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
;
293 return virtio_host_has_feature(vdev
, VIRTIO_F_IOMMU_PLATFORM
);
296 static void *vhost_memory_map(struct vhost_dev
*dev
, hwaddr addr
,
297 hwaddr
*plen
, int is_write
)
299 if (!vhost_dev_has_iommu(dev
)) {
300 return cpu_physical_memory_map(addr
, plen
, is_write
);
302 return (void *)(uintptr_t)addr
;
306 static void vhost_memory_unmap(struct vhost_dev
*dev
, void *buffer
,
307 hwaddr len
, int is_write
,
310 if (!vhost_dev_has_iommu(dev
)) {
311 cpu_physical_memory_unmap(buffer
, len
, is_write
, access_len
);
315 static int vhost_verify_ring_part_mapping(void *ring_hva
,
322 uint64_t hva_ring_offset
;
323 uint64_t ring_last
= range_get_last(ring_gpa
, ring_size
);
324 uint64_t reg_last
= range_get_last(reg_gpa
, reg_size
);
326 if (ring_last
< reg_gpa
|| ring_gpa
> reg_last
) {
329 /* check that whole ring's is mapped */
330 if (ring_last
> reg_last
) {
333 /* check that ring's MemoryRegion wasn't replaced */
334 hva_ring_offset
= ring_gpa
- reg_gpa
;
335 if (ring_hva
!= reg_hva
+ hva_ring_offset
) {
342 static int vhost_verify_ring_mappings(struct vhost_dev
*dev
,
349 const char *part_name
[] = {
355 if (vhost_dev_has_iommu(dev
)) {
359 for (i
= 0; i
< dev
->nvqs
; ++i
) {
360 struct vhost_virtqueue
*vq
= dev
->vqs
+ i
;
362 if (vq
->desc_phys
== 0) {
367 r
= vhost_verify_ring_part_mapping(
368 vq
->desc
, vq
->desc_phys
, vq
->desc_size
,
369 reg_hva
, reg_gpa
, reg_size
);
375 r
= vhost_verify_ring_part_mapping(
376 vq
->avail
, vq
->avail_phys
, vq
->avail_size
,
377 reg_hva
, reg_gpa
, reg_size
);
383 r
= vhost_verify_ring_part_mapping(
384 vq
->used
, vq
->used_phys
, vq
->used_size
,
385 reg_hva
, reg_gpa
, reg_size
);
392 error_report("Unable to map %s for ring %d", part_name
[j
], i
);
393 } else if (r
== -EBUSY
) {
394 error_report("%s relocated for ring %d", part_name
[j
], i
);
399 static bool vhost_section(struct vhost_dev
*dev
, MemoryRegionSection
*section
)
402 bool log_dirty
= memory_region_get_dirty_log_mask(section
->mr
) &
403 ~(1 << DIRTY_MEMORY_MIGRATION
);
404 result
= memory_region_is_ram(section
->mr
) &&
405 !memory_region_is_rom(section
->mr
);
407 /* Vhost doesn't handle any block which is doing dirty-tracking other
408 * than migration; this typically fires on VGA areas.
410 result
&= !log_dirty
;
412 if (result
&& dev
->vhost_ops
->vhost_backend_mem_section_filter
) {
414 dev
->vhost_ops
->vhost_backend_mem_section_filter(dev
, section
);
417 trace_vhost_section(section
->mr
->name
, result
);
421 static void vhost_begin(MemoryListener
*listener
)
423 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
425 dev
->tmp_sections
= NULL
;
426 dev
->n_tmp_sections
= 0;
429 static void vhost_commit(MemoryListener
*listener
)
431 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
433 MemoryRegionSection
*old_sections
;
439 bool changed
= false;
441 /* Note we can be called before the device is started, but then
442 * starting the device calls set_mem_table, so we need to have
443 * built the data structures.
445 old_sections
= dev
->mem_sections
;
446 n_old_sections
= dev
->n_mem_sections
;
447 dev
->mem_sections
= dev
->tmp_sections
;
448 dev
->n_mem_sections
= dev
->n_tmp_sections
;
450 if (dev
->n_mem_sections
!= n_old_sections
) {
453 /* Same size, lets check the contents */
454 for (int i
= 0; i
< n_old_sections
; i
++) {
455 if (!MemoryRegionSection_eq(&old_sections
[i
],
456 &dev
->mem_sections
[i
])) {
463 trace_vhost_commit(dev
->started
, changed
);
468 /* Rebuild the regions list from the new sections list */
469 regions_size
= offsetof(struct vhost_memory
, regions
) +
470 dev
->n_mem_sections
* sizeof dev
->mem
->regions
[0];
471 dev
->mem
= g_realloc(dev
->mem
, regions_size
);
472 dev
->mem
->nregions
= dev
->n_mem_sections
;
473 used_memslots
= dev
->mem
->nregions
;
474 for (i
= 0; i
< dev
->n_mem_sections
; i
++) {
475 struct vhost_memory_region
*cur_vmr
= dev
->mem
->regions
+ i
;
476 struct MemoryRegionSection
*mrs
= dev
->mem_sections
+ i
;
478 cur_vmr
->guest_phys_addr
= mrs
->offset_within_address_space
;
479 cur_vmr
->memory_size
= int128_get64(mrs
->size
);
480 cur_vmr
->userspace_addr
=
481 (uintptr_t)memory_region_get_ram_ptr(mrs
->mr
) +
482 mrs
->offset_within_region
;
483 cur_vmr
->flags_padding
= 0;
490 for (i
= 0; i
< dev
->mem
->nregions
; i
++) {
491 if (vhost_verify_ring_mappings(dev
,
492 (void *)(uintptr_t)dev
->mem
->regions
[i
].userspace_addr
,
493 dev
->mem
->regions
[i
].guest_phys_addr
,
494 dev
->mem
->regions
[i
].memory_size
)) {
495 error_report("Verify ring failure on region %d", i
);
500 if (!dev
->log_enabled
) {
501 r
= dev
->vhost_ops
->vhost_set_mem_table(dev
, dev
->mem
);
503 VHOST_OPS_DEBUG("vhost_set_mem_table failed");
507 log_size
= vhost_get_log_size(dev
);
508 /* We allocate an extra 4K bytes to log,
509 * to reduce the * number of reallocations. */
510 #define VHOST_LOG_BUFFER (0x1000 / sizeof *dev->log)
511 /* To log more, must increase log size before table update. */
512 if (dev
->log_size
< log_size
) {
513 vhost_dev_log_resize(dev
, log_size
+ VHOST_LOG_BUFFER
);
515 r
= dev
->vhost_ops
->vhost_set_mem_table(dev
, dev
->mem
);
517 VHOST_OPS_DEBUG("vhost_set_mem_table failed");
519 /* To log less, can only decrease log size after table update. */
520 if (dev
->log_size
> log_size
+ VHOST_LOG_BUFFER
) {
521 vhost_dev_log_resize(dev
, log_size
);
525 /* Deref the old list of sections, this must happen _after_ the
526 * vhost_set_mem_table to ensure the client isn't still using the
527 * section we're about to unref.
