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 "qemu/osdep.h"
17 #include "qapi/error.h"
18 #include "hw/virtio/vhost.h"
19 #include "qemu/atomic.h"
20 #include "qemu/range.h"
21 #include "qemu/error-report.h"
22 #include "qemu/memfd.h"
23 #include "standard-headers/linux/vhost_types.h"
24 #include "exec/address-spaces.h"
25 #include "hw/virtio/virtio-bus.h"
26 #include "hw/virtio/virtio-access.h"
27 #include "migration/blocker.h"
28 #include "migration/qemu-file-types.h"
29 #include "sysemu/dma.h"
32 /* enabled until disconnected backend stabilizes */
33 #define _VHOST_DEBUG 1
36 #define VHOST_OPS_DEBUG(fmt, ...) \
37 do { error_report(fmt ": %s (%d)", ## __VA_ARGS__, \
38 strerror(errno), errno); } while (0)
40 #define VHOST_OPS_DEBUG(fmt, ...) \
44 static struct vhost_log
*vhost_log
;
45 static struct vhost_log
*vhost_log_shm
;
47 static unsigned int used_memslots
;
48 static QLIST_HEAD(, vhost_dev
) vhost_devices
=
49 QLIST_HEAD_INITIALIZER(vhost_devices
);
51 bool vhost_has_free_slot(void)
53 unsigned int slots_limit
= ~0U;
54 struct vhost_dev
*hdev
;
56 QLIST_FOREACH(hdev
, &vhost_devices
, entry
) {
57 unsigned int r
= hdev
->vhost_ops
->vhost_backend_memslots_limit(hdev
);
58 slots_limit
= MIN(slots_limit
, r
);
60 return slots_limit
> used_memslots
;
63 static void vhost_dev_sync_region(struct vhost_dev
*dev
,
64 MemoryRegionSection
*section
,
65 uint64_t mfirst
, uint64_t mlast
,
66 uint64_t rfirst
, uint64_t rlast
)
68 vhost_log_chunk_t
*log
= dev
->log
->log
;
70 uint64_t start
= MAX(mfirst
, rfirst
);
71 uint64_t end
= MIN(mlast
, rlast
);
72 vhost_log_chunk_t
*from
= log
+ start
/ VHOST_LOG_CHUNK
;
73 vhost_log_chunk_t
*to
= log
+ end
/ VHOST_LOG_CHUNK
+ 1;
74 uint64_t addr
= QEMU_ALIGN_DOWN(start
, VHOST_LOG_CHUNK
);
79 assert(end
/ VHOST_LOG_CHUNK
< dev
->log_size
);
80 assert(start
/ VHOST_LOG_CHUNK
< dev
->log_size
);
82 for (;from
< to
; ++from
) {
83 vhost_log_chunk_t log
;
84 /* We first check with non-atomic: much cheaper,
85 * and we expect non-dirty to be the common case. */
87 addr
+= VHOST_LOG_CHUNK
;
90 /* Data must be read atomically. We don't really need barrier semantics
91 * but it's easier to use atomic_* than roll our own. */
92 log
= atomic_xchg(from
, 0);
96 hwaddr section_offset
;
98 page_addr
= addr
+ bit
* VHOST_LOG_PAGE
;
99 section_offset
= page_addr
- section
->offset_within_address_space
;
100 mr_offset
= section_offset
+ section
->offset_within_region
;
101 memory_region_set_dirty(section
->mr
, mr_offset
, VHOST_LOG_PAGE
);
102 log
&= ~(0x1ull
<< bit
);
104 addr
+= VHOST_LOG_CHUNK
;
108 static int vhost_sync_dirty_bitmap(struct vhost_dev
*dev
,
109 MemoryRegionSection
*section
,
117 if (!dev
->log_enabled
|| !dev
->started
) {
120 start_addr
= section
->offset_within_address_space
;
121 end_addr
= range_get_last(start_addr
, int128_get64(section
->size
));
122 start_addr
= MAX(first
, start_addr
);
123 end_addr
= MIN(last
, end_addr
);
125 for (i
= 0; i
< dev
->mem
->nregions
; ++i
) {
126 struct vhost_memory_region
*reg
= dev
->mem
->regions
+ i
;
127 vhost_dev_sync_region(dev
, section
, start_addr
, end_addr
,
128 reg
->guest_phys_addr
,
129 range_get_last(reg
->guest_phys_addr
,
132 for (i
= 0; i
< dev
->nvqs
; ++i
) {
133 struct vhost_virtqueue
*vq
= dev
->vqs
+ i
;
135 if (!vq
->used_phys
&& !vq
->used_size
) {
139 vhost_dev_sync_region(dev
, section
, start_addr
, end_addr
, vq
->used_phys
,
140 range_get_last(vq
->used_phys
, vq
->used_size
));
145 static void vhost_log_sync(MemoryListener
*listener
,
146 MemoryRegionSection
*section
)
148 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
150 vhost_sync_dirty_bitmap(dev
, section
, 0x0, ~0x0ULL
);
153 static void vhost_log_sync_range(struct vhost_dev
*dev
,
154 hwaddr first
, hwaddr last
)
157 /* FIXME: this is N^2 in number of sections */
158 for (i
= 0; i
< dev
->n_mem_sections
; ++i
) {
159 MemoryRegionSection
*section
= &dev
->mem_sections
[i
];
160 vhost_sync_dirty_bitmap(dev
, section
, first
, last
);
164 static uint64_t vhost_get_log_size(struct vhost_dev
*dev
)
166 uint64_t log_size
= 0;
168 for (i
= 0; i
< dev
->mem
->nregions
; ++i
) {
169 struct vhost_memory_region
*reg
= dev
->mem
->regions
+ i
;
170 uint64_t last
= range_get_last(reg
->guest_phys_addr
,
172 log_size
= MAX(log_size
, last
/ VHOST_LOG_CHUNK
+ 1);
174 for (i
= 0; i
< dev
->nvqs
; ++i
) {
175 struct vhost_virtqueue
*vq
= dev
->vqs
+ i
;
177 if (!vq
->used_phys
&& !vq
->used_size
) {
181 uint64_t last
= vq
->used_phys
+ vq
->used_size
- 1;
182 log_size
= MAX(log_size
, last
/ VHOST_LOG_CHUNK
+ 1);
187 static struct vhost_log
*vhost_log_alloc(uint64_t size
, bool share
)
190 struct vhost_log
*log
;
191 uint64_t logsize
= size
* sizeof(*(log
->log
));
194 log
= g_new0(struct vhost_log
, 1);
196 log
->log
= qemu_memfd_alloc("vhost-log", logsize
,
197 F_SEAL_GROW
| F_SEAL_SHRINK
| F_SEAL_SEAL
,
