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
;
550 size_t mrs_page
= qemu_ram_pagesize(mrs_rb
);
552 trace_vhost_region_add_section(section
->mr
->name
, mrs_gpa
, mrs_size
,
555 /* Round the section to it's page size */
556 /* First align the start down to a page boundary */
557 uint64_t alignage
= mrs_host
& (mrs_page
- 1);
559 mrs_host
-= alignage
;
560 mrs_size
+= alignage
;
563 /* Now align the size up to a page boundary */
564 alignage
= mrs_size
& (mrs_page
- 1);
566 mrs_size
+= mrs_page
- alignage
;
568 trace_vhost_region_add_section_aligned(section
->mr
->name
, mrs_gpa
, mrs_size
,
571 if (dev
->n_tmp_sections
) {
572 /* Since we already have at least one section, lets see if
573 * this extends it; since we're scanning in order, we only
574 * have to look at the last one, and the FlatView that calls
575 * us shouldn't have overlaps.
577 MemoryRegionSection
*prev_sec
= dev
->tmp_sections
+
578 (dev
->n_tmp_sections
- 1);
579 uint64_t prev_gpa_start
= prev_sec
->offset_within_address_space
;
580 uint64_t prev_size
= int128_get64(prev_sec
->size
);
581 uint64_t prev_gpa_end
= range_get_last(prev_gpa_start
, prev_size
);
582 uint64_t prev_host_start
=
583 (uintptr_t)memory_region_get_ram_ptr(prev_sec
->mr
) +
584 prev_sec
->offset_within_region
;
585 uint64_t prev_host_end
= range_get_last(prev_host_start
, prev_size
);
587 if (mrs_gpa
<= (prev_gpa_end
+ 1)) {
588 /* OK, looks like overlapping/intersecting - it's possible that
589 * the rounding to page sizes has made them overlap, but they should
590 * match up in the same RAMBlock if they do.
592 if (mrs_gpa
< prev_gpa_start
) {
593 error_report("%s:Section rounded to %"PRIx64
594 " prior to previous %"PRIx64
,
595 __func__
, mrs_gpa
, prev_gpa_start
);
596 /* A way to cleanly fail here would be better */
599 /* Offset from the start of the previous GPA to this GPA */
600 size_t offset
= mrs_gpa
- prev_gpa_start
;
602 if (prev_host_start
+ offset
== mrs_host
&&
603 section
->mr
== prev_sec
->mr
&&
604 (!dev
->vhost_ops
->vhost_backend_can_merge
||
605 dev
->vhost_ops
->vhost_backend_can_merge(dev
,
607 prev_host_start
, prev_size
))) {
608 uint64_t max_end
= MAX(prev_host_end
, mrs_host
+ mrs_size
);
610 prev_sec
->offset_within_address_space
=
611 MIN(prev_gpa_start
, mrs_gpa
);
612 prev_sec
->offset_within_region
=
613 MIN(prev_host_start
, mrs_host
) -
614 (uintptr_t)memory_region_get_ram_ptr(prev_sec
->mr
);
615 prev_sec
->size
= int128_make64(max_end
- MIN(prev_host_start
,
617 trace_vhost_region_add_section_merge(section
->mr
->name
,
618 int128_get64(prev_sec
->size
),
619 prev_sec
->offset_within_address_space
,
620 prev_sec
->offset_within_region
);
622 /* adjoining regions are fine, but overlapping ones with
623 * different blocks/offsets shouldn't happen
625 if (mrs_gpa
!= prev_gpa_end
+ 1) {
626 error_report("%s: Overlapping but not coherent sections "
636 ++dev
->n_tmp_sections
;
637 dev
->tmp_sections
= g_renew(MemoryRegionSection
, dev
->tmp_sections
,
638 dev
->n_tmp_sections
);
639 dev
->tmp_sections
[dev
->n_tmp_sections
- 1] = *section
;
640 /* The flatview isn't stable and we don't use it, making it NULL
641 * means we can memcmp the list.
