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.
17 #include "qemu-error.h"
19 #include "qemu-barrier.h"
21 /* The alignment to use between consumer and producer parts of vring.
22 * x86 pagesize again. */
23 #define VIRTIO_PCI_VRING_ALIGN 4096
25 typedef struct VRingDesc
33 typedef struct VRingAvail
40 typedef struct VRingUsedElem
46 typedef struct VRingUsed
50 VRingUsedElem ring
[0];
56 target_phys_addr_t desc
;
57 target_phys_addr_t avail
;
58 target_phys_addr_t used
;
64 target_phys_addr_t pa
;
65 uint16_t last_avail_idx
;
66 /* Last used index value we have signalled on */
67 uint16_t signalled_used
;
69 /* Last used index value we have signalled on */
70 bool signalled_used_valid
;
72 /* Notification enabled? */
78 void (*handle_output
)(VirtIODevice
*vdev
, VirtQueue
*vq
);
80 EventNotifier guest_notifier
;
81 EventNotifier host_notifier
;
84 /* virt queue functions */
85 static void virtqueue_init(VirtQueue
*vq
)
87 target_phys_addr_t pa
= vq
->pa
;
90 vq
->vring
.avail
= pa
+ vq
->vring
.num
* sizeof(VRingDesc
);
91 vq
->vring
.used
= vring_align(vq
->vring
.avail
+
92 offsetof(VRingAvail
, ring
[vq
->vring
.num
]),
93 VIRTIO_PCI_VRING_ALIGN
);
96 static inline uint64_t vring_desc_addr(target_phys_addr_t desc_pa
, int i
)
98 target_phys_addr_t pa
;
99 pa
= desc_pa
+ sizeof(VRingDesc
) * i
+ offsetof(VRingDesc
, addr
);
103 static inline uint32_t vring_desc_len(target_phys_addr_t desc_pa
, int i
)
105 target_phys_addr_t pa
;
106 pa
= desc_pa
+ sizeof(VRingDesc
) * i
+ offsetof(VRingDesc
, len
);
110 static inline uint16_t vring_desc_flags(target_phys_addr_t desc_pa
, int i
)
112 target_phys_addr_t pa
;
113 pa
= desc_pa
+ sizeof(VRingDesc
) * i
+ offsetof(VRingDesc
, flags
);
114 return lduw_phys(pa
);
117 static inline uint16_t vring_desc_next(target_phys_addr_t desc_pa
, int i
)
119 target_phys_addr_t pa
;
120 pa
= desc_pa
+ sizeof(VRingDesc
) * i
+ offsetof(VRingDesc
, next
);
121 return lduw_phys(pa
);
124 static inline uint16_t vring_avail_flags(VirtQueue
*vq
)
126 target_phys_addr_t pa
;
127 pa
= vq
->vring
.avail
+ offsetof(VRingAvail
, flags
);
128 return lduw_phys(pa
);
131 static inline uint16_t vring_avail_idx(VirtQueue
*vq
)
133 target_phys_addr_t pa
;
134 pa
= vq
->vring
.avail
+ offsetof(VRingAvail
, idx
);
135 return lduw_phys(pa
);
138 static inline uint16_t vring_avail_ring(VirtQueue
*vq
, int i
)
140 target_phys_addr_t pa
;
141 pa
= vq
->vring
.avail
+ offsetof(VRingAvail
, ring
[i
]);
142 return lduw_phys(pa
);
145 static inline uint16_t vring_used_event(VirtQueue
*vq
)
147 return vring_avail_ring(vq
, vq
->vring
.num
);
150 static inline void vring_used_ring_id(VirtQueue
*vq
, int i
, uint32_t val
)
152 target_phys_addr_t pa
;
153 pa
= vq
->vring
.used
+ offsetof(VRingUsed
, ring
[i
].id
);
