes(memslot
);
970 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
971 any
= memslot
->dirty_bitmap
[i
];
974 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
985 bool kvm_largepages_enabled(void)
987 return largepages_enabled
;
990 void kvm_disable_largepages(void)
992 largepages_enabled
= false;
994 EXPORT_SYMBOL_GPL(kvm_disable_largepages
);
996 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
998 return __gfn_to_memslot(kvm_memslots(kvm
), gfn
);
1000 EXPORT_SYMBOL_GPL(gfn_to_memslot
);
1002 int kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
1004 struct kvm_memory_slot
*memslot
= gfn_to_memslot(kvm
, gfn
);
1006 if (!memslot
|| memslot
->id
>= KVM_USER_MEM_SLOTS
||
1007 memslot
->flags
& KVM_MEMSLOT_INVALID
)
1012 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
1014 unsigned long kvm_host_page_size(struct kvm
*kvm
, gfn_t gfn
)
1016 struct vm_area_struct
*vma
;
1017 unsigned long addr
, size
;
1021 addr
= gfn_to_hva(kvm
, gfn
);
1022 if (kvm_is_error_hva(addr
))
1025 down_read(¤t
->mm
->mmap_sem
);
1026 vma
= find_vma(current
->mm
, addr
);
1030 size
= vma_kernel_pagesize(vma
);
1033 up_read(¤t
->mm
->mmap_sem
);
1038 static bool memslot_is_readonly(struct kvm_memory_slot
*slot
)
1040 return slot
->flags
& KVM_MEM_READONLY
;
1043 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1044 gfn_t
*nr_pages
, bool write
)
1046 if (!slot
|| slot
->flags
& KVM_MEMSLOT_INVALID
)
1047 return KVM_HVA_ERR_BAD
;
1049 if (memslot_is_readonly(slot
) && write
)
1050 return KVM_HVA_ERR_RO_BAD
;
1053 *nr_pages
= slot
->npages
- (gfn
- slot
->base_gfn
);
1055 return __gfn_to_hva_memslot(slot
, gfn
);
1058 static unsigned long gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1061 return __gfn_to_hva_many(slot
, gfn
, nr_pages
, true);
1064 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot
*slot
,
1067 return gfn_to_hva_many(slot
, gfn
, NULL
);
1069 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot
);
1071 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
1073 return gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, NULL
);
1075 EXPORT_SYMBOL_GPL(gfn_to_hva
);
1078 * The hva returned by this function is only allowed to be read.
1079 * It should pair with kvm_read_hva() or kvm_read_hva_atomic().
1081 static unsigned long gfn_to_hva_read(struct kvm
*kvm
, gfn_t gfn
)
1083 return __gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, NULL
, false);
1086 static int kvm_read_hva(void *data
, void __user
*hva
, int len
)
1088 return __copy_from_user(data
, hva
, len
);
1091 static int kvm_read_hva_atomic(void *data
, void __user
*hva
, int len
)
1093 return __copy_from_user_inatomic(data
, hva
, len
);
1096 static int get_user_page_nowait(struct task_struct
*tsk
, struct mm_struct
*mm
,
1097 unsigned long start
, int write
, struct page
**page
)
1099 int flags
= FOLL_TOUCH
| FOLL_NOWAIT
| FOLL_HWPOISON
| FOLL_GET
;
1102 flags
|= FOLL_WRITE
;
1104 return __get_user_pages(tsk
, mm
, start
, 1, flags
, page
, NULL
, NULL
);
1107 static inline int check_user_page_hwpoison(unsigned long addr
)
1109 int rc
, flags
= FOLL_TOUCH
| FOLL_HWPOISON
| FOLL_WRITE
;
1111 rc
= __get_user_pages(current
, current
->mm
, addr
, 1,
1112 flags
, NULL
, NULL
, NULL
);
1113 return rc
== -EHWPOISON
;
1117 * The atomic path to get the writable pfn which will be stored in @pfn,
1118 * true indicates success, otherwise false is returned.
1120 static bool hva_to_pfn_fast(unsigned long addr
, bool atomic
, bool *async
,
1121 bool write_fault
, bool *writable
, pfn_t
*pfn
)
1123 struct page
*page
[1];
1126 if (!(async
|| atomic
))
1130 * Fast pin a writable pfn only if it is a write fault request
1131 * or the caller allows to map a writable pfn for a read fault
1134 if (!(write_fault
|| writable
))
1137 npages
= __get_user_pages_fast(addr
, 1, 1, page
);
1139 *pfn
= page_to_pfn(page
[0]);
1150 * The slow path to get the pfn of the specified host virtual address,
1151 * 1 indicates success, -errno is returned if error is detected.
1153 static int hva_to_pfn_slow(unsigned long addr
, bool *async
, bool write_fault
,
1154 bool *writable
, pfn_t
*pfn
)
1156 struct page
*page
[1];
1162 *writable
= write_fault
;
1165 down_read(¤t
->mm
->mmap_sem
);
1166 npages
= get_user_page_nowait(current
, current
->mm
,
1167 addr
, write_fault
, page
);
1168 up_read(¤t
->mm
->mmap_sem
);
1170 npages
= get_user_pages_fast(addr
, 1, write_fault
,
1175 /* map read fault as writable if possible */
1176 if (unlikely(!write_fault
) && writable
) {
1177 struct page
*wpage
[1];
1179 npages
= __get_user_pages_fast(addr
, 1, 1, wpage
);
1188 *pfn
= page_to_pfn(page
[0]);
1192 static bool vma_is_valid(struct vm_area_struct
*vma
, bool write_fault
)
1194 if (unlikely(!(vma
->vm_flags
& VM_READ
)))
1197 if (write_fault
&& (unlikely(!(vma
->vm_flags
& VM_WRITE
))))
1204 * Pin guest page in memory and return its pfn.
1205 * @addr: host virtual address which maps memory to the guest
1206 * @atomic: whether this function can sleep
1207 * @async: whether this function need to wait IO complete if the
1208 * host page is not in the memory
1209 * @write_fault: whether we should get a writable host page
1210 * @writable: whether it allows to map a writable host page for !@write_fault
1212 * The function will map a writable host page for these two cases:
1213 * 1): @write_fault = true
1214 * 2): @write_fault = false && @writable, @writable will tell the caller
1215 * whether the mapping is writable.
