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 bool old_iommu_mapped
;
758 enum kvm_mr_change change
;
760 r
= check_memory_region_flags(mem
);
765 /* General sanity checks */
766 if (mem
->memory_size
& (PAGE_SIZE
- 1))
768 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
770 /* We can read the guest memory with __xxx_user() later on. */
772 ((mem
->userspace_addr
& (PAGE_SIZE
- 1)) ||
773 !access_ok(VERIFY_WRITE
,
774 (void __user
*)(unsigned long)mem
->userspace_addr
,
777 if (mem
->slot
>= KVM_MEM_SLOTS_NUM
)
779 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
782 slot
= id_to_memslot(kvm
->memslots
, mem
->slot
);
783 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
784 npages
= mem
->memory_size
>> PAGE_SHIFT
;
787 if (npages
> KVM_MEM_MAX_NR_PAGES
)
791 mem
->flags
&= ~KVM_MEM_LOG_DIRTY_PAGES
;
796 new.base_gfn
= base_gfn
;
798 new.flags
= mem
->flags
;
800 old_iommu_mapped
= old
.npages
;
805 change
= KVM_MR_CREATE
;
806 else { /* Modify an existing slot. */
807 if ((mem
->userspace_addr
!= old
.userspace_addr
) ||
808 (npages
!= old
.npages
))
811 if (base_gfn
!= old
.base_gfn
)
812 change
= KVM_MR_MOVE
;
813 else if (new.flags
!= old
.flags
)
814 change
= KVM_MR_FLAGS_ONLY
;
815 else { /* Nothing to change. */
820 } else if (old
.npages
) {
821 change
= KVM_MR_DELETE
;
822 } else /* Modify a non-existent slot: disallowed. */
825 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
826 /* Check for overlaps */
828 kvm_for_each_memslot(slot
, kvm
->memslots
) {
829 if ((slot
->id
>= KVM_USER_MEM_SLOTS
) ||
830 (slot
->id
== mem
->slot
))
832 if (!((base_gfn
+ npages
<= slot
->base_gfn
) ||
833 (base_gfn
>= slot
->base_gfn
+ slot
->npages
)))
838 /* Free page dirty bitmap if unneeded */
839 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
840 new.dirty_bitmap
= NULL
;
843 if (change
== KVM_MR_CREATE
) {
844 new.user_alloc
= user_alloc
;
845 new.userspace_addr
= mem
->userspace_addr
;
847 if (kvm_arch_create_memslot(&new, npages
))
851 /* Allocate page dirty bitmap if needed */
852 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
853 if (kvm_create_dirty_bitmap(&new) < 0)
857 if ((change
== KVM_MR_DELETE
) || (change
== KVM_MR_MOVE
)) {
859 slots
= kmemdup(kvm
->memslots
, sizeof(struct kvm_memslots
),
863 slot
= id_to_memslot(slots
, mem
->slot
);
864 slot
->flags
|= KVM_MEMSLOT_INVALID
;
866 old_memslots
= install_new_memslots(kvm
, slots
, NULL
);
868 /* slot was deleted or moved, clear iommu mapping */
869 kvm_iommu_unmap_pages(kvm
, &old
);
870 old_iommu_mapped
= false;
871 /* From this point no new shadow pages pointing to a deleted,
872 * or moved, memslot will be created.
874 * validation of sp->gfn happens in:
875 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
876 * - kvm_is_visible_gfn (mmu_check_roots)
878 kvm_arch_flush_shadow_memslot(kvm
, slot
);
879 slots
= old_memslots
;
882 r
= kvm_arch_prepare_memory_region(kvm
, &new, old
, mem
, user_alloc
);
888 * We can re-use the old_memslots from above, the only difference
889 * from the currently installed memslots is the invalid flag. This
890 * will get overwritten by update_memslots anyway.
893 slots
= kmemdup(kvm
->memslots
, sizeof(struct kvm_memslots
),
900 * IOMMU mapping: New slots need to be mapped. Old slots need to be
901 * un-mapped and re-mapped if their base changes or if flags that the
902 * iommu cares about change (read-only). Base change unmapping is
903 * handled above with slot deletion, so we only unmap incompatible
904 * flags here. Anything else the iommu might care about for existing
905 * slots (size changes, userspace addr changes) is disallowed above,
906 * so any other attribute changes getting here can be skipped.
908 if (change
!= KVM_MR_DELETE
) {
909 if (old_iommu_mapped
&&
910 ((new.flags
^ old
.flags
) & KVM_MEM_READONLY
)) {
911 kvm_iommu_unmap_pages(kvm
, &old
);
912 old_iommu_mapped
= false;
915 if (!old_iommu_mapped
) {
916 r
= kvm_iommu_map_pages(kvm
, &new);
922 /* actual memory is freed via old in kvm_free_physmem_slot below */
923 if (change
== KVM_MR_DELETE
) {
924 new.dirty_bitmap
= NULL
;
925 memset(&new.arch
, 0, sizeof(new.arch
));
928 old_memslots
= install_new_memslots(kvm
, slots
, &new);
930 kvm_arch_commit_memory_region(kvm
, mem
, old
, user_alloc
);
932 kvm_free_physmem_slot(&old
, &new);
940 kvm_free_physmem_slot(&new, &old
);
944 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
946 int kvm_set_memory_region(struct kvm
*kvm
,
947 struct kvm_userspace_memory_region
*mem
,
952 mutex_lock(&kvm
->slots_lock
);
953 r
= __kvm_set_memory_region(kvm
, mem
, user_alloc
);
954 mutex_unlock(&kvm
->slots_lock
);
957 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
959 int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
961 kvm_userspace_memory_region
*mem
,
964 if (mem
->slot
>= KVM_USER_MEM_SLOTS
)
966 return kvm_set_memory_region(kvm
, mem
, user_alloc
);
969 int kvm_get_dirty_log(struct kvm
*kvm
,
970 struct kvm_dirty_log
*log
, int *is_dirty
)
972 struct kvm_memory_slot
*memslot
;
975 unsigned long any
= 0;
978 if (log
->slot
>= KVM_USER_MEM_SLOTS
)
981 memslot
= id_to_memslot(kvm
->memslots
, log
->slot
);
983 if (!memslot
->dirty_bitmap
)
986 n
= kvm_dirty_bitmap_bytes(memslot
);
988 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
989 any
= memslot
->dirty_bitmap
[i
];
992 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
1003 bool kvm_largepages_enabled(void)
1005 return largepages_enabled
;
1008 void kvm_disable_largepages(void)
1010 largepages_enabled
= false;
1012 EXPORT_SYMBOL_GPL(kvm_disable_largepages
);
1014 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
1016 return __gfn_to_memslot(kvm_memslots(kvm
), gfn
);
1018 EXPORT_SYMBOL_GPL(gfn_to_memslot
);
1020 int kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
1022 struct kvm_memory_slot
*memslot
= gfn_to_memslot(kvm
, gfn
);
1024 if (!memslot
|| memslot
->id
>= KVM_USER_MEM_SLOTS
||
1025 memslot
->flags
& KVM_MEMSLOT_INVALID
)
1030 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
1032 unsigned long kvm_host_page_size(struct kvm
*kvm
, gfn_t gfn
)
1034 struct vm_area_struct
*vma
;
1035 unsigned long addr
, size
;
1039 addr
= gfn_to_hva(kvm
, gfn
);
1040 if (kvm_is_error_hva(addr
))
1043 down_read(¤t
->mm
->mmap_sem
);
1044 vma
= find_vma(current
->mm
, addr
);
1048 size
= vma_kernel_pagesize(vma
);
1051 up_read(¤t
->mm
->mmap_sem
);
1056 static bool memslot_is_readonly(struct kvm_memory_slot
*slot
)
1058 return slot
->flags
& KVM_MEM_READONLY
;
1061 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1062 gfn_t
*nr_pages
, bool write
)
1064 if (!slot
|| slot
->flags
& KVM_MEMSLOT_INVALID
)
1065 return KVM_HVA_ERR_BAD
;
1067 if (memslot_is_readonly(slot
) && write
)
1068 return KVM_HVA_ERR_RO_BAD
;
1071 *nr_pages
= slot
->npages
- (gfn
- slot
->base_gfn
);
1073 return __gfn_to_hva_memslot(slot
, gfn
);
1076 static unsigned long gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1079 return __gfn_to_hva_many(slot
, gfn
, nr_pages
, true);
1082 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot
*slot
,
1085 return gfn_to_hva_many(slot
, gfn
, NULL
);
1087 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot
);
1089 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
1091 return gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, NULL
);
1093 EXPORT_SYMBOL_GPL(gfn_to_hva
);
1096 * The hva returned by this function is only allowed to be read.
