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"
24 #include "standard-headers/linux/vhost_types.h"
25 #include "hw/virtio/virtio-bus.h"
26 #include "migration/blocker.h"
27 #include "migration/qemu-file-types.h"
28 #include "sysemu/dma.h"
31 /* enabled until disconnected backend stabilizes */
32 #define _VHOST_DEBUG 1
35 #define VHOST_OPS_DEBUG(retval, fmt, ...) \
37 error_report(fmt ": %s (%d)", ## __VA_ARGS__, \
38 strerror(-retval), -retval); \
41 #define VHOST_OPS_DEBUG(retval, fmt, ...) \
45 static struct vhost_log
*vhost_log
;
46 static struct vhost_log
*vhost_log_shm
;
48 static unsigned int used_memslots
;
49 static QLIST_HEAD(, vhost_dev
) vhost_devices
=
50 QLIST_HEAD_INITIALIZER(vhost_devices
);
52 bool vhost_has_free_slot(void)
54 unsigned int slots_limit
= ~0U;
55 struct vhost_dev
*hdev
;
57 QLIST_FOREACH(hdev
, &vhost_devices
, entry
) {
58 unsigned int r
= hdev
->vhost_ops
->vhost_backend_memslots_limit(hdev
);
59 slots_limit
= MIN(slots_limit
, r
);
61 return slots_limit
> used_memslots
;
64 static void vhost_dev_sync_region(struct vhost_dev
*dev
,
65 MemoryRegionSection
*section
,
66 uint64_t mfirst
, uint64_t mlast
,
67 uint64_t rfirst
, uint64_t rlast
)
69 vhost_log_chunk_t
*log
= dev
->log
->log
;
71 uint64_t start
= MAX(mfirst
, rfirst
);
72 uint64_t end
= MIN(mlast
, rlast
);
73 vhost_log_chunk_t
*from
= log
+ start
/ VHOST_LOG_CHUNK
;
74 vhost_log_chunk_t
*to
= log
+ end
/ VHOST_LOG_CHUNK
+ 1;
75 uint64_t addr
= QEMU_ALIGN_DOWN(start
, VHOST_LOG_CHUNK
);
80 assert(end
/ VHOST_LOG_CHUNK
< dev
->log_size
);
81 assert(start
/ VHOST_LOG_CHUNK
< dev
->log_size
);
83 for (;from
< to
; ++from
) {
84 vhost_log_chunk_t log
;
85 /* We first check with non-atomic: much cheaper,
86 * and we expect non-dirty to be the common case. */
88 addr
+= VHOST_LOG_CHUNK
;
91 /* Data must be read atomically. We don't really need barrier semantics
92 * but it's easier to use atomic_* than roll our own. */
93 log
= qatomic_xchg(from
, 0);
97 hwaddr section_offset
;
99 page_addr
= addr
+ bit
* VHOST_LOG_PAGE
;
100 section_offset
= page_addr
- section
->offset_within_address_space
;
101 mr_offset
= section_offset
+ section
->offset_within_region
;
102 memory_region_set_dirty(section
->mr
, mr_offset
, VHOST_LOG_PAGE
);
103 log
&= ~(0x1ull
<< bit
);
105 addr
+= VHOST_LOG_CHUNK
;
109 bool vhost_dev_has_iommu(struct vhost_dev
*dev
)
111 VirtIODevice
*vdev
= dev
->vdev
;
114 * For vhost, VIRTIO_F_IOMMU_PLATFORM means the backend support
115 * incremental memory mapping API via IOTLB API. For platform that
116 * does not have IOMMU, there's no need to enable this feature
117 * which may cause unnecessary IOTLB miss/update transactions.
120 return virtio_bus_device_iommu_enabled(vdev
) &&
121 virtio_host_has_feature(vdev
, VIRTIO_F_IOMMU_PLATFORM
);
127 static int vhost_sync_dirty_bitmap(struct vhost_dev
*dev
,
128 MemoryRegionSection
*section
,
136 if (!dev
->log_enabled
|| !dev
->started
) {
139 start_addr
= section
->offset_within_address_space
;
140 end_addr
= range_get_last(start_addr
, int128_get64(section
->size
));
141 start_addr
= MAX(first
, start_addr
);
142 end_addr
= MIN(last
, end_addr
);
144 for (i
= 0; i
< dev
->mem
->nregions
; ++i
) {
145 struct vhost_memory_region
*reg
= dev
->mem
->regions
+ i
;
146 vhost_dev_sync_region(dev
, section
, start_addr
, end_addr
,
147 reg
->guest_phys_addr
,
148 range_get_last(reg
->guest_phys_addr
,
151 for (i
= 0; i
< dev
->nvqs
; ++i
) {
152 struct vhost_virtqueue
*vq
= dev
->vqs
+ i
;
154 if (!vq
->used_phys
&& !vq
->used_size
) {
158 if (vhost_dev_has_iommu(dev
)) {
160 hwaddr used_phys
= vq
->used_phys
, used_size
= vq
->used_size
;
161 hwaddr phys
, s
, offset
;
165 iotlb
= address_space_get_iotlb_entry(dev
->vdev
->dma_as
,
168 MEMTXATTRS_UNSPECIFIED
);
171 if (!iotlb
.target_as
) {
172 qemu_log_mask(LOG_GUEST_ERROR
, "translation "
173 "failure for used_iova %"PRIx64
"\n",
178 offset
= used_phys
& iotlb
.addr_mask
;
179 phys
= iotlb
.translated_addr
+ offset
;
182 * Distance from start of used ring until last byte of
185 s
= iotlb
.addr_mask
- offset
;
187 * Size of used ring, or of the part of it until end
188 * of IOMMU page. To avoid zero result, do the adding
191 s
= MIN(s
, used_size
- 1) + 1;
193 vhost_dev_sync_region(dev
, section
, start_addr
, end_addr
, phys
,
194 range_get_last(phys
, s
));
199 vhost_dev_sync_region(dev
, section
, start_addr
,
200 end_addr
, vq
->used_phys
,
201 range_get_last(vq
->used_phys
, vq
->used_size
));
207 static void vhost_log_sync(MemoryListener
*listener
,
208 MemoryRegionSection
*section
)
210 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
212 vhost_sync_dirty_bitmap(dev
, section
, 0x0, ~0x0ULL
);
215 static void vhost_log_sync_range(struct vhost_dev
*dev
,
216 hwaddr first
, hwaddr last
)
219 /* FIXME: this is N^2 in number of sections */
220 for (i
= 0; i
< dev
->n_mem_sections
; ++i
) {
221 MemoryRegionSection
*section
= &dev
->mem_sections
[i
];
222 vhost_sync_dirty_bitmap(dev
, section
, first
, last
);
226 static uint64_t vhost_get_log_size(struct vhost_dev
*dev
)
228 uint64_t log_size
= 0;
230 for (i
= 0; i
< dev
->mem
->nregions
; ++i
) {
231 struct vhost_memory_region
*reg
= dev
->mem
->regions
+ i
;
232 uint64_t last
= range_get_last(reg
->guest_phys_addr
,
234 log_size
= MAX(log_size
, last
/ VHOST_LOG_CHUNK
+ 1);
239 static int vhost_set_backend_type(struct vhost_dev
*dev
,
240 VhostBackendType backend_type
)
244 switch (backend_type
) {
245 #ifdef CONFIG_VHOST_KERNEL
246 case VHOST_BACKEND_TYPE_KERNEL
:
247 dev
->vhost_ops
= &kernel_ops
;
250 #ifdef CONFIG_VHOST_USER
251 case VHOST_BACKEND_TYPE_USER
:
252 dev
->vhost_ops
= &user_ops
;
255 #ifdef CONFIG_VHOST_VDPA
256 case VHOST_BACKEND_TYPE_VDPA
:
257 dev
->vhost_ops
= &vdpa_ops
;
261 error_report("Unknown vhost backend type");
268 static struct vhost_log
*vhost_log_alloc(uint64_t size
, bool share
)
271 struct vhost_log
*log
;
272 uint64_t logsize
= size
* sizeof(*(log
->log
));
275 log
= g_new0(struct vhost_log
, 1);
277 log
->log
= qemu_memfd_alloc("vhost-log", logsize
,
278 F_SEAL_GROW
| F_SEAL_SHRINK
| F_SEAL_SEAL
,
281 error_report_err(err
);
285 memset(log
->log
, 0, logsize
);
287 log
->log
= g_malloc0(logsize
);
297 static struct vhost_log
*vhost_log_get(uint64_t size
, bool share
)
299 struct vhost_log
*log
= share
? vhost_log_shm
: vhost_log
;
301 if (!log
|| log
->size
!= size
) {
302 log
= vhost_log_alloc(size
, share
);
315 static void vhost_log_put(struct vhost_dev
*dev
, bool sync
)
317 struct vhost_log
*log
= dev
->log
;
324 if (log
->refcnt
== 0) {
325 /* Sync only the range covered by the old log */
326 if (dev
->log_size
&& sync
) {
327 vhost_log_sync_range(dev
, 0, dev
->log_size
* VHOST_LOG_CHUNK
- 1);
330 if (vhost_log
== log
) {
333 } else if (vhost_log_shm
== log
) {
334 qemu_memfd_free(log
->log
, log
->size
* sizeof(*(log
->log
)),
336 vhost_log_shm
= NULL
;