1217 static pfn_t
hva_to_pfn(unsigned long addr
, bool atomic
, bool *async
,
1218 bool write_fault
, bool *writable
)
1220 struct vm_area_struct
*vma
;
1224 /* we can do it either atomically or asynchronously, not both */
1225 BUG_ON(atomic
&& async
);
1227 if (hva_to_pfn_fast(addr
, atomic
, async
, write_fault
, writable
, &pfn
))
1231 return KVM_PFN_ERR_FAULT
;
1233 npages
= hva_to_pfn_slow(addr
, async
, write_fault
, writable
, &pfn
);
1237 down_read(¤t
->mm
->mmap_sem
);
1238 if (npages
== -EHWPOISON
||
1239 (!async
&& check_user_page_hwpoison(addr
))) {
1240 pfn
= KVM_PFN_ERR_HWPOISON
;
1244 vma
= find_vma_intersection(current
->mm
, addr
, addr
+ 1);
1247 pfn
= KVM_PFN_ERR_FAULT
;
1248 else if ((vma
->vm_flags
& VM_PFNMAP
)) {
1249 pfn
= ((addr
- vma
->vm_start
) >> PAGE_SHIFT
) +
1251 BUG_ON(!kvm_is_mmio_pfn(pfn
));
1253 if (async
&& vma_is_valid(vma
, write_fault
))
1255 pfn
= KVM_PFN_ERR_FAULT
;
1258 up_read(¤t
->mm
->mmap_sem
);
1263 __gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
, bool atomic
,
1264 bool *async
, bool write_fault
, bool *writable
)
1266 unsigned long addr
= __gfn_to_hva_many(slot
, gfn
, NULL
, write_fault
);
1268 if (addr
== KVM_HVA_ERR_RO_BAD
)
1269 return KVM_PFN_ERR_RO_FAULT
;
1271 if (kvm_is_error_hva(addr
))
1272 return KVM_PFN_NOSLOT
;
1274 /* Do not map writable pfn in the readonly memslot. */
1275 if (writable
&& memslot_is_readonly(slot
)) {
1280 return hva_to_pfn(addr
, atomic
, async
, write_fault
,
1284 static pfn_t
__gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
, bool atomic
, bool *async
,
1285 bool write_fault
, bool *writable
)
1287 struct kvm_memory_slot
*slot
;
1292 slot
= gfn_to_memslot(kvm
, gfn
);
1294 return __gfn_to_pfn_memslot(slot
, gfn
, atomic
, async
, write_fault
,
1298 pfn_t
gfn_to_pfn_atomic(struct kvm
*kvm
, gfn_t gfn
)
1300 return __gfn_to_pfn(kvm
, gfn
, true, NULL
, true, NULL
);
1302 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic
);
1304 pfn_t
gfn_to_pfn_async(struct kvm
*kvm
, gfn_t gfn
, bool *async
,
1305 bool write_fault
, bool *writable
)
1307 return __gfn_to_pfn(kvm
, gfn
, false, async
, write_fault
, writable
);
1309 EXPORT_SYMBOL_GPL(gfn_to_pfn_async
);
1311 pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
1313 return __gfn_to_pfn(kvm
, gfn
, false, NULL
, true, NULL
);
1315 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
1317 pfn_t
gfn_to_pfn_prot(struct kvm
*kvm
, gfn_t gfn
, bool write_fault
,
1320 return __gfn_to_pfn(kvm
, gfn
, false, NULL
, write_fault
, writable
);
1322 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot
);
1324 pfn_t
gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1326 return __gfn_to_pfn_memslot(slot
, gfn
, false, NULL
, true, NULL
);
1329 pfn_t
gfn_to_pfn_memslot_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1331 return __gfn_to_pfn_memslot(slot
, gfn
, true, NULL
, true, NULL
);
1333 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic
);
1335 int gfn_to_page_many_atomic(struct kvm
*kvm
, gfn_t gfn
, struct page
**pages
,
1341 addr
= gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, &entry
);
1342 if (kvm_is_error_hva(addr
))
1345 if (entry
< nr_pages
)
1348 return __get_user_pages_fast(addr
, nr_pages
, 1, pages
);
1350 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic
);
1352 static struct page
*kvm_pfn_to_page(pfn_t pfn
)
1354 if (is_error_noslot_pfn(pfn
))
1355 return KVM_ERR_PTR_BAD_PAGE
;
1357 if (kvm_is_mmio_pfn(pfn
)) {
1359 return KVM_ERR_PTR_BAD_PAGE
;
1362 return pfn_to_page(pfn
);
1365 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
1369 pfn
= gfn_to_pfn(kvm
, gfn
);
1371 return kvm_pfn_to_page(pfn
);
1374 EXPORT_SYMBOL_GPL(gfn_to_page
);
1376 void kvm_release_page_clean(struct page
*page
)
1378 WARN_ON(is_error_page(page
));
1380 kvm_release_pfn_clean(page_to_pfn(page
));
1382 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1384 void kvm_release_pfn_clean(pfn_t pfn
)
1386 if (!is_error_noslot_pfn(pfn
) && !kvm_is_mmio_pfn(pfn
))
1387 put_page(pfn_to_page(pfn
));
1389 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1391 void kvm_release_page_dirty(struct page
*page
)
1393 WARN_ON(is_error_page(page
));
1395 kvm_release_pfn_dirty(page_to_pfn(page
));
1397 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1399 void kvm_release_pfn_dirty(pfn_t pfn
)
1401 kvm_set_pfn_dirty(pfn
);
1402 kvm_release_pfn_clean(pfn
);
1404 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty
);
1406 void kvm_set_page_dirty(struct page
*page
)
1408 kvm_set_pfn_dirty(page_to_pfn(page
));
1410 EXPORT_SYMBOL_GPL(kvm_set_page_dirty
);
1412 void kvm_set_pfn_dirty(pfn_t pfn
)
1414 if (!kvm_is_mmio_pfn(pfn
)) {
1415 struct page
*page
= pfn_to_page(pfn
);
1416 if (!PageReserved(page
))
1420 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1422 void kvm_set_pfn_accessed(pfn_t pfn
)
1424 if (!kvm_is_mmio_pfn(pfn
))
1425 mark_page_accessed(pfn_to_page(pfn
));
1427 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1429 void kvm_get_pfn(pfn_t pfn
)
1431 if (!kvm_is_mmio_pfn(pfn
))
1432 get_page(pfn_to_page(pfn
));
1434 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1436 static int next_segment(unsigned long len
, int offset
)
1438 if (len
> PAGE_SIZE
- offset
)
1439 return PAGE_SIZE
- offset
;
1444 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1450 addr
= gfn_to_hva_read(kvm
, gfn
);
1451 if (kvm_is_error_hva(addr
))
1453 r
= kvm_read_hva(data
, (void __user
*)addr
+ offset
, len
);
1458 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1460 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1462 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1464 int offset
= offset_in_page(gpa
);
1467 while ((seg
= next_segment(len
, offset
)) != 0) {
1468 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
1478 EXPORT_SYMBOL_GPL(kvm_read_guest
);
1480 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
1485 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1486 int offset
= offset_in_page(gpa
);
1488 addr
= gfn_to_hva_read(kvm
, gfn
);
1489 if (kvm_is_error_hva(addr
))
1491 pagefault_disable();
1492 r
= kvm_read_hva_atomic(data
, (void __user
*)addr
+ offset
, len
);
1498 EXPORT_SYMBOL(kvm_read_guest_atomic
);
1500 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
, const void *data
,
1501 int offset
, int len
)
1506 addr
= gfn_to_hva(kvm
, gfn
);
1507 if (kvm_is_error_hva(addr
))
1509 r
= __copy_to_user((void __user
*)addr
+ offset
, data
, len
);
1512 mark_page_dirty(kvm
, gfn
);
1515 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
1517 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
1520 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1522 int offset
= offset_in_page(gpa
);
1525 while ((seg
= next_segment(len
, offset
)) != 0) {
1526 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
1537 int kvm_gfn_to_hva_cache_init(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1538 gpa_t gpa
, unsigned long len
)
1540 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1541 int offset
= offset_in_page(gpa
);
1542 gfn_t start_gfn
= gpa
>> PAGE_SHIFT
;
1543 gfn_t end_gfn
= (gpa
+ len
- 1) >> PAGE_SHIFT
;
1544 gfn_t nr_pages_needed
= end_gfn
- start_gfn
+ 1;
1545 gfn_t nr_pages_avail
;
1548 ghc
->generation
= slots
->generation
;
1550 ghc
->memslot
= gfn_to_memslot(kvm
, start_gfn
);
1551 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
, &nr_pages_avail
);
1552 if (!kvm_is_error_hva(ghc
->hva
) && nr_pages_avail
>= nr_pages_needed
) {
1556 * If the requested region crosses two memslots, we still
1557 * verify that the entire region is valid here.
