4 * Copyright IBM, Corp. 2007
7 * Anthony Liguori <aliguori@us.ibm.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.
14 #include "qemu/osdep.h"
17 #include "exec/address-spaces.h"
18 #include "qemu/error-report.h"
19 #include "hw/virtio/virtio.h"
20 #include "qemu/atomic.h"
21 #include "hw/virtio/virtio-bus.h"
22 #include "migration/migration.h"
23 #include "hw/virtio/virtio-access.h"
26 * The alignment to use between consumer and producer parts of vring.
27 * x86 pagesize again. This is the default, used by transports like PCI
28 * which don't provide a means for the guest to tell the host the alignment.
30 #define VIRTIO_PCI_VRING_ALIGN 4096
32 typedef struct VRingDesc
40 typedef struct VRingAvail
47 typedef struct VRingUsedElem
53 typedef struct VRingUsed
57 VRingUsedElem ring
[0];
63 unsigned int num_default
;
73 uint16_t last_avail_idx
;
74 /* Last used index value we have signalled on */
75 uint16_t signalled_used
;
77 /* Last used index value we have signalled on */
78 bool signalled_used_valid
;
80 /* Notification enabled? */
88 void (*handle_output
)(VirtIODevice
*vdev
, VirtQueue
*vq
);
90 EventNotifier guest_notifier
;
91 EventNotifier host_notifier
;
92 QLIST_ENTRY(VirtQueue
) node
;
95 /* virt queue functions */
96 void virtio_queue_update_rings(VirtIODevice
*vdev
, int n
)
98 VRing
*vring
= &vdev
->vq
[n
].vring
;
101 /* not yet setup -> nothing to do */
104 vring
->avail
= vring
->desc
+ vring
->num
* sizeof(VRingDesc
);
105 vring
->used
= vring_align(vring
->avail
+
106 offsetof(VRingAvail
, ring
[vring
->num
]),
110 static void vring_desc_read(VirtIODevice
*vdev
, VRingDesc
*desc
,
111 hwaddr desc_pa
, int i
)
113 address_space_read(&address_space_memory
, desc_pa
+ i
* sizeof(VRingDesc
),
114 MEMTXATTRS_UNSPECIFIED
, (void *)desc
, sizeof(VRingDesc
));
115 virtio_tswap64s(vdev
, &desc
->addr
);
116 virtio_tswap32s(vdev
, &desc
->len
);
117 virtio_tswap16s(vdev
, &desc
->flags
);
118 virtio_tswap16s(vdev
, &desc
->next
);
121 static inline uint16_t vring_avail_flags(VirtQueue
*vq
)
124 pa
= vq
->vring
.avail
+ offsetof(VRingAvail
, flags
);
125 return virtio_lduw_phys(vq
->vdev
, pa
);
128 static inline uint16_t vring_avail_idx(VirtQueue
*vq
)
131 pa
= vq
->vring
.avail
+ offsetof(VRingAvail
, idx
);
132 return virtio_lduw_phys(vq
->vdev
, pa
);
135 static inline uint16_t vring_avail_ring(VirtQueue
*vq
, int i
)
138 pa
= vq
->vring
.avail
+ offsetof(VRingAvail
, ring
[i
]);
139 return virtio_lduw_phys(vq
->vdev
, pa
);
142 static inline uint16_t vring_get_used_event(VirtQueue
*vq
)
144 return vring_avail_ring(vq
, vq
->vring
.num
);
147 static inline void vring_used_ring_id(VirtQueue
*vq
, int i
, uint32_t val
)
150 pa
= vq
->vring
.used
+ offsetof(VRingUsed
, ring
[i
].id
);
151 virtio_stl_phys(vq
->vdev
, pa
, val
);
154 static inline void vring_used_ring_len(VirtQueue
*vq
, int i
, uint32_t val
)
157 pa
= vq
->vring
.used
+ offsetof(VRingUsed
, ring
[i
].len
);
158 virtio_stl_phys(vq
->vdev
, pa
, val
);
161 static uint16_t vring_used_idx(VirtQueue
*vq
)
164 pa
= vq
->vring
.used
+ offsetof(VRingUsed
, idx
);
165 return virtio_lduw_phys(vq
->vdev
, pa
);
168 static inline void vring_used_idx_set(VirtQueue
*vq
, uint16_t val
)
171 pa
= vq
->vring
.used
+ offsetof(VRingUsed
, idx
);
172 virtio_stw_phys(vq
->vdev
, pa
, val
);
175 static inline void vring_used_flags_set_bit(VirtQueue
*vq
, int mask
)
177 VirtIODevice
*vdev
= vq
->vdev
;
179 pa
= vq
->vring
.used
+ offsetof(VRingUsed
, flags
);
180 virtio_stw_phys(vdev
, pa
, virtio_lduw_phys(vdev
, pa
) | mask
);
183 static inline void vring_used_flags_unset_bit(VirtQueue
*vq
, int mask
)
185 VirtIODevice
*vdev
= vq
->vdev
;
187 pa
= vq
->vring
.used
+ offsetof(VRingUsed
, flags
);
188 virtio_stw_phys(vdev
, pa
, virtio_lduw_phys(vdev
, pa
) & ~mask
);
191 static inline void vring_set_avail_event(VirtQueue
*vq
, uint16_t val
)
194 if (!vq
->notification
) {
197 pa
= vq
->vring
.used
+ offsetof(VRingUsed
, ring
[vq
->vring
.num
]);
198 virtio_stw_phys(vq
->vdev
, pa
, val
);
201 void virtio_queue_set_notification(VirtQueue
*vq
, int enable
)
203 vq
->notification
= enable
;
204 if (virtio_vdev_has_feature(vq
->vdev
, VIRTIO_RING_F_EVENT_IDX
)) {
205 vring_set_avail_event(vq
, vring_avail_idx(vq
));
207 vring_used_flags_unset_bit(vq
, VRING_USED_F_NO_NOTIFY
);
209 vring_used_flags_set_bit(vq
, VRING_USED_F_NO_NOTIFY
);
212 /* Expose avail event/used flags before caller checks the avail idx. */
217 int virtio_queue_ready(VirtQueue
*vq
)
219 return vq
->vring
.avail
!= 0;
222 int virtio_queue_empty(VirtQueue
*vq
)
224 return vring_avail_idx(vq
) == vq
->last_avail_idx
;
227 static void virtqueue_unmap_sg(VirtQueue
*vq
, const VirtQueueElement
*elem
,
234 for (i
= 0; i
< elem
->in_num
; i
++) {
235 size_t size
= MIN(len
- offset
, elem
->in_sg
[i
].iov_len
);
237 cpu_physical_memory_unmap(elem
->in_sg
[i
].iov_base
,
238 elem
->in_sg
[i
].iov_len
,
244 for (i
= 0; i
< elem
->out_num
; i
++)
245 cpu_physical_memory_unmap(elem
->out_sg
[i
].iov_base
,
246 elem
->out_sg
[i
].iov_len
,
247 0, elem
->out_sg
[i
].iov_len
);
250 void virtqueue_discard(VirtQueue
*vq
, const VirtQueueElement
*elem
,
253 vq
->last_avail_idx
--;
254 virtqueue_unmap_sg(vq
, elem
, len
);
257 void virtqueue_fill(VirtQueue
*vq
, const VirtQueueElement
*elem
,
258 unsigned int len
, unsigned int idx
)
260 trace_virtqueue_fill(vq
, elem
, len
, idx
);
262 virtqueue_unmap_sg(vq
, elem
, len
);
264 idx
= (idx
+ vring_used_idx(vq
)) % vq
->vring
.num
;
266 /* Get a pointer to the next entry in the used ring. */
267 vring_used_ring_id(vq
, idx
, elem
->index
);
268 vring_used_ring_len(vq
, idx
, len
);
271 void virtqueue_flush(VirtQueue
*vq
, unsigned int count
)
274 /* Make sure buffer is written before we update index. */
276 trace_virtqueue_flush(vq
, count
);
277 old
= vring_used_idx(vq
);
279 vring_used_idx_set(vq
, new);
281 if (unlikely((int16_t)(new - vq
->signalled_used
) < (uint16_t)(new - old
)))
282 vq
->signalled_used_valid
= false;
285 void virtqueue_push(VirtQueue
*vq
, const VirtQueueElement
*elem
,
288 virtqueue_fill(vq
, elem
, len
, 0);
289 virtqueue_flush(vq
, 1);
292 static int virtqueue_num_heads(VirtQueue
*vq
, unsigned int idx
)
294 uint16_t num_heads
= vring_avail_idx(vq
) - idx
;
296 /* Check it isn't doing very strange things with descriptor numbers. */
297 if (num_heads
> vq
->vring
.num
) {
298 error_report("Guest moved used index from %u to %u",
299 idx
, vring_avail_idx(vq
));
302 /* On success, callers read a descriptor at vq->last_avail_idx.