643 dev
->tmp_sections
[dev
->n_tmp_sections
- 1].fv
= NULL
;
644 memory_region_ref(section
->mr
);
648 /* Used for both add and nop callbacks */
649 static void vhost_region_addnop(MemoryListener
*listener
,
650 MemoryRegionSection
*section
)
652 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
655 if (!vhost_section(dev
, section
)) {
658 vhost_region_add_section(dev
, section
);
661 static void vhost_iommu_unmap_notify(IOMMUNotifier
*n
, IOMMUTLBEntry
*iotlb
)
663 struct vhost_iommu
*iommu
= container_of(n
, struct vhost_iommu
, n
);
664 struct vhost_dev
*hdev
= iommu
->hdev
;
665 hwaddr iova
= iotlb
->iova
+ iommu
->iommu_offset
;
667 if (vhost_backend_invalidate_device_iotlb(hdev
, iova
,
668 iotlb
->addr_mask
+ 1)) {
669 error_report("Fail to invalidate device iotlb");
673 static void vhost_iommu_region_add(MemoryListener
*listener
,
674 MemoryRegionSection
*section
)
676 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
678 struct vhost_iommu
*iommu
;
681 IOMMUMemoryRegion
*iommu_mr
;
683 if (!memory_region_is_iommu(section
->mr
)) {
687 iommu_mr
= IOMMU_MEMORY_REGION(section
->mr
);
689 iommu
= g_malloc0(sizeof(*iommu
));
690 end
= int128_add(int128_make64(section
->offset_within_region
),
692 end
= int128_sub(end
, int128_one());
693 iommu_idx
= memory_region_iommu_attrs_to_index(iommu_mr
,
694 MEMTXATTRS_UNSPECIFIED
);
695 iommu_notifier_init(&iommu
->n
, vhost_iommu_unmap_notify
,
696 IOMMU_NOTIFIER_UNMAP
,
697 section
->offset_within_region
,
700 iommu
->mr
= section
->mr
;
701 iommu
->iommu_offset
= section
->offset_within_address_space
-
702 section
->offset_within_region
;
704 memory_region_register_iommu_notifier(section
->mr
, &iommu
->n
);
705 QLIST_INSERT_HEAD(&dev
->iommu_list
, iommu
, iommu_next
);
706 /* TODO: can replay help performance here? */
709 static void vhost_iommu_region_del(MemoryListener
*listener
,
710 MemoryRegionSection
*section
)
712 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
714 struct vhost_iommu
*iommu
;
716 if (!memory_region_is_iommu(section
->mr
)) {
720 QLIST_FOREACH(iommu
, &dev
->iommu_list
, iommu_next
) {
721 if (iommu
->mr
== section
->mr
&&
722 iommu
->n
.start
== section
->offset_within_region
) {
723 memory_region_unregister_iommu_notifier(iommu
->mr
,
725 QLIST_REMOVE(iommu
, iommu_next
);
732 static int vhost_virtqueue_set_addr(struct vhost_dev
*dev
,
733 struct vhost_virtqueue
*vq
,
734 unsigned idx
, bool enable_log
)
736 struct vhost_vring_addr addr
= {
738 .desc_user_addr
= (uint64_t)(unsigned long)vq
->desc
,
739 .avail_user_addr
= (uint64_t)(unsigned long)vq
->avail
,
740 .used_user_addr
= (uint64_t)(unsigned long)vq
->used
,
741 .log_guest_addr
= vq
->used_phys
,
742 .flags
= enable_log
? (1 << VHOST_VRING_F_LOG
) : 0,
744 int r
= dev
->vhost_ops
->vhost_set_vring_addr(dev
, &addr
);
746 VHOST_OPS_DEBUG("vhost_set_vring_addr failed");
752 static int vhost_dev_set_features(struct vhost_dev
*dev
,
755 uint64_t features
= dev
->acked_features
;
758 features
|= 0x1ULL
<< VHOST_F_LOG_ALL
;
760 r
= dev
->vhost_ops
->vhost_set_features(dev
, features
);
762 VHOST_OPS_DEBUG("vhost_set_features failed");
764 return r
< 0 ? -errno
: 0;
767 static int vhost_dev_set_log(struct vhost_dev
*dev
, bool enable_log
)
770 r
= vhost_dev_set_features(dev
, enable_log
);
774 for (i
= 0; i
< dev
->nvqs
; ++i
) {
775 idx
= dev
->vhost_ops
->vhost_get_vq_index(dev
, dev
->vq_index
+ i
);
776 r
= vhost_virtqueue_set_addr(dev
, dev
->vqs
+ i
, idx
,
784 for (; i
>= 0; --i
) {
785 idx
= dev
->vhost_ops
->vhost_get_vq_index(dev
, dev
->vq_index
+ i
);
786 vhost_virtqueue_set_addr(dev
, dev
->vqs
+ i
, idx
,
789 vhost_dev_set_features(dev
, dev
->log_enabled
);
794 static int vhost_migration_log(MemoryListener
*listener
, int enable
)
796 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
799 if (!!enable
== dev
->log_enabled
) {
803 dev
->log_enabled
= enable
;
807 r
= vhost_dev_set_log(dev
, false);
811 vhost_log_put(dev
, false);
813 vhost_dev_log_resize(dev
, vhost_get_log_size(dev
));
814 r
= vhost_dev_set_log(dev
, true);
819 dev
->log_enabled
= enable
;
823 static void vhost_log_global_start(MemoryListener
*listener
)
827 r
= vhost_migration_log(listener
, true);
833 static void vhost_log_global_stop(MemoryListener
*listener
)
837 r
= vhost_migration_log(listener
, false);
843 static void vhost_log_start(MemoryListener
*listener
,
844 MemoryRegionSection
*section
,
847 /* FIXME: implement */
850 static void vhost_log_stop(MemoryListener
*listener
,
851 MemoryRegionSection
*section
,
854 /* FIXME: implement */
857 /* The vhost driver natively knows how to handle the vrings of non
858 * cross-endian legacy devices and modern devices. Only legacy devices
859 * exposed to a bi-endian guest may require the vhost driver to use a
860 * specific endianness.