1559 while (start_gfn
<= end_gfn
) {
1560 ghc
->memslot
= gfn_to_memslot(kvm
, start_gfn
);
1561 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
,
1563 if (kvm_is_error_hva(ghc
->hva
))
1565 start_gfn
+= nr_pages_avail
;
1567 /* Use the slow path for cross page reads and writes. */
1568 ghc
->memslot
= NULL
;
1572 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init
);
1574 int kvm_write_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1575 void *data
, unsigned long len
)
1577 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1580 BUG_ON(len
> ghc
->len
);
1582 if (slots
->generation
!= ghc
->generation
)
1583 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
, ghc
->len
);
1585 if (unlikely(!ghc
->memslot
))
1586 return kvm_write_guest(kvm
, ghc
->gpa
, data
, len
);
1588 if (kvm_is_error_hva(ghc
->hva
))
1591 r
= __copy_to_user((void __user
*)ghc
->hva
, data
, len
);
1594 mark_page_dirty_in_slot(kvm
, ghc
->memslot
, ghc
->gpa
>> PAGE_SHIFT
);
1598 EXPORT_SYMBOL_GPL(kvm_write_guest_cached
);
1600 int kvm_read_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1601 void *data
, unsigned long len
)
1603 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1606 BUG_ON(len
> ghc
->len
);
1608 if (slots
->generation
!= ghc
->generation
)
1609 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
, ghc
->len
);
1611 if (unlikely(!ghc
->memslot
))
1612 return kvm_read_guest(kvm
, ghc
->gpa
, data
, len
);
1614 if (kvm_is_error_hva(ghc
->hva
))
1617 r
= __copy_from_user(data
, (void __user
*)ghc
->hva
, len
);
1623 EXPORT_SYMBOL_GPL(kvm_read_guest_cached
);
1625 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
1627 return kvm_write_guest_page(kvm
, gfn
, (const void *) empty_zero_page
,
1630 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
1632 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
1634 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1636 int offset
= offset_in_page(gpa
);
1639 while ((seg
= next_segment(len
, offset
)) != 0) {
1640 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
1649 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
1651 void mark_page_dirty_in_slot(struct kvm
*kvm
, struct kvm_memory_slot
*memslot
,
1654 if (memslot
&& memslot
->dirty_bitmap
) {
1655 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
1657 set_bit_le(rel_gfn
, memslot
->dirty_bitmap
);
1661 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
1663 struct kvm_memory_slot
*memslot
;
1665 memslot
= gfn_to_memslot(kvm
, gfn
);
1666 mark_page_dirty_in_slot(kvm
, memslot
, gfn
);
1670 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1672 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
1677 prepare_to_wait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
1679 if (kvm_arch_vcpu_runnable(vcpu
)) {
1680 kvm_make_request(KVM_REQ_UNHALT
, vcpu
);
1683 if (kvm_cpu_has_pending_timer(vcpu
))
1685 if (signal_pending(current
))
1691 finish_wait(&vcpu
->wq
, &wait
);
1696 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
1698 void kvm_vcpu_kick(struct kvm_vcpu
*vcpu
)
1701 int cpu
= vcpu
->cpu
;
1702 wait_queue_head_t
*wqp
;
1704 wqp
= kvm_arch_vcpu_wq(vcpu
);
1705 if (waitqueue_active(wqp
)) {
1706 wake_up_interruptible(wqp
);
1707 ++vcpu
->stat
.halt_wakeup
;
1711 if (cpu
!= me
&& (unsigned)cpu
< nr_cpu_ids
&& cpu_online(cpu
))
1712 if (kvm_arch_vcpu_should_kick(vcpu
))
1713 smp_send_reschedule(cpu
);
1716 EXPORT_SYMBOL_GPL(kvm_vcpu_kick
);
1717 #endif /* !CONFIG_S390 */
1719 void kvm_resched(struct kvm_vcpu
*vcpu
)
1721 if (!need_resched())
1725 EXPORT_SYMBOL_GPL(kvm_resched
);
1727 bool kvm_vcpu_yield_to(struct kvm_vcpu
*target
)
1730 struct task_struct
*task
= NULL
;
1734 pid
= rcu_dereference(target
->pid
);
1736 task
= get_pid_task(target
->pid
, PIDTYPE_PID
);
1740 if (task
->flags
& PF_VCPU
) {
1741 put_task_struct(task
);
1744 ret
= yield_to(task
, 1);
1745 put_task_struct(task
);
1749 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to
);
1751 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
1753 * Helper that checks whether a VCPU is eligible for directed yield.
1754 * Most eligible candidate to yield is decided by following heuristics:
1756 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
1757 * (preempted lock holder), indicated by @in_spin_loop.
1758 * Set at the beiginning and cleared at the end of interception/PLE handler.
1760 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
1761 * chance last time (mostly it has become eligible now since we have probably
1762 * yielded to lockholder in last iteration. This is done by toggling
1763 * @dy_eligible each time a VCPU checked for eligibility.)
