1
2
3
4
5
6
7
8
9
10
11
12
13
14#include "qemu/osdep.h"
15#include "qapi/error.h"
16#include "qemu-common.h"
17#include "cpu.h"
18#include "trace.h"
19#include "exec/address-spaces.h"
20#include "qemu/error-report.h"
21#include "hw/virtio/virtio.h"
22#include "qemu/atomic.h"
23#include "hw/virtio/virtio-bus.h"
24#include "migration/migration.h"
25#include "hw/virtio/virtio-access.h"
26
27
28
29
30
31
32#define VIRTIO_PCI_VRING_ALIGN 4096
33
34typedef struct VRingDesc
35{
36 uint64_t addr;
37 uint32_t len;
38 uint16_t flags;
39 uint16_t next;
40} VRingDesc;
41
42typedef struct VRingAvail
43{
44 uint16_t flags;
45 uint16_t idx;
46 uint16_t ring[0];
47} VRingAvail;
48
49typedef struct VRingUsedElem
50{
51 uint32_t id;
52 uint32_t len;
53} VRingUsedElem;
54
55typedef struct VRingUsed
56{
57 uint16_t flags;
58 uint16_t idx;
59 VRingUsedElem ring[0];
60} VRingUsed;
61
62typedef struct VRing
63{
64 unsigned int num;
65 unsigned int num_default;
66 unsigned int align;
67 hwaddr desc;
68 hwaddr avail;
69 hwaddr used;
70} VRing;
71
72struct VirtQueue
73{
74 VRing vring;
75
76
77 uint16_t last_avail_idx;
78
79
80 uint16_t shadow_avail_idx;
81
82 uint16_t used_idx;
83
84
85 uint16_t signalled_used;
86
87
88 bool signalled_used_valid;
89
90
91 bool notification;
92
93 uint16_t queue_index;
94
95 int inuse;
96
97 uint16_t vector;
98 void (*handle_output)(VirtIODevice *vdev, VirtQueue *vq);
99 void (*handle_aio_output)(VirtIODevice *vdev, VirtQueue *vq);
100 VirtIODevice *vdev;
101 EventNotifier guest_notifier;
102 EventNotifier host_notifier;
103 QLIST_ENTRY(VirtQueue) node;
104};
105
106
107void virtio_queue_update_rings(VirtIODevice *vdev, int n)
108{
109 VRing *vring = &vdev->vq[n].vring;
110
111 if (!vring->desc) {
112
113 return;
114 }
115 vring->avail = vring->desc + vring->num * sizeof(VRingDesc);
116 vring->used = vring_align(vring->avail +
117 offsetof(VRingAvail, ring[vring->num]),
118 vring->align);
119}
120
121static void vring_desc_read(VirtIODevice *vdev, VRingDesc *desc,
122 hwaddr desc_pa, int i)
123{
124 address_space_read(&address_space_memory, desc_pa + i * sizeof(VRingDesc),
125 MEMTXATTRS_UNSPECIFIED, (void *)desc, sizeof(VRingDesc));
126 virtio_tswap64s(vdev, &desc->addr);
127 virtio_tswap32s(vdev, &desc->len);
128 virtio_tswap16s(vdev, &desc->flags);
129 virtio_tswap16s(vdev, &desc->next);
130}
131
132static inline uint16_t vring_avail_flags(VirtQueue *vq)
133{
134 hwaddr pa;
135 pa = vq->vring.avail + offsetof(VRingAvail, flags);
136 return virtio_lduw_phys(vq->vdev, pa);
137}
138
139static inline uint16_t vring_avail_idx(VirtQueue *vq)
140{
141 hwaddr pa;
142 pa = vq->vring.avail + offsetof(VRingAvail, idx);
143 vq->shadow_avail_idx = virtio_lduw_phys(vq->vdev, pa);
144 return vq->shadow_avail_idx;
145}
146
147static inline uint16_t vring_avail_ring(VirtQueue *vq, int i)
148{
149 hwaddr pa;
150 pa = vq->vring.avail + offsetof(VRingAvail, ring[i]);
151 return virtio_lduw_phys(vq->vdev, pa);
152}
153
154static inline uint16_t vring_get_used_event(VirtQueue *vq)
155{
156 return vring_avail_ring(vq, vq->vring.num);
157}
158
159static inline void vring_used_write(VirtQueue *vq, VRingUsedElem *uelem,
160 int i)
161{
162 hwaddr pa;
163 virtio_tswap32s(vq->vdev, &uelem->id);
164 virtio_tswap32s(vq->vdev, &uelem->len);
165 pa = vq->vring.used + offsetof(VRingUsed, ring[i]);
166 address_space_write(&address_space_memory, pa, MEMTXATTRS_UNSPECIFIED,
167 (void *)uelem, sizeof(VRingUsedElem));
168}
169
170static uint16_t vring_used_idx(VirtQueue *vq)
171{
172 hwaddr pa;
173 pa = vq->vring.used + offsetof(VRingUsed, idx);
174 return virtio_lduw_phys(vq->vdev, pa);
175}
176
177static inline void vring_used_idx_set(VirtQueue *vq, uint16_t val)
178{
179 hwaddr pa;
180 pa = vq->vring.used + offsetof(VRingUsed, idx);
181 virtio_stw_phys(vq->vdev, pa, val);
182 vq->used_idx = val;
183}
184
185static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask)
186{
187 VirtIODevice *vdev = vq->vdev;
188 hwaddr pa;
189 pa = vq->vring.used + offsetof(VRingUsed, flags);
190 virtio_stw_phys(vdev, pa, virtio_lduw_phys(vdev, pa) | mask);
191}
192
193static inline void vring_used_flags_unset_bit(VirtQueue *vq, int mask)
194{
195 VirtIODevice *vdev = vq->vdev;
196 hwaddr pa;
197 pa = vq->vring.used + offsetof(VRingUsed, flags);
198 virtio_stw_phys(vdev, pa, virtio_lduw_phys(vdev, pa) & ~mask);
199}
200
201static inline void vring_set_avail_event(VirtQueue *vq, uint16_t val)
202{
203 hwaddr pa;
204 if (!vq->notification) {
205 return;
206 }
207 pa = vq->vring.used + offsetof(VRingUsed, ring[vq->vring.num]);
208 virtio_stw_phys(vq->vdev, pa, val);
209}
210
211void virtio_queue_set_notification(VirtQueue *vq, int enable)
212{
213 vq->notification = enable;
214 if (virtio_vdev_has_feature(vq->vdev, VIRTIO_RING_F_EVENT_IDX)) {
215 vring_set_avail_event(vq, vring_avail_idx(vq));
216 } else if (enable) {
217 vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY);
218 } else {
219 vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY);
220 }
221 if (enable) {
222
223 smp_mb();
224 }
225}
226
227int virtio_queue_ready(VirtQueue *vq)
228{
229 return vq->vring.avail != 0;
230}
231
232
233
234int virtio_queue_empty(VirtQueue *vq)
235{
236 if (vq->shadow_avail_idx != vq->last_avail_idx) {
237 return 0;
238 }
239
240 return vring_avail_idx(vq) == vq->last_avail_idx;
241}
242
243static void virtqueue_unmap_sg(VirtQueue *vq, const VirtQueueElement *elem,
244 unsigned int len)
245{
246 unsigned int offset;
247 int i;
248
249 offset = 0;
250 for (i = 0; i < elem->in_num; i++) {
251 size_t size = MIN(len - offset, elem->in_sg[i].iov_len);
252
253 cpu_physical_memory_unmap(elem->in_sg[i].iov_base,
254 elem->in_sg[i].iov_len,
255 1, size);
256
257 offset += size;
258 }
259
260 for (i = 0; i < elem->out_num; i++)
261 cpu_physical_memory_unmap(elem->out_sg[i].iov_base,
262 elem->out_sg[i].iov_len,
263 0, elem->out_sg[i].iov_len);
264}
265
266void virtqueue_discard(VirtQueue *vq, const VirtQueueElement *elem,
