2 * Kernel-based Virtual Machine driver for Linux
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
7 * Copyright (C) 2006 Qumranet, Inc.
8 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
11 * Avi Kivity <avi@qumranet.com>
12 * Yaniv Kamay <yaniv@qumranet.com>
14 * This work is licensed under the terms of the GNU GPL, version 2. See
15 * the COPYING file in the top-level directory.
21 #include <linux/kvm_host.h>
22 #include <linux/kvm.h>
23 #include <linux/module.h>
24 #include <linux/errno.h>
25 #include <linux/percpu.h>
27 #include <linux/miscdevice.h>
28 #include <linux/vmalloc.h>
29 #include <linux/reboot.h>
30 #include <linux/debugfs.h>
31 #include <linux/highmem.h>
32 #include <linux/file.h>
33 #include <linux/syscore_ops.h>
34 #include <linux/cpu.h>
35 #include <linux/sched.h>
36 #include <linux/cpumask.h>
37 #include <linux/smp.h>
38 #include <linux/anon_inodes.h>
39 #include <linux/profile.h>
40 #include <linux/kvm_para.h>
41 #include <linux/pagemap.h>
42 #include <linux/mman.h>
43 #include <linux/swap.h>
44 #include <linux/bitops.h>
45 #include <linux/spinlock.h>
46 #include <linux/compat.h>
47 #include <linux/srcu.h>
48 #include <linux/hugetlb.h>
49 #include <linux/slab.h>
50 #include <linux/sort.h>
51 #include <linux/bsearch.h>
53 #include <asm/processor.h>
55 #include <asm/uaccess.h>
56 #include <asm/pgtable.h>
58 #include "coalesced_mmio.h"
61 #define CREATE_TRACE_POINTS
62 #include <trace/events/kvm.h>
64 MODULE_AUTHOR("Qumranet");
65 MODULE_LICENSE("GPL");
70 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
73 DEFINE_RAW_SPINLOCK(kvm_lock
);
76 static cpumask_var_t cpus_hardware_enabled
;
77 static int kvm_usage_count
= 0;
78 static atomic_t hardware_enable_failed
;
80 struct kmem_cache
*kvm_vcpu_cache
;
81 EXPORT_SYMBOL_GPL(kvm_vcpu_cache
);
83 static __read_mostly
struct preempt_ops kvm_preempt_ops
;
85 struct dentry
*kvm_debugfs_dir
;
87 static long kvm_vcpu_ioctl(struct file
*file
, unsigned int ioctl
,
90 static long kvm_vcpu_compat_ioctl(struct file
*file
, unsigned int ioctl
,
93 static int hardware_enable_all(void);
94 static void hardware_disable_all(void);
96 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
);
99 EXPORT_SYMBOL_GPL(kvm_rebooting
);
101 static bool largepages_enabled
= true;
103 bool kvm_is_mmio_pfn(pfn_t pfn
)
105 if (pfn_valid(pfn
)) {
107 struct page
*tail
= pfn_to_page(pfn
);
108 struct page
*head
= compound_trans_head(tail
);
109 reserved
= PageReserved(head
);
112 * "head" is not a dangling pointer
113 * (compound_trans_head takes care of that)
114 * but the hugepage may have been splitted
115 * from under us (and we may not hold a
116 * reference count on the head page so it can
117 * be reused before we run PageReferenced), so
118 * we've to check PageTail before returning
125 return PageReserved(tail
);
132 * Switches to specified vcpu, until a matching vcpu_put()
134 int vcpu_load(struct kvm_vcpu
*vcpu
)
138 if (mutex_lock_killable(&vcpu
->mutex
))
140 if (unlikely(vcpu
->pid
!= current
->pids
[PIDTYPE_PID
].pid
)) {
141 /* The thread running this VCPU changed. */
142 struct pid
*oldpid
= vcpu
->pid
;
143 struct pid
*newpid
= get_task_pid(current
, PIDTYPE_PID
);
144 rcu_assign_pointer(vcpu
->pid
, newpid
);
149 preempt_notifier_register(&vcpu
->preempt_notifier
);
150 kvm_arch_vcpu_load(vcpu
, cpu
);
155 void vcpu_put(struct kvm_vcpu
*vcpu
)
158 kvm_arch_vcpu_put(vcpu
);
159 preempt_notifier_unregister(&vcpu
->preempt_notifier
);
161 mutex_unlock(&vcpu
->mutex
);
164 static void ack_flush(void *_completed
)
168 static bool make_all_cpus_request(struct kvm
*kvm
, unsigned int req
)
173 struct kvm_vcpu
*vcpu
;
175 zalloc_cpumask_var(&cpus
, GFP_ATOMIC
);
178 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
179 kvm_make_request(req
, vcpu
);
182 /* Set ->requests bit before we read ->mode */
185 if (cpus
!= NULL
&& cpu
!= -1 && cpu
!= me
&&
186 kvm_vcpu_exiting_guest_mode(vcpu
) != OUTSIDE_GUEST_MODE
)
187 cpumask_set_cpu(cpu
, cpus
);
189 if (unlikely(cpus
== NULL
))
190 smp_call_function_many(cpu_online_mask
, ack_flush
, NULL
, 1);
191 else if (!cpumask_empty(cpus
))
192 smp_call_function_many(cpus
, ack_flush
, NULL
, 1);
196 free_cpumask_var(cpus
);
200 void kvm_flush_remote_tlbs(struct kvm
*kvm
)
202 long dirty_count
= kvm
->tlbs_dirty
;
205 if (make_all_cpus_request(kvm
, KVM_REQ_TLB_FLUSH
))
206 ++kvm
->stat
.remote_tlb_flush
;
207 cmpxchg(&kvm
->tlbs_dirty
, dirty_count
, 0);
210 void kvm_reload_remote_mmus(struct kvm
*kvm
)
212 make_all_cpus_request(kvm
, KVM_REQ_MMU_RELOAD
);
215 void kvm_make_mclock_inprogress_request(struct kvm
*kvm
)
217 make_all_cpus_request(kvm
, KVM_REQ_MCLOCK_INPROGRESS
);
220 void kvm_make_update_eoibitmap_request(struct kvm
*kvm
)
222 make_all_cpus_request(kvm
, KVM_REQ_EOIBITMAP
);
225 int kvm_vcpu_init(struct kvm_vcpu
*vcpu
, struct kvm
*kvm
, unsigned id
)
230 mutex_init(&vcpu
->mutex
);
235 init_waitqueue_head(&vcpu
->wq
);
236 kvm_async_pf_vcpu_init(vcpu
);
238 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
243 vcpu
->run
= page_address(page
);
245 kvm_vcpu_set_in_spin_loop(vcpu
, false);
246 kvm_vcpu_set_dy_eligible(vcpu
, false);
248 r
= kvm_arch_vcpu_init(vcpu
);
254 free_page((unsigned long)vcpu
->run
);
258 EXPORT_SYMBOL_GPL(kvm_vcpu_init
);
260 void kvm_vcpu_uninit(struct kvm_vcpu
*vcpu
)
263 kvm_arch_vcpu_uninit(vcpu
);
264 free_page((unsigned long)vcpu
->run
);
266 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit
);
268 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
269 static inline struct kvm
*mmu_notifier_to_kvm(struct mmu_notifier
*mn
)
271 return container_of(mn
, struct kvm
, mmu_notifier
);
274 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier
*mn
,
275 struct mm_struct
*mm
,
276 unsigned long address
)
278 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
279 int need_tlb_flush
, idx
;
282 * When ->invalidate_page runs, the linux pte has been zapped
283 * already but the page is still allocated until
284 * ->invalidate_page returns. So if we increase the sequence
285 * here the kvm page fault will notice if the spte can't be
286 * established because the page is going to be freed. If
287 * instead the kvm page fault establishes the spte before
288 * ->invalidate_page runs, kvm_unmap_hva will release it
291 * The sequence increase only need to be seen at spin_unlock
292 * time, and not at spin_lock time.
294 * Increasing the sequence after the spin_unlock would be
295 * unsafe because the kvm page fault could then establish the
296 * pte after kvm_unmap_hva returned, without noticing the page
297 * is going to be freed.
299 idx
= srcu_read_lock(&kvm
->srcu
);
300 spin_lock(&kvm
->mmu_lock
);
302 kvm
->mmu_notifier_seq
++;
303 need_tlb_flush
= kvm_unmap_hva(kvm
, address
) | kvm
->tlbs_dirty
;
304 /* we've to flush the tlb before the pages can be freed */
306 kvm_flush_remote_tlbs(kvm
);
308 spin_unlock(&kvm
->mmu_lock
);
309 srcu_read_unlock(&kvm
->srcu
, idx
);
312 static void kvm_mmu_notifier_change_pte(struct mmu_notifier
*mn
,
313 struct mm_struct
*mm
,
314 unsigned long address
,
317 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
320 idx
= srcu_read_lock(&kvm
->srcu
);
321 spin_lock(&kvm
->mmu_lock
);
322 kvm
->mmu_notifier_seq
++;
323 kvm_set_spte_hva(kvm
, address
, pte
);
324 spin_unlock(&kvm
->mmu_lock
);
325 srcu_read_unlock(&kvm
->srcu
, idx
);
328 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier
*mn
,
329 struct mm_struct
*mm
,
333 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
334 int need_tlb_flush
= 0, idx
;
336 idx
= srcu_read_lock(&kvm
->srcu
);
337 spin_lock(&kvm
->mmu_lock
);
339 * The count increase must become visible at unlock time as no
340 * spte can be established without taking the mmu_lock and
341 * count is also read inside the mmu_lock critical section.
