4 * Copyright Red Hat, Inc. 2010
7 * Michael S. Tsirkin <mst@redhat.com>
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
12 * Contributions after 2012-01-13 are licensed under the terms of the
13 * GNU GPL, version 2 or (at your option) any later version.
16 #include "hw/virtio/vhost.h"
18 #include "qemu/atomic.h"
19 #include "qemu/range.h"
20 #include "qemu/error-report.h"
21 #include <linux/vhost.h>
22 #include "exec/address-spaces.h"
23 #include "hw/virtio/virtio-bus.h"
24 #include "hw/virtio/virtio-access.h"
25 #include "migration/migration.h"
27 static struct vhost_log
*vhost_log
;
29 static unsigned int used_memslots
;
30 static QLIST_HEAD(, vhost_dev
) vhost_devices
=
31 QLIST_HEAD_INITIALIZER(vhost_devices
);
33 bool vhost_has_free_slot(void)
35 unsigned int slots_limit
= ~0U;
36 struct vhost_dev
*hdev
;
38 QLIST_FOREACH(hdev
, &vhost_devices
, entry
) {
39 unsigned int r
= hdev
->vhost_ops
->vhost_backend_memslots_limit(hdev
);
40 slots_limit
= MIN(slots_limit
, r
);
42 return slots_limit
> used_memslots
;
45 static void vhost_dev_sync_region(struct vhost_dev
*dev
,
46 MemoryRegionSection
*section
,
47 uint64_t mfirst
, uint64_t mlast
,
48 uint64_t rfirst
, uint64_t rlast
)
50 vhost_log_chunk_t
*log
= dev
->log
->log
;
52 uint64_t start
= MAX(mfirst
, rfirst
);
53 uint64_t end
= MIN(mlast
, rlast
);
54 vhost_log_chunk_t
*from
= log
+ start
/ VHOST_LOG_CHUNK
;
55 vhost_log_chunk_t
*to
= log
+ end
/ VHOST_LOG_CHUNK
+ 1;
56 uint64_t addr
= (start
/ VHOST_LOG_CHUNK
) * VHOST_LOG_CHUNK
;
61 assert(end
/ VHOST_LOG_CHUNK
< dev
->log_size
);
62 assert(start
/ VHOST_LOG_CHUNK
< dev
->log_size
);
64 for (;from
< to
; ++from
) {
65 vhost_log_chunk_t log
;
66 /* We first check with non-atomic: much cheaper,
67 * and we expect non-dirty to be the common case. */
69 addr
+= VHOST_LOG_CHUNK
;
72 /* Data must be read atomically. We don't really need barrier semantics
73 * but it's easier to use atomic_* than roll our own. */
74 log
= atomic_xchg(from
, 0);
78 hwaddr section_offset
;
80 page_addr
= addr
+ bit
* VHOST_LOG_PAGE
;
81 section_offset
= page_addr
- section
->offset_within_address_space
;
82 mr_offset
= section_offset
+ section
->offset_within_region
;
83 memory_region_set_dirty(section
->mr
, mr_offset
, VHOST_LOG_PAGE
);
84 log
&= ~(0x1ull
<< bit
);
86 addr
+= VHOST_LOG_CHUNK
;
90 static int vhost_sync_dirty_bitmap(struct vhost_dev
*dev
,
91 MemoryRegionSection
*section
,
99 if (!dev
->log_enabled
|| !dev
->started
) {
102 start_addr
= section
->offset_within_address_space
;
103 end_addr
= range_get_last(start_addr
, int128_get64(section
->size
));
104 start_addr
= MAX(first
, start_addr
);
105 end_addr
= MIN(last
, end_addr
);
107 for (i
= 0; i
< dev
->mem
->nregions
; ++i
) {
108 struct vhost_memory_region
*reg
= dev
->mem
->regions
+ i
;
109 vhost_dev_sync_region(dev
, section
, start_addr
, end_addr
,
110 reg
->guest_phys_addr
,
111 range_get_last(reg
->guest_phys_addr
,
114 for (i
= 0; i
< dev
->nvqs
; ++i
) {
115 struct vhost_virtqueue
*vq
= dev
->vqs
+ i
;
116 vhost_dev_sync_region(dev
, section
, start_addr
, end_addr
, vq
->used_phys
,
117 range_get_last(vq
->used_phys
, vq
->used_size
));
122 static void vhost_log_sync(MemoryListener
*listener
,
123 MemoryRegionSection
*section
)
125 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
127 vhost_sync_dirty_bitmap(dev
, section
, 0x0, ~0x0ULL
);
130 static void vhost_log_sync_range(struct vhost_dev
*dev
,
131 hwaddr first
, hwaddr last
)
134 /* FIXME: this is N^2 in number of sections */
135 for (i
= 0; i
< dev
->n_mem_sections
; ++i
) {
136 MemoryRegionSection
*section
