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
)
106 return PageReserved(pfn_to_page(pfn
));
112 * Switches to specified vcpu, until a matching vcpu_put()
114 int vcpu_load(struct kvm_vcpu
*vcpu
)
118 if (mutex_lock_killable(&vcpu
->mutex
))
120 if (unlikely(vcpu
->pid
!= current
->pids
[PIDTYPE_PID
].pid
)) {
121 /* The thread running this VCPU changed. */
122 struct pid
*oldpid
= vcpu
->pid
;
123 struct pid
*newpid
= get_task_pid(current
, PIDTYPE_PID
);
124 rcu_assign_pointer(vcpu
->pid
, newpid
);
129 preempt_notifier_register(&vcpu
->preempt_notifier
);
130 kvm_arch_vcpu_load(vcpu
, cpu
);
135 void vcpu_put(struct kvm_vcpu
*vcpu
)
138 kvm_arch_vcpu_put(vcpu
);
139 preempt_notifier_unregister(&vcpu
->preempt_notifier
);
141 mutex_unlock(&vcpu
->mutex
);
144 static void ack_flush(void *_completed
)
148 static bool make_all_cpus_request(struct kvm
*kvm
, unsigned int req
)
153 struct kvm_vcpu
*vcpu
;
155 zalloc_cpumask_var(&cpus
, GFP_ATOMIC
);
158 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
159 kvm_make_request(req
, vcpu
);
162 /* Set ->requests bit before we read ->mode */
165 if (cpus
!= NULL
&& cpu
!= -1 && cpu
!= me
&&
166 kvm_vcpu_exiting_guest_mode(vcpu
) != OUTSIDE_GUEST_MODE
)
167 cpumask_set_cpu(cpu
, cpus
);
169 if (unlikely(cpus
== NULL
))
170 smp_call_function_many(cpu_online_mask
, ack_flush
, NULL
, 1);
171 else if (!cpumask_empty(cpus
))
172 smp_call_function_many(cpus
, ack_flush
, NULL
, 1);
176 free_cpumask_var(cpus
);
180 void kvm_flush_remote_tlbs(struct kvm
*kvm
)
182 long dirty_count
= kvm
->tlbs_dirty
;
185 if (make_all_cpus_request(kvm
, KVM_REQ_TLB_FLUSH
))
186 ++kvm
->stat
.remote_tlb_flush
;
187 cmpxchg(&kvm
->tlbs_dirty
, dirty_count
, 0);
190 void kvm_reload_remote_mmus(struct kvm
*kvm
)
192 make_all_cpus_request(kvm
, KVM_REQ_MMU_RELOAD
);
195 void kvm_make_mclock_inprogress_request(struct kvm
*kvm
)
197 make_all_cpus_request(kvm
, KVM_REQ_MCLOCK_INPROGRESS
);
200 void kvm_make_scan_ioapic_request(struct kvm
*kvm
)
202 make_all_cpus_request(kvm
, KVM_REQ_SCAN_IOAPIC
);
205 int kvm_vcpu_init(struct kvm_vcpu
*vcpu
, struct kvm
*kvm
, unsigned id
)
210 mutex_init(&vcpu
->mutex
);
215 init_waitqueue_head(&vcpu
->wq
);
216 kvm_async_pf_vcpu_init(vcpu
);
218 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
223 vcpu
->run
= page_address(page
);
225 kvm_vcpu_set_in_spin_loop(vcpu
, false);
226 kvm_vcpu_set_dy_eligible(vcpu
, false);
227 vcpu
->preempted
= false;
229 r
= kvm_arch_vcpu_init(vcpu
);
235 free_page((unsigned long)vcpu
->run
);
239 EXPORT_SYMBOL_GPL(kvm_vcpu_init
);
241 void kvm_vcpu_uninit(struct kvm_vcpu
*vcpu
)
244 kvm_arch_vcpu_uninit(vcpu
);
245 free_page((unsigned long)vcpu
->run
);
247 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit
);
249 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
250 static inline struct kvm
*mmu_notifier_to_kvm(struct mmu_notifier
*mn
)
252 return container_of(mn
, struct kvm
, mmu_notifier
);
255 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier
*mn
,
256 struct mm_struct
*mm
,
257 unsigned long address
)
259 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
260 int need_tlb_flush
, idx
;
263 * When ->invalidate_page runs, the linux pte has been zapped
264 * already but the page is still allocated until
265 * ->invalidate_page returns. So if we increase the sequence
266 * here the kvm page fault will notice if the spte can't be
267 * established because the page is going to be freed. If
268 * instead the kvm page fault establishes the spte before
269 * ->invalidate_page runs, kvm_unmap_hva will release it
272 * The sequence increase only need to be seen at spin_unlock
273 * time, and not at spin_lock time.
275 * Increasing the sequence after the spin_unlock would be
276 * unsafe because the kvm page fault could then establish the
277 * pte after kvm_unmap_hva returned, without noticing the page
278 * is going to be freed.
280 idx
= srcu_read_lock(&kvm
->srcu
);
281 spin_lock(&kvm
->mmu_lock
);
283 kvm
->mmu_notifier_seq
++;
284 need_tlb_flush
= kvm_unmap_hva(kvm
, address
) | kvm
->tlbs_dirty
;
285 /* we've to flush the tlb before the pages can be freed */
287 kvm_flush_remote_tlbs(kvm
);
289 spin_unlock(&kvm
->mmu_lock
);
290 srcu_read_unlock(&kvm
->srcu
, idx
);
293 static void kvm_mmu_notifier_change_pte(struct mmu_notifier
*mn
,
294 struct mm_struct
*mm
,
295 unsigned long address
,
298 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
301 idx
= srcu_read_lock(&kvm
->srcu
);
302 spin_lock(&kvm
->mmu_lock
);
303 kvm
->mmu_notifier_seq
++;
304 kvm_set_spte_hva(kvm
, address
, pte
);
305 spin_unlock(&kvm
->mmu_lock
);
306 srcu_read_unlock(&kvm
->srcu
, idx
);
309 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier
*mn
,
310 struct mm_struct
*mm
,
314 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
315 int need_tlb_flush
= 0, idx
;
317 idx
= srcu_read_lock(&kvm
->srcu
);
318 spin_lock(&kvm
->mmu_lock
);
320 * The count increase must become visible at unlock time as no
321 * spte can be established without taking the mmu_lock and
322 * count is also read inside the mmu_lock critical section.
324 kvm
->mmu_notifier_count
++;
325 need_tlb_flush
= kvm_unmap_hva_range(kvm
, start
, end
);
326 need_tlb_flush
|= kvm
->tlbs_dirty
;
327 /* we've to flush the tlb before the pages can be freed */
329 kvm_flush_remote_tlbs(kvm
);
331 spin_unlock(&kvm
->mmu_lock
);
332 srcu_read_unlock(&kvm
->srcu
, idx
);
335 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier
*mn
,
336 struct mm_struct
*mm
,
340 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
342 spin_lock(&kvm
->mmu_lock
);
344 * This sequence increase will notify the kvm page fault that
345 * the page that is going to be mapped in the spte could have
348 kvm
->mmu_notifier_seq
++;
351 * The above sequence increase must be visible before the
352 * below count decrease, which is ensured by the smp_wmb above
353 * in conjunction with the smp_rmb in mmu_notifier_retry().
355 kvm
->mmu_notifier_count
--;
356 spin_unlock(&kvm
->mmu_lock
);
358 BUG_ON(kvm
->mmu_notifier_count
< 0);
361 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier
*mn
,
362 struct mm_struct
*mm
,
363 unsigned long address
)
365 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
368 idx
= srcu_read_lock(&kvm
->srcu
);
369 spin_lock(&kvm
->mmu_lock
);
371 young
= kvm_age_hva(kvm
, address
);
373 kvm_flush_remote_tlbs(kvm
);
375 spin_unlock(&kvm
->mmu_lock
);
376 srcu_read_unlock(&kvm
->srcu
, idx
);
381 static int kvm_mmu_notifier_test_young(struct mmu_notifier
*mn
,
382 struct mm_struct
*mm
,
383 unsigned long address
)
385 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
388 idx
= srcu_read_lock(&kvm
->srcu
);
389 spin_lock(&kvm
->mmu_lock
);
390 young
= kvm_test_age_hva(kvm
, address
);
391 spin_unlock(&kvm
->mmu_lock
);
392 srcu_read_unlock(&kvm
->srcu
, idx
);
397 static void kvm_mmu_notifier_release(struct mmu_notifier
*mn
,
398 struct mm_struct
*mm
)
400 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
403 idx
= srcu_read_lock(&kvm
->srcu
);
404 kvm_arch_flush_shadow_all(kvm
);
405 srcu_read_unlock(&kvm
->srcu
, idx
);
408 static const struct mmu_notifier_ops kvm_mmu_notifier_ops
= {
409 .invalidate_page
= kvm_mmu_notifier_invalidate_page
,
410 .invalidate_range_start
= kvm_mmu_notifier_invalidate_range_start
,
411 .invalidate_range_end
= kvm_mmu_notifier_invalidate_range_end
,
412 .clear_flush_young
= kvm_mmu_notifier_clear_flush_young
,
413 .test_young
= kvm_mmu_notifier_test_young
,
414 .change_pte
= kvm_mmu_notifier_change_pte
,
415 .release
= kvm_mmu_notifier_release
,
418 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
420 kvm
->mmu_notifier
.ops
= &kvm_mmu_notifier_ops
;
421 return mmu_notifier_register(&kvm
->mmu_notifier
, current
->mm
);
424 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
426 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
431 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
433 static void kvm_init_memslots_id(struct kvm
*kvm
)
436 struct kvm_memslots
*slots
= kvm
->memslots
;
438 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
439 slots
->id_to_index
[i
] = slots
->memslots
[i
].id
= i
;
442 static struct kvm
*kvm_create_vm(unsigned long type
)
445 struct kvm
*kvm
= kvm_arch_alloc_vm();
448 return ERR_PTR(-ENOMEM
);
450 r
= kvm_arch_init_vm(kvm
, type
);
452 goto out_err_nodisable
;
454 r
= hardware_enable_all();
456 goto out_err_nodisable
;
458 #ifdef CONFIG_HAVE_KVM_IRQCHIP
459 INIT_HLIST_HEAD(&kvm
->mask_notifier_list
);
460 INIT_HLIST_HEAD(&kvm
->irq_ack_notifier_list
);
463 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM
> SHRT_MAX
);
466 kvm
->memslots
= kzalloc(sizeof(struct kvm_memslots
), GFP_KERNEL
);
469 kvm_init_memslots_id(kvm
);
470 if (init_srcu_struct(&kvm
->srcu
))
472 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
473 kvm
->buses
[i
] = kzalloc(sizeof(struct kvm_io_bus
),
479 spin_lock_init(&kvm
->mmu_lock
);
480 kvm
->mm
= current
->mm
;
481 atomic_inc(&kvm
->mm
->mm_count
);
482 kvm_eventfd_init(kvm
);
483 mutex_init(&kvm
->lock
);
484 mutex_init(&kvm
->irq_lock
);
485 mutex_init(&kvm
->slots_lock
);
486 atomic_set(&kvm
->users_count
, 1);
487 INIT_LIST_HEAD(&kvm
->devices
);
489 r
= kvm_init_mmu_notifier(kvm
);
493 raw_spin_lock(&kvm_lock
);
494 list_add(&kvm
->vm_list
, &vm_list
);
495 raw_spin_unlock(&kvm_lock
);
500 cleanup_srcu_struct(&kvm
->srcu
);
502 hardware_disable_all();
504 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
505 kfree(kvm
->buses
[i
]);
506 kfree(kvm
->memslots
);
507 kvm_arch_free_vm(kvm
);
512 * Avoid using vmalloc for a small buffer.