862 static inline bool vhost_needs_vring_endian(VirtIODevice
*vdev
)
864 if (virtio_vdev_has_feature(vdev
, VIRTIO_F_VERSION_1
)) {
867 #ifdef HOST_WORDS_BIGENDIAN
868 return vdev
->device_endian
== VIRTIO_DEVICE_ENDIAN_LITTLE
;
870 return vdev
->device_endian
== VIRTIO_DEVICE_ENDIAN_BIG
;
874 static int vhost_virtqueue_set_vring_endian_legacy(struct vhost_dev
*dev
,
878 struct vhost_vring_state s
= {
879 .index
= vhost_vq_index
,
883 if (!dev
->vhost_ops
->vhost_set_vring_endian(dev
, &s
)) {
887 VHOST_OPS_DEBUG("vhost_set_vring_endian failed");
888 if (errno
== ENOTTY
) {
889 error_report("vhost does not support cross-endian");
896 static int vhost_memory_region_lookup(struct vhost_dev
*hdev
,
897 uint64_t gpa
, uint64_t *uaddr
,
902 for (i
= 0; i
< hdev
->mem
->nregions
; i
++) {
903 struct vhost_memory_region
*reg
= hdev
->mem
->regions
+ i
;
905 if (gpa
>= reg
->guest_phys_addr
&&
906 reg
->guest_phys_addr
+ reg
->memory_size
> gpa
) {
907 *uaddr
= reg
->userspace_addr
+ gpa
- reg
->guest_phys_addr
;
908 *len
= reg
->guest_phys_addr
+ reg
->memory_size
- gpa
;
916 int vhost_device_iotlb_miss(struct vhost_dev
*dev
, uint64_t iova
, int write
)
924 trace_vhost_iotlb_miss(dev
, 1);
926 iotlb
= address_space_get_iotlb_entry(dev
->vdev
->dma_as
,
928 MEMTXATTRS_UNSPECIFIED
);
929 if (iotlb
.target_as
!= NULL
) {
930 ret
= vhost_memory_region_lookup(dev
, iotlb
.translated_addr
,
933 trace_vhost_iotlb_miss(dev
, 3);
934 error_report("Fail to lookup the translated address "
935 "%"PRIx64
, iotlb
.translated_addr
);
939 len
= MIN(iotlb
.addr_mask
+ 1, len
);
940 iova
= iova
& ~iotlb
.addr_mask
;
942 ret
= vhost_backend_update_device_iotlb(dev
, iova
, uaddr
,
945 trace_vhost_iotlb_miss(dev
, 4);
946 error_report("Fail to update device iotlb");
951 trace_vhost_iotlb_miss(dev
, 2);
959 static int vhost_virtqueue_start(struct vhost_dev
*dev
,
960 struct VirtIODevice
*vdev
,
961 struct vhost_virtqueue
*vq
,
964 BusState
*qbus
= BUS(qdev_get_parent_bus(DEVICE(vdev
)));
965 VirtioBusState
*vbus
= VIRTIO_BUS(qbus
);
966 VirtioBusClass
*k
= VIRTIO_BUS_GET_CLASS(vbus
);
969 int vhost_vq_index
= dev
->vhost_ops
->vhost_get_vq_index(dev
, idx
);
970 struct vhost_vring_file file
= {
971 .index
= vhost_vq_index
973 struct vhost_vring_state state
= {
974 .index
= vhost_vq_index
976 struct VirtQueue
*vvq
= virtio_get_queue(vdev
, idx
);
978 a
= virtio_queue_get_desc_addr(vdev
, idx
);
980 /* Queue might not be ready for start */
984 vq
->num
= state
.num
= virtio_queue_get_num(vdev
, idx
);
985 r
= dev
->vhost_ops
->vhost_set_vring_num(dev
, &state
);
987 VHOST_OPS_DEBUG("vhost_set_vring_num failed");
991 state
.num
= virtio_queue_get_last_avail_idx(vdev
, idx
);
992 r
= dev
->vhost_ops
->vhost_set_vring_base(dev
, &state
);
994 VHOST_OPS_DEBUG("vhost_set_vring_base failed");
998 if (vhost_needs_vring_endian(vdev
)) {