200 error_report_err(err
);
204 memset(log
->log
, 0, logsize
);
206 log
->log
= g_malloc0(logsize
);
216 static struct vhost_log
*vhost_log_get(uint64_t size
, bool share
)
218 struct vhost_log
*log
= share
? vhost_log_shm
: vhost_log
;
220 if (!log
|| log
->size
!= size
) {
221 log
= vhost_log_alloc(size
, share
);
234 static void vhost_log_put(struct vhost_dev
*dev
, bool sync
)
236 struct vhost_log
*log
= dev
->log
;
243 if (log
->refcnt
== 0) {
244 /* Sync only the range covered by the old log */
245 if (dev
->log_size
&& sync
) {
246 vhost_log_sync_range(dev
, 0, dev
->log_size
* VHOST_LOG_CHUNK
- 1);
249 if (vhost_log
== log
) {
252 } else if (vhost_log_shm
== log
) {
253 qemu_memfd_free(log
->log
, log
->size
* sizeof(*(log
->log
)),
255 vhost_log_shm
= NULL
;
265 static bool vhost_dev_log_is_shared(struct vhost_dev
*dev
)
267 return dev
->vhost_ops
->vhost_requires_shm_log
&&
268 dev
->vhost_ops
->vhost_requires_shm_log(dev
);
271 static inline void vhost_dev_log_resize(struct vhost_dev
*dev
, uint64_t size
)
273 struct vhost_log
*log
= vhost_log_get(size
, vhost_dev_log_is_shared(dev
));
274 uint64_t log_base
= (uintptr_t)log
->log
;
277 /* inform backend of log switching, this must be done before
278 releasing the current log, to ensure no logging is lost */
279 r
= dev
->vhost_ops
->vhost_set_log_base(dev
, log_base
, log
);
281 VHOST_OPS_DEBUG("vhost_set_log_base failed");
284 vhost_log_put(dev
, true);
286 dev
->log_size
= size
;
289 static int vhost_dev_has_iommu(struct vhost_dev
*dev
)
291 VirtIODevice
*vdev
= dev
->vdev
;
294 * For vhost, VIRTIO_F_IOMMU_PLATFORM means the backend support
295 * incremental memory mapping API via IOTLB API. For platform that
296 * does not have IOMMU, there's no need to enable this feature
297 * which may cause unnecessary IOTLB miss/update trnasactions.
299 return vdev
->dma_as
!= &address_space_memory
&&
300 virtio_host_has_feature(vdev
, VIRTIO_F_IOMMU_PLATFORM
);
303 static void *vhost_memory_map(struct vhost_dev
*dev
, hwaddr addr
,
304 hwaddr
*plen
, bool is_write
)
306 if (!vhost_dev_has_iommu(dev
)) {
307 return cpu_physical_memory_map(addr
, plen
, is_write
);
309 return (void *)(uintptr_t)addr
;
313 static void vhost_memory_unmap(struct vhost_dev
*dev
, void *buffer
,
314 hwaddr len
, int is_write
,
317 if (!vhost_dev_has_iommu(dev
)) {
318 cpu_physical_memory_unmap(buffer
, len
, is_write
, access_len
);
322 static int vhost_verify_ring_part_mapping(void *ring_hva
,
329 uint64_t hva_ring_offset
;
330 uint64_t ring_last
= range_get_last(ring_gpa
, ring_size
);
331 uint64_t reg_last
= range_get_last(reg_gpa
, reg_size
);
333 if (ring_last
< reg_gpa
|| ring_gpa
> reg_last
) {
336 /* check that whole ring's is mapped */
337 if (ring_last
> reg_last
) {
340 /* check that ring's MemoryRegion wasn't replaced */
341 hva_ring_offset
= ring_gpa
- reg_gpa
;
342 if (ring_hva
!= reg_hva
+ hva_ring_offset
) {
349 static int vhost_verify_ring_mappings(struct vhost_dev
*dev
,
356 const char *part_name
[] = {
362 if (vhost_dev_has_iommu(dev
)) {
366 for (i
= 0; i
< dev
->nvqs
; ++i
) {
367 struct vhost_virtqueue
*vq
= dev
->vqs
+ i
;
369 if (vq
->desc_phys
== 0) {
374 r
= vhost_verify_ring_part_mapping(
375 vq
->desc
, vq
->desc_phys
, vq
->desc_size
,
376 reg_hva
, reg_gpa
, reg_size
);
382 r
= vhost_verify_ring_part_mapping(
383 vq
->avail
, vq
->avail_phys
, vq
->avail_size
,
384 reg_hva
, reg_gpa
, reg_size
);
390 r
= vhost_verify_ring_part_mapping(
391 vq
->used
, vq
->used_phys
, vq
->used_size
,
392 reg_hva
, reg_gpa
, reg_size
);
399 error_report("Unable to map %s for ring %d", part_name
[j
], i
);
400 } else if (r
== -EBUSY
) {
401 error_report("%s relocated for ring %d", part_name
[j
], i
);
406 static bool vhost_section(struct vhost_dev
*dev
, MemoryRegionSection
*section
)
409 bool log_dirty
= memory_region_get_dirty_log_mask(section
->mr
) &
410 ~(1 << DIRTY_MEMORY_MIGRATION
);
411 result
= memory_region_is_ram(section
->mr
) &&
412 !memory_region_is_rom(section
->mr
);
414 /* Vhost doesn't handle any block which is doing dirty-tracking other
415 * than migration; this typically fires on VGA areas.
417 result
&= !log_dirty
;
419 if (result
&& dev
->vhost_ops
->vhost_backend_mem_section_filter
) {
421 dev
->vhost_ops
->vhost_backend_mem_section_filter(dev
, section
);
424 trace_vhost_section(section
->mr
->name
, result
);
428 static void vhost_begin(MemoryListener
*listener
)
430 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
432 dev
->tmp_sections
= NULL
;
433 dev
->n_tmp_sections
= 0;
436 static void vhost_commit(MemoryListener
*listener
)
438 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
440 MemoryRegionSection
*old_sections
;
446 bool changed
= false;
448 /* Note we can be called before the device is started, but then
449 * starting the device calls set_mem_table, so we need to have
450 * built the data structures.