157 static inline void vring_used_ring_len(VirtQueue
*vq
, int i
, uint32_t val
)
159 target_phys_addr_t pa
;
160 pa
= vq
->vring
.used
+ offsetof(VRingUsed
, ring
[i
].len
);
164 static uint16_t vring_used_idx(VirtQueue
*vq
)
166 target_phys_addr_t pa
;
167 pa
= vq
->vring
.used
+ offsetof(VRingUsed
, idx
);
168 return lduw_phys(pa
);
171 static inline void vring_used_idx_set(VirtQueue
*vq
, uint16_t val
)
173 target_phys_addr_t pa
;
174 pa
= vq
->vring
.used
+ offsetof(VRingUsed
, idx
);
178 static inline void vring_used_flags_set_bit(VirtQueue
*vq
, int mask
)
180 target_phys_addr_t pa
;
181 pa
= vq
->vring
.used
+ offsetof(VRingUsed
, flags
);
182 stw_phys(pa
, lduw_phys(pa
) | mask
);
185 static inline void vring_used_flags_unset_bit(VirtQueue
*vq
, int mask
)
187 target_phys_addr_t pa
;
188 pa
= vq
->vring
.used
+ offsetof(VRingUsed
, flags
);
189 stw_phys(pa
, lduw_phys(pa
) & ~mask
);
192 static inline void vring_avail_event(VirtQueue
*vq
, uint16_t val
)
194 target_phys_addr_t pa
;
195 if (!vq
->notification
) {
198 pa
= vq
->vring
.used
+ offsetof(VRingUsed
, ring
[vq
->vring
.num
]);
202 void virtio_queue_set_notification(VirtQueue
*vq
, int enable
)
204 vq
->notification
= enable
;
205 if (vq
->vdev
->guest_features
& (1 << VIRTIO_RING_F_EVENT_IDX
)) {
206 vring_avail_event(vq
, vring_avail_idx(vq
));
208 vring_used_flags_unset_bit(vq
, VRING_USED_F_NO_NOTIFY
);
210 vring_used_flags_set_bit(vq
, VRING_USED_F_NO_NOTIFY
);
214 int virtio_queue_ready(VirtQueue
*vq
)
216 return vq
->vring
.avail
!= 0;
219 int virtio_queue_empty(VirtQueue
*vq
)
221 return vring_avail_idx(vq
) == vq
->last_avail_idx
;
224 void virtqueue_fill(VirtQueue
*vq
, const VirtQueueElement
*elem
,
225 unsigned int len
, unsigned int idx
)
230 trace_virtqueue_fill(vq
, elem
, len
, idx
);
233 for (i
= 0; i
< elem
->in_num
; i
++) {
234 size_t size
= MIN(len
- offset
, elem
->in_sg
[i
].iov_len
);
236 cpu_physical_memory_unmap(elem
->in_sg
[i
].iov_base
,
237 elem
->in_sg
[i
].iov_len
,
240 offset
+= elem
->in_sg
[i
].iov_len
;
243 for (i
= 0; i
< elem
->out_num
; i
++)
244 cpu_physical_memory_unmap(elem
->out_sg
[i
].iov_base
,
245 elem
->out_sg
[i
].iov_len
,
246 0, elem
->out_sg
[i
].iov_len
);
248 idx
= (idx
+ vring_used_idx(vq
)) % vq
->vring
.num
;
250 /* Get a pointer to the next entry in the used ring. */
251 vring_used_ring_id(vq
, idx
, elem
->index
);
252 vring_used_ring_len(vq
, idx
, len
);
255 void virtqueue_flush(VirtQueue
*vq
, unsigned int count
)
258 /* Make sure buffer is written before we update index. */
260 trace_virtqueue_flush(vq
, count
);
261 old
= vring_used_idx(vq
);
263 vring_used_idx_set(vq
, new);
265 if (unlikely((int16_t)(new - vq
->signalled_used
) < (uint16_t)(new - old
)))
266 vq
->signalled_used_valid
= false;
269 void virtqueue_push(VirtQueue