999 r
= vhost_virtqueue_set_vring_endian_legacy(dev
,
1000 virtio_is_big_endian(vdev
),
1007 vq
->desc_size
= s
= l
= virtio_queue_get_desc_size(vdev
, idx
);
1009 vq
->desc
= vhost_memory_map(dev
, a
, &l
, 0);
1010 if (!vq
->desc
|| l
!= s
) {
1012 goto fail_alloc_desc
;
1014 vq
->avail_size
= s
= l
= virtio_queue_get_avail_size(vdev
, idx
);
1015 vq
->avail_phys
= a
= virtio_queue_get_avail_addr(vdev
, idx
);
1016 vq
->avail
= vhost_memory_map(dev
, a
, &l
, 0);
1017 if (!vq
->avail
|| l
!= s
) {
1019 goto fail_alloc_avail
;
1021 vq
->used_size
= s
= l
= virtio_queue_get_used_size(vdev
, idx
);
1022 vq
->used_phys
= a
= virtio_queue_get_used_addr(vdev
, idx
);
1023 vq
->used
= vhost_memory_map(dev
, a
, &l
, 1);
1024 if (!vq
->used
|| l
!= s
) {
1026 goto fail_alloc_used
;
1029 r
= vhost_virtqueue_set_addr(dev
, vq
, vhost_vq_index
, dev
->log_enabled
);
1035 file
.fd
= event_notifier_get_fd(virtio_queue_get_host_notifier(vvq
));
1036 r
= dev
->vhost_ops
->vhost_set_vring_kick(dev
, &file
);
1038 VHOST_OPS_DEBUG("vhost_set_vring_kick failed");
1043 /* Clear and discard previous events if any. */
1044 event_notifier_test_and_clear(&vq
->masked_notifier
);
1046 /* Init vring in unmasked state, unless guest_notifier_mask
1049 if (!vdev
->use_guest_notifier_mask
) {
1050 /* TODO: check and handle errors. */
1051 vhost_virtqueue_mask(dev
, vdev
, idx
, false);
1054 if (k
->query_guest_notifiers
&&
1055 k
->query_guest_notifiers(qbus
->parent
) &&
1056 virtio_queue_vector(vdev
, idx
) == VIRTIO_NO_VECTOR
) {
1058 r
= dev
->vhost_ops
->vhost_set_vring_call(dev
, &file
);
1069 vhost_memory_unmap(dev
, vq
->used
, virtio_queue_get_used_size(vdev
, idx
),
1072 vhost_memory_unmap(dev
, vq
->avail
, virtio_queue_get_avail_size(vdev
, idx
),
1075 vhost_memory_unmap(dev
, vq
->desc
, virtio_queue_get_desc_size(vdev
, idx
),
1081 static void vhost_virtqueue_stop(struct vhost_dev
*dev
,
1082 struct VirtIODevice
*vdev
,
1083 struct vhost_virtqueue
*vq
,
1086 int vhost_vq_index
= dev
->vhost_ops
->vhost_get_vq_index(dev
, idx
);
1087 struct vhost_vring_state state
= {
1088 .index
= vhost_vq_index
,
1092 if (virtio_queue_get_desc_addr(vdev
, idx
) == 0) {
1093 /* Don't stop the virtqueue which might have not been started */
1097 r
= dev
->vhost_ops
->vhost_get_vring_base(dev
, &state
);
1099 VHOST_OPS_DEBUG("vhost VQ %u ring restore failed: %d", idx
, r
);
1100 /* Connection to the backend is broken, so let's sync internal
1101 * last avail idx to the device used idx.
1103 virtio_queue_restore_last_avail_idx(vdev
, idx
);
1105 virtio_queue_set_last_avail_idx(vdev
, idx
, state
.num
);
1107 virtio_queue_invalidate_signalled_used(vdev
, idx
);
1108 virtio_queue_update_used_idx(vdev
, idx
);
1110 /* In the cross-endian case, we need to reset the vring endianness to
1111 * native as legacy devices expect so by default.