346 static bool vhost_dev_log_is_shared(struct vhost_dev
*dev
)
348 return dev
->vhost_ops
->vhost_requires_shm_log
&&
349 dev
->vhost_ops
->vhost_requires_shm_log(dev
);
352 static inline void vhost_dev_log_resize(struct vhost_dev
*dev
, uint64_t size
)
354 struct vhost_log
*log
= vhost_log_get(size
, vhost_dev_log_is_shared(dev
));
355 uint64_t log_base
= (uintptr_t)log
->log
;
358 /* inform backend of log switching, this must be done before
359 releasing the current log, to ensure no logging is lost */
360 r
= dev
->vhost_ops
->vhost_set_log_base(dev
, log_base
, log
);
362 VHOST_OPS_DEBUG(r
, "vhost_set_log_base failed");
365 vhost_log_put(dev
, true);
367 dev
->log_size
= size
;
370 static void *vhost_memory_map(struct vhost_dev
*dev
, hwaddr addr
,
371 hwaddr
*plen
, bool is_write
)
373 if (!vhost_dev_has_iommu(dev
)) {
374 return cpu_physical_memory_map(addr
, plen
, is_write
);
376 return (void *)(uintptr_t)addr
;
380 static void vhost_memory_unmap(struct vhost_dev
*dev
, void *buffer
,
381 hwaddr len
, int is_write
,
384 if (!vhost_dev_has_iommu(dev
)) {
385 cpu_physical_memory_unmap(buffer
, len
, is_write
, access_len
);
389 static int vhost_verify_ring_part_mapping(void *ring_hva
,
396 uint64_t hva_ring_offset
;
397 uint64_t ring_last
= range_get_last(ring_gpa
, ring_size
);
398 uint64_t reg_last
= range_get_last(reg_gpa
, reg_size
);
400 if (ring_last
< reg_gpa
|| ring_gpa
> reg_last
) {
403 /* check that whole ring's is mapped */
404 if (ring_last
> reg_last
) {
407 /* check that ring's MemoryRegion wasn't replaced */
408 hva_ring_offset
= ring_gpa
- reg_gpa
;
409 if (ring_hva
!= reg_hva
+ hva_ring_offset
) {
416 static int vhost_verify_ring_mappings(struct vhost_dev
*dev
,
423 const char *part_name
[] = {
429 if (vhost_dev_has_iommu(dev
)) {
433 for (i
= 0; i
< dev
->nvqs
; ++i
) {
434 struct vhost_virtqueue
*vq
= dev
->vqs
+ i
;
436 if (vq
->desc_phys
== 0) {
441 r
= vhost_verify_ring_part_mapping(
442 vq
->desc
, vq
->desc_phys
, vq
->desc_size
,
443 reg_hva
, reg_gpa
, reg_size
);
449 r
= vhost_verify_ring_part_mapping(
450 vq
->avail
, vq
->avail_phys
, vq
->avail_size
,
451 reg_hva
, reg_gpa
, reg_size
);
457 r
= vhost_verify_ring_part_mapping(
458 vq
->used
, vq
->used_phys
, vq
->used_size
,
459 reg_hva
, reg_gpa
, reg_size
);
466 error_report("Unable to map %s for ring %d", part_name
[j
], i
);
467 } else if (r
== -EBUSY
) {
468 error_report("%s relocated for ring %d", part_name
[j
], i
);
474 * vhost_section: identify sections needed for vhost access
476 * We only care about RAM sections here (where virtqueue and guest
477 * internals accessed by virtio might live). If we find one we still
478 * allow the backend to potentially filter it out of our list.
480 static bool vhost_section(struct vhost_dev
*dev
, MemoryRegionSection
*section
)
482 MemoryRegion
*mr
= section
->mr
;
484 if (memory_region_is_ram(mr
) && !memory_region_is_rom(mr
)) {
485 uint8_t dirty_mask
= memory_region_get_dirty_log_mask(mr
);
486 uint8_t handled_dirty
;
489 * Kernel based vhost doesn't handle any block which is doing
490 * dirty-tracking other than migration for which it has
491 * specific logging support. However for TCG the kernel never
492 * gets involved anyway so we can also ignore it's
493 * self-modiying code detection flags. However a vhost-user
494 * client could still confuse a TCG guest if it re-writes
495 * executable memory that has already been translated.
497 handled_dirty
= (1 << DIRTY_MEMORY_MIGRATION
) |
498 (1 << DIRTY_MEMORY_CODE
);
500 if (dirty_mask
& ~handled_dirty
) {
501 trace_vhost_reject_section(mr
->name
, 1);
505 if (dev
->vhost_ops
->vhost_backend_mem_section_filter
&&
506 !dev
->vhost_ops
->vhost_backend_mem_section_filter(dev
, section
)) {
507 trace_vhost_reject_section(mr
->name
, 2);
511 trace_vhost_section(mr
->name
);
514 trace_vhost_reject_section(mr
->name
, 3);
519 static void vhost_begin(MemoryListener
*listener
)
521 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
523 dev
->tmp_sections
= NULL
;
524 dev
->n_tmp_sections
= 0;
527 static void vhost_commit(MemoryListener
*listener
)
529 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
531 MemoryRegionSection
*old_sections
;
537 bool changed
= false;
539 /* Note we can be called before the device is started, but then
540 * starting the device calls set_mem_table, so we need to have
541 * built the data structures.
543 old_sections
= dev
->mem_sections
;
544 n_old_sections
= dev
->n_mem_sections
;
545 dev
->mem_sections
= dev
->tmp_sections
;
546 dev
->n_mem_sections
= dev
->n_tmp_sections
;
548 if (dev
->n_mem_sections
!= n_old_sections
) {
551 /* Same size, lets check the contents */
552 for (int i
= 0; i
< n_old_sections
; i
++) {
553 if (!MemoryRegionSection_eq(&old_sections
[i
],
554 &dev
->mem_sections
[i
])) {
561 trace_vhost_commit(dev
->started
, changed
);
566 /* Rebuild the regions list from the new sections list */
567 regions_size
= offsetof(struct vhost_memory
, regions
) +
568 dev
->n_mem_sections
* sizeof dev
->mem
->regions
[0];
569 dev
->mem
= g_realloc(dev
->mem
, regions_size
);
570 dev
->mem
->nregions
= dev
->n_mem_sections
;
571 used_memslots
= dev
->mem
->nregions
;
572 for (i
= 0; i
< dev
->n_mem_sections
; i
++) {
573 struct vhost_memory_region
*cur_vmr
= dev
->mem
->regions
+ i
;
574 struct MemoryRegionSection
*mrs
= dev
->mem_sections
+ i
;
576 cur_vmr
->guest_phys_addr
= mrs
->offset_within_address_space
;
577 cur_vmr
->memory_size
= int128_get64(mrs
->size
);
578 cur_vmr
->userspace_addr
=
579 (uintptr_t)memory_region_get_ram_ptr(mrs
->mr
) +
580 mrs
->offset_within_region
;
581 cur_vmr
->flags_padding
= 0;
588 for (i
= 0; i
< dev
->mem
->nregions
; i
++) {
589 if (vhost_verify_ring_mappings(dev
,
590 (void *)(uintptr_t)dev
->mem
->regions
[i
].userspace_addr
,
591 dev
->mem
->regions
[i
].guest_phys_addr
,
592 dev
->mem
->regions
[i
].memory_size
)) {
593 error_report("Verify ring failure on region %d", i
);
598 if (!dev
->log_enabled
) {
599 r
= dev
->vhost_ops
->vhost_set_mem_table(dev
, dev
->mem
);
601 VHOST_OPS_DEBUG(r
, "vhost_set_mem_table failed");
605 log_size
= vhost_get_log_size(dev
);
606 /* We allocate an extra 4K bytes to log,
607 * to reduce the * number of reallocations. */
608 #define VHOST_LOG_BUFFER (0x1000 / sizeof *dev->log)
609 /* To log more, must increase log size before table update. */
610 if (dev
->log_size
< log_size
) {
611 vhost_dev_log_resize(dev
, log_size
+ VHOST_LOG_BUFFER
);
613 r
= dev
->vhost_ops
->vhost_set_mem_table(dev
, dev
->mem
);
615 VHOST_OPS_DEBUG(r
, "vhost_set_mem_table failed");
617 /* To log less, can only decrease log size after table update. */
618 if (dev
->log_size
> log_size
+ VHOST_LOG_BUFFER
) {
619 vhost_dev_log_resize(dev
, log_size
);
623 /* Deref the old list of sections, this must happen _after_ the
624 * vhost_set_mem_table to ensure the client isn't still using the
625 * section we're about to unref.