303 * Make sure descriptor read does not bypass avail index read. */
311 static unsigned int virtqueue_get_head(VirtQueue
*vq
, unsigned int idx
)
315 /* Grab the next descriptor number they're advertising, and increment
316 * the index we've seen. */
317 head
= vring_avail_ring(vq
, idx
% vq
->vring
.num
);
319 /* If their number is silly, that's a fatal mistake. */
320 if (head
>= vq
->vring
.num
) {
321 error_report("Guest says index %u is available", head
);
328 static unsigned virtqueue_read_next_desc(VirtIODevice
*vdev
, VRingDesc
*desc
,
329 hwaddr desc_pa
, unsigned int max
)
333 /* If this descriptor says it doesn't chain, we're done. */
334 if (!(desc
->flags
& VRING_DESC_F_NEXT
)) {
338 /* Check they're not leading us off end of descriptors. */
340 /* Make sure compiler knows to grab that: we don't want it changing! */
344 error_report("Desc next is %u", next
);
348 vring_desc_read(vdev
, desc
, desc_pa
, next
);
352 void virtqueue_get_avail_bytes(VirtQueue
*vq
, unsigned int *in_bytes
,
353 unsigned int *out_bytes
,
354 unsigned max_in_bytes
, unsigned max_out_bytes
)
357 unsigned int total_bufs
, in_total
, out_total
;
359 idx
= vq
->last_avail_idx
;
361 total_bufs
= in_total
= out_total
= 0;
362 while (virtqueue_num_heads(vq
, idx
)) {
363 VirtIODevice
*vdev
= vq
->vdev
;
364 unsigned int max
, num_bufs
, indirect
= 0;
370 num_bufs
= total_bufs
;
371 i
= virtqueue_get_head(vq
, idx
++);
372 desc_pa
= vq
->vring
.desc
;
373 vring_desc_read(vdev
, &desc
, desc_pa
, i
);
375 if (desc
.flags
& VRING_DESC_F_INDIRECT
) {
376 if (desc
.len
% sizeof(VRingDesc
)) {
377 error_report("Invalid size for indirect buffer table");
381 /* If we've got too many, that implies a descriptor loop. */
382 if (num_bufs
>= max
) {
383 error_report("Looped descriptor");
387 /* loop over the indirect descriptor table */
389 max
= desc
.len
/ sizeof(VRingDesc
);
392 vring_desc_read(vdev
, &desc
, desc_pa
, i
);
396 /* If we've got too many, that implies a descriptor loop. */
397 if (++num_bufs
> max
) {
398 error_report("Looped descriptor");
402 if (desc
.flags
& VRING_DESC_F_WRITE
) {
403 in_total
+= desc
.len
;
405 out_total
+= desc
.len
;
407 if (in_total
>= max_in_bytes
&& out_total
>= max_out_bytes
) {
410 } while ((i
= virtqueue_read_next_desc(vdev
, &desc
, desc_pa
, max
)) != max
);
413 total_bufs
= num_bufs
;
419 *in_bytes
= in_total
;
422 *out_bytes
= out_total
;
426 int virtqueue_avail_bytes(VirtQueue
*vq
, unsigned int in_bytes
,
427 unsigned int out_bytes
)
429 unsigned int in_total
, out_total
;
431 virtqueue_get_avail_bytes(vq
, &in_total
, &out_total
, in_bytes
, out_bytes
);
432 return in_bytes
<= in_total
&& out_bytes
<= out_total
;
435 static void virtqueue_map_desc(unsigned int *p_num_sg
, hwaddr
*addr
, struct iovec
*iov
,
436 unsigned int max_num_sg
, bool is_write
,
437 hwaddr pa
, size_t sz
)
439 unsigned num_sg
= *p_num_sg
;
440 assert(num_sg
<= max_num_sg
);
445 if (num_sg
== max_num_sg
) {
446 error_report("virtio: too many write descriptors in indirect table");
450 iov
[num_sg
].iov_base
= cpu_physical_memory_map(pa
, &len
, is_write
);
451 iov
[num_sg
].iov_len
= len
;
461 static void virtqueue_map_iovec(struct iovec
*sg
, hwaddr
*addr
,
462 unsigned int *num_sg
, unsigned int max_size
,
468 /* Note: this function MUST validate input, some callers
469 * are passing in num_sg values received over the network.
471 /* TODO: teach all callers that this can fail, and return failure instead
473 * When we do, we might be able to re-enable NDEBUG below.