267 unsigned int len)
268{
269 vq->last_avail_idx--;
270 virtqueue_unmap_sg(vq, elem, len);
271}
272
273void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,
274 unsigned int len, unsigned int idx)
275{
276 VRingUsedElem uelem;
277
278 trace_virtqueue_fill(vq, elem, len, idx);
279
280 virtqueue_unmap_sg(vq, elem, len);
281
282 idx = (idx + vq->used_idx) % vq->vring.num;
283
284 uelem.id = elem->index;
285 uelem.len = len;
286 vring_used_write(vq, &uelem, idx);
287}
288
289void virtqueue_flush(VirtQueue *vq, unsigned int count)
290{
291 uint16_t old, new;
292
293 smp_wmb();
294 trace_virtqueue_flush(vq, count);
295 old = vq->used_idx;
296 new = old + count;
297 vring_used_idx_set(vq, new);
298 vq->inuse -= count;
299 if (unlikely((int16_t)(new - vq->signalled_used) < (uint16_t)(new - old)))
300 vq->signalled_used_valid = false;
301}
302
303void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,
304 unsigned int len)
305{
306 virtqueue_fill(vq, elem, len, 0);
307 virtqueue_flush(vq, 1);
308}
309
310static int virtqueue_num_heads(VirtQueue *vq, unsigned int idx)
311{
312 uint16_t num_heads = vring_avail_idx(vq) - idx;
313
314
315 if (num_heads > vq->vring.num) {
316 error_report("Guest moved used index from %u to %u",
317 idx, vq->shadow_avail_idx);
318 exit(1);
319 }
320
321
322 if (num_heads) {
323 smp_rmb();
324 }
325
326 return num_heads;
327}
328
329static unsigned int virtqueue_get_head(VirtQueue *vq, unsigned int idx)
330{
331 unsigned int head;
332
333
334
335 head = vring_avail_ring(vq, idx % vq->vring.num);
336
337
338 if (head >= vq->vring.num) {
339 error_report("Guest says index %u is available", head);
340 exit(1);
341 }
342
343 return head;
344}
345
346static unsigned virtqueue_read_next_desc(VirtIODevice *vdev, VRingDesc *desc,
347 hwaddr desc_pa, unsigned int max)
348{
349 unsigned int next;
350
351
352 if (!(desc->flags & VRING_DESC_F_NEXT)) {
353 return max;
354 }
355
356
357 next = desc->next;
358
359 smp_wmb();
360
361 if (next >= max) {
362 error_report("Desc next is %u", next);
363 exit(1);
364 }
365
366 vring_desc_read(vdev, desc, desc_pa, next);
367 return next;
368}
369
370void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes,
371 unsigned int *out_bytes,
372 unsigned max_in_bytes, unsigned max_out_bytes)
373{
374 unsigned int idx;
375 unsigned int total_bufs, in_total, out_total;
376
377 idx = vq->last_avail_idx;
378
379 total_bufs = in_total = out_total = 0;
380 while (virtqueue_num_heads(vq, idx)) {
381 VirtIODevice *vdev = vq->vdev;
382 unsigned int max, num_bufs, indirect = 0;
383 VRingDesc desc;
384 hwaddr desc_pa;
385 int i;
386
387 max = vq->vring.num;
388 num_bufs = total_bufs;
389 i = virtqueue_get_head(vq, idx++);
390 desc_pa = vq->vring.desc;
391 vring_desc_read(vdev, &desc, desc_pa, i);
392
393 if (desc.flags & VRING_DESC_F_INDIRECT) {
394 if (desc.len % sizeof(VRingDesc)) {
395 error_report("Invalid size for indirect buffer table");
396 exit(1);
397 }
398
399
400 if (num_bufs >= max) {
401 error_report("Looped descriptor");
402 exit(1);
403 }
404
405
406 indirect = 1;
407 max = desc.len / sizeof(VRingDesc);
408 desc_pa = desc.addr;
409 num_bufs = i = 0;
410 vring_desc_read(vdev, &desc, desc_pa, i);
411 }
412
413 do {
414
415 if (++num_bufs > max) {
416 error_report("Looped descriptor");
417 exit(1);
418 }
419
420 if (desc.flags & VRING_DESC_F_WRITE) {
421 in_total += desc.len;
422 } else {
423 out_total += desc.len;
424 }
425 if (in_total >= max_in_bytes && out_total >= max_out_bytes) {
426 goto done;
427 }
428 } while ((i = virtqueue_read_next_desc(vdev, &desc, desc_pa, max)) != max);
429
430 if (!indirect)
431 total_bufs = num_bufs;
432 else
433 total_bufs++;
434 }
435done:
436 if (in_bytes) {
437 *in_bytes = in_total;
438 }
439 if (out_bytes) {
440 *out_bytes = out_total;
441 }
442}
443
444int virtqueue_avail_bytes(VirtQueue *vq, unsigned int in_bytes,
445 unsigned int out_bytes)
446{
447 unsigned int in_total, out_total;
448
449 virtqueue_get_avail_bytes(vq, &in_total, &out_total, in_bytes, out_bytes);
450 return in_bytes <= in_total && out_bytes <= out_total;
451}
452
453static void virtqueue_map_desc(unsigned int *p_num_sg, hwaddr *addr, struct iovec *iov,
454 unsigned int max_num_sg, bool is_write,
455 hwaddr pa, size_t sz)
456{
457 unsigned num_sg = *p_num_sg;
458 assert(num_sg <= max_num_sg);
459
460 while (sz) {
461 hwaddr len = sz;
462
463 if (num_sg == max_num_sg) {
464 error_report("virtio: too many write descriptors in indirect table");
465 exit(1);
466 }
467
468 iov[num_sg].iov_base = cpu_physical_memory_map(pa, &len, is_write);
469 iov[num_sg].iov_len = len;
470 addr[num_sg] = pa;
471
472 sz -= len;
473 pa += len;
474 num_sg++;
475 }
476 *p_num_sg = num_sg;
477}
478
479static void virtqueue_map_iovec(struct iovec *sg, hwaddr *addr,
480 unsigned int *num_sg, unsigned int max_size,
481 int is_write)
482{
483 unsigned int i;
484 hwaddr len;
485
486
487
488
489
490
491
492
493#ifdef NDEBUG
494#error building with NDEBUG is not supported
495#endif
496 assert(*num_sg <= max_size);
497
498 for (i = 0; i < *num_sg; i++) {
499 len = sg[i].iov_len;
500 sg[i].iov_base = cpu_physical_memory_map(addr[i], &len, is_write);
501 if (!sg[i].iov_base) {
502 error_report("virtio: error trying to map MMIO memory");
503 exit(1);
504 }
505 if (len != sg[i].iov_len) {
506 error_report("virtio: unexpected memory split");
507 exit(1);
508 }
509 }
510}
511
512void virtqueue_map(VirtQueueElement *elem)
513{
514 virtqueue_map_iovec(elem->in_sg, elem->in_addr, &elem->in_num,
515 VIRTQUEUE_MAX_SIZE, 1);
516 virtqueue_map_iovec(elem->out_sg, elem->out_addr, &elem->out_num,
517 VIRTQUEUE_MAX_SIZE, 0);
518}
519
520void *virtqueue_alloc_element(size_t sz, unsigned out_num, unsigned in_num)
521{
522 VirtQueueElement *elem;
523 size_t in_addr_ofs = QEMU_ALIGN_UP(sz, __alignof__(elem->in_addr[0]));
524 size_t out_addr_ofs = in_addr_ofs + in_num * sizeof(elem->in_addr[0]);