529 while (n_old_sections
--) {
530 memory_region_unref(old_sections
[n_old_sections
].mr
);
532 g_free(old_sections
);
536 /* Adds the section data to the tmp_section structure.
537 * It relies on the listener calling us in memory address order
538 * and for each region (via the _add and _nop methods) to
541 static void vhost_region_add_section(struct vhost_dev
*dev
,
542 MemoryRegionSection
*section
)
544 bool need_add
= true;
545 uint64_t mrs_size
= int128_get64(section
->size
);
546 uint64_t mrs_gpa
= section
->offset_within_address_space
;
547 uintptr_t mrs_host
= (uintptr_t)memory_region_get_ram_ptr(section
->mr
) +
548 section
->offset_within_region
;
549 RAMBlock
*mrs_rb
= section
->mr
->ram_block
;
551 trace_vhost_region_add_section(section
->mr
->name
, mrs_gpa
, mrs_size
,
554 if (dev
->vhost_ops
->backend_type
== VHOST_BACKEND_TYPE_USER
) {
555 /* Round the section to it's page size */
556 /* First align the start down to a page boundary */
557 size_t mrs_page
= qemu_ram_pagesize(mrs_rb
);
558 uint64_t alignage
= mrs_host
& (mrs_page
- 1);
560 mrs_host
-= alignage
;
561 mrs_size
+= alignage
;
564 /* Now align the size up to a page boundary */
565 alignage
= mrs_size
& (mrs_page
- 1);
567 mrs_size
+= mrs_page
- alignage
;
569 trace_vhost_region_add_section_aligned(section
->mr
->name
, mrs_gpa
,
573 if (dev
->n_tmp_sections
) {
574 /* Since we already have at least one section, lets see if
575 * this extends it; since we're scanning in order, we only
576 * have to look at the last one, and the FlatView that calls
577 * us shouldn't have overlaps.
579 MemoryRegionSection
*prev_sec
= dev
->tmp_sections
+
580 (dev
->n_tmp_sections
- 1);
581 uint64_t prev_gpa_start
= prev_sec
->offset_within_address_space
;
582 uint64_t prev_size
= int128_get64(prev_sec
->size
);
583 uint64_t prev_gpa_end
= range_get_last(prev_gpa_start
, prev_size
);
584 uint64_t prev_host_start
=
585 (uintptr_t)memory_region_get_ram_ptr(prev_sec
->mr
) +
586 prev_sec
->offset_within_region
;
587 uint64_t prev_host_end
= range_get_last(prev_host_start
, prev_size
);
589 if (mrs_gpa
<= (prev_gpa_end
+ 1)) {
590 /* OK, looks like overlapping/intersecting - it's possible that
591 * the rounding to page sizes has made them overlap, but they should
592 * match up in the same RAMBlock if they do.
594 if (mrs_gpa
< prev_gpa_start
) {
595 error_report("%s:Section '%s' rounded to %"PRIx64
596 " prior to previous '%s' %"PRIx64
,
597 __func__
, section
->mr
->name
, mrs_gpa
,
598 prev_sec
->mr
->name
, prev_gpa_start
);
599 /* A way to cleanly fail here would be better */
602 /* Offset from the start of the previous GPA to this GPA */
603 size_t offset
= mrs_gpa
- prev_gpa_start
;
605 if (prev_host_start
+ offset
== mrs_host
&&
606 section
->mr
== prev_sec
->mr
&&
607 (!dev
->vhost_ops
->vhost_backend_can_merge
||
608 dev
->vhost_ops
->vhost_backend_can_merge(dev
,
610 prev_host_start
, prev_size
))) {
611 uint64_t max_end
= MAX(prev_host_end
, mrs_host
+ mrs_size
);
613 prev_sec
->offset_within_address_space
=
614 MIN(prev_gpa_start
, mrs_gpa
);
615 prev_sec
->offset_within_region
=
616 MIN(prev_host_start
, mrs_host
) -
617 (uintptr_t)memory_region_get_ram_ptr(prev_sec
->mr
);
618 prev_sec
->size
= int128_make64(max_end
- MIN(prev_host_start
,
620 trace_vhost_region_add_section_merge(section
->mr
->name
,
621 int128_get64(prev_sec
->size
),
622 prev_sec
->offset_within_address_space
,
623 prev_sec
->offset_within_region
);
625 /* adjoining regions are fine, but overlapping ones with
626 * different blocks/offsets shouldn't happen
628 if (mrs_gpa
!= prev_gpa_end
+ 1) {
629 error_report("%s: Overlapping but not coherent sections "
639 ++dev
->n_tmp_sections
;
640 dev
->tmp_sections
= g_renew(MemoryRegionSection
, dev
->tmp_sections
,
641 dev
->n_tmp_sections
);
642 dev
->tmp_sections
[dev
->n_tmp_sections
- 1] = *section
;
643 /* The flatview isn't stable and we don't use it, making it NULL
644 * means we can memcmp the list.