1113 if (vhost_needs_vring_endian(vdev
)) {
1114 vhost_virtqueue_set_vring_endian_legacy(dev
,
1115 !virtio_is_big_endian(vdev
),
1119 vhost_memory_unmap(dev
, vq
->used
, virtio_queue_get_used_size(vdev
, idx
),
1120 1, virtio_queue_get_used_size(vdev
, idx
));
1121 vhost_memory_unmap(dev
, vq
->avail
, virtio_queue_get_avail_size(vdev
, idx
),
1122 0, virtio_queue_get_avail_size(vdev
, idx
));
1123 vhost_memory_unmap(dev
, vq
->desc
, virtio_queue_get_desc_size(vdev
, idx
),
1124 0, virtio_queue_get_desc_size(vdev
, idx
));
1127 static void vhost_eventfd_add(MemoryListener
*listener
,
1128 MemoryRegionSection
*section
,
1129 bool match_data
, uint64_t data
, EventNotifier
*e
)
1133 static void vhost_eventfd_del(MemoryListener
*listener
,
1134 MemoryRegionSection
*section
,
1135 bool match_data
, uint64_t data
, EventNotifier
*e
)
1139 static int vhost_virtqueue_set_busyloop_timeout(struct vhost_dev
*dev
,
1140 int n
, uint32_t timeout
)
1142 int vhost_vq_index
= dev
->vhost_ops
->vhost_get_vq_index(dev
, n
);
1143 struct vhost_vring_state state
= {
1144 .index
= vhost_vq_index
,
1149 if (!dev
->vhost_ops
->vhost_set_vring_busyloop_timeout
) {
1153 r
= dev
->vhost_ops
->vhost_set_vring_busyloop_timeout(dev
, &state
);
1155 VHOST_OPS_DEBUG("vhost_set_vring_busyloop_timeout failed");
1162 static int vhost_virtqueue_init(struct vhost_dev
*dev
,
1163 struct vhost_virtqueue
*vq
, int n
)
1165 int vhost_vq_index
= dev
->vhost_ops
->vhost_get_vq_index(dev
, n
);
1166 struct vhost_vring_file file
= {
1167 .index
= vhost_vq_index
,
1169 int r
= event_notifier_init(&vq
->masked_notifier
, 0);
1174 file
.fd
= event_notifier_get_fd(&vq
->masked_notifier
);
1175 r
= dev
->vhost_ops
->vhost_set_vring_call(dev
, &file
);
1177 VHOST_OPS_DEBUG("vhost_set_vring_call failed");
1186 event_notifier_cleanup(&vq
->masked_notifier
);
1190 static void vhost_virtqueue_cleanup(struct vhost_virtqueue
*vq
)
1192 event_notifier_cleanup(&vq
->masked_notifier
);
1195 int vhost_dev_init(struct vhost_dev
*hdev
, void *opaque
,
1196 VhostBackendType backend_type
, uint32_t busyloop_timeout
)
1199 int i
, r
, n_initialized_vqs
= 0;
1200 Error
*local_err
= NULL
;
1203 hdev
->migration_blocker
= NULL
;
1205 r
= vhost_set_backend_type(hdev
, backend_type
);
1208 r
= hdev
->vhost_ops
->vhost_backend_init(hdev
, opaque
);
1213 r
= hdev
->vhost_ops
->vhost_set_owner(hdev
);
1215 VHOST_OPS_DEBUG("vhost_set_owner failed");
1219 r
= hdev
->vhost_ops
->vhost_get_features(hdev
, &features
);
1221 VHOST_OPS_DEBUG("vhost_get_features failed");
1225 for (i
= 0; i
< hdev
->nvqs
; ++i
, ++n_initialized_vqs
) {
1226 r
= vhost_virtqueue_init(hdev
, hdev
->vqs
+ i
, hdev
->vq_index
+ i
);
1232 if (busyloop_timeout
) {
1233 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1234 r
= vhost_virtqueue_set_busyloop_timeout(hdev
, hdev
->vq_index
+ i
,
1242 hdev
->features
= features
;
1244 hdev
->memory_listener
= (MemoryListener
) {
1245 .begin
= vhost_begin
,
1246 .commit
= vhost_commit
,
1247 .region_add
= vhost_region_addnop
,
1248 .region_nop
= vhost_region_addnop
,
1249 .log_start
= vhost_log_start
,
1250 .log_stop
= vhost_log_stop
,
1251 .log_sync
= vhost_log_sync
,
1252 .log_global_start
= vhost_log_global_start
,
1253 .log_global_stop
= vhost_log_global_stop
,
1254 .eventfd_add