343 kvm
->mmu_notifier_count
++;
344 need_tlb_flush
= kvm_unmap_hva_range(kvm
, start
, end
);
345 need_tlb_flush
|= kvm
->tlbs_dirty
;
346 /* we've to flush the tlb before the pages can be freed */
348 kvm_flush_remote_tlbs(kvm
);
350 spin_unlock(&kvm
->mmu_lock
);
351 srcu_read_unlock(&kvm
->srcu
, idx
);
354 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier
*mn
,
355 struct mm_struct
*mm
,
359 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
361 spin_lock(&kvm
->mmu_lock
);
363 * This sequence increase will notify the kvm page fault that
364 * the page that is going to be mapped in the spte could have
367 kvm
->mmu_notifier_seq
++;
370 * The above sequence increase must be visible before the
371 * below count decrease, which is ensured by the smp_wmb above
372 * in conjunction with the smp_rmb in mmu_notifier_retry().
374 kvm
->mmu_notifier_count
--;
375 spin_unlock(&kvm
->mmu_lock
);
377 BUG_ON(kvm
->mmu_notifier_count
< 0);
380 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier
*mn
,
381 struct mm_struct
*mm
,
382 unsigned long address
)
384 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
387 idx
= srcu_read_lock(&kvm
->srcu
);
388 spin_lock(&kvm
->mmu_lock
);
390 young
= kvm_age_hva(kvm
, address
);
392 kvm_flush_remote_tlbs(kvm
);
394 spin_unlock(&kvm
->mmu_lock
);
395 srcu_read_unlock(&kvm
->srcu
, idx
);
400 static int kvm_mmu_notifier_test_young(struct mmu_notifier
*mn
,
401 struct mm_struct
*mm
,
402 unsigned long address
)
404 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
407 idx
= srcu_read_lock(&kvm
->srcu
);
408 spin_lock(&kvm
->mmu_lock
);
409 young
= kvm_test_age_hva(kvm
, address
);
410 spin_unlock(&kvm
->mmu_lock
);
411 srcu_read_unlock(&kvm
->srcu
, idx
);
416 static void kvm_mmu_notifier_release(struct mmu_notifier
*mn
,
417 struct mm_struct
*mm
)
419 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
422 idx
= srcu_read_lock(&kvm
->srcu
);
423 kvm_arch_flush_shadow_all(kvm
);
424 srcu_read_unlock(&kvm
->srcu
, idx
);
427 static const struct mmu_notifier_ops kvm_mmu_notifier_ops
= {
428 .invalidate_page
= kvm_mmu_notifier_invalidate_page
,
429 .invalidate_range_start
= kvm_mmu_notifier_invalidate_range_start
,
430 .invalidate_range_end
= kvm_mmu_notifier_invalidate_range_end
,
431 .clear_flush_young
= kvm_mmu_notifier_clear_flush_young
,
432 .test_young
= kvm_mmu_notifier_test_young
,
433 .change_pte
= kvm_mmu_notifier_change_pte
,
434 .release
= kvm_mmu_notifier_release
,
437 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
439 kvm
->mmu_notifier
.ops
= &kvm_mmu_notifier_ops
;
440 return mmu_notifier_register(&kvm
->mmu_notifier
, current
->mm
);
443 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
445 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
450 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
452 static void kvm_init_memslots_id(struct kvm
*kvm
)
455 struct kvm_memslots
*slots
= kvm
->memslots
;
457 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
458 slots
->id_to_index
[i
] = slots
->memslots
[i
].id
= i
;
461 static struct kvm
*kvm_create_vm(unsigned long type
)
464 struct kvm
*kvm
= kvm_arch_alloc_vm();
467 return ERR_PTR(-ENOMEM
);
469 r
= kvm_arch_init_vm(kvm
, type
);
471 goto out_err_nodisable
;
473 r
= hardware_enable_all();
475 goto out_err_nodisable
;
477 #ifdef CONFIG_HAVE_KVM_IRQCHIP
478 INIT_HLIST_HEAD(&kvm
->mask_notifier_list
);
479 INIT_HLIST_HEAD(&kvm
->irq_ack_notifier_list
);
482 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM
> SHRT_MAX
);
485 kvm
->memslots
= kzalloc(sizeof(struct kvm_memslots
), GFP_KERNEL
);
488 kvm_init_memslots_id(kvm
);
489 if (init_srcu_struct(&kvm
->srcu
))
491 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
492 kvm
->buses
[i
] = kzalloc(sizeof(struct kvm_io_bus
),
498 spin_lock_init(&kvm
->mmu_lock
);
499 kvm
->mm
= current
->mm
;
500 atomic_inc(&kvm
->mm
->mm_count
);
501 kvm_eventfd_init(kvm
);
502 mutex_init(&kvm
->lock
);
503 mutex_init(&kvm
->irq_lock
);
504 mutex_init(&kvm
->slots_lock
);
505 atomic_set(&kvm
->users_count
, 1);
507 r
= kvm_init_mmu_notifier(kvm
);
511 raw_spin_lock(&kvm_lock
);
512 list_add(&kvm
->vm_list
, &vm_list
);
513 raw_spin_unlock(&kvm_lock
);
518 cleanup_srcu_struct(&kvm
->srcu
);
520 hardware_disable_all();
522 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
523 kfree(kvm
->buses
[i
]);
524 kfree(kvm
->memslots
);
525 kvm_arch_free_vm(kvm
);
530 * Avoid using vmalloc for a small buffer.
531 * Should not be used when the size is statically known.
533 void *kvm_kvzalloc(unsigned long size
)
535 if (size
> PAGE_SIZE
)
536 return vzalloc(size
);
538 return kzalloc(size
, GFP_KERNEL
);
541 void kvm_kvfree(const void *addr
)
543 if (is_vmalloc_addr(addr
))
549 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot
*memslot
)
551 if (!memslot
->dirty_bitmap
)
554 kvm_kvfree(memslot
->dirty_bitmap
);
555 memslot
->dirty_bitmap
= NULL
;
559 * Free any memory in @free but not in @dont.
561 static void kvm_free_physmem_slot(struct kvm_memory_slot
*free
,
562 struct kvm_memory_slot
*dont
)
564 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
565 kvm_destroy_dirty_bitmap(free
);
567 kvm_arch_free_memslot(free
, dont
);
572 void kvm_free_physmem(struct kvm
*kvm
)
574 struct kvm_memslots
*slots
= kvm
->memslots
;
575 struct kvm_memory_slot
*memslot
;
577 kvm_for_each_memslot(memslot
, slots
)
578 kvm_free_physmem_slot(memslot
, NULL
);
580 kfree(kvm
->memslots
);
583 static void kvm_destroy_vm(struct kvm
*kvm
)
586 struct mm_struct
*mm
= kvm
->mm
;
588 kvm_arch_sync_events(kvm
);
589 raw_spin_lock(&kvm_lock
);
590 list_del(&kvm
->vm_list
);
591 raw_spin_unlock(&kvm_lock
);
592 kvm_free_irq_routing(kvm
);
593 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
594 kvm_io_bus_destroy(kvm
->buses
[i
]);
595 kvm_coalesced_mmio_free(kvm
);
596 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
597 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
599 kvm_arch_flush_shadow_all(kvm
);
601 kvm_arch_destroy_vm(kvm
);
602 kvm_free_physmem(kvm
);
603 cleanup_srcu_struct(&kvm
->srcu
);
604 kvm_arch_free_vm(kvm
);
605 hardware_disable_all();
609 void kvm_get_kvm(struct kvm
*kvm
)
611 atomic_inc(&kvm
->users_count
);
613 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
615 void kvm_put_kvm(struct kvm
*kvm
)
617 if (atomic_dec_and_test(&kvm
->users_count
))
620 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
623 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
625 struct kvm
*kvm
= filp
->private_data
;
627 kvm_irqfd_release(kvm
);
634 * Allocation size is twice as large as the actual dirty bitmap size.
635 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
637 static int kvm_create_dirty_bitmap(struct kvm_memory_slot
*memslot
)
640 unsigned long dirty_bytes
= 2 * kvm_dirty_bitmap_bytes(memslot
);
642 memslot
->dirty_bitmap
= kvm_kvzalloc(dirty_bytes
);
643 if (!memslot
->dirty_bitmap
)
646 #endif /* !CONFIG_S390 */
650 static int cmp_memslot(const void *slot1
, const void *slot2
)
652 struct kvm_memory_slot
*s1
, *s2
;
654 s1
= (struct kvm_memory_slot
*)slot1
;
655 s2
= (struct kvm_memory_slot
*)slot2
;
657 if (s1
->npages
< s2
->npages
)
659 if (s1
->npages
> s2
->npages
)
666 * Sort the memslots base on its size, so the larger slots
667 * will get better fit.