646 dev
->tmp_sections
[dev
->n_tmp_sections
- 1].fv
= NULL
;
647 memory_region_ref(section
->mr
);
651 /* Used for both add and nop callbacks */
652 static void vhost_region_addnop(MemoryListener
*listener
,
653 MemoryRegionSection
*section
)
655 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
658 if (!vhost_section(dev
, section
)) {
661 vhost_region_add_section(dev
, section
);
664 static void vhost_iommu_unmap_notify(IOMMUNotifier
*n
, IOMMUTLBEntry
*iotlb
)
666 struct vhost_iommu
*iommu
= container_of(n
, struct vhost_iommu
, n
);
667 struct vhost_dev
*hdev
= iommu
->hdev
;
668 hwaddr iova
= iotlb
->iova
+ iommu
->iommu_offset
;
670 if (vhost_backend_invalidate_device_iotlb(hdev
, iova
,
671 iotlb
->addr_mask
+ 1)) {
672 error_report("Fail to invalidate device iotlb");
676 static void vhost_iommu_region_add(MemoryListener
*listener
,
677 MemoryRegionSection
*section
)
679 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
681 struct vhost_iommu
*iommu
;
684 IOMMUMemoryRegion
*iommu_mr
;
687 if (!memory_region_is_iommu(section
->mr
)) {
691 iommu_mr
= IOMMU_MEMORY_REGION(section
->mr
);
693 iommu
= g_malloc0(sizeof(*iommu
));
694 end
= int128_add(int128_make64(section
->offset_within_region
),
696 end
= int128_sub(end
, int128_one());
697 iommu_idx
= memory_region_iommu_attrs_to_index(iommu_mr
,
698 MEMTXATTRS_UNSPECIFIED
);
699 iommu_notifier_init(&iommu
->n
, vhost_iommu_unmap_notify
,
700 IOMMU_NOTIFIER_UNMAP
,
701 section
->offset_within_region
,
704 iommu
->mr
= section
->mr
;
705 iommu
->iommu_offset
= section
->offset_within_address_space
-
706 section
->offset_within_region
;
708 ret
= memory_region_register_iommu_notifier(section
->mr
, &iommu
->n
, &err
);
710 error_report_err(err
);
713 QLIST_INSERT_HEAD(&dev
->iommu_list
, iommu
, iommu_next
);
714 /* TODO: can replay help performance here? */
717 static void vhost_iommu_region_del(MemoryListener
*listener
,
718 MemoryRegionSection
*section
)
720 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
722 struct vhost_iommu
*iommu
;
724 if (!memory_region_is_iommu(section
->mr
)) {
728 QLIST_FOREACH(iommu
, &dev
->iommu_list
, iommu_next
) {
729 if (iommu
->mr
== section
->mr
&&
730 iommu
->n
.start
== section
->offset_within_region
) {
731 memory_region_unregister_iommu_notifier(iommu
->mr
,
733 QLIST_REMOVE(iommu
, iommu_next
);
740 static int vhost_virtqueue_set_addr(struct vhost_dev
*dev
,
741 struct vhost_virtqueue
*vq
,
742 unsigned idx
, bool enable_log
)
744 struct vhost_vring_addr addr
= {
746 .desc_user_addr
= (uint64_t)(unsigned long)vq
->desc
,
747 .avail_user_addr
= (uint64_t)(unsigned long)vq
->avail
,
748 .used_user_addr
= (uint64_t)(unsigned long)vq
->used
,
749 .log_guest_addr
= vq
->used_phys
,
750 .flags
= enable_log
? (1 << VHOST_VRING_F_LOG
) : 0,
752 int r
= dev
->vhost_ops
->vhost_set_vring_addr(dev
, &addr
);
754 VHOST_OPS_DEBUG("vhost_set_vring_addr failed");
760 static int vhost_dev_set_features(struct vhost_dev
*dev
,
763 uint64_t features
= dev
->acked_features
;
766 features
|= 0x1ULL
<< VHOST_F_LOG_ALL
;
768 r
= dev
->vhost_ops
->vhost_set_features(dev
, features
);
770 VHOST_OPS_DEBUG("vhost_set_features failed");
772 return r
< 0 ? -errno
: 0;
775 static int vhost_dev_set_log(struct vhost_dev
*dev
, bool enable_log
)
778 r
= vhost_dev_set_features(dev
, enable_log
);
782 for (i
= 0; i
< dev
->nvqs
; ++i
) {
783 idx
= dev
->vhost_ops
->vhost_get_vq_index(dev
, dev
->vq_index
+ i
);
784 r
= vhost_virtqueue_set_addr(dev
, dev
->vqs
+ i
, idx
,
792 for (; i
>= 0; --i
) {
793 idx
= dev
->vhost_ops
->vhost_get_vq_index(dev
, dev
->vq_index
+ i
);
794 vhost_virtqueue_set_addr(dev
, dev
->vqs
+ i
, idx
,
797 vhost_dev_set_features(dev
, dev
->log_enabled
);
802 static int vhost_migration_log(MemoryListener
*listener
, int enable
)
804 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
807 if (!!enable
== dev
->log_enabled
) {
811 dev
->log_enabled
= enable
;
815 r
= vhost_dev_set_log(dev
, false);
819 vhost_log_put(dev
, false);
821 vhost_dev_log_resize(dev
, vhost_get_log_size(dev
));
822 r
= vhost_dev_set_log(dev
, true);
827 dev
->log_enabled
= enable
;
831 static void vhost_log_global_start(MemoryListener
*listener
)
835 r
= vhost_migration_log(listener
, true);
841 static void vhost_log_global_stop(MemoryListener
*listener
)
845 r
= vhost_migration_log(listener
, false);
851 static void vhost_log_start(MemoryListener
*listener
,
852 MemoryRegionSection
*section
,
855 /* FIXME: implement */
858 static void vhost_log_stop(MemoryListener
*listener
,
859 MemoryRegionSection
*section
,
862 /* FIXME: implement */
865 /* The vhost driver natively knows how to handle the vrings of non
866 * cross-endian legacy devices and modern devices. Only legacy devices
867 * exposed to a bi-endian guest may require the vhost driver to use a
868 * specific endianness.