476 #error building with NDEBUG is not supported
478 assert(*num_sg
<= max_size
);
480 for (i
= 0; i
< *num_sg
; i
++) {
482 sg
[i
].iov_base
= cpu_physical_memory_map(addr
[i
], &len
, is_write
);
483 if (!sg
[i
].iov_base
) {
484 error_report("virtio: error trying to map MMIO memory");
487 if (len
!= sg
[i
].iov_len
) {
488 error_report("virtio: unexpected memory split");
494 void virtqueue_map(VirtQueueElement
*elem
)
496 virtqueue_map_iovec(elem
->in_sg
, elem
->in_addr
, &elem
->in_num
,
497 VIRTQUEUE_MAX_SIZE
, 1);
498 virtqueue_map_iovec(elem
->out_sg
, elem
->out_addr
, &elem
->out_num
,
499 VIRTQUEUE_MAX_SIZE
, 0);
502 void *virtqueue_alloc_element(size_t sz
, unsigned out_num
, unsigned in_num
)
504 VirtQueueElement
*elem
;
505 size_t in_addr_ofs
= QEMU_ALIGN_UP(sz
, __alignof__(elem
->in_addr
[0]));
506 size_t out_addr_ofs
= in_addr_ofs
+ in_num
* sizeof(elem
->in_addr
[0]);
507 size_t out_addr_end
= out_addr_ofs
+ out_num
* sizeof(elem
->out_addr
[0]);
508 size_t in_sg_ofs
= QEMU_ALIGN_UP(out_addr_end
, __alignof__(elem
->in_sg
[0]));
509 size_t out_sg_ofs
= in_sg_ofs
+ in_num
* sizeof(elem
->in_sg
[0]);
510 size_t out_sg_end
= out_sg_ofs
+ out_num
* sizeof(elem
->out_sg
[0]);
512 assert(sz
>= sizeof(VirtQueueElement
));
513 elem
= g_malloc(out_sg_end
);
514 elem
->out_num
= out_num
;
515 elem
->in_num
= in_num
;
516 elem
->in_addr
= (void *)elem
+ in_addr_ofs
;
517 elem
->out_addr
= (void *)elem
+ out_addr_ofs
;
518 elem
->in_sg
= (void *)elem
+ in_sg_ofs
;
519 elem
->out_sg
= (void *)elem
+ out_sg_ofs
;
523 void *virtqueue_pop(VirtQueue
*vq
, size_t sz
)
525 unsigned int i
, head
, max
;
526 hwaddr desc_pa
= vq
->vring
.desc
;
527 VirtIODevice
*vdev
= vq
->vdev
;
528 VirtQueueElement
*elem
;
529 unsigned out_num
, in_num
;
530 hwaddr addr
[VIRTQUEUE_MAX_SIZE
];
531 struct iovec iov
[VIRTQUEUE_MAX_SIZE
];
534 if (!virtqueue_num_heads(vq
, vq
->last_avail_idx
)) {
538 /* When we start there are none of either input nor output. */
539 out_num
= in_num
= 0;
543 i
= head
= virtqueue_get_head(vq
, vq
->last_avail_idx
++);
544 if (virtio_vdev_has_feature(vdev
, VIRTIO_RING_F_EVENT_IDX
)) {
545 vring_set_avail_event(vq
, vq
->last_avail_idx
);
548 vring_desc_read(vdev
, &desc
, desc_pa
, i
);
549 if (desc
.flags
& VRING_DESC_F_INDIRECT
) {
550 if (desc
.len
% sizeof(VRingDesc
)) {
551 error_report("Invalid size for indirect buffer table");
555 /* loop over the indirect descriptor table */
556 max
= desc
.len
/ sizeof(VRingDesc
);
559 vring_desc_read(vdev
, &desc
, desc_pa
, i
);
562 /* Collect all the descriptors */
564 if (desc
.flags
& VRING_DESC_F_WRITE
) {
565 virtqueue_map_desc(&in_num
, addr
+ out_num
, iov
+ out_num
,
566 VIRTQUEUE_MAX_SIZE
- out_num
, true, desc
.addr
, desc
.len
);
569 error_report("Incorrect order for descriptors");
572 virtqueue_map_desc(&out_num
, addr
, iov
,
573 VIRTQUEUE_MAX_SIZE
, false, desc
.addr
, desc
.len
);
576 /* If we've got too many, that implies a descriptor loop. */
577 if ((in_num
+ out_num
) > max
) {
578 error_report("Looped descriptor");
581 } while ((i
= virtqueue_read_next_desc(vdev
, &desc
, desc_pa
, max
)) != max
);
583 /* Now copy what we have collected and mapped */
584 elem
= virtqueue_alloc_element(sz
, out_num
, in_num
);
586 for (i
= 0; i
< out_num
; i
++) {
587 elem
->out_addr
[i
] = addr
[i
];
588 elem
->out_sg
[i
] = iov
[i
];
590 for (i
= 0; i
< in_num
; i
++) {
591 elem
->in_addr
[i
] = addr
[out_num
+ i
];
592 elem
->in_sg
[i
] = iov
[out_num
+ i
];
597 trace_virtqueue_pop(vq
, elem
, elem
->in_num
, elem
->out_num
);
601 /* Reading and writing a structure directly to QEMUFile is *awful*, but
602 * it is what QEMU has always done by mistake. We can change it sooner
603 * or later by bumping the version number of the affected vm states.
604 * In the meanwhile, since the in-memory layout of VirtQueueElement
605 * has changed, we need to marshal to and from the layout that was
606 * used before the change.
608 typedef struct VirtQueueElementOld
{
610 unsigned int out_num
;
612 hwaddr in_addr
[VIRTQUEUE_MAX_SIZE
];
613 hwaddr out_addr
[VIRTQUEUE_MAX_SIZE
];
614 struct iovec in_sg
[VIRTQUEUE_MAX_SIZE
];
615 struct iovec out_sg
[VIRTQUEUE_MAX_SIZE
];
616 } VirtQueueElementOld
;
618 void *qemu_get_virtqueue_element(QEMUFile
*f
, size_t sz
)
620 VirtQueueElement
*elem
;
621 VirtQueueElementOld data
;
624 qemu_get_buffer(f
, (uint8_t *)&data
, sizeof(VirtQueueElementOld
));
626 elem
= virtqueue_alloc_element(sz
, data
.out_num
, data
.in_num
);
627 elem
->index
= data
.index
;
629 for (i
= 0; i
< elem
->in_num
; i
++) {
630 elem
->in_addr
[i
] = data
.in_addr
[i
];
633 for (i
= 0; i
< elem
->out_num
; i
++) {
634 elem
->out_addr
[i
] = data
.out_addr
[i
];
637 for (i
= 0; i
< elem
->in_num
; i
++) {
638 /* Base is overwritten by virtqueue_map. */
639 elem
->in_sg
[i
].iov_base
= 0;
640 elem
->in_sg
[i
].iov_len
= data
.in_sg
[i
].iov_len
;
643 for (i
= 0; i
< elem
->out_num
; i
++) {
644 /* Base is overwritten by virtqueue_map. */
645 elem
->out_sg
[i
].iov_base
= 0;
646 elem
->out_sg
[i
].iov_len
= data
.out_sg
[i
].iov_len
;
653 void qemu_put_virtqueue_element(QEMUFile
*f
, VirtQueueElement
*elem
)
655 VirtQueueElementOld data
;
658 memset(&data
, 0, sizeof(data
));
659 data
.index
= elem
->index
;
660 data
.in_num
= elem
->in_num
;
661 data
.out_num
= elem
->out_num
;
663 for (i
= 0; i
< elem
->in_num
; i
++) {
664 data
.in_addr
[i
] = elem
->in_addr
[i
];
667 for (i
= 0; i
< elem
->out_num
; i
++) {
668 data
.out_addr
[i
] = elem
->out_addr
[i
];
671 for (i
= 0; i
< elem
->in_num
; i
++) {
672 /* Base is overwritten by virtqueue_map when loading. Do not
673 * save it, as it would leak the QEMU address space layout. */
674 data
.in_sg
[i
].iov_len
= elem
->in_sg
[i
].iov_len
;
677 for (i
= 0; i
< elem
->out_num
; i
++) {
678 /* Do not save iov_base as above. */
679 data
.out_sg
[i
].iov_len
= elem
->out_sg
[i
].iov_len
;
681 qemu_put_buffer(f
, (uint8_t *)&data
, sizeof(VirtQueueElementOld
));
685 static void virtio_notify_vector(VirtIODevice
*vdev
, uint16_t vector
)
687 BusState
*qbus
= qdev_get_parent_bus(DEVICE(vdev
));
688 VirtioBusClass