1765 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
1766 * to preempted lock-holder could result in wrong VCPU selection and CPU
1767 * burning. Giving priority for a potential lock-holder increases lock
1770 * Since algorithm is based on heuristics, accessing another VCPU data without
1771 * locking does not harm. It may result in trying to yield to same VCPU, fail
1772 * and continue with next VCPU and so on.
1774 bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu
*vcpu
)
1778 eligible
= !vcpu
->spin_loop
.in_spin_loop
||
1779 (vcpu
->spin_loop
.in_spin_loop
&&
1780 vcpu
->spin_loop
.dy_eligible
);
1782 if (vcpu
->spin_loop
.in_spin_loop
)
1783 kvm_vcpu_set_dy_eligible(vcpu
, !vcpu
->spin_loop
.dy_eligible
);
1789 void kvm_vcpu_on_spin(struct kvm_vcpu
*me
)
1791 struct kvm
*kvm
= me
->kvm
;
1792 struct kvm_vcpu
*vcpu
;
1793 int last_boosted_vcpu
= me
->kvm
->last_boosted_vcpu
;
1799 kvm_vcpu_set_in_spin_loop(me
, true);
1801 * We boost the priority of a VCPU that is runnable but not
1802 * currently running, because it got preempted by something
1803 * else and called schedule in __vcpu_run. Hopefully that
1804 * VCPU is holding the lock that we need and will release it.
1805 * We approximate round-robin by starting at the last boosted VCPU.
1807 for (pass
= 0; pass
< 2 && !yielded
&& try; pass
++) {
1808 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
1809 if (!pass
&& i
<= last_boosted_vcpu
) {
1810 i
= last_boosted_vcpu
;
1812 } else if (pass
&& i
> last_boosted_vcpu
)
1814 if (!ACCESS_ONCE(vcpu
->preempted
))
1818 if (waitqueue_active(&vcpu
->wq
))
1820 if (!kvm_vcpu_eligible_for_directed_yield(vcpu
))
1823 yielded
= kvm_vcpu_yield_to(vcpu
);
1825 kvm
->last_boosted_vcpu
= i
;
1827 } else if (yielded
< 0) {
1834 kvm_vcpu_set_in_spin_loop(me
, false);
1836 /* Ensure vcpu is not eligible during next spinloop */
1837 kvm_vcpu_set_dy_eligible(me
, false);
1839 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin
);
1841 static int kvm_vcpu_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1843 struct kvm_vcpu
*vcpu
= vma
->vm_file
->private_data
;
1846 if (vmf
->pgoff
== 0)
1847 page
= virt_to_page(vcpu
->run
);
1849 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
1850 page
= virt_to_page(vcpu
->arch
.pio_data
);
1852 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1853 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
1854 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
1857 return kvm_arch_vcpu_fault(vcpu
, vmf
);
1863 static const struct vm_operations_struct kvm_vcpu_vm_ops
= {
1864 .fault
= kvm_vcpu_fault
,
1867 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1869 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
1873 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
1875 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1877 kvm_put_kvm(vcpu
->kvm
);
1881 static struct file_operations kvm_vcpu_fops
= {
1882 .release
= kvm_vcpu_release
,
1883 .unlocked_ioctl
= kvm_vcpu_ioctl
,
1884 #ifdef CONFIG_COMPAT
1885 .compat_ioctl
= kvm_vcpu_compat_ioctl
,
1887 .mmap
= kvm_vcpu_mmap
,
1888 .llseek
= noop_llseek
,
1892 * Allocates an inode for the vcpu.
1894 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
1896 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops
, vcpu
, O_RDWR
);
1900 * Creates some virtual cpus. Good luck creating more than one.
1902 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, u32 id
)
1905 struct kvm_vcpu
*vcpu
, *v
;
1907 if (id
>= KVM_MAX_VCPUS
)
1910 vcpu
= kvm_arch_vcpu_create(kvm
, id
);
1912 return PTR_ERR(vcpu
);
1914 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
1916 r
= kvm_arch_vcpu_setup(vcpu
);
1920 mutex_lock(&kvm
->lock
);
1921 if (!kvm_vcpu_compatible(vcpu
)) {
1923 goto unlock_vcpu_destroy
;
1925 if (atomic_read(&kvm
->online_vcpus
) == KVM_MAX_VCPUS
) {
1927 goto unlock_vcpu_destroy
;
1930 kvm_for_each_vcpu(r
, v
, kvm
)
1931 if (v
->vcpu_id
== id
) {
1933 goto unlock_vcpu_destroy
;
1936 BUG_ON(kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)]);
1938 /* Now it's all set up, let userspace reach it */
1940 r
= create_vcpu_fd(vcpu
);
1943 goto unlock_vcpu_destroy
;
1946 kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)] = vcpu
;
1948 atomic_inc(&kvm
->online_vcpus
);
1950 mutex_unlock(&kvm
->lock
);
1951 kvm_arch_vcpu_postcreate(vcpu
);
1954 unlock_vcpu_destroy
:
1955 mutex_unlock(&kvm
->lock
);
1957 kvm_arch_vcpu_destroy(vcpu
);
1961 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
1964 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
1965 vcpu
->sigset_active
= 1;
1966 vcpu
->sigset
= *sigset
;
1968 vcpu
->sigset_active
= 0;
1972 static long kvm_vcpu_ioctl(struct file
*filp
,
1973 unsigned int ioctl
, unsigned long arg
)
1975 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1976 void __user
*argp
= (void __user
*)arg
;
1978 struct kvm_fpu
*fpu
= NULL
;
1979 struct kvm_sregs
*kvm_sregs
= NULL
;
1981 if (vcpu
->kvm
->mm
!= current
->mm
)
1984 #if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS)
1986 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1987 * so vcpu_load() would break it.