870 static inline bool vhost_needs_vring_endian(VirtIODevice
*vdev
)
872 if (virtio_vdev_has_feature(vdev
, VIRTIO_F_VERSION_1
)) {
875 #ifdef HOST_WORDS_BIGENDIAN
876 return vdev
->device_endian
== VIRTIO_DEVICE_ENDIAN_LITTLE
;
878 return vdev
->device_endian
== VIRTIO_DEVICE_ENDIAN_BIG
;
882 static int vhost_virtqueue_set_vring_endian_legacy(struct vhost_dev
*dev
,
886 struct vhost_vring_state s
= {
887 .index
= vhost_vq_index
,
891 if (!dev
->vhost_ops
->vhost_set_vring_endian(dev
, &s
)) {
895 VHOST_OPS_DEBUG("vhost_set_vring_endian failed");
896 if (errno
== ENOTTY
) {
897 error_report("vhost does not support cross-endian");
904 static int vhost_memory_region_lookup(struct vhost_dev
*hdev
,
905 uint64_t gpa
, uint64_t *uaddr
,
910 for (i
= 0; i
< hdev
->mem
->nregions
; i
++) {
911 struct vhost_memory_region
*reg
= hdev
->mem
->regions
+ i
;
913 if (gpa
>= reg
->guest_phys_addr
&&
914 reg
->guest_phys_addr
+ reg
->memory_size
> gpa
) {
915 *uaddr
= reg
->userspace_addr
+ gpa
- reg
->guest_phys_addr
;
916 *len
= reg
->guest_phys_addr
+ reg
->memory_size
- gpa
;
924 int vhost_device_iotlb_miss(struct vhost_dev
*dev
, uint64_t iova
, int write
)
930 RCU_READ_LOCK_GUARD();
932 trace_vhost_iotlb_miss(dev
, 1);
934 iotlb
= address_space_get_iotlb_entry(dev
->vdev
->dma_as
,
936 MEMTXATTRS_UNSPECIFIED
);
937 if (iotlb
.target_as
!= NULL
) {
938 ret
= vhost_memory_region_lookup(dev
, iotlb
.translated_addr
,
941 trace_vhost_iotlb_miss(dev
, 3);
942 error_report("Fail to lookup the translated address "
943 "%"PRIx64
, iotlb
.translated_addr
);
947 len
= MIN(iotlb
.addr_mask
+ 1, len
);
948 iova
= iova
& ~iotlb
.addr_mask
;
950 ret
= vhost_backend_update_device_iotlb(dev
, iova
, uaddr
,
953 trace_vhost_iotlb_miss(dev
, 4);
954 error_report("Fail to update device iotlb");
959 trace_vhost_iotlb_miss(dev
, 2);
965 static int vhost_virtqueue_start(struct vhost_dev
*dev
,
966 struct VirtIODevice
*vdev
,
967 struct vhost_virtqueue
*vq
,
970 BusState
*qbus
= BUS(qdev_get_parent_bus(DEVICE(vdev
)));
971 VirtioBusState
*vbus
= VIRTIO_BUS(qbus
);
972 VirtioBusClass
*k
= VIRTIO_BUS_GET_CLASS(vbus
);
975 int vhost_vq_index
= dev
->vhost_ops
->vhost_get_vq_index(dev
, idx
);
976 struct vhost_vring_file file
= {
977 .index
= vhost_vq_index
979 struct vhost_vring_state state
= {
980 .index
= vhost_vq_index
982 struct VirtQueue
*vvq
= virtio_get_queue(vdev
, idx
);
984 a
= virtio_queue_get_desc_addr(vdev
, idx
);
986 /* Queue might not be ready for start */
990 vq
->num
= state
.num
= virtio_queue_get_num(vdev
, idx
);
991 r
= dev
->vhost_ops
->vhost_set_vring_num(dev
, &state
);
993 VHOST_OPS_DEBUG("vhost_set_vring_num failed");
997 state
.num
= virtio_queue_get_last_avail_idx(vdev
, idx
);
998 r
= dev
->vhost_ops
->vhost_set_vring_base(dev
, &state
);
1000 VHOST_OPS_DEBUG("vhost_set_vring_base failed");
1004 if (vhost_needs_vring_endian(vdev