669 static void sort_memslots(struct kvm_memslots
*slots
)
673 sort(slots
->memslots
, KVM_MEM_SLOTS_NUM
,
674 sizeof(struct kvm_memory_slot
), cmp_memslot
, NULL
);
676 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
677 slots
->id_to_index
[slots
->memslots
[i
].id
] = i
;
680 void update_memslots(struct kvm_memslots
*slots
, struct kvm_memory_slot
*new,
685 struct kvm_memory_slot
*old
= id_to_memslot(slots
, id
);
686 unsigned long npages
= old
->npages
;
689 if (new->npages
!= npages
)
690 sort_memslots(slots
);
693 slots
->generation
= last_generation
+ 1;
696 static int check_memory_region_flags(struct kvm_userspace_memory_region
*mem
)
698 u32 valid_flags
= KVM_MEM_LOG_DIRTY_PAGES
;
700 #ifdef KVM_CAP_READONLY_MEM
701 valid_flags
|= KVM_MEM_READONLY
;
704 if (mem
->flags
& ~valid_flags
)
710 static struct kvm_memslots
*install_new_memslots(struct kvm
*kvm
,
711 struct kvm_memslots
*slots
, struct kvm_memory_slot
*new)
713 struct kvm_memslots
*old_memslots
= kvm
->memslots
;
715 update_memslots(slots
, new, kvm
->memslots
->generation
);
716 rcu_assign_pointer(kvm
->memslots
, slots
);
717 synchronize_srcu_expedited(&kvm
->srcu
);
722 * KVM_SET_USER_MEMORY_REGION ioctl allows the following operations:
723 * - create a new memory slot
724 * - delete an existing memory slot
725 * - modify an existing memory slot
726 * -- move it in the guest physical memory space
727 * -- just change its flags
729 * Since flags can be changed by some of these operations, the following
730 * differentiation is the best we can do for __kvm_set_memory_region():
740 * Allocate some memory and give it an address in the guest physical address
743 * Discontiguous memory is allowed, mostly for framebuffers.
745 * Must be called holding mmap_sem for write.
747 int __kvm_set_memory_region(struct kvm
*kvm
,
748 struct kvm_userspace_memory_region
*mem
,
753 unsigned long npages
;
754 struct kvm_memory_slot
*slot
;
755 struct kvm_memory_slot old
, new;
756 struct kvm_memslots
*slots
= NULL
, *old_memslots
;
757 enum kvm_mr_change change
;
759 r
= check_memory_region_flags(mem
);
764 /* General sanity checks */
765 if (mem
->memory_size
& (PAGE_SIZE
- 1))
767 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
769 /* We can read the guest memory with __xxx_user() later on. */
771 ((mem
->userspace_addr
& (PAGE_SIZE
- 1)) ||
772 !access_ok(VERIFY_WRITE
,
773 (void __user
*)(unsigned long)mem
->userspace_addr
,
776 if (mem
->slot
>= KVM_MEM_SLOTS_NUM
)
778 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
781 slot
= id_to_memslot(kvm
->memslots
, mem
->slot
);
782 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
783 npages
= mem
->memory_size
>> PAGE_SHIFT
;
786 if (npages
> KVM_MEM_MAX_NR_PAGES
)
790 mem
->flags
&= ~KVM_MEM_LOG_DIRTY_PAGES
;
795 new.base_gfn
= base_gfn
;
797 new.flags
= mem
->flags
;
802 change
= KVM_MR_CREATE
;
803 else { /* Modify an existing slot. */
804 if ((mem
->userspace_addr
!= old
.userspace_addr
) ||
805 (npages
!= old
.npages
) ||
806 ((new.flags
^ old
.flags
) & KVM_MEM_READONLY
))
809 if (base_gfn
!= old
.base_gfn
)
810 change
= KVM_MR_MOVE
;
811 else if (new.flags
!= old
.flags
)
812 change
= KVM_MR_FLAGS_ONLY
;
813 else { /* Nothing to change. */
818 } else if (old
.npages
) {
819 change
= KVM_MR_DELETE
;
820 } else /* Modify a non-existent slot: disallowed. */
823 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
824 /* Check for overlaps */
826 kvm_for_each_memslot(slot
, kvm
->memslots
) {
827 if ((slot
->id
>= KVM_USER_MEM_SLOTS
) ||
828 (slot
->id
== mem
->slot
))
830 if (!((base_gfn
+ npages
<= slot
->base_gfn
) ||
831 (base_gfn
>= slot
->base_gfn
+ slot
->npages
)))
836 /* Free page dirty bitmap if unneeded */
837 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
838 new.dirty_bitmap
= NULL
;
841 if (change
== KVM_MR_CREATE
) {
842 new.userspace_addr
= mem
->userspace_addr
;
844 if (kvm_arch_create_memslot(&new, npages
))
848 /* Allocate page dirty bitmap if needed */
849 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
850 if (kvm_create_dirty_bitmap(&new) < 0)
854 if ((change
== KVM_MR_DELETE
) || (change
== KVM_MR_MOVE
)) {
856 slots
= kmemdup(kvm
->memslots
, sizeof(struct kvm_memslots
),
860 slot
= id_to_memslot(slots
, mem
->slot
);
861 slot
->flags
|= KVM_MEMSLOT_INVALID
;
863 old_memslots
= install_new_memslots(kvm
, slots
, NULL
);
865 /* slot was deleted or moved, clear iommu mapping */
866 kvm_iommu_unmap_pages(kvm
, &old
);
867 /* From this point no new shadow pages pointing to a deleted,
868 * or moved, memslot will be created.
870 * validation of sp->gfn happens in:
871 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
872 * - kvm_is_visible_gfn (mmu_check_roots)
874 kvm_arch_flush_shadow_memslot(kvm
, slot
);
875 slots
= old_memslots
;
878 r
= kvm_arch_prepare_memory_region(kvm
, &new, old
, mem
, user_alloc
);
884 * We can re-use the old_memslots from above, the only difference
885 * from the currently installed memslots is the invalid flag. This
886 * will get overwritten by update_memslots anyway.
889 slots
= kmemdup(kvm
->memslots
, sizeof(struct kvm_memslots
),
896 * IOMMU mapping: New slots need to be mapped. Old slots need to be
897 * un-mapped and re-mapped if their base changes. Since base change
898 * unmapping is handled above with slot deletion, mapping alone is
899 * needed here. Anything else the iommu might care about for existing
900 * slots (size changes, userspace addr changes and read-only flag
901 * changes) is disallowed above, so any other attribute changes getting
902 * here can be skipped.
904 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
905 r
= kvm_iommu_map_pages(kvm
, &new);
910 /* actual memory is freed via old in kvm_free_physmem_slot below */
911 if (change
== KVM_MR_DELETE
) {
912 new.dirty_bitmap
= NULL
;
913 memset(&new.arch
, 0, sizeof(new.arch
));
916 old_memslots
= install_new_memslots(kvm
, slots
, &new);
918 kvm_arch_commit_memory_region(kvm
, mem
, old
, user_alloc
);
920 kvm_free_physmem_slot(&old
, &new);
928 kvm_free_physmem_slot(&new, &old
);
932 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
934 int kvm_set_memory_region(struct kvm
*kvm
,
935 struct kvm_userspace_memory_region
*mem
,
940 mutex_lock(&kvm
->slots_lock
);
941 r
= __kvm_set_memory_region(kvm
, mem
, user_alloc
);
942 mutex_unlock(&kvm
->slots_lock
);
945 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
947 int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
949 kvm_userspace_memory_region
*mem
,
952 if (mem
->slot
>= KVM_USER_MEM_SLOTS
)
954 return kvm_set_memory_region(kvm
, mem
, user_alloc
);
957 int kvm_get_dirty_log(struct kvm
*kvm
,
958 struct kvm_dirty_log
*log
, int *is_dirty
)
960 struct kvm_memory_slot
*memslot
;
963 unsigned long any
= 0;
966 if (log
->slot
>= KVM_USER_MEM_SLOTS
)
969 memslot
= id_to_memslot(kvm
->memslots
, log
->slot
);
971 if (!memslot
->dirty_bitmap
)
974 n
= kvm_dirty_bitmap_bytes(memslot
);
976 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
977 any
= memslot
->dirty_bitmap
[i
];
980 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
991 bool kvm_largepages_enabled(void)
993 return largepages_enabled
;
996 void kvm_disable_largepages(void)
998 largepages_enabled
= false;
1000 EXPORT_SYMBOL_GPL(kvm_disable_largepages
);
1002 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
1004 return __gfn_to_memslot(kvm_memslots(kvm
), gfn
);
1006 EXPORT_SYMBOL_GPL(gfn_to_memslot
);
1008 int kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
1010 struct kvm_memory_slot
*memslot
= gfn_to_memslot(kvm
, gfn
);
1012 if (!memslot
|| memslot
->id
>= KVM_USER_MEM_SLOTS
||
1013 memslot
->flags
& KVM_MEMSLOT_INVALID
)
1018 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
1020 unsigned long kvm_host_page_size(struct kvm
*kvm
, gfn_t gfn
)
1022 struct vm_area_struct
*vma
;
1023 unsigned long addr
, size
;
1027 addr
= gfn_to_hva(kvm
, gfn
);
1028 if (kvm_is_error_hva(addr
))
1031 down_read(¤t
->mm
->mmap_sem
);
1032 vma
= find_vma(current
->mm
, addr
);
1036 size
= vma_kernel_pagesize(vma
);
1039 up_read(¤t
->mm
->mmap_sem
);
1044 static bool memslot_is_readonly(struct kvm_memory_slot
*slot
)
1046 return slot
->flags
& KVM_MEM_READONLY
;
1049 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1050 gfn_t
*nr_pages
, bool write
)
1052 if (!slot
|| slot
->flags
& KVM_MEMSLOT_INVALID
)
1053 return KVM_HVA_ERR_BAD
;
1055 if (memslot_is_readonly(slot
) && write
)
1056 return KVM_HVA_ERR_RO_BAD
;
1059 *nr_pages
= slot
->npages
- (gfn
- slot
->base_gfn
);
1061 return __gfn_to_hva_memslot(slot
, gfn
);
1064 static unsigned long gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1067 return __gfn_to_hva_many(slot
, gfn
, nr_pages
, true);
1070 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot
*slot
,
1073 return gfn_to_hva_many(slot
, gfn
, NULL
);
1075 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot
);
1077 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
1079 return gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, NULL
);
1081 EXPORT_SYMBOL_GPL(gfn_to_hva
);
1084 * The hva returned by this function is only allowed to be read.