= &dev
->mem_sections
[i
];
137 vhost_sync_dirty_bitmap(dev
, section
, first
, last
);
141 /* Assign/unassign. Keep an unsorted array of non-overlapping
142 * memory regions in dev->mem. */
143 static void vhost_dev_unassign_memory(struct vhost_dev
*dev
,
147 int from
, to
, n
= dev
->mem
->nregions
;
148 /* Track overlapping/split regions for sanity checking. */
149 int overlap_start
= 0, overlap_end
= 0, overlap_middle
= 0, split
= 0;
151 for (from
= 0, to
= 0; from
< n
; ++from
, ++to
) {
152 struct vhost_memory_region
*reg
= dev
->mem
->regions
+ to
;
157 /* clone old region */
159 memcpy(reg
, dev
->mem
->regions
+ from
, sizeof *reg
);
162 /* No overlap is simple */
163 if (!ranges_overlap(reg
->guest_phys_addr
, reg
->memory_size
,
168 /* Split only happens if supplied region
169 * is in the middle of an existing one. Thus it can not
170 * overlap with any other existing region. */
173 reglast
= range_get_last(reg
->guest_phys_addr
, reg
->memory_size
);
174 memlast
= range_get_last(start_addr
, size
);
176 /* Remove whole region */
177 if (start_addr
<= reg
->guest_phys_addr
&& memlast
>= reglast
) {
178 --dev
->mem
->nregions
;
185 if (memlast
>= reglast
) {
186 reg
->memory_size
= start_addr
- reg
->guest_phys_addr
;
187 assert(reg
->memory_size
);
188 assert(!overlap_end
);
194 if (start_addr
<= reg
->guest_phys_addr
) {
195 change
= memlast
+ 1 - reg
->guest_phys_addr
;
196 reg
->memory_size
-= change
;
197 reg
->guest_phys_addr
+= change
;
198 reg
->userspace_addr
+= change
;
199 assert(reg
->memory_size
);
200 assert(!overlap_start
);
205 /* This only happens if supplied region
206 * is in the middle of an existing one. Thus it can not
207 * overlap with any other existing region. */
208 assert(!overlap_start
);
209 assert(!overlap_end
);
210 assert(!overlap_middle
);
211 /* Split region: shrink first part, shift second part. */
212 memcpy(dev
->mem
->regions
+ n
, reg
, sizeof *reg
);
213 reg
->memory_size
= start_addr
- reg
->guest_phys_addr
;
214 assert(reg
->memory_size
);
215 change
= memlast
+ 1 - reg
->guest_phys_addr
;
216 reg
= dev
->mem
->regions
+ n
;
217 reg
->memory_size
-= change
;
218 assert(reg
->memory_size
);
219 reg
->guest_phys_addr
+= change
;
220 reg
->userspace_addr
+= change
;
221 /* Never add more than 1 region */
222 assert(dev
->mem
->nregions
== n
);
223 ++dev
->mem
->nregions
;
228 /* Called after unassign, so no regions overlap the given range. */
229 static void vhost_dev_assign_memory(struct vhost_dev
*dev
,
235 struct vhost_memory_region
*merged
= NULL
;
236 for (from
= 0, to
= 0; from
< dev
->mem
->nregions
; ++from
, ++to
) {
237 struct vhost_memory_region
*reg
= dev
->mem
->regions
+ to
;
238 uint64_t prlast
, urlast
;
239 uint64_t pmlast
, umlast
;
242 /* clone old region */
244 memcpy(reg
, dev
->mem
->regions
+ from
, sizeof *reg
);
246 prlast
= range_get_last(reg
->guest_phys_addr
, reg
->memory_size
);
247 pmlast
= range_get_last(start_addr
, size
);
248 urlast
= range_get_last(reg
->userspace_addr
, reg
->memory_size
);
249 umlast
= range_get_last(uaddr
, size
);
251 /* check for overlapping regions: should never happen. */
252 assert(prlast
< start_addr
|| pmlast
< reg
->guest_phys_addr
);
253 /* Not an adjacent or overlapping region - do not merge. */
254 if ((prlast
+ 1 != start_addr
|| urlast
+ 1 != uaddr
) &&
255 (pmlast
+ 1 != reg
->guest_phys_addr
||
256 umlast
+ 1 != reg
->userspace_addr
)) {
266 u
= MIN(uaddr
, reg
->userspace_addr
);
267 s
= MIN(start_addr
, reg
->guest_phys_addr
);
268 e
= MAX(pmlast
, prlast
);
269 uaddr
= merged
->userspace_addr
= u
;
270 start_addr