1097 * It should pair with kvm_read_hva() or kvm_read_hva_atomic().
1099 static unsigned long gfn_to_hva_read(struct kvm
*kvm
, gfn_t gfn
)
1101 return __gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, NULL
, false);
1104 static int kvm_read_hva(void *data
, void __user
*hva
, int len
)
1106 return __copy_from_user(data
, hva
, len
);
1109 static int kvm_read_hva_atomic(void *data
, void __user
*hva
, int len
)
1111 return __copy_from_user_inatomic(data
, hva
, len
);
1114 int get_user_page_nowait(struct task_struct
*tsk
, struct mm_struct
*mm
,
1115 unsigned long start
, int write
, struct page
**page
)
1117 int flags
= FOLL_TOUCH
| FOLL_NOWAIT
| FOLL_HWPOISON
| FOLL_GET
;
1120 flags
|= FOLL_WRITE
;
1122 return __get_user_pages(tsk
, mm
, start
, 1, flags
, page
, NULL
, NULL
);
1125 static inline int check_user_page_hwpoison(unsigned long addr
)
1127 int rc
, flags
= FOLL_TOUCH
| FOLL_HWPOISON
| FOLL_WRITE
;
1129 rc
= __get_user_pages(current
, current
->mm
, addr
, 1,
1130 flags
, NULL
, NULL
, NULL
);
1131 return rc
== -EHWPOISON
;
1135 * The atomic path to get the writable pfn which will be stored in @pfn,
1136 * true indicates success, otherwise false is returned.
1138 static bool hva_to_pfn_fast(unsigned long addr
, bool atomic
, bool *async
,
1139 bool write_fault
, bool *writable
, pfn_t
*pfn
)
1141 struct page
*page
[1];
1144 if (!(async
|| atomic
))
1148 * Fast pin a writable pfn only if it is a write fault request
1149 * or the caller allows to map a writable pfn for a read fault
1152 if (!(write_fault
|| writable
))
1155 npages
= __get_user_pages_fast(addr
, 1, 1, page
);
1157 *pfn
= page_to_pfn(page
[0]);
1168 * The slow path to get the pfn of the specified host virtual address,
1169 * 1 indicates success, -errno is returned if error is detected.
1171 static int hva_to_pfn_slow(unsigned long addr
, bool *async
, bool write_fault
,
1172 bool *writable
, pfn_t
*pfn
)
1174 struct page
*page
[1];
1180 *writable
= write_fault
;
1183 down_read(¤t
->mm
->mmap_sem
);
1184 npages
= get_user_page_nowait(current
, current
->mm
,
1185 addr
, write_fault
, page
);
1186 up_read(¤t
->mm
->mmap_sem
);
1188 npages
= get_user_pages_fast(addr
, 1, write_fault
,
1193 /* map read fault as writable if possible */
1194 if (unlikely(!write_fault
) && writable
) {
1195 struct page
*wpage
[1];
1197 npages
= __get_user_pages_fast(addr
, 1, 1, wpage
);
1206 *pfn
= page_to_pfn(page
[0]);
1210 static bool vma_is_valid(struct vm_area_struct
*vma
, bool write_fault
)
1212 if (unlikely(!(vma
->vm_flags
& VM_READ
)))
1215 if (write_fault
&& (unlikely(!(vma
->vm_flags
& VM_WRITE
))))
1222 * Pin guest page in memory and return its pfn.
1223 * @addr: host virtual address which maps memory to the guest
1224 * @atomic: whether this function can sleep
1225 * @async: whether this function need to wait IO complete if the
1226 * host page is not in the memory
1227 * @write_fault: whether we should get a writable host page
1228 * @writable: whether it allows to map a writable host page for !@write_fault
1230 * The function will map a writable host page for these two cases:
1231 * 1): @write_fault = true
1232 * 2): @write_fault = false && @writable, @writable will tell the caller
1233 * whether the mapping is writable.