513 * Should not be used when the size is statically known.
515 void *kvm_kvzalloc(unsigned long size
)
517 if (size
> PAGE_SIZE
)
518 return vzalloc(size
);
520 return kzalloc(size
, GFP_KERNEL
);
523 void kvm_kvfree(const void *addr
)
525 if (is_vmalloc_addr(addr
))
531 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot
*memslot
)
533 if (!memslot
->dirty_bitmap
)
536 kvm_kvfree(memslot
->dirty_bitmap
);
537 memslot
->dirty_bitmap
= NULL
;
541 * Free any memory in @free but not in @dont.
543 static void kvm_free_physmem_slot(struct kvm_memory_slot
*free
,
544 struct kvm_memory_slot
*dont
)
546 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
547 kvm_destroy_dirty_bitmap(free
);
549 kvm_arch_free_memslot(free
, dont
);
554 void kvm_free_physmem(struct kvm
*kvm
)
556 struct kvm_memslots
*slots
= kvm
->memslots
;
557 struct kvm_memory_slot
*memslot
;
559 kvm_for_each_memslot(memslot
, slots
)
560 kvm_free_physmem_slot(memslot
, NULL
);
562 kfree(kvm
->memslots
);
565 static void kvm_destroy_devices(struct kvm
*kvm
)
567 struct list_head
*node
, *tmp
;
569 list_for_each_safe(node
, tmp
, &kvm
->devices
) {
570 struct kvm_device
*dev
=
571 list_entry(node
, struct kvm_device
, vm_node
);
574 dev
->ops
->destroy(dev
);
578 static void kvm_destroy_vm(struct kvm
*kvm
)
581 struct mm_struct
*mm
= kvm
->mm
;
583 kvm_arch_sync_events(kvm
);
584 raw_spin_lock(&kvm_lock
);
585 list_del(&kvm
->vm_list
);
586 raw_spin_unlock(&kvm_lock
);
587 kvm_free_irq_routing(kvm
);
588 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
589 kvm_io_bus_destroy(kvm
->buses
[i
]);
590 kvm_coalesced_mmio_free(kvm
);
591 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
592 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
594 kvm_arch_flush_shadow_all(kvm
);
596 kvm_arch_destroy_vm(kvm
);
597 kvm_destroy_devices(kvm
);
598 kvm_free_physmem(kvm
);
599 cleanup_srcu_struct(&kvm
->srcu
);
600 kvm_arch_free_vm(kvm
);
601 hardware_disable_all();
605 void kvm_get_kvm(struct kvm
*kvm
)
607 atomic_inc(&kvm
->users_count
);
609 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
611 void kvm_put_kvm(struct kvm
*kvm
)
613 if (atomic_dec_and_test(&kvm
->users_count
))
616 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
619 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
621 struct kvm
*kvm
= filp
->private_data
;
623 kvm_irqfd_release(kvm
);
630 * Allocation size is twice as large as the actual dirty bitmap size.
631 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
633 static int kvm_create_dirty_bitmap(struct kvm_memory_slot
*memslot
)
636 unsigned long dirty_bytes
= 2 * kvm_dirty_bitmap_bytes(memslot
);
638 memslot
->dirty_bitmap
= kvm_kvzalloc(dirty_bytes
);
639 if (!memslot
->dirty_bitmap
)
642 #endif /* !CONFIG_S390 */
646 static int cmp_memslot(const void *slot1
, const void *slot2
)
648 struct kvm_memory_slot
*s1
, *s2
;
650 s1
= (struct kvm_memory_slot
*)slot1
;
651 s2
= (struct kvm_memory_slot
*)slot2
;
653 if (s1
->npages
< s2
->npages
)
655 if (s1
->npages
> s2
->npages
)
662 * Sort the memslots base on its size, so the larger slots
663 * will get better fit.
665 static void sort_memslots(struct kvm_memslots
*slots
)
669 sort(slots
->memslots
, KVM_MEM_SLOTS_NUM
,
670 sizeof(struct kvm_memory_slot
), cmp_memslot
, NULL
);
672 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
673 slots
->id_to_index
[slots
->memslots
[i
].id
] = i
;
676 void update_memslots(struct kvm_memslots
*slots
, struct kvm_memory_slot
*new,
681 struct kvm_memory_slot
*old
= id_to_memslot(slots
, id
);
682 unsigned long npages
= old
->npages
;
685 if (new->npages
!= npages
)
686 sort_memslots(slots
);
689 slots
->generation
= last_generation
+ 1;
692 static int check_memory_region_flags(struct kvm_userspace_memory_region
*mem
)
694 u32 valid_flags
= KVM_MEM_LOG_DIRTY_PAGES
;
696 #ifdef KVM_CAP_READONLY_MEM
697 valid_flags
|= KVM_MEM_READONLY
;
700 if (mem
->flags
& ~valid_flags
)
706 static struct kvm_memslots
*install_new_memslots(struct kvm
*kvm
,
707 struct kvm_memslots
*slots
, struct kvm_memory_slot
*new)
709 struct kvm_memslots
*old_memslots
= kvm
->memslots
;
711 update_memslots(slots
, new, kvm
->memslots
->generation
);
712 rcu_assign_pointer(kvm
->memslots
, slots
);
713 synchronize_srcu_expedited(&kvm
->srcu
);
715 kvm_arch_memslots_updated(kvm
);
721 * Allocate some memory and give it an address in the guest physical address
724 * Discontiguous memory is allowed, mostly for framebuffers.
726 * Must be called holding mmap_sem for write.
728 int __kvm_set_memory_region(struct kvm
*kvm
,
729 struct kvm_userspace_memory_region
*mem
)
733 unsigned long npages
;
734 struct kvm_memory_slot
*slot
;
735 struct kvm_memory_slot old
, new;
736 struct kvm_memslots
*slots
= NULL
, *old_memslots
;
737 enum kvm_mr_change change
;
739 r
= check_memory_region_flags(mem
);
744 /* General sanity checks */
745 if (mem
->memory_size
& (PAGE_SIZE
- 1))
747 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
749 /* We can read the guest memory with __xxx_user() later on. */
750 if ((mem
->slot
< KVM_USER_MEM_SLOTS
) &&
751 ((mem
->userspace_addr
& (PAGE_SIZE
- 1)) ||
752 !access_ok(VERIFY_WRITE
,
753 (void __user
*)(unsigned long)mem
->userspace_addr
,
756 if (mem
->slot
>= KVM_MEM_SLOTS_NUM
)
758 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
761 slot
= id_to_memslot(kvm
->memslots
, mem
->slot
);
762 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
763 npages
= mem
->memory_size
>> PAGE_SHIFT
;
766 if (npages
> KVM_MEM_MAX_NR_PAGES
)
770 mem
->flags
&= ~KVM_MEM_LOG_DIRTY_PAGES
;
775 new.base_gfn
= base_gfn
;
777 new.flags
= mem
->flags
;
782 change
= KVM_MR_CREATE
;
783 else { /* Modify an existing slot. */
784 if ((mem
->userspace_addr
!= old
.userspace_addr
) ||
785 (npages
!= old
.npages
) ||
786 ((new.flags
^ old
.flags
) & KVM_MEM_READONLY
))
789 if (base_gfn
!= old
.base_gfn
)
790 change
= KVM_MR_MOVE
;
791 else if (new.flags
!= old
.flags
)
792 change
= KVM_MR_FLAGS_ONLY
;
793 else { /* Nothing to change. */
798 } else if (old
.npages
) {
799 change
= KVM_MR_DELETE
;
800 } else /* Modify a non-existent slot: disallowed. */
803 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
804 /* Check for overlaps */
806 kvm_for_each_memslot(slot
, kvm
->memslots
) {
807 if ((slot
->id
>= KVM_USER_MEM_SLOTS
) ||
808 (slot
->id
== mem
->slot
))
810 if (!((base_gfn
+ npages
<= slot
->base_gfn
) ||
811 (base_gfn
>= slot
->base_gfn
+ slot
->npages
)))
816 /* Free page dirty bitmap if unneeded */
817 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
818 new.dirty_bitmap
= NULL
;
821 if (change
== KVM_MR_CREATE
) {
822 new.userspace_addr
= mem
->userspace_addr
;
824 if (kvm_arch_create_memslot(&new, npages
))
828 /* Allocate page dirty bitmap if needed */
829 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
830 if (kvm_create_dirty_bitmap(&new) < 0)
834 if ((change
== KVM_MR_DELETE
) || (change
== KVM_MR_MOVE
)) {
836 slots
= kmemdup(kvm
->memslots
, sizeof(struct kvm_memslots
),
840 slot
= id_to_memslot(slots
, mem
->slot
);
841 slot
->flags
|= KVM_MEMSLOT_INVALID
;
843 old_memslots
= install_new_memslots(kvm
, slots
, NULL
);
845 /* slot was deleted or moved, clear iommu mapping */
846 kvm_iommu_unmap_pages(kvm
, &old
);
847 /* From this point no new shadow pages pointing to a deleted,
848 * or moved, memslot will be created.