= merged
->guest_phys_addr
= s
;
271 size
= merged
->memory_size
= e
- s
+ 1;
272 assert(merged
->memory_size
);
276 struct vhost_memory_region
*reg
= dev
->mem
->regions
+ to
;
277 memset(reg
, 0, sizeof *reg
);
278 reg
->memory_size
= size
;
279 assert(reg
->memory_size
);
280 reg
->guest_phys_addr
= start_addr
;
281 reg
->userspace_addr
= uaddr
;
284 assert(to
<= dev
->mem
->nregions
+ 1);
285 dev
->mem
->nregions
= to
;
288 static uint64_t vhost_get_log_size(struct vhost_dev
*dev
)
290 uint64_t log_size
= 0;
292 for (i
= 0; i
< dev
->mem
->nregions
; ++i
) {
293 struct vhost_memory_region
*reg
= dev
->mem
->regions
+ i
;
294 uint64_t last
= range_get_last(reg
->guest_phys_addr
,
296 log_size
= MAX(log_size
, last
/ VHOST_LOG_CHUNK
+ 1);
298 for (i
= 0; i
< dev
->nvqs
; ++i
) {
299 struct vhost_virtqueue
*vq
= dev
->vqs
+ i
;
300 uint64_t last
= vq
->used_phys
+ vq
->used_size
- 1;
301 log_size
= MAX(log_size
, last
/ VHOST_LOG_CHUNK
+ 1);
305 static struct vhost_log
*vhost_log_alloc(uint64_t size
)
307 struct vhost_log
*log
= g_malloc0(sizeof *log
+ size
* sizeof(*(log
->log
)));
315 static struct vhost_log
*vhost_log_get(uint64_t size
)
317 if (!vhost_log
|| vhost_log
->size
!= size
) {
318 vhost_log
= vhost_log_alloc(size
);
326 static void vhost_log_put(struct vhost_dev
*dev
, bool sync
)
328 struct vhost_log
*log
= dev
->log
;
335 if (log
->refcnt
== 0) {
336 /* Sync only the range covered by the old log */
337 if (dev
->log_size
&& sync
) {
338 vhost_log_sync_range(dev
, 0, dev
->log_size
* VHOST_LOG_CHUNK
- 1);
340 if (vhost_log
== log
) {
347 static inline void vhost_dev_log_resize(struct vhost_dev
* dev
, uint64_t size
)
349 struct vhost_log
*log
= vhost_log_get(size
);
350 uint64_t log_base
= (uintptr_t)log
->log
;
353 r
= dev
->vhost_ops
->vhost_call(dev
, VHOST_SET_LOG_BASE
, &log_base
);
355 vhost_log_put(dev
, true);
357 dev
->log_size
= size
;
360 static int vhost_verify_ring_mappings(struct vhost_dev
*dev
,
367 for (i
= 0; !r
&& i
< dev
->nvqs
; ++i
) {
368 struct vhost_virtqueue
*vq
= dev
->vqs
+ i
;
372 if (!ranges_overlap(start_addr
, size
, vq
->ring_phys
, vq
->ring_size
)) {
376 p
= cpu_physical_memory_map(vq
->ring_phys
, &l
, 1);
377 if (!p
|| l
!= vq
->ring_size
) {
378 fprintf(stderr
, "Unable to map ring buffer for ring %d\n", i
);
382 fprintf(stderr
, "Ring buffer relocated for ring %d\n", i
);
385 cpu_physical_memory_unmap(p
, l
, 0, 0);
390 static struct vhost_memory_region
*vhost_dev_find_reg(struct vhost_dev
*dev
,
394 int i
, n
= dev
->mem
->nregions
;
395 for (i
= 0; i
< n
; ++i
) {
396 struct vhost_memory_region
*reg
= dev
->mem
->regions
+ i
;
397 if (ranges_overlap(reg
->guest_phys_addr
, reg
->memory_size
,
405 static bool vhost_dev_cmp_memory(struct vhost_dev
*dev
,
410 struct vhost_memory_region
*reg
= vhost_dev_find_reg(dev
, start_addr
, size
);
418 reglast
= range_get_last(reg
->guest_phys_addr
, reg
->memory_size
);
419 memlast
= range_get_last(start_addr
, size
);
421 /* Need to extend region? */
422 if (start_addr
< reg
->guest_phys_addr
|| memlast
> reglast
) {
425 /* userspace_addr changed? */
426 return uaddr
!= reg
->userspace_addr
+ start_addr
- reg
->guest_phys_addr
;
429 static void vhost_set_memory(MemoryListener
*listener
,
430 MemoryRegionSection
*section
,
433 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
435 hwaddr start_addr
= section
->offset_within_address_space
;
436 ram_addr_t size
= int128_get64(section
->size
);
438 memory_region_get_dirty_log_mask(section
->mr
) & ~(1 << DIRTY_MEMORY_MIGRATION
);
439 int s
= offsetof(struct vhost_memory
, regions
) +
440 (dev