1235 static pfn_t
hva_to_pfn(unsigned long addr
, bool atomic
, bool *async
,
1236 bool write_fault
, bool *writable
)
1238 struct vm_area_struct
*vma
;
1242 /* we can do it either atomically or asynchronously, not both */
1243 BUG_ON(atomic
&& async
);
1245 if (hva_to_pfn_fast(addr
, atomic
, async
, write_fault
, writable
, &pfn
))
1249 return KVM_PFN_ERR_FAULT
;
1251 npages
= hva_to_pfn_slow(addr
, async
, write_fault
, writable
, &pfn
);
1255 down_read(¤t
->mm
->mmap_sem
);
1256 if (npages
== -EHWPOISON
||
1257 (!async
&& check_user_page_hwpoison(addr
))) {
1258 pfn
= KVM_PFN_ERR_HWPOISON
;
1262 vma
= find_vma_intersection(current
->mm
, addr
, addr
+ 1);
1265 pfn
= KVM_PFN_ERR_FAULT
;
1266 else if ((vma
->vm_flags
& VM_PFNMAP
)) {
1267 pfn
= ((addr
- vma
->vm_start
) >> PAGE_SHIFT
) +
1269 BUG_ON(!kvm_is_mmio_pfn(pfn
));
1271 if (async
&& vma_is_valid(vma
, write_fault
))
1273 pfn
= KVM_PFN_ERR_FAULT
;
1276 up_read(¤t
->mm
->mmap_sem
);
1281 __gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
, bool atomic
,
1282 bool *async
, bool write_fault
, bool *writable
)
1284 unsigned long addr
= __gfn_to_hva_many(slot
, gfn
, NULL
, write_fault
);
1286 if (addr
== KVM_HVA_ERR_RO_BAD
)
1287 return KVM_PFN_ERR_RO_FAULT
;
1289 if (kvm_is_error_hva(addr
))
1290 return KVM_PFN_NOSLOT
;
1292 /* Do not map writable pfn in the readonly memslot. */
1293 if (writable
&& memslot_is_readonly(slot
)) {
1298 return hva_to_pfn(addr
, atomic
, async
, write_fault
,
1302 static pfn_t
__gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
, bool atomic
, bool *async
,
1303 bool write_fault
, bool *writable
)
1305 struct kvm_memory_slot
*slot
;
1310 slot
= gfn_to_memslot(kvm
, gfn
);
1312 return __gfn_to_pfn_memslot(slot
, gfn
, atomic
, async
, write_fault
,
1316 pfn_t
gfn_to_pfn_atomic(struct kvm
*kvm
, gfn_t gfn
)
1318 return __gfn_to_pfn(kvm
, gfn
, true, NULL
, true, NULL
);
1320 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic
);
1322 pfn_t
gfn_to_pfn_async(struct kvm
*kvm
, gfn_t gfn
, bool *async
,
1323 bool write_fault
, bool *writable
)
1325 return __gfn_to_pfn(kvm
, gfn
, false, async
, write_fault
, writable
);
1327 EXPORT_SYMBOL_GPL(gfn_to_pfn_async
);
1329 pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
1331 return __gfn_to_pfn(kvm
, gfn
, false, NULL
, true, NULL
);
1333 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
1335 pfn_t
gfn_to_pfn_prot(struct kvm
*kvm
, gfn_t gfn
, bool write_fault
,
1338 return __gfn_to_pfn(kvm
, gfn
, false, NULL
, write_fault
, writable
);
1340 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot
);
1342 pfn_t
gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1344 return __gfn_to_pfn_memslot(slot
, gfn
, false, NULL
, true, NULL
);
1347 pfn_t
gfn_to_pfn_memslot_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1349 return __gfn_to_pfn_memslot(slot
, gfn
, true, NULL
, true, NULL
);
1351 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic
);
1353 int gfn_to_page_many_atomic(struct kvm
*kvm
, gfn_t gfn
, struct page
**pages
,
1359 addr
= gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, &entry
);
1360 if (kvm_is_error_hva(addr
))
1363 if (entry
< nr_pages
)
1366 return __get_user_pages_fast(addr
, nr_pages
, 1, pages
);
1368 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic
);
1370 static struct page
*kvm_pfn_to_page(pfn_t pfn
)
1372 if (is_error_noslot_pfn(pfn
))
1373 return KVM_ERR_PTR_BAD_PAGE
;
1375 if (kvm_is_mmio_pfn(pfn
)) {
1377 return KVM_ERR_PTR_BAD_PAGE
;
1380 return pfn_to_page(pfn
);
1383 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
1387 pfn
= gfn_to_pfn(kvm
, gfn
);
1389 return kvm_pfn_to_page(pfn
);
1392 EXPORT_SYMBOL_GPL(gfn_to_page
);
1394 void kvm_release_page_clean(struct page
*page
)
1396 WARN_ON(is_error_page(page
));
1398 kvm_release_pfn_clean(page_to_pfn(page
));
1400 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1402 void kvm_release_pfn_clean(pfn_t pfn
)
1404 if (!is_error_noslot_pfn(pfn
) && !kvm_is_mmio_pfn(pfn
))
1405 put_page(pfn_to_page(pfn
));
1407 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1409 void kvm_release_page_dirty(struct page
*page
)
1411 WARN_ON(is_error_page(page
));
1413 kvm_release_pfn_dirty(page_to_pfn(page
));
1415 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1417 void kvm_release_pfn_dirty(pfn_t pfn
)
1419 kvm_set_pfn_dirty(pfn
);
1420 kvm_release_pfn_clean(pfn
);
1422 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty
);
1424 void kvm_set_page_dirty(struct page
*page
)
1426 kvm_set_pfn_dirty(page_to_pfn(page
));
1428 EXPORT_SYMBOL_GPL(kvm_set_page_dirty
);
1430 void kvm_set_pfn_dirty(pfn_t pfn
)
1432 if (!kvm_is_mmio_pfn(pfn
)) {
1433 struct page
*page
= pfn_to_page(pfn
);
1434 if (!PageReserved(page
))
1438 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1440 void kvm_set_pfn_accessed(pfn_t pfn
)
1442 if (!kvm_is_mmio_pfn(pfn
))
1443 mark_page_accessed(pfn_to_page(pfn
));
1445 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1447 void kvm_get_pfn(pfn_t pfn
)
1449 if (!kvm_is_mmio_pfn(pfn
))
1450 get_page(pfn_to_page(pfn
));
1452 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1454 static int next_segment(unsigned long len
, int offset
)
1456 if (len
> PAGE_SIZE
- offset
)
1457 return PAGE_SIZE
- offset
;
1462 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1468 addr
= gfn_to_hva_read(kvm
, gfn
);
1469 if (kvm_is_error_hva(addr
))
1471 r
= kvm_read_hva(data
, (void __user
*)addr
+ offset
, len
);
1476 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1478 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1480 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1482 int offset
= offset_in_page(gpa
);
1485 while ((seg
= next_segment(len
, offset
)) != 0) {
1486 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
1496 EXPORT_SYMBOL_GPL(kvm_read_guest
);
1498 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
1503 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1504 int offset
= offset_in_page(gpa
);
1506 addr
= gfn_to_hva_read(kvm
, gfn
);
1507 if (kvm_is_error_hva(addr
))
1509 pagefault_disable();
1510 r
= kvm_read_hva_atomic(data
, (void __user
*)addr
+ offset
, len
);
1516 EXPORT_SYMBOL(kvm_read_guest_atomic
);
1518 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
, const void *data