850 * validation of sp->gfn happens in:
851 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
852 * - kvm_is_visible_gfn (mmu_check_roots)
854 kvm_arch_flush_shadow_memslot(kvm
, slot
);
855 slots
= old_memslots
;
858 r
= kvm_arch_prepare_memory_region(kvm
, &new, mem
, change
);
864 * We can re-use the old_memslots from above, the only difference
865 * from the currently installed memslots is the invalid flag. This
866 * will get overwritten by update_memslots anyway.
869 slots
= kmemdup(kvm
->memslots
, sizeof(struct kvm_memslots
),
876 * IOMMU mapping: New slots need to be mapped. Old slots need to be
877 * un-mapped and re-mapped if their base changes. Since base change
878 * unmapping is handled above with slot deletion, mapping alone is
879 * needed here. Anything else the iommu might care about for existing
880 * slots (size changes, userspace addr changes and read-only flag
881 * changes) is disallowed above, so any other attribute changes getting
882 * here can be skipped.
884 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
885 r
= kvm_iommu_map_pages(kvm
, &new);
890 /* actual memory is freed via old in kvm_free_physmem_slot below */
891 if (change
== KVM_MR_DELETE
) {
892 new.dirty_bitmap
= NULL
;
893 memset(&new.arch
, 0, sizeof(new.arch
));
896 old_memslots
= install_new_memslots(kvm
, slots
, &new);
898 kvm_arch_commit_memory_region(kvm
, mem
, &old
, change
);
900 kvm_free_physmem_slot(&old
, &new);
908 kvm_free_physmem_slot(&new, &old
);
912 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
914 int kvm_set_memory_region(struct kvm
*kvm
,
915 struct kvm_userspace_memory_region
*mem
)
919 mutex_lock(&kvm
->slots_lock
);
920 r
= __kvm_set_memory_region(kvm
, mem
);
921 mutex_unlock(&kvm
->slots_lock
);
924 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
926 int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
927 struct kvm_userspace_memory_region
*mem
)
929 if (mem
->slot
>= KVM_USER_MEM_SLOTS
)
931 return kvm_set_memory_region(kvm
, mem
);
934 int kvm_get_dirty_log(struct kvm
*kvm
,
935 struct kvm_dirty_log
*log
, int *is_dirty
)
937 struct kvm_memory_slot
*memslot
;
940 unsigned long any
= 0;
943 if (log
->slot
>= KVM_USER_MEM_SLOTS
)
946 memslot
= id_to_memslot(kvm
->memslots
, log
->slot
);
948 if (!memslot
->dirty_bitmap
)
951 n
= kvm_dirty_bitmap_bytes(memslot
);
953 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
954 any
= memslot
->dirty_bitmap
[i
];
957 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
968 bool kvm_largepages_enabled(void)
970 return largepages_enabled
;
973 void kvm_disable_largepages(void)
975 largepages_enabled
= false;
977 EXPORT_SYMBOL_GPL(kvm_disable_largepages
);
979 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
981 return __gfn_to_memslot(kvm_memslots(kvm
), gfn
);
983 EXPORT_SYMBOL_GPL(gfn_to_memslot
);
985 int kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
987 struct kvm_memory_slot
*memslot
= gfn_to_memslot(kvm
, gfn
);
989 if (!memslot
|| memslot
->id
>= KVM_USER_MEM_SLOTS
||
990 memslot
->flags
& KVM_MEMSLOT_INVALID
)
995 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
997 unsigned long kvm_host_page_size(struct kvm
*kvm
, gfn_t gfn
)
999 struct vm_area_struct
*vma
;
1000 unsigned long addr
, size
;
1004 addr
= gfn_to_hva(kvm
, gfn
);
1005 if (kvm_is_error_hva(addr
))
1008 down_read(¤t
->mm
->mmap_sem
);
1009 vma
= find_vma(current
->mm
, addr
);
1013 size
= vma_kernel_pagesize(vma
);
1016 up_read(¤t
->mm
->mmap_sem
);
1021 static bool memslot_is_readonly(struct kvm_memory_slot
*slot
)
1023 return slot
->flags
& KVM_MEM_READONLY
;
1026 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1027 gfn_t
*nr_pages
, bool write
)
1029 if (!slot
|| slot
->flags
& KVM_MEMSLOT_INVALID
)
1030 return KVM_HVA_ERR_BAD
;
1032 if (memslot_is_readonly(slot
) && write
)
1033 return KVM_HVA_ERR_RO_BAD
;
1036 *nr_pages
= slot
->npages
- (gfn
- slot
->base_gfn
);
1038 return __gfn_to_hva_memslot(slot
, gfn
);
1041 static unsigned long gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1044 return __gfn_to_hva_many(slot
, gfn
, nr_pages
, true);
1047 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot
*slot
,
1050 return gfn_to_hva_many(slot
, gfn
, NULL
);
1052 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot
);
1054 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
1056 return gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, NULL
);
1058 EXPORT_SYMBOL_GPL(gfn_to_hva
);
1061 * The hva returned by this function is only allowed to be read.
1062 * It should pair with kvm_read_hva() or kvm_read_hva_atomic().
1064 static unsigned long gfn_to_hva_read(struct kvm
*kvm
, gfn_t gfn
)
1066 return __gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, NULL
, false);
1069 static int kvm_read_hva(void *data
, void __user
*hva
, int len
)
1071 return __copy_from_user(data
, hva
, len
);
1074 static int kvm_read_hva_atomic(void *data
, void __user
*hva
, int len
)
1076 return __copy_from_user_inatomic(data
, hva
, len
);
1079 static int get_user_page_nowait(struct task_struct
*tsk
, struct mm_struct
*mm
,
1080 unsigned long start
, int write
, struct page
**page
)
1082 int flags
= FOLL_TOUCH
| FOLL_NOWAIT
| FOLL_HWPOISON
| FOLL_GET
;
1085 flags
|= FOLL_WRITE
;
1087 return __get_user_pages(tsk
, mm
, start
, 1, flags
, page
, NULL
, NULL
);
1090 static inline int check_user_page_hwpoison(unsigned long addr
)
1092 int rc
, flags
= FOLL_TOUCH
| FOLL_HWPOISON
| FOLL_WRITE
;
1094 rc
= __get_user_pages(current
, current
->mm
, addr
, 1,
1095 flags
, NULL
, NULL
, NULL
);
1096 return rc
== -EHWPOISON
;
1100 * The atomic path to get the writable pfn which will be stored in @pfn,
1101 * true indicates success, otherwise false is returned.
1103 static bool hva_to_pfn_fast(unsigned long addr
, bool atomic
, bool *async
,
1104 bool write_fault
, bool *writable
, pfn_t
*pfn
)
1106 struct page
*page
[1];
1109 if (!(async
|| atomic
))
1113 * Fast pin a writable pfn only if it is a write fault request
1114 * or the caller allows to map a writable pfn for a read fault
1117 if (!(write_fault
|| writable
))
1120 npages
= __get_user_pages_fast(addr
, 1, 1, page
);
1122 *pfn
= page_to_pfn(page
[0]);
1133 * The slow path to get the pfn of the specified host virtual address,
1134 * 1 indicates success, -errno is returned if error is detected.
1136 static int hva_to_pfn_slow(unsigned long addr
, bool *async
, bool write_fault
,
1137 bool *writable
, pfn_t
*pfn
)
1139 struct page
*page
[1];
1145 *writable
= write_fault
;
1148 down_read(¤t
->mm
->mmap_sem
);
1149 npages
= get_user_page_nowait(current
, current
->mm
,
1150 addr
, write_fault
, page
);
1151 up_read(¤t
->mm
->mmap_sem
);
1153 npages
= get_user_pages_fast(addr
, 1, write_fault
,
1158 /* map read fault as writable if possible */
1159 if (unlikely(!write_fault
) && writable
) {
1160 struct page
*wpage
[1];
1162 npages
= __get_user_pages_fast(addr
, 1, 1, wpage
);
1171 *pfn
= page_to_pfn(page
[0]);
1175 static bool vma_is_valid(struct vm_area_struct
*vma
, bool write_fault
)
1177 if (unlikely(!(vma
->vm_flags
& VM_READ
)))
1180 if (write_fault
&& (unlikely(!(vma
->vm_flags
& VM_WRITE
))))
1187 * Pin guest page in memory and return its pfn.
1188 * @addr: host virtual address which maps memory to the guest
1189 * @atomic: whether this function can sleep
1190 * @async: whether this function need to wait IO complete if the
1191 * host page is not in the memory
1192 * @write_fault: whether we should get a writable host page
1193 * @writable: whether it allows to map a writable host page for !@write_fault
1195 * The function will map a writable host page for these two cases:
1196 * 1): @write_fault = true
1197 * 2): @write_fault = false && @writable, @writable will tell the caller
1198 * whether the mapping is writable.