525 size_t out_addr_end = out_addr_ofs + out_num * sizeof(elem->out_addr[0]);
526 size_t in_sg_ofs = QEMU_ALIGN_UP(out_addr_end, __alignof__(elem->in_sg[0]));
527 size_t out_sg_ofs = in_sg_ofs + in_num * sizeof(elem->in_sg[0]);
528 size_t out_sg_end = out_sg_ofs + out_num * sizeof(elem->out_sg[0]);
529
530 assert(sz >= sizeof(VirtQueueElement));
531 elem = g_malloc(out_sg_end);
532 elem->out_num = out_num;
533 elem->in_num = in_num;
534 elem->in_addr = (void *)elem + in_addr_ofs;
535 elem->out_addr = (void *)elem + out_addr_ofs;
536 elem->in_sg = (void *)elem + in_sg_ofs;
537 elem->out_sg = (void *)elem + out_sg_ofs;
538 return elem;
539}
540
541void *virtqueue_pop(VirtQueue *vq, size_t sz)
542{
543 unsigned int i, head, max;
544 hwaddr desc_pa = vq->vring.desc;
545 VirtIODevice *vdev = vq->vdev;
546 VirtQueueElement *elem;
547 unsigned out_num, in_num;
548 hwaddr addr[VIRTQUEUE_MAX_SIZE];
549 struct iovec iov[VIRTQUEUE_MAX_SIZE];
550 VRingDesc desc;
551
552 if (virtio_queue_empty(vq)) {
553 return NULL;
554 }
555
556
557 smp_rmb();
558
559
560 out_num = in_num = 0;
561
562 max = vq->vring.num;
563
564 i = head = virtqueue_get_head(vq, vq->last_avail_idx++);
565 if (virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) {
566 vring_set_avail_event(vq, vq->last_avail_idx);
567 }
568
569 vring_desc_read(vdev, &desc, desc_pa, i);
570 if (desc.flags & VRING_DESC_F_INDIRECT) {
571 if (desc.len % sizeof(VRingDesc)) {
572 error_report("Invalid size for indirect buffer table");
573 exit(1);
574 }
575
576
577 max = desc.len / sizeof(VRingDesc);
578 desc_pa = desc.addr;
579 i = 0;
580 vring_desc_read(vdev, &desc, desc_pa, i);
581 }
582
583
584 do {
585 if (desc.flags & VRING_DESC_F_WRITE) {
586 virtqueue_map_desc(&in_num, addr + out_num, iov + out_num,
587 VIRTQUEUE_MAX_SIZE - out_num, true, desc.addr, desc.len);
588 } else {
589 if (in_num) {
590 error_report("Incorrect order for descriptors");
591 exit(1);
592 }
593 virtqueue_map_desc(&out_num, addr, iov,
594 VIRTQUEUE_MAX_SIZE, false, desc.addr, desc.len);
595 }
596
597
598 if ((in_num + out_num) > max) {
599 error_report("Looped descriptor");
600 exit(1);
601 }
602 } while ((i = virtqueue_read_next_desc(vdev, &desc, desc_pa, max)) != max);
603
604
605 elem = virtqueue_alloc_element(sz, out_num, in_num);
606 elem->index = head;
607 for (i = 0; i < out_num; i++) {
608 elem->out_addr[i] = addr[i];
609 elem->out_sg[i] = iov[i];
610 }
611 for (i = 0; i < in_num; i++) {
612 elem->in_addr[i] = addr[out_num + i];
613 elem->in_sg[i] = iov[out_num + i];
614 }
615
616 vq->inuse++;
617
618 trace_virtqueue_pop(vq, elem, elem->in_num, elem->out_num);
619 return elem;
620}
621
622
623
624
625
626
627
628
629typedef struct VirtQueueElementOld {
630 unsigned int index;
631 unsigned int out_num;
632 unsigned int in_num;
633 hwaddr in_addr[VIRTQUEUE_MAX_SIZE];
634 hwaddr out_addr[VIRTQUEUE_MAX_SIZE];
635 struct iovec in_sg[VIRTQUEUE_MAX_SIZE];
636 struct iovec out_sg[VIRTQUEUE_MAX_SIZE];
637} VirtQueueElementOld;
638
639void *qemu_get_virtqueue_element(QEMUFile *f, size_t sz)
640{
641 VirtQueueElement *elem;
642 VirtQueueElementOld data;
643 int i;
644
645 qemu_get_buffer(f, (uint8_t *)&data, sizeof(VirtQueueElementOld));
646
647 elem = virtqueue_alloc_element(sz, data.out_num, data.in_num);
648 elem->index = data.index;
649
650 for (i = 0; i < elem->in_num; i++) {
651 elem->in_addr[i] = data.in_addr[i];
652 }
653
654 for (i = 0; i < elem->out_num; i++) {
655 elem->out_addr[i] = data.out_addr[i];
656 }
657
658 for (i = 0; i < elem->in_num; i++) {
659
660 elem->in_sg[i].iov_base = 0;
661 elem->in_sg[i].iov_len = data.in_sg[i].iov_len;
662 }
663
664 for (i = 0; i < elem->out_num; i++) {
665
666 elem->out_sg[i].iov_base = 0;
667 elem->out_sg[i].iov_len = data.out_sg[i].iov_len;
668 }
669
670 virtqueue_map(elem);
671 return elem;
672}
673
674void qemu_put_virtqueue_element(QEMUFile *f, VirtQueueElement *elem)
675{
676 VirtQueueElementOld data;
677 int i;
678
679 memset(&data, 0, sizeof(data));
680 data.index = elem->index;
681 data.in_num = elem->in_num;
682 data.out_num = elem->out_num;
683
684 for (i = 0; i < elem->in_num; i++) {
685 data.in_addr[i] = elem->in_addr[i];
686 }
687
688 for (i = 0; i < elem->out_num; i++) {
689 data.out_addr[i] = elem->out_addr[i];
690 }
691
692 for (i = 0; i < elem->in_num; i++) {
693
694
695 data.in_sg[i].iov_len = elem->in_sg[i].iov_len;
696 }
697
698 for (i = 0; i < elem->out_num; i++) {
699
700 data.out_sg[i].iov_len = elem->out_sg[i].iov_len;
701 }
702 qemu_put_buffer(f, (uint8_t *)&data, sizeof(VirtQueueElementOld));
703}
704
705
706static void virtio_notify_vector(VirtIODevice *vdev, uint16_t vector)
707{
708 BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
709 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
710
711 if (k->notify) {
712 k->notify(qbus->parent, vector);
713 }
714}
715
716void virtio_update_irq(VirtIODevice *vdev)
717{
718 virtio_notify_vector(vdev, VIRTIO_NO_VECTOR);
719}
720
721static int virtio_validate_features(VirtIODevice *vdev)
722{
723 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
724
725 if (k->validate_features) {
726 return k->validate_features(vdev);
727 } else {
728 return 0;
729 }
730}
731
732int virtio_set_status(VirtIODevice *vdev, uint8_t val)
733{
734 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
735 trace_virtio_set_status(vdev, val);
736
737 if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) {
738 if (!(vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) &&
739 val & VIRTIO_CONFIG_S_FEATURES_OK) {
740 int ret = virtio_validate_features(vdev);
741
742 if (ret) {
743 return ret;
744 }
745 }
746 }
747 if (k->set_status) {
748 k->set_status(vdev, val);
749 }
750 vdev->status = val;
751 return 0;
752}
753
754bool target_words_bigendian(void);
755static enum virtio_device_endian virtio_default_endian(void)
756{
757 if (target_words_bigendian()) {
758 return VIRTIO_DEVICE_ENDIAN_BIG;
759 } else {