->mem
->nregions
+ 1) * sizeof dev
->mem
->regions
[0];
443 dev
->mem
= g_realloc(dev
->mem
, s
);
451 /* Optimize no-change case. At least cirrus_vga does this a lot at this time. */
452 ram
= memory_region_get_ram_ptr(section
->mr
) + section
->offset_within_region
;
454 if (!vhost_dev_cmp_memory(dev
, start_addr
, size
, (uintptr_t)ram
)) {
455 /* Region exists with same address. Nothing to do. */
459 if (!vhost_dev_find_reg(dev
, start_addr
, size
)) {
460 /* Removing region that we don't access. Nothing to do. */
465 vhost_dev_unassign_memory(dev
, start_addr
, size
);
467 /* Add given mapping, merging adjacent regions if any */
468 vhost_dev_assign_memory(dev
, start_addr
, size
, (uintptr_t)ram
);
470 /* Remove old mapping for this memory, if any. */
471 vhost_dev_unassign_memory(dev
, start_addr
, size
);
473 dev
->mem_changed_start_addr
= MIN(dev
->mem_changed_start_addr
, start_addr
);
474 dev
->mem_changed_end_addr
= MAX(dev
->mem_changed_end_addr
, start_addr
+ size
- 1);
475 dev
->memory_changed
= true;
476 used_memslots
= dev
->mem
->nregions
;
479 static bool vhost_section(MemoryRegionSection
*section
)
481 return memory_region_is_ram(section
->mr
);
484 static void vhost_begin(MemoryListener
*listener
)
486 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
488 dev
->mem_changed_end_addr
= 0;
489 dev
->mem_changed_start_addr
= -1;
492 static void vhost_commit(MemoryListener
*listener
)
494 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
496 hwaddr start_addr
= 0;
501 if (!dev
->memory_changed
) {
507 if (dev
->mem_changed_start_addr
> dev
->mem_changed_end_addr
) {
512 start_addr
= dev
->mem_changed_start_addr
;
513 size
= dev
->mem_changed_end_addr
- dev
->mem_changed_start_addr
+ 1;
515 r
= vhost_verify_ring_mappings(dev
, start_addr
, size
);
519 if (!dev
->log_enabled
) {
520 r
= dev
->vhost_ops
->vhost_call(dev
, VHOST_SET_MEM_TABLE
, dev
->mem
);
522 dev
->memory_changed
= false;
525 log_size
= vhost_get_log_size(dev
);
526 /* We allocate an extra 4K bytes to log,
527 * to reduce the * number of reallocations. */
528 #define VHOST_LOG_BUFFER (0x1000 / sizeof *dev->log)
529 /* To log more, must increase log size before table update. */
530 if (dev
->log_size
< log_size
) {
531 vhost_dev_log_resize(dev
, log_size
+ VHOST_LOG_BUFFER
);
533 r
= dev
->vhost_ops
->vhost_call(dev
, VHOST_SET_MEM_TABLE
, dev
->mem
);
535 /* To log less, can only decrease log size after table update. */
536 if (dev
->log_size
> log_size
+ VHOST_LOG_BUFFER
) {
537 vhost_dev_log_resize(dev
, log_size
);
539 dev
->memory_changed
= false;
542 static void vhost_region_add(MemoryListener
*listener
,
543 MemoryRegionSection
*section
)
545 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
548 if (!vhost_section(section
)) {
552 ++dev
->n_mem_sections
;
553 dev
->mem_sections
= g_renew(MemoryRegionSection
, dev
->mem_sections
,
554 dev
->n_mem_sections
);
555 dev
->mem_sections
[dev
->n_mem_sections
- 1] = *section
;
556 memory_region_ref(section
->mr
);
557 vhost_set_memory(listener
, section
, true);
560 static void vhost_region_del(MemoryListener
*listener
,
561 MemoryRegionSection
*section
)
563 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
567 if (!vhost_section(section
)) {
571 vhost_set_memory(listener
, section
, false);
572 memory_region_unref(section
->mr
);
573 for (i
= 0; i
< dev
->n_mem_sections
; ++i
) {
574 if (dev
->mem_sections
[i
].offset_within_address_space
575 == section
->offset_within_address_space
) {
576 --dev
->n_mem_sections
;
577 memmove(&dev
->mem_sections
[i
], &dev
->mem_sections
[i
+1],
578 (dev