1200 static pfn_t
hva_to_pfn(unsigned long addr
, bool atomic
, bool *async
,
1201 bool write_fault
, bool *writable
)
1203 struct vm_area_struct
*vma
;
1207 /* we can do it either atomically or asynchronously, not both */
1208 BUG_ON(atomic
&& async
);
1210 if (hva_to_pfn_fast(addr
, atomic
, async
, write_fault
, writable
, &pfn
))
1214 return KVM_PFN_ERR_FAULT
;
1216 npages
= hva_to_pfn_slow(addr
, async
, write_fault
, writable
, &pfn
);
1220 down_read(¤t
->mm
->mmap_sem
);
1221 if (npages
== -EHWPOISON
||
1222 (!async
&& check_user_page_hwpoison(addr
))) {
1223 pfn
= KVM_PFN_ERR_HWPOISON
;
1227 vma
= find_vma_intersection(current
->mm
, addr
, addr
+ 1);
1230 pfn
= KVM_PFN_ERR_FAULT
;
1231 else if ((vma
->vm_flags
& VM_PFNMAP
)) {
1232 pfn
= ((addr
- vma
->vm_start
) >> PAGE_SHIFT
) +
1234 BUG_ON(!kvm_is_mmio_pfn(pfn
));
1236 if (async
&& vma_is_valid(vma
, write_fault
))
1238 pfn
= KVM_PFN_ERR_FAULT
;
1241 up_read(¤t
->mm
->mmap_sem
);
1246 __gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
, bool atomic
,
1247 bool *async
, bool write_fault
, bool *writable
)
1249 unsigned long addr
= __gfn_to_hva_many(slot
, gfn
, NULL
, write_fault
);
1251 if (addr
== KVM_HVA_ERR_RO_BAD
)
1252 return KVM_PFN_ERR_RO_FAULT
;
1254 if (kvm_is_error_hva(addr
))
1255 return KVM_PFN_NOSLOT
;
1257 /* Do not map writable pfn in the readonly memslot. */
1258 if (writable
&& memslot_is_readonly(slot
)) {
1263 return hva_to_pfn(addr
, atomic
, async
, write_fault
,
1267 static pfn_t
__gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
, bool atomic
, bool *async
,
1268 bool write_fault
, bool *writable
)
1270 struct kvm_memory_slot
*slot
;
1275 slot
= gfn_to_memslot(kvm
, gfn
);
1277 return __gfn_to_pfn_memslot(slot
, gfn
, atomic
, async
, write_fault
,
1281 pfn_t
gfn_to_pfn_atomic(struct kvm
*kvm
, gfn_t gfn
)
1283 return __gfn_to_pfn(kvm
, gfn
, true, NULL
, true, NULL
);
1285 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic
);
1287 pfn_t
gfn_to_pfn_async(struct kvm
*kvm
, gfn_t gfn
, bool *async
,
1288 bool write_fault
, bool *writable
)
1290 return __gfn_to_pfn(kvm
, gfn
, false, async
, write_fault
, writable
);
1292 EXPORT_SYMBOL_GPL(gfn_to_pfn_async
);
1294 pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
1296 return __gfn_to_pfn(kvm
, gfn
, false, NULL
, true, NULL
);
1298 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
1300 pfn_t
gfn_to_pfn_prot(struct kvm
*kvm
, gfn_t gfn
, bool write_fault
,
1303 return __gfn_to_pfn(kvm
, gfn
, false, NULL
, write_fault
, writable
);
1305 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot
);
1307 pfn_t
gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1309 return __gfn_to_pfn_memslot(slot
, gfn
, false, NULL
, true, NULL
);
1312 pfn_t
gfn_to_pfn_memslot_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1314 return __gfn_to_pfn_memslot(slot
, gfn
, true, NULL
, true, NULL
);
1316 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic
);
1318 int gfn_to_page_many_atomic(struct kvm
*kvm
, gfn_t gfn
, struct page
**pages
,
1324 addr
= gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, &entry
);
1325 if (kvm_is_error_hva(addr
))
1328 if (entry
< nr_pages
)
1331 return __get_user_pages_fast(addr
, nr_pages
, 1, pages
);
1333 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic
);
1335 static struct page
*kvm_pfn_to_page(pfn_t pfn
)
1337 if (is_error_noslot_pfn(pfn
))
1338 return KVM_ERR_PTR_BAD_PAGE
;
1340 if (kvm_is_mmio_pfn(pfn
)) {
1342 return KVM_ERR_PTR_BAD_PAGE
;
1345 return pfn_to_page(pfn
);
1348 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
1352 pfn
= gfn_to_pfn(kvm
, gfn
);
1354 return kvm_pfn_to_page(pfn
);
1357 EXPORT_SYMBOL_GPL(gfn_to_page
);
1359 void kvm_release_page_clean(struct page
*page
)
1361 WARN_ON(is_error_page(page
));
1363 kvm_release_pfn_clean(page_to_pfn(page
));
1365 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1367 void kvm_release_pfn_clean(pfn_t pfn
)
1369 if (!is_error_noslot_pfn(pfn
) && !kvm_is_mmio_pfn(pfn
))
1370 put_page(pfn_to_page(pfn
));
1372 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1374 void kvm_release_page_dirty(struct page
*page
)
1376 WARN_ON(is_error_page(page
));
1378 kvm_release_pfn_dirty(page_to_pfn(page
));
1380 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1382 void kvm_release_pfn_dirty(pfn_t pfn
)
1384 kvm_set_pfn_dirty(pfn
);
1385 kvm_release_pfn_clean(pfn
);
1387 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty
);
1389 void kvm_set_page_dirty(struct page
*page
)
1391 kvm_set_pfn_dirty(page_to_pfn(page
));
1393 EXPORT_SYMBOL_GPL(kvm_set_page_dirty
);
1395 void kvm_set_pfn_dirty(pfn_t pfn
)
1397 if (!kvm_is_mmio_pfn(pfn
)) {
1398 struct page
*page
= pfn_to_page(pfn
);
1399 if (!PageReserved(page
))
1403 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1405 void kvm_set_pfn_accessed(pfn_t pfn
)
1407 if (!kvm_is_mmio_pfn(pfn
))
1408 mark_page_accessed(pfn_to_page(pfn
));
1410 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1412 void kvm_get_pfn(pfn_t pfn
)
1414 if (!kvm_is_mmio_pfn(pfn
))
1415 get_page(pfn_to_page(pfn
));
1417 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1419 static int next_segment(unsigned long len
, int offset
)
1421 if (len
> PAGE_SIZE
- offset
)
1422 return PAGE_SIZE
- offset
;
1427 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1433 addr
= gfn_to_hva_read(kvm
, gfn
);
1434 if (kvm_is_error_hva(addr
))
1436 r
= kvm_read_hva(data
, (void __user
*)addr
+ offset
, len
);
1441 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1443 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1445 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1447 int offset
= offset_in_page(gpa
);
1450 while ((seg
= next_segment(len
, offset
)) != 0) {
1451 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
1461 EXPORT_SYMBOL_GPL(kvm_read_guest
);
1463 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
1468 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1469 int offset
= offset_in_page(gpa
);
1471 addr
= gfn_to_hva_read(kvm
, gfn
);
1472 if (kvm_is_error_hva(addr
))
1474 pagefault_disable();
1475 r
= kvm_read_hva_atomic(data
, (void __user
*)addr
+ offset
, len
);
1481 EXPORT_SYMBOL(kvm_read_guest_atomic
);
1483 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
, const void *data
,
1484 int offset
, int len
)
1489 addr
= gfn_to_hva(kvm
, gfn
);
1490 if (kvm_is_error_hva(addr
))
1492 r
= __copy_to_user((void __user
*)addr
+ offset
, data
, len
);
1495 mark_page_dirty(kvm
, gfn
);
1498 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
1500 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
1503 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1505 int offset
= offset_in_page(gpa
);
1508 while ((seg
= next_segment(len
, offset
)) != 0) {
1509 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
1520 int kvm_gfn_to_hva_cache_init(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1521 gpa_t gpa
, unsigned long len
)
1523 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1524 int offset
= offset_in_page(gpa
);
1525 gfn_t start_gfn
= gpa
>> PAGE_SHIFT
;
1526 gfn_t end_gfn
= (gpa
+ len
- 1) >> PAGE_SHIFT
;
1527 gfn_t nr_pages_needed
= end_gfn
- start_gfn
+ 1;
1528 gfn_t nr_pages_avail
;
1531 ghc
->generation
= slots
->generation
;
1533 ghc
->memslot
= gfn_to_memslot(kvm
, start_gfn
);
1534 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
, &nr_pages_avail
);
1535 if (!kvm_is_error_hva(ghc
->hva
) && nr_pages_avail
>= nr_pages_needed
) {
1539 * If the requested region crosses two memslots, we still
1540 * verify that the entire region is valid here.