760 return VIRTIO_DEVICE_ENDIAN_LITTLE;
761 }
762}
763
764static enum virtio_device_endian virtio_current_cpu_endian(void)
765{
766 CPUClass *cc = CPU_GET_CLASS(current_cpu);
767
768 if (cc->virtio_is_big_endian(current_cpu)) {
769 return VIRTIO_DEVICE_ENDIAN_BIG;
770 } else {
771 return VIRTIO_DEVICE_ENDIAN_LITTLE;
772 }
773}
774
775void virtio_reset(void *opaque)
776{
777 VirtIODevice *vdev = opaque;
778 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
779 int i;
780
781 virtio_set_status(vdev, 0);
782 if (current_cpu) {
783
784 vdev->device_endian = virtio_current_cpu_endian();
785 } else {
786
787 vdev->device_endian = virtio_default_endian();
788 }
789
790 if (k->reset) {
791 k->reset(vdev);
792 }
793
794 vdev->guest_features = 0;
795 vdev->queue_sel = 0;
796 vdev->status = 0;
797 vdev->isr = 0;
798 vdev->config_vector = VIRTIO_NO_VECTOR;
799 virtio_notify_vector(vdev, vdev->config_vector);
800
801 for(i = 0; i < VIRTIO_QUEUE_MAX; i++) {
802 vdev->vq[i].vring.desc = 0;
803 vdev->vq[i].vring.avail = 0;
804 vdev->vq[i].vring.used = 0;
805 vdev->vq[i].last_avail_idx = 0;
806 vdev->vq[i].shadow_avail_idx = 0;
807 vdev->vq[i].used_idx = 0;
808 virtio_queue_set_vector(vdev, i, VIRTIO_NO_VECTOR);
809 vdev->vq[i].signalled_used = 0;
810 vdev->vq[i].signalled_used_valid = false;
811 vdev->vq[i].notification = true;
812 vdev->vq[i].vring.num = vdev->vq[i].vring.num_default;
813 }
814}
815
816uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr)
817{
818 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
819 uint8_t val;
820
821 if (addr + sizeof(val) > vdev->config_len) {
822 return (uint32_t)-1;
823 }
824
825 k->get_config(vdev, vdev->config);
826
827 val = ldub_p(vdev->config + addr);
828 return val;
829}
830
831uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr)
832{
833 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
834 uint16_t val;
835
836 if (addr + sizeof(val) > vdev->config_len) {
837 return (uint32_t)-1;
838 }
839
840 k->get_config(vdev, vdev->config);
841
842 val = lduw_p(vdev->config + addr);
843 return val;
844}
845
846uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr)
847{
848 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
849 uint32_t val;
850
851 if (addr + sizeof(val) > vdev->config_len) {
852 return (uint32_t)-1;
853 }
854
855 k->get_config(vdev, vdev->config);
856
857 val = ldl_p(vdev->config + addr);
858 return val;
859}
860
861void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data)
862{
863 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
864 uint8_t val = data;
865
866 if (addr + sizeof(val) > vdev->config_len) {
867 return;
868 }
869
870 stb_p(vdev->config + addr, val);
871
872 if (k->set_config) {
873 k->set_config(vdev, vdev->config);
874 }
875}
876
877void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data)
878{
879 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
880 uint16_t val = data;
881
882 if (addr + sizeof(val) > vdev->config_len) {
883 return;
884 }
885
886 stw_p(vdev->config + addr, val);
887
888 if (k->set_config) {
889 k->set_config(vdev, vdev->config);
890 }
891}
892
893void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data)
894{
895 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
896 uint32_t val = data;
897
898 if (addr + sizeof(val) > vdev->config_len) {
899 return;
900 }
901
902 stl_p(vdev->config + addr, val);
903
904 if (k->set_config) {
905 k->set_config(vdev, vdev->config);
906 }
907}
908
909uint32_t virtio_config_modern_readb(VirtIODevice *vdev, uint32_t addr)
910{
911 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
912 uint8_t val;
913
914 if (addr + sizeof(val) > vdev->config_len) {
915 return (uint32_t)-1;
916 }
917
918 k->get_config(vdev, vdev->config);
919
920 val = ldub_p(vdev->config + addr);
921 return val;
922}
923
924uint32_t virtio_config_modern_readw(VirtIODevice *vdev, uint32_t addr)
925{
926 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
927 uint16_t val;
928
929 if (addr + sizeof(val) > vdev->config_len) {
930 return (uint32_t)-1;
931 }
932
933 k->get_config(vdev, vdev->config);
934
935 val = lduw_le_p(vdev->config + addr);
936 return val;
937}
938
939uint32_t virtio_config_modern_readl(VirtIODevice *vdev, uint32_t addr)
940{
941 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
942 uint32_t val;
943
944 if (addr + sizeof(val) > vdev->config_len) {
945 return (uint32_t)-1;
946 }
947
948 k->get_config(vdev, vdev->config);
949
950 val = ldl_le_p(vdev->config + addr);
951 return val;
952}
953
954void virtio_config_modern_writeb(VirtIODevice *vdev,
955 uint32_t addr, uint32_t data)
956{
957 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
958 uint8_t val = data;
959
960 if (addr + sizeof(val) > vdev->config_len) {
961 return;
962 }
963
964 stb_p(vdev->config + addr, val);
965
966 if (k->set_config) {
967 k->set_config(vdev, vdev->config);
968 }
969}
970
971void virtio_config_modern_writew(VirtIODevice *vdev,
972 uint32_t addr, uint32_t data)
973{
974 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
975 uint16_t val = data;
976
977 if (addr + sizeof(val) > vdev->config_len) {
978 return;
979 }
980
981 stw_le_p(vdev->config + addr, val);
982
983 if (k->set_config) {
984 k->set_config(vdev, vdev->config);
985 }
986}
987
988void virtio_config_modern_writel(VirtIODevice *vdev,
989 uint32_t addr, uint32_t data)
990{
991 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
992 uint32_t val = data;
993
994 if (addr + sizeof(val) > vdev->config_len) {
995 return;
996 }
997
998 stl_le_p(vdev->config + addr, val);
999
1000 if (k->set_config) {
1001 k->set_config(vdev, vdev->config);
1002 }
1003}
1004
1005void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr)
1006{
1007 vdev->vq[n].vring.desc = addr;
1008 virtio_queue_update_rings(vdev, n);
1009}
1010
1011hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n)
1012{
1013 return vdev->vq[n].vring.desc;
1014}
1015
1016void virtio_queue_set_rings(VirtIODevice *vdev, int n, hwaddr desc,