->n_mem_sections
- i
) * sizeof(*dev
->mem_sections
));
584 static void vhost_region_nop(MemoryListener
*listener
,
585 MemoryRegionSection
*section
)
589 static int vhost_virtqueue_set_addr(struct vhost_dev
*dev
,
590 struct vhost_virtqueue
*vq
,
591 unsigned idx
, bool enable_log
)
593 struct vhost_vring_addr addr
= {
595 .desc_user_addr
= (uint64_t)(unsigned long)vq
->desc
,
596 .avail_user_addr
= (uint64_t)(unsigned long)vq
->avail
,
597 .used_user_addr
= (uint64_t)(unsigned long)vq
->used
,
598 .log_guest_addr
= vq
->used_phys
,
599 .flags
= enable_log
? (1 << VHOST_VRING_F_LOG
) : 0,
601 int r
= dev
->vhost_ops
->vhost_call(dev
, VHOST_SET_VRING_ADDR
, &addr
);
608 static int vhost_dev_set_features(struct vhost_dev
*dev
, bool enable_log
)
610 uint64_t features
= dev
->acked_features
;
613 features
|= 0x1ULL
<< VHOST_F_LOG_ALL
;
615 r
= dev
->vhost_ops
->vhost_call(dev
, VHOST_SET_FEATURES
, &features
);
616 return r
< 0 ? -errno
: 0;
619 static int vhost_dev_set_log(struct vhost_dev
*dev
, bool enable_log
)
622 r
= vhost_dev_set_features(dev
, enable_log
);
626 for (i
= 0; i
< dev
->nvqs
; ++i
) {
627 r
= vhost_virtqueue_set_addr(dev
, dev
->vqs
+ i
, i
,
635 for (; i
>= 0; --i
) {
636 t
= vhost_virtqueue_set_addr(dev
, dev
->vqs
+ i
, i
,
640 t
= vhost_dev_set_features(dev
, dev
->log_enabled
);
646 static int vhost_migration_log(MemoryListener
*listener
, int enable
)
648 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
651 if (!!enable
== dev
->log_enabled
) {
655 dev
->log_enabled
= enable
;
659 r
= vhost_dev_set_log(dev
, false);
663 vhost_log_put(dev
, false);
667 vhost_dev_log_resize(dev
, vhost_get_log_size(dev
));
668 r
= vhost_dev_set_log(dev
, true);
673 dev
->log_enabled
= enable
;
677 static void vhost_log_global_start(MemoryListener
*listener
)
681 r
= vhost_migration_log(listener
, true);
687 static void vhost_log_global_stop(MemoryListener
*listener
)
691 r
= vhost_migration_log(listener
, false);
697 static void vhost_log_start(MemoryListener
*listener
,
698 MemoryRegionSection
*section
,
701 /* FIXME: implement */
704 static void vhost_log_stop(MemoryListener
*listener
,
705 MemoryRegionSection
*section
,
708 /* FIXME: implement */
711 static int vhost_virtqueue_set_vring_endian_legacy(struct vhost_dev
*dev
,
715 struct vhost_vring_state s
= {
716 .index
= vhost_vq_index
,
720 if (!dev
->vhost_ops
->vhost_call(dev
, VHOST_SET_VRING_ENDIAN
, &s
)) {
724 if (errno
== ENOTTY
) {
725 error_report("vhost does not support cross-endian");
732 static int vhost_virtqueue_start(struct vhost_dev
*dev
,
733 struct VirtIODevice
*vdev
,
734 struct vhost_virtqueue
*vq
,
739 int vhost_vq_index
= dev
->vhost_ops
->vhost_backend_get_vq_index(dev
, idx
);
740 struct vhost_vring_file file
= {
741 .index
= vhost_vq_index
743 struct vhost_vring_state state
= {
744 .index
= vhost_vq_index
746 struct VirtQueue
*vvq
= virtio_get_queue(vdev
, idx
);
749 vq
->num
= state
.num
= virtio_queue_get_num(vdev
, idx
);
750 r
= dev
->vhost_ops
->vhost_call(dev
, VHOST_SET_VRING_NUM
, &state
);
755 state
.num
= virtio_queue_get_last_avail_idx(vdev
, idx
);
756 r
= dev
->vhost_ops
->vhost_call(dev
, VHOST_SET_VRING_BASE
, &state
);
761 if (!virtio_vdev_has_feature(vdev
, VIRTIO_F_VERSION_1
) &&
762 virtio_legacy_is_cross_endian(vdev
)) {
763 r
= vhost_virtqueue_set_vring_endian_legacy(dev
,
764 virtio_is_big_endian(vdev
),
771 s
= l
= virtio_queue_get_desc_size(vdev
, idx
);
772 a
= virtio_queue_get_desc_addr(vdev
, idx
);
773 vq
->desc
= cpu_physical_memory_map(a
, &l
, 0);
774 if (!vq
->desc
|| l
!= s
) {
776 goto fail_alloc_desc
;
778 s
= l