452 old_sections
= dev
->mem_sections
;
453 n_old_sections
= dev
->n_mem_sections
;
454 dev
->mem_sections
= dev
->tmp_sections
;
455 dev
->n_mem_sections
= dev
->n_tmp_sections
;
457 if (dev
->n_mem_sections
!= n_old_sections
) {
460 /* Same size, lets check the contents */
461 for (int i
= 0; i
< n_old_sections
; i
++) {
462 if (!MemoryRegionSection_eq(&old_sections
[i
],
463 &dev
->mem_sections
[i
])) {
470 trace_vhost_commit(dev
->started
, changed
);
475 /* Rebuild the regions list from the new sections list */
476 regions_size
= offsetof(struct vhost_memory
, regions
) +
477 dev
->n_mem_sections
* sizeof dev
->mem
->regions
[0];
478 dev
->mem
= g_realloc(dev
->mem
, regions_size
);
479 dev
->mem
->nregions
= dev
->n_mem_sections
;
480 used_memslots
= dev
->mem
->nregions
;
481 for (i
= 0; i
< dev
->n_mem_sections
; i
++) {
482 struct vhost_memory_region
*cur_vmr
= dev
->mem
->regions
+ i
;
483 struct MemoryRegionSection
*mrs
= dev
->mem_sections
+ i
;
485 cur_vmr
->guest_phys_addr
= mrs
->offset_within_address_space
;
486 cur_vmr
->memory_size
= int128_get64(mrs
->size
);
487 cur_vmr
->userspace_addr
=
488 (uintptr_t)memory_region_get_ram_ptr(mrs
->mr
) +
489 mrs
->offset_within_region
;
490 cur_vmr
->flags_padding
= 0;
497 for (i
= 0; i
< dev
->mem
->nregions
; i
++) {
498 if (vhost_verify_ring_mappings(dev
,
499 (void *)(uintptr_t)dev
->mem
->regions
[i
].userspace_addr
,
500 dev
->mem
->regions
[i
].guest_phys_addr
,
501 dev
->mem
->regions
[i
].memory_size
)) {
502 error_report("Verify ring failure on region %d", i
);
507 if (!dev
->log_enabled
) {
508 r
= dev
->vhost_ops
->vhost_set_mem_table(dev
, dev
->mem
);
510 VHOST_OPS_DEBUG("vhost_set_mem_table failed");
514 log_size
= vhost_get_log_size(dev
);
515 /* We allocate an extra 4K bytes to log,
516 * to reduce the * number of reallocations. */
517 #define VHOST_LOG_BUFFER (0x1000 / sizeof *dev->log)
518 /* To log more, must increase log size before table update. */
519 if (dev
->log_size
< log_size
) {
520 vhost_dev_log_resize(dev
, log_size
+ VHOST_LOG_BUFFER
);
522 r
= dev
->vhost_ops
->vhost_set_mem_table(dev
, dev
->mem
);
524 VHOST_OPS_DEBUG("vhost_set_mem_table failed");
526 /* To log less, can only decrease log size after table update. */
527 if (dev
->log_size
> log_size
+ VHOST_LOG_BUFFER
) {
528 vhost_dev_log_resize(dev
, log_size
);
532 /* Deref the old list of sections, this must happen _after_ the
533 * vhost_set_mem_table to ensure the client isn't still using the
534 * section we're about to unref.
536 while (n_old_sections
--) {
537 memory_region_unref(old_sections
[n_old_sections
].mr
);
539 g_free(old_sections
);
543 /* Adds the section data to the tmp_section structure.
544 * It relies on the listener calling us in memory address order
545 * and for each region (via the _add and _nop methods) to
548 static void vhost_region_add_section(struct vhost_dev
*dev
,
549 MemoryRegionSection
*section
)
551 bool need_add
= true;
552 uint64_t mrs_size
= int128_get64(section
->size
);
553 uint64_t mrs_gpa
= section
->offset_within_address_space
;
554 uintptr_t mrs_host
= (uintptr_t)memory_region_get_ram_ptr(section
->mr
) +
555 section
->offset_within_region
;
556 RAMBlock
*mrs_rb
= section
->mr
->ram_block
;
558 trace_vhost_region_add_section(section
->mr
->name
, mrs_gpa
, mrs_size
,
561 if (dev
->vhost_ops
->backend_type
== VHOST_BACKEND_TYPE_USER
) {
562 /* Round the section to it's page size */
563 /* First align the start down to a page boundary */
564 size_t mrs_page
= qemu_ram_pagesize(mrs_rb
);
565 uint64_t alignage
= mrs_host
& (mrs_page
- 1);
567 mrs_host
-= alignage
;
568 mrs_size
+= alignage
;
571 /* Now align the size up to a page boundary */
572 alignage
= mrs_size
& (mrs_page
- 1);
574 mrs_size
+= mrs_page
- alignage
;
576 trace_vhost_region_add_section_aligned(section
->mr
->name
, mrs_gpa
,
580 if (dev
->n_tmp_sections
) {
581 /* Since we already have at least one section, lets see if
582 * this extends it; since we're scanning in order, we only
583 * have to look at the last one, and the FlatView that calls
584 * us shouldn't have overlaps.
586 MemoryRegionSection
*prev_sec
= dev
->tmp_sections
+
587 (dev
->n_tmp_sections
- 1);
588 uint64_t prev_gpa_start
= prev_sec
->offset_within_address_space
;
589 uint64_t prev_size
= int128_get64(prev_sec
->size
);
590 uint64_t prev_gpa_end
= range_get_last(prev_gpa_start
, prev_size
);
591 uint64_t prev_host_start
=
592 (uintptr_t)memory_region_get_ram_ptr(prev_sec
->mr
) +
593 prev_sec
->offset_within_region
;
594 uint64_t prev_host_end
= range_get_last(prev_host_start
, prev_size
);
596 if (mrs_gpa
<= (prev_gpa_end
+ 1)) {
597 /* OK, looks like overlapping/intersecting - it's possible that
598 * the rounding to page sizes has made them overlap, but they should
599 * match up in the same RAMBlock if they do.
601 if (mrs_gpa
< prev_gpa_start
) {
602 error_report("%s:Section '%s' rounded to %"PRIx64
603 " prior to previous '%s' %"PRIx64
,
604 __func__
, section
->mr
->name
, mrs_gpa
,
605 prev_sec
->mr
->name
, prev_gpa_start
);
606 /* A way to cleanly fail here would be better */
609 /* Offset from the start of the previous GPA to this GPA */
610 size_t offset
= mrs_gpa
- prev_gpa_start
;
612 if (prev_host_start
+ offset
== mrs_host
&&
613 section
->mr
== prev_sec
->mr
&&
614 (!dev
->vhost_ops
->vhost_backend_can_merge
||
615 dev
->vhost_ops
->vhost_backend_can_merge(dev
,
617 prev_host_start
, prev_size
))) {
618 uint64_t max_end
= MAX(prev_host_end
, mrs_host
+ mrs_size
);
620 prev_sec
->offset_within_address_space
=
621 MIN(prev_gpa_start
, mrs_gpa
);
622 prev_sec
->offset_within_region
=
623 MIN(prev_host_start
, mrs_host
) -
624 (uintptr_t)memory_region_get_ram_ptr(prev_sec
->mr
);
625 prev_sec
->size
= int128_make64(max_end
- MIN(prev_host_start
,
627 trace_vhost_region_add_section_merge(section
->mr
->name
,
628 int128_get64(prev_sec
->size
),
629 prev_sec
->offset_within_address_space
,
630 prev_sec
->offset_within_region
);
632 /* adjoining regions are fine, but overlapping ones with
633 * different blocks/offsets shouldn't happen
635 if (mrs_gpa
!= prev_gpa_end
+ 1) {
636 error_report("%s: Overlapping but not coherent sections "
646 ++dev
->n_tmp_sections
;
647 dev
->tmp_sections
= g_renew(MemoryRegionSection
, dev
->tmp_sections
,
648 dev
->n_tmp_sections
);
649 dev
->tmp_sections
[dev
->n_tmp_sections
- 1] = *section
;
650 /* The flatview isn't stable and we don't use it, making it NULL
651 * means we can memcmp the list.