1017 hwaddr avail, hwaddr used)
1018{
1019 vdev->vq[n].vring.desc = desc;
1020 vdev->vq[n].vring.avail = avail;
1021 vdev->vq[n].vring.used = used;
1022}
1023
1024void virtio_queue_set_num(VirtIODevice *vdev, int n, int num)
1025{
1026
1027
1028
1029 if (!!num != !!vdev->vq[n].vring.num ||
1030 num > VIRTQUEUE_MAX_SIZE ||
1031 num < 0) {
1032 return;
1033 }
1034 vdev->vq[n].vring.num = num;
1035}
1036
1037VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector)
1038{
1039 return QLIST_FIRST(&vdev->vector_queues[vector]);
1040}
1041
1042VirtQueue *virtio_vector_next_queue(VirtQueue *vq)
1043{
1044 return QLIST_NEXT(vq, node);
1045}
1046
1047int virtio_queue_get_num(VirtIODevice *vdev, int n)
1048{
1049 return vdev->vq[n].vring.num;
1050}
1051
1052int virtio_get_num_queues(VirtIODevice *vdev)
1053{
1054 int i;
1055
1056 for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
1057 if (!virtio_queue_get_num(vdev, i)) {
1058 break;
1059 }
1060 }
1061
1062 return i;
1063}
1064
1065int virtio_queue_get_id(VirtQueue *vq)
1066{
1067 VirtIODevice *vdev = vq->vdev;
1068 assert(vq >= &vdev->vq[0] && vq < &vdev->vq[VIRTIO_QUEUE_MAX]);
1069 return vq - &vdev->vq[0];
1070}
1071
1072void virtio_queue_set_align(VirtIODevice *vdev, int n, int align)
1073{
1074 BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
1075 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
1076
1077
1078 if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) {
1079 error_report("tried to modify queue alignment for virtio-1 device");
1080 return;
1081 }
1082
1083
1084
1085
1086 assert(k->has_variable_vring_alignment);
1087
1088 vdev->vq[n].vring.align = align;
1089 virtio_queue_update_rings(vdev, n);
1090}
1091
1092static void virtio_queue_notify_aio_vq(VirtQueue *vq)
1093{
1094 if (vq->vring.desc && vq->handle_aio_output) {
1095 VirtIODevice *vdev = vq->vdev;
1096
1097 trace_virtio_queue_notify(vdev, vq - vdev->vq, vq);
1098 vq->handle_aio_output(vdev, vq);
1099 }
1100}
1101
1102static void virtio_queue_notify_vq(VirtQueue *vq)
1103{
1104 if (vq->vring.desc && vq->handle_output) {
1105 VirtIODevice *vdev = vq->vdev;
1106
1107 trace_virtio_queue_notify(vdev, vq - vdev->vq, vq);
1108 vq->handle_output(vdev, vq);
1109 }
1110}
1111
1112void virtio_queue_notify(VirtIODevice *vdev, int n)
1113{
1114 virtio_queue_notify_vq(&vdev->vq[n]);
1115}
1116
1117uint16_t virtio_queue_vector(VirtIODevice *vdev, int n)
1118{
1119 return n < VIRTIO_QUEUE_MAX ? vdev->vq[n].vector :
1120 VIRTIO_NO_VECTOR;
1121}
1122
1123void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector)
1124{
1125 VirtQueue *vq = &vdev->vq[n];
1126
1127 if (n < VIRTIO_QUEUE_MAX) {
1128 if (vdev->vector_queues &&
1129 vdev->vq[n].vector != VIRTIO_NO_VECTOR) {
1130 QLIST_REMOVE(vq, node);
1131 }
1132 vdev->vq[n].vector = vector;
1133 if (vdev->vector_queues &&
1134 vector != VIRTIO_NO_VECTOR) {
1135 QLIST_INSERT_HEAD(&vdev->vector_queues[vector], vq, node);
1136 }
1137 }
1138}
1139
1140VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
1141 void (*handle_output)(VirtIODevice *, VirtQueue *))
1142{
1143 int i;
1144
1145 for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
1146 if (vdev->vq[i].vring.num == 0)
1147 break;
1148 }
1149
1150 if (i == VIRTIO_QUEUE_MAX || queue_size > VIRTQUEUE_MAX_SIZE)
1151 abort();
1152
1153 vdev->vq[i].vring.num = queue_size;
1154 vdev->vq[i].vring.num_default = queue_size;
1155 vdev->vq[i].vring.align = VIRTIO_PCI_VRING_ALIGN;
1156 vdev->vq[i].handle_output = handle_output;
1157 vdev->vq[i].handle_aio_output = NULL;
1158
1159 return &vdev->vq[i];
1160}
1161
1162void virtio_del_queue(VirtIODevice *vdev, int n)
1163{
1164 if (n < 0 || n >= VIRTIO_QUEUE_MAX) {
1165 abort();
1166 }
1167
1168 vdev->vq[n].vring.num = 0;
1169 vdev->vq[n].vring.num_default = 0;
1170}
1171
1172void virtio_irq(VirtQueue *vq)
1173{
1174 trace_virtio_irq(vq);
1175 vq->vdev->isr |= 0x01;
1176 virtio_notify_vector(vq->vdev, vq->vector);
1177}
1178
1179bool virtio_should_notify(VirtIODevice *vdev, VirtQueue *vq)
1180{
1181 uint16_t old, new;
1182 bool v;
1183
1184 smp_mb();
1185
1186 if (virtio_vdev_has_feature(vdev, VIRTIO_F_NOTIFY_ON_EMPTY) &&
1187 !vq->inuse && virtio_queue_empty(vq)) {
1188 return true;
1189 }
1190
1191 if (!virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) {
1192 return !(vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT);
1193 }
1194
1195 v = vq->signalled_used_valid;
1196 vq->signalled_used_valid = true;
1197 old = vq->signalled_used;
1198 new = vq->signalled_used = vq->used_idx;
1199 return !v || vring_need_event(vring_get_used_event(vq), new, old);
1200}
1201
1202void virtio_notify(VirtIODevice *vdev, VirtQueue *vq)
1203{
1204 if (!virtio_should_notify(vdev, vq)) {
1205 return;
1206 }
1207
1208 trace_virtio_notify(vdev, vq);
1209 vdev->isr |= 0x01;
1210 virtio_notify_vector(vdev, vq->vector);
1211}
1212
1213void virtio_notify_config(VirtIODevice *vdev)
1214{
1215 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))
1216 return;
1217
1218 vdev->isr |= 0x03;
1219 vdev->generation++;
1220 virtio_notify_vector(vdev, vdev->config_vector);
1221}
1222
1223static bool virtio_device_endian_needed(void *opaque)
1224{
1225 VirtIODevice *vdev = opaque;
1226
1227 assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN);
1228 if (!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) {
1229 return vdev->device_endian != virtio_default_endian();
1230 }
1231
1232 return vdev->device_endian != VIRTIO_DEVICE_ENDIAN_LITTLE;
1233}
1234
1235static bool virtio_64bit_features_needed(void *opaque)
1236{
1237 VirtIODevice *vdev = opaque;
1238
1239 return (vdev->host_features >> 32) != 0;
1240}
1241
1242static bool virtio_virtqueue_needed(void *opaque)
1243{
1244 VirtIODevice *vdev = opaque;
1245
1246 return virtio_host_has_feature(vdev, VIRTIO_F_VERSION_1);
1247}
1248
1249static bool virtio_ringsize_needed(void *opaque)
1250{
1251 VirtIODevice *vdev = opaque;