= virtio_queue_get_avail_size(vdev
, idx
);
779 a
= virtio_queue_get_avail_addr(vdev
, idx
);
780 vq
->avail
= cpu_physical_memory_map(a
, &l
, 0);
781 if (!vq
->avail
|| l
!= s
) {
783 goto fail_alloc_avail
;
785 vq
->used_size
= s
= l
= virtio_queue_get_used_size(vdev
, idx
);
786 vq
->used_phys
= a
= virtio_queue_get_used_addr(vdev
, idx
);
787 vq
->used
= cpu_physical_memory_map(a
, &l
, 1);
788 if (!vq
->used
|| l
!= s
) {
790 goto fail_alloc_used
;
793 vq
->ring_size
= s
= l
= virtio_queue_get_ring_size(vdev
, idx
);
794 vq
->ring_phys
= a
= virtio_queue_get_ring_addr(vdev
, idx
);
795 vq
->ring
= cpu_physical_memory_map(a
, &l
, 1);
796 if (!vq
->ring
|| l
!= s
) {
798 goto fail_alloc_ring
;
801 r
= vhost_virtqueue_set_addr(dev
, vq
, vhost_vq_index
, dev
->log_enabled
);
807 file
.fd
= event_notifier_get_fd(virtio_queue_get_host_notifier(vvq
));
808 r
= dev
->vhost_ops
->vhost_call(dev
, VHOST_SET_VRING_KICK
, &file
);
814 /* Clear and discard previous events if any. */
815 event_notifier_test_and_clear(&vq
->masked_notifier
);
821 cpu_physical_memory_unmap(vq
->ring
, virtio_queue_get_ring_size(vdev
, idx
),
824 cpu_physical_memory_unmap(vq
->used
, virtio_queue_get_used_size(vdev
, idx
),
827 cpu_physical_memory_unmap(vq
->avail
, virtio_queue_get_avail_size(vdev
, idx
),
830 cpu_physical_memory_unmap(vq
->desc
, virtio_queue_get_desc_size(vdev
, idx
),
836 static void vhost_virtqueue_stop(struct vhost_dev
*dev
,
837 struct VirtIODevice
*vdev
,
838 struct vhost_virtqueue
*vq
,
841 int vhost_vq_index
= dev
->vhost_ops
->vhost_backend_get_vq_index(dev
, idx
);
842 struct vhost_vring_state state
= {
843 .index
= vhost_vq_index
,
847 r
= dev
->vhost_ops
->vhost_call(dev
, VHOST_GET_VRING_BASE
, &state
);
849 fprintf(stderr
, "vhost VQ %d ring restore failed: %d\n", idx
, r
);
852 virtio_queue_set_last_avail_idx(vdev
, idx
, state
.num
);
853 virtio_queue_invalidate_signalled_used(vdev
, idx
);
855 /* In the cross-endian case, we need to reset the vring endianness to
856 * native as legacy devices expect so by default.
858 if (!virtio_vdev_has_feature(vdev
, VIRTIO_F_VERSION_1
) &&
859 virtio_legacy_is_cross_endian(vdev
)) {
860 r
= vhost_virtqueue_set_vring_endian_legacy(dev
,
861 !virtio_is_big_endian(vdev
),
864 error_report("failed to reset vring endianness");
869 cpu_physical_memory_unmap(vq
->ring
, virtio_queue_get_ring_size(vdev
, idx
),
870 0, virtio_queue_get_ring_size(vdev
, idx
));
871 cpu_physical_memory_unmap(vq
->used
, virtio_queue_get_used_size(vdev
, idx
),
872 1, virtio_queue_get_used_size(vdev
, idx
));
873 cpu_physical_memory_unmap(vq
->avail
, virtio_queue_get_avail_size(vdev
, idx
),
874 0, virtio_queue_get_avail_size(vdev
, idx
));
875 cpu_physical_memory_unmap(vq
->desc
, virtio_queue_get_desc_size(vdev
, idx
),
876 0, virtio_queue_get_desc_size(vdev
, idx
));
879 static void vhost_eventfd_add(MemoryListener
*listener
,
880 MemoryRegionSection
*section
,
881 bool match_data
, uint64_t data
, EventNotifier
*e
)
885 static void vhost_eventfd_del(MemoryListener
*listener
,
886 MemoryRegionSection
*section
,
887 bool match_data
, uint64_t data
, EventNotifier
*e
)
891 static int vhost_virtqueue_init(struct vhost_dev
*dev
,
892 struct vhost_virtqueue
*vq
, int n
)
894 int vhost_vq_index
= dev
->vhost_ops
->vhost_backend_get_vq_index(dev
, n
);
895 struct vhost_vring_file file
= {
896 .index
= vhost_vq_index
,
898 int r
= event_notifier_init(&vq
->masked_notifier
, 0);
903 file
.fd
= event_notifier_get_fd(&vq
->masked_notifier
);
904 r
= dev
->vhost_ops
->vhost_call(dev
, VHOST_SET_VRING_CALL
, &file
);