*k
= VIRTIO_BUS_GET_CLASS(qbus
);
691 k
->notify(qbus
->parent
, vector
);
695 void virtio_update_irq(VirtIODevice
*vdev
)
697 virtio_notify_vector(vdev
, VIRTIO_NO_VECTOR
);
700 static int virtio_validate_features(VirtIODevice
*vdev
)
702 VirtioDeviceClass
*k
= VIRTIO_DEVICE_GET_CLASS(vdev
);
704 if (k
->validate_features
) {
705 return k
->validate_features(vdev
);
711 int virtio_set_status(VirtIODevice
*vdev
, uint8_t val
)
713 VirtioDeviceClass
*k
= VIRTIO_DEVICE_GET_CLASS(vdev
);
714 trace_virtio_set_status(vdev
, val
);
716 if (virtio_vdev_has_feature(vdev
, VIRTIO_F_VERSION_1
)) {
717 if (!(vdev
->status
& VIRTIO_CONFIG_S_FEATURES_OK
) &&
718 val
& VIRTIO_CONFIG_S_FEATURES_OK
) {
719 int ret
= virtio_validate_features(vdev
);
727 k
->set_status(vdev
, val
);
733 bool target_words_bigendian(void);
734 static enum virtio_device_endian
virtio_default_endian(void)
736 if (target_words_bigendian()) {
737 return VIRTIO_DEVICE_ENDIAN_BIG
;
739 return VIRTIO_DEVICE_ENDIAN_LITTLE
;
743 static enum virtio_device_endian
virtio_current_cpu_endian(void)
745 CPUClass
*cc
= CPU_GET_CLASS(current_cpu
);
747 if (cc
->virtio_is_big_endian(current_cpu
)) {
748 return VIRTIO_DEVICE_ENDIAN_BIG
;
750 return VIRTIO_DEVICE_ENDIAN_LITTLE
;
754 void virtio_reset(void *opaque
)
756 VirtIODevice
*vdev
= opaque
;
757 VirtioDeviceClass
*k
= VIRTIO_DEVICE_GET_CLASS(vdev
);
760 virtio_set_status(vdev
, 0);
762 /* Guest initiated reset */
763 vdev
->device_endian
= virtio_current_cpu_endian();
766 vdev
->device_endian
= virtio_default_endian();
773 vdev
->guest_features
= 0;
777 vdev
->config_vector
= VIRTIO_NO_VECTOR
;
778 virtio_notify_vector(vdev
, vdev
->config_vector
);
780 for(i
= 0; i
< VIRTIO_QUEUE_MAX
; i
++) {
781 vdev
->vq
[i
].vring
.desc
= 0;
782 vdev
->vq
[i
].vring
.avail
= 0;
783 vdev
->vq
[i
].vring
.used
= 0;
784 vdev
->vq
[i
].last_avail_idx
= 0;
785 virtio_queue_set_vector(vdev
, i
, VIRTIO_NO_VECTOR
);
786 vdev
->vq
[i
].signalled_used
= 0;
787 vdev
->vq
[i
].signalled_used_valid
= false;
788 vdev
->vq
[i
].notification
= true;
789 vdev
->vq
[i
].vring
.num
= vdev
->vq
[i
].vring
.num_default
;
793 uint32_t virtio_config_readb(VirtIODevice
*vdev
, uint32_t addr
)
795 VirtioDeviceClass
*k
= VIRTIO_DEVICE_GET_CLASS(vdev
);
798 if (addr
+ sizeof(val
) > vdev
->config_len
) {
802 k
->get_config(vdev
, vdev
->config
);
804 val
= ldub_p(vdev
->config
+ addr
);
808 uint32_t virtio_config_readw(VirtIODevice
*vdev
, uint32_t addr
)
810 VirtioDeviceClass
*k
= VIRTIO_DEVICE_GET_CLASS(vdev
);
813 if (addr
+ sizeof(val
) > vdev
->config_len
) {
817 k
->get_config(vdev
, vdev
->config
);
819 val
= lduw_p(vdev
->config
+ addr
);
823 uint32_t virtio_config_readl(VirtIODevice
*vdev
, uint32_t addr
)
825 VirtioDeviceClass
*k
= VIRTIO_DEVICE_GET_CLASS(vdev
);
828 if (addr
+ sizeof(val
) > vdev
->config_len
) {
832 k
->get_config(vdev
, vdev
->config
);
834 val
= ldl_p(vdev
->config
+ addr
);
838 void virtio_config_writeb(VirtIODevice
*vdev
, uint32_t addr
, uint32_t data
)
840 VirtioDeviceClass
*k
= VIRTIO_DEVICE_GET_CLASS(vdev
);
843 if (addr
+ sizeof(val
) > vdev
->config_len
) {
847 stb_p(vdev
->config
+ addr
, val
);
850 k
->set_config(vdev
, vdev
->config
);
854 void virtio_config_writew(VirtIODevice
*vdev
, uint32_t addr
, uint32_t data
)
856 VirtioDeviceClass
*k
= VIRTIO_DEVICE_GET_CLASS(vdev
);
859 if (addr
+ sizeof(val
) > vdev
->config_len
) {
863 stw_p(vdev
->config
+ addr
, val
);
866 k
->set_config(vdev
, vdev
->config
);
870 void virtio_config_writel(VirtIODevice
*vdev
, uint32_t addr
, uint32_t data
)
872 VirtioDeviceClass
*k
= VIRTIO_DEVICE_GET_CLASS(vdev
);
875 if (addr
+ sizeof(val
) > vdev
->config_len
) {
879 stl_p(vdev
->config
+ addr
, val
);
882 k
->set_config(vdev
, vdev
->config
);
886 uint32_t virtio_config_modern_readb(VirtIODevice
*vdev
, uint32_t addr
)
888 VirtioDeviceClass
*k
= VIRTIO_DEVICE_GET_CLASS(vdev
);
891 if (addr
+ sizeof(val
) > vdev
->config_len
) {
895 k
->get_config(vdev
, vdev
->config
);
897 val
= ldub_p(vdev
->config
+ addr
);
901 uint32_t virtio_config_modern_readw(VirtIODevice
*vdev
, uint32_t addr
)
903 VirtioDeviceClass
*k
= VIRTIO_DEVICE_GET_CLASS(vdev
);
906 if (addr
+ sizeof(val
) > vdev
->config_len
) {
910 k
->get_config(vdev
, vdev
->config
);
912 val
= lduw_le_p(vdev
->config
+ addr
);
916 uint32_t virtio_config_modern_readl(VirtIODevice
*vdev
, uint32_t addr
)
918 VirtioDeviceClass
*k
= VIRTIO_DEVICE_GET_CLASS(vdev
);
921 if (addr
+ sizeof(val
) > vdev
->config_len
) {
925 k
->get_config(vdev
, vdev
->config
);
927 val
= ldl_le_p(vdev
->config
+ addr
);
931 void virtio_config_modern_writeb(VirtIODevice
*vdev
,
932 uint32_t addr
, uint32_t data
)
934 VirtioDeviceClass
*k
= VIRTIO_DEVICE_GET_CLASS(vdev
);
937 if (addr
+ sizeof(val
) > vdev
->config_len
) {
941 stb_p(vdev
->config
+ addr
, val
);
944 k
->set_config(vdev
, vdev
->config
);
948 void virtio_config_modern_writew(VirtIODevice
*vdev
,
949 uint32_t addr
, uint32_t data
)
951 VirtioDeviceClass
*k
= VIRTIO_DEVICE_GET_CLASS(vdev
);
954 if (addr
+ sizeof(val
) > vdev
->config_len
) {
958 stw_le_p(vdev
->config
+ addr
, val
);
961 k
->set_config(vdev
, vdev
->config
);
965 void virtio_config_modern_writel(VirtIODevice
*vdev
,
966 uint32_t addr
, uint32_t data
)
968 VirtioDeviceClass
*k
= VIRTIO_DEVICE_GET_CLASS(vdev
);
971 if (addr
+ sizeof(val
) > vdev
->config_len
) {
975 stl_le_p(vdev
->config
+ addr
, val
);
978 k
->set_config(vdev
, vdev
->config
);
982 void virtio_queue_set_addr(VirtIODevice
*vdev
, int n
, hwaddr addr
)
984 vdev
->vq
[n
].vring
.desc
= addr
;
985 virtio_queue_update_rings(vdev
, n
);
988 hwaddr
virtio_queue_get_addr(VirtIODevice
*vdev
, int n
)
990 return vdev
->vq
[n
].vring
.desc
;
993 void virtio_queue_set_rings(VirtIODevice
*vdev
, int n
, hwaddr desc
,
994 hwaddr avail
, hwaddr used
)
996 vdev
->vq
[n
].vring
.desc
= desc
;
997 vdev
->vq
[n
].vring
.avail
= avail
;
998 vdev
->vq
[n
].vring
.used
= used
;
1001 void virtio_queue_set_num(VirtIODevice
*vdev
, int n
, int num
)
1003 /* Don't allow guest to flip queue between existent and
1004 * nonexistent states, or to set it to an invalid size.