1085 * It should pair with kvm_read_hva() or kvm_read_hva_atomic().
1087 static unsigned long gfn_to_hva_read(struct kvm
*kvm
, gfn_t gfn
)
1089 return __gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, NULL
, false);
1092 static int kvm_read_hva(void *data
, void __user
*hva
, int len
)
1094 return __copy_from_user(data
, hva
, len
);
1097 static int kvm_read_hva_atomic(void *data
, void __user
*hva
, int len
)
1099 return __copy_from_user_inatomic(data
, hva
, len
);
1102 int get_user_page_nowait(struct task_struct
*tsk
, struct mm_struct
*mm
,
1103 unsigned long start
, int write
, struct page
**page
)
1105 int flags
= FOLL_TOUCH
| FOLL_NOWAIT
| FOLL_HWPOISON
| FOLL_GET
;
1108 flags
|= FOLL_WRITE
;
1110 return __get_user_pages(tsk
, mm
, start
, 1, flags
, page
, NULL
, NULL
);
1113 static inline int check_user_page_hwpoison(unsigned long addr
)
1115 int rc
, flags
= FOLL_TOUCH
| FOLL_HWPOISON
| FOLL_WRITE
;
1117 rc
= __get_user_pages(current
, current
->mm
, addr
, 1,
1118 flags
, NULL
, NULL
, NULL
);
1119 return rc
== -EHWPOISON
;
1123 * The atomic path to get the writable pfn which will be stored in @pfn,
1124 * true indicates success, otherwise false is returned.
1126 static bool hva_to_pfn_fast(unsigned long addr
, bool atomic
, bool *async
,
1127 bool write_fault
, bool *writable
, pfn_t
*pfn
)
1129 struct page
*page
[1];
1132 if (!(async
|| atomic
))
1136 * Fast pin a writable pfn only if it is a write fault request
1137 * or the caller allows to map a writable pfn for a read fault
1140 if (!(write_fault
|| writable
))
1143 npages
= __get_user_pages_fast(addr
, 1, 1, page
);
1145 *pfn
= page_to_pfn(page
[0]);
1156 * The slow path to get the pfn of the specified host virtual address,
1157 * 1 indicates success, -errno is returned if error is detected.
1159 static int hva_to_pfn_slow(unsigned long addr
, bool *async
, bool write_fault
,
1160 bool *writable
, pfn_t
*pfn
)
1162 struct page
*page
[1];
1168 *writable
= write_fault
;
1171 down_read(¤t
->mm
->mmap_sem
);
1172 npages
= get_user_page_nowait(current
, current
->mm
,
1173 addr
, write_fault
, page
);
1174 up_read(¤t
->mm
->mmap_sem
);
1176 npages
= get_user_pages_fast(addr
, 1, write_fault
,
1181 /* map read fault as writable if possible */
1182 if (unlikely(!write_fault
) && writable
) {
1183 struct page
*wpage
[1];
1185 npages
= __get_user_pages_fast(addr
, 1, 1, wpage
);
1194 *pfn
= page_to_pfn(page
[0]);
1198 static bool vma_is_valid(struct vm_area_struct
*vma
, bool write_fault
)
1200 if (unlikely(!(vma
->vm_flags
& VM_READ
)))
1203 if (write_fault
&& (unlikely(!(vma
->vm_flags
& VM_WRITE
))))
1210 * Pin guest page in memory and return its pfn.
1211 * @addr: host virtual address which maps memory to the guest
1212 * @atomic: whether this function can sleep
1213 * @async: whether this function need to wait IO complete if the
1214 * host page is not in the memory
1215 * @write_fault: whether we should get a writable host page
1216 * @writable: whether it allows to map a writable host page for !@write_fault
1218 * The function will map a writable host page for these two cases:
1219 * 1): @write_fault = true
1220 * 2): @write_fault = false && @writable, @writable will tell the caller
1221 * whether the mapping is writable.
1223 static pfn_t
hva_to_pfn(unsigned long addr
, bool atomic
, bool *async
,
1224 bool write_fault
, bool *writable
)
1226 struct vm_area_struct
*vma
;
1230 /* we can do it either atomically or asynchronously, not both */
1231 BUG_ON(atomic
&& async
);
1233 if (hva_to_pfn_fast(addr
, atomic
, async
, write_fault
, writable
, &pfn
))
1237 return KVM_PFN_ERR_FAULT
;
1239 npages
= hva_to_pfn_slow(addr
, async
, write_fault
, writable
, &pfn
);
1243 down_read(¤t
->mm
->mmap_sem
);
1244 if (npages
== -EHWPOISON
||
1245 (!async
&& check_user_page_hwpoison(addr
))) {
1246 pfn
= KVM_PFN_ERR_HWPOISON
;
1250 vma
= find_vma_intersection(current
->mm
, addr
, addr
+ 1);
1253 pfn
= KVM_PFN_ERR_FAULT
;
1254 else if ((vma
->vm_flags
& VM_PFNMAP
)) {
1255 pfn
= ((addr
- vma
->vm_start
) >> PAGE_SHIFT
) +
1257 BUG_ON(!kvm_is_mmio_pfn(pfn
));
1259 if (async
&& vma_is_valid(vma
, write_fault
))
1261 pfn
= KVM_PFN_ERR_FAULT
;
1264 up_read(¤t
->mm
->mmap_sem
);
1269 __gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
, bool atomic
,
1270 bool *async
, bool write_fault
, bool *writable
)
1272 unsigned long addr
= __gfn_to_hva_many(slot
, gfn
, NULL
, write_fault
);
1274 if (addr
== KVM_HVA_ERR_RO_BAD
)
1275 return KVM_PFN_ERR_RO_FAULT
;
1277 if (kvm_is_error_hva(addr
))
1278 return KVM_PFN_NOSLOT
;
1280 /* Do not map writable pfn in the readonly memslot. */
1281 if (writable
&& memslot_is_readonly(slot
)) {
1286 return hva_to_pfn(addr
, atomic
, async
, write_fault
,
1290 static pfn_t
__gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
, bool atomic
, bool *async
,
1291 bool write_fault
, bool *writable
)
1293 struct kvm_memory_slot
*slot
;
1298 slot
= gfn_to_memslot(kvm
, gfn
);
1300 return __gfn_to_pfn_memslot(slot
, gfn
, atomic
, async
, write_fault
,
1304 pfn_t
gfn_to_pfn_atomic(struct kvm
*kvm
, gfn_t gfn
)
1306 return __gfn_to_pfn(kvm
, gfn
, true, NULL
, true, NULL
);
1308 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic
);
1310 pfn_t
gfn_to_pfn_async(struct kvm
*kvm
, gfn_t gfn
, bool *async
,
1311 bool write_fault
, bool *writable
)
1313 return __gfn_to_pfn(kvm
, gfn
, false, async
, write_fault
, writable
);
1315 EXPORT_SYMBOL_GPL(gfn_to_pfn_async
);
1317 pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
1319 return __gfn_to_pfn(kvm
, gfn
, false, NULL
, true, NULL
);
1321 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
1323 pfn_t
gfn_to_pfn_prot(struct kvm
*kvm
, gfn_t gfn
, bool write_fault
,
1326 return __gfn_to_pfn(kvm
, gfn
, false, NULL
, write_fault
, writable
);
1328 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot
);
1330 pfn_t
gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1332 return __gfn_to_pfn_memslot(slot
, gfn
, false, NULL
, true, NULL
);
1335 pfn_t
gfn_to_pfn_memslot_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1337 return __gfn_to_pfn_memslot(slot
, gfn
, true, NULL
, true, NULL
);
1339 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic
);
1341 int gfn_to_page_many_atomic(struct kvm
*kvm
, gfn_t gfn
, struct page
**pages
,
1347 addr
= gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, &entry
);
1348 if (kvm_is_error_hva(addr
))
1351 if (entry
< nr_pages
)
1354 return __get_user_pages_fast(addr
, nr_pages
, 1, pages
);
1356 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic
);
1358 static struct page
*kvm_pfn_to_page(pfn_t pfn
)
1360 if (is_error_noslot_pfn(pfn
))
1361 return KVM_ERR_PTR_BAD_PAGE
;
1363 if (kvm_is_mmio_pfn(pfn
)) {
1365 return KVM_ERR_PTR_BAD_PAGE
;
1368 return pfn_to_page(pfn
);
1371 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
1375 pfn
= gfn_to_pfn(kvm
, gfn
);
1377 return kvm_pfn_to_page(pfn
);
1380 EXPORT_SYMBOL_GPL(gfn_to_page
);
1382 void kvm_release_page_clean(struct page
*page
)
1384 WARN_ON(is_error_page(page
));
1386 kvm_release_pfn_clean(page_to_pfn(page
));
1388 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1390 void kvm_release_pfn_clean(pfn_t pfn
)
1392 if (!is_error_noslot_pfn(pfn
) && !kvm_is_mmio_pfn(pfn
))
1393 put_page(pfn_to_page(pfn
));
1395 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1397 void kvm_release_page_dirty(struct page
*page
)
1399 WARN_ON(is_error_page(page
));
1401 kvm_release_pfn_dirty(page_to_pfn(page
));
1403 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1405 void kvm_release_pfn_dirty(pfn_t pfn
)
1407 kvm_set_pfn_dirty(pfn
);
1408 kvm_release_pfn_clean(pfn
);
1410 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty
);
1412 void kvm_set_page_dirty(struct page
*page
)
1414 kvm_set_pfn_dirty(page_to_pfn(page
));
1416 EXPORT_SYMBOL_GPL(kvm_set_page_dirty
);
1418 void kvm_set_pfn_dirty(pfn_t pfn
)
1420 if (!kvm_is_mmio_pfn(pfn