1252 int i;
1253
1254 for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
1255 if (vdev->vq[i].vring.num != vdev->vq[i].vring.num_default) {
1256 return true;
1257 }
1258 }
1259 return false;
1260}
1261
1262static bool virtio_extra_state_needed(void *opaque)
1263{
1264 VirtIODevice *vdev = opaque;
1265 BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
1266 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
1267
1268 return k->has_extra_state &&
1269 k->has_extra_state(qbus->parent);
1270}
1271
1272static const VMStateDescription vmstate_virtqueue = {
1273 .name = "virtqueue_state",
1274 .version_id = 1,
1275 .minimum_version_id = 1,
1276 .fields = (VMStateField[]) {
1277 VMSTATE_UINT64(vring.avail, struct VirtQueue),
1278 VMSTATE_UINT64(vring.used, struct VirtQueue),
1279 VMSTATE_END_OF_LIST()
1280 }
1281};
1282
1283static const VMStateDescription vmstate_virtio_virtqueues = {
1284 .name = "virtio/virtqueues",
1285 .version_id = 1,
1286 .minimum_version_id = 1,
1287 .needed = &virtio_virtqueue_needed,
1288 .fields = (VMStateField[]) {
1289 VMSTATE_STRUCT_VARRAY_POINTER_KNOWN(vq, struct VirtIODevice,
1290 VIRTIO_QUEUE_MAX, 0, vmstate_virtqueue, VirtQueue),
1291 VMSTATE_END_OF_LIST()
1292 }
1293};
1294
1295static const VMStateDescription vmstate_ringsize = {
1296 .name = "ringsize_state",
1297 .version_id = 1,
1298 .minimum_version_id = 1,
1299 .fields = (VMStateField[]) {
1300 VMSTATE_UINT32(vring.num_default, struct VirtQueue),
1301 VMSTATE_END_OF_LIST()
1302 }
1303};
1304
1305static const VMStateDescription vmstate_virtio_ringsize = {
1306 .name = "virtio/ringsize",
1307 .version_id = 1,
1308 .minimum_version_id = 1,
1309 .needed = &virtio_ringsize_needed,
1310 .fields = (VMStateField[]) {
1311 VMSTATE_STRUCT_VARRAY_POINTER_KNOWN(vq, struct VirtIODevice,
1312 VIRTIO_QUEUE_MAX, 0, vmstate_ringsize, VirtQueue),
1313 VMSTATE_END_OF_LIST()
1314 }
1315};
1316
1317static int get_extra_state(QEMUFile *f, void *pv, size_t size)
1318{
1319 VirtIODevice *vdev = pv;
1320 BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
1321 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
1322
1323 if (!k->load_extra_state) {
1324 return -1;
1325 } else {
1326 return k->load_extra_state(qbus->parent, f);
1327 }
1328}
1329
1330static void put_extra_state(QEMUFile *f, void *pv, size_t size)
1331{
1332 VirtIODevice *vdev = pv;
1333 BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
1334 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
1335
1336 k->save_extra_state(qbus->parent, f);
1337}
1338
1339static const VMStateInfo vmstate_info_extra_state = {
1340 .name = "virtqueue_extra_state",
1341 .get = get_extra_state,
1342 .put = put_extra_state,
1343};
1344
1345static const VMStateDescription vmstate_virtio_extra_state = {
1346 .name = "virtio/extra_state",
1347 .version_id = 1,
1348 .minimum_version_id = 1,
1349 .needed = &virtio_extra_state_needed,
1350 .fields = (VMStateField[]) {
1351 {
1352 .name = "extra_state",
1353 .version_id = 0,
1354 .field_exists = NULL,
1355 .size = 0,
1356 .info = &vmstate_info_extra_state,
1357 .flags = VMS_SINGLE,
1358 .offset = 0,
1359 },
1360 VMSTATE_END_OF_LIST()
1361 }
1362};
1363
1364static const VMStateDescription vmstate_virtio_device_endian = {
1365 .name = "virtio/device_endian",
1366 .version_id = 1,
1367 .minimum_version_id = 1,
1368 .needed = &virtio_device_endian_needed,
1369 .fields = (VMStateField[]) {
1370 VMSTATE_UINT8(device_endian, VirtIODevice),
1371 VMSTATE_END_OF_LIST()
1372 }
1373};
1374
1375static const VMStateDescription vmstate_virtio_64bit_features = {
1376 .name = "virtio/64bit_features",
1377 .version_id = 1,
1378 .minimum_version_id = 1,
1379 .needed = &virtio_64bit_features_needed,
1380 .fields = (VMStateField[]) {
1381 VMSTATE_UINT64(guest_features, VirtIODevice),
1382 VMSTATE_END_OF_LIST()
1383 }
1384};
1385
1386static const VMStateDescription vmstate_virtio = {
1387 .name = "virtio",
1388 .version_id = 1,
1389 .minimum_version_id = 1,
1390 .minimum_version_id_old = 1,
1391 .fields = (VMStateField[]) {
1392 VMSTATE_END_OF_LIST()
1393 },
1394 .subsections = (const VMStateDescription*[]) {
1395 &vmstate_virtio_device_endian,
1396 &vmstate_virtio_64bit_features,
1397 &vmstate_virtio_virtqueues,
1398 &vmstate_virtio_ringsize,
1399 &vmstate_virtio_extra_state,
1400 NULL
1401 }
1402};
1403
1404void virtio_save(VirtIODevice *vdev, QEMUFile *f)
1405{
1406 BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
1407 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
1408 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
1409 uint32_t guest_features_lo = (vdev->guest_features & 0xffffffff);
1410 int i;
1411
1412 if (k->save_config) {
1413 k->save_config(qbus->parent, f);
1414 }
1415
1416 qemu_put_8s(f, &vdev->status);
1417 qemu_put_8s(f, &vdev->isr);
1418 qemu_put_be16s(f, &vdev->queue_sel);
1419 qemu_put_be32s(f, &guest_features_lo);
1420 qemu_put_be32(f, vdev->config_len);
1421 qemu_put_buffer(f, vdev->config, vdev->config_len);
1422
1423 for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
1424 if (vdev->vq[i].vring.num == 0)
1425 break;
1426 }
1427
1428 qemu_put_be32(f, i);
1429
1430 for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
1431 if (vdev->vq[i].vring.num == 0)
1432 break;
1433
1434 qemu_put_be32(f, vdev->vq[i].vring.num);
1435 if (k->has_variable_vring_alignment) {
1436 qemu_put_be32(f, vdev->vq[i].vring.align);
1437 }
1438
1439 qemu_put_be64(f, vdev->vq[i].vring.desc);
1440 qemu_put_be16s(f, &vdev->vq[i].last_avail_idx);
1441 if (k->save_queue) {
1442 k->save_queue(qbus->parent, i, f);
1443 }
1444 }
1445
1446 if (vdc->save != NULL) {
1447 vdc->save(vdev, f);
1448 }
1449
1450
1451 vmstate_save_state(f, &vmstate_virtio, vdev, NULL);
1452}
1453
1454static int virtio_set_features_nocheck(VirtIODevice *vdev, uint64_t val)
1455{
1456 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
1457 bool bad = (val & ~(vdev->host_features)) != 0;
1458