1006 if (!!num
!= !!vdev
->vq
[n
].vring
.num
||
1007 num
> VIRTQUEUE_MAX_SIZE
||
1011 vdev
->vq
[n
].vring
.num
= num
;
1014 VirtQueue
*virtio_vector_first_queue(VirtIODevice
*vdev
, uint16_t vector
)
1016 return QLIST_FIRST(&vdev
->vector_queues
[vector
]);
1019 VirtQueue
*virtio_vector_next_queue(VirtQueue
*vq
)
1021 return QLIST_NEXT(vq
, node
);
1024 int virtio_queue_get_num(VirtIODevice
*vdev
, int n
)
1026 return vdev
->vq
[n
].vring
.num
;
1029 int virtio_get_num_queues(VirtIODevice
*vdev
)
1033 for (i
= 0; i
< VIRTIO_QUEUE_MAX
; i
++) {
1034 if (!virtio_queue_get_num(vdev
, i
)) {
1042 int virtio_queue_get_id(VirtQueue
*vq
)
1044 VirtIODevice
*vdev
= vq
->vdev
;
1045 assert(vq
>= &vdev
->vq
[0] && vq
< &vdev
->vq
[VIRTIO_QUEUE_MAX
]);
1046 return vq
- &vdev
->vq
[0];
1049 void virtio_queue_set_align(VirtIODevice
*vdev
, int n
, int align
)
1051 BusState
*qbus
= qdev_get_parent_bus(DEVICE(vdev
));
1052 VirtioBusClass
*k
= VIRTIO_BUS_GET_CLASS(qbus
);
1054 /* virtio-1 compliant devices cannot change the alignment */
1055 if (virtio_vdev_has_feature(vdev
, VIRTIO_F_VERSION_1
)) {
1056 error_report("tried to modify queue alignment for virtio-1 device");
1059 /* Check that the transport told us it was going to do this
1060 * (so a buggy transport will immediately assert rather than
1061 * silently failing to migrate this state)
1063 assert(k
->has_variable_vring_alignment
);
1065 vdev
->vq
[n
].vring
.align
= align
;
1066 virtio_queue_update_rings(vdev
, n
);
1069 void virtio_queue_notify_vq(VirtQueue
*vq
)
1071 if (vq
->vring
.desc
&& vq
->handle_output
) {
1072 VirtIODevice
*vdev
= vq
->vdev
;
1074 trace_virtio_queue_notify(vdev
, vq
- vdev
->vq
, vq
);
1075 vq
->handle_output(vdev
, vq
);
1079 void virtio_queue_notify(VirtIODevice
*vdev
, int n
)
1081 virtio_queue_notify_vq(&vdev
->vq
[n
]);
1084 uint16_t virtio_queue_vector(VirtIODevice
*vdev
, int n
)
1086 return n
< VIRTIO_QUEUE_MAX
? vdev
->vq
[n
].vector
:
1090 void virtio_queue_set_vector(VirtIODevice
*vdev
, int n
, uint16_t vector
)
1092 VirtQueue
*vq
= &vdev
->vq
[n
];
1094 if (n
< VIRTIO_QUEUE_MAX
) {
1095 if (vdev
->vector_queues
&&
1096 vdev
->vq
[n
].vector
!= VIRTIO_NO_VECTOR
) {
1097 QLIST_REMOVE(vq
, node
);
1099 vdev
->vq
[n
].vector
= vector
;
1100 if (vdev
->vector_queues
&&
1101 vector
!= VIRTIO_NO_VECTOR
) {
1102 QLIST_INSERT_HEAD(&vdev
->vector_queues
[vector
], vq
, node
);
1107 VirtQueue
*virtio_add_queue(VirtIODevice
*vdev
, int queue_size
,
1108 void (*handle_output
)(VirtIODevice
*, VirtQueue
*))
1112 for (i
= 0; i
< VIRTIO_QUEUE_MAX
; i
++) {
1113 if (vdev
->vq
[i
].vring
.num
== 0)
1117 if (i
== VIRTIO_QUEUE_MAX
|| queue_size
> VIRTQUEUE_MAX_SIZE
)
1120 vdev
->vq
[i
].vring
.num
= queue_size
;
1121 vdev
->vq
[i
].vring
.num_default
= queue_size
;
1122 vdev
->vq
[i
].vring
.align
= VIRTIO_PCI_VRING_ALIGN
;
1123 vdev
->vq
[i
].handle_output
= handle_output
;
1125 return &vdev
->vq
[i
];
1128 void virtio_del_queue(VirtIODevice
*vdev
, int n
)
1130 if (n
< 0 || n
>= VIRTIO_QUEUE_MAX
) {
1134 vdev
->vq
[n
].vring
.num
= 0;
1135 vdev
->vq
[n
].vring
.num_default
= 0;
1138 void virtio_irq(VirtQueue
*vq
)
1140 trace_virtio_irq(vq
);
1141 vq
->vdev
->isr
|= 0x01;
1142 virtio_notify_vector(vq
->vdev
, vq
->vector
);
1145 static bool vring_notify(VirtIODevice
*vdev
, VirtQueue
*vq
)
1149 /* We need to expose used array entries before checking used event. */
1151 /* Always notify when queue is empty (when feature acknowledge) */
1152 if (virtio_vdev_has_feature(vdev
, VIRTIO_F_NOTIFY_ON_EMPTY
) &&
1153 !vq
->inuse
&& vring_avail_idx(vq
) == vq
->last_avail_idx
) {
1157 if (!virtio_vdev_has_feature(vdev
, VIRTIO_RING_F_EVENT_IDX
)) {
1158 return !(vring_avail_flags(vq
) & VRING_AVAIL_F_NO_INTERRUPT
);
1161 v
= vq
->signalled_used_valid
;
1162 vq
->signalled_used_valid
= true;
1163 old
= vq
->signalled_used
;
1164 new = vq
->signalled_used
= vring_used_idx(vq
);
1165 return !v
|| vring_need_event(vring_get_used_event(vq
), new, old
);
1168 void virtio_notify(VirtIODevice
*vdev
, VirtQueue
*vq
)
1170 if (!vring_notify(vdev
, vq
)) {
1174 trace_virtio_notify(vdev
, vq
);
1176 virtio_notify_vector(vdev
, vq
->vector
);
1179 void virtio_notify_config(VirtIODevice
*vdev
)
1181 if (!(vdev
->status
& VIRTIO_CONFIG_S_DRIVER_OK
))
1186 virtio_notify_vector(vdev
, vdev
->config_vector
);
1189 static bool virtio_device_endian_needed(void *opaque
)
1191 VirtIODevice
*vdev
= opaque
;
1193 assert(vdev
->device_endian
!= VIRTIO_DEVICE_ENDIAN_UNKNOWN
);
1194 if (!virtio_vdev_has_feature(vdev
, VIRTIO_F_VERSION_1
)) {
1195 return vdev
->device_endian
!= virtio_default_endian();
1197 /* Devices conforming to VIRTIO 1.0 or later are always LE. */
1198 return vdev
->device_endian
!= VIRTIO_DEVICE_ENDIAN_LITTLE
;
1201 static bool virtio_64bit_features_needed(void *opaque
)
1203 VirtIODevice
*vdev
= opaque
;
1205 return (vdev
->host_features
>> 32) != 0;
1208 static bool virtio_virtqueue_needed(void *opaque
)
1210 VirtIODevice
*vdev
= opaque
;
1212 return virtio_host_has_feature(vdev
, VIRTIO_F_VERSION_1
);
1215 static bool virtio_ringsize_needed(void *opaque
)
1217 VirtIODevice
*vdev
= opaque
;
1220 for (i
= 0; i
< VIRTIO_QUEUE_MAX
; i
++) {
1221 if (vdev
->vq
[i
].vring
.num
!= vdev
->vq
[i
].vring
.num_default
) {
1228 static bool virtio_extra_state_needed(void *opaque
)
1230 VirtIODevice
*vdev
= opaque
;
1231 BusState
*qbus
= qdev_get_parent_bus(DEVICE(vdev
));
1232 VirtioBusClass
*k
= VIRTIO_BUS_GET_CLASS(qbus
);
1234 return k
->has_extra_state
&&
1235 k
->has_extra_state(qbus
->parent
);
1238 static const VMStateDescription vmstate_virtqueue