1989 if (ioctl
== KVM_S390_INTERRUPT
|| ioctl
== KVM_INTERRUPT
)
1990 return kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
1994 r
= vcpu_load(vcpu
);
2002 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
2003 trace_kvm_userspace_exit(vcpu
->run
->exit_reason
, r
);
2005 case KVM_GET_REGS
: {
2006 struct kvm_regs
*kvm_regs
;
2009 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
2012 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
2016 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
2023 case KVM_SET_REGS
: {
2024 struct kvm_regs
*kvm_regs
;
2027 kvm_regs
= memdup_user(argp
, sizeof(*kvm_regs
));
2028 if (IS_ERR(kvm_regs
)) {
2029 r
= PTR_ERR(kvm_regs
);
2032 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
2036 case KVM_GET_SREGS
: {
2037 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
2041 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
2045 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
2050 case KVM_SET_SREGS
: {
2051 kvm_sregs
= memdup_user(argp
, sizeof(*kvm_sregs
));
2052 if (IS_ERR(kvm_sregs
)) {
2053 r
= PTR_ERR(kvm_sregs
);
2057 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
2060 case KVM_GET_MP_STATE
: {
2061 struct kvm_mp_state mp_state
;
2063 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
2067 if (copy_to_user(argp
, &mp_state
, sizeof mp_state
))
2072 case KVM_SET_MP_STATE
: {
2073 struct kvm_mp_state mp_state
;
2076 if (copy_from_user(&mp_state
, argp
, sizeof mp_state
))
2078 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
2081 case KVM_TRANSLATE
: {
2082 struct kvm_translation tr
;
2085 if (copy_from_user(&tr
, argp
, sizeof tr
))
2087 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
2091 if (copy_to_user(argp
, &tr
, sizeof tr
))
2096 case KVM_SET_GUEST_DEBUG
: {
2097 struct kvm_guest_debug dbg
;
2100 if (copy_from_user(&dbg
, argp
, sizeof dbg
))
2102 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
2105 case KVM_SET_SIGNAL_MASK
: {
2106 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2107 struct kvm_signal_mask kvm_sigmask
;
2108 sigset_t sigset
, *p
;
2113 if (copy_from_user(&kvm_sigmask
, argp
,
2114 sizeof kvm_sigmask
))
2117 if (kvm_sigmask
.len
!= sizeof sigset
)
2120 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
2125 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, p
);
2129 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
2133 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
2137 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
2143 fpu
= memdup_user(argp
, sizeof(*fpu
));
2149 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
2153 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2162 #ifdef CONFIG_COMPAT
2163 static long kvm_vcpu_compat_ioctl(struct file
*filp
,
2164 unsigned int ioctl
, unsigned long arg
)
2166 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2167 void __user
*argp
= compat_ptr(arg
);
2170 if (vcpu
->kvm
->mm
!= current
->mm
)
2174 case KVM_SET_SIGNAL_MASK
: {
2175 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2176 struct kvm_signal_mask kvm_sigmask
;
2177 compat_sigset_t csigset
;
2182 if (copy_from_user(&kvm_sigmask
, argp
,
2183 sizeof kvm_sigmask
))
2186 if (kvm_sigmask
.len
!= sizeof csigset
)
2189 if (copy_from_user(&csigset
, sigmask_arg
->sigset
,
2192 sigset_from_compat(&sigset
, &csigset
);
2193 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
2195 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, NULL
);
2199 r
= kvm_vcpu_ioctl(filp
, ioctl
, arg
);
2207 static int kvm_device_ioctl_attr(struct kvm_device
*dev
,
2208 int (*accessor
)(struct kvm_device
*dev
,
2209 struct kvm_device_attr
*attr
),
2212 struct kvm_device_attr attr
;
2217 if (copy_from_user(&attr
, (void __user
*)arg
, sizeof(attr
)))
2220 return accessor(dev
, &attr
);
2223 static long kvm_device_ioctl(struct file
*filp
, unsigned int ioctl
,
2226 struct kvm_device
*dev
= filp
->private_data
;
2229 case KVM_SET_DEVICE_ATTR
:
2230 return kvm_device_ioctl_attr(dev
, dev
->ops
->set_attr
, arg
);
2231 case KVM_GET_DEVICE_ATTR
:
2232 return kvm_device_ioctl_attr(dev
, dev
->ops
->get_attr
, arg
);
2233 case KVM_HAS_DEVICE_ATTR
:
2234 return kvm_device_ioctl_attr(dev
, dev
->ops
->has_attr
, arg
);
2236 if (dev
->ops
->ioctl
)
2237 return dev
->ops
->ioctl(dev
, ioctl
, arg
);
2243 static int kvm_device_release(struct inode
*inode
, struct file
*filp
)
2245 struct kvm_device
*dev
= filp
->private_data
;
2246 struct kvm
*kvm
= dev
->kvm
;
2252 static const struct file_operations kvm_device_fops
= {
2253 .unlocked_ioctl
= kvm_device_ioctl
,
2254 #ifdef CONFIG_COMPAT
2255 .compat_ioctl
= kvm_device_ioctl
,
2257 .release
= kvm_device_release
,
2260 struct kvm_device
*kvm_device_from_filp(struct file
*filp
)
2262 if (filp
->f_op
!= &kvm_device_fops
)
2265 return filp
->private_data
;
2268 static int kvm_ioctl_create_device(struct kvm
*kvm
,
2269 struct kvm_create_device
*cd
)
2271 struct kvm_device_ops
*ops
= NULL
;
2272 struct kvm_device
*dev
;
2273 bool test
= cd
->flags
& KVM_CREATE_DEVICE_TEST
;
2277 #ifdef CONFIG_KVM_MPIC
2278 case KVM_DEV_TYPE_FSL_MPIC_20
:
2279 case KVM_DEV_TYPE_FSL_MPIC_42
:
2280 ops
= &kvm_mpic_ops
;
2283 #ifdef CONFIG_KVM_XICS
2284 case KVM_DEV_TYPE_XICS
:
2285 ops
= &kvm_xics_ops
;
2295 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
2302 ret
= ops
->create(dev
, cd
->type
);
2308 ret
= anon_inode_getfd(ops
->name
, &kvm_device_fops
, dev
, O_RDWR
);
2314 list_add(&dev
->vm_node
, &kvm
->devices
);
2320 static long kvm_vm_ioctl(struct file
*filp
,
2321 unsigned int ioctl
, unsigned long arg
)
2323 struct kvm
*kvm
= filp
->private_data
;
2324 void __user
*argp
= (void __user
*)arg
;
2327 if (kvm
->mm
!= current
->mm
)
2330 case KVM_CREATE_VCPU
:
2331 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