*vq
, const VirtQueueElement
*elem
,
272 virtqueue_fill(vq
, elem
, len
, 0);
273 virtqueue_flush(vq
, 1);
276 static int virtqueue_num_heads(VirtQueue
*vq
, unsigned int idx
)
278 uint16_t num_heads
= vring_avail_idx(vq
) - idx
;
280 /* Check it isn't doing very strange things with descriptor numbers. */
281 if (num_heads
> vq
->vring
.num
) {
282 error_report("Guest moved used index from %u to %u",
283 idx
, vring_avail_idx(vq
));
290 static unsigned int virtqueue_get_head(VirtQueue
*vq
, unsigned int idx
)
294 /* Grab the next descriptor number they're advertising, and increment
295 * the index we've seen. */
296 head
= vring_avail_ring(vq
, idx
% vq
->vring
.num
);
298 /* If their number is silly, that's a fatal mistake. */
299 if (head
>= vq
->vring
.num
) {
300 error_report("Guest says index %u is available", head
);
307 static unsigned virtqueue_next_desc(target_phys_addr_t desc_pa
,
308 unsigned int i
, unsigned int max
)
312 /* If this descriptor says it doesn't chain, we're done. */
313 if (!(vring_desc_flags(desc_pa
, i
) & VRING_DESC_F_NEXT
))
316 /* Check they're not leading us off end of descriptors. */
317 next
= vring_desc_next(desc_pa
, i
);
318 /* Make sure compiler knows to grab that: we don't want it changing! */
322 error_report("Desc next is %u", next
);
329 int virtqueue_avail_bytes(VirtQueue
*vq
, int in_bytes
, int out_bytes
)
332 int total_bufs
, in_total
, out_total
;
334 idx
= vq
->last_avail_idx
;
336 total_bufs
= in_total
= out_total
= 0;
337 while (virtqueue_num_heads(vq
, idx
)) {
338 unsigned int max
, num_bufs
, indirect
= 0;
339 target_phys_addr_t desc_pa
;
343 num_bufs
= total_bufs
;
344 i
= virtqueue_get_head(vq
, idx
++);
345 desc_pa
= vq
->vring
.desc
;
347 if (vring_desc_flags(desc_pa
, i
) & VRING_DESC_F_INDIRECT
) {
348 if (vring_desc_len(desc_pa
, i
) % sizeof(VRingDesc
)) {
349 error_report("Invalid size for indirect buffer table");
353 /* If we've got too many, that implies a descriptor loop. */
354 if (num_bufs
>= max
) {
355 error_report("Looped descriptor");
359 /* loop over the indirect descriptor table */
361 max
= vring_desc_len(desc_pa
, i
) / sizeof(VRingDesc
);
363 desc_pa
= vring_desc_addr(desc_pa
, i
);
367 /* If we've got too many, that implies a descriptor loop. */
368 if (++num_bufs
> max
) {
369 error_report("Looped descriptor");
373 if (vring_desc_flags(desc_pa
, i
) & VRING_DESC_F_WRITE
) {
375 (in_total
+= vring_desc_len(desc_pa
, i
)) >= in_bytes
)
379 (out_total
+= vring_desc_len(desc_pa
, i
)) >= out_bytes
)
382 } while ((i
= virtqueue_next_desc(desc_pa
, i
, max
)) != max
);
385 total_bufs
= num_bufs
;
393 void virtqueue_map_sg(struct iovec
*sg
, target_phys_addr_t
*addr
,
394 size_t num_sg
, int is_write
)
397 target_phys_addr_t len
;
399 for (i
= 0; i
< num_sg
; i
++) {
401 sg