627 while (n_old_sections
--) {
628 memory_region_unref(old_sections
[n_old_sections
].mr
);
630 g_free(old_sections
);
634 /* Adds the section data to the tmp_section structure.
635 * It relies on the listener calling us in memory address order
636 * and for each region (via the _add and _nop methods) to
639 static void vhost_region_add_section(struct vhost_dev
*dev
,
640 MemoryRegionSection
*section
)
642 bool need_add
= true;
643 uint64_t mrs_size
= int128_get64(section
->size
);
644 uint64_t mrs_gpa
= section
->offset_within_address_space
;
645 uintptr_t mrs_host
= (uintptr_t)memory_region_get_ram_ptr(section
->mr
) +
646 section
->offset_within_region
;
647 RAMBlock
*mrs_rb
= section
->mr
->ram_block
;
649 trace_vhost_region_add_section(section
->mr
->name
, mrs_gpa
, mrs_size
,
652 if (dev
->vhost_ops
->backend_type
== VHOST_BACKEND_TYPE_USER
) {
653 /* Round the section to it's page size */
654 /* First align the start down to a page boundary */
655 size_t mrs_page
= qemu_ram_pagesize(mrs_rb
);
656 uint64_t alignage
= mrs_host
& (mrs_page
- 1);
658 mrs_host
-= alignage
;
659 mrs_size
+= alignage
;
662 /* Now align the size up to a page boundary */
663 alignage
= mrs_size
& (mrs_page
- 1);
665 mrs_size
+= mrs_page
- alignage
;
667 trace_vhost_region_add_section_aligned(section
->mr
->name
, mrs_gpa
,
671 if (dev
->n_tmp_sections
) {
672 /* Since we already have at least one section, lets see if
673 * this extends it; since we're scanning in order, we only
674 * have to look at the last one, and the FlatView that calls
675 * us shouldn't have overlaps.
677 MemoryRegionSection
*prev_sec
= dev
->tmp_sections
+
678 (dev
->n_tmp_sections
- 1);
679 uint64_t prev_gpa_start
= prev_sec
->offset_within_address_space
;
680 uint64_t prev_size
= int128_get64(prev_sec
->size
);
681 uint64_t prev_gpa_end
= range_get_last(prev_gpa_start
, prev_size
);
682 uint64_t prev_host_start
=
683 (uintptr_t)memory_region_get_ram_ptr(prev_sec
->mr
) +
684 prev_sec
->offset_within_region
;
685 uint64_t prev_host_end
= range_get_last(prev_host_start
, prev_size
);
687 if (mrs_gpa
<= (prev_gpa_end
+ 1)) {
688 /* OK, looks like overlapping/intersecting - it's possible that
689 * the rounding to page sizes has made them overlap, but they should
690 * match up in the same RAMBlock if they do.
692 if (mrs_gpa
< prev_gpa_start
) {
693 error_report("%s:Section '%s' rounded to %"PRIx64
694 " prior to previous '%s' %"PRIx64
,
695 __func__
, section
->mr
->name
, mrs_gpa
,
696 prev_sec
->mr
->name
, prev_gpa_start
);
697 /* A way to cleanly fail here would be better */
700 /* Offset from the start of the previous GPA to this GPA */
701 size_t offset
= mrs_gpa
- prev_gpa_start
;
703 if (prev_host_start
+ offset
== mrs_host
&&
704 section
->mr
== prev_sec
->mr
&&
705 (!dev
->vhost_ops
->vhost_backend_can_merge
||
706 dev
->vhost_ops
->vhost_backend_can_merge(dev
,
708 prev_host_start
, prev_size
))) {
709 uint64_t max_end
= MAX(prev_host_end
, mrs_host
+ mrs_size
);
711 prev_sec
->offset_within_address_space
=
712 MIN(prev_gpa_start
, mrs_gpa
);
713 prev_sec
->offset_within_region
=
714 MIN(prev_host_start
, mrs_host
) -
715 (uintptr_t)memory_region_get_ram_ptr(prev_sec
->mr
);
716 prev_sec
->size
= int128_make64(max_end
- MIN(prev_host_start
,
718 trace_vhost_region_add_section_merge(section
->mr
->name
,
719 int128_get64(prev_sec
->size
),
720 prev_sec
->offset_within_address_space
,
721 prev_sec
->offset_within_region
);
723 /* adjoining regions are fine, but overlapping ones with
724 * different blocks/offsets shouldn't happen
726 if (mrs_gpa
!= prev_gpa_end
+ 1) {
727 error_report("%s: Overlapping but not coherent sections "
737 ++dev
->n_tmp_sections
;
738 dev
->tmp_sections
= g_renew(MemoryRegionSection
, dev
->tmp_sections
,
739 dev
->n_tmp_sections
);
740 dev
->tmp_sections
[dev
->n_tmp_sections
- 1] = *section
;
741 /* The flatview isn't stable and we don't use it, making it NULL
742 * means we can memcmp the list.
744 dev
->tmp_sections
[dev
->n_tmp_sections
- 1].fv
= NULL
;
745 memory_region_ref(section
->mr
);
749 /* Used for both add and nop callbacks */
750 static void vhost_region_addnop(MemoryListener
*listener
,
751 MemoryRegionSection
*section
)
753 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
756 if (!vhost_section(dev
, section
)) {
759 vhost_region_add_section(dev
, section
);
762 static void vhost_iommu_unmap_notify(IOMMUNotifier
*n
, IOMMUTLBEntry
*iotlb
)
764 struct vhost_iommu
*iommu
= container_of(n
, struct vhost_iommu
, n
);
765 struct vhost_dev
*hdev
= iommu
->hdev
;
766 hwaddr iova
= iotlb
->iova
+ iommu
->iommu_offset
;
768 if (vhost_backend_invalidate_device_iotlb(hdev
, iova
,
769 iotlb
->addr_mask
+ 1)) {
770 error_report("Fail to invalidate device iotlb");
774 static void vhost_iommu_region_add(MemoryListener
*listener
,
775 MemoryRegionSection
*section
)
777 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
779 struct vhost_iommu
*iommu
;
782 IOMMUMemoryRegion
*iommu_mr
;
784 if (!memory_region_is_iommu(section
->mr
)) {
788 iommu_mr
= IOMMU_MEMORY_REGION(section
->mr
);
790 iommu
= g_malloc0(sizeof(*iommu
));
791 end
= int128_add(int128_make64(section
->offset_within_region
),
793 end
= int128_sub(end
, int128_one());
794 iommu_idx
= memory_region_iommu_attrs_to_index(iommu_mr
,
795 MEMTXATTRS_UNSPECIFIED
);
796 iommu_notifier_init(&iommu
->n
, vhost_iommu_unmap_notify
,
797 dev
->vdev
->device_iotlb_enabled
?