,
1519 int offset
, int len
)
1524 addr
= gfn_to_hva(kvm
, gfn
);
1525 if (kvm_is_error_hva(addr
))
1527 r
= __copy_to_user((void __user
*)addr
+ offset
, data
, len
);
1530 mark_page_dirty(kvm
, gfn
);
1533 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
1535 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
1538 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1540 int offset
= offset_in_page(gpa
);
1543 while ((seg
= next_segment(len
, offset
)) != 0) {
1544 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
1555 int kvm_gfn_to_hva_cache_init(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1558 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1559 int offset
= offset_in_page(gpa
);
1560 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1563 ghc
->generation
= slots
->generation
;
1564 ghc
->memslot
= gfn_to_memslot(kvm
, gfn
);
1565 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, gfn
, NULL
);
1566 if (!kvm_is_error_hva(ghc
->hva
))
1573 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init
);
1575 int kvm_write_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1576 void *data
, unsigned long len
)
1578 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1581 if (slots
->generation
!= ghc
->generation
)
1582 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
);
1584 if (kvm_is_error_hva(ghc
->hva
))
1587 r
= __copy_to_user((void __user
*)ghc
->hva
, data
, len
);
1590 mark_page_dirty_in_slot(kvm
, ghc
->memslot
, ghc
->gpa
>> PAGE_SHIFT
);
1594 EXPORT_SYMBOL_GPL(kvm_write_guest_cached
);
1596 int kvm_read_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1597 void *data
, unsigned long len
)
1599 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1602 if (slots
->generation
!= ghc
->generation
)
1603 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
);
1605 if (kvm_is_error_hva(ghc
->hva
))
1608 r
= __copy_from_user(data
, (void __user
*)ghc
->hva
, len
);
1614 EXPORT_SYMBOL_GPL(kvm_read_guest_cached
);
1616 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
1618 return kvm_write_guest_page(kvm
, gfn
, (const void *) empty_zero_page
,
1621 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
1623 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
1625 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1627 int offset
= offset_in_page(gpa
);
1630 while ((seg
= next_segment(len
, offset
)) != 0) {
1631 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
1640 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
1642 void mark_page_dirty_in_slot(struct kvm
*kvm
, struct kvm_memory_slot
*memslot
,
1645 if (memslot
&& memslot
->dirty_bitmap
) {
1646 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
1648 set_bit_le(rel_gfn
, memslot
->dirty_bitmap
);
1652 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
1654 struct kvm_memory_slot
*memslot
;
1656 memslot
= gfn_to_memslot(kvm
, gfn
);
1657 mark_page_dirty_in_slot(kvm
, memslot
, gfn
);
1661 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1663 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
1668 prepare_to_wait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
1670 if (kvm_arch_vcpu_runnable(vcpu
)) {
1671 kvm_make_request(KVM_REQ_UNHALT
, vcpu
);
1674 if (kvm_cpu_has_pending_timer(vcpu
))
1676 if (signal_pending(current
))
1682 finish_wait(&vcpu
->wq
, &wait
);
1687 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
1689 void kvm_vcpu_kick(struct kvm_vcpu
*vcpu
)
1692 int cpu
= vcpu
->cpu
;
1693 wait_queue_head_t
*wqp
;
1695 wqp
= kvm_arch_vcpu_wq(vcpu
);
1696 if (waitqueue_active(wqp
)) {
1697 wake_up_interruptible(wqp
);
1698 ++vcpu
->stat
.halt_wakeup
;
1702 if (cpu
!= me
&& (unsigned)cpu
< nr_cpu_ids
&& cpu_online(cpu
))
1703 if (kvm_arch_vcpu_should_kick(vcpu
))
1704 smp_send_reschedule(cpu
);
1707 #endif /* !CONFIG_S390 */
1709 void kvm_resched(struct kvm_vcpu
*vcpu
)
1711 if (!need_resched())
1715 EXPORT_SYMBOL_GPL(kvm_resched
);
1717 bool kvm_vcpu_yield_to(struct kvm_vcpu
*target
)
1720 struct task_struct
*task
= NULL
;
1724 pid
= rcu_dereference(target
->pid
);
1726 task
= get_pid_task(target
->pid
, PIDTYPE_PID
);
1730 if (task
->flags
& PF_VCPU
) {
1731 put_task_struct(task
);
1734 ret
= yield_to(task
, 1);
1735 put_task_struct(task
);
1739 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to
);
1741 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
1743 * Helper that checks whether a VCPU is eligible for directed yield.
1744 * Most eligible candidate to yield is decided by following heuristics:
1746 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
1747 * (preempted lock holder), indicated by @in_spin_loop.
1748 * Set at the beiginning and cleared at the end of interception/PLE handler.
1750 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
1751 * chance last time (mostly it has become eligible now since we have probably
1752 * yielded to lockholder in last iteration. This is done by toggling
1753 * @dy_eligible each time a VCPU checked for eligibility.)
1755 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
1756 * to preempted lock-holder could result in wrong VCPU selection and CPU
1757 * burning. Giving priority for a potential lock-holder increases lock
1760 * Since algorithm is based on heuristics, accessing another VCPU data without
1761 * locking does not harm. It may result in trying to yield to same VCPU, fail
1762 * and continue with next VCPU and so on.
1764 bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu
*vcpu
)
1768 eligible
= !vcpu
->spin_loop
.in_spin_loop
||
1769 (vcpu
->spin_loop
.in_spin_loop
&&
1770 vcpu
->spin_loop
.dy_eligible
);
1772 if (vcpu
->spin_loop
.in_spin_loop
)
1773 kvm_vcpu_set_dy_eligible(vcpu
, !vcpu
->spin_loop
.dy_eligible
);
1779 void kvm_vcpu_on_spin(struct kvm_vcpu
*me
)
1781 struct kvm
*kvm
= me
->kvm
;
1782 struct kvm_vcpu
*vcpu
;
1783 int last_boosted_vcpu
= me
->kvm
->last_boosted_vcpu
;
1789 kvm_vcpu_set_in_spin_loop(me
, true);
1791 * We boost the priority of a VCPU that is runnable but not
1792 * currently running, because it got preempted by something
1793 * else and called schedule in __vcpu_run. Hopefully that
1794 * VCPU is holding the lock that we need and will release it.
1795 * We approximate round-robin by starting at the last boosted VCPU.