653 dev
->tmp_sections
[dev
->n_tmp_sections
- 1].fv
= NULL
;
654 memory_region_ref(section
->mr
);
658 /* Used for both add and nop callbacks */
659 static void vhost_region_addnop(MemoryListener
*listener
,
660 MemoryRegionSection
*section
)
662 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
665 if (!vhost_section(dev
, section
)) {
668 vhost_region_add_section(dev
, section
);
671 static void vhost_iommu_unmap_notify(IOMMUNotifier
*n
, IOMMUTLBEntry
*iotlb
)
673 struct vhost_iommu
*iommu
= container_of(n
, struct vhost_iommu
, n
);
674 struct vhost_dev
*hdev
= iommu
->hdev
;
675 hwaddr iova
= iotlb
->iova
+ iommu
->iommu_offset
;
677 if (vhost_backend_invalidate_device_iotlb(hdev
, iova
,
678 iotlb
->addr_mask
+ 1)) {
679 error_report("Fail to invalidate device iotlb");
683 static void vhost_iommu_region_add(MemoryListener
*listener
,
684 MemoryRegionSection
*section
)
686 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
688 struct vhost_iommu
*iommu
;
691 IOMMUMemoryRegion
*iommu_mr
;
694 if (!memory_region_is_iommu(section
->mr
)) {
698 iommu_mr
= IOMMU_MEMORY_REGION(section
->mr
);
700 iommu
= g_malloc0(sizeof(*iommu
));
701 end
= int128_add(int128_make64(section
->offset_within_region
),
703 end
= int128_sub(end
, int128_one());
704 iommu_idx
= memory_region_iommu_attrs_to_index(iommu_mr
,
705 MEMTXATTRS_UNSPECIFIED
);
706 iommu_notifier_init(&iommu
->n
, vhost_iommu_unmap_notify
,
707 IOMMU_NOTIFIER_UNMAP
,
708 section
->offset_within_region
,
711 iommu
->mr
= section
->mr
;
712 iommu
->iommu_offset
= section
->offset_within_address_space
-
713 section
->offset_within_region
;
715 ret
= memory_region_register_iommu_notifier(section
->mr
, &iommu
->n
, &err
);
717 error_report_err(err
);
720 QLIST_INSERT_HEAD(&dev
->iommu_list
, iommu
, iommu_next
);
721 /* TODO: can replay help performance here? */
724 static void vhost_iommu_region_del(MemoryListener
*listener
,
725 MemoryRegionSection
*section
)
727 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
729 struct vhost_iommu
*iommu
;
731 if (!memory_region_is_iommu(section
->mr
)) {
735 QLIST_FOREACH(iommu
, &dev
->iommu_list
, iommu_next
) {
736 if (iommu
->mr
== section
->mr
&&
737 iommu
->n
.start
== section
->offset_within_region
) {
738 memory_region_unregister_iommu_notifier(iommu
->mr
,
740 QLIST_REMOVE(iommu
, iommu_next
);
747 static int vhost_virtqueue_set_addr(struct vhost_dev
*dev
,
748 struct vhost_virtqueue
*vq
,
749 unsigned idx
, bool enable_log
)
751 struct vhost_vring_addr addr
= {
753 .desc_user_addr
= (uint64_t)(unsigned long)vq
->desc
,
754 .avail_user_addr
= (uint64_t)(unsigned long)vq
->avail
,
755 .used_user_addr
= (uint64_t)(unsigned long)vq
->used
,
756 .log_guest_addr
= vq
->used_phys
,
757 .flags
= enable_log
? (1 << VHOST_VRING_F_LOG
) : 0,
759 int r
= dev
->vhost_ops
->vhost_set_vring_addr(dev
, &addr
);
761 VHOST_OPS_DEBUG("vhost_set_vring_addr failed");
767 static int vhost_dev_set_features(struct vhost_dev
*dev
,
770 uint64_t features
= dev
->acked_features
;
773 features
|= 0x1ULL
<< VHOST_F_LOG_ALL
;
775 if (!vhost_dev_has_iommu(dev
)) {
776 features
&= ~(0x1ULL
<< VIRTIO_F_IOMMU_PLATFORM
);
778 r
= dev
->vhost_ops
->vhost_set_features(dev
, features
);
780 VHOST_OPS_DEBUG("vhost_set_features failed");
782 return r
< 0 ? -errno
: 0;
785 static int vhost_dev_set_log(struct vhost_dev
*dev
, bool enable_log
)
788 r
= vhost_dev_set_features(dev
, enable_log
);
792 for (i
= 0; i
< dev
->nvqs
; ++i
) {
793 idx
= dev
->vhost_ops
->vhost_get_vq_index(dev
, dev
->vq_index
+ i
);
794 r
= vhost_virtqueue_set_addr(dev
, dev
->vqs
+ i
, idx
,
802 for (; i
>= 0; --i
) {
803 idx
= dev
->vhost_ops
->vhost_get_vq_index(dev
, dev
->vq_index
+ i
);
804 vhost_virtqueue_set_addr(dev
, dev
->vqs
+ i
, idx
,
807 vhost_dev_set_features(dev
, dev
->log_enabled
);
812 static int vhost_migration_log(MemoryListener
*listener
, int enable
)
814 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
817 if (!!enable
== dev
->log_enabled
) {
821 dev
->log_enabled
= enable
;
825 r
= vhost_dev_set_log(dev
, false);
829 vhost_log_put(dev
, false);
831 vhost_dev_log_resize(dev
, vhost_get_log_size(dev
));
832 r
= vhost_dev_set_log(dev
, true);
837 dev
->log_enabled
= enable
;
841 static void vhost_log_global_start(MemoryListener
*listener
)
845 r
= vhost_migration_log(listener
, true);
851 static void vhost_log_global_stop(MemoryListener
*listener
)
855 r
= vhost_migration_log(listener
, false);
861 static void vhost_log_start(MemoryListener
*listener
,
862 MemoryRegionSection
*section
,
865 /* FIXME: implement */
868 static void vhost_log_stop(MemoryListener
*listener
,
869 MemoryRegionSection
*section
,
872 /* FIXME: implement */
875 /* The vhost driver natively knows how to handle the vrings of non
876 * cross-endian legacy devices and modern devices. Only legacy devices
877 * exposed to a bi-endian guest may require the vhost driver to use a
878 * specific endianness.