[i
].iov_base
= cpu_physical_memory_map(addr
[i
], &len
, is_write
);
402 if (sg
[i
].iov_base
== NULL
|| len
!= sg
[i
].iov_len
) {
403 error_report("virtio: trying to map MMIO memory");
409 int virtqueue_pop(VirtQueue
*vq
, VirtQueueElement
*elem
)
411 unsigned int i
, head
, max
;
412 target_phys_addr_t desc_pa
= vq
->vring
.desc
;
414 if (!virtqueue_num_heads(vq
, vq
->last_avail_idx
))
417 /* When we start there are none of either input nor output. */
418 elem
->out_num
= elem
->in_num
= 0;
422 i
= head
= virtqueue_get_head(vq
, vq
->last_avail_idx
++);
423 if (vq
->vdev
->guest_features
& (1 << VIRTIO_RING_F_EVENT_IDX
)) {
424 vring_avail_event(vq
, vring_avail_idx(vq
));
427 if (vring_desc_flags(desc_pa
, i
) & VRING_DESC_F_INDIRECT
) {
428 if (vring_desc_len(desc_pa
, i
) % sizeof(VRingDesc
)) {
429 error_report("Invalid size for indirect buffer table");
433 /* loop over the indirect descriptor table */
434 max
= vring_desc_len(desc_pa
, i
) / sizeof(VRingDesc
);
435 desc_pa
= vring_desc_addr(desc_pa
, i
);
439 /* Collect all the descriptors */
443 if (vring_desc_flags(desc_pa
, i
) & VRING_DESC_F_WRITE
) {
444 if (elem
->in_num
>= ARRAY_SIZE(elem
->in_sg
)) {
445 error_report("Too many write descriptors in indirect table");
448 elem
->in_addr
[elem
->in_num
] = vring_desc_addr(desc_pa
, i
);
449 sg
= &elem
->in_sg
[elem
->in_num
++];
451 if (elem
->out_num
>= ARRAY_SIZE(elem
->out_sg
)) {
452 error_report("Too many read descriptors in indirect table");
455 elem
->out_addr
[elem
->out_num
] = vring_desc_addr(desc_pa
, i
);
456 sg
= &elem
->out_sg
[elem
->out_num
++];
459 sg
->iov_len
= vring_desc_len(desc_pa
, i
);
461 /* If we've got too many, that implies a descriptor loop. */
462 if ((elem
->in_num
+ elem
->out_num
) > max
) {
463 error_report("Looped descriptor");
466 } while ((i
= virtqueue_next_desc(desc_pa
, i
, max
)) != max
);
468 /* Now map what we have collected */
469 virtqueue_map_sg(elem
->in_sg
, elem
->in_addr
, elem
->in_num
, 1);
470 virtqueue_map_sg(elem
->out_sg
, elem
->out_addr
, elem
->out_num
, 0);
476 trace_virtqueue_pop(vq
, elem
, elem
->in_num
, elem
->out_num
);
477 return elem
->in_num
+ elem
->out_num
;
481 static void virtio_notify_vector(VirtIODevice
*vdev
, uint16_t vector
)
483 if (vdev
->binding
->notify
) {
484 vdev
->binding
->notify(vdev
->binding_opaque
, vector
);
488 void virtio_update_irq(VirtIODevice
*vdev
)
490 virtio_notify_vector(vdev
, VIRTIO_NO_VECTOR
);
493 void virtio_set_status(VirtIODevice
*vdev
, uint8_t val
)
495 trace_virtio_set_status(vdev
, val
);
497 if (vdev
->set_status
) {
498 vdev
->set_status(vdev
, val
);
503 void virtio_reset(void *opaque
)
505 VirtIODevice
*vdev
= opaque
;
508 virtio_set_status(vdev
, 0);
513 vdev
->guest_features
= 0;
517 vdev
->config_vector