)) {
1421 struct page
*page
= pfn_to_page(pfn
);
1422 if (!PageReserved(page
))
1426 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1428 void kvm_set_pfn_accessed(pfn_t pfn
)
1430 if (!kvm_is_mmio_pfn(pfn
))
1431 mark_page_accessed(pfn_to_page(pfn
));
1433 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1435 void kvm_get_pfn(pfn_t pfn
)
1437 if (!kvm_is_mmio_pfn(pfn
))
1438 get_page(pfn_to_page(pfn
));
1440 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1442 static int next_segment(unsigned long len
, int offset
)
1444 if (len
> PAGE_SIZE
- offset
)
1445 return PAGE_SIZE
- offset
;
1450 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1456 addr
= gfn_to_hva_read(kvm
, gfn
);
1457 if (kvm_is_error_hva(addr
))
1459 r
= kvm_read_hva(data
, (void __user
*)addr
+ offset
, len
);
1464 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1466 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1468 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1470 int offset
= offset_in_page(gpa
);
1473 while ((seg
= next_segment(len
, offset
)) != 0) {
1474 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
1484 EXPORT_SYMBOL_GPL(kvm_read_guest
);
1486 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
1491 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1492 int offset
= offset_in_page(gpa
);
1494 addr
= gfn_to_hva_read(kvm
, gfn
);
1495 if (kvm_is_error_hva(addr
))
1497 pagefault_disable();
1498 r
= kvm_read_hva_atomic(data
, (void __user
*)addr
+ offset
, len
);
1504 EXPORT_SYMBOL(kvm_read_guest_atomic
);
1506 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
, const void *data
,
1507 int offset
, int len
)
1512 addr
= gfn_to_hva(kvm
, gfn
);
1513 if (kvm_is_error_hva(addr
))
1515 r
= __copy_to_user((void __user
*)addr
+ offset
, data
, len
);
1518 mark_page_dirty(kvm
, gfn
);
1521 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
1523 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
1526 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1528 int offset
= offset_in_page(gpa
);
1531 while ((seg
= next_segment(len
, offset
)) != 0) {
1532 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
1543 int kvm_gfn_to_hva_cache_init(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1546 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1547 int offset
= offset_in_page(gpa
);
1548 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1551 ghc
->generation
= slots
->generation
;
1552 ghc
->memslot
= gfn_to_memslot(kvm
, gfn
);
1553 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, gfn
, NULL
);
1554 if (!kvm_is_error_hva(ghc
->hva
))
1561 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init
);
1563 int kvm_write_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1564 void *data
, unsigned long len
)
1566 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1569 if (slots
->generation
!= ghc
->generation
)
1570 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
);
1572 if (kvm_is_error_hva(ghc
->hva
))
1575 r
= __copy_to_user((void __user
*)ghc
->hva
, data
, len
);
1578 mark_page_dirty_in_slot(kvm
, ghc
->memslot
, ghc
->gpa
>> PAGE_SHIFT
);
1582 EXPORT_SYMBOL_GPL(kvm_write_guest_cached
);
1584 int kvm_read_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1585 void *data
, unsigned long len
)
1587 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1590 if (slots
->generation
!= ghc
->generation
)
1591 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
);
1593 if (kvm_is_error_hva(ghc
->hva
))
1596 r
= __copy_from_user(data
, (void __user
*)ghc
->hva
, len
);
1602 EXPORT_SYMBOL_GPL(kvm_read_guest_cached
);
1604 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
1606 return kvm_write_guest_page(kvm
, gfn
, (const void *) empty_zero_page
,
1609 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
1611 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
1613 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1615 int offset
= offset_in_page(gpa
);
1618 while ((seg
= next_segment(len
, offset
)) != 0) {
1619 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
1628 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
1630 void mark_page_dirty_in_slot(struct kvm
*kvm
, struct kvm_memory_slot
*memslot
,
1633 if (memslot
&& memslot
->dirty_bitmap
) {
1634 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
1636 set_bit_le(rel_gfn
, memslot
->dirty_bitmap
);
1640 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
1642 struct kvm_memory_slot
*memslot
;
1644 memslot
= gfn_to_memslot(kvm
, gfn
);
1645 mark_page_dirty_in_slot(kvm
, memslot
, gfn
);
1649 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1651 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
1656 prepare_to_wait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
1658 if (kvm_arch_vcpu_runnable(vcpu
)) {
1659 kvm_make_request(KVM_REQ_UNHALT
, vcpu
);
1662 if (kvm_cpu_has_pending_timer(vcpu
))
1664 if (signal_pending(current
))
1670 finish_wait(&vcpu
->wq
, &wait
);
1675 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
1677 void kvm_vcpu_kick(struct kvm_vcpu
*vcpu
)
1680 int cpu
= vcpu
->cpu
;
1681 wait_queue_head_t
*wqp
;
1683 wqp
= kvm_arch_vcpu_wq(vcpu
);
1684 if (waitqueue_active(wqp
)) {
1685 wake_up_interruptible(wqp
);
1686 ++vcpu
->stat
.halt_wakeup
;
1690 if (cpu
!= me
&& (unsigned)cpu
< nr_cpu_ids
&& cpu_online(cpu
))
1691 if (kvm_arch_vcpu_should_kick(vcpu
))
1692 smp_send_reschedule(cpu
);
1695 #endif /* !CONFIG_S390 */
1697 void kvm_resched(struct kvm_vcpu
*vcpu
)
1699 if (!need_resched())
1703 EXPORT_SYMBOL_GPL(kvm_resched
);
1705 bool kvm_vcpu_yield_to(struct kvm_vcpu
*target
)
1708 struct task_struct
*task
= NULL
;
1712 pid
= rcu_dereference(target
->pid
);
1714 task
= get_pid_task(target
->pid
, PIDTYPE_PID
);
1718 if (task
->flags
& PF_VCPU
) {
1719 put_task_struct(task
);
1722 ret
= yield_to(task
, 1);
1723 put_task_struct(task
);
1727 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to
);
1729 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
1731 * Helper that checks whether a VCPU is eligible for directed yield.
1732 * Most eligible candidate to yield is decided by following heuristics:
1734 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
1735 * (preempted lock holder), indicated by @in_spin_loop.
1736 * Set at the beiginning and cleared at the end of interception/PLE handler.
1738 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
1739 * chance last time (mostly it has become eligible now since we have probably
1740 * yielded to lockholder in last iteration. This is done by toggling
1741 * @dy_eligible each time a VCPU checked for eligibility.)
1743 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
1744 * to preempted lock-holder could result in wrong VCPU selection and CPU
1745 * burning. Giving priority for a potential lock-holder increases lock
1748 * Since algorithm is based on heuristics, accessing another VCPU data without
1749 * locking does not harm. It may result in trying to yield to same VCPU, fail
1750 * and continue with next VCPU and so on.
1752 bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu
*vcpu
)
1756 eligible
= !vcpu
->spin_loop
.in_spin_loop
||
1757 (vcpu
->spin_loop
.in_spin_loop
&&
1758 vcpu
->spin_loop
.dy_eligible
);
1760 if (vcpu
->spin_loop
.in_spin_loop
)
1761 kvm_vcpu_set_dy_eligible(vcpu
, !vcpu
->spin_loop
.dy_eligible
);
1767 void kvm_vcpu_on_spin(struct kvm_vcpu
*me
)
1769 struct kvm
*kvm
= me
->kvm
;
1770 struct kvm_vcpu
*vcpu
;
1771 int last_boosted_vcpu
= me
->kvm
->last_boosted_vcpu
;
1777 kvm_vcpu_set_in_spin_loop(me
, true);
1779 * We boost the priority of a VCPU that is runnable but not
1780 * currently running, because it got preempted by something
1781 * else and called schedule in __vcpu_run. Hopefully that
1782 * VCPU is holding the lock that we need and will release it.
1783 * We approximate round-robin by starting at the last boosted VCPU.