1459 val &= vdev->host_features;
1460 if (k->set_features) {
1461 k->set_features(vdev, val);
1462 }
1463 vdev->guest_features = val;
1464 return bad ? -1 : 0;
1465}
1466
1467int virtio_set_features(VirtIODevice *vdev, uint64_t val)
1468{
1469
1470
1471
1472
1473 if (vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) {
1474 return -EINVAL;
1475 }
1476 return virtio_set_features_nocheck(vdev, val);
1477}
1478
1479int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id)
1480{
1481 int i, ret;
1482 int32_t config_len;
1483 uint32_t num;
1484 uint32_t features;
1485 BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
1486 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
1487 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
1488
1489
1490
1491
1492
1493 vdev->device_endian = VIRTIO_DEVICE_ENDIAN_UNKNOWN;
1494
1495 if (k->load_config) {
1496 ret = k->load_config(qbus->parent, f);
1497 if (ret)
1498 return ret;
1499 }
1500
1501 qemu_get_8s(f, &vdev->status);
1502 qemu_get_8s(f, &vdev->isr);
1503 qemu_get_be16s(f, &vdev->queue_sel);
1504 if (vdev->queue_sel >= VIRTIO_QUEUE_MAX) {
1505 return -1;
1506 }
1507 qemu_get_be32s(f, &features);
1508
1509 config_len = qemu_get_be32(f);
1510
1511
1512
1513
1514
1515
1516 qemu_get_buffer(f, vdev->config, MIN(config_len, vdev->config_len));
1517
1518 while (config_len > vdev->config_len) {
1519 qemu_get_byte(f);
1520 config_len--;
1521 }
1522
1523 num = qemu_get_be32(f);
1524
1525 if (num > VIRTIO_QUEUE_MAX) {
1526 error_report("Invalid number of virtqueues: 0x%x", num);
1527 return -1;
1528 }
1529
1530 for (i = 0; i < num; i++) {
1531 vdev->vq[i].vring.num = qemu_get_be32(f);
1532 if (k->has_variable_vring_alignment) {
1533 vdev->vq[i].vring.align = qemu_get_be32(f);
1534 }
1535 vdev->vq[i].vring.desc = qemu_get_be64(f);
1536 qemu_get_be16s(f, &vdev->vq[i].last_avail_idx);
1537 vdev->vq[i].signalled_used_valid = false;
1538 vdev->vq[i].notification = true;
1539
1540 if (vdev->vq[i].vring.desc) {
1541
1542 virtio_queue_update_rings(vdev, i);
1543 } else if (vdev->vq[i].last_avail_idx) {
1544 error_report("VQ %d address 0x0 "
1545 "inconsistent with Host index 0x%x",
1546 i, vdev->vq[i].last_avail_idx);
1547 return -1;
1548 }
1549 if (k->load_queue) {
1550 ret = k->load_queue(qbus->parent, i, f);
1551 if (ret)
1552 return ret;
1553 }
1554 }
1555
1556 virtio_notify_vector(vdev, VIRTIO_NO_VECTOR);
1557
1558 if (vdc->load != NULL) {
1559 ret = vdc->load(vdev, f, version_id);
1560 if (ret) {
1561 return ret;
1562 }
1563 }
1564
1565
1566 ret = vmstate_load_state(f, &vmstate_virtio, vdev, 1);
1567 if (ret) {
1568 return ret;
1569 }
1570
1571 if (vdev->device_endian == VIRTIO_DEVICE_ENDIAN_UNKNOWN) {
1572 vdev->device_endian = virtio_default_endian();
1573 }
1574
1575 if (virtio_64bit_features_needed(vdev)) {
1576
1577
1578
1579
1580
1581 uint64_t features64 = vdev->guest_features;
1582 if (virtio_set_features_nocheck(vdev, features64) < 0) {
1583 error_report("Features 0x%" PRIx64 " unsupported. "
1584 "Allowed features: 0x%" PRIx64,
1585 features64, vdev->host_features);
1586 return -1;
1587 }
1588 } else {
1589 if (virtio_set_features_nocheck(vdev, features) < 0) {
1590 error_report("Features 0x%x unsupported. "
1591 "Allowed features: 0x%" PRIx64,
1592 features, vdev->host_features);
1593 return -1;
1594 }
1595 }
1596
1597 for (i = 0; i < num; i++) {
1598 if (vdev->vq[i].vring.desc) {
1599 uint16_t nheads;
1600 nheads = vring_avail_idx(&vdev->vq[i]) - vdev->vq[i].last_avail_idx;
1601
1602 if (nheads > vdev->vq[i].vring.num) {
1603 error_report("VQ %d size 0x%x Guest index 0x%x "
1604 "inconsistent with Host index 0x%x: delta 0x%x",
1605 i, vdev->vq[i].vring.num,
1606 vring_avail_idx(&vdev->vq[i]),
1607 vdev->vq[i].last_avail_idx, nheads);
1608 return -1;
1609 }
1610 vdev->vq[i].used_idx = vring_used_idx(&vdev->vq[i]);
1611 vdev->vq[i].shadow_avail_idx = vring_avail_idx(&vdev->vq[i]);
1612 }
1613 }
1614
1615 return 0;
1616}
1617
1618void virtio_cleanup(VirtIODevice *vdev)
1619{
1620 qemu_del_vm_change_state_handler(vdev->vmstate);
1621 g_free(vdev->config);
1622 g_free(vdev->vq);
1623 g_free(vdev->vector_queues);
1624}
1625
1626static void virtio_vmstate_change(void *opaque, int running, RunState state)
1627{
1628 VirtIODevice *vdev = opaque;
1629 BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
1630 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
1631 bool backend_run = running && (vdev->status & VIRTIO_CONFIG_S_DRIVER_OK);
1632 vdev->vm_running = running;
1633
1634 if (backend_run) {
1635 virtio_set_status(vdev, vdev->status);
1636 }
1637
1638 if (k->vmstate_change) {
1639 k->vmstate_change(qbus->parent, backend_run);
1640 }
1641
1642 if (!backend_run) {
1643 virtio_set_status(vdev, vdev->status);
1644 }
1645}
1646
1647void virtio_instance_init_common(Object *proxy_obj, void *data,
1648 size_t vdev_size, const char *vdev_name)
1649{
1650 DeviceState *vdev = data;
1651
1652 object_initialize(vdev, vdev_size, vdev_name);
1653 object_property_add_child(proxy_obj, "virtio-backend", OBJECT(vdev), NULL);
1654 object_unref(OBJECT(vdev));
1655 qdev_alias_all_properties(vdev, proxy_obj);
1656}
1657
1658void virtio_init(VirtIODevice *vdev, const char *name,
1659 uint16_t device_id, size_t config_size)
1660{
1661 BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
1662 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
1663 int i;
1664 int nvectors = k->query_nvectors ? k->query_nvectors(qbus->parent) : 0;
1665
1666 if (nvectors) {
1667 vdev->vector_queues =
1668 g_malloc0(sizeof(*vdev->vector_queues) * nvectors);
1669 }
1670
1671 vdev->device_id = device_id;
1672 vdev->status = 0;
1673 vdev->isr = 0;
1674 vdev->queue_sel = 0;
1675 vdev->config_vector = VIRTIO_NO_VECTOR;
1676 vdev->vq = g_malloc0(sizeof(VirtQueue) * VIRTIO_QUEUE_MAX);
1677 vdev->vm_running = runstate_is_running();
1678 for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
1679 vdev->vq[i].vector = VIRTIO_NO_VECTOR;