1797 for (pass
= 0; pass
< 2 && !yielded
&& try; pass
++) {
1798 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
1799 if (!pass
&& i
<= last_boosted_vcpu
) {
1800 i
= last_boosted_vcpu
;
1802 } else if (pass
&& i
> last_boosted_vcpu
)
1806 if (waitqueue_active(&vcpu
->wq
))
1808 if (!kvm_vcpu_eligible_for_directed_yield(vcpu
))
1811 yielded
= kvm_vcpu_yield_to(vcpu
);
1813 kvm
->last_boosted_vcpu
= i
;
1815 } else if (yielded
< 0) {
1822 kvm_vcpu_set_in_spin_loop(me
, false);
1824 /* Ensure vcpu is not eligible during next spinloop */
1825 kvm_vcpu_set_dy_eligible(me
, false);
1827 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin
);
1829 static int kvm_vcpu_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1831 struct kvm_vcpu
*vcpu
= vma
->vm_file
->private_data
;
1834 if (vmf
->pgoff
== 0)
1835 page
= virt_to_page(vcpu
->run
);
1837 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
1838 page
= virt_to_page(vcpu
->arch
.pio_data
);
1840 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1841 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
1842 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
1845 return kvm_arch_vcpu_fault(vcpu
, vmf
);
1851 static const struct vm_operations_struct kvm_vcpu_vm_ops
= {
1852 .fault
= kvm_vcpu_fault
,
1855 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1857 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
1861 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
1863 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1865 kvm_put_kvm(vcpu
->kvm
);
1869 static struct file_operations kvm_vcpu_fops
= {
1870 .release
= kvm_vcpu_release
,
1871 .unlocked_ioctl
= kvm_vcpu_ioctl
,
1872 #ifdef CONFIG_COMPAT
1873 .compat_ioctl
= kvm_vcpu_compat_ioctl
,
1875 .mmap
= kvm_vcpu_mmap
,
1876 .llseek
= noop_llseek
,
1880 * Allocates an inode for the vcpu.
1882 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
1884 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops
, vcpu
, O_RDWR
);
1888 * Creates some virtual cpus. Good luck creating more than one.
1890 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, u32 id
)
1893 struct kvm_vcpu
*vcpu
, *v
;
1895 vcpu
= kvm_arch_vcpu_create(kvm
, id
);
1897 return PTR_ERR(vcpu
);
1899 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
1901 r
= kvm_arch_vcpu_setup(vcpu
);
1905 mutex_lock(&kvm
->lock
);
1906 if (!kvm_vcpu_compatible(vcpu
)) {
1908 goto unlock_vcpu_destroy
;
1910 if (atomic_read(&kvm
->online_vcpus
) == KVM_MAX_VCPUS
) {
1912 goto unlock_vcpu_destroy
;
1915 kvm_for_each_vcpu(r
, v
, kvm
)
1916 if (v
->vcpu_id
== id
) {
1918 goto unlock_vcpu_destroy
;
1921 BUG_ON(kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)]);
1923 /* Now it's all set up, let userspace reach it */
1925 r
= create_vcpu_fd(vcpu
);
1928 goto unlock_vcpu_destroy
;
1931 kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)] = vcpu
;
1933 atomic_inc(&kvm
->online_vcpus
);
1935 mutex_unlock(&kvm
->lock
);
1936 kvm_arch_vcpu_postcreate(vcpu
);
1939 unlock_vcpu_destroy
:
1940 mutex_unlock(&kvm
->lock
);
1942 kvm_arch_vcpu_destroy(vcpu
);
1946 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
1949 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
1950 vcpu
->sigset_active
= 1;
1951 vcpu
->sigset
= *sigset
;
1953 vcpu
->sigset_active
= 0;
1957 static long kvm_vcpu_ioctl(struct file
*filp
,
1958 unsigned int ioctl
, unsigned long arg
)
1960 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1961 void __user
*argp
= (void __user
*)arg
;
1963 struct kvm_fpu
*fpu
= NULL
;
1964 struct kvm_sregs
*kvm_sregs
= NULL
;
1966 if (vcpu
->kvm
->mm
!= current
->mm
)
1969 #if defined(CONFIG_S390) || defined(CONFIG_PPC)
1971 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1972 * so vcpu_load() would break it.
1974 if (ioctl
== KVM_S390_INTERRUPT
|| ioctl
== KVM_INTERRUPT
)
1975 return kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
1979 r
= vcpu_load(vcpu
);
1987 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
1988 trace_kvm_userspace_exit(vcpu
->run
->exit_reason
, r
);
1990 case KVM_GET_REGS
: {
1991 struct kvm_regs
*kvm_regs
;
1994 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
1997 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
2001 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
2008 case KVM_SET_REGS
: {
2009 struct kvm_regs
*kvm_regs
;
2012 kvm_regs
= memdup_user(argp
, sizeof(*kvm_regs
));
2013 if (IS_ERR(kvm_regs
)) {
2014 r
= PTR_ERR(kvm_regs
);
2017 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
2021 case KVM_GET_SREGS
: {
2022 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
2026 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
2030 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
2035 case KVM_SET_SREGS
: {
2036 kvm_sregs
= memdup_user(argp
, sizeof(*kvm_sregs
));
2037 if (IS_ERR(kvm_sregs
)) {
2038 r
= PTR_ERR(kvm_sregs
);
2042 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
2045 case KVM_GET_MP_STATE
: {
2046 struct kvm_mp_state mp_state
;
2048 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
2052 if (copy_to_user(argp
, &mp_state
, sizeof mp_state
))
2057 case KVM_SET_MP_STATE
: {
2058 struct kvm_mp_state mp_state
;
2061 if (copy_from_user(&mp_state
, argp
, sizeof mp_state
))
2063 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
2066 case KVM_TRANSLATE
: {
2067 struct kvm_translation tr
;
2070 if (copy_from_user(&tr
, argp
, sizeof tr
))
2072 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
2076 if (copy_to_user(argp
, &tr
, sizeof tr
))
2081 case KVM_SET_GUEST_DEBUG
: {
2082 struct kvm_guest_debug dbg
;
2085 if (copy_from_user(&dbg
, argp
, sizeof dbg
))
2087 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
2090 case KVM_SET_SIGNAL_MASK
: {
2091 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2092 struct kvm_signal_mask kvm_sigmask
;
2093 sigset_t sigset
, *p
;
2098 if (copy_from_user(&kvm_sigmask