= vhost_eventfd_add
,
1255 .eventfd_del
= vhost_eventfd_del
,
1259 hdev
->iommu_listener
= (MemoryListener
) {
1260 .region_add
= vhost_iommu_region_add
,
1261 .region_del
= vhost_iommu_region_del
,
1264 if (hdev
->migration_blocker
== NULL
) {
1265 if (!(hdev
->features
& (0x1ULL
<< VHOST_F_LOG_ALL
))) {
1266 error_setg(&hdev
->migration_blocker
,
1267 "Migration disabled: vhost lacks VHOST_F_LOG_ALL feature.");
1268 } else if (vhost_dev_log_is_shared(hdev
) && !qemu_memfd_alloc_check()) {
1269 error_setg(&hdev
->migration_blocker
,
1270 "Migration disabled: failed to allocate shared memory");
1274 if (hdev
->migration_blocker
!= NULL
) {
1275 r
= migrate_add_blocker(hdev
->migration_blocker
, &local_err
);
1277 error_report_err(local_err
);
1278 error_free(hdev
->migration_blocker
);
1283 hdev
->mem
= g_malloc0(offsetof(struct vhost_memory
, regions
));
1284 hdev
->n_mem_sections
= 0;
1285 hdev
->mem_sections
= NULL
;
1288 hdev
->log_enabled
= false;
1289 hdev
->started
= false;
1290 memory_listener_register(&hdev
->memory_listener
, &address_space_memory
);
1291 QLIST_INSERT_HEAD(&vhost_devices
, hdev
, entry
);
1293 if (used_memslots
> hdev
->vhost_ops
->vhost_backend_memslots_limit(hdev
)) {
1294 error_report("vhost backend memory slots limit is less"
1295 " than current number of present memory slots");
1297 if (busyloop_timeout
) {
1308 vhost_virtqueue_set_busyloop_timeout(hdev
, hdev
->vq_index
+ i
, 0);
1311 hdev
->nvqs
= n_initialized_vqs
;
1312 vhost_dev_cleanup(hdev
);
1316 void vhost_dev_cleanup(struct vhost_dev
*hdev
)
1320 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1321 vhost_virtqueue_cleanup(hdev
->vqs
+ i
);
1324 /* those are only safe after successful init */
1325 memory_listener_unregister(&hdev
->memory_listener
);
1326 QLIST_REMOVE(hdev
, entry
);
1328 if (hdev
->migration_blocker
) {
1329 migrate_del_blocker(hdev
->migration_blocker
);
1330 error_free(hdev
->migration_blocker
);
1333 g_free(hdev
->mem_sections
);
1334 if (hdev
->vhost_ops
) {
1335 hdev
->vhost_ops
->vhost_backend_cleanup(hdev
);
1339 memset(hdev
, 0, sizeof(struct vhost_dev
));
1342 /* Stop processing guest IO notifications in qemu.
1343 * Start processing them in vhost in kernel.
1345 int vhost_dev_enable_notifiers(struct vhost_dev
*hdev
, VirtIODevice
*vdev
)
1347 BusState
*qbus
= BUS(qdev_get_parent_bus(DEVICE(vdev
)));
1350 /* We will pass the notifiers to the kernel, make sure that QEMU
1351 * doesn't interfere.
1353 r
= virtio_device_grab_ioeventfd(vdev
);
1355 error_report("binding does not support host notifiers");
1359 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1360 r
= virtio_bus_set_host_notifier(VIRTIO_BUS(qbus
), hdev
->vq_index
+ i
,
1363 error_report("vhost VQ %d notifier binding failed: %d", i
, -r
);
1371 e
= virtio_bus_set_host_notifier(VIRTIO_BUS(qbus
), hdev
->vq_index
+ i
,
1374 error_report("vhost VQ %d notifier cleanup error: %d", i
, -r
);
1377 virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus
), hdev
->vq_index
+ i
);
1379 virtio_device_release_ioeventfd(vdev
);
1384 /* Stop processing guest IO notifications in vhost.
1385 * Start processing them in qemu.
1386 * This might actually run the qemu handlers right away,
1387 * so virtio in qemu must be completely setup when this is called.