1785 for (pass
= 0; pass
< 2 && !yielded
&& try; pass
++) {
1786 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
1787 if (!pass
&& i
<= last_boosted_vcpu
) {
1788 i
= last_boosted_vcpu
;
1790 } else if (pass
&& i
> last_boosted_vcpu
)
1794 if (waitqueue_active(&vcpu
->wq
))
1796 if (!kvm_vcpu_eligible_for_directed_yield(vcpu
))
1799 yielded
= kvm_vcpu_yield_to(vcpu
);
1801 kvm
->last_boosted_vcpu
= i
;
1803 } else if (yielded
< 0) {
1810 kvm_vcpu_set_in_spin_loop(me
, false);
1812 /* Ensure vcpu is not eligible during next spinloop */
1813 kvm_vcpu_set_dy_eligible(me
, false);
1815 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin
);
1817 static int kvm_vcpu_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1819 struct kvm_vcpu
*vcpu
= vma
->vm_file
->private_data
;
1822 if (vmf
->pgoff
== 0)
1823 page
= virt_to_page(vcpu
->run
);
1825 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
1826 page
= virt_to_page(vcpu
->arch
.pio_data
);
1828 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1829 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
1830 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
1833 return kvm_arch_vcpu_fault(vcpu
, vmf
);
1839 static const struct vm_operations_struct kvm_vcpu_vm_ops
= {
1840 .fault
= kvm_vcpu_fault
,
1843 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1845 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
1849 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
1851 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1853 kvm_put_kvm(vcpu
->kvm
);
1857 static struct file_operations kvm_vcpu_fops
= {
1858 .release
= kvm_vcpu_release
,
1859 .unlocked_ioctl
= kvm_vcpu_ioctl
,
1860 #ifdef CONFIG_COMPAT
1861 .compat_ioctl
= kvm_vcpu_compat_ioctl
,
1863 .mmap
= kvm_vcpu_mmap
,
1864 .llseek
= noop_llseek
,
1868 * Allocates an inode for the vcpu.
1870 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
1872 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops
, vcpu
, O_RDWR
);
1876 * Creates some virtual cpus. Good luck creating more than one.
1878 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, u32 id
)
1881 struct kvm_vcpu
*vcpu
, *v
;
1883 vcpu
= kvm_arch_vcpu_create(kvm
, id
);
1885 return PTR_ERR(vcpu
);
1887 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
1889 r
= kvm_arch_vcpu_setup(vcpu
);
1893 mutex_lock(&kvm
->lock
);
1894 if (!kvm_vcpu_compatible(vcpu
)) {
1896 goto unlock_vcpu_destroy
;
1898 if (atomic_read(&kvm
->online_vcpus
) == KVM_MAX_VCPUS
) {
1900 goto unlock_vcpu_destroy
;
1903 kvm_for_each_vcpu(r
, v
, kvm
)
1904 if (v
->vcpu_id
== id
) {
1906 goto unlock_vcpu_destroy
;
1909 BUG_ON(kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)]);
1911 /* Now it's all set up, let userspace reach it */
1913 r
= create_vcpu_fd(vcpu
);
1916 goto unlock_vcpu_destroy
;
1919 kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)] = vcpu
;
1921 atomic_inc(&kvm
->online_vcpus
);
1923 mutex_unlock(&kvm
->lock
);
1924 kvm_arch_vcpu_postcreate(vcpu
);
1927 unlock_vcpu_destroy
:
1928 mutex_unlock(&kvm
->lock
);
1930 kvm_arch_vcpu_destroy(vcpu
);
1934 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
1937 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
1938 vcpu
->sigset_active
= 1;
1939 vcpu
->sigset
= *sigset
;
1941 vcpu
->sigset_active
= 0;
1945 static long kvm_vcpu_ioctl(struct file
*filp
,
1946 unsigned int ioctl
, unsigned long arg
)
1948 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1949 void __user
*argp
= (void __user
*)arg
;
1951 struct kvm_fpu
*fpu
= NULL
;
1952 struct kvm_sregs
*kvm_sregs
= NULL
;
1954 if (vcpu
->kvm
->mm
!= current
->mm
)
1957 #if defined(CONFIG_S390) || defined(CONFIG_PPC)
1959 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1960 * so vcpu_load() would break it.
1962 if (ioctl
== KVM_S390_INTERRUPT
|| ioctl
== KVM_INTERRUPT
)
1963 return kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
1967 r
= vcpu_load(vcpu
);
1975 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
1976 trace_kvm_userspace_exit(vcpu
->run
->exit_reason
, r
);
1978 case KVM_GET_REGS
: {
1979 struct kvm_regs
*kvm_regs
;
1982 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
1985 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
1989 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
1996 case KVM_SET_REGS
: {
1997 struct kvm_regs
*kvm_regs
;
2000 kvm_regs
= memdup_user(argp
, sizeof(*kvm_regs
));
2001 if (IS_ERR(kvm_regs
)) {
2002 r
= PTR_ERR(kvm_regs
);
2005 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
2009 case KVM_GET_SREGS
: {
2010 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
2014 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
2018 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
2023 case KVM_SET_SREGS
: {
2024 kvm_sregs
= memdup_user(argp
, sizeof(*kvm_sregs
));
2025 if (IS_ERR(kvm_sregs
)) {
2026 r
= PTR_ERR(kvm_sregs
);
2030 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
2033 case KVM_GET_MP_STATE
: {
2034 struct kvm_mp_state mp_state
;
2036 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
2040 if (copy_to_user(argp
, &mp_state
, sizeof mp_state
))
2045 case KVM_SET_MP_STATE
: {
2046 struct kvm_mp_state mp_state
;
2049 if (copy_from_user(&mp_state
, argp
, sizeof mp_state
))
2051 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
2054 case KVM_TRANSLATE
: {
2055 struct kvm_translation tr
;
2058 if (copy_from_user(&tr
, argp
, sizeof tr
))
2060 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
2064 if (copy_to_user(argp
, &tr
, sizeof tr
))
2069 case KVM_SET_GUEST_DEBUG
: {
2070 struct kvm_guest_debug dbg
;
2073 if (copy_from_user(&dbg
, argp
, sizeof dbg
))
2075 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
2078 case KVM_SET_SIGNAL_MASK
: {
2079 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2080 struct kvm_signal_mask kvm_sigmask
;
2081 sigset_t sigset
, *p
;
2086 if (copy_from_user(&kvm_sigmask
, argp
,
2087 sizeof kvm_sigmask
))
2090 if (kvm_sigmask
.len
!= sizeof sigset
)
2093 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
2098 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, p
);
2102 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
2106 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
2110 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
2116 fpu
= memdup_user(argp
, sizeof(*fpu
));
2122 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
2126 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2135 #ifdef CONFIG_COMPAT
2136 static long kvm_vcpu_compat_ioctl(struct file
*filp
,
2137 unsigned int ioctl
, unsigned long arg
)
2139 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2140 void __user
*argp
= compat_ptr(arg
);
2143 if (vcpu
->kvm
->mm
!= current
->mm
)
2147 case KVM_SET_SIGNAL_MASK
: {
2148 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2149 struct kvm_signal_mask kvm_sigmask
;
2150 compat_sigset_t csigset
;
2155 if (copy_from_user(&kvm_sigmask
, argp
,
2156 sizeof kvm_sigmask
))
2159 if (kvm_sigmask
.len
!= sizeof csigset
)
2162 if (copy_from_user(&csigset
, sigmask_arg
->sigset
,
2165 sigset_from_compat(&sigset
, &csigset
);
2166 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
2168 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, NULL
);
2172 r
= kvm_vcpu_ioctl(filp
, ioctl
, arg
);
2180 static long kvm_vm_ioctl(struct file
*filp
,
2181 unsigned int ioctl
, unsigned long arg
)
2183 struct kvm
*kvm
= filp
->private_data
;
2184 void __user
*argp
= (void __user
*)arg
;
2187 if (kvm
->mm
!= current
->mm
)
2190 case KVM_CREATE_VCPU
:
2191 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
2193 case KVM_SET_USER_MEMORY_REGION
: {