)) {
1005 r
= vhost_virtqueue_set_vring_endian_legacy(dev
,
1006 virtio_is_big_endian(vdev
),
1013 vq
->desc_size
= s
= l
= virtio_queue_get_desc_size(vdev
, idx
);
1015 vq
->desc
= vhost_memory_map(dev
, a
, &l
, 0);
1016 if (!vq
->desc
|| l
!= s
) {
1018 goto fail_alloc_desc
;
1020 vq
->avail_size
= s
= l
= virtio_queue_get_avail_size(vdev
, idx
);
1021 vq
->avail_phys
= a
= virtio_queue_get_avail_addr(vdev
, idx
);
1022 vq
->avail
= vhost_memory_map(dev
, a
, &l
, 0);
1023 if (!vq
->avail
|| l
!= s
) {
1025 goto fail_alloc_avail
;
1027 vq
->used_size
= s
= l
= virtio_queue_get_used_size(vdev
, idx
);
1028 vq
->used_phys
= a
= virtio_queue_get_used_addr(vdev
, idx
);
1029 vq
->used
= vhost_memory_map(dev
, a
, &l
, 1);
1030 if (!vq
->used
|| l
!= s
) {
1032 goto fail_alloc_used
;
1035 r
= vhost_virtqueue_set_addr(dev
, vq
, vhost_vq_index
, dev
->log_enabled
);
1041 file
.fd
= event_notifier_get_fd(virtio_queue_get_host_notifier(vvq
));
1042 r
= dev
->vhost_ops
->vhost_set_vring_kick(dev
, &file
);
1044 VHOST_OPS_DEBUG("vhost_set_vring_kick failed");
1049 /* Clear and discard previous events if any. */
1050 event_notifier_test_and_clear(&vq
->masked_notifier
);
1052 /* Init vring in unmasked state, unless guest_notifier_mask
1055 if (!vdev
->use_guest_notifier_mask
) {
1056 /* TODO: check and handle errors. */
1057 vhost_virtqueue_mask(dev
, vdev
, idx
, false);
1060 if (k
->query_guest_notifiers
&&
1061 k
->query_guest_notifiers(qbus
->parent
) &&
1062 virtio_queue_vector(vdev
, idx
) == VIRTIO_NO_VECTOR
) {
1064 r
= dev
->vhost_ops
->vhost_set_vring_call(dev
, &file
);
1075 vhost_memory_unmap(dev
, vq
->used
, virtio_queue_get_used_size(vdev
, idx
),
1078 vhost_memory_unmap(dev
, vq
->avail
, virtio_queue_get_avail_size(vdev
, idx
),
1081 vhost_memory_unmap(dev
, vq
->desc
, virtio_queue_get_desc_size(vdev
, idx
),
1087 static void vhost_virtqueue_stop(struct vhost_dev
*dev
,
1088 struct VirtIODevice
*vdev
,
1089 struct vhost_virtqueue
*vq
,
1092 int vhost_vq_index
= dev
->vhost_ops
->vhost_get_vq_index(dev
, idx
);
1093 struct vhost_vring_state state
= {
1094 .index
= vhost_vq_index
,
1098 if (virtio_queue_get_desc_addr(vdev
, idx
) == 0) {
1099 /* Don't stop the virtqueue which might have not been started */
1103 r
= dev
->vhost_ops
->vhost_get_vring_base(dev
, &state
);
1105 VHOST_OPS_DEBUG("vhost VQ %u ring restore failed: %d", idx
, r
);
1106 /* Connection to the backend is broken, so let's sync internal
1107 * last avail idx to the device used idx.
1109 virtio_queue_restore_last_avail_idx(vdev
, idx
);
1111 virtio_queue_set_last_avail_idx(vdev
, idx
, state
.num
);
1113 virtio_queue_invalidate_signalled_used(vdev
, idx
);
1114 virtio_queue_update_used_idx(vdev
, idx
);
1116 /* In the cross-endian case, we need to reset the vring endianness to
1117 * native as legacy devices expect so by default.