= VIRTIO_NO_VECTOR
;
518 virtio_notify_vector(vdev
, vdev
->config_vector
);
520 for(i
= 0; i
< VIRTIO_PCI_QUEUE_MAX
; i
++) {
521 vdev
->vq
[i
].vring
.desc
= 0;
522 vdev
->vq
[i
].vring
.avail
= 0;
523 vdev
->vq
[i
].vring
.used
= 0;
524 vdev
->vq
[i
].last_avail_idx
= 0;
526 vdev
->vq
[i
].vector
= VIRTIO_NO_VECTOR
;
527 vdev
->vq
[i
].signalled_used
= 0;
528 vdev
->vq
[i
].signalled_used_valid
= false;
529 vdev
->vq
[i
].notification
= true;
533 uint32_t virtio_config_readb(VirtIODevice
*vdev
, uint32_t addr
)
537 vdev
->get_config(vdev
, vdev
->config
);
539 if (addr
> (vdev
->config_len
- sizeof(val
)))
542 val
= ldub_p(vdev
->config
+ addr
);
546 uint32_t virtio_config_readw(VirtIODevice
*vdev
, uint32_t addr
)
550 vdev
->get_config(vdev
, vdev
->config
);
552 if (addr
> (vdev
->config_len
- sizeof(val
)))
555 val
= lduw_p(vdev
->config
+ addr
);
559 uint32_t virtio_config_readl(VirtIODevice
*vdev
, uint32_t addr
)
563 vdev
->get_config(vdev
, vdev
->config
);
565 if (addr
> (vdev
->config_len
- sizeof(val
)))
568 val
= ldl_p(vdev
->config
+ addr
);
572 void virtio_config_writeb(VirtIODevice
*vdev
, uint32_t addr
, uint32_t data
)
576 if (addr
> (vdev
->config_len
- sizeof(val
)))
579 stb_p(vdev
->config
+ addr
, val
);
581 if (vdev
->set_config
)
582 vdev
->set_config(vdev
, vdev
->config
);
585 void virtio_config_writew(VirtIODevice
*vdev
, uint32_t addr
, uint32_t data
)
589 if (addr
> (vdev
->config_len
- sizeof(val
)))
592 stw_p(vdev
->config
+ addr
, val
);
594 if (vdev
->set_config
)
595 vdev
->set_config(vdev
, vdev
->config
);
598 void virtio_config_writel(VirtIODevice
*vdev
, uint32_t addr
, uint32_t data
)
602 if (addr
> (vdev
->config_len
- sizeof(val
)))
605 stl_p(vdev
->config
+ addr
, val
);
607 if (vdev
->set_config
)
608 vdev
->set_config(vdev
, vdev
->config
);
611 void virtio_queue_set_addr(VirtIODevice
*vdev
, int n
, target_phys_addr_t addr
)
613 vdev
->vq
[n
].pa
= addr
;
614 virtqueue_init(&vdev
->vq
[n
]);
617 target_phys_addr_t
virtio_queue_get_addr(VirtIODevice
*vdev
, int n
)
619 return vdev
->vq
[n
].pa
;
622 int virtio_queue_get_num(VirtIODevice
*vdev
, int n
)
624 return vdev
->vq
[n
].vring
.num
;
627 int virtio_queue_get_id(VirtQueue
*vq
)
629 VirtIODevice
*vdev
= vq
->vdev
;
630 assert(vq
>= &vdev
->vq
[0] && vq
< &vdev
->vq
[VIRTIO_PCI_QUEUE_MAX
]);
631 return vq
- &vdev
->vq
[0];
634 void virtio_queue_notify_vq(VirtQueue
*vq
)
636 if (vq
->vring
.desc
) {
637 VirtIODevice
*vdev
= vq
->vdev
;
638 trace_virtio_queue_notify(vdev
, vq
- vdev
->vq
, vq
);
639 vq
->handle_output(vdev
, vq
);
643 void virtio_queue_notify(VirtIODevice
*vdev
, int n
)
645 virtio_queue_notify_vq(&vdev
->vq
[n
]);
648 uint16_t virtio_queue_vector(VirtIODevice
*vdev
, int n
)
650 return n
< VIRTIO_PCI_QUEUE_MAX
? vdev
->vq
[n
].vector