798 IOMMU_NOTIFIER_DEVIOTLB_UNMAP
:
799 IOMMU_NOTIFIER_UNMAP
,
800 section
->offset_within_region
,
803 iommu
->mr
= section
->mr
;
804 iommu
->iommu_offset
= section
->offset_within_address_space
-
805 section
->offset_within_region
;
807 memory_region_register_iommu_notifier(section
->mr
, &iommu
->n
,
809 QLIST_INSERT_HEAD(&dev
->iommu_list
, iommu
, iommu_next
);
810 /* TODO: can replay help performance here? */
813 static void vhost_iommu_region_del(MemoryListener
*listener
,
814 MemoryRegionSection
*section
)
816 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
818 struct vhost_iommu
*iommu
;
820 if (!memory_region_is_iommu(section
->mr
)) {
824 QLIST_FOREACH(iommu
, &dev
->iommu_list
, iommu_next
) {
825 if (iommu
->mr
== section
->mr
&&
826 iommu
->n
.start
== section
->offset_within_region
) {
827 memory_region_unregister_iommu_notifier(iommu
->mr
,
829 QLIST_REMOVE(iommu
, iommu_next
);
836 void vhost_toggle_device_iotlb(VirtIODevice
*vdev
)
838 VirtioDeviceClass
*vdc
= VIRTIO_DEVICE_GET_CLASS(vdev
);
839 struct vhost_dev
*dev
;
840 struct vhost_iommu
*iommu
;
842 if (vdev
->vhost_started
) {
843 dev
= vdc
->get_vhost(vdev
);
848 QLIST_FOREACH(iommu
, &dev
->iommu_list
, iommu_next
) {
849 memory_region_unregister_iommu_notifier(iommu
->mr
, &iommu
->n
);
850 iommu
->n
.notifier_flags
= vdev
->device_iotlb_enabled
?
851 IOMMU_NOTIFIER_DEVIOTLB_UNMAP
: IOMMU_NOTIFIER_UNMAP
;
852 memory_region_register_iommu_notifier(iommu
->mr
, &iommu
->n
,
857 static int vhost_virtqueue_set_addr(struct vhost_dev
*dev
,
858 struct vhost_virtqueue
*vq
,
859 unsigned idx
, bool enable_log
)
861 struct vhost_vring_addr addr
;
863 memset(&addr
, 0, sizeof(struct vhost_vring_addr
));
865 if (dev
->vhost_ops
->vhost_vq_get_addr
) {
866 r
= dev
->vhost_ops
->vhost_vq_get_addr(dev
, &addr
, vq
);
868 VHOST_OPS_DEBUG(r
, "vhost_vq_get_addr failed");
872 addr
.desc_user_addr
= (uint64_t)(unsigned long)vq
->desc
;
873 addr
.avail_user_addr
= (uint64_t)(unsigned long)vq
->avail
;
874 addr
.used_user_addr
= (uint64_t)(unsigned long)vq
->used
;
877 addr
.log_guest_addr
= vq
->used_phys
;
878 addr
.flags
= enable_log
? (1 << VHOST_VRING_F_LOG
) : 0;
879 r
= dev
->vhost_ops
->vhost_set_vring_addr(dev
, &addr
);
881 VHOST_OPS_DEBUG(r
, "vhost_set_vring_addr failed");
886 static int vhost_dev_set_features(struct vhost_dev
*dev
,
889 uint64_t features
= dev
->acked_features
;
892 features
|= 0x1ULL
<< VHOST_F_LOG_ALL
;
894 if (!vhost_dev_has_iommu(dev
)) {
895 features
&= ~(0x1ULL
<< VIRTIO_F_IOMMU_PLATFORM
);
897 if (dev
->vhost_ops
->vhost_force_iommu
) {
898 if (dev
->vhost_ops
->vhost_force_iommu(dev
) == true) {
899 features
|= 0x1ULL
<< VIRTIO_F_IOMMU_PLATFORM
;
902 r
= dev
->vhost_ops
->vhost_set_features(dev
, features
);
904 VHOST_OPS_DEBUG(r
, "vhost_set_features failed");
907 if (dev
->vhost_ops
->vhost_set_backend_cap
) {
908 r
= dev
->vhost_ops
->vhost_set_backend_cap(dev
);
910 VHOST_OPS_DEBUG(r
, "vhost_set_backend_cap failed");
919 static int vhost_dev_set_log(struct vhost_dev
*dev
, bool enable_log
)
924 r
= vhost_dev_set_features(dev
, enable_log
);
928 for (i
= 0; i
< dev
->nvqs
; ++i
) {
929 idx
= dev
->vhost_ops
->vhost_get_vq_index(dev
, dev
->vq_index
+ i
);
930 addr
= virtio_queue_get_desc_addr(dev
->vdev
, idx
);
933 * The queue might not be ready for start. If this
934 * is the case there is no reason to continue the process.
935 * The similar logic is used by the vhost_virtqueue_start()
940 r
= vhost_virtqueue_set_addr(dev
, dev
->vqs
+ i
, idx
,
948 for (; i
>= 0; --i
) {
949 idx
= dev
->vhost_ops
->vhost_get_vq_index(dev
, dev
->vq_index
+ i
);
950 addr
= virtio_queue_get_desc_addr(dev
->vdev
, idx
);
954 vhost_virtqueue_set_addr(dev
, dev
->vqs
+ i
, idx
,
957 vhost_dev_set_features(dev
, dev
->log_enabled
);
962 static int vhost_migration_log(MemoryListener
*listener
, bool enable
)
964 struct vhost_dev
*dev
= container_of(listener
, struct vhost_dev
,
967 if (enable
== dev
->log_enabled
) {
971 dev
->log_enabled
= enable
;
977 r
= vhost_dev_set_log(dev
, false);
979 goto check_dev_state
;
981 vhost_log_put(dev
, false);
983 vhost_dev_log_resize(dev
, vhost_get_log_size(dev
));
984 r
= vhost_dev_set_log(dev
, true);
986 goto check_dev_state
;
991 dev
->log_enabled
= enable
;
993 * vhost-user-* devices could change their state during log
994 * initialization due to disconnect. So check dev state after
995 * vhost communication.
999 * Since device is in the stopped state, it is okay for
1000 * migration. Return success.
1005 /* An error occurred. */
1006 dev
->log_enabled
= false;
1012 static void vhost_log_global_start(MemoryListener
*listener
)
1016 r
= vhost_migration_log(listener
, true);
1022 static void vhost_log_global_stop(MemoryListener
*listener
)
1026 r
= vhost_migration_log(listener
, false);
1032 static void vhost_log_start(MemoryListener
*listener
,
1033 MemoryRegionSection
*section
,
1036 /* FIXME: implement */
1039 static void vhost_log_stop(MemoryListener
*listener
,
1040 MemoryRegionSection
*section
,
1043 /* FIXME: implement */
1046 /* The vhost driver natively knows how to handle the vrings of non
1047 * cross-endian legacy devices and modern devices. Only legacy devices
1048 * exposed to a bi-endian guest may require the vhost driver to use a
1049 * specific endianness.