1119 if (vhost_needs_vring_endian(vdev
)) {
1120 vhost_virtqueue_set_vring_endian_legacy(dev
,
1121 !virtio_is_big_endian(vdev
),
1125 vhost_memory_unmap(dev
, vq
->used
, virtio_queue_get_used_size(vdev
, idx
),
1126 1, virtio_queue_get_used_size(vdev
, idx
));
1127 vhost_memory_unmap(dev
, vq
->avail
, virtio_queue_get_avail_size(vdev
, idx
),
1128 0, virtio_queue_get_avail_size(vdev
, idx
));
1129 vhost_memory_unmap(dev
, vq
->desc
, virtio_queue_get_desc_size(vdev
, idx
),
1130 0, virtio_queue_get_desc_size(vdev
, idx
));
1133 static void vhost_eventfd_add(MemoryListener
*listener
,
1134 MemoryRegionSection
*section
,
1135 bool match_data
, uint64_t data
, EventNotifier
*e
)
1139 static void vhost_eventfd_del(MemoryListener
*listener
,
1140 MemoryRegionSection
*section
,
1141 bool match_data
, uint64_t data
, EventNotifier
*e
)
1145 static int vhost_virtqueue_set_busyloop_timeout(struct vhost_dev
*dev
,
1146 int n
, uint32_t timeout
)
1148 int vhost_vq_index
= dev
->vhost_ops
->vhost_get_vq_index(dev
, n
);
1149 struct vhost_vring_state state
= {
1150 .index
= vhost_vq_index
,
1155 if (!dev
->vhost_ops
->vhost_set_vring_busyloop_timeout
) {
1159 r
= dev
->vhost_ops
->vhost_set_vring_busyloop_timeout(dev
, &state
);
1161 VHOST_OPS_DEBUG("vhost_set_vring_busyloop_timeout failed");
1168 static int vhost_virtqueue_init(struct vhost_dev
*dev
,
1169 struct vhost_virtqueue
*vq
, int n
)
1171 int vhost_vq_index
= dev
->vhost_ops
->vhost_get_vq_index(dev
, n
);
1172 struct vhost_vring_file file
= {
1173 .index
= vhost_vq_index
,
1175 int r
= event_notifier_init(&vq
->masked_notifier
, 0);
1180 file
.fd
= event_notifier_get_fd(&vq
->masked_notifier
);
1181 r
= dev
->vhost_ops
->vhost_set_vring_call(dev
, &file
);
1183 VHOST_OPS_DEBUG("vhost_set_vring_call failed");
1192 event_notifier_cleanup(&vq
->masked_notifier
);
1196 static void vhost_virtqueue_cleanup(struct vhost_virtqueue
*vq
)
1198 event_notifier_cleanup(&vq
->masked_notifier
);
1201 int vhost_dev_init(struct vhost_dev
*hdev
, void *opaque
,
1202 VhostBackendType backend_type
, uint32_t busyloop_timeout
)
1205 int i
, r
, n_initialized_vqs
= 0;
1206 Error
*local_err
= NULL
;
1209 hdev
->migration_blocker
= NULL
;
1211 r
= vhost_set_backend_type(hdev
, backend_type
);
1214 r
= hdev
->vhost_ops
->vhost_backend_init(hdev
, opaque
);
1219 r
= hdev
->vhost_ops
->vhost_set_owner(hdev
);
1221 VHOST_OPS_DEBUG("vhost_set_owner failed");
1225 r
= hdev
->vhost_ops
->vhost_get_features(hdev
, &features
);
1227 VHOST_OPS_DEBUG("vhost_get_features failed");
1231 for (i
= 0; i
< hdev
->nvqs
; ++i
, ++n_initialized_vqs
) {
1232 r
= vhost_virtqueue_init(hdev
, hdev
->vqs
+ i
, hdev
->vq_index
+ i
);
1238 if (busyloop_timeout
) {
1239 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1240 r
= vhost_virtqueue_set_busyloop_timeout(hdev
, hdev
->vq_index
+ i
,
1248 hdev
->features
= features
;
1250 hdev
->memory_listener
= (MemoryListener
) {
1251 .begin
= vhost_begin
,
1252 .commit
= vhost_commit
,
1253 .region_add
= vhost_region_addnop
,
1254 .region_nop
= vhost_region_addnop
,
1255 .log_start
= vhost_log_start
,
1256 .log_stop
= vhost_log_stop
,
1257 .log_sync
= vhost_log_sync
,
1258 .log_global_start
= vhost_log_global_start
,
1259 .log_global_stop
= vhost_log_global_stop
,
1260 .eventfd_add
= vhost_eventfd_add
,
1261 .eventfd_del
= vhost_eventfd_del
,
1265 hdev
->iommu_listener
= (MemoryListener
) {
1266 .region_add
= vhost_iommu_region_add
,
1267 .region_del
= vhost_iommu_region_del
,
1270 if (hdev
->migration_blocker
== NULL
) {
1271 if (!(hdev
->features
& (0x1ULL
<< VHOST_F_LOG_ALL
))) {
1272 error_setg(&hdev
->migration_blocker
,
1273 "Migration disabled: vhost lacks VHOST_F_LOG_ALL feature.");
1274 } else if (vhost_dev_log_is_shared(hdev
) && !qemu_memfd_alloc_check()) {
1275 error_setg(&hdev
->migration_blocker
,
1276 "Migration disabled: failed to allocate shared memory");
1280 if (hdev
->migration_blocker
!= NULL
) {
1281 r
= migrate_add_blocker(hdev
->migration_blocker
, &local_err
);
1283 error_report_err(local_err
);
1284 error_free(hdev
->migration_blocker
);
1289 hdev
->mem
= g_malloc0(offsetof(struct vhost_memory
, regions
));
1290 hdev
->n_mem_sections
= 0;
1291 hdev
->mem_sections
= NULL
;
1294 hdev
->log_enabled
= false;
1295 hdev
->started
= false;
1296 memory_listener_register(&hdev
->memory_listener
, &address_space_memory
);
1297 QLIST_INSERT_HEAD(&vhost_devices
, hdev
, entry
);
1299 if (used_memslots
> hdev
->vhost_ops
->vhost_backend_memslots_limit(hdev
)) {
1300 error_report("vhost backend memory slots limit is less"
1301 " than current number of present memory slots");
1303 if (busyloop_timeout
) {
1314 vhost_virtqueue_set_busyloop_timeout(hdev
, hdev
->vq_index
+ i
, 0);
1317 hdev
->nvqs
= n_initialized_vqs
;
1318 vhost_dev_cleanup(hdev
);
1322 void vhost_dev_cleanup(struct vhost_dev
*hdev
)
1326 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1327 vhost_virtqueue_cleanup(hdev
->vqs
+ i
);
1330 /* those are only safe after successful init */
1331 memory_listener_unregister(&hdev
->memory_listener
);
1332 QLIST_REMOVE(hdev
, entry
);
1334 if (hdev
->migration_blocker
) {
1335 migrate_del_blocker(hdev
->migration_blocker
);
1336 error_free(hdev
->migration_blocker
);
1339 g_free(hdev
->mem_sections
);
1340 if (hdev
->vhost_ops
) {
1341 hdev
->vhost_ops
->vhost_backend_cleanup(hdev
);
1345 memset(hdev
, 0, sizeof(struct vhost_dev
));
1348 /* Stop processing guest IO notifications in qemu.