1542 while (start_gfn
<= end_gfn
) {
1543 ghc
->memslot
= gfn_to_memslot(kvm
, start_gfn
);
1544 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
,
1546 if (kvm_is_error_hva(ghc
->hva
))
1548 start_gfn
+= nr_pages_avail
;
1550 /* Use the slow path for cross page reads and writes. */
1551 ghc
->memslot
= NULL
;
1555 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init
);
1557 int kvm_write_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1558 void *data
, unsigned long len
)
1560 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1563 BUG_ON(len
> ghc
->len
);
1565 if (slots
->generation
!= ghc
->generation
)
1566 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
, ghc
->len
);
1568 if (unlikely(!ghc
->memslot
))
1569 return kvm_write_guest(kvm
, ghc
->gpa
, data
, len
);
1571 if (kvm_is_error_hva(ghc
->hva
))
1574 r
= __copy_to_user((void __user
*)ghc
->hva
, data
, len
);
1577 mark_page_dirty_in_slot(kvm
, ghc
->memslot
, ghc
->gpa
>> PAGE_SHIFT
);
1581 EXPORT_SYMBOL_GPL(kvm_write_guest_cached
);
1583 int kvm_read_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1584 void *data
, unsigned long len
)
1586 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1589 BUG_ON(len
> ghc
->len
);
1591 if (slots
->generation
!= ghc
->generation
)
1592 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
, ghc
->len
);
1594 if (unlikely(!ghc
->memslot
))
1595 return kvm_read_guest(kvm
, ghc
->gpa
, data
, len
);
1597 if (kvm_is_error_hva(ghc
->hva
))
1600 r
= __copy_from_user(data
, (void __user
*)ghc
->hva
, len
);
1606 EXPORT_SYMBOL_GPL(kvm_read_guest_cached
);
1608 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
1610 return kvm_write_guest_page(kvm
, gfn
, (const void *) empty_zero_page
,
1613 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
1615 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
1617 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1619 int offset
= offset_in_page(gpa
);
1622 while ((seg
= next_segment(len
, offset
)) != 0) {
1623 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
1632 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
1634 void mark_page_dirty_in_slot(struct kvm
*kvm
, struct kvm_memory_slot
*memslot
,
1637 if (memslot
&& memslot
->dirty_bitmap
) {
1638 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
1640 set_bit_le(rel_gfn
, memslot
->dirty_bitmap
);
1644 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
1646 struct kvm_memory_slot
*memslot
;
1648 memslot
= gfn_to_memslot(kvm
, gfn
);
1649 mark_page_dirty_in_slot(kvm
, memslot
, gfn
);
1653 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1655 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
1660 prepare_to_wait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
1662 if (kvm_arch_vcpu_runnable(vcpu
)) {
1663 kvm_make_request(KVM_REQ_UNHALT
, vcpu
);
1666 if (kvm_cpu_has_pending_timer(vcpu
))
1668 if (signal_pending(current
))
1674 finish_wait(&vcpu
->wq
, &wait
);
1679 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
1681 void kvm_vcpu_kick(struct kvm_vcpu
*vcpu
)
1684 int cpu
= vcpu
->cpu
;
1685 wait_queue_head_t
*wqp
;
1687 wqp
= kvm_arch_vcpu_wq(vcpu
);
1688 if (waitqueue_active(wqp
)) {
1689 wake_up_interruptible(wqp
);
1690 ++vcpu
->stat
.halt_wakeup
;
1694 if (cpu
!= me
&& (unsigned)cpu
< nr_cpu_ids
&& cpu_online(cpu
))
1695 if (kvm_arch_vcpu_should_kick(vcpu
))
1696 smp_send_reschedule(cpu
);
1699 EXPORT_SYMBOL_GPL(kvm_vcpu_kick
);
1700 #endif /* !CONFIG_S390 */
1702 void kvm_resched(struct kvm_vcpu
*vcpu
)
1704 if (!need_resched())
1708 EXPORT_SYMBOL_GPL(kvm_resched
);
1710 bool kvm_vcpu_yield_to(struct kvm_vcpu
*target
)
1713 struct task_struct
*task
= NULL
;
1717 pid
= rcu_dereference(target
->pid
);
1719 task
= get_pid_task(target
->pid
, PIDTYPE_PID
);
1723 if (task
->flags
& PF_VCPU
) {
1724 put_task_struct(task
);
1727 ret
= yield_to(task
, 1);
1728 put_task_struct(task
);
1732 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to
);
1734 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
1736 * Helper that checks whether a VCPU is eligible for directed yield.
1737 * Most eligible candidate to yield is decided by following heuristics:
1739 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
1740 * (preempted lock holder), indicated by @in_spin_loop.
1741 * Set at the beiginning and cleared at the end of interception/PLE handler.
1743 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
1744 * chance last time (mostly it has become eligible now since we have probably
1745 * yielded to lockholder in last iteration. This is done by toggling
1746 * @dy_eligible each time a VCPU checked for eligibility.)
1748 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
1749 * to preempted lock-holder could result in wrong VCPU selection and CPU
1750 * burning. Giving priority for a potential lock-holder increases lock
1753 * Since algorithm is based on heuristics, accessing another VCPU data without
1754 * locking does not harm. It may result in trying to yield to same VCPU, fail
1755 * and continue with next VCPU and so on.
1757 bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu
*vcpu
)
1761 eligible
= !vcpu
->spin_loop
.in_spin_loop
||
1762 (vcpu
->spin_loop
.in_spin_loop
&&
1763 vcpu
->spin_loop
.dy_eligible
);
1765 if (vcpu
->spin_loop
.in_spin_loop
)
1766 kvm_vcpu_set_dy_eligible(vcpu
, !vcpu
->spin_loop
.dy_eligible
);
1772 void kvm_vcpu_on_spin(struct kvm_vcpu
*me
)
1774 struct kvm
*kvm
= me
->kvm
;
1775 struct kvm_vcpu
*vcpu
;
1776 int last_boosted_vcpu
= me
->kvm
->last_boosted_vcpu
;
1782 kvm_vcpu_set_in_spin_loop(me
, true);
1784 * We boost the priority of a VCPU that is runnable but not
1785 * currently running, because it got preempted by something
1786 * else and called schedule in __vcpu_run. Hopefully that
1787 * VCPU is holding the lock that we need and will release it.
1788 * We approximate round-robin by starting at the last boosted VCPU.
1790 for (pass
= 0; pass
< 2 && !yielded
&& try; pass
++) {
1791 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
1792 if (!pass
&& i
<= last_boosted_vcpu
) {
1793 i
= last_boosted_vcpu
;
1795 } else if (pass
&& i
> last_boosted_vcpu
)
1797 if (!ACCESS_ONCE(vcpu
->preempted
))
1801 if (waitqueue_active(&vcpu
->wq
))
1803 if (!kvm_vcpu_eligible_for_directed_yield(vcpu
))
1806 yielded
= kvm_vcpu_yield_to(vcpu
);
1808 kvm
->last_boosted_vcpu
= i
;
1810 } else if (yielded
< 0) {
1817 kvm_vcpu_set_in_spin_loop(me
, false);
1819 /* Ensure vcpu is not eligible during next spinloop */
1820 kvm_vcpu_set_dy_eligible(me
, false);
1822 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin
);
1824 static int kvm_vcpu_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1826 struct kvm_vcpu
*vcpu
= vma
->vm_file
->private_data
;
1829 if (vmf
->pgoff
== 0)
1830 page
= virt_to_page(vcpu
->run
);
1832 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
1833 page
= virt_to_page(vcpu
->arch
.pio_data
);
1835 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1836 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
1837 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
1840 return kvm_arch_vcpu_fault(vcpu
, vmf
);
1846 static const struct vm_operations_struct kvm_vcpu_vm_ops
= {
1847 .fault
= kvm_vcpu_fault
,
1850 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1852 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
1856 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
1858 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1860 kvm_put_kvm(vcpu
->kvm
);
1864 static struct file_operations kvm_vcpu_fops
= {
1865 .release
= kvm_vcpu_release
,
1866 .unlocked_ioctl
= kvm_vcpu_ioctl
,
1867 #ifdef CONFIG_COMPAT
1868 .compat_ioctl
= kvm_vcpu_compat_ioctl
,
1870 .mmap
= kvm_vcpu_mmap
,
1871 .llseek
= noop_llseek
,
1875 * Allocates an inode for the vcpu.
1877 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
1879 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops
, vcpu
, O_RDWR
| O_CLOEXEC
);
1883 * Creates some virtual cpus. Good luck creating more than one.
1885 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, u32 id
)
1888 struct kvm_vcpu
*vcpu
, *v
;
1890 vcpu
= kvm_arch_vcpu_create(kvm
, id
);
1892 return PTR_ERR(vcpu
);
1894 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
1896 r
= kvm_arch_vcpu_setup(vcpu
);
1900 mutex_lock(&kvm
->lock
);
1901 if (!kvm_vcpu_compatible(vcpu
)) {
1903 goto unlock_vcpu_destroy
;
1905 if (atomic_read(&kvm
->online_vcpus
) == KVM_MAX_VCPUS
) {
1907 goto unlock_vcpu_destroy
;
1910 kvm_for_each_vcpu(r
, v
, kvm
)
1911 if (v
->vcpu_id
== id
) {
1913 goto unlock_vcpu_destroy
;
1916 BUG_ON(kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)]);
1918 /* Now it's all set up, let userspace reach it */
1920 r
= create_vcpu_fd(vcpu
);
1923 goto unlock_vcpu_destroy
;
1926 kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)] = vcpu
;
1928 atomic_inc(&kvm
->online_vcpus
);
1930 mutex_unlock(&kvm
->lock
);
1931 kvm_arch_vcpu_postcreate(vcpu
);
1934 unlock_vcpu_destroy
:
1935 mutex_unlock(&kvm
->lock
);
1937 kvm_arch_vcpu_destroy(vcpu
);
1941 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
1944 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
1945 vcpu
->sigset_active
= 1;
1946 vcpu
->sigset
= *sigset
;
1948 vcpu
->sigset_active
= 0;
1952 static long kvm_vcpu_ioctl(struct file
*filp
,
1953 unsigned int ioctl
, unsigned long arg
)
1955 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1956 void __user
*argp
= (void __user
*)arg
;
1958 struct kvm_fpu
*fpu
= NULL
;
1959 struct kvm_sregs
*kvm_sregs
= NULL
;
1961 if (vcpu
->kvm
->mm
!= current
->mm
)
1964 #if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS)
1966 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1967 * so vcpu_load() would break it.