:
654 void virtio_queue_set_vector(VirtIODevice
*vdev
, int n
, uint16_t vector
)
656 if (n
< VIRTIO_PCI_QUEUE_MAX
)
657 vdev
->vq
[n
].vector
= vector
;
660 VirtQueue
*virtio_add_queue(VirtIODevice
*vdev
, int queue_size
,
661 void (*handle_output
)(VirtIODevice
*, VirtQueue
*))
665 for (i
= 0; i
< VIRTIO_PCI_QUEUE_MAX
; i
++) {
666 if (vdev
->vq
[i
].vring
.num
== 0)
670 if (i
== VIRTIO_PCI_QUEUE_MAX
|| queue_size
> VIRTQUEUE_MAX_SIZE
)
673 vdev
->vq
[i
].vring
.num
= queue_size
;
674 vdev
->vq
[i
].handle_output
= handle_output
;
679 void virtio_irq(VirtQueue
*vq
)
681 trace_virtio_irq(vq
);
682 vq
->vdev
->isr
|= 0x01;
683 virtio_notify_vector(vq
->vdev
, vq
->vector
);
686 /* Assuming a given event_idx value from the other size, if
687 * we have just incremented index from old to new_idx,
688 * should we trigger an event? */
689 static inline int vring_need_event(uint16_t event
, uint16_t new, uint16_t old
)
691 /* Note: Xen has similar logic for notification hold-off
692 * in include/xen/interface/io/ring.h with req_event and req_prod
693 * corresponding to event_idx + 1 and new respectively.
694 * Note also that req_event and req_prod in Xen start at 1,
695 * event indexes in virtio start at 0. */
696 return (uint16_t)(new - event
- 1) < (uint16_t)(new - old
);
699 static bool vring_notify(VirtIODevice
*vdev
, VirtQueue
*vq
)
703 /* Always notify when queue is empty (when feature acknowledge) */
704 if (((vdev
->guest_features
& (1 << VIRTIO_F_NOTIFY_ON_EMPTY
)) &&
705 !vq
->inuse
&& vring_avail_idx(vq
) == vq
->last_avail_idx
)) {
709 if (!(vdev
->guest_features
& (1 << VIRTIO_RING_F_EVENT_IDX
))) {
710 return !(vring_avail_flags(vq
) & VRING_AVAIL_F_NO_INTERRUPT
);
713 v
= vq
->signalled_used_valid
;
714 vq
->signalled_used_valid
= true;
715 old
= vq
->signalled_used
;
716 new = vq
->signalled_used
= vring_used_idx(vq
);
717 return !v
|| vring_need_event(vring_used_event(vq
), new, old
);
720 void virtio_notify(VirtIODevice
*vdev
, VirtQueue
*vq
)
722 if (!vring_notify(vdev
, vq
)) {
726 trace_virtio_notify(vdev
, vq
);
728 virtio_notify_vector(vdev
, vq
->vector
);
731 void virtio_notify_config(VirtIODevice
*vdev
)
733 if (!(vdev
->status
& VIRTIO_CONFIG_S_DRIVER_OK
))
737 virtio_notify_vector(vdev
, vdev
->config_vector
);
740 void virtio_save(VirtIODevice
*vdev
, QEMUFile
*f
)
744 if (vdev
->binding
->save_config
)
745 vdev
->binding
->save_config(vdev
->binding_opaque
, f
);
747 qemu_put_8s(f
, &vdev
->status
);
748 qemu_put_8s(f
, &vdev
->isr
);
749 qemu_put_be16s(f
, &vdev
->queue_sel
);
750 qemu_put_be32s(f
, &vdev
->guest_features
);
751 qemu_put_be32(f
, vdev
->config_len
);
752 qemu_put_buffer(f
, vdev
->config
, vdev
->config_len
);
754 for (i
= 0; i
< VIRTIO_PCI_QUEUE_MAX
; i
++) {
755 if (vdev
->vq
[i
].vring
.num
== 0)