911 event_notifier_cleanup(&vq
->masked_notifier
);
915 static void vhost_virtqueue_cleanup(struct vhost_virtqueue
*vq
)
917 event_notifier_cleanup(&vq
->masked_notifier
);
920 int vhost_dev_init(struct vhost_dev
*hdev
, void *opaque
,
921 VhostBackendType backend_type
)
926 if (vhost_set_backend_type(hdev
, backend_type
) < 0) {
927 close((uintptr_t)opaque
);
931 if (hdev
->vhost_ops
->vhost_backend_init(hdev
, opaque
) < 0) {
932 close((uintptr_t)opaque
);
936 if (used_memslots
> hdev
->vhost_ops
->vhost_backend_memslots_limit(hdev
)) {
937 fprintf(stderr
, "vhost backend memory slots limit is less"
938 " than current number of present memory slots\n");
939 close((uintptr_t)opaque
);
942 QLIST_INSERT_HEAD(&vhost_devices
, hdev
, entry
);
944 r
= hdev
->vhost_ops
->vhost_call(hdev
, VHOST_SET_OWNER
, NULL
);
949 r
= hdev
->vhost_ops
->vhost_call(hdev
, VHOST_GET_FEATURES
, &features
);
954 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
955 r
= vhost_virtqueue_init(hdev
, hdev
->vqs
+ i
, hdev
->vq_index
+ i
);
960 hdev
->features
= features
;
962 hdev
->memory_listener
= (MemoryListener
) {
963 .begin
= vhost_begin
,
964 .commit
= vhost_commit
,
965 .region_add
= vhost_region_add
,
966 .region_del
= vhost_region_del
,
967 .region_nop
= vhost_region_nop
,
968 .log_start
= vhost_log_start
,
969 .log_stop
= vhost_log_stop
,
970 .log_sync
= vhost_log_sync
,
971 .log_global_start
= vhost_log_global_start
,
972 .log_global_stop
= vhost_log_global_stop
,
973 .eventfd_add
= vhost_eventfd_add
,
974 .eventfd_del
= vhost_eventfd_del
,
977 hdev
->migration_blocker
= NULL
;
978 if (!(hdev
->features
& (0x1ULL
<< VHOST_F_LOG_ALL
))) {
979 error_setg(&hdev
->migration_blocker
,
980 "Migration disabled: vhost lacks VHOST_F_LOG_ALL feature.");
981 migrate_add_blocker(hdev
->migration_blocker
);
983 hdev
->mem
= g_malloc0(offsetof(struct vhost_memory
, regions
));
984 hdev
->n_mem_sections
= 0;
985 hdev
->mem_sections
= NULL
;
988 hdev
->log_enabled
= false;
989 hdev
->started
= false;
990 hdev
->memory_changed
= false;
991 memory_listener_register(&hdev
->memory_listener
, &address_space_memory
);
995 vhost_virtqueue_cleanup(hdev
->vqs
+ i
);
999 hdev
->vhost_ops
->vhost_backend_cleanup(hdev
);
1000 QLIST_REMOVE(hdev
, entry
);
1004 void vhost_dev_cleanup(struct vhost_dev
*hdev
)
1007 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1008 vhost_virtqueue_cleanup(hdev
->vqs
+ i
);
1010 memory_listener_unregister(&hdev
->memory_listener
);
1011 if (hdev
->migration_blocker
) {
1012 migrate_del_blocker(hdev
->migration_blocker
);
1013 error_free(hdev
->migration_blocker
);
1016 g_free(hdev
->mem_sections
);
1017 hdev
->vhost_ops
->vhost_backend_cleanup(hdev
);
1018 QLIST_REMOVE(hdev
, entry
);
1021 /* Stop processing guest IO notifications in qemu.
1022 * Start processing them in vhost in kernel.
1024 int vhost_dev_enable_notifiers(struct vhost_dev
*hdev
, VirtIODevice
*vdev
)
1026 BusState
*qbus
= BUS(qdev_get_parent_bus(DEVICE(vdev
)));
1027 VirtioBusState
*vbus
= VIRTIO_BUS(qbus
);
1028 VirtioBusClass
*k
= VIRTIO_BUS_GET_CLASS(vbus
);
1030 if (!k
->set_host_notifier
) {
1031 fprintf(stderr
, "binding does not support host notifiers\n");
1036 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1037 r
= k
->set_host_notifier(qbus
->parent
, hdev
->vq_index
+ i
, true);
1039 fprintf(stderr
, "vhost VQ %d notifier binding failed: %d\n", i
, -r
);
1047 e
= k
->set_host_notifier(qbus
->parent
, hdev
->vq_index
+ i
, false);
1049 fprintf(stderr
, "vhost VQ %d notifier cleanup error: %d\n", i
, -r
);
1058 /* Stop processing guest IO notifications in vhost.