1969 if (ioctl
== KVM_S390_INTERRUPT
|| ioctl
== KVM_INTERRUPT
)
1970 return kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
1974 r
= vcpu_load(vcpu
);
1982 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
1983 trace_kvm_userspace_exit(vcpu
->run
->exit_reason
, r
);
1985 case KVM_GET_REGS
: {
1986 struct kvm_regs
*kvm_regs
;
1989 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
1992 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
1996 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
2003 case KVM_SET_REGS
: {
2004 struct kvm_regs
*kvm_regs
;
2007 kvm_regs
= memdup_user(argp
, sizeof(*kvm_regs
));
2008 if (IS_ERR(kvm_regs
)) {
2009 r
= PTR_ERR(kvm_regs
);
2012 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
2016 case KVM_GET_SREGS
: {
2017 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
2021 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
2025 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
2030 case KVM_SET_SREGS
: {
2031 kvm_sregs
= memdup_user(argp
, sizeof(*kvm_sregs
));
2032 if (IS_ERR(kvm_sregs
)) {
2033 r
= PTR_ERR(kvm_sregs
);
2037 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
2040 case KVM_GET_MP_STATE
: {
2041 struct kvm_mp_state mp_state
;
2043 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
2047 if (copy_to_user(argp
, &mp_state
, sizeof mp_state
))
2052 case KVM_SET_MP_STATE
: {
2053 struct kvm_mp_state mp_state
;
2056 if (copy_from_user(&mp_state
, argp
, sizeof mp_state
))
2058 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
2061 case KVM_TRANSLATE
: {
2062 struct kvm_translation tr
;
2065 if (copy_from_user(&tr
, argp
, sizeof tr
))
2067 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
2071 if (copy_to_user(argp
, &tr
, sizeof tr
))
2076 case KVM_SET_GUEST_DEBUG
: {
2077 struct kvm_guest_debug dbg
;
2080 if (copy_from_user(&dbg
, argp
, sizeof dbg
))
2082 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
2085 case KVM_SET_SIGNAL_MASK
: {
2086 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2087 struct kvm_signal_mask kvm_sigmask
;
2088 sigset_t sigset
, *p
;
2093 if (copy_from_user(&kvm_sigmask
, argp
,
2094 sizeof kvm_sigmask
))
2097 if (kvm_sigmask
.len
!= sizeof sigset
)
2100 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
2105 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, p
);
2109 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
2113 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
2117 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
2123 fpu
= memdup_user(argp
, sizeof(*fpu
));
2129 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
2133 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2142 #ifdef CONFIG_COMPAT
2143 static long kvm_vcpu_compat_ioctl(struct file
*filp
,
2144 unsigned int ioctl
, unsigned long arg
)
2146 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2147 void __user
*argp
= compat_ptr(arg
);
2150 if (vcpu
->kvm
->mm
!= current
->mm
)
2154 case KVM_SET_SIGNAL_MASK
: {
2155 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2156 struct kvm_signal_mask kvm_sigmask
;
2157 compat_sigset_t csigset
;
2162 if (copy_from_user(&kvm_sigmask
, argp
,
2163 sizeof kvm_sigmask
))
2166 if (kvm_sigmask
.len
!= sizeof csigset
)
2169 if (copy_from_user(&csigset
, sigmask_arg
->sigset
,
2172 sigset_from_compat(&sigset
, &csigset
);
2173 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
2175 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, NULL
);
2179 r
= kvm_vcpu_ioctl(filp
, ioctl
, arg
);
2187 static int kvm_device_ioctl_attr(struct kvm_device
*dev
,
2188 int (*accessor
)(struct kvm_device
*dev
,
2189 struct kvm_device_attr
*attr
),
2192 struct kvm_device_attr attr
;
2197 if (copy_from_user(&attr
, (void __user
*)arg
, sizeof(attr
)))
2200 return accessor(dev
, &attr
);
2203 static long kvm_device_ioctl(struct file
*filp
, unsigned int ioctl
,
2206 struct kvm_device
*dev
= filp
->private_data
;
2209 case KVM_SET_DEVICE_ATTR
:
2210 return kvm_device_ioctl_attr(dev
, dev
->ops
->set_attr
, arg
);
2211 case KVM_GET_DEVICE_ATTR
:
2212 return kvm_device_ioctl_attr(dev
, dev
->ops
->get_attr
, arg
);
2213 case KVM_HAS_DEVICE_ATTR
:
2214 return kvm_device_ioctl_attr(dev
, dev
->ops
->has_attr
, arg
);
2216 if (dev
->ops
->ioctl
)
2217 return dev
->ops
->ioctl(dev
, ioctl
, arg
);
2223 static int kvm_device_release(struct inode
*inode
, struct file
*filp
)
2225 struct kvm_device
*dev
= filp
->private_data
;
2226 struct kvm
*kvm
= dev
->kvm
;
2232 static const struct file_operations kvm_device_fops
= {
2233 .unlocked_ioctl
= kvm_device_ioctl
,
2234 #ifdef CONFIG_COMPAT
2235 .compat_ioctl
= kvm_device_ioctl
,
2237 .release
= kvm_device_release
,
2240 struct kvm_device
*kvm_device_from_filp(struct file
*filp
)
2242 if (filp
->f_op
!= &kvm_device_fops
)
2245 return filp
->private_data
;
2248 static int kvm_ioctl_create_device(struct kvm
*kvm
,
2249 struct kvm_create_device
*cd
)
2251 struct kvm_device_ops
*ops
= NULL
;
2252 struct kvm_device
*dev
;
2253 bool test
= cd
->flags
& KVM_CREATE_DEVICE_TEST
;
2257 #ifdef CONFIG_KVM_MPIC
2258 case KVM_DEV_TYPE_FSL_MPIC_20
:
2259 case KVM_DEV_TYPE_FSL_MPIC_42
:
2260 ops
= &kvm_mpic_ops
;
2263 #ifdef CONFIG_KVM_XICS
2264 case KVM_DEV_TYPE_XICS
:
2265 ops
= &kvm_xics_ops
;
2275 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
2282 ret
= ops
->create(dev
, cd
->type
);
2288 ret
= anon_inode_getfd(ops
->name
, &kvm_device_fops
, dev
, O_RDWR
| O_CLOEXEC
);
2294 list_add(&dev
->vm_node
, &kvm
->devices
);
2300 static long kvm_vm_ioctl(struct file
*filp
,
2301 unsigned int ioctl
, unsigned long arg
)
2303 struct kvm
*kvm
= filp
->private_data
;
2304 void __user
*argp
= (void __user
*)arg
;
2307 if (kvm
->mm
!= current
->mm
)
2310 case KVM_CREATE_VCPU
:
2311 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
2313 case KVM_SET_USER_MEMORY_REGION
: {
2314 struct kvm_userspace_memory_region kvm_userspace_mem
;
2317 if (copy_from_user(&kvm_userspace_mem
, argp
,
2318 sizeof kvm_userspace_mem
))
2321 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
);
2324 case KVM_GET_DIRTY_LOG
: {
2325 struct kvm_dirty_log log
;
2328 if (copy_from_user(&log
, argp
, sizeof log
))
2330 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2333 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2334 case KVM_REGISTER_COALESCED_MMIO
: {
2335 struct kvm_coalesced_mmio_zone zone
;
2337 if (copy_from_user(&zone
, argp
, sizeof zone
))
2339 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
2342 case KVM_UNREGISTER_COALESCED_MMIO
: {
2343 struct kvm_coalesced_mmio_zone zone
;
2345 if (copy_from_user(&zone
, argp
, sizeof zone
))
2347 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
2352 struct kvm_irqfd data
;
2355 if (copy_from_user(&data
, argp
, sizeof data
))
2357 r
= kvm_irqfd(kvm
, &data
);
2360 case KVM_IOEVENTFD
: {
2361 struct kvm_ioeventfd data
;
2364 if (copy_from_user(&data
, argp
, sizeof data
))
2366 r
= kvm_ioeventfd(kvm
, &data
);
2369 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2370 case KVM_SET_BOOT_CPU_ID
:
2372 mutex_lock(&kvm
->lock
);
2373 if (atomic_read(&kvm
->online_vcpus
) != 0)
2376 kvm
->bsp_vcpu_id
= arg
;
2377 mutex_unlock(&kvm
->lock
);
2380 #ifdef CONFIG_HAVE_KVM_MSI
2381 case KVM_SIGNAL_MSI
: {
2385 if (copy_from_user(&msi
, argp
, sizeof msi
))
2387 r
= kvm_send_userspace_msi(kvm
, &msi
);
2391 #ifdef __KVM_HAVE_IRQ_LINE
2392 case KVM_IRQ_LINE_STATUS
:
2393 case KVM_IRQ_LINE
: {
2394 struct kvm_irq_level irq_event
;
2397 if (copy_from_user(&irq_event
, argp
, sizeof irq_event
))
2400 r
= kvm_vm_ioctl_irq_line(kvm
, &irq_event
,
2401 ioctl
== KVM_IRQ_LINE_STATUS
);
2406 if (ioctl
== KVM_IRQ_LINE_STATUS
) {
2407 if (copy_to_user(argp
, &irq_event
, sizeof irq_event
))
2415 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2416 case KVM_SET_GSI_ROUTING
: {
2417 struct kvm_irq_routing routing
;
2418 struct kvm_irq_routing __user
*urouting
;
2419 struct kvm_irq_routing_entry
*entries
;
2422 if (copy_from_user(&routing
, argp
, sizeof(routing
)))
2425 if (routing
.nr
>= KVM_MAX_IRQ_ROUTES
)
2430 entries
= vmalloc(routing
.nr
* sizeof(*entries
));
2435 if (copy_from_user(entries
, urouting
->entries
,
2436 routing
.nr
* sizeof(*entries
)))
2437 goto out_free_irq_routing
;
2438 r
= kvm_set_irq_routing(kvm
, entries
, routing
.nr
,
2440 out_free_irq_routing
:
2444 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
2445 case KVM_CREATE_DEVICE
: {
2446 struct kvm_create_device cd
;
2449 if (copy_from_user(&cd
, argp
, sizeof(cd
)))
2452 r
= kvm_ioctl_create_device(kvm
, &cd
);
2457 if (copy_to_user(argp
, &cd
, sizeof(cd
)))
2464 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