1389 void vhost_dev_disable_notifiers(struct vhost_dev
*hdev
, VirtIODevice
*vdev
)
1391 BusState
*qbus
= BUS(qdev_get_parent_bus(DEVICE(vdev
)));
1394 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1395 r
= virtio_bus_set_host_notifier(VIRTIO_BUS(qbus
), hdev
->vq_index
+ i
,
1398 error_report("vhost VQ %d notifier cleanup failed: %d", i
, -r
);
1401 virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus
), hdev
->vq_index
+ i
);
1403 virtio_device_release_ioeventfd(vdev
);
1406 /* Test and clear event pending status.
1407 * Should be called after unmask to avoid losing events.
1409 bool vhost_virtqueue_pending(struct vhost_dev
*hdev
, int n
)
1411 struct vhost_virtqueue
*vq
= hdev
->vqs
+ n
- hdev
->vq_index
;
1412 assert(n
>= hdev
->vq_index
&& n
< hdev
->vq_index
+ hdev
->nvqs
);
1413 return event_notifier_test_and_clear(&vq
->masked_notifier
);
1416 /* Mask/unmask events from this vq. */
1417 void vhost_virtqueue_mask(struct vhost_dev
*hdev
, VirtIODevice
*vdev
, int n
,
1420 struct VirtQueue
*vvq
= virtio_get_queue(vdev
, n
);
1421 int r
, index
= n
- hdev
->vq_index
;
1422 struct vhost_vring_file file
;
1424 /* should only be called after backend is connected */
1425 assert(hdev
->vhost_ops
);
1428 assert(vdev
->use_guest_notifier_mask
);
1429 file
.fd
= event_notifier_get_fd(&hdev
->vqs
[index
].masked_notifier
);
1431 file
.fd
= event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq
));
1434 file
.index
= hdev
->vhost_ops
->vhost_get_vq_index(hdev
, n
);
1435 r
= hdev
->vhost_ops
->vhost_set_vring_call(hdev
, &file
);
1437 VHOST_OPS_DEBUG("vhost_set_vring_call failed");
1441 uint64_t vhost_get_features(struct vhost_dev
*hdev
, const int *feature_bits
,
1444 const int *bit
= feature_bits
;
1445 while (*bit
!= VHOST_INVALID_FEATURE_BIT
) {
1446 uint64_t bit_mask
= (1ULL << *bit
);
1447 if (!(hdev
->features
& bit_mask
)) {
1448 features
&= ~bit_mask
;
1455 void vhost_ack_features(struct vhost_dev
*hdev
, const int *feature_bits
,
1458 const int *bit
= feature_bits
;
1459 while (*bit
!= VHOST_INVALID_FEATURE_BIT
) {
1460 uint64_t bit_mask
= (1ULL << *bit
);
1461 if (features
& bit_mask
) {
1462 hdev
->acked_features
|= bit_mask
;
1468 int vhost_dev_get_config(struct vhost_dev
*hdev
, uint8_t *config
,
1469 uint32_t config_len
)
1471 assert(hdev
->vhost_ops
);
1473 if (hdev
->vhost_ops
->vhost_get_config
) {
1474 return hdev
->vhost_ops
->vhost_get_config(hdev
, config
, config_len
);
1480 int vhost_dev_set_config(struct vhost_dev
*hdev
, const uint8_t *data
,
1481 uint32_t offset
, uint32_t size
, uint32_t flags
)
1483 assert(hdev
->vhost_ops
);
1485 if (hdev
->vhost_ops
->vhost_set_config
) {
1486 return hdev
->vhost_ops
->vhost_set_config(hdev
, data
, offset
,
1493 void vhost_dev_set_config_notifier(struct vhost_dev
*hdev
,
1494 const VhostDevConfigOps
*ops
)
1496 hdev
->config_ops
= ops
;
1499 void vhost_dev_free_inflight(struct vhost_inflight
*inflight
)
1501 if (inflight
->addr
) {
1502 qemu_memfd_free(inflight
->addr
, inflight
->size
, inflight
->fd
);
1503 inflight
->addr
= NULL
;
1508 static int vhost_dev_resize_inflight(struct vhost_inflight
*inflight
,
1513 void *addr
= qemu_memfd_alloc("vhost-inflight", new_size
,
1514 F_SEAL_GROW
| F_SEAL_SHRINK
| F_SEAL_SEAL
,
1518 error_report_err(err
);
1522 vhost_dev_free_inflight(inflight
);
1523 inflight
->offset
= 0;
1524 inflight
->addr
= addr
;
1526 inflight
->size
= new_size
;
1531 void vhost_dev_save_inflight(struct vhost_inflight