880 static inline bool vhost_needs_vring_endian(VirtIODevice
*vdev
)
882 if (virtio_vdev_has_feature(vdev
, VIRTIO_F_VERSION_1
)) {
885 #ifdef HOST_WORDS_BIGENDIAN
886 return vdev
->device_endian
== VIRTIO_DEVICE_ENDIAN_LITTLE
;
888 return vdev
->device_endian
== VIRTIO_DEVICE_ENDIAN_BIG
;
892 static int vhost_virtqueue_set_vring_endian_legacy(struct vhost_dev
*dev
,
896 struct vhost_vring_state s
= {
897 .index
= vhost_vq_index
,
901 if (!dev
->vhost_ops
->vhost_set_vring_endian(dev
, &s
)) {
905 VHOST_OPS_DEBUG("vhost_set_vring_endian failed");
906 if (errno
== ENOTTY
) {
907 error_report("vhost does not support cross-endian");
914 static int vhost_memory_region_lookup(struct vhost_dev
*hdev
,
915 uint64_t gpa
, uint64_t *uaddr
,
920 for (i
= 0; i
< hdev
->mem
->nregions
; i
++) {
921 struct vhost_memory_region
*reg
= hdev
->mem
->regions
+ i
;
923 if (gpa
>= reg
->guest_phys_addr
&&
924 reg
->guest_phys_addr
+ reg
->memory_size
> gpa
) {
925 *uaddr
= reg
->userspace_addr
+ gpa
- reg
->guest_phys_addr
;
926 *len
= reg
->guest_phys_addr
+ reg
->memory_size
- gpa
;
934 int vhost_device_iotlb_miss(struct vhost_dev
*dev
, uint64_t iova
, int write
)
940 RCU_READ_LOCK_GUARD();
942 trace_vhost_iotlb_miss(dev
, 1);
944 iotlb
= address_space_get_iotlb_entry(dev
->vdev
->dma_as
,
946 MEMTXATTRS_UNSPECIFIED
);
947 if (iotlb
.target_as
!= NULL
) {
948 ret
= vhost_memory_region_lookup(dev
, iotlb
.translated_addr
,
951 trace_vhost_iotlb_miss(dev
, 3);
952 error_report("Fail to lookup the translated address "
953 "%"PRIx64
, iotlb
.translated_addr
);
957 len
= MIN(iotlb
.addr_mask
+ 1, len
);
958 iova
= iova
& ~iotlb
.addr_mask
;
960 ret
= vhost_backend_update_device_iotlb(dev
, iova
, uaddr
,
963 trace_vhost_iotlb_miss(dev
, 4);
964 error_report("Fail to update device iotlb");
969 trace_vhost_iotlb_miss(dev
, 2);
975 static int vhost_virtqueue_start(struct vhost_dev
*dev
,
976 struct VirtIODevice
*vdev
,
977 struct vhost_virtqueue
*vq
,
980 BusState
*qbus
= BUS(qdev_get_parent_bus(DEVICE(vdev
)));
981 VirtioBusState
*vbus
= VIRTIO_BUS(qbus
);
982 VirtioBusClass
*k
= VIRTIO_BUS_GET_CLASS(vbus
);
985 int vhost_vq_index
= dev
->vhost_ops
->vhost_get_vq_index(dev
, idx
);
986 struct vhost_vring_file file
= {
987 .index
= vhost_vq_index
989 struct vhost_vring_state state
= {
990 .index
= vhost_vq_index
992 struct VirtQueue
*vvq
= virtio_get_queue(vdev
, idx
);
994 a
= virtio_queue_get_desc_addr(vdev
, idx
);
996 /* Queue might not be ready for start */
1000 vq
->num
= state
.num
= virtio_queue_get_num(vdev
, idx
);
1001 r
= dev
->vhost_ops
->vhost_set_vring_num(dev
, &state
);
1003 VHOST_OPS_DEBUG("vhost_set_vring_num failed");
1007 state
.num
= virtio_queue_get_last_avail_idx(vdev
, idx
);
1008 r
= dev
->vhost_ops
->vhost_set_vring_base(dev
, &state
);
1010 VHOST_OPS_DEBUG("vhost_set_vring_base failed");
1014 if (vhost_needs_vring_endian(vdev
)) {
1015 r
= vhost_virtqueue_set_vring_endian_legacy(dev
,
1016 virtio_is_big_endian(vdev
),
1023 vq
->desc_size
= s
= l
= virtio_queue_get_desc_size(vdev
, idx
);
1025 vq
->desc
= vhost_memory_map(dev
, a
, &l
, false);
1026 if (!vq
->desc
|| l
!= s
) {
1028 goto fail_alloc_desc
;
1030 vq
->avail_size
= s
= l
= virtio_queue_get_avail_size(vdev
, idx
);
1031 vq
->avail_phys
= a
= virtio_queue_get_avail_addr(vdev
, idx
);
1032 vq
->avail
= vhost_memory_map(dev
, a
, &l
, false);
1033 if (!vq
->avail
|| l
!= s
) {
1035 goto fail_alloc_avail
;
1037 vq
->used_size
= s
= l
= virtio_queue_get_used_size(vdev
, idx
);
1038 vq
->used_phys
= a
= virtio_queue_get_used_addr(vdev
, idx
);
1039 vq
->used
= vhost_memory_map(dev
, a
, &l
, true);
1040 if (!vq
->used
|| l
!= s
) {
1042 goto fail_alloc_used
;
1045 r
= vhost_virtqueue_set_addr(dev
, vq
, vhost_vq_index
, dev
->log_enabled
);
1051 file
.fd
= event_notifier_get_fd(virtio_queue_get_host_notifier(vvq
));
1052 r
= dev
->vhost_ops
->vhost_set_vring_kick(dev
, &file
);
1054 VHOST_OPS_DEBUG("vhost_set_vring_kick failed");
1059 /* Clear and discard previous events if any. */
1060 event_notifier_test_and_clear(&vq
->masked_notifier
);
1062 /* Init vring in unmasked state, unless guest_notifier_mask
1065 if (!vdev
->use_guest_notifier_mask
) {
1066 /* TODO: check and handle errors. */
1067 vhost_virtqueue_mask(dev
, vdev
, idx
, false);
1070 if (k
->query_guest_notifiers
&&
1071 k
->query_guest_notifiers(qbus
->parent
) &&
1072 virtio_queue_vector(vdev
, idx
) == VIRTIO_NO_VECTOR
) {
1074 r
= dev
->vhost_ops
->vhost_set_vring_call(dev
, &file
);
1085 vhost_memory_unmap(dev
, vq
->used
, virtio_queue_get_used_size(vdev
, idx
),
1088 vhost_memory_unmap(dev
, vq
->avail
, virtio_queue_get_avail_size(vdev
, idx
),
1091 vhost_memory_unmap(dev
, vq
->desc
, virtio_queue_get_desc_size(vdev
, idx
),
1097 static void vhost_virtqueue_stop(struct vhost_dev
*dev
,
1098 struct VirtIODevice
*vdev
,
1099 struct vhost_virtqueue
*vq
,
1102 int vhost_vq_index
= dev
->vhost_ops
->vhost_get_vq_index(dev
, idx
);
1103 struct vhost_vring_state state
= {
1104 .index
= vhost_vq_index
,
1108 if (virtio_queue_get_desc_addr(vdev
, idx
) == 0) {
1109 /* Don't stop the virtqueue which might have not been started */
1113 r
= dev
->vhost_ops
->vhost_get_vring_base(dev
, &state
);
1115 VHOST_OPS_DEBUG("vhost VQ %u ring restore failed: %d", idx
, r
);
1116 /* Connection to the backend is broken, so let's sync internal
1117 * last avail idx to the device used idx.