, argp
,
2099 sizeof kvm_sigmask
))
2102 if (kvm_sigmask
.len
!= sizeof sigset
)
2105 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
2110 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, p
);
2114 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
2118 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
2122 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
2128 fpu
= memdup_user(argp
, sizeof(*fpu
));
2134 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
2138 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2147 #ifdef CONFIG_COMPAT
2148 static long kvm_vcpu_compat_ioctl(struct file
*filp
,
2149 unsigned int ioctl
, unsigned long arg
)
2151 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2152 void __user
*argp
= compat_ptr(arg
);
2155 if (vcpu
->kvm
->mm
!= current
->mm
)
2159 case KVM_SET_SIGNAL_MASK
: {
2160 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2161 struct kvm_signal_mask kvm_sigmask
;
2162 compat_sigset_t csigset
;
2167 if (copy_from_user(&kvm_sigmask
, argp
,
2168 sizeof kvm_sigmask
))
2171 if (kvm_sigmask
.len
!= sizeof csigset
)
2174 if (copy_from_user(&csigset
, sigmask_arg
->sigset
,
2177 sigset_from_compat(&sigset
, &csigset
);
2178 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
2180 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, NULL
);
2184 r
= kvm_vcpu_ioctl(filp
, ioctl
, arg
);
2192 static long kvm_vm_ioctl(struct file
*filp
,
2193 unsigned int ioctl
, unsigned long arg
)
2195 struct kvm
*kvm
= filp
->private_data
;
2196 void __user
*argp
= (void __user
*)arg
;
2199 if (kvm
->mm
!= current
->mm
)
2202 case KVM_CREATE_VCPU
:
2203 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
2205 case KVM_SET_USER_MEMORY_REGION
: {
2206 struct kvm_userspace_memory_region kvm_userspace_mem
;
2209 if (copy_from_user(&kvm_userspace_mem
, argp
,
2210 sizeof kvm_userspace_mem
))
2213 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
, true);
2216 case KVM_GET_DIRTY_LOG
: {
2217 struct kvm_dirty_log log
;
2220 if (copy_from_user(&log
, argp
, sizeof log
))
2222 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2225 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2226 case KVM_REGISTER_COALESCED_MMIO
: {
2227 struct kvm_coalesced_mmio_zone zone
;
2229 if (copy_from_user(&zone
, argp
, sizeof zone
))
2231 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
2234 case KVM_UNREGISTER_COALESCED_MMIO
: {
2235 struct kvm_coalesced_mmio_zone zone
;
2237 if (copy_from_user(&zone
, argp
, sizeof zone
))
2239 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
2244 struct kvm_irqfd data
;
2247 if (copy_from_user(&data
, argp
, sizeof data
))
2249 r
= kvm_irqfd(kvm
, &data
);
2252 case KVM_IOEVENTFD
: {
2253 struct kvm_ioeventfd data
;
2256 if (copy_from_user(&data
, argp
, sizeof data
))
2258 r
= kvm_ioeventfd(kvm
, &data
);
2261 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2262 case KVM_SET_BOOT_CPU_ID
:
2264 mutex_lock(&kvm
->lock
);
2265 if (atomic_read(&kvm
->online_vcpus
) != 0)
2268 kvm
->bsp_vcpu_id
= arg
;
2269 mutex_unlock(&kvm
->lock
);
2272 #ifdef CONFIG_HAVE_KVM_MSI
2273 case KVM_SIGNAL_MSI
: {
2277 if (copy_from_user(&msi
, argp
, sizeof msi
))
2279 r
= kvm_send_userspace_msi(kvm
, &msi
);
2283 #ifdef __KVM_HAVE_IRQ_LINE
2284 case KVM_IRQ_LINE_STATUS
:
2285 case KVM_IRQ_LINE
: {
2286 struct kvm_irq_level irq_event
;
2289 if (copy_from_user(&irq_event
, argp
, sizeof irq_event
))
2292 r
= kvm_vm_ioctl_irq_line(kvm
, &irq_event
);
2297 if (ioctl
== KVM_IRQ_LINE_STATUS
) {
2298 if (copy_to_user(argp
, &irq_event
, sizeof irq_event
))
2307 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
2309 r
= kvm_vm_ioctl_assigned_device(kvm
, ioctl
, arg
);
2315 #ifdef CONFIG_COMPAT
2316 struct compat_kvm_dirty_log
{
2320 compat_uptr_t dirty_bitmap
; /* one bit per page */
2325 static long kvm_vm_compat_ioctl(struct file
*filp
,
2326 unsigned int ioctl
, unsigned long arg
)
2328 struct kvm
*kvm
= filp
->private_data
;
2331 if (kvm
->mm
!= current
->mm
)
2334 case KVM_GET_DIRTY_LOG
: {
2335 struct compat_kvm_dirty_log compat_log
;
2336 struct kvm_dirty_log log
;
2339 if (copy_from_user(&compat_log
, (void __user
*)arg
,
2340 sizeof(compat_log
)))
2342 log
.slot
= compat_log
.slot
;
2343 log
.padding1
= compat_log
.padding1
;
2344 log
.padding2
= compat_log
.padding2
;
2345 log
.dirty_bitmap
= compat_ptr(compat_log
.dirty_bitmap
);
2347 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2351 r
= kvm_vm_ioctl(filp
, ioctl
, arg
);
2359 static int kvm_vm_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
2361 struct page
*page
[1];
2364 gfn_t gfn
= vmf
->pgoff
;
2365 struct kvm
*kvm
= vma
->vm_file
->private_data
;
2367 addr
= gfn_to_hva(kvm
, gfn
);
2368 if (kvm_is_error_hva(addr
))
2369 return VM_FAULT_SIGBUS
;
2371 npages
= get_user_pages(current
, current
->mm
, addr
, 1, 1, 0, page
,
2373 if (unlikely(npages
!= 1))
2374 return VM_FAULT_SIGBUS
;
2376 vmf
->page
= page
[0];
2380 static const struct vm_operations_struct kvm_vm_vm_ops
= {
2381 .fault
= kvm_vm_fault
,
2384 static int kvm_vm_mmap(struct file
*file
, struct vm_area_struct
*vma
)
2386 vma
->vm_ops
= &kvm_vm_vm_ops
;
2390 static struct file_operations kvm_vm_fops
= {
2391 .release
= kvm_vm_release
,
2392 .unlocked_ioctl
= kvm_vm_ioctl
,
2393 #ifdef CONFIG_COMPAT
2394 .compat_ioctl
= kvm_vm_compat_ioctl
,
2396 .mmap
= kvm_vm_mmap
,
2397 .llseek
= noop_llseek
,
2400 static int kvm_dev_ioctl_create_vm(unsigned long type
)
2405 kvm
= kvm_create_vm(type
);
2407 return PTR_ERR(kvm
);
2408 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2409 r
= kvm_coalesced_mmio_init(kvm
);
2415 r
= anon_inode_getfd("kvm-vm", &kvm_vm_fops
, kvm
, O_RDWR
);
2422 static long kvm_dev_ioctl_check_extension_generic(long arg
)
2425 case KVM_CAP_USER_MEMORY
:
2426 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