1059 * Start processing them in qemu.
1060 * This might actually run the qemu handlers right away,
1061 * so virtio in qemu must be completely setup when this is called.
1063 void vhost_dev_disable_notifiers(struct vhost_dev
*hdev
, VirtIODevice
*vdev
)
1065 BusState
*qbus
= BUS(qdev_get_parent_bus(DEVICE(vdev
)));
1066 VirtioBusState
*vbus
= VIRTIO_BUS(qbus
);
1067 VirtioBusClass
*k
= VIRTIO_BUS_GET_CLASS(vbus
);
1070 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1071 r
= k
->set_host_notifier(qbus
->parent
, hdev
->vq_index
+ i
, false);
1073 fprintf(stderr
, "vhost VQ %d notifier cleanup failed: %d\n", i
, -r
);
1080 /* Test and clear event pending status.
1081 * Should be called after unmask to avoid losing events.
1083 bool vhost_virtqueue_pending(struct vhost_dev
*hdev
, int n
)
1085 struct vhost_virtqueue
*vq
= hdev
->vqs
+ n
- hdev
->vq_index
;
1086 assert(n
>= hdev
->vq_index
&& n
< hdev
->vq_index
+ hdev
->nvqs
);
1087 return event_notifier_test_and_clear(&vq
->masked_notifier
);
1090 /* Mask/unmask events from this vq. */
1091 void vhost_virtqueue_mask(struct vhost_dev
*hdev
, VirtIODevice
*vdev
, int n
,
1094 struct VirtQueue
*vvq
= virtio_get_queue(vdev
, n
);
1095 int r
, index
= n
- hdev
->vq_index
;
1096 struct vhost_vring_file file
;
1099 file
.fd
= event_notifier_get_fd(&hdev
->vqs
[index
].masked_notifier
);
1101 file
.fd
= event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq
));
1104 file
.index
= hdev
->vhost_ops
->vhost_backend_get_vq_index(hdev
, n
);
1105 r
= hdev
->vhost_ops
->vhost_call(hdev
, VHOST_SET_VRING_CALL
, &file
);
1109 uint64_t vhost_get_features(struct vhost_dev
*hdev
, const int *feature_bits
,
1112 const int *bit
= feature_bits
;
1113 while (*bit
!= VHOST_INVALID_FEATURE_BIT
) {
1114 uint64_t bit_mask
= (1ULL << *bit
);
1115 if (!(hdev
->features
& bit_mask
)) {
1116 features
&= ~bit_mask
;
1123 void vhost_ack_features(struct vhost_dev
*hdev
, const int *feature_bits
,
1126 const int *bit
= feature_bits
;
1127 while (*bit
!= VHOST_INVALID_FEATURE_BIT
) {
1128 uint64_t bit_mask
= (1ULL << *bit
);
1129 if (features
& bit_mask
) {
1130 hdev
->acked_features
|= bit_mask
;
1136 /* Host notifiers must be enabled at this point. */
1137 int vhost_dev_start(struct vhost_dev
*hdev
, VirtIODevice
*vdev
)
1141 hdev
->started
= true;
1143 r
= vhost_dev_set_features(hdev
, hdev
->log_enabled
);
1147 r
= hdev
->vhost_ops
->vhost_call(hdev
, VHOST_SET_MEM_TABLE
, hdev
->mem
);
1152 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1153 r
= vhost_virtqueue_start(hdev
,
1156 hdev
->vq_index
+ i
);
1162 if (hdev
->log_enabled
) {
1165 hdev
->log_size
= vhost_get_log_size(hdev
);
1166 hdev
->log
= vhost_log_get(hdev
->log_size
);
1167 log_base
= (uintptr_t)hdev
->log
->log
;
1168 r
= hdev
->vhost_ops
->vhost_call(hdev
, VHOST_SET_LOG_BASE
,
1169 hdev
->log_size
? &log_base
: NULL
);
1178 vhost_log_put(hdev
, false);
1181 vhost_virtqueue_stop(hdev
,
1184 hdev
->vq_index
+ i
);
1190 hdev
->started
= false;
1194 /* Host notifiers must be enabled at this point. */
1195 void vhost_dev_stop(struct vhost_dev
*hdev
, VirtIODevice
*vdev
)
1199 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1200 vhost_virtqueue_stop(hdev
,
1203 hdev
->vq_index
+ i
);
1206 vhost_log_put(hdev
, true);
1207 hdev
->started
= false;