1051 static inline bool vhost_needs_vring_endian(VirtIODevice
*vdev
)
1053 if (virtio_vdev_has_feature(vdev
, VIRTIO_F_VERSION_1
)) {
1057 return vdev
->device_endian
== VIRTIO_DEVICE_ENDIAN_LITTLE
;
1059 return vdev
->device_endian
== VIRTIO_DEVICE_ENDIAN_BIG
;
1063 static int vhost_virtqueue_set_vring_endian_legacy(struct vhost_dev
*dev
,
1068 struct vhost_vring_state s
= {
1069 .index
= vhost_vq_index
,
1070 .num
= is_big_endian
1073 r
= dev
->vhost_ops
->vhost_set_vring_endian(dev
, &s
);
1075 VHOST_OPS_DEBUG(r
, "vhost_set_vring_endian failed");
1080 static int vhost_memory_region_lookup(struct vhost_dev
*hdev
,
1081 uint64_t gpa
, uint64_t *uaddr
,
1086 for (i
= 0; i
< hdev
->mem
->nregions
; i
++) {
1087 struct vhost_memory_region
*reg
= hdev
->mem
->regions
+ i
;
1089 if (gpa
>= reg
->guest_phys_addr
&&
1090 reg
->guest_phys_addr
+ reg
->memory_size
> gpa
) {
1091 *uaddr
= reg
->userspace_addr
+ gpa
- reg
->guest_phys_addr
;
1092 *len
= reg
->guest_phys_addr
+ reg
->memory_size
- gpa
;
1100 int vhost_device_iotlb_miss(struct vhost_dev
*dev
, uint64_t iova
, int write
)
1102 IOMMUTLBEntry iotlb
;
1103 uint64_t uaddr
, len
;
1106 RCU_READ_LOCK_GUARD();
1108 trace_vhost_iotlb_miss(dev
, 1);
1110 iotlb
= address_space_get_iotlb_entry(dev
->vdev
->dma_as
,
1112 MEMTXATTRS_UNSPECIFIED
);
1113 if (iotlb
.target_as
!= NULL
) {
1114 ret
= vhost_memory_region_lookup(dev
, iotlb
.translated_addr
,
1117 trace_vhost_iotlb_miss(dev
, 3);
1118 error_report("Fail to lookup the translated address "
1119 "%"PRIx64
, iotlb
.translated_addr
);
1123 len
= MIN(iotlb
.addr_mask
+ 1, len
);
1124 iova
= iova
& ~iotlb
.addr_mask
;
1126 ret
= vhost_backend_update_device_iotlb(dev
, iova
, uaddr
,
1129 trace_vhost_iotlb_miss(dev
, 4);
1130 error_report("Fail to update device iotlb");
1135 trace_vhost_iotlb_miss(dev
, 2);
1141 int vhost_virtqueue_start(struct vhost_dev
*dev
,
1142 struct VirtIODevice
*vdev
,
1143 struct vhost_virtqueue
*vq
,
1146 BusState
*qbus
= BUS(qdev_get_parent_bus(DEVICE(vdev
)));
1147 VirtioBusState
*vbus
= VIRTIO_BUS(qbus
);
1148 VirtioBusClass
*k
= VIRTIO_BUS_GET_CLASS(vbus
);
1151 int vhost_vq_index
= dev
->vhost_ops
->vhost_get_vq_index(dev
, idx
);
1152 struct vhost_vring_file file
= {
1153 .index
= vhost_vq_index
1155 struct vhost_vring_state state
= {
1156 .index
= vhost_vq_index
1158 struct VirtQueue
*vvq
= virtio_get_queue(vdev
, idx
);
1160 a
= virtio_queue_get_desc_addr(vdev
, idx
);
1162 /* Queue might not be ready for start */
1166 vq
->num
= state
.num
= virtio_queue_get_num(vdev
, idx
);
1167 r
= dev
->vhost_ops
->vhost_set_vring_num(dev
, &state
);
1169 VHOST_OPS_DEBUG(r
, "vhost_set_vring_num failed");
1173 state
.num
= virtio_queue_get_last_avail_idx(vdev
, idx
);
1174 r
= dev
->vhost_ops
->vhost_set_vring_base(dev
, &state
);
1176 VHOST_OPS_DEBUG(r
, "vhost_set_vring_base failed");
1180 if (vhost_needs_vring_endian(vdev
)) {
1181 r
= vhost_virtqueue_set_vring_endian_legacy(dev
,
1182 virtio_is_big_endian(vdev
),
1189 vq
->desc_size
= s
= l
= virtio_queue_get_desc_size(vdev
, idx
);
1191 vq
->desc
= vhost_memory_map(dev
, a
, &l
, false);
1192 if (!vq
->desc
|| l
!= s
) {
1194 goto fail_alloc_desc
;
1196 vq
->avail_size
= s
= l
= virtio_queue_get_avail_size(vdev
, idx
);
1197 vq
->avail_phys
= a
= virtio_queue_get_avail_addr(vdev
, idx
);
1198 vq
->avail
= vhost_memory_map(dev
, a
, &l
, false);
1199 if (!vq
->avail
|| l
!= s
) {
1201 goto fail_alloc_avail
;
1203 vq
->used_size
= s
= l
= virtio_queue_get_used_size(vdev
, idx
);
1204 vq
->used_phys
= a
= virtio_queue_get_used_addr(vdev
, idx
);
1205 vq
->used
= vhost_memory_map(dev
, a
, &l
, true);
1206 if (!vq
->used
|| l
!= s
) {
1208 goto fail_alloc_used
;
1211 r
= vhost_virtqueue_set_addr(dev
, vq
, vhost_vq_index
, dev
->log_enabled
);
1216 file
.fd
= event_notifier_get_fd(virtio_queue_get_host_notifier(vvq
));
1217 r
= dev
->vhost_ops
->vhost_set_vring_kick(dev
, &file
);
1219 VHOST_OPS_DEBUG(r
, "vhost_set_vring_kick failed");
1223 /* Clear and discard previous events if any. */
1224 event_notifier_test_and_clear(&vq
->masked_notifier
);
1226 /* Init vring in unmasked state, unless guest_notifier_mask
1229 if (!vdev
->use_guest_notifier_mask
) {
1230 /* TODO: check and handle errors. */
1231 vhost_virtqueue_mask(dev
, vdev
, idx
, false);
1234 if (k
->query_guest_notifiers
&&
1235 k
->query_guest_notifiers(qbus
->parent
) &&
1236 virtio_queue_vector(vdev
, idx
) == VIRTIO_NO_VECTOR
) {
1238 r
= dev
->vhost_ops
->vhost_set_vring_call(dev
, &file
);
1249 vhost_memory_unmap(dev
, vq
->used
, virtio_queue_get_used_size(vdev
, idx
),
1252 vhost_memory_unmap(dev
, vq
->avail
, virtio_queue_get_avail_size(vdev
, idx
),
1255 vhost_memory_unmap(dev
, vq
->desc
, virtio_queue_get_desc_size(vdev
, idx
),
1261 void vhost_virtqueue_stop(struct vhost_dev
*dev
,
1262 struct VirtIODevice
*vdev
,
1263 struct vhost_virtqueue
*vq
,
1266 int vhost_vq_index
= dev
->vhost_ops
->vhost_get_vq_index(dev
, idx
);
1267 struct vhost_vring_state state
= {
1268 .index
= vhost_vq_index
,
1272 if (virtio_queue_get_desc_addr(vdev
, idx
) == 0) {
1273 /* Don't stop the virtqueue which might have not been started */
1277 r
= dev
->vhost_ops
->vhost_get_vring_base(dev
, &state
);
1279 VHOST_OPS_DEBUG(r
, "vhost VQ %u ring restore failed: %d", idx
, r
);
1280 /* Connection to the backend is broken, so let's sync internal
1281 * last avail idx to the device used idx.
1283 virtio_queue_restore_last_avail_idx(vdev
, idx
);
1285 virtio_queue_set_last_avail_idx(vdev
, idx
, state
.num
);
1287 virtio_queue_invalidate_signalled_used(vdev
, idx
);
1288 virtio_queue_update_used_idx(vdev
, idx
);
1290 /* In the cross-endian case, we need to reset the vring endianness to
1291 * native as legacy devices expect so by default.