2333 case KVM_SET_USER_MEMORY_REGION
: {
2334 struct kvm_userspace_memory_region kvm_userspace_mem
;
2337 if (copy_from_user(&kvm_userspace_mem
, argp
,
2338 sizeof kvm_userspace_mem
))
2341 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
);
2344 case KVM_GET_DIRTY_LOG
: {
2345 struct kvm_dirty_log log
;
2348 if (copy_from_user(&log
, argp
, sizeof log
))
2350 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2353 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2354 case KVM_REGISTER_COALESCED_MMIO
: {
2355 struct kvm_coalesced_mmio_zone zone
;
2357 if (copy_from_user(&zone
, argp
, sizeof zone
))
2359 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
2362 case KVM_UNREGISTER_COALESCED_MMIO
: {
2363 struct kvm_coalesced_mmio_zone zone
;
2365 if (copy_from_user(&zone
, argp
, sizeof zone
))
2367 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
2372 struct kvm_irqfd data
;
2375 if (copy_from_user(&data
, argp
, sizeof data
))
2377 r
= kvm_irqfd(kvm
, &data
);
2380 case KVM_IOEVENTFD
: {
2381 struct kvm_ioeventfd data
;
2384 if (copy_from_user(&data
, argp
, sizeof data
))
2386 r
= kvm_ioeventfd(kvm
, &data
);
2389 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2390 case KVM_SET_BOOT_CPU_ID
:
2392 mutex_lock(&kvm
->lock
);
2393 if (atomic_read(&kvm
->online_vcpus
) != 0)
2396 kvm
->bsp_vcpu_id
= arg
;
2397 mutex_unlock(&kvm
->lock
);
2400 #ifdef CONFIG_HAVE_KVM_MSI
2401 case KVM_SIGNAL_MSI
: {
2405 if (copy_from_user(&msi
, argp
, sizeof msi
))
2407 r
= kvm_send_userspace_msi(kvm
, &msi
);
2411 #ifdef __KVM_HAVE_IRQ_LINE
2412 case KVM_IRQ_LINE_STATUS
:
2413 case KVM_IRQ_LINE
: {
2414 struct kvm_irq_level irq_event
;
2417 if (copy_from_user(&irq_event
, argp
, sizeof irq_event
))
2420 r
= kvm_vm_ioctl_irq_line(kvm
, &irq_event
,
2421 ioctl
== KVM_IRQ_LINE_STATUS
);
2426 if (ioctl
== KVM_IRQ_LINE_STATUS
) {
2427 if (copy_to_user(argp
, &irq_event
, sizeof irq_event
))
2435 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2436 case KVM_SET_GSI_ROUTING
: {
2437 struct kvm_irq_routing routing
;
2438 struct kvm_irq_routing __user
*urouting
;
2439 struct kvm_irq_routing_entry
*entries
;
2442 if (copy_from_user(&routing
, argp
, sizeof(routing
)))
2445 if (routing
.nr
>= KVM_MAX_IRQ_ROUTES
)
2450 entries
= vmalloc(routing
.nr
* sizeof(*entries
));
2455 if (copy_from_user(entries
, urouting
->entries
,
2456 routing
.nr
* sizeof(*entries
)))
2457 goto out_free_irq_routing
;
2458 r
= kvm_set_irq_routing(kvm
, entries
, routing
.nr
,
2460 out_free_irq_routing
:
2464 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
2465 case KVM_CREATE_DEVICE
: {
2466 struct kvm_create_device cd
;
2469 if (copy_from_user(&cd
, argp
, sizeof(cd
)))
2472 r
= kvm_ioctl_create_device(kvm
, &cd
);
2477 if (copy_to_user(argp
, &cd
, sizeof(cd
)))
2484 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
2486 r
= kvm_vm_ioctl_assigned_device(kvm
, ioctl
, arg
);
2492 #ifdef CONFIG_COMPAT
2493 struct compat_kvm_dirty_log
{
2497 compat_uptr_t dirty_bitmap
; /* one bit per page */
2502 static long kvm_vm_compat_ioctl(struct file
*filp
,
2503 unsigned int ioctl
, unsigned long arg
)
2505 struct kvm
*kvm
= filp
->private_data
;
2508 if (kvm
->mm
!= current
->mm
)
2511 case KVM_GET_DIRTY_LOG
: {
2512 struct compat_kvm_dirty_log compat_log
;
2513 struct kvm_dirty_log log
;
2516 if (copy_from_user(&compat_log
, (void __user
*)arg
,
2517 sizeof(compat_log
)))
2519 log
.slot
= compat_log
.slot
;
2520 log
.padding1
= compat_log
.padding1
;
2521 log
.padding2
= compat_log
.padding2
;
2522 log
.dirty_bitmap
= compat_ptr(compat_log
.dirty_bitmap
);
2524 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2528 r
= kvm_vm_ioctl(filp
, ioctl
, arg
);
2536 static int kvm_vm_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
2538 struct page
*page
[1];
2541 gfn_t gfn
= vmf
->pgoff
;
2542 struct kvm
*kvm
= vma
->vm_file
->private_data
;
2544 addr
= gfn_to_hva(kvm
, gfn
);
2545 if (kvm_is_error_hva(addr
))
2546 return VM_FAULT_SIGBUS
;
2548 npages
= get_user_pages(current
, current
->mm
, addr
, 1, 1, 0, page
,
2550 if (unlikely(npages
!= 1))
2551 return VM_FAULT_SIGBUS
;
2553 vmf
->page
= page
[0];
2557 static const struct vm_operations_struct kvm_vm_vm_ops
= {
2558 .fault
= kvm_vm_fault
,
2561 static int kvm_vm_mmap(struct file
*file
, struct vm_area_struct
*vma
)
2563 vma
->vm_ops
= &kvm_vm_vm_ops
;
2567 static struct file_operations kvm_vm_fops
= {
2568 .release
= kvm_vm_release
,
2569 .unlocked_ioctl
= kvm_vm_ioctl
,
2570 #ifdef CONFIG_COMPAT
2571 .compat_ioctl
= kvm_vm_compat_ioctl
,
2573 .mmap
= kvm_vm_mmap
,
2574 .llseek
= noop_llseek
,
2577 static int kvm_dev_ioctl_create_vm(unsigned long type
)
2582 kvm
= kvm_create_vm(type
);
2584 return PTR_ERR(kvm
);
2585 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2586 r
= kvm_coalesced_mmio_init(kvm
);
2592 r
= anon_inode_getfd("kvm-vm", &kvm_vm_fops
, kvm
, O_RDWR
);
2599 static long kvm_dev_ioctl_check_extension_generic(long arg
)
2602 case KVM_CAP_USER_MEMORY
:
2603 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
2604 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
2605 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2606 case KVM_CAP_SET_BOOT_CPU_ID
:
2608 case KVM_CAP_INTERNAL_ERROR_DATA
:
2609 #ifdef CONFIG_HAVE_KVM_MSI
2610 case KVM_CAP_SIGNAL_MSI
:
2612 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2613 case KVM_CAP_IRQFD_RESAMPLE
:
2616 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2617 case KVM_CAP_IRQ_ROUTING
:
2618 return KVM_MAX_IRQ_ROUTES
;
2623 return kvm_dev_ioctl_check_extension(arg
);
2626 static long kvm_dev_ioctl(struct file
*filp
,
2627 unsigned int ioctl
, unsigned long arg
)
2632 case KVM_GET_API_VERSION
:
2636 r
= KVM_API_VERSION
;
2639 r
= kvm_dev_ioctl_create_vm(arg