= {
1239 .name
= "virtqueue_state",
1241 .minimum_version_id
= 1,
1242 .fields
= (VMStateField
[]) {
1243 VMSTATE_UINT64(vring
.avail
, struct VirtQueue
),
1244 VMSTATE_UINT64(vring
.used
, struct VirtQueue
),
1245 VMSTATE_END_OF_LIST()
1249 static const VMStateDescription vmstate_virtio_virtqueues
= {
1250 .name
= "virtio/virtqueues",
1252 .minimum_version_id
= 1,
1253 .needed
= &virtio_virtqueue_needed
,
1254 .fields
= (VMStateField
[]) {
1255 VMSTATE_STRUCT_VARRAY_POINTER_KNOWN(vq
, struct VirtIODevice
,
1256 VIRTIO_QUEUE_MAX
, 0, vmstate_virtqueue
, VirtQueue
),
1257 VMSTATE_END_OF_LIST()
1261 static const VMStateDescription vmstate_ringsize
= {
1262 .name
= "ringsize_state",
1264 .minimum_version_id
= 1,
1265 .fields
= (VMStateField
[]) {
1266 VMSTATE_UINT32(vring
.num_default
, struct VirtQueue
),
1267 VMSTATE_END_OF_LIST()
1271 static const VMStateDescription vmstate_virtio_ringsize
= {
1272 .name
= "virtio/ringsize",
1274 .minimum_version_id
= 1,
1275 .needed
= &virtio_ringsize_needed
,
1276 .fields
= (VMStateField
[]) {
1277 VMSTATE_STRUCT_VARRAY_POINTER_KNOWN(vq
, struct VirtIODevice
,
1278 VIRTIO_QUEUE_MAX
, 0, vmstate_ringsize
, VirtQueue
),
1279 VMSTATE_END_OF_LIST()
1283 static int get_extra_state(QEMUFile
*f
, void *pv
, size_t size
)
1285 VirtIODevice
*vdev
= pv
;
1286 BusState
*qbus
= qdev_get_parent_bus(DEVICE(vdev
));
1287 VirtioBusClass
*k
= VIRTIO_BUS_GET_CLASS(qbus
);
1289 if (!k
->load_extra_state
) {
1292 return k
->load_extra_state(qbus
->parent
, f
);
1296 static void put_extra_state(QEMUFile
*f
, void *pv
, size_t size
)
1298 VirtIODevice
*vdev
= pv
;
1299 BusState
*qbus
= qdev_get_parent_bus(DEVICE(vdev
));
1300 VirtioBusClass
*k
= VIRTIO_BUS_GET_CLASS(qbus
);
1302 k
->save_extra_state(qbus
->parent
, f
);
1305 static const VMStateInfo vmstate_info_extra_state
= {
1306 .name
= "virtqueue_extra_state",
1307 .get
= get_extra_state
,
1308 .put
= put_extra_state
,
1311 static const VMStateDescription vmstate_virtio_extra_state
= {
1312 .name
= "virtio/extra_state",
1314 .minimum_version_id
= 1,
1315 .needed
= &virtio_extra_state_needed
,
1316 .fields
= (VMStateField
[]) {
1318 .name
= "extra_state",
1320 .field_exists
= NULL
,
1322 .info
= &vmstate_info_extra_state
,
1323 .flags
= VMS_SINGLE
,
1326 VMSTATE_END_OF_LIST()
1330 static const VMStateDescription vmstate_virtio_device_endian
= {
1331 .name
= "virtio/device_endian",
1333 .minimum_version_id
= 1,
1334 .needed
= &virtio_device_endian_needed
,
1335 .fields
= (VMStateField
[]) {
1336 VMSTATE_UINT8(device_endian
, VirtIODevice
),
1337 VMSTATE_END_OF_LIST()
1341 static const VMStateDescription vmstate_virtio_64bit_features
= {
1342 .name
= "virtio/64bit_features",
1344 .minimum_version_id
= 1,
1345 .needed
= &virtio_64bit_features_needed
,
1346 .fields
= (VMStateField
[]) {
1347 VMSTATE_UINT64(guest_features
, VirtIODevice
),
1348 VMSTATE_END_OF_LIST()
1352 static const VMStateDescription vmstate_virtio
= {
1355 .minimum_version_id
= 1,
1356 .minimum_version_id_old
= 1,
1357 .fields
= (VMStateField
[]) {
1358 VMSTATE_END_OF_LIST()
1360 .subsections
= (const VMStateDescription
*[]) {
1361 &vmstate_virtio_device_endian
,
1362 &vmstate_virtio_64bit_features
,
1363 &vmstate_virtio_virtqueues
,
1364 &vmstate_virtio_ringsize
,
1365 &vmstate_virtio_extra_state
,
1370 void virtio_save(VirtIODevice
*vdev
, QEMUFile
*f
)
1372 BusState
*qbus
= qdev_get_parent_bus(DEVICE(vdev
));
1373 VirtioBusClass
*k
= VIRTIO_BUS_GET_CLASS(qbus
);
1374 VirtioDeviceClass
*vdc
= VIRTIO_DEVICE_GET_CLASS(vdev
);
1375 uint32_t guest_features_lo
= (vdev
->guest_features
& 0xffffffff);
1378 if (k
->save_config
) {
1379 k
->save_config(qbus
->parent
, f
);
1382 qemu_put_8s(f
, &vdev
->status
);
1383 qemu_put_8s(f
, &vdev
->isr
);
1384 qemu_put_be16s(f
, &vdev
->queue_sel
);
1385 qemu_put_be32s(f
, &guest_features_lo
);
1386 qemu_put_be32(f
, vdev
->config_len
);
1387 qemu_put_buffer(f
, vdev
->config
, vdev
->config_len
);
1389 for (i
= 0; i
< VIRTIO_QUEUE_MAX
; i
++) {
1390 if (vdev
->vq
[i
].vring
.num
== 0)
1394 qemu_put_be32(f
, i
);
1396 for (i
= 0; i
< VIRTIO_QUEUE_MAX
; i
++) {
1397 if (vdev
->vq
[i
].vring
.num
== 0)
1400 qemu_put_be32(f
, vdev
->vq
[i
].vring
.num
);
1401 if (k
->has_variable_vring_alignment
) {
1402 qemu_put_be32(f
, vdev
->vq
[i
].vring
.align
);
1404 /* XXX virtio-1 devices */
1405 qemu_put_be64(f
, vdev
->vq
[i
].vring
.desc
);
1406 qemu_put_be16s(f
, &vdev
->vq
[i
].last_avail_idx
);
1407 if (k
->save_queue
) {
1408 k
->save_queue(qbus
->parent
, i
, f
);
1412 if (vdc
->save
!= NULL
) {
1417 vmstate_save_state(f
, &vmstate_virtio
, vdev
, NULL
);
1420 static int virtio_set_features_nocheck(VirtIODevice
*vdev
, uint64_t val
)
1422 VirtioDeviceClass
*k
= VIRTIO_DEVICE_GET_CLASS(vdev
);
1423 bool bad
= (val
& ~(vdev
->host_features
)) != 0;
1425 val
&= vdev
->host_features
;
1426 if (k
->set_features
) {
1427 k
->set_features(vdev
, val
);
1429 vdev
->guest_features
= val
;
1430 return bad
? -1 : 0;
1433 int virtio_set_features(VirtIODevice
*vdev
, uint64_t val
)
1436 * The driver must not attempt to set features after feature negotiation
1439 if (vdev
->status
& VIRTIO_CONFIG_S_FEATURES_OK
) {
1442 return virtio_set_features_nocheck(vdev
, val
);
1445 int virtio_load(VirtIODevice
*vdev
, QEMUFile
*f
, int version_id
)
1451 BusState
*qbus
= qdev_get_parent_bus(DEVICE(vdev
));
1452 VirtioBusClass
*k
= VIRTIO_BUS_GET_CLASS(qbus
);
1453 VirtioDeviceClass
*vdc
= VIRTIO_DEVICE_GET_CLASS(vdev
);
1456 * We poison the endianness to ensure it does not get used before
1457 * subsections have been loaded.