1293 if (vhost_needs_vring_endian(vdev
)) {
1294 vhost_virtqueue_set_vring_endian_legacy(dev
,
1295 !virtio_is_big_endian(vdev
),
1299 vhost_memory_unmap(dev
, vq
->used
, virtio_queue_get_used_size(vdev
, idx
),
1300 1, virtio_queue_get_used_size(vdev
, idx
));
1301 vhost_memory_unmap(dev
, vq
->avail
, virtio_queue_get_avail_size(vdev
, idx
),
1302 0, virtio_queue_get_avail_size(vdev
, idx
));
1303 vhost_memory_unmap(dev
, vq
->desc
, virtio_queue_get_desc_size(vdev
, idx
),
1304 0, virtio_queue_get_desc_size(vdev
, idx
));
1307 static int vhost_virtqueue_set_busyloop_timeout(struct vhost_dev
*dev
,
1308 int n
, uint32_t timeout
)
1310 int vhost_vq_index
= dev
->vhost_ops
->vhost_get_vq_index(dev
, n
);
1311 struct vhost_vring_state state
= {
1312 .index
= vhost_vq_index
,
1317 if (!dev
->vhost_ops
->vhost_set_vring_busyloop_timeout
) {
1321 r
= dev
->vhost_ops
->vhost_set_vring_busyloop_timeout(dev
, &state
);
1323 VHOST_OPS_DEBUG(r
, "vhost_set_vring_busyloop_timeout failed");
1330 static void vhost_virtqueue_error_notifier(EventNotifier
*n
)
1332 struct vhost_virtqueue
*vq
= container_of(n
, struct vhost_virtqueue
,
1334 struct vhost_dev
*dev
= vq
->dev
;
1335 int index
= vq
- dev
->vqs
;
1337 if (event_notifier_test_and_clear(n
) && dev
->vdev
) {
1338 VHOST_OPS_DEBUG(-EINVAL
, "vhost vring error in virtqueue %d",
1339 dev
->vq_index
+ index
);
1343 static int vhost_virtqueue_init(struct vhost_dev
*dev
,
1344 struct vhost_virtqueue
*vq
, int n
)
1346 int vhost_vq_index
= dev
->vhost_ops
->vhost_get_vq_index(dev
, n
);
1347 struct vhost_vring_file file
= {
1348 .index
= vhost_vq_index
,
1350 int r
= event_notifier_init(&vq
->masked_notifier
, 0);
1355 file
.fd
= event_notifier_get_wfd(&vq
->masked_notifier
);
1356 r
= dev
->vhost_ops
->vhost_set_vring_call(dev
, &file
);
1358 VHOST_OPS_DEBUG(r
, "vhost_set_vring_call failed");
1364 if (dev
->vhost_ops
->vhost_set_vring_err
) {
1365 r
= event_notifier_init(&vq
->error_notifier
, 0);
1370 file
.fd
= event_notifier_get_fd(&vq
->error_notifier
);
1371 r
= dev
->vhost_ops
->vhost_set_vring_err(dev
, &file
);
1373 VHOST_OPS_DEBUG(r
, "vhost_set_vring_err failed");
1377 event_notifier_set_handler(&vq
->error_notifier
,
1378 vhost_virtqueue_error_notifier
);
1384 event_notifier_cleanup(&vq
->error_notifier
);
1386 event_notifier_cleanup(&vq
->masked_notifier
);
1390 static void vhost_virtqueue_cleanup(struct vhost_virtqueue
*vq
)
1392 event_notifier_cleanup(&vq
->masked_notifier
);
1393 if (vq
->dev
->vhost_ops
->vhost_set_vring_err
) {
1394 event_notifier_set_handler(&vq
->error_notifier
, NULL
);
1395 event_notifier_cleanup(&vq
->error_notifier
);
1399 int vhost_dev_init(struct vhost_dev
*hdev
, void *opaque
,
1400 VhostBackendType backend_type
, uint32_t busyloop_timeout
,
1404 int i
, r
, n_initialized_vqs
= 0;
1407 hdev
->migration_blocker
= NULL
;
1409 r
= vhost_set_backend_type(hdev
, backend_type
);
1412 r
= hdev
->vhost_ops
->vhost_backend_init(hdev
, opaque
, errp
);
1417 r
= hdev
->vhost_ops
->vhost_set_owner(hdev
);
1419 error_setg_errno(errp
, -r
, "vhost_set_owner failed");
1423 r
= hdev
->vhost_ops
->vhost_get_features(hdev
, &features
);
1425 error_setg_errno(errp
, -r
, "vhost_get_features failed");
1429 for (i
= 0; i
< hdev
->nvqs
; ++i
, ++n_initialized_vqs
) {
1430 r
= vhost_virtqueue_init(hdev
, hdev
->vqs
+ i
, hdev
->vq_index
+ i
);
1432 error_setg_errno(errp
, -r
, "Failed to initialize virtqueue %d", i
);
1437 if (busyloop_timeout
) {
1438 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1439 r
= vhost_virtqueue_set_busyloop_timeout(hdev
, hdev
->vq_index
+ i
,
1442 error_setg_errno(errp
, -r
, "Failed to set busyloop timeout");
1448 hdev
->features
= features
;
1450 hdev
->memory_listener
= (MemoryListener
) {
1452 .begin
= vhost_begin
,
1453 .commit
= vhost_commit
,
1454 .region_add
= vhost_region_addnop
,
1455 .region_nop
= vhost_region_addnop
,
1456 .log_start
= vhost_log_start
,
1457 .log_stop
= vhost_log_stop
,
1458 .log_sync
= vhost_log_sync
,
1459 .log_global_start
= vhost_log_global_start
,
1460 .log_global_stop
= vhost_log_global_stop
,
1461 .priority
= MEMORY_LISTENER_PRIORITY_DEV_BACKEND
1464 hdev
->iommu_listener
= (MemoryListener
) {
1465 .name
= "vhost-iommu",
1466 .region_add
= vhost_iommu_region_add
,
1467 .region_del
= vhost_iommu_region_del
,
1470 if (hdev
->migration_blocker
== NULL
) {
1471 if (!(hdev
->features
& (0x1ULL
<< VHOST_F_LOG_ALL
))) {
1472 error_setg(&hdev
->migration_blocker
,
1473 "Migration disabled: vhost lacks VHOST_F_LOG_ALL feature.");
1474 } else if (vhost_dev_log_is_shared(hdev
) && !qemu_memfd_alloc_check()) {
1475 error_setg(&hdev
->migration_blocker
,
1476 "Migration disabled: failed to allocate shared memory");
1480 if (hdev
->migration_blocker
!= NULL
) {
1481 r
= migrate_add_blocker(hdev
->migration_blocker
, errp
);
1483 error_free(hdev
->migration_blocker
);
1488 hdev
->mem
= g_malloc0(offsetof(struct vhost_memory
, regions
));
1489 hdev
->n_mem_sections
= 0;
1490 hdev
->mem_sections
= NULL
;
1493 hdev
->log_enabled
= false;
1494 hdev
->started
= false;
1495 memory_listener_register(&hdev
->memory_listener
, &address_space_memory
);
1496 QLIST_INSERT_HEAD(&vhost_devices
, hdev
, entry
);
1498 if (used_memslots
> hdev
->vhost_ops
->vhost_backend_memslots_limit(hdev
)) {
1499 error_setg(errp
, "vhost backend memory slots limit is less"
1500 " than current number of present memory slots");
1508 if (busyloop_timeout
) {
1510 vhost_virtqueue_set_busyloop_timeout(hdev
, hdev
->vq_index
+ i
, 0);
1514 hdev
->nvqs
= n_initialized_vqs
;
1515 vhost_dev_cleanup(hdev
);
1519 void vhost_dev_cleanup(struct vhost_dev
*hdev
)
1523 trace_vhost_dev_cleanup(hdev
);
1525 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1526 vhost_virtqueue_cleanup(hdev
->vqs
+ i
);
1529 /* those are only safe after successful init */
1530 memory_listener_unregister(&hdev
->memory_listener
);
1531 QLIST_REMOVE(hdev
, entry
);
1533 if (hdev
->migration_blocker
) {
1534 migrate_del_blocker(hdev
->migration_blocker
);
1535 error_free(hdev
->migration_blocker
);
1538 g_free(hdev
->mem_sections
);
1539 if (hdev
->vhost_ops
) {
1540 hdev
->vhost_ops
->vhost_backend_cleanup(hdev
);
1544 memset(hdev
, 0, sizeof(struct vhost_dev
));
1547 static void vhost_dev_disable_notifiers_nvqs(struct vhost_dev
*hdev
,
1551 BusState
*qbus
= BUS(qdev_get_parent_bus(DEVICE(vdev
)));
1555 * Batch all the host notifiers in a single transaction to avoid
1556 * quadratic time complexity in address_space_update_ioeventfds().
1558 memory_region_transaction_begin();
1560 for (i
= 0; i
< nvqs
; ++i
) {
1561 r
= virtio_bus_set_host_notifier(VIRTIO_BUS(qbus
), hdev
->vq_index
+ i
,
1564 error_report("vhost VQ %d notifier cleanup failed: %d", i
, -r
);
1570 * The transaction expects the ioeventfds to be open when it
1571 * commits. Do it now, before the cleanup loop.