);
2641 case KVM_CHECK_EXTENSION
:
2642 r
= kvm_dev_ioctl_check_extension_generic(arg
);
2644 case KVM_GET_VCPU_MMAP_SIZE
:
2648 r
= PAGE_SIZE
; /* struct kvm_run */
2650 r
+= PAGE_SIZE
; /* pio data page */
2652 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2653 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
2656 case KVM_TRACE_ENABLE
:
2657 case KVM_TRACE_PAUSE
:
2658 case KVM_TRACE_DISABLE
:
2662 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
2668 static struct file_operations kvm_chardev_ops
= {
2669 .unlocked_ioctl
= kvm_dev_ioctl
,
2670 .compat_ioctl
= kvm_dev_ioctl
,
2671 .llseek
= noop_llseek
,
2674 static struct miscdevice kvm_dev
= {
2680 static void hardware_enable_nolock(void *junk
)
2682 int cpu
= raw_smp_processor_id();
2685 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2688 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
2690 r
= kvm_arch_hardware_enable(NULL
);
2693 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2694 atomic_inc(&hardware_enable_failed
);
2695 printk(KERN_INFO
"kvm: enabling virtualization on "
2696 "CPU%d failed\n", cpu
);
2700 static void hardware_enable(void *junk
)
2702 raw_spin_lock(&kvm_lock
);
2703 hardware_enable_nolock(junk
);
2704 raw_spin_unlock(&kvm_lock
);
2707 static void hardware_disable_nolock(void *junk
)
2709 int cpu
= raw_smp_processor_id();
2711 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2713 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2714 kvm_arch_hardware_disable(NULL
);
2717 static void hardware_disable(void *junk
)
2719 raw_spin_lock(&kvm_lock
);
2720 hardware_disable_nolock(junk
);
2721 raw_spin_unlock(&kvm_lock
);
2724 static void hardware_disable_all_nolock(void)
2726 BUG_ON(!kvm_usage_count
);
2729 if (!kvm_usage_count
)
2730 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2733 static void hardware_disable_all(void)
2735 raw_spin_lock(&kvm_lock
);
2736 hardware_disable_all_nolock();
2737 raw_spin_unlock(&kvm_lock
);
2740 static int hardware_enable_all(void)
2744 raw_spin_lock(&kvm_lock
);
2747 if (kvm_usage_count
== 1) {
2748 atomic_set(&hardware_enable_failed
, 0);
2749 on_each_cpu(hardware_enable_nolock
, NULL
, 1);
2751 if (atomic_read(&hardware_enable_failed
)) {
2752 hardware_disable_all_nolock();
2757 raw_spin_unlock(&kvm_lock
);
2762 static int kvm_cpu_hotplug(struct notifier_block
*notifier
, unsigned long val
,
2767 if (!kvm_usage_count
)
2770 val
&= ~CPU_TASKS_FROZEN
;
2773 printk(KERN_INFO
"kvm: disabling virtualization on CPU%d\n",
2775 hardware_disable(NULL
);
2778 printk(KERN_INFO
"kvm: enabling virtualization on CPU%d\n",
2780 hardware_enable(NULL
);
2786 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
2790 * Some (well, at least mine) BIOSes hang on reboot if
2793 * And Intel TXT required VMX off for all cpu when system shutdown.
2795 printk(KERN_INFO
"kvm: exiting hardware virtualization\n");
2796 kvm_rebooting
= true;
2797 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2801 static struct notifier_block kvm_reboot_notifier
= {
2802 .notifier_call
= kvm_reboot
,
2806 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
2810 for (i
= 0; i
< bus
->dev_count
; i
++) {
2811 struct kvm_io_device
*pos
= bus
->range
[i
].dev
;
2813 kvm_iodevice_destructor(pos
);
2818 static int kvm_io_bus_sort_cmp(const void *p1
, const void *p2
)
2820 const struct kvm_io_range
*r1
= p1
;
2821 const struct kvm_io_range
*r2
= p2
;
2823 if (r1
->addr
< r2
->addr
)
2825 if (r1
->addr
+ r1
->len
> r2
->addr
+ r2
->len
)
2830 static int kvm_io_bus_insert_dev(struct kvm_io_bus
*bus
, struct kvm_io_device
*dev
,
2831 gpa_t addr
, int len
)
2833 bus
->range
[bus
->dev_count
++] = (struct kvm_io_range
) {
2839 sort(bus
->range
, bus
->dev_count
, sizeof(struct kvm_io_range
),
2840 kvm_io_bus_sort_cmp
, NULL
);
2845 static int kvm_io_bus_get_first_dev(struct kvm_io_bus
*bus
,
2846 gpa_t addr
, int len
)
2848 struct kvm_io_range
*range
, key
;
2851 key
= (struct kvm_io_range
) {
2856 range
= bsearch(&key
, bus
->range
, bus
->dev_count
,
2857 sizeof(struct kvm_io_range
), kvm_io_bus_sort_cmp
);
2861 off
= range
- bus
->range
;
2863 while (off
> 0 && kvm_io_bus_sort_cmp(&key
, &bus
->range
[off
-1]) == 0)
2869 /* kvm_io_bus_write - called under kvm->slots_lock */
2870 int kvm_io_bus_write(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2871 int len
, const void *val
)
2874 struct kvm_io_bus
*bus
;
2875 struct kvm_io_range range
;
2877 range
= (struct kvm_io_range
) {
2882 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2883 idx
= kvm_io_bus_get_first_dev(bus
, addr
, len
);
2887 while (idx
< bus
->dev_count
&&
2888 kvm_io_bus_sort_cmp(&range
, &bus
->range
[idx
]) == 0) {
2889 if (!kvm_iodevice_write(bus
->range
[idx
].dev
, addr
, len
, val
))
2897 /* kvm_io_bus_read - called under kvm->slots_lock */
2898 int kvm_io_bus_read(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2902 struct kvm_io_bus
*bus
;
2903 struct kvm_io_range range
;
2905 range
= (struct kvm_io_range
) {
2910 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2911 idx
= kvm_io_bus_get_first_dev(bus
, addr
, len
);
2915 while (idx
< bus
->dev_count
&&
2916 kvm_io_bus_sort_cmp(&range
, &bus
->range
[idx
]) == 0) {
2917 if (!kvm_iodevice_read(bus
->range
[idx
].dev
, addr
, len
, val
))
2925 /* Caller must hold slots_lock. */
2926 int kvm_io_bus_register_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2927 int len
, struct kvm_io_device
*dev
)
2929 struct kvm_io_bus
*new_bus
, *bus
;
2931 bus
= kvm
->buses
[bus_idx
];
2932 if (bus
->dev_count
> NR_IOBUS_DEVS
- 1)
2935 new_bus
= kzalloc(sizeof(*bus
) + ((bus
->dev_count
+ 1) *
2936 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
2939 memcpy(new_bus
, bus
, sizeof(*bus
) + (bus
->dev_count
*
2940 sizeof(struct kvm_io_range