761 for (i
= 0; i
< VIRTIO_PCI_QUEUE_MAX
; i
++) {
762 if (vdev
->vq
[i
].vring
.num
== 0)
765 qemu_put_be32(f
, vdev
->vq
[i
].vring
.num
);
766 qemu_put_be64(f
, vdev
->vq
[i
].pa
);
767 qemu_put_be16s(f
, &vdev
->vq
[i
].last_avail_idx
);
768 if (vdev
->binding
->save_queue
)
769 vdev
->binding
->save_queue(vdev
->binding_opaque
, i
, f
);
773 int virtio_set_features(VirtIODevice
*vdev
, uint32_t val
)
775 uint32_t supported_features
=
776 vdev
->binding
->get_features(vdev
->binding_opaque
);
777 bool bad
= (val
& ~supported_features
) != 0;
779 val
&= supported_features
;
780 if (vdev
->set_features
) {
781 vdev
->set_features(vdev
, val
);
783 vdev
->guest_features
= val
;
787 int virtio_load(VirtIODevice
*vdev
, QEMUFile
*f
)
791 uint32_t supported_features
;
793 if (vdev
->binding
->load_config
) {
794 ret
= vdev
->binding
->load_config(vdev
->binding_opaque
, f
);
799 qemu_get_8s(f
, &vdev
->status
);
800 qemu_get_8s(f
, &vdev
->isr
);
801 qemu_get_be16s(f
, &vdev
->queue_sel
);
802 qemu_get_be32s(f
, &features
);
804 if (virtio_set_features(vdev
, features
) < 0) {
805 supported_features
= vdev
->binding
->get_features(vdev
->binding_opaque
);
806 error_report("Features 0x%x unsupported. Allowed features: 0x%x",
807 features
, supported_features
);
810 vdev
->config_len
= qemu_get_be32(f
);
811 qemu_get_buffer(f
, vdev
->config
, vdev
->config_len
);
813 num
= qemu_get_be32(f
);
815 for (i
= 0; i
< num
; i
++) {
816 vdev
->vq
[i
].vring
.num
= qemu_get_be32(f
);
817 vdev
->vq
[i
].pa
= qemu_get_be64(f
);
818 qemu_get_be16s(f
, &vdev
->vq
[i
].last_avail_idx
);
819 vdev
->vq
[i
].signalled_used_valid
= false;
820 vdev
->vq
[i
].notification
= true;
822 if (vdev
->vq
[i
].pa
) {
824 virtqueue_init(&vdev
->vq
[i
]);
825 nheads
= vring_avail_idx(&vdev
->vq
[i
]) - vdev
->vq
[i
].last_avail_idx
;
826 /* Check it isn't doing very strange things with descriptor numbers. */
827 if (nheads
> vdev
->vq
[i
].vring
.num
) {
828 error_report("VQ %d size 0x%x Guest index 0x%x "
829 "inconsistent with Host index 0x%x: delta 0x%x",
830 i
, vdev
->vq
[i
].vring
.num
,
831 vring_avail_idx(&vdev
->vq
[i
]),
832 vdev
->vq
[i
].last_avail_idx
, nheads
);
835 } else if (vdev
->vq
[i
].last_avail_idx
) {
836 error_report("VQ %d address 0x0 "
837 "inconsistent with Host index 0x%x",
838 i
, vdev
->vq
[i
].last_avail_idx
);
841 if (vdev
->binding
->load_queue
) {
842 ret
= vdev
->binding
->load_queue(vdev
->binding_opaque
, i
, f
);
848 virtio_notify_vector(vdev
, VIRTIO_NO_VECTOR
);
852 void virtio_cleanup(VirtIODevice
*vdev
)
854 qemu_del_vm_change_state_handler(vdev
->vmstate
);
855 g_free(vdev
->config
);
860 static void virtio_vmstate_change(void *opaque
, int running
, RunState state
)
862 VirtIODevice
*vdev
= opaque
;
863 bool backend_run
= running