2194 struct kvm_userspace_memory_region kvm_userspace_mem
;
2197 if (copy_from_user(&kvm_userspace_mem
, argp
,
2198 sizeof kvm_userspace_mem
))
2201 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
, true);
2204 case KVM_GET_DIRTY_LOG
: {
2205 struct kvm_dirty_log log
;
2208 if (copy_from_user(&log
, argp
, sizeof log
))
2210 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2213 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2214 case KVM_REGISTER_COALESCED_MMIO
: {
2215 struct kvm_coalesced_mmio_zone zone
;
2217 if (copy_from_user(&zone
, argp
, sizeof zone
))
2219 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
2222 case KVM_UNREGISTER_COALESCED_MMIO
: {
2223 struct kvm_coalesced_mmio_zone zone
;
2225 if (copy_from_user(&zone
, argp
, sizeof zone
))
2227 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
2232 struct kvm_irqfd data
;
2235 if (copy_from_user(&data
, argp
, sizeof data
))
2237 r
= kvm_irqfd(kvm
, &data
);
2240 case KVM_IOEVENTFD
: {
2241 struct kvm_ioeventfd data
;
2244 if (copy_from_user(&data
, argp
, sizeof data
))
2246 r
= kvm_ioeventfd(kvm
, &data
);
2249 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2250 case KVM_SET_BOOT_CPU_ID
:
2252 mutex_lock(&kvm
->lock
);
2253 if (atomic_read(&kvm
->online_vcpus
) != 0)
2256 kvm
->bsp_vcpu_id
= arg
;
2257 mutex_unlock(&kvm
->lock
);
2260 #ifdef CONFIG_HAVE_KVM_MSI
2261 case KVM_SIGNAL_MSI
: {
2265 if (copy_from_user(&msi
, argp
, sizeof msi
))
2267 r
= kvm_send_userspace_msi(kvm
, &msi
);
2271 #ifdef __KVM_HAVE_IRQ_LINE
2272 case KVM_IRQ_LINE_STATUS
:
2273 case KVM_IRQ_LINE
: {
2274 struct kvm_irq_level irq_event
;
2277 if (copy_from_user(&irq_event
, argp
, sizeof irq_event
))
2280 r
= kvm_vm_ioctl_irq_line(kvm
, &irq_event
);
2285 if (ioctl
== KVM_IRQ_LINE_STATUS
) {
2286 if (copy_to_user(argp
, &irq_event
, sizeof irq_event
))
2295 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
2297 r
= kvm_vm_ioctl_assigned_device(kvm
, ioctl
, arg
);
2303 #ifdef CONFIG_COMPAT
2304 struct compat_kvm_dirty_log
{
2308 compat_uptr_t dirty_bitmap
; /* one bit per page */
2313 static long kvm_vm_compat_ioctl(struct file
*filp
,
2314 unsigned int ioctl
, unsigned long arg
)
2316 struct kvm
*kvm
= filp
->private_data
;
2319 if (kvm
->mm
!= current
->mm
)
2322 case KVM_GET_DIRTY_LOG
: {
2323 struct compat_kvm_dirty_log compat_log
;
2324 struct kvm_dirty_log log
;
2327 if (copy_from_user(&compat_log
, (void __user
*)arg
,
2328 sizeof(compat_log
)))
2330 log
.slot
= compat_log
.slot
;
2331 log
.padding1
= compat_log
.padding1
;
2332 log
.padding2
= compat_log
.padding2
;
2333 log
.dirty_bitmap
= compat_ptr(compat_log
.dirty_bitmap
);
2335 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2339 r
= kvm_vm_ioctl(filp
, ioctl
, arg
);
2347 static int kvm_vm_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
2349 struct page
*page
[1];
2352 gfn_t gfn
= vmf
->pgoff
;
2353 struct kvm
*kvm
= vma
->vm_file
->private_data
;
2355 addr
= gfn_to_hva(kvm
, gfn
);
2356 if (kvm_is_error_hva(addr
))
2357 return VM_FAULT_SIGBUS
;
2359 npages
= get_user_pages(current
, current
->mm
, addr
, 1, 1, 0, page
,
2361 if (unlikely(npages
!= 1))
2362 return VM_FAULT_SIGBUS
;
2364 vmf
->page
= page
[0];
2368 static const struct vm_operations_struct kvm_vm_vm_ops
= {
2369 .fault
= kvm_vm_fault
,
2372 static int kvm_vm_mmap(struct file
*file
, struct vm_area_struct
*vma
)
2374 vma
->vm_ops
= &kvm_vm_vm_ops
;
2378 static struct file_operations kvm_vm_fops
= {
2379 .release
= kvm_vm_release
,
2380 .unlocked_ioctl
= kvm_vm_ioctl
,
2381 #ifdef CONFIG_COMPAT
2382 .compat_ioctl
= kvm_vm_compat_ioctl
,
2384 .mmap
= kvm_vm_mmap
,
2385 .llseek
= noop_llseek
,
2388 static int kvm_dev_ioctl_create_vm(unsigned long type
)
2393 kvm
= kvm_create_vm(type
);
2395 return PTR_ERR(kvm
);
2396 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2397 r
= kvm_coalesced_mmio_init(kvm
);
2403 r
= anon_inode_getfd("kvm-vm", &kvm_vm_fops
, kvm
, O_RDWR
);
2410 static long kvm_dev_ioctl_check_extension_generic(long arg
)
2413 case KVM_CAP_USER_MEMORY
:
2414 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
2415 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
2416 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2417 case KVM_CAP_SET_BOOT_CPU_ID
:
2419 case KVM_CAP_INTERNAL_ERROR_DATA
:
2420 #ifdef CONFIG_HAVE_KVM_MSI
2421 case KVM_CAP_SIGNAL_MSI
:
2424 #ifdef KVM_CAP_IRQ_ROUTING
2425 case KVM_CAP_IRQ_ROUTING
:
2426 return KVM_MAX_IRQ_ROUTES
;
2431 return kvm_dev_ioctl_check_extension(arg
);
2434 static long kvm_dev_ioctl(struct file
*filp
,
2435 unsigned int ioctl
, unsigned long arg
)
2440 case KVM_GET_API_VERSION
:
2444 r
= KVM_API_VERSION
;
2447 r
= kvm_dev_ioctl_create_vm(arg
);
2449 case KVM_CHECK_EXTENSION
:
2450 r
= kvm_dev_ioctl_check_extension_generic(arg
);
2452 case KVM_GET_VCPU_MMAP_SIZE
:
2456 r
= PAGE_SIZE
; /* struct kvm_run */
2458 r
+= PAGE_SIZE
; /* pio data page */
2460 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2461 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
2464 case KVM_TRACE_ENABLE
:
2465 case KVM_TRACE_PAUSE
:
2466 case KVM_TRACE_DISABLE
:
2470 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
2476 static struct file_operations kvm_chardev_ops
= {
2477 .unlocked_ioctl
= kvm_dev_ioctl
,
2478 .compat_ioctl
= kvm_dev_ioctl
,
2479 .llseek
= noop_llseek
,
2482 static struct miscdevice kvm_dev
= {
2488 static void hardware_enable_nolock(void *junk
)
2490 int cpu
= raw_smp_processor_id();
2493 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2496 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
2498 r
= kvm_arch_hardware_enable(NULL
);
2501 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2502 atomic_inc(&hardware_enable_failed
);
2503 printk(KERN_INFO
"kvm: enabling virtualization on "
2504 "CPU%d failed\n", cpu
);
2508 static void hardware_enable(void *junk
)
2510 raw_spin_lock(&kvm_lock
);
2511 hardware_enable_nolock(junk
);
2512 raw_spin_unlock(&kvm_lock
);
2515 static void hardware_disable_nolock(void *junk
)
2517 int cpu
= raw_smp_processor_id();
2519 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2521 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2522 kvm_arch_hardware_disable(NULL
);
2525 static void hardware_disable(void *junk
)
2527 raw_spin_lock(&kvm_lock
);
2528 hardware_disable_nolock(junk
);
2529 raw_spin_unlock(&kvm_lock
);
2532 static void hardware_disable_all_nolock(void)
2534 BUG_ON(!kvm_usage_count
);
2537 if (!kvm_usage_count
)
2538 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2541 static void hardware_disable_all(void)
2543 raw_spin_lock(&kvm_lock
);
2544 hardware_disable_all_nolock();
2545 raw_spin_unlock(&kvm_lock
);
2548 static int hardware_enable_all(void)
2552 raw_spin_lock(&kvm_lock
);
2555 if (kvm_usage_count
== 1) {
2556 atomic_set(&hardware_enable_failed
, 0);
2557 on_each_cpu(hardware_enable_nolock
, NULL
, 1);
2559 if (atomic_read(&hardware_enable_failed
)) {
2560 hardware_disable_all_nolock();
2565 raw_spin_unlock(&kvm_lock
);
2570 static int kvm_cpu_hotplug(struct notifier_block
*notifier
, unsigned long val
,
2575 if (!kvm_usage_count
)
2578 val
&= ~CPU_TASKS_FROZEN
;
2581 printk(KERN_INFO
"kvm: disabling virtualization on CPU%d\n",
2583 hardware_disable(NULL
);
2586 printk(KERN_INFO
"kvm: enabling virtualization on CPU%d\n",
2588 hardware_enable(NULL
);
2595 asmlinkage
void kvm_spurious_fault(void)
2597 /* Fault while not rebooting. We want the trace. */
2600 EXPORT_SYMBOL_GPL(kvm_spurious_fault
);
2602 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
2606 * Some (well, at least mine) BIOSes hang on reboot if
2609 * And Intel TXT required VMX off for all cpu when system shutdown.