*inflight
, QEMUFile
*f
)
1533 if (inflight
->addr
) {
1534 qemu_put_be64(f
, inflight
->size
);
1535 qemu_put_be16(f
, inflight
->queue_size
);
1536 qemu_put_buffer(f
, inflight
->addr
, inflight
->size
);
1538 qemu_put_be64(f
, 0);
1542 int vhost_dev_load_inflight(struct vhost_inflight
*inflight
, QEMUFile
*f
)
1546 size
= qemu_get_be64(f
);
1551 if (inflight
->size
!= size
) {
1552 if (vhost_dev_resize_inflight(inflight
, size
)) {
1556 inflight
->queue_size
= qemu_get_be16(f
);
1558 qemu_get_buffer(f
, inflight
->addr
, size
);
1563 int vhost_dev_set_inflight(struct vhost_dev
*dev
,
1564 struct vhost_inflight
*inflight
)
1568 if (dev
->vhost_ops
->vhost_set_inflight_fd
&& inflight
->addr
) {
1569 r
= dev
->vhost_ops
->vhost_set_inflight_fd(dev
, inflight
);
1571 VHOST_OPS_DEBUG("vhost_set_inflight_fd failed");
1579 int vhost_dev_get_inflight(struct vhost_dev
*dev
, uint16_t queue_size
,
1580 struct vhost_inflight
*inflight
)
1584 if (dev
->vhost_ops
->vhost_get_inflight_fd
) {
1585 r
= dev
->vhost_ops
->vhost_get_inflight_fd(dev
, queue_size
, inflight
);
1587 VHOST_OPS_DEBUG("vhost_get_inflight_fd failed");
1595 /* Host notifiers must be enabled at this point. */
1596 int vhost_dev_start(struct vhost_dev
*hdev
, VirtIODevice
*vdev
)
1600 /* should only be called after backend is connected */
1601 assert(hdev
->vhost_ops
);
1603 hdev
->started
= true;
1606 r
= vhost_dev_set_features(hdev
, hdev
->log_enabled
);
1611 if (vhost_dev_has_iommu(hdev
)) {
1612 memory_listener_register(&hdev
->iommu_listener
, vdev
->dma_as
);
1615 r
= hdev
->vhost_ops
->vhost_set_mem_table(hdev
, hdev
->mem
);
1617 VHOST_OPS_DEBUG("vhost_set_mem_table failed");
1621 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1622 r
= vhost_virtqueue_start(hdev
,
1625 hdev
->vq_index
+ i
);
1631 if (hdev
->log_enabled
) {
1634 hdev
->log_size
= vhost_get_log_size(hdev
);
1635 hdev
->log
= vhost_log_get(hdev
->log_size
,
1636 vhost_dev_log_is_shared(hdev
));
1637 log_base
= (uintptr_t)hdev
->log
->log
;
1638 r
= hdev
->vhost_ops
->vhost_set_log_base(hdev
,
1639 hdev
->log_size
? log_base
: 0,
1642 VHOST_OPS_DEBUG("vhost_set_log_base failed");
1648 if (vhost_dev_has_iommu(hdev
)) {
1649 hdev
->vhost_ops
->vhost_set_iotlb_callback(hdev
, true);
1651 /* Update used ring information for IOTLB to work correctly,
1652 * vhost-kernel code requires for this.*/
1653 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1654 struct vhost_virtqueue
*vq
= hdev
->vqs
+ i
;
1655 vhost_device_iotlb_miss(hdev
, vq
->used_phys
, true);
1660 vhost_log_put(hdev
, false);
1663 vhost_virtqueue_stop(hdev
,
1666 hdev
->vq_index
+ i
);
1672 hdev
->started
= false;
1676 /* Host notifiers must be enabled at this point. */
1677 void vhost_dev_stop(struct vhost_dev
*hdev
, VirtIODevice
*vdev
)
1681 /* should only be called after backend is connected */
1682 assert(hdev
->vhost_ops
);
1684 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1685 vhost_virtqueue_stop(hdev
,
1688 hdev
->vq_index
+ i
);
1691 if (vhost_dev_has_iommu(hdev
)) {
1692 hdev
->vhost_ops
->vhost_set_iotlb_callback(hdev
, false);
1693 memory_listener_unregister(&hdev
->iommu_listener
);
1695 vhost_log_put(hdev
, true);
1696 hdev
->started
= false;
1700 int vhost_net_set_backend(struct vhost_dev
*hdev
,
1701 struct vhost_vring_file
*file
)
1703 if (hdev
->vhost_ops
->vhost_net_set_backend
) {
1704 return hdev
->vhost_ops
->vhost_net_set_backend(hdev
, file
);