2427 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
2428 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2429 case KVM_CAP_SET_BOOT_CPU_ID
:
2431 case KVM_CAP_INTERNAL_ERROR_DATA
:
2432 #ifdef CONFIG_HAVE_KVM_MSI
2433 case KVM_CAP_SIGNAL_MSI
:
2436 #ifdef KVM_CAP_IRQ_ROUTING
2437 case KVM_CAP_IRQ_ROUTING
:
2438 return KVM_MAX_IRQ_ROUTES
;
2443 return kvm_dev_ioctl_check_extension(arg
);
2446 static long kvm_dev_ioctl(struct file
*filp
,
2447 unsigned int ioctl
, unsigned long arg
)
2452 case KVM_GET_API_VERSION
:
2456 r
= KVM_API_VERSION
;
2459 r
= kvm_dev_ioctl_create_vm(arg
);
2461 case KVM_CHECK_EXTENSION
:
2462 r
= kvm_dev_ioctl_check_extension_generic(arg
);
2464 case KVM_GET_VCPU_MMAP_SIZE
:
2468 r
= PAGE_SIZE
; /* struct kvm_run */
2470 r
+= PAGE_SIZE
; /* pio data page */
2472 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2473 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
2476 case KVM_TRACE_ENABLE
:
2477 case KVM_TRACE_PAUSE
:
2478 case KVM_TRACE_DISABLE
:
2482 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
2488 static struct file_operations kvm_chardev_ops
= {
2489 .unlocked_ioctl
= kvm_dev_ioctl
,
2490 .compat_ioctl
= kvm_dev_ioctl
,
2491 .llseek
= noop_llseek
,
2494 static struct miscdevice kvm_dev
= {
2500 static void hardware_enable_nolock(void *junk
)
2502 int cpu
= raw_smp_processor_id();
2505 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2508 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
2510 r
= kvm_arch_hardware_enable(NULL
);
2513 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2514 atomic_inc(&hardware_enable_failed
);
2515 printk(KERN_INFO
"kvm: enabling virtualization on "
2516 "CPU%d failed\n", cpu
);
2520 static void hardware_enable(void *junk
)
2522 raw_spin_lock(&kvm_lock
);
2523 hardware_enable_nolock(junk
);
2524 raw_spin_unlock(&kvm_lock
);
2527 static void hardware_disable_nolock(void *junk
)
2529 int cpu
= raw_smp_processor_id();
2531 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2533 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2534 kvm_arch_hardware_disable(NULL
);
2537 static void hardware_disable(void *junk
)
2539 raw_spin_lock(&kvm_lock
);
2540 hardware_disable_nolock(junk
);
2541 raw_spin_unlock(&kvm_lock
);
2544 static void hardware_disable_all_nolock(void)
2546 BUG_ON(!kvm_usage_count
);
2549 if (!kvm_usage_count
)
2550 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2553 static void hardware_disable_all(void)
2555 raw_spin_lock(&kvm_lock
);
2556 hardware_disable_all_nolock();
2557 raw_spin_unlock(&kvm_lock
);
2560 static int hardware_enable_all(void)
2564 raw_spin_lock(&kvm_lock
);
2567 if (kvm_usage_count
== 1) {
2568 atomic_set(&hardware_enable_failed
, 0);
2569 on_each_cpu(hardware_enable_nolock
, NULL
, 1);
2571 if (atomic_read(&hardware_enable_failed
)) {
2572 hardware_disable_all_nolock();
2577 raw_spin_unlock(&kvm_lock
);
2582 static int kvm_cpu_hotplug(struct notifier_block
*notifier
, unsigned long val
,
2587 if (!kvm_usage_count
)
2590 val
&= ~CPU_TASKS_FROZEN
;
2593 printk(KERN_INFO
"kvm: disabling virtualization on CPU%d\n",
2595 hardware_disable(NULL
);
2598 printk(KERN_INFO
"kvm: enabling virtualization on CPU%d\n",
2600 hardware_enable(NULL
);
2607 asmlinkage
void kvm_spurious_fault(void)
2609 /* Fault while not rebooting. We want the trace. */
2612 EXPORT_SYMBOL_GPL(kvm_spurious_fault
);
2614 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
2618 * Some (well, at least mine) BIOSes hang on reboot if
2621 * And Intel TXT required VMX off for all cpu when system shutdown.
2623 printk(KERN_INFO
"kvm: exiting hardware virtualization\n");
2624 kvm_rebooting
= true;
2625 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2629 static struct notifier_block kvm_reboot_notifier
= {
2630 .notifier_call
= kvm_reboot
,
2634 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
2638 for (i
= 0; i
< bus
->dev_count
; i
++) {
2639 struct kvm_io_device
*pos
= bus
->range
[i
].dev
;
2641 kvm_iodevice_destructor(pos
);
2646 int kvm_io_bus_sort_cmp(const void *p1
, const void *p2
)
2648 const struct kvm_io_range
*r1
= p1
;
2649 const struct kvm_io_range
*r2
= p2
;
2651 if (r1
->addr
< r2
->addr
)
2653 if (r1
->addr
+ r1
->len
> r2
->addr
+ r2
->len
)
2658 int kvm_io_bus_insert_dev(struct kvm_io_bus
*bus
, struct kvm_io_device
*dev
,
2659 gpa_t addr
, int len
)
2661 bus
->range
[bus
->dev_count
++] = (struct kvm_io_range
) {
2667 sort(bus
->range
, bus
->dev_count
, sizeof(struct kvm_io_range
),
2668 kvm_io_bus_sort_cmp
, NULL
);
2673 int kvm_io_bus_get_first_dev(struct kvm_io_bus
*bus
,
2674 gpa_t addr
, int len
)
2676 struct kvm_io_range
*range
, key
;
2679 key
= (struct kvm_io_range
) {
2684 range
= bsearch(&key
, bus
->range
, bus
->dev_count
,
2685 sizeof(struct kvm_io_range
), kvm_io_bus_sort_cmp
);
2689 off
= range
- bus
->range
;
2691 while (off
> 0 && kvm_io_bus_sort_cmp(&key
, &bus
->range
[off
-1]) == 0)
2697 /* kvm_io_bus_write - called under kvm->slots_lock */
2698 int kvm_io_bus_write(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2699 int len
, const void *val
)
2702 struct kvm_io_bus
*bus
;
2703 struct kvm_io_range range
;
2705 range
= (struct kvm_io_range
) {
2710 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2711 idx
= kvm_io_bus_get_first_dev(bus
, addr
, len
);
2715 while (idx
< bus
->dev_count
&&
2716 kvm_io_bus_sort_cmp(&range
, &bus
->range
[idx
]) == 0) {
2717 if (!kvm_iodevice_write(bus
->range
[idx
].dev
, addr
, len
, val
))
2725 /* kvm_io_bus_read - called under kvm->slots_lock */
2726 int kvm_io_bus_read(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2730 struct kvm_io_bus
*bus
;
2731 struct kvm_io_range range
;
2733 range
= (struct kvm_io_range
) {
2738 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2739 idx
= kvm_io_bus_get_first_dev(bus
, addr
, len
);
2743 while (idx
< bus
->dev_count
&&
2744 kvm_io_bus_sort_cmp(&range
, &bus
->range
[idx