1459 vdev
->device_endian
= VIRTIO_DEVICE_ENDIAN_UNKNOWN
;
1461 if (k
->load_config
) {
1462 ret
= k
->load_config(qbus
->parent
, f
);
1467 qemu_get_8s(f
, &vdev
->status
);
1468 qemu_get_8s(f
, &vdev
->isr
);
1469 qemu_get_be16s(f
, &vdev
->queue_sel
);
1470 if (vdev
->queue_sel
>= VIRTIO_QUEUE_MAX
) {
1473 qemu_get_be32s(f
, &features
);
1475 config_len
= qemu_get_be32(f
);
1478 * There are cases where the incoming config can be bigger or smaller
1479 * than what we have; so load what we have space for, and skip
1480 * any excess that's in the stream.
1482 qemu_get_buffer(f
, vdev
->config
, MIN(config_len
, vdev
->config_len
));
1484 while (config_len
> vdev
->config_len
) {
1489 num
= qemu_get_be32(f
);
1491 if (num
> VIRTIO_QUEUE_MAX
) {
1492 error_report("Invalid number of virtqueues: 0x%x", num
);
1496 for (i
= 0; i
< num
; i
++) {
1497 vdev
->vq
[i
].vring
.num
= qemu_get_be32(f
);
1498 if (k
->has_variable_vring_alignment
) {
1499 vdev
->vq
[i
].vring
.align
= qemu_get_be32(f
);
1501 vdev
->vq
[i
].vring
.desc
= qemu_get_be64(f
);
1502 qemu_get_be16s(f
, &vdev
->vq
[i
].last_avail_idx
);
1503 vdev
->vq
[i
].signalled_used_valid
= false;
1504 vdev
->vq
[i
].notification
= true;
1506 if (vdev
->vq
[i
].vring
.desc
) {
1507 /* XXX virtio-1 devices */
1508 virtio_queue_update_rings(vdev
, i
);
1509 } else if (vdev
->vq
[i
].last_avail_idx
) {
1510 error_report("VQ %d address 0x0 "
1511 "inconsistent with Host index 0x%x",
1512 i
, vdev
->vq
[i
].last_avail_idx
);
1515 if (k
->load_queue
) {
1516 ret
= k
->load_queue(qbus
->parent
, i
, f
);
1522 virtio_notify_vector(vdev
, VIRTIO_NO_VECTOR
);
1524 if (vdc
->load
!= NULL
) {
1525 ret
= vdc
->load(vdev
, f
, version_id
);
1532 ret
= vmstate_load_state(f
, &vmstate_virtio
, vdev
, 1);
1537 if (vdev
->device_endian
== VIRTIO_DEVICE_ENDIAN_UNKNOWN
) {
1538 vdev
->device_endian
= virtio_default_endian();
1541 if (virtio_64bit_features_needed(vdev
)) {
1543 * Subsection load filled vdev->guest_features. Run them
1544 * through virtio_set_features to sanity-check them against
1547 uint64_t features64
= vdev
->guest_features
;
1548 if (virtio_set_features_nocheck(vdev
, features64
) < 0) {
1549 error_report("Features 0x%" PRIx64
" unsupported. "
1550 "Allowed features: 0x%" PRIx64
,
1551 features64
, vdev
->host_features
);
1555 if (virtio_set_features_nocheck(vdev
, features
) < 0) {
1556 error_report("Features 0x%x unsupported. "
1557 "Allowed features: 0x%" PRIx64
,
1558 features
, vdev
->host_features
);
1563 for (i
= 0; i
< num
; i
++) {
1564 if (vdev
->vq
[i
].vring
.desc
) {
1566 nheads
= vring_avail_idx(&vdev
->vq
[i
]) - vdev
->vq
[i
].last_avail_idx
;
1567 /* Check it isn't doing strange things with descriptor numbers. */
1568 if (nheads
> vdev
->vq
[i
].vring
.num
) {
1569 error_report("VQ %d size 0x%x Guest index 0x%x "
1570 "inconsistent with Host index 0x%x: delta 0x%x",
1571 i
, vdev
->vq
[i
].vring
.num
,
1572 vring_avail_idx(&vdev
->vq
[i
]),
1573 vdev
->vq
[i
].last_avail_idx
, nheads
);
1582 void virtio_cleanup(VirtIODevice
*vdev
)
1584 qemu_del_vm_change_state_handler(vdev
->vmstate
);
1585 g_free(vdev
->config
);
1587 g_free(vdev
->vector_queues
);
1590 static void virtio_vmstate_change(void *opaque
, int running
, RunState state
)
1592 VirtIODevice
*vdev
= opaque
;
1593 BusState
*qbus
= qdev_get_parent_bus(DEVICE(vdev
));
1594 VirtioBusClass
*k
= VIRTIO_BUS_GET_CLASS(qbus
);
1595 bool backend_run
= running
&& (vdev
->status
& VIRTIO_CONFIG_S_DRIVER_OK
);
1596 vdev
->vm_running
= running
;
1599 virtio_set_status(vdev
, vdev
->status
);
1602 if (k
->vmstate_change
) {
1603 k
->vmstate_change(qbus
->parent
, backend_run
);
1607 virtio_set_status(vdev
, vdev
->status
);
1611 void virtio_instance_init_common(Object
*proxy_obj
, void *data
,
1612 size_t vdev_size
, const char *vdev_name
)
1614 DeviceState
*vdev
= data
;
1616 object_initialize(vdev
, vdev_size
, vdev_name
);
1617 object_property_add_child(proxy_obj
, "virtio-backend", OBJECT(vdev
), NULL
);
1618 object_unref(OBJECT(vdev
));
1619 qdev_alias_all_properties(vdev
, proxy_obj
);
1622 void virtio_init(VirtIODevice
*vdev
, const char *name
,
1623 uint16_t device_id
, size_t config_size
)
1625 BusState
*qbus
= qdev_get_parent_bus(DEVICE(vdev
));
1626 VirtioBusClass
*k
= VIRTIO_BUS_GET_CLASS(qbus
);
1628 int nvectors
= k
->query_nvectors
? k
->query_nvectors(qbus
->parent
) : 0;
1631 vdev
->vector_queues
=
1632 g_malloc0(sizeof(*vdev
->vector_queues
) * nvectors
);
1635 vdev
->device_id
= device_id
;
1638 vdev
->queue_sel
= 0;
1639 vdev
->config_vector
= VIRTIO_NO_VECTOR
;
1640 vdev
->vq
= g_malloc0(sizeof(VirtQueue
) * VIRTIO_QUEUE_MAX
);
1641 vdev
->vm_running
= runstate_is_running();
1642 for (i
= 0; i
< VIRTIO_QUEUE_MAX
; i
++) {
1643 vdev
->vq
[i
].vector
= VIRTIO_NO_VECTOR
;
1644 vdev
->vq
[i
].vdev
= vdev
;
1645 vdev
->vq
[i
].queue_index
= i
;
1649 vdev
->config_len
= config_size
;
1650 if (vdev
->config_len
) {
1651 vdev
->config
= g_malloc0(config_size
);
1653 vdev
->config
= NULL
;
1655 vdev