2466 r
= kvm_vm_ioctl_assigned_device(kvm
, ioctl
, arg
);
2472 #ifdef CONFIG_COMPAT
2473 struct compat_kvm_dirty_log
{
2477 compat_uptr_t dirty_bitmap
; /* one bit per page */
2482 static long kvm_vm_compat_ioctl(struct file
*filp
,
2483 unsigned int ioctl
, unsigned long arg
)
2485 struct kvm
*kvm
= filp
->private_data
;
2488 if (kvm
->mm
!= current
->mm
)
2491 case KVM_GET_DIRTY_LOG
: {
2492 struct compat_kvm_dirty_log compat_log
;
2493 struct kvm_dirty_log log
;
2496 if (copy_from_user(&compat_log
, (void __user
*)arg
,
2497 sizeof(compat_log
)))
2499 log
.slot
= compat_log
.slot
;
2500 log
.padding1
= compat_log
.padding1
;
2501 log
.padding2
= compat_log
.padding2
;
2502 log
.dirty_bitmap
= compat_ptr(compat_log
.dirty_bitmap
);
2504 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2508 r
= kvm_vm_ioctl(filp
, ioctl
, arg
);
2516 static int kvm_vm_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
2518 struct page
*page
[1];
2521 gfn_t gfn
= vmf
->pgoff
;
2522 struct kvm
*kvm
= vma
->vm_file
->private_data
;
2524 addr
= gfn_to_hva(kvm
, gfn
);
2525 if (kvm_is_error_hva(addr
))
2526 return VM_FAULT_SIGBUS
;
2528 npages
= get_user_pages(current
, current
->mm
, addr
, 1, 1, 0, page
,
2530 if (unlikely(npages
!= 1))
2531 return VM_FAULT_SIGBUS
;
2533 vmf
->page
= page
[0];
2537 static const struct vm_operations_struct kvm_vm_vm_ops
= {
2538 .fault
= kvm_vm_fault
,
2541 static int kvm_vm_mmap(struct file
*file
, struct vm_area_struct
*vma
)
2543 vma
->vm_ops
= &kvm_vm_vm_ops
;
2547 static struct file_operations kvm_vm_fops
= {
2548 .release
= kvm_vm_release
,
2549 .unlocked_ioctl
= kvm_vm_ioctl
,
2550 #ifdef CONFIG_COMPAT
2551 .compat_ioctl
= kvm_vm_compat_ioctl
,
2553 .mmap
= kvm_vm_mmap
,
2554 .llseek
= noop_llseek
,
2557 static int kvm_dev_ioctl_create_vm(unsigned long type
)
2562 kvm
= kvm_create_vm(type
);
2564 return PTR_ERR(kvm
);
2565 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2566 r
= kvm_coalesced_mmio_init(kvm
);
2572 r
= anon_inode_getfd("kvm-vm", &kvm_vm_fops
, kvm
, O_RDWR
| O_CLOEXEC
);
2579 static long kvm_dev_ioctl_check_extension_generic(long arg
)
2582 case KVM_CAP_USER_MEMORY
:
2583 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
2584 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
2585 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2586 case KVM_CAP_SET_BOOT_CPU_ID
:
2588 case KVM_CAP_INTERNAL_ERROR_DATA
:
2589 #ifdef CONFIG_HAVE_KVM_MSI
2590 case KVM_CAP_SIGNAL_MSI
:
2592 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2593 case KVM_CAP_IRQFD_RESAMPLE
:
2596 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2597 case KVM_CAP_IRQ_ROUTING
:
2598 return KVM_MAX_IRQ_ROUTES
;
2603 return kvm_dev_ioctl_check_extension(arg
);
2606 static long kvm_dev_ioctl(struct file
*filp
,
2607 unsigned int ioctl
, unsigned long arg
)
2612 case KVM_GET_API_VERSION
:
2616 r
= KVM_API_VERSION
;
2619 r
= kvm_dev_ioctl_create_vm(arg
);
2621 case KVM_CHECK_EXTENSION
:
2622 r
= kvm_dev_ioctl_check_extension_generic(arg
);
2624 case KVM_GET_VCPU_MMAP_SIZE
:
2628 r
= PAGE_SIZE
; /* struct kvm_run */
2630 r
+= PAGE_SIZE
; /* pio data page */
2632 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2633 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
2636 case KVM_TRACE_ENABLE
:
2637 case KVM_TRACE_PAUSE
:
2638 case KVM_TRACE_DISABLE
:
2642 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
2648 static struct file_operations kvm_chardev_ops
= {
2649 .unlocked_ioctl
= kvm_dev_ioctl
,
2650 .compat_ioctl
= kvm_dev_ioctl
,
2651 .llseek
= noop_llseek
,
2654 static struct miscdevice kvm_dev
= {
2660 static void hardware_enable_nolock(void *junk
)
2662 int cpu
= raw_smp_processor_id();
2665 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2668 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
2670 r
= kvm_arch_hardware_enable(NULL
);
2673 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2674 atomic_inc(&hardware_enable_failed
);
2675 printk(KERN_INFO
"kvm: enabling virtualization on "
2676 "CPU%d failed\n", cpu
);
2680 static void hardware_enable(void *junk
)
2682 raw_spin_lock(&kvm_lock
);
2683 hardware_enable_nolock(junk
);
2684 raw_spin_unlock(&kvm_lock
);
2687 static void hardware_disable_nolock(void *junk
)
2689 int cpu
= raw_smp_processor_id();
2691 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2693 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2694 kvm_arch_hardware_disable(NULL
);
2697 static void hardware_disable(void *junk
)
2699 raw_spin_lock(&kvm_lock
);
2700 hardware_disable_nolock(junk
);
2701 raw_spin_unlock(&kvm_lock
);
2704 static void hardware_disable_all_nolock(void)
2706 BUG_ON(!kvm_usage_count
);
2709 if (!kvm_usage_count
)
2710 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2713 static void hardware_disable_all(void)
2715 raw_spin_lock(&kvm_lock
);
2716 hardware_disable_all_nolock();
2717 raw_spin_unlock(&kvm_lock
);
2720 static int hardware_enable_all(void)
2724 raw_spin_lock(&kvm_lock
);
2727 if (kvm_usage_count
== 1) {
2728 atomic_set(&hardware_enable_failed
, 0);
2729 on_each_cpu(hardware_enable_nolock
, NULL
, 1);
2731 if (atomic_read(&hardware_enable_failed
)) {
2732 hardware_disable_all_nolock();
2737 raw_spin_unlock(&kvm_lock
);
2742 static int kvm_cpu_hotplug(struct notifier_block
*notifier
, unsigned long val
,
2747 if (!kvm_usage_count
)
2750 val
&= ~CPU_TASKS_FROZEN
;
2753 printk(KERN_INFO
"kvm: disabling virtualization on CPU%d\n",
2755 hardware_disable(NULL
);
2758 printk(KERN_INFO
"kvm: enabling virtualization on CPU%d\n",
2760 hardware_enable(NULL
);
2766 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
2770 * Some (well, at least mine) BIOSes hang on reboot if
2773 * And Intel TXT required VMX off for all cpu when system shutdown.
2775 printk(KERN_INFO
"kvm: exiting hardware virtualization\n");
2776 kvm_rebooting
= true;
2777 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2781 static struct notifier_block kvm_reboot_notifier
= {
2782 .notifier_call
= kvm_reboot
,
2786 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
2790 for (i
= 0; i
< bus
->dev_count
; i
++) {
2791 struct kvm_io_device
*pos
= bus
->range
[i
].dev
;
2793 kvm_iodevice_destructor(pos
);
2798 static inline int kvm_io_bus_cmp(const struct kvm_io_range
*r1
,
2799 const struct kvm_io_range
*r2
)
2801 if (r1
->addr
< r2
->addr
)
2803 if (r1
->addr
+ r1
->len
> r2
->addr
+ r2
->len
)
2808 static int kvm_io_bus_sort_cmp(const void *p1
, const void *p2
)
2810 return kvm_io_bus_cmp(p1
, p2
);
2813 static int kvm_io_bus_insert_dev(struct kvm_io_bus
*bus
, struct kvm_io_device
*dev
,
2814 gpa_t addr
, int len
)
2816 bus
->range
[bus
->dev_count
++] = (struct kvm_io_range
) {
2822 sort(bus
->range
, bus
->dev_count
, sizeof(struct kvm_io_range
),
2823 kvm_io_bus_sort_cmp
, NULL
);
2828 static int kvm_io_bus_get_first_dev(struct kvm_io_bus
*bus
,
2829 gpa_t addr
, int len
)
2831 struct kvm_io_range
*range
, key
;
2834 key
= (struct kvm_io_range
) {
2839 range
= bsearch(&key
, bus
->range
, bus
->dev_count
,
2840 sizeof(struct kvm_io_range
), kvm_io_bus_sort_cmp
);
2844 off
= range
- bus
->range
;
2846 while (off
> 0 && kvm_io_bus_cmp(&key
, &bus
->range
[off
-1]) == 0)
2852 static int __kvm_io_bus_write(struct kvm_io_bus
*bus
,
2853 struct kvm_io_range
*range
, const void *val
)
2857 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
2861 while (idx
< bus
->dev_count
&&
2862 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
2863 if (!kvm_iodevice_write(bus
->range
[idx
].dev
, range
->addr
,
2872 /* kvm_io_bus_write - called under kvm->slots_lock */
2873 int kvm_io_bus_write(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2874 int len
, const void *val
)
2876 struct kvm_io_bus
*bus
;
2877 struct kvm_io_range range
;
2880 range
= (struct kvm_io_range
) {
2885 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2886 r
= __kvm_io_bus_write(bus
, &range
, val
);
2887 return r
< 0 ? r
: 0;
2890 /* kvm_io_bus_write_cookie - called under kvm->slots_lock */
2891 int kvm_io_bus_write_cookie(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2892 int len
, const void *val
, long cookie
)
2894 struct kvm_io_bus
*bus
;
2895 struct kvm_io_range range
;
2897 range
= (struct kvm_io_range
) {
2902 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2904 /* First try the device referenced by cookie. */
2905 if ((cookie
>= 0) && (cookie
< bus
->dev_count
) &&
2906 (kvm_io_bus_cmp(&range
, &bus
->range
[cookie
]) == 0))
2907 if (!kvm_iodevice_write(bus
->range
[cookie
].dev
, addr
, len
,
2912 * cookie contained garbage; fall back to search and return the
2913 * correct cookie value.