1119 virtio_queue_restore_last_avail_idx(vdev
, idx
);
1121 virtio_queue_set_last_avail_idx(vdev
, idx
, state
.num
);
1123 virtio_queue_invalidate_signalled_used(vdev
, idx
);
1124 virtio_queue_update_used_idx(vdev
, idx
);
1126 /* In the cross-endian case, we need to reset the vring endianness to
1127 * native as legacy devices expect so by default.
1129 if (vhost_needs_vring_endian(vdev
)) {
1130 vhost_virtqueue_set_vring_endian_legacy(dev
,
1131 !virtio_is_big_endian(vdev
),
1135 vhost_memory_unmap(dev
, vq
->used
, virtio_queue_get_used_size(vdev
, idx
),
1136 1, virtio_queue_get_used_size(vdev
, idx
));
1137 vhost_memory_unmap(dev
, vq
->avail
, virtio_queue_get_avail_size(vdev
, idx
),
1138 0, virtio_queue_get_avail_size(vdev
, idx
));
1139 vhost_memory_unmap(dev
, vq
->desc
, virtio_queue_get_desc_size(vdev
, idx
),
1140 0, virtio_queue_get_desc_size(vdev
, idx
));
1143 static void vhost_eventfd_add(MemoryListener
*listener
,
1144 MemoryRegionSection
*section
,
1145 bool match_data
, uint64_t data
, EventNotifier
*e
)
1149 static void vhost_eventfd_del(MemoryListener
*listener
,
1150 MemoryRegionSection
*section
,
1151 bool match_data
, uint64_t data
, EventNotifier
*e
)
1155 static int vhost_virtqueue_set_busyloop_timeout(struct vhost_dev
*dev
,
1156 int n
, uint32_t timeout
)
1158 int vhost_vq_index
= dev
->vhost_ops
->vhost_get_vq_index(dev
, n
);
1159 struct vhost_vring_state state
= {
1160 .index
= vhost_vq_index
,
1165 if (!dev
->vhost_ops
->vhost_set_vring_busyloop_timeout
) {
1169 r
= dev
->vhost_ops
->vhost_set_vring_busyloop_timeout(dev
, &state
);
1171 VHOST_OPS_DEBUG("vhost_set_vring_busyloop_timeout failed");
1178 static int vhost_virtqueue_init(struct vhost_dev
*dev
,
1179 struct vhost_virtqueue
*vq
, int n
)
1181 int vhost_vq_index
= dev
->vhost_ops
->vhost_get_vq_index(dev
, n
);
1182 struct vhost_vring_file file
= {
1183 .index
= vhost_vq_index
,
1185 int r
= event_notifier_init(&vq
->masked_notifier
, 0);
1190 file
.fd
= event_notifier_get_fd(&vq
->masked_notifier
);
1191 r
= dev
->vhost_ops
->vhost_set_vring_call(dev
, &file
);
1193 VHOST_OPS_DEBUG("vhost_set_vring_call failed");
1202 event_notifier_cleanup(&vq
->masked_notifier
);
1206 static void vhost_virtqueue_cleanup(struct vhost_virtqueue
*vq
)
1208 event_notifier_cleanup(&vq
->masked_notifier
);
1211 int vhost_dev_init(struct vhost_dev
*hdev
, void *opaque
,
1212 VhostBackendType backend_type
, uint32_t busyloop_timeout
)
1215 int i
, r
, n_initialized_vqs
= 0;
1216 Error
*local_err
= NULL
;
1219 hdev
->migration_blocker
= NULL
;
1221 r
= vhost_set_backend_type(hdev
, backend_type
);
1224 r
= hdev
->vhost_ops
->vhost_backend_init(hdev
, opaque
);
1229 r
= hdev
->vhost_ops
->vhost_set_owner(hdev
);
1231 VHOST_OPS_DEBUG("vhost_set_owner failed");
1235 r
= hdev
->vhost_ops
->vhost_get_features(hdev
, &features
);
1237 VHOST_OPS_DEBUG("vhost_get_features failed");
1241 for (i
= 0; i
< hdev
->nvqs
; ++i
, ++n_initialized_vqs
) {
1242 r
= vhost_virtqueue_init(hdev
, hdev
->vqs
+ i
, hdev
->vq_index
+ i
);
1248 if (busyloop_timeout
) {
1249 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1250 r
= vhost_virtqueue_set_busyloop_timeout(hdev
, hdev
->vq_index
+ i
,
1258 hdev
->features
= features
;
1260 hdev
->memory_listener
= (MemoryListener
) {
1261 .begin
= vhost_begin
,
1262 .commit
= vhost_commit
,
1263 .region_add
= vhost_region_addnop
,
1264 .region_nop
= vhost_region_addnop
,
1265 .log_start
= vhost_log_start
,
1266 .log_stop
= vhost_log_stop
,
1267 .log_sync
= vhost_log_sync
,
1268 .log_global_start
= vhost_log_global_start
,
1269 .log_global_stop
= vhost_log_global_stop
,
1270 .eventfd_add
= vhost_eventfd_add
,
1271 .eventfd_del
= vhost_eventfd_del
,
1275 hdev
->iommu_listener
= (MemoryListener
) {