)));
2941 kvm_io_bus_insert_dev(new_bus
, dev
, addr
, len
);
2942 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
2943 synchronize_srcu_expedited(&kvm
->srcu
);
2949 /* Caller must hold slots_lock. */
2950 int kvm_io_bus_unregister_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
2951 struct kvm_io_device
*dev
)
2954 struct kvm_io_bus
*new_bus
, *bus
;
2956 bus
= kvm
->buses
[bus_idx
];
2958 for (i
= 0; i
< bus
->dev_count
; i
++)
2959 if (bus
->range
[i
].dev
== dev
) {
2967 new_bus
= kzalloc(sizeof(*bus
) + ((bus
->dev_count
- 1) *
2968 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
2972 memcpy(new_bus
, bus
, sizeof(*bus
) + i
* sizeof(struct kvm_io_range
));
2973 new_bus
->dev_count
--;
2974 memcpy(new_bus
->range
+ i
, bus
->range
+ i
+ 1,
2975 (new_bus
->dev_count
- i
) * sizeof(struct kvm_io_range
));
2977 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
2978 synchronize_srcu_expedited(&kvm
->srcu
);
2983 static struct notifier_block kvm_cpu_notifier
= {
2984 .notifier_call
= kvm_cpu_hotplug
,
2987 static int vm_stat_get(void *_offset
, u64
*val
)
2989 unsigned offset
= (long)_offset
;
2993 raw_spin_lock(&kvm_lock
);
2994 list_for_each_entry(kvm
, &vm_list
, vm_list
)
2995 *val
+= *(u32
*)((void *)kvm
+ offset
);
2996 raw_spin_unlock(&kvm_lock
);
3000 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, NULL
, "%llu\n");
3002 static int vcpu_stat_get(void *_offset
, u64
*val
)
3004 unsigned offset
= (long)_offset
;
3006 struct kvm_vcpu
*vcpu
;
3010 raw_spin_lock(&kvm_lock
);
3011 list_for_each_entry(kvm
, &vm_list
, vm_list
)
3012 kvm_for_each_vcpu(i
, vcpu
, kvm
)
3013 *val
+= *(u32
*)((void *)vcpu
+ offset
);
3015 raw_spin_unlock(&kvm_lock
);
3019 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, NULL
, "%llu\n");
3021 static const struct file_operations
*stat_fops
[] = {
3022 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
3023 [KVM_STAT_VM
] = &vm_stat_fops
,
3026 static int kvm_init_debug(void)
3029 struct kvm_stats_debugfs_item
*p
;
3031 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
3032 if (kvm_debugfs_dir
== NULL
)
3035 for (p
= debugfs_entries
; p
->name
; ++p
) {
3036 p
->dentry
= debugfs_create_file(p
->name
, 0444, kvm_debugfs_dir
,
3037 (void *)(long)p
->offset
,
3038 stat_fops
[p
->kind
]);
3039 if (p
->dentry
== NULL
)
3046 debugfs_remove_recursive(kvm_debugfs_dir
);
3051 static void kvm_exit_debug(void)
3053 struct kvm_stats_debugfs_item
*p
;
3055 for (p
= debugfs_entries
; p
->name
; ++p
)
3056 debugfs_remove(p
->dentry
);
3057 debugfs_remove(kvm_debugfs_dir
);
3060 static int kvm_suspend(void)
3062 if (kvm_usage_count
)
3063 hardware_disable_nolock(NULL
);
3067 static void kvm_resume(void)
3069 if (kvm_usage_count
) {
3070 WARN_ON(raw_spin_is_locked(&kvm_lock
));
3071 hardware_enable_nolock(NULL
);
3075 static struct syscore_ops kvm_syscore_ops
= {
3076 .suspend
= kvm_suspend
,
3077 .resume
= kvm_resume
,
3081 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
3083 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
3086 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
3088 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
3089 if (vcpu
->preempted
)
3090 vcpu
->preempted
= false;
3092 kvm_arch_vcpu_load(vcpu
, cpu
);
3095 static void kvm_sched_out(struct preempt_notifier
*pn
,
3096 struct task_struct
*next
)
3098 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
3100 if (current
->state
== TASK_RUNNING
)
3101 vcpu
->preempted
= true;
3102 kvm_arch_vcpu_put(vcpu
);
3105 int kvm_init(void *opaque
, unsigned vcpu_size
, unsigned vcpu_align
,
3106 struct module
*module
)
3111 r
= kvm_arch_init(opaque
);
3116 * kvm_arch_init makes sure there's at most one caller
3117 * for architectures that support multiple implementations,
3118 * like intel and amd on x86.
3119 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
3120 * conflicts in case kvm is already setup for another implementation.
3122 r
= kvm_irqfd_init();
3126 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
3131 r
= kvm_arch_hardware_setup();
3135 for_each_online_cpu(cpu
) {
3136 smp_call_function_single(cpu
,
3137 kvm_arch_check_processor_compat
,
3143 r
= register_cpu_notifier(&kvm_cpu_notifier
);
3146 register_reboot_notifier(&kvm_reboot_notifier
);
3148 /* A kmem cache lets us meet the alignment requirements of fx_save. */
3150 vcpu_align
= __alignof__(struct kvm_vcpu
);
3151 kvm_vcpu_cache
= kmem_cache_create("kvm_vcpu", vcpu_size
, vcpu_align
,
3153 if (!kvm_vcpu_cache
) {
3158 r
= kvm_async_pf_init();
3162 kvm_chardev_ops
.owner
= module
;
3163 kvm_vm_fops
.owner
= module
;
3164 kvm_vcpu_fops
.owner
= module
;
3166 r
= misc_register(&kvm_dev
);
3168 printk(KERN_ERR
"kvm: misc device register failed\n");
3172 register_syscore_ops(&kvm_syscore_ops
);
3174 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
3175 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
3177 r
= kvm_init_debug();
3179 printk(KERN_ERR
"kvm: create debugfs files failed\n");
3186 unregister_syscore_ops(&kvm_syscore_ops
);
3188 kvm_async_pf_deinit();
3190 kmem_cache_destroy(kvm_vcpu_cache
);
3192 unregister_reboot_notifier(&kvm_reboot_notifier
);
3193 unregister_cpu_notifier(&kvm_cpu_notifier
);
3196 kvm_arch_hardware_unsetup();
3198 free_cpumask_var(cpus_hardware_enabled
);
3206 EXPORT_SYMBOL_GPL(kvm_init
);
3211 misc_deregister(&kvm_dev
);
3212 kmem_cache_destroy(kvm_vcpu_cache
);
3213 kvm_async_pf_deinit();
3214 unregister_syscore_ops(&kvm_syscore_ops
);
3215 unregister_reboot_notifier(&kvm_reboot_notifier
);
3216 unregister_cpu_notifier(&kvm_cpu_notifier
);
3217 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3218 kvm_arch_hardware_unsetup();
3221 free_cpumask_var(cpus_hardware_enabled
);
3223 EXPORT_SYMBOL_GPL(kvm_exit
);