->vmstate
= qemu_add_vm_change_state_handler(virtio_vmstate_change
,
1657 vdev
->device_endian
= virtio_default_endian();
1660 hwaddr
virtio_queue_get_desc_addr(VirtIODevice
*vdev
, int n
)
1662 return vdev
->vq
[n
].vring
.desc
;
1665 hwaddr
virtio_queue_get_avail_addr(VirtIODevice
*vdev
, int n
)
1667 return vdev
->vq
[n
].vring
.avail
;
1670 hwaddr
virtio_queue_get_used_addr(VirtIODevice
*vdev
, int n
)
1672 return vdev
->vq
[n
].vring
.used
;
1675 hwaddr
virtio_queue_get_ring_addr(VirtIODevice
*vdev
, int n
)
1677 return vdev
->vq
[n
].vring
.desc
;
1680 hwaddr
virtio_queue_get_desc_size(VirtIODevice
*vdev
, int n
)
1682 return sizeof(VRingDesc
) * vdev
->vq
[n
].vring
.num
;
1685 hwaddr
virtio_queue_get_avail_size(VirtIODevice
*vdev
, int n
)
1687 return offsetof(VRingAvail
, ring
) +
1688 sizeof(uint16_t) * vdev
->vq
[n
].vring
.num
;
1691 hwaddr
virtio_queue_get_used_size(VirtIODevice
*vdev
, int n
)
1693 return offsetof(VRingUsed
, ring
) +
1694 sizeof(VRingUsedElem
) * vdev
->vq
[n
].vring
.num
;
1697 hwaddr
virtio_queue_get_ring_size(VirtIODevice
*vdev
, int n
)
1699 return vdev
->vq
[n
].vring
.used
- vdev
->vq
[n
].vring
.desc
+
1700 virtio_queue_get_used_size(vdev
, n
);
1703 uint16_t virtio_queue_get_last_avail_idx(VirtIODevice
*vdev
, int n
)
1705 return vdev
->vq
[n
].last_avail_idx
;
1708 void virtio_queue_set_last_avail_idx(VirtIODevice
*vdev
, int n
, uint16_t idx
)
1710 vdev
->vq
[n
].last_avail_idx
= idx
;
1713 void virtio_queue_invalidate_signalled_used(VirtIODevice
*vdev
, int n
)
1715 vdev
->vq
[n
].signalled_used_valid
= false;
1718 VirtQueue
*virtio_get_queue(VirtIODevice
*vdev
, int n
)
1720 return vdev
->vq
+ n
;
1723 uint16_t virtio_get_queue_index(VirtQueue
*vq
)
1725 return vq
->queue_index
;
1728 static void virtio_queue_guest_notifier_read(EventNotifier
*n
)
1730 VirtQueue
*vq
= container_of(n
, VirtQueue
, guest_notifier
);
1731 if (event_notifier_test_and_clear(n
)) {
1736 void virtio_queue_set_guest_notifier_fd_handler(VirtQueue
*vq
, bool assign
,
1739 if (assign
&& !with_irqfd
) {
1740 event_notifier_set_handler(&vq
->guest_notifier
,
1741 virtio_queue_guest_notifier_read
);
1743 event_notifier_set_handler(&vq
->guest_notifier
, NULL
);
1746 /* Test and clear notifier before closing it,
1747 * in case poll callback didn't have time to run. */
1748 virtio_queue_guest_notifier_read(&vq
->guest_notifier
);
1752 EventNotifier
*virtio_queue_get_guest_notifier(VirtQueue
*vq
)
1754 return &vq
->guest_notifier
;
1757 static void virtio_queue_host_notifier_read(EventNotifier
*n
)
1759 VirtQueue
*vq
= container_of(n
, VirtQueue
, host_notifier
);
1760 if (event_notifier_test_and_clear(n
)) {
1761 virtio_queue_notify_vq(vq
);
1765 void virtio_queue_set_host_notifier_fd_handler(VirtQueue
*vq
, bool assign
,
1768 if (assign
&& set_handler
) {
1769 event_notifier_set_handler(&vq
->host_notifier
,
1770 virtio_queue_host_notifier_read
);
1772 event_notifier_set_handler(&vq
->host_notifier
, NULL
);
1775 /* Test and clear notifier before after disabling event,
1776 * in case poll callback didn't have time to run. */
1777 virtio_queue_host_notifier_read(&vq
->host_notifier
);
1781 EventNotifier
*virtio_queue_get_host_notifier(VirtQueue
*vq
)
1783 return &vq
->host_notifier
;
1786 void virtio_device_set_child_bus_name(VirtIODevice
*vdev
, char *bus_name
)
1788 g_free(vdev
->bus_name
);
1789 vdev
->bus_name
= g_strdup(bus_name
);
1792 static void virtio_device_realize(DeviceState
*dev
, Error
**errp
)
1794 VirtIODevice
*vdev
= VIRTIO_DEVICE(dev
);
1795 VirtioDeviceClass
*vdc
= VIRTIO_DEVICE_GET_CLASS(dev
);
1798 if (vdc
->realize
!= NULL
) {
1799 vdc
->realize(dev
, &err
);
1801 error_propagate(errp
, err
);
1806 virtio_bus_device_plugged(vdev
, &err
);
1808 error_propagate(errp
, err
);
1813 static void virtio_device_unrealize(DeviceState
*dev
, Error
**errp
)
1815 VirtIODevice
*vdev
= VIRTIO_DEVICE(dev
);
1816 VirtioDeviceClass
*vdc
= VIRTIO_DEVICE_GET_CLASS(dev
);
1819 virtio_bus_device_unplugged(vdev
);
1821 if (vdc
->unrealize
!= NULL
) {
1822 vdc
->unrealize(dev
, &err
);
1824 error_propagate(errp
, err
);
1829 g_free(vdev
->bus_name
);
1830 vdev
->bus_name
= NULL
;
1833 static Property virtio_properties
[] = {
1834 DEFINE_VIRTIO_COMMON_FEATURES(VirtIODevice
, host_features
),
1835 DEFINE_PROP_END_OF_LIST(),
1838 static void virtio_device_class_init(ObjectClass
*klass
, void *data
)
1840 /* Set the default value here. */
1841 DeviceClass
*dc
= DEVICE_CLASS(klass
);
1843 dc
->realize
= virtio_device_realize
;
1844 dc
->unrealize
= virtio_device_unrealize
;
1845 dc
->bus_type
= TYPE_VIRTIO_BUS
;
1846 dc
->props
= virtio_properties
;
1849 static const TypeInfo virtio_device_info
= {
1850 .name
= TYPE_VIRTIO_DEVICE
,
1851 .parent
= TYPE_DEVICE
,
1852 .instance_size
= sizeof(VirtIODevice
),
1853 .class_init
= virtio_device_class_init
,
1855 .class_size
= sizeof(VirtioDeviceClass
),
1858 static void virtio_register_types(void)
1860 type_register_static(&virtio_device_info
);
1863 type_init(virtio_register_types
)