]) == 0) {
2745 if (!kvm_iodevice_read(bus
->range
[idx
].dev
, addr
, len
, val
))
2753 /* Caller must hold slots_lock. */
2754 int kvm_io_bus_register_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2755 int len
, struct kvm_io_device
*dev
)
2757 struct kvm_io_bus
*new_bus
, *bus
;
2759 bus
= kvm
->buses
[bus_idx
];
2760 if (bus
->dev_count
> NR_IOBUS_DEVS
- 1)
2763 new_bus
= kzalloc(sizeof(*bus
) + ((bus
->dev_count
+ 1) *
2764 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
2767 memcpy(new_bus
, bus
, sizeof(*bus
) + (bus
->dev_count
*
2768 sizeof(struct kvm_io_range
)));
2769 kvm_io_bus_insert_dev(new_bus
, dev
, addr
, len
);
2770 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
2771 synchronize_srcu_expedited(&kvm
->srcu
);
2777 /* Caller must hold slots_lock. */
2778 int kvm_io_bus_unregister_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
2779 struct kvm_io_device
*dev
)
2782 struct kvm_io_bus
*new_bus
, *bus
;
2784 bus
= kvm
->buses
[bus_idx
];
2786 for (i
= 0; i
< bus
->dev_count
; i
++)
2787 if (bus
->range
[i
].dev
== dev
) {
2795 new_bus
= kzalloc(sizeof(*bus
) + ((bus
->dev_count
- 1) *
2796 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
2800 memcpy(new_bus
, bus
, sizeof(*bus
) + i
* sizeof(struct kvm_io_range
));
2801 new_bus
->dev_count
--;
2802 memcpy(new_bus
->range
+ i
, bus
->range
+ i
+ 1,
2803 (new_bus
->dev_count
- i
) * sizeof(struct kvm_io_range
));
2805 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
2806 synchronize_srcu_expedited(&kvm
->srcu
);
2811 static struct notifier_block kvm_cpu_notifier
= {
2812 .notifier_call
= kvm_cpu_hotplug
,
2815 static int vm_stat_get(void *_offset
, u64
*val
)
2817 unsigned offset
= (long)_offset
;
2821 raw_spin_lock(&kvm_lock
);
2822 list_for_each_entry(kvm
, &vm_list
, vm_list
)
2823 *val
+= *(u32
*)((void *)kvm
+ offset
);
2824 raw_spin_unlock(&kvm_lock
);
2828 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, NULL
, "%llu\n");
2830 static int vcpu_stat_get(void *_offset
, u64
*val
)
2832 unsigned offset
= (long)_offset
;
2834 struct kvm_vcpu
*vcpu
;
2838 raw_spin_lock(&kvm_lock
);
2839 list_for_each_entry(kvm
, &vm_list
, vm_list
)
2840 kvm_for_each_vcpu(i
, vcpu
, kvm
)
2841 *val
+= *(u32
*)((void *)vcpu
+ offset
);
2843 raw_spin_unlock(&kvm_lock
);
2847 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, NULL
, "%llu\n");
2849 static const struct file_operations
*stat_fops
[] = {
2850 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
2851 [KVM_STAT_VM
] = &vm_stat_fops
,
2854 static int kvm_init_debug(void)
2857 struct kvm_stats_debugfs_item
*p
;
2859 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
2860 if (kvm_debugfs_dir
== NULL
)
2863 for (p
= debugfs_entries
; p
->name
; ++p
) {
2864 p
->dentry
= debugfs_create_file(p
->name
, 0444, kvm_debugfs_dir
,
2865 (void *)(long)p
->offset
,
2866 stat_fops
[p
->kind
]);
2867 if (p
->dentry
== NULL
)
2874 debugfs_remove_recursive(kvm_debugfs_dir
);
2879 static void kvm_exit_debug(void)
2881 struct kvm_stats_debugfs_item
*p
;
2883 for (p
= debugfs_entries
; p
->name
; ++p
)
2884 debugfs_remove(p
->dentry
);
2885 debugfs_remove(kvm_debugfs_dir
);
2888 static int kvm_suspend(void)
2890 if (kvm_usage_count
)
2891 hardware_disable_nolock(NULL
);
2895 static void kvm_resume(void)
2897 if (kvm_usage_count
) {
2898 WARN_ON(raw_spin_is_locked(&kvm_lock
));
2899 hardware_enable_nolock(NULL
);
2903 static struct syscore_ops kvm_syscore_ops
= {
2904 .suspend
= kvm_suspend
,
2905 .resume
= kvm_resume
,
2909 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
2911 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
2914 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
2916 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
2918 kvm_arch_vcpu_load(vcpu
, cpu
);
2921 static void kvm_sched_out(struct preempt_notifier
*pn
,
2922 struct task_struct
*next
)
2924 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
2926 kvm_arch_vcpu_put(vcpu
);
2929 int kvm_init(void *opaque
, unsigned vcpu_size
, unsigned vcpu_align
,
2930 struct module
*module
)
2935 r
= kvm_arch_init(opaque
);
2939 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
2944 r
= kvm_arch_hardware_setup();
2948 for_each_online_cpu(cpu
) {
2949 smp_call_function_single(cpu
,
2950 kvm_arch_check_processor_compat
,
2956 r
= register_cpu_notifier(&kvm_cpu_notifier
);
2959 register_reboot_notifier(&kvm_reboot_notifier
);
2961 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2963 vcpu_align
= __alignof__(struct kvm_vcpu
);
2964 kvm_vcpu_cache
= kmem_cache_create("kvm_vcpu", vcpu_size
, vcpu_align
,
2966 if (!kvm_vcpu_cache
) {
2971 r
= kvm_async_pf_init();
2975 kvm_chardev_ops
.owner
= module
;
2976 kvm_vm_fops
.owner
= module
;
2977 kvm_vcpu_fops
.owner
= module
;
2979 r
= misc_register(&kvm_dev
);
2981 printk(KERN_ERR
"kvm: misc device register failed\n");
2985 register_syscore_ops(&kvm_syscore_ops
);
2987 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
2988 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
2990 r
= kvm_init_debug();
2992 printk(KERN_ERR
"kvm: create debugfs files failed\n");
2999 unregister_syscore_ops(&kvm_syscore_ops
);
3001 kvm_async_pf_deinit();
3003 kmem_cache_destroy(kvm_vcpu_cache
);
3005 unregister_reboot_notifier(&kvm_reboot_notifier
);
3006 unregister_cpu_notifier(&kvm_cpu_notifier
);
3009 kvm_arch_hardware_unsetup();
3011 free_cpumask_var(cpus_hardware_enabled
);
3017 EXPORT_SYMBOL_GPL(kvm_init
);
3022 misc_deregister(&kvm_dev
);
3023 kmem_cache_destroy(kvm_vcpu_cache
);
3024 kvm_async_pf_deinit();
3025 unregister_syscore_ops(&kvm_syscore_ops
);
3026 unregister_reboot_notifier(&kvm_reboot_notifier
);
3027 unregister_cpu_notifier(&kvm_cpu_notifier
);
3028 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3029 kvm_arch_hardware_unsetup();
3031 free_cpumask_var(cpus_hardware_enabled
);
3033 EXPORT_SYMBOL_GPL(kvm_exit
);