1349 * Start processing them in vhost in kernel.
1351 int vhost_dev_enable_notifiers(struct vhost_dev
*hdev
, VirtIODevice
*vdev
)
1353 BusState
*qbus
= BUS(qdev_get_parent_bus(DEVICE(vdev
)));
1356 /* We will pass the notifiers to the kernel, make sure that QEMU
1357 * doesn't interfere.
1359 r
= virtio_device_grab_ioeventfd(vdev
);
1361 error_report("binding does not support host notifiers");
1365 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1366 r
= virtio_bus_set_host_notifier(VIRTIO_BUS(qbus
), hdev
->vq_index
+ i
,
1369 error_report("vhost VQ %d notifier binding failed: %d", i
, -r
);
1377 e
= virtio_bus_set_host_notifier(VIRTIO_BUS(qbus
), hdev
->vq_index
+ i
,
1380 error_report("vhost VQ %d notifier cleanup error: %d", i
, -r
);
1383 virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus
), hdev
->vq_index
+ i
);
1385 virtio_device_release_ioeventfd(vdev
);
1390 /* Stop processing guest IO notifications in vhost.
1391 * Start processing them in qemu.
1392 * This might actually run the qemu handlers right away,
1393 * so virtio in qemu must be completely setup when this is called.
1395 void vhost_dev_disable_notifiers(struct vhost_dev
*hdev
, VirtIODevice
*vdev
)
1397 BusState
*qbus
= BUS(qdev_get_parent_bus(DEVICE(vdev
)));
1400 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1401 r
= virtio_bus_set_host_notifier(VIRTIO_BUS(qbus
), hdev
->vq_index
+ i
,
1404 error_report("vhost VQ %d notifier cleanup failed: %d", i
, -r
);
1407 virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus
), hdev
->vq_index
+ i
);
1409 virtio_device_release_ioeventfd(vdev
);
1412 /* Test and clear event pending status.
1413 * Should be called after unmask to avoid losing events.
1415 bool vhost_virtqueue_pending(struct vhost_dev
*hdev
, int n
)
1417 struct vhost_virtqueue
*vq
= hdev
->vqs
+ n
- hdev
->vq_index
;
1418 assert(n
>= hdev
->vq_index
&& n
< hdev
->vq_index
+ hdev
->nvqs
);
1419 return event_notifier_test_and_clear(&vq
->masked_notifier
);
1422 /* Mask/unmask events from this vq. */
1423 void vhost_virtqueue_mask(struct vhost_dev
*hdev
, VirtIODevice
*vdev
, int n
,
1426 struct VirtQueue
*vvq
= virtio_get_queue(vdev
, n
);
1427 int r
, index
= n
- hdev
->vq_index
;
1428 struct vhost_vring_file file
;
1430 /* should only be called after backend is connected */
1431 assert(hdev
->vhost_ops
);
1434 assert(vdev
->use_guest_notifier_mask
);
1435 file
.fd
= event_notifier_get_fd(&hdev
->vqs
[index
].masked_notifier
);
1437 file
.fd
= event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq
));
1440 file
.index
= hdev
->vhost_ops
->vhost_get_vq_index(hdev
, n
);
1441 r
= hdev
->vhost_ops
->vhost_set_vring_call(hdev
, &file
);
1443 VHOST_OPS_DEBUG("vhost_set_vring_call failed");
1447 uint64_t vhost_get_features(struct vhost_dev
*hdev
, const int *feature_bits
,
1450 const int *bit
= feature_bits
;
1451 while (*bit
!= VHOST_INVALID_FEATURE_BIT
) {
1452 uint64_t bit_mask
= (1ULL << *bit
);
1453 if (!(hdev
->features
& bit_mask
)) {
1454 features
&= ~bit_mask
;
1461 void vhost_ack_features(struct vhost_dev
*hdev
, const int *feature_bits
,
1464 const int *bit
= feature_bits
;
1465 while (*bit
!= VHOST_INVALID_FEATURE_BIT
) {
1466 uint64_t bit_mask
= (1ULL << *bit
);
1467 if (features
& bit_mask
) {
1468 hdev
->acked_features
|= bit_mask
;
1474 int vhost_dev_get_config(struct vhost_dev
*hdev
, uint8_t *config
,
1475 uint32_t config_len
)
1477 assert(hdev
->vhost_ops
);
1479 if (hdev
->vhost_ops
->vhost_get_config
) {
1480 return hdev
->vhost_ops
->vhost_get_config(hdev
, config
, config_len
);
1486 int vhost_dev_set_config(struct vhost_dev
*hdev
, const uint8_t *data
,
1487 uint32_t offset
, uint32_t size
, uint32_t flags
)
1489 assert(hdev
->vhost_ops
);
1491 if (hdev
->vhost_ops
->vhost_set_config
) {
1492 return hdev
->vhost_ops
->vhost_set_config(hdev
, data
, offset
,
1499 void vhost_dev_set_config_notifier(struct vhost_dev
*hdev
,
1500 const VhostDevConfigOps
*ops
)
1502 hdev
->config_ops
= ops
;
1505 void vhost_dev_free_inflight(struct vhost_inflight