&& (vdev
->status
& VIRTIO_CONFIG_S_DRIVER_OK
);
864 vdev
->vm_running
= running
;
867 virtio_set_status(vdev
, vdev
->status
);
870 if (vdev
->binding
->vmstate_change
) {
871 vdev
->binding
->vmstate_change(vdev
->binding_opaque
, backend_run
);
875 virtio_set_status(vdev
, vdev
->status
);
879 VirtIODevice
*virtio_common_init(const char *name
, uint16_t device_id
,
880 size_t config_size
, size_t struct_size
)
885 vdev
= g_malloc0(struct_size
);
887 vdev
->device_id
= device_id
;
891 vdev
->config_vector
= VIRTIO_NO_VECTOR
;
892 vdev
->vq
= g_malloc0(sizeof(VirtQueue
) * VIRTIO_PCI_QUEUE_MAX
);
893 vdev
->vm_running
= runstate_is_running();
894 for(i
= 0; i
< VIRTIO_PCI_QUEUE_MAX
; i
++) {
895 vdev
->vq
[i
].vector
= VIRTIO_NO_VECTOR
;
896 vdev
->vq
[i
].vdev
= vdev
;
900 vdev
->config_len
= config_size
;
901 if (vdev
->config_len
)
902 vdev
->config
= g_malloc0(config_size
);
906 vdev
->vmstate
= qemu_add_vm_change_state_handler(virtio_vmstate_change
, vdev
);
911 void virtio_bind_device(VirtIODevice
*vdev
, const VirtIOBindings
*binding
,
914 vdev
->binding
= binding
;
915 vdev
->binding_opaque
= opaque
;
918 target_phys_addr_t
virtio_queue_get_desc_addr(VirtIODevice
*vdev
, int n
)
920 return vdev
->vq
[n
].vring
.desc
;
923 target_phys_addr_t
virtio_queue_get_avail_addr(VirtIODevice
*vdev
, int n
)
925 return vdev
->vq
[n
].vring
.avail
;
928 target_phys_addr_t
virtio_queue_get_used_addr(VirtIODevice
*vdev
, int n
)
930 return vdev
->vq
[n
].vring
.used
;
933 target_phys_addr_t
virtio_queue_get_ring_addr(VirtIODevice
*vdev
, int n
)
935 return vdev
->vq
[n
].vring
.desc
;
938 target_phys_addr_t
virtio_queue_get_desc_size(VirtIODevice
*vdev
, int n
)
940 return sizeof(VRingDesc
) * vdev
->vq
[n
].vring
.num
;
943 target_phys_addr_t
virtio_queue_get_avail_size(VirtIODevice
*vdev
, int n
)
945 return offsetof(VRingAvail
, ring
) +
946 sizeof(uint64_t) * vdev
->vq
[n
].vring
.num
;
949 target_phys_addr_t
virtio_queue_get_used_size(VirtIODevice
*vdev
, int n
)
951 return offsetof(VRingUsed
, ring
) +
952 sizeof(VRingUsedElem
) * vdev
->vq
[n
].vring
.num
;
955 target_phys_addr_t
virtio_queue_get_ring_size(VirtIODevice
*vdev
, int n
)
957 return vdev
->vq
[n
].vring
.used
- vdev
->vq
[n
].vring
.desc
+
958 virtio_queue_get_used_size(vdev
, n
);
961 uint16_t virtio_queue_get_last_avail_idx(VirtIODevice
*vdev
, int n
)
963 return vdev
->vq
[n
].last_avail_idx
;
966 void virtio_queue_set_last_avail_idx(VirtIODevice
*vdev
, int n
, uint16_t idx
)
968 vdev
->vq
[n
].last_avail_idx
= idx
;
971 VirtQueue
*virtio_get_queue(VirtIODevice
*vdev
, int n
)
976 EventNotifier
*virtio_queue_get_guest_notifier(VirtQueue
*vq
)
978 return &vq
->guest_notifier
;
980 EventNotifier
*virtio_queue_get_host_notifier(VirtQueue
*vq
)
982 return &vq
->host_notifier
;