1573 memory_region_transaction_commit();
1575 for (i
= 0; i
< nvqs
; ++i
) {
1576 virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus
), hdev
->vq_index
+ i
);
1578 virtio_device_release_ioeventfd(vdev
);
1581 /* Stop processing guest IO notifications in qemu.
1582 * Start processing them in vhost in kernel.
1584 int vhost_dev_enable_notifiers(struct vhost_dev
*hdev
, VirtIODevice
*vdev
)
1586 BusState
*qbus
= BUS(qdev_get_parent_bus(DEVICE(vdev
)));
1589 /* We will pass the notifiers to the kernel, make sure that QEMU
1590 * doesn't interfere.
1592 r
= virtio_device_grab_ioeventfd(vdev
);
1594 error_report("binding does not support host notifiers");
1599 * Batch all the host notifiers in a single transaction to avoid
1600 * quadratic time complexity in address_space_update_ioeventfds().
1602 memory_region_transaction_begin();
1604 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1605 r
= virtio_bus_set_host_notifier(VIRTIO_BUS(qbus
), hdev
->vq_index
+ i
,
1608 error_report("vhost VQ %d notifier binding failed: %d", i
, -r
);
1609 memory_region_transaction_commit();
1610 vhost_dev_disable_notifiers_nvqs(hdev
, vdev
, i
);
1615 memory_region_transaction_commit();
1620 /* Stop processing guest IO notifications in vhost.
1621 * Start processing them in qemu.
1622 * This might actually run the qemu handlers right away,
1623 * so virtio in qemu must be completely setup when this is called.
1625 void vhost_dev_disable_notifiers(struct vhost_dev
*hdev
, VirtIODevice
*vdev
)
1627 vhost_dev_disable_notifiers_nvqs(hdev
, vdev
, hdev
->nvqs
);
1630 /* Test and clear event pending status.
1631 * Should be called after unmask to avoid losing events.
1633 bool vhost_virtqueue_pending(struct vhost_dev
*hdev
, int n
)
1635 struct vhost_virtqueue
*vq
= hdev
->vqs
+ n
- hdev
->vq_index
;
1636 assert(n
>= hdev
->vq_index
&& n
< hdev
->vq_index
+ hdev
->nvqs
);
1637 return event_notifier_test_and_clear(&vq
->masked_notifier
);
1640 /* Mask/unmask events from this vq. */
1641 void vhost_virtqueue_mask(struct vhost_dev
*hdev
, VirtIODevice
*vdev
, int n
,
1644 struct VirtQueue
*vvq
= virtio_get_queue(vdev
, n
);
1645 int r
, index
= n
- hdev
->vq_index
;
1646 struct vhost_vring_file file
;
1648 /* should only be called after backend is connected */
1649 assert(hdev
->vhost_ops
);
1652 assert(vdev
->use_guest_notifier_mask
);
1653 file
.fd
= event_notifier_get_wfd(&hdev
->vqs
[index
].masked_notifier
);
1655 file
.fd
= event_notifier_get_wfd(virtio_queue_get_guest_notifier(vvq
));
1658 file
.index
= hdev
->vhost_ops
->vhost_get_vq_index(hdev
, n
);
1659 r
= hdev
->vhost_ops
->vhost_set_vring_call(hdev
, &file
);
1661 error_report("vhost_set_vring_call failed %d", -r
);
1665 bool vhost_config_pending(struct vhost_dev
*hdev
)
1667 assert(hdev
->vhost_ops
);
1668 if ((hdev
->started
== false) ||
1669 (hdev
->vhost_ops
->vhost_set_config_call
== NULL
)) {
1673 EventNotifier
*notifier
=
1674 &hdev
->vqs
[VHOST_QUEUE_NUM_CONFIG_INR
].masked_config_notifier
;
1675 return event_notifier_test_and_clear(notifier
);
1678 void vhost_config_mask(struct vhost_dev
*hdev
, VirtIODevice
*vdev
, bool mask
)
1682 EventNotifier
*notifier
=
1683 &hdev
->vqs
[VHOST_QUEUE_NUM_CONFIG_INR
].masked_config_notifier
;
1684 EventNotifier
*config_notifier
= &vdev
->config_notifier
;
1685 assert(hdev
->vhost_ops
);
1687 if ((hdev
->started
== false) ||
1688 (hdev
->vhost_ops
->vhost_set_config_call
== NULL
)) {
1692 assert(vdev
->use_guest_notifier_mask
);
1693 fd
= event_notifier_get_fd(notifier
);
1695 fd
= event_notifier_get_fd(config_notifier
);
1697 r
= hdev
->vhost_ops
->vhost_set_config_call(hdev
, fd
);
1699 error_report("vhost_set_config_call failed %d", -r
);
1703 static void vhost_stop_config_intr(struct vhost_dev
*dev
)
1706 assert(dev
->vhost_ops
);
1707 if (dev
->vhost_ops
->vhost_set_config_call
) {
1708 dev
->vhost_ops
->vhost_set_config_call(dev
, fd
);
1712 static void vhost_start_config_intr(struct vhost_dev
*dev
)
1716 assert(dev
->vhost_ops
);
1717 int fd
= event_notifier_get_fd(&dev
->vdev
->config_notifier
);
1718 if (dev
->vhost_ops
->vhost_set_config_call
) {
1719 r
= dev
->vhost_ops
->vhost_set_config_call(dev
, fd
);
1721 event_notifier_set(&dev
->vdev
->config_notifier
);
1726 uint64_t vhost_get_features(struct vhost_dev
*hdev
, const int *feature_bits
,
1729 const int *bit
= feature_bits
;
1730 while (*bit
!= VHOST_INVALID_FEATURE_BIT
) {
1731 uint64_t bit_mask
= (1ULL << *bit
);
1732 if (!(hdev
->features
& bit_mask
)) {
1733 features
&= ~bit_mask
;
1740 void vhost_ack_features(struct vhost_dev
*hdev
, const int *feature_bits
,
1743 const int *bit
= feature_bits
;
1744 while (*bit
!= VHOST_INVALID_FEATURE_BIT
) {
1745 uint64_t bit_mask
= (1ULL << *bit
);
1746 if (features
& bit_mask
) {
1747 hdev
->acked_features
|= bit_mask
;
1753 int vhost_dev_get_config(struct vhost_dev
*hdev
, uint8_t *config
,
1754 uint32_t config_len
, Error
**errp
)
1756 assert(hdev
->vhost_ops
);
1758 if (hdev
->vhost_ops
->vhost_get_config
) {
1759 return hdev
->vhost_ops
->vhost_get_config(hdev
, config
, config_len
,
1763 error_setg(errp
, "vhost_get_config not implemented");
1767 int vhost_dev_set_config(struct vhost_dev
*hdev
, const uint8_t *data
,
1768 uint32_t offset
, uint32_t size
, uint32_t flags
)
1770 assert(hdev
->vhost_ops
);
1772 if (hdev
->vhost_ops
->vhost_set_config
) {
1773 return hdev
->vhost_ops
->vhost_set_config(hdev
, data
, offset
,
1780 void vhost_dev_set_config_notifier(struct vhost_dev
*hdev
,
1781 const VhostDevConfigOps
*ops
)
1783 hdev
->config_ops
= ops
;
1786 void vhost_dev_free_inflight(struct vhost_inflight
*inflight
)
1788 if (inflight
&& inflight
->addr
) {
1789 qemu_memfd_free(inflight
->addr
, inflight
->size
, inflight
->fd
);
1790 inflight
->addr
= NULL
;
1795 static int vhost_dev_resize_inflight(struct vhost_inflight
*inflight
,
1800 void *addr
= qemu_memfd_alloc("vhost-inflight", new_size
,
1801 F_SEAL_GROW
| F_SEAL_SHRINK
| F_SEAL_SEAL
,
1805 error_report_err(err
);
1809 vhost_dev_free_inflight(inflight
);
1810 inflight
->offset
= 0;
1811 inflight
->addr
= addr
;
1813 inflight
->size
= new_size
;
1818 void vhost_dev_save_inflight(struct vhost_inflight
*inflight
, QEMUFile
*f
)
1820 if (inflight
->addr
) {
1821 qemu_put_be64(f
, inflight
->size
);
1822 qemu_put_be16(f
, inflight
->queue_size
);
1823 qemu_put_buffer(f
, inflight
->addr
, inflight
->size
);
1825 qemu_put_be64(f
, 0);
1829 int vhost_dev_load_inflight(struct vhost_inflight
*inflight
, QEMUFile
*f
)
1833 size
= qemu_get_be64(f
);
1838 if (inflight
->size
!= size
) {
1839 int ret
= vhost_dev_resize_inflight(inflight
, size
);
1844 inflight
->queue_size
= qemu_get_be16(f
);
1846 qemu_get_buffer(f
, inflight
->addr
, size
);
1851 int vhost_dev_prepare_inflight(struct vhost_dev
*hdev
, VirtIODevice
*vdev
)
1855 if (hdev
->vhost_ops
->vhost_get_inflight_fd
== NULL
||
1856 hdev
->vhost_ops
->vhost_set_inflight_fd
== NULL
) {
1862 r
= vhost_dev_set_features(hdev
, hdev
->log_enabled
);
1864 VHOST_OPS_DEBUG(r
, "vhost_dev_prepare_inflight failed");
1871 int vhost_dev_set_inflight(struct vhost_dev
*dev
,
1872 struct vhost_inflight
*inflight
)
1876 if (dev
->vhost_ops
->vhost_set_inflight_fd
&& inflight
->addr
) {
1877 r
= dev
->vhost_ops
->vhost_set_inflight_fd(dev
, inflight
);
1879 VHOST_OPS_DEBUG(r
, "vhost_set_inflight_fd failed");
1887 int vhost_dev_get_inflight(struct vhost_dev
*dev
, uint16_t queue_size
,
1888 struct vhost_inflight
*inflight
)
1892 if (dev
->vhost_ops
->vhost_get_inflight_fd
) {
1893 r
= dev
->vhost_ops
->vhost_get_inflight_fd(dev
, queue_size
, inflight
);
1895 VHOST_OPS_DEBUG(r
, "vhost_get_inflight_fd failed");
1903 static int vhost_dev_set_vring_enable(struct vhost_dev
*hdev
, int enable
)
1905 if (!hdev
->vhost_ops
->vhost_set_vring_enable
) {
1910 * For vhost-user devices, if VHOST_USER_F_PROTOCOL_FEATURES has not
1911 * been negotiated, the rings start directly in the enabled state, and
1912 * .vhost_set_vring_enable callback will fail since
1913 * VHOST_USER_SET_VRING_ENABLE is not supported.