1276 .region_add
= vhost_iommu_region_add
,
1277 .region_del
= vhost_iommu_region_del
,
1280 if (hdev
->migration_blocker
== NULL
) {
1281 if (!(hdev
->features
& (0x1ULL
<< VHOST_F_LOG_ALL
))) {
1282 error_setg(&hdev
->migration_blocker
,
1283 "Migration disabled: vhost lacks VHOST_F_LOG_ALL feature.");
1284 } else if (vhost_dev_log_is_shared(hdev
) && !qemu_memfd_alloc_check()) {
1285 error_setg(&hdev
->migration_blocker
,
1286 "Migration disabled: failed to allocate shared memory");
1290 if (hdev
->migration_blocker
!= NULL
) {
1291 r
= migrate_add_blocker(hdev
->migration_blocker
, &local_err
);
1293 error_report_err(local_err
);
1294 error_free(hdev
->migration_blocker
);
1299 hdev
->mem
= g_malloc0(offsetof(struct vhost_memory
, regions
));
1300 hdev
->n_mem_sections
= 0;
1301 hdev
->mem_sections
= NULL
;
1304 hdev
->log_enabled
= false;
1305 hdev
->started
= false;
1306 memory_listener_register(&hdev
->memory_listener
, &address_space_memory
);
1307 QLIST_INSERT_HEAD(&vhost_devices
, hdev
, entry
);
1309 if (used_memslots
> hdev
->vhost_ops
->vhost_backend_memslots_limit(hdev
)) {
1310 error_report("vhost backend memory slots limit is less"
1311 " than current number of present memory slots");
1313 if (busyloop_timeout
) {
1324 vhost_virtqueue_set_busyloop_timeout(hdev
, hdev
->vq_index
+ i
, 0);
1327 hdev
->nvqs
= n_initialized_vqs
;
1328 vhost_dev_cleanup(hdev
);
1332 void vhost_dev_cleanup(struct vhost_dev
*hdev
)
1336 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1337 vhost_virtqueue_cleanup(hdev
->vqs
+ i
);
1340 /* those are only safe after successful init */
1341 memory_listener_unregister(&hdev
->memory_listener
);
1342 QLIST_REMOVE(hdev
, entry
);
1344 if (hdev
->migration_blocker
) {
1345 migrate_del_blocker(hdev
->migration_blocker
);
1346 error_free(hdev
->migration_blocker
);
1349 g_free(hdev
->mem_sections
);
1350 if (hdev
->vhost_ops
) {
1351 hdev
->vhost_ops
->vhost_backend_cleanup(hdev
);
1355 memset(hdev
, 0, sizeof(struct vhost_dev
));
1358 /* Stop processing guest IO notifications in qemu.
1359 * Start processing them in vhost in kernel.
1361 int vhost_dev_enable_notifiers(struct vhost_dev
*hdev
, VirtIODevice
*vdev
)
1363 BusState
*qbus
= BUS(qdev_get_parent_bus(DEVICE(vdev
)));
1366 /* We will pass the notifiers to the kernel, make sure that QEMU
1367 * doesn't interfere.
1369 r
= virtio_device_grab_ioeventfd(vdev
);
1371 error_report("binding does not support host notifiers");
1375 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1376 r
= virtio_bus_set_host_notifier(VIRTIO_BUS(qbus
), hdev
->vq_index
+ i
,
1379 error_report("vhost VQ %d notifier binding failed: %d", i
, -r
);
1387 e
= virtio_bus_set_host_notifier(VIRTIO_BUS(qbus
), hdev
->vq_index
+ i
,
1390 error_report("vhost VQ %d notifier cleanup error: %d", i
, -r
);
1393 virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus
), hdev
->vq_index
+ i
);
1395 virtio_device_release_ioeventfd(vdev
);
1400 /* Stop processing guest IO notifications in vhost.
1401 * Start processing them in qemu.
1402 * This might actually run the qemu handlers right away,
1403 * so virtio in qemu must be completely setup when this is called.
1405 void vhost_dev_disable_notifiers(struct vhost_dev
*hdev
, VirtIODevice
*vdev
)
1407 BusState
*qbus
= BUS(qdev_get_parent_bus(DEVICE(vdev
)));
1410 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1411 r
= virtio_bus_set_host_notifier(VIRTIO_BUS(qbus
), hdev
->vq_index
+ i
,
1414 error_report("vhost VQ %d notifier cleanup failed: %d", i
, -r
);
1417 virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus
), hdev
->vq_index
+ i
);
1419 virtio_device_release_ioeventfd(vdev
);
1422 /* Test and clear event pending status.
1423 * Should be called after unmask to avoid losing events.