2611 printk(KERN_INFO
"kvm: exiting hardware virtualization\n");
2612 kvm_rebooting
= true;
2613 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2617 static struct notifier_block kvm_reboot_notifier
= {
2618 .notifier_call
= kvm_reboot
,
2622 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
2626 for (i
= 0; i
< bus
->dev_count
; i
++) {
2627 struct kvm_io_device
*pos
= bus
->range
[i
].dev
;
2629 kvm_iodevice_destructor(pos
);
2634 int kvm_io_bus_sort_cmp(const void *p1
, const void *p2
)
2636 const struct kvm_io_range
*r1
= p1
;
2637 const struct kvm_io_range
*r2
= p2
;
2639 if (r1
->addr
< r2
->addr
)
2641 if (r1
->addr
+ r1
->len
> r2
->addr
+ r2
->len
)
2646 int kvm_io_bus_insert_dev(struct kvm_io_bus
*bus
, struct kvm_io_device
*dev
,
2647 gpa_t addr
, int len
)
2649 bus
->range
[bus
->dev_count
++] = (struct kvm_io_range
) {
2655 sort(bus
->range
, bus
->dev_count
, sizeof(struct kvm_io_range
),
2656 kvm_io_bus_sort_cmp
, NULL
);
2661 int kvm_io_bus_get_first_dev(struct kvm_io_bus
*bus
,
2662 gpa_t addr
, int len
)
2664 struct kvm_io_range
*range
, key
;
2667 key
= (struct kvm_io_range
) {
2672 range
= bsearch(&key
, bus
->range
, bus
->dev_count
,
2673 sizeof(struct kvm_io_range
), kvm_io_bus_sort_cmp
);
2677 off
= range
- bus
->range
;
2679 while (off
> 0 && kvm_io_bus_sort_cmp(&key
, &bus
->range
[off
-1]) == 0)
2685 /* kvm_io_bus_write - called under kvm->slots_lock */
2686 int kvm_io_bus_write(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2687 int len
, const void *val
)
2690 struct kvm_io_bus
*bus
;
2691 struct kvm_io_range range
;
2693 range
= (struct kvm_io_range
) {
2698 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2699 idx
= kvm_io_bus_get_first_dev(bus
, addr
, len
);
2703 while (idx
< bus
->dev_count
&&
2704 kvm_io_bus_sort_cmp(&range
, &bus
->range
[idx
]) == 0) {
2705 if (!kvm_iodevice_write(bus
->range
[idx
].dev
, addr
, len
, val
))
2713 /* kvm_io_bus_read - called under kvm->slots_lock */
2714 int kvm_io_bus_read(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2718 struct kvm_io_bus
*bus
;
2719 struct kvm_io_range range
;
2721 range
= (struct kvm_io_range
) {
2726 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2727 idx
= kvm_io_bus_get_first_dev(bus
, addr
, len
);
2731 while (idx
< bus
->dev_count
&&
2732 kvm_io_bus_sort_cmp(&range
, &bus
->range
[idx
]) == 0) {
2733 if (!kvm_iodevice_read(bus
->range
[idx
].dev
, addr
, len
, val
))
2741 /* Caller must hold slots_lock. */
2742 int kvm_io_bus_register_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2743 int len
, struct kvm_io_device
*dev
)
2745 struct kvm_io_bus
*new_bus
, *bus
;
2747 bus
= kvm
->buses
[bus_idx
];
2748 if (bus
->dev_count
> NR_IOBUS_DEVS
- 1)
2751 new_bus
= kzalloc(sizeof(*bus
) + ((bus
->dev_count
+ 1) *
2752 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
2755 memcpy(new_bus
, bus
, sizeof(*bus
) + (bus
->dev_count
*
2756 sizeof(struct kvm_io_range
)));
2757 kvm_io_bus_insert_dev(new_bus
, dev
, addr
, len
);
2758 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
2759 synchronize_srcu_expedited(&kvm
->srcu
);
2765 /* Caller must hold slots_lock. */
2766 int kvm_io_bus_unregister_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
2767 struct kvm_io_device
*dev
)
2770 struct kvm_io_bus
*new_bus
, *bus
;
2772 bus
= kvm
->buses
[bus_idx
];
2774 for (i
= 0; i
< bus
->dev_count
; i
++)
2775 if (bus
->range
[i
].dev
== dev
) {
2783 new_bus
= kzalloc(sizeof(*bus
) + ((bus
->dev_count
- 1) *
2784 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
2788 memcpy(new_bus
, bus
, sizeof(*bus
) + i
* sizeof(struct kvm_io_range
));
2789 new_bus
->dev_count
--;
2790 memcpy(new_bus
->range
+ i
, bus
->range
+ i
+ 1,
2791 (new_bus
->dev_count
- i
) * sizeof(struct kvm_io_range
));
2793 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
2794 synchronize_srcu_expedited(&kvm
->srcu
);
2799 static struct notifier_block kvm_cpu_notifier
= {
2800 .notifier_call
= kvm_cpu_hotplug
,
2803 static int vm_stat_get(void *_offset
, u64
*val
)
2805 unsigned offset
= (long)_offset
;
2809 raw_spin_lock(&kvm_lock
);
2810 list_for_each_entry(kvm
, &vm_list
, vm_list
)
2811 *val
+= *(u32
*)((void *)kvm
+ offset
);
2812 raw_spin_unlock(&kvm_lock
);
2816 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, NULL
, "%llu\n");
2818 static int vcpu_stat_get(void *_offset
, u64
*val
)
2820 unsigned offset
= (long)_offset
;
2822 struct kvm_vcpu
*vcpu
;
2826 raw_spin_lock(&kvm_lock
);
2827 list_for_each_entry(kvm
, &vm_list
, vm_list
)
2828 kvm_for_each_vcpu(i
, vcpu
, kvm
)
2829 *val
+= *(u32
*)((void *)vcpu
+ offset
);
2831 raw_spin_unlock(&kvm_lock
);
2835 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, NULL
, "%llu\n");
2837 static const struct file_operations
*stat_fops
[] = {
2838 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
2839 [KVM_STAT_VM
] = &vm_stat_fops
,
2842 static int kvm_init_debug(void)
2845 struct kvm_stats_debugfs_item
*p
;
2847 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
2848 if (kvm_debugfs_dir
== NULL
)
2851 for (p
= debugfs_entries
; p
->name
; ++p
) {
2852 p
->dentry
= debugfs_create_file(p
->name
, 0444, kvm_debugfs_dir
,
2853 (void *)(long)p
->offset
,
2854 stat_fops
[p
->kind
]);
2855 if (p
->dentry
== NULL
)
2862 debugfs_remove_recursive(kvm_debugfs_dir
);
2867 static void kvm_exit_debug(void)
2869 struct kvm_stats_debugfs_item
*p
;
2871 for (p
= debugfs_entries
; p
->name
; ++p
)
2872 debugfs_remove(p
->dentry
);
2873 debugfs_remove(kvm_debugfs_dir
);
2876 static int kvm_suspend(void)
2878 if (kvm_usage_count
)
2879 hardware_disable_nolock(NULL
);
2883 static void kvm_resume(void)
2885 if (kvm_usage_count
) {
2886 WARN_ON(raw_spin_is_locked(&kvm_lock
));
2887 hardware_enable_nolock(NULL
);
2891 static struct syscore_ops kvm_syscore_ops
= {
2892 .suspend
= kvm_suspend
,
2893 .resume
= kvm_resume
,
2897 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
2899 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
2902 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
2904 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
2906 kvm_arch_vcpu_load(vcpu
, cpu
);
2909 static void kvm_sched_out(struct preempt_notifier
*pn
,
2910 struct task_struct
*next
)
2912 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
2914 kvm_arch_vcpu_put(vcpu
);
2917 int kvm_init(void *opaque
, unsigned vcpu_size
, unsigned vcpu_align
,
2918 struct module
*module
)
2923 r
= kvm_arch_init(opaque
);
2927 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
2932 r
= kvm_arch_hardware_setup();
2936 for_each_online_cpu(cpu
) {
2937 smp_call_function_single(cpu
,
2938 kvm_arch_check_processor_compat
,
2944 r
= register_cpu_notifier(&kvm_cpu_notifier
);
2947 register_reboot_notifier(&kvm_reboot_notifier
);
2949 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2951 vcpu_align
= __alignof__(struct kvm_vcpu
);
2952 kvm_vcpu_cache
= kmem_cache_create("kvm_vcpu", vcpu_size
, vcpu_align
,
2954 if (!kvm_vcpu_cache
) {
2959 r
= kvm_async_pf_init();
2963 kvm_chardev_ops
.owner
= module
;
2964 kvm_vm_fops
.owner
= module
;
2965 kvm_vcpu_fops
.owner
= module
;
2967 r
= misc_register(&kvm_dev
);
2969 printk(KERN_ERR
"kvm: misc device register failed\n");
2973 register_syscore_ops(&kvm_syscore_ops
);
2975 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
2976 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
2978 r
= kvm_init_debug();
2980 printk(KERN_ERR
"kvm: create debugfs files failed\n");
2987 unregister_syscore_ops(&kvm_syscore_ops
);
2989 kvm_async_pf_deinit();
2991 kmem_cache_destroy(kvm_vcpu_cache
);
2993 unregister_reboot_notifier(&kvm_reboot_notifier
);
2994 unregister_cpu_notifier(&kvm_cpu_notifier
);
2997 kvm_arch_hardware_unsetup();
2999 free_cpumask_var(cpus_hardware_enabled
);
3005 EXPORT_SYMBOL_GPL(kvm_init
);
3010 misc_deregister(&kvm_dev
);
3011 kmem_cache_destroy(kvm_vcpu_cache
);
3012 kvm_async_pf_deinit();
3013 unregister_syscore_ops(&kvm_syscore_ops
);
3014 unregister_reboot_notifier(&kvm_reboot_notifier
);
3015 unregister_cpu_notifier(&kvm_cpu_notifier
);
3016 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3017 kvm_arch_hardware_unsetup();
3019 free_cpumask_var(cpus_hardware_enabled
);
3021 EXPORT_SYMBOL_GPL(kvm_exit
);