2915 return __kvm_io_bus_write(bus
, &range
, val
);
2918 static int __kvm_io_bus_read(struct kvm_io_bus
*bus
, struct kvm_io_range
*range
,
2923 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
2927 while (idx
< bus
->dev_count
&&
2928 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
2929 if (!kvm_iodevice_read(bus
->range
[idx
].dev
, range
->addr
,
2938 /* kvm_io_bus_read - called under kvm->slots_lock */
2939 int kvm_io_bus_read(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2942 struct kvm_io_bus
*bus
;
2943 struct kvm_io_range range
;
2946 range
= (struct kvm_io_range
) {
2951 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2952 r
= __kvm_io_bus_read(bus
, &range
, val
);
2953 return r
< 0 ? r
: 0;
2956 /* kvm_io_bus_read_cookie - called under kvm->slots_lock */
2957 int kvm_io_bus_read_cookie(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2958 int len
, void *val
, long cookie
)
2960 struct kvm_io_bus
*bus
;
2961 struct kvm_io_range range
;
2963 range
= (struct kvm_io_range
) {
2968 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2970 /* First try the device referenced by cookie. */
2971 if ((cookie
>= 0) && (cookie
< bus
->dev_count
) &&
2972 (kvm_io_bus_cmp(&range
, &bus
->range
[cookie
]) == 0))
2973 if (!kvm_iodevice_read(bus
->range
[cookie
].dev
, addr
, len
,
2978 * cookie contained garbage; fall back to search and return the
2979 * correct cookie value.
2981 return __kvm_io_bus_read(bus
, &range
, val
);
2984 /* Caller must hold slots_lock. */
2985 int kvm_io_bus_register_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2986 int len
, struct kvm_io_device
*dev
)
2988 struct kvm_io_bus
*new_bus
, *bus
;
2990 bus
= kvm
->buses
[bus_idx
];
2991 /* exclude ioeventfd which is limited by maximum fd */
2992 if (bus
->dev_count
- bus
->ioeventfd_count
> NR_IOBUS_DEVS
- 1)
2995 new_bus
= kzalloc(sizeof(*bus
) + ((bus
->dev_count
+ 1) *
2996 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
2999 memcpy(new_bus
, bus
, sizeof(*bus
) + (bus
->dev_count
*
3000 sizeof(struct kvm_io_range
)));
3001 kvm_io_bus_insert_dev(new_bus
, dev
, addr
, len
);
3002 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3003 synchronize_srcu_expedited(&kvm
->srcu
);
3009 /* Caller must hold slots_lock. */
3010 int kvm_io_bus_unregister_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
3011 struct kvm_io_device
*dev
)
3014 struct kvm_io_bus
*new_bus
, *bus
;
3016 bus
= kvm
->buses
[bus_idx
];
3018 for (i
= 0; i
< bus
->dev_count
; i
++)
3019 if (bus
->range
[i
].dev
== dev
) {
3027 new_bus
= kzalloc(sizeof(*bus
) + ((bus
->dev_count
- 1) *
3028 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
3032 memcpy(new_bus
, bus
, sizeof(*bus
) + i
* sizeof(struct kvm_io_range
));
3033 new_bus
->dev_count
--;
3034 memcpy(new_bus
->range
+ i
, bus
->range
+ i
+ 1,
3035 (new_bus
->dev_count
- i
) * sizeof(struct kvm_io_range
));
3037 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3038 synchronize_srcu_expedited(&kvm
->srcu
);
3043 static struct notifier_block kvm_cpu_notifier
= {
3044 .notifier_call
= kvm_cpu_hotplug
,
3047 static int vm_stat_get(void *_offset
, u64
*val
)
3049 unsigned offset
= (long)_offset
;
3053 raw_spin_lock(&kvm_lock
);
3054 list_for_each_entry(kvm
, &vm_list
, vm_list
)
3055 *val
+= *(u32
*)((void *)kvm
+ offset
);
3056 raw_spin_unlock(&kvm_lock
);
3060 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, NULL
, "%llu\n");
3062 static int vcpu_stat_get(void *_offset
, u64
*val
)
3064 unsigned offset
= (long)_offset
;
3066 struct kvm_vcpu
*vcpu
;
3070 raw_spin_lock(&kvm_lock
);
3071 list_for_each_entry(kvm
, &vm_list
, vm_list
)
3072 kvm_for_each_vcpu(i
, vcpu
, kvm
)
3073 *val
+= *(u32
*)((void *)vcpu
+ offset
);
3075 raw_spin_unlock(&kvm_lock
);
3079 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, NULL
, "%llu\n");
3081 static const struct file_operations
*stat_fops
[] = {
3082 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
3083 [KVM_STAT_VM
] = &vm_stat_fops
,
3086 static int kvm_init_debug(void)
3089 struct kvm_stats_debugfs_item
*p
;
3091 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
3092 if (kvm_debugfs_dir
== NULL
)
3095 for (p
= debugfs_entries
; p
->name
; ++p
) {
3096 p
->dentry
= debugfs_create_file(p
->name
, 0444, kvm_debugfs_dir
,
3097 (void *)(long)p
->offset
,
3098 stat_fops
[p
->kind
]);
3099 if (p
->dentry
== NULL
)
3106 debugfs_remove_recursive(kvm_debugfs_dir
);
3111 static void kvm_exit_debug(void)
3113 struct kvm_stats_debugfs_item
*p
;
3115 for (p
= debugfs_entries
; p
->name
; ++p
)
3116 debugfs_remove(p
->dentry
);
3117 debugfs_remove(kvm_debugfs_dir
);
3120 static int kvm_suspend(void)
3122 if (kvm_usage_count
)
3123 hardware_disable_nolock(NULL
);
3127 static void kvm_resume(void)
3129 if (kvm_usage_count
) {
3130 WARN_ON(raw_spin_is_locked(&kvm_lock
));
3131 hardware_enable_nolock(NULL
);
3135 static struct syscore_ops kvm_syscore_ops
= {
3136 .suspend
= kvm_suspend
,
3137 .resume
= kvm_resume
,
3141 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
3143 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
3146 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
3148 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
3149 if (vcpu
->preempted
)
3150 vcpu
->preempted
= false;
3152 kvm_arch_vcpu_load(vcpu
, cpu
);
3155 static void kvm_sched_out(struct preempt_notifier
*pn
,
3156 struct task_struct
*next
)
3158 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
3160 if (current
->state
== TASK_RUNNING
)
3161 vcpu
->preempted
= true;
3162 kvm_arch_vcpu_put(vcpu
);
3165 int kvm_init(void *opaque
, unsigned vcpu_size
, unsigned vcpu_align
,
3166 struct module
*module
)
3171 r
= kvm_arch_init(opaque
);
3176 * kvm_arch_init makes sure there's at most one caller
3177 * for architectures that support multiple implementations,
3178 * like intel and amd on x86.
3179 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
3180 * conflicts in case kvm is already setup for another implementation.
3182 r
= kvm_irqfd_init();
3186 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
3191 r
= kvm_arch_hardware_setup();
3195 for_each_online_cpu(cpu
) {
3196 smp_call_function_single(cpu
,
3197 kvm_arch_check_processor_compat
,
3203 r
= register_cpu_notifier(&kvm_cpu_notifier
);
3206 register_reboot_notifier(&kvm_reboot_notifier
);
3208 /* A kmem cache lets us meet the alignment requirements of fx_save. */
3210 vcpu_align
= __alignof__(struct kvm_vcpu
);
3211 kvm_vcpu_cache
= kmem_cache_create("kvm_vcpu", vcpu_size
, vcpu_align
,
3213 if (!kvm_vcpu_cache
) {
3218 r
= kvm_async_pf_init();
3222 kvm_chardev_ops
.owner
= module
;
3223 kvm_vm_fops
.owner
= module
;
3224 kvm_vcpu_fops
.owner
= module
;
3226 r
= misc_register(&kvm_dev
);
3228 printk(KERN_ERR
"kvm: misc device register failed\n");
3232 register_syscore_ops(&kvm_syscore_ops
);
3234 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
3235 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
3237 r
= kvm_init_debug();
3239 printk(KERN_ERR
"kvm: create debugfs files failed\n");
3246 unregister_syscore_ops(&kvm_syscore_ops
);
3247 misc_deregister(&kvm_dev
);
3249 kvm_async_pf_deinit();
3251 kmem_cache_destroy(kvm_vcpu_cache
);
3253 unregister_reboot_notifier(&kvm_reboot_notifier
);
3254 unregister_cpu_notifier(&kvm_cpu_notifier
);
3257 kvm_arch_hardware_unsetup();
3259 free_cpumask_var(cpus_hardware_enabled
);
3267 EXPORT_SYMBOL_GPL(kvm_init
);
3272 misc_deregister(&kvm_dev
);
3273 kmem_cache_destroy(kvm_vcpu_cache
);
3274 kvm_async_pf_deinit();
3275 unregister_syscore_ops(&kvm_syscore_ops
);
3276 unregister_reboot_notifier(&kvm_reboot_notifier
);
3277 unregister_cpu_notifier(&kvm_cpu_notifier
);
3278 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3279 kvm_arch_hardware_unsetup();
3282 free_cpumask_var(cpus_hardware_enabled
);
3284 EXPORT_SYMBOL_GPL(kvm_exit
);