*inflight
)
1507 if (inflight
->addr
) {
1508 qemu_memfd_free(inflight
->addr
, inflight
->size
, inflight
->fd
);
1509 inflight
->addr
= NULL
;
1514 static int vhost_dev_resize_inflight(struct vhost_inflight
*inflight
,
1519 void *addr
= qemu_memfd_alloc("vhost-inflight", new_size
,
1520 F_SEAL_GROW
| F_SEAL_SHRINK
| F_SEAL_SEAL
,
1524 error_report_err(err
);
1528 vhost_dev_free_inflight(inflight
);
1529 inflight
->offset
= 0;
1530 inflight
->addr
= addr
;
1532 inflight
->size
= new_size
;
1537 void vhost_dev_save_inflight(struct vhost_inflight
*inflight
, QEMUFile
*f
)
1539 if (inflight
->addr
) {
1540 qemu_put_be64(f
, inflight
->size
);
1541 qemu_put_be16(f
, inflight
->queue_size
);
1542 qemu_put_buffer(f
, inflight
->addr
, inflight
->size
);
1544 qemu_put_be64(f
, 0);
1548 int vhost_dev_load_inflight(struct vhost_inflight
*inflight
, QEMUFile
*f
)
1552 size
= qemu_get_be64(f
);
1557 if (inflight
->size
!= size
) {
1558 if (vhost_dev_resize_inflight(inflight
, size
)) {
1562 inflight
->queue_size
= qemu_get_be16(f
);
1564 qemu_get_buffer(f
, inflight
->addr
, size
);
1569 int vhost_dev_set_inflight(struct vhost_dev
*dev
,
1570 struct vhost_inflight
*inflight
)
1574 if (dev
->vhost_ops
->vhost_set_inflight_fd
&& inflight
->addr
) {
1575 r
= dev
->vhost_ops
->vhost_set_inflight_fd(dev
, inflight
);
1577 VHOST_OPS_DEBUG("vhost_set_inflight_fd failed");
1585 int vhost_dev_get_inflight(struct vhost_dev
*dev
, uint16_t queue_size
,
1586 struct vhost_inflight
*inflight
)
1590 if (dev
->vhost_ops
->vhost_get_inflight_fd
) {
1591 r
= dev
->vhost_ops
->vhost_get_inflight_fd(dev
, queue_size
, inflight
);
1593 VHOST_OPS_DEBUG("vhost_get_inflight_fd failed");
1601 /* Host notifiers must be enabled at this point. */
1602 int vhost_dev_start(struct vhost_dev
*hdev
, VirtIODevice
*vdev
)
1606 /* should only be called after backend is connected */
1607 assert(hdev
->vhost_ops
);
1609 hdev
->started
= true;
1612 r
= vhost_dev_set_features(hdev
, hdev
->log_enabled
);
1617 if (vhost_dev_has_iommu(hdev
)) {
1618 memory_listener_register(&hdev
->iommu_listener
, vdev
->dma_as
);
1621 r
= hdev
->vhost_ops
->vhost_set_mem_table(hdev
, hdev
->mem
);
1623 VHOST_OPS_DEBUG("vhost_set_mem_table failed");
1627 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1628 r
= vhost_virtqueue_start(hdev
,
1631 hdev
->vq_index
+ i
);
1637 if (hdev
->log_enabled
) {
1640 hdev
->log_size
= vhost_get_log_size(hdev
);
1641 hdev
->log
= vhost_log_get(hdev
->log_size
,
1642 vhost_dev_log_is_shared(hdev
));
1643 log_base
= (uintptr_t)hdev
->log
->log
;
1644 r
= hdev
->vhost_ops
->vhost_set_log_base(hdev
,
1645 hdev
->log_size
? log_base
: 0,
1648 VHOST_OPS_DEBUG("vhost_set_log_base failed");
1654 if (vhost_dev_has_iommu(hdev
)) {
1655 hdev
->vhost_ops
->vhost_set_iotlb_callback(hdev
, true);
1657 /* Update used ring information for IOTLB to work correctly,
1658 * vhost-kernel code requires for this.*/
1659 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1660 struct vhost_virtqueue
*vq
= hdev
->vqs
+ i
;
1661 vhost_device_iotlb_miss(hdev
, vq
->used_phys
, true);
1666 vhost_log_put(hdev
, false);
1669 vhost_virtqueue_stop(hdev
,
1672 hdev
->vq_index
+ i
);
1678 hdev
->started
= false;
1682 /* Host notifiers must be enabled at this point. */
1683 void vhost_dev_stop(struct vhost_dev
*hdev
, VirtIODevice
*vdev
)
1687 /* should only be called after backend is connected */
1688 assert(hdev
->vhost_ops
);
1690 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1691 vhost_virtqueue_stop(hdev
,
1694 hdev
->vq_index
+ i
);
1697 if (vhost_dev_has_iommu(hdev
)) {
1698 hdev
->vhost_ops
->vhost_set_iotlb_callback(hdev
, false);
1699 memory_listener_unregister(&hdev
->iommu_listener
);
1701 vhost_log_put(hdev
, true);
1702 hdev
->started
= false;
1706 int vhost_net_set_backend(struct vhost_dev
*hdev
,
1707 struct vhost_vring_file
*file
)
1709 if (hdev
->vhost_ops
->vhost_net_set_backend
) {
1710 return hdev
->vhost_ops
->vhost_net_set_backend(hdev
, file
);