1915 if (hdev
->vhost_ops
->backend_type
== VHOST_BACKEND_TYPE_USER
&&
1916 !virtio_has_feature(hdev
->backend_features
,
1917 VHOST_USER_F_PROTOCOL_FEATURES
)) {
1921 return hdev
->vhost_ops
->vhost_set_vring_enable(hdev
, enable
);
1924 /* Host notifiers must be enabled at this point. */
1925 int vhost_dev_start(struct vhost_dev
*hdev
, VirtIODevice
*vdev
, bool vrings
)
1929 /* should only be called after backend is connected */
1930 assert(hdev
->vhost_ops
);
1932 trace_vhost_dev_start(hdev
, vdev
->name
, vrings
);
1934 vdev
->vhost_started
= true;
1935 hdev
->started
= true;
1938 r
= vhost_dev_set_features(hdev
, hdev
->log_enabled
);
1943 if (vhost_dev_has_iommu(hdev
)) {
1944 memory_listener_register(&hdev
->iommu_listener
, vdev
->dma_as
);
1947 r
= hdev
->vhost_ops
->vhost_set_mem_table(hdev
, hdev
->mem
);
1949 VHOST_OPS_DEBUG(r
, "vhost_set_mem_table failed");
1952 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
1953 r
= vhost_virtqueue_start(hdev
,
1956 hdev
->vq_index
+ i
);
1962 r
= event_notifier_init(
1963 &hdev
->vqs
[VHOST_QUEUE_NUM_CONFIG_INR
].masked_config_notifier
, 0);
1965 VHOST_OPS_DEBUG(r
, "event_notifier_init failed");
1968 event_notifier_test_and_clear(
1969 &hdev
->vqs
[VHOST_QUEUE_NUM_CONFIG_INR
].masked_config_notifier
);
1970 if (!vdev
->use_guest_notifier_mask
) {
1971 vhost_config_mask(hdev
, vdev
, true);
1973 if (hdev
->log_enabled
) {
1976 hdev
->log_size
= vhost_get_log_size(hdev
);
1977 hdev
->log
= vhost_log_get(hdev
->log_size
,
1978 vhost_dev_log_is_shared(hdev
));
1979 log_base
= (uintptr_t)hdev
->log
->log
;
1980 r
= hdev
->vhost_ops
->vhost_set_log_base(hdev
,
1981 hdev
->log_size
? log_base
: 0,
1984 VHOST_OPS_DEBUG(r
, "vhost_set_log_base failed");
1989 r
= vhost_dev_set_vring_enable(hdev
, true);
1994 if (hdev
->vhost_ops
->vhost_dev_start
) {
1995 r
= hdev
->vhost_ops
->vhost_dev_start(hdev
, true);
2000 if (vhost_dev_has_iommu(hdev
) &&
2001 hdev
->vhost_ops
->vhost_set_iotlb_callback
) {
2002 hdev
->vhost_ops
->vhost_set_iotlb_callback(hdev
, true);
2004 /* Update used ring information for IOTLB to work correctly,
2005 * vhost-kernel code requires for this.*/
2006 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
2007 struct vhost_virtqueue
*vq
= hdev
->vqs
+ i
;
2008 vhost_device_iotlb_miss(hdev
, vq
->used_phys
, true);
2011 vhost_start_config_intr(hdev
);
2015 vhost_dev_set_vring_enable(hdev
, false);
2018 vhost_log_put(hdev
, false);
2021 vhost_virtqueue_stop(hdev
,
2024 hdev
->vq_index
+ i
);
2028 if (vhost_dev_has_iommu(hdev
)) {
2029 memory_listener_unregister(&hdev
->iommu_listener
);
2032 vdev
->vhost_started
= false;
2033 hdev
->started
= false;
2037 /* Host notifiers must be enabled at this point. */
2038 void vhost_dev_stop(struct vhost_dev
*hdev
, VirtIODevice
*vdev
, bool vrings
)
2042 /* should only be called after backend is connected */
2043 assert(hdev
->vhost_ops
);
2044 event_notifier_test_and_clear(
2045 &hdev
->vqs
[VHOST_QUEUE_NUM_CONFIG_INR
].masked_config_notifier
);
2046 event_notifier_test_and_clear(&vdev
->config_notifier
);
2047 event_notifier_cleanup(
2048 &hdev
->vqs
[VHOST_QUEUE_NUM_CONFIG_INR
].masked_config_notifier
);
2050 trace_vhost_dev_stop(hdev
, vdev
->name
, vrings
);
2052 if (hdev
->vhost_ops
->vhost_dev_start
) {
2053 hdev
->vhost_ops
->vhost_dev_start(hdev
, false);
2056 vhost_dev_set_vring_enable(hdev
, false);
2058 for (i
= 0; i
< hdev
->nvqs
; ++i
) {
2059 vhost_virtqueue_stop(hdev
,
2062 hdev
->vq_index
+ i
);
2064 if (hdev
->vhost_ops
->vhost_reset_status
) {
2065 hdev
->vhost_ops
->vhost_reset_status(hdev
);
2068 if (vhost_dev_has_iommu(hdev
)) {
2069 if (hdev
->vhost_ops
->vhost_set_iotlb_callback
) {
2070 hdev
->vhost_ops
->vhost_set_iotlb_callback(hdev
, false);
2072 memory_listener_unregister(&hdev
->iommu_listener
);
2074 vhost_stop_config_intr(hdev
);
2075 vhost_log_put(hdev
, true);
2076 hdev
->started
= false;
2077 vdev
->vhost_started
= false;
2081 int vhost_net_set_backend(struct vhost_dev
*hdev
,
2082 struct vhost_vring_file
*file
)
2084 if (hdev
->vhost_ops
->vhost_net_set_backend
) {
2085 return hdev
->vhost_ops
->vhost_net_set_backend(hdev
, file
);