1425 bool vhost_virtqueue_pending(struct vhost_dev
*hdev
, int n
)
1427 struct vhost_virtqueue
*vq
= hdev
->vqs
+ n
- hdev
->vq_index
;
1428 assert(n
>= hdev
->vq_index
&& n
< hdev
->vq_index
+ hdev
->nvqs
);
1429 return event_notifier_test_and_clear(&vq
->masked_notifier
);
1432 /* Mask/unmask events from this vq. */
1433 void vhost_virtqueue_mask(struct vhost_dev
*hdev
, VirtIODevice
*vdev
, int n
,
1436 struct VirtQueue
*vvq
= virtio_get_queue(vdev
, n
);
1437 int r
, index
= n
- hdev
->vq_index
;
1438 struct vhost_vring_file file
;
1440 /* should only be called after backend is connected */
1441 assert(hdev
->vhost_ops
);
1444 assert(vdev
->use_guest_notifier_mask
);
1445 file
.fd
= event_notifier_get_fd(&hdev
->vqs
[index
].masked_notifier
);
1447 file
.fd
= event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq
));
1450 file
.index
= hdev
->vhost_ops
->vhost_get_vq_index(hdev
, n
);
1451 r
= hdev
->vhost_ops
->vhost_set_vring_call(hdev
, &file
);
1453 VHOST_OPS_DEBUG("vhost_set_vring_call failed");
1457 uint64_t vhost_get_features(struct vhost_dev
*hdev
, const int *feature_bits
,
1460 const int *bit
= feature_bits
;
1461 while (*bit
!= VHOST_INVALID_FEATURE_BIT
) {
1462 uint64_t bit_mask
= (1ULL << *bit
);
1463 if (!(hdev
->features
& bit_mask
)) {
1464 features
&= ~bit_mask
;
1471 void vhost_ack_features(struct vhost_dev
*hdev
, const int *feature_bits
,
1474 const int *bit
= feature_bits
;
1475 while (*bit
!= VHOST_INVALID_FEATURE_BIT
) {
1476 uint64_t bit_mask
= (1ULL << *bit
);
1477 if (features
& bit_mask
) {
1478 hdev
->acked_features
|= bit_mask
;
1484 int vhost_dev_get_config(struct vhost_dev
*hdev
, uint8_t *config
,
1485 uint32_t config_len
)
1487 assert(hdev
->vhost_ops
);
1489 if (hdev
->vhost_ops
->vhost_get_config
) {
1490 return hdev
->vhost_ops
->vhost_get_config(hdev
, config
, config_len
);
1496 int vhost_dev_set_config(struct vhost_dev
*hdev
, const uint8_t *data
,
1497 uint32_t offset
, uint32_t size
, uint32_t flags
)
1499 assert(hdev
->vhost_ops
);
1501 if (hdev
->vhost_ops
->vhost_set_config
) {
1502 return hdev
->vhost_ops
->vhost_set_config(hdev
, data
, offset
,
1509 void vhost_dev_set_config_notifier(struct vhost_dev
*hdev
,
1510 const VhostDevConfigOps
*ops
)
1512 hdev
->config_ops
= ops
;
1515 void vhost_dev_free_inflight(struct vhost_inflight
*inflight
)
1517 if (inflight
&& inflight
->addr
) {
1518 qemu_memfd_free(inflight
->addr
, inflight
->size
, inflight
->fd
);
1519 inflight
->addr
= NULL
;
1524 static int vhost_dev_resize_inflight(struct vhost_inflight
*inflight
,
1529 void *addr
= qemu_memfd_alloc("vhost-inflight", new_size
,
1530 F_SEAL_GROW
| F_SEAL_SHRINK
| F_SEAL_SEAL
,
1534 error_report_err(err
);
1538 vhost_dev_free_inflight(inflight
);
1539 inflight
->offset
= 0;
1540 inflight
->addr
= addr
;
1542 inflight
->size
= new_size
;
1547 void vhost_dev_save_inflight(struct vhost_inflight
*inflight
, QEMUFile
*f
)
1549 if (inflight
->addr
) {
1550 qemu_put_be64(f
, inflight
->size
);
1551 qemu_put_be16(f
, inflight
->queue_size
);
1552 qemu_put_buffer(f
, inflight
->addr
, inflight
->size
);
1554 qemu_put_be64(f
, 0);
1558 int vhost_dev_load_inflight(struct vhost_inflight
*inflight
, QEMUFile
*f
)
1562 size
= qemu_get_be64(f
);
1567 if (inflight
->size
!= size
) {
1568 if (vhost_dev_resize_inflight(inflight
, size
)) {
1572 inflight
->queue_size
= qemu_get_be16(f
);
1574 qemu_get_buffer(f
, inflight
->addr
, size
);
1579 int vhost_dev_set_inflight(struct vhost_dev
*dev
,
1580 struct vhost_inflight
*inflight
)
1584 if (dev
->vhost_ops
->vhost_set_inflight_fd
&& inflight
->addr
) {
1585 r
= dev
->vhost_ops
->vhost_set_inflight_fd(dev
, inflight
);
1587 VHOST_OPS_DEBUG("vhost_set_inflight_fd failed");
1595 int vhost_dev_get_inflight(struct vhost_dev
*dev
, uint16_t queue_size
,
1596 struct vhost_inflight
*inflight
)
1600 if (dev
->vhost_ops
->vhost_get_inflight_fd
) {
1601 r
= dev
->vhost_ops
->vhost_get_inflight_fd(dev
, queue_size
, inflight
);
1603 VHOST_OPS_DEBUG("vhost_get_inflight_fd failed");
1611 /* Host notifiers must be enabled at this point. */
1612 int vhost_dev_start(struct vhost_dev
*hdev
, VirtIODevice
*vdev
)
1616 /* should only be called after backend is connected */
1617 assert(hdev
->vhost_ops
);
1619 hdev
->started
= true;
1622 r
= vhost_dev_set_features(hdev
, hdev
->log_enabled
);
1627 if (vhost_dev_has_iommu(hdev
)) {
1628 memory_listener_register(&hdev
->iommu_listener
, vdev
->dma_as
);
1631 r
= hdev
->vhost_ops
->vhost_set_mem_table(hdev
, hdev
->mem
);
1633 VHOST_OPS_DEBUG("vhost_set_mem_table failed");
1637 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1638 r
= vhost_virtqueue_start(hdev
,
1641 hdev
->vq_index
+ i
);
1647 if (hdev
->log_enabled
) {
1650 hdev
->log_size
= vhost_get_log_size(hdev
);
1651 hdev
->log
= vhost_log_get(hdev
->log_size
,
1652 vhost_dev_log_is_shared(hdev
));
1653 log_base
= (uintptr_t)hdev
->log
->log
;
1654 r
= hdev
->vhost_ops
->vhost_set_log_base(hdev
,
1655 hdev
->log_size
? log_base
: 0,
1658 VHOST_OPS_DEBUG("vhost_set_log_base failed");
1664 if (vhost_dev_has_iommu(hdev
)) {
1665 hdev
->vhost_ops
->vhost_set_iotlb_callback(hdev
, true);
1667 /* Update used ring information for IOTLB to work correctly,
1668 * vhost-kernel code requires for this.*/
1669 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1670 struct vhost_virtqueue
*vq
= hdev
->vqs
+ i
;
1671 vhost_device_iotlb_miss(hdev
, vq
->used_phys
, true);
1676 vhost_log_put(hdev
, false);
1679 vhost_virtqueue_stop(hdev
,
1682 hdev
->vq_index
+ i
);
1688 hdev
->started
= false;
1692 /* Host notifiers must be enabled at this point. */
1693 void vhost_dev_stop(struct vhost_dev
*hdev
, VirtIODevice
*vdev
)
1697 /* should only be called after backend is connected */
1698 assert(hdev
->vhost_ops
);
1700 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1701 vhost_virtqueue_stop(hdev
,
1704 hdev
->vq_index
+ i
);
1707 if (vhost_dev_has_iommu(hdev
)) {
1708 hdev
->vhost_ops
->vhost_set_iotlb_callback(hdev
, false);
1709 memory_listener_unregister(&hdev
->iommu_listener
);
1711 vhost_log_put(hdev
, true);
1712 hdev
->started
= false;
1716 int vhost_net_set_backend(struct vhost_dev
*hdev
,
1717 struct vhost_vring_file
*file
)
1719 if (hdev
->vhost_ops
->vhost_net_set_backend
) {
1720 return hdev
->vhost_ops
->vhost_net_set_backend(hdev
, file
);