1680 vdev->vq[i].vdev = vdev;
1681 vdev->vq[i].queue_index = i;
1682 }
1683
1684 vdev->name = name;
1685 vdev->config_len = config_size;
1686 if (vdev->config_len) {
1687 vdev->config = g_malloc0(config_size);
1688 } else {
1689 vdev->config = NULL;
1690 }
1691 vdev->vmstate = qemu_add_vm_change_state_handler(virtio_vmstate_change,
1692 vdev);
1693 vdev->device_endian = virtio_default_endian();
1694 vdev->use_guest_notifier_mask = true;
1695}
1696
1697hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n)
1698{
1699 return vdev->vq[n].vring.desc;
1700}
1701
1702hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n)
1703{
1704 return vdev->vq[n].vring.avail;
1705}
1706
1707hwaddr virtio_queue_get_used_addr(VirtIODevice *vdev, int n)
1708{
1709 return vdev->vq[n].vring.used;
1710}
1711
1712hwaddr virtio_queue_get_ring_addr(VirtIODevice *vdev, int n)
1713{
1714 return vdev->vq[n].vring.desc;
1715}
1716
1717hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n)
1718{
1719 return sizeof(VRingDesc) * vdev->vq[n].vring.num;
1720}
1721
1722hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n)
1723{
1724 return offsetof(VRingAvail, ring) +
1725 sizeof(uint16_t) * vdev->vq[n].vring.num;
1726}
1727
1728hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n)
1729{
1730 return offsetof(VRingUsed, ring) +
1731 sizeof(VRingUsedElem) * vdev->vq[n].vring.num;
1732}
1733
1734hwaddr virtio_queue_get_ring_size(VirtIODevice *vdev, int n)
1735{
1736 return vdev->vq[n].vring.used - vdev->vq[n].vring.desc +
1737 virtio_queue_get_used_size(vdev, n);
1738}
1739
1740uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n)
1741{
1742 return vdev->vq[n].last_avail_idx;
1743}
1744
1745void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx)
1746{
1747 vdev->vq[n].last_avail_idx = idx;
1748 vdev->vq[n].shadow_avail_idx = idx;
1749}
1750
1751void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n)
1752{
1753 vdev->vq[n].signalled_used_valid = false;
1754}
1755
1756VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n)
1757{
1758 return vdev->vq + n;
1759}
1760
1761uint16_t virtio_get_queue_index(VirtQueue *vq)
1762{
1763 return vq->queue_index;
1764}
1765
1766static void virtio_queue_guest_notifier_read(EventNotifier *n)
1767{
1768 VirtQueue *vq = container_of(n, VirtQueue, guest_notifier);
1769 if (event_notifier_test_and_clear(n)) {
1770 virtio_irq(vq);
1771 }
1772}
1773
1774void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign,
1775 bool with_irqfd)
1776{
1777 if (assign && !with_irqfd) {
1778 event_notifier_set_handler(&vq->guest_notifier, false,
1779 virtio_queue_guest_notifier_read);
1780 } else {
1781 event_notifier_set_handler(&vq->guest_notifier, false, NULL);
1782 }
1783 if (!assign) {
1784
1785
1786 virtio_queue_guest_notifier_read(&vq->guest_notifier);
1787 }
1788}
1789
1790EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq)
1791{
1792 return &vq->guest_notifier;
1793}
1794
1795static void virtio_queue_host_notifier_aio_read(EventNotifier *n)
1796{
1797 VirtQueue *vq = container_of(n, VirtQueue, host_notifier);
1798 if (event_notifier_test_and_clear(n)) {
1799 virtio_queue_notify_aio_vq(vq);
1800 }
1801}
1802
1803void virtio_queue_aio_set_host_notifier_handler(VirtQueue *vq, AioContext *ctx,
1804 void (*handle_output)(VirtIODevice *,
1805 VirtQueue *))
1806{
1807 if (handle_output) {
1808 vq->handle_aio_output = handle_output;
1809 aio_set_event_notifier(ctx, &vq->host_notifier, true,
1810 virtio_queue_host_notifier_aio_read);
1811 } else {
1812 aio_set_event_notifier(ctx, &vq->host_notifier, true, NULL);
1813
1814
1815 virtio_queue_host_notifier_aio_read(&vq->host_notifier);
1816 vq->handle_aio_output = NULL;
1817 }
1818}
1819
1820static void virtio_queue_host_notifier_read(EventNotifier *n)
1821{
1822 VirtQueue *vq = container_of(n, VirtQueue, host_notifier);
1823 if (event_notifier_test_and_clear(n)) {
1824 virtio_queue_notify_vq(vq);
1825 }
1826}
1827
1828void virtio_queue_set_host_notifier_fd_handler(VirtQueue *vq, bool assign,
1829 bool set_handler)
1830{
1831 if (assign && set_handler) {
1832 event_notifier_set_handler(&vq->host_notifier, true,
1833 virtio_queue_host_notifier_read);
1834 } else {
1835 event_notifier_set_handler(&vq->host_notifier, true, NULL);
1836 }
1837 if (!assign) {
1838
1839
1840 virtio_queue_host_notifier_read(&vq->host_notifier);
1841 }
1842}
1843
1844EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq)
1845{
1846 return &vq->host_notifier;
1847}
1848
1849void virtio_device_set_child_bus_name(VirtIODevice *vdev, char *bus_name)
1850{
1851 g_free(vdev->bus_name);
1852 vdev->bus_name = g_strdup(bus_name);
1853}
1854
1855static void virtio_device_realize(DeviceState *dev, Error **errp)
1856{
1857 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
1858 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev);
1859 Error *err = NULL;
1860
1861 if (vdc->realize != NULL) {
1862 vdc->realize(dev, &err);
1863 if (err != NULL) {
1864 error_propagate(errp, err);
1865 return;
1866 }
1867 }
1868
1869 virtio_bus_device_plugged(vdev, &err);
1870 if (err != NULL) {
1871 error_propagate(errp, err);
1872 return;
1873 }
1874}
1875
1876static void virtio_device_unrealize(DeviceState *dev, Error **errp)
1877{
1878 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
1879 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev);
1880 Error *err = NULL;
1881
1882 virtio_bus_device_unplugged(vdev);
1883
1884 if (vdc->unrealize != NULL) {
1885 vdc->unrealize(dev, &err);
1886 if (err != NULL) {
1887 error_propagate(errp, err);
1888 return;
1889 }
1890 }
1891
1892 g_free(vdev->bus_name);
1893 vdev->bus_name = NULL;
1894}
1895
1896static Property virtio_properties[] = {
1897 DEFINE_VIRTIO_COMMON_FEATURES(VirtIODevice, host_features),
1898 DEFINE_PROP_END_OF_LIST(),
1899};
1900
1901static void virtio_device_class_init(ObjectClass *klass, void *data)
1902{
1903
1904 DeviceClass *dc = DEVICE_CLASS(klass);
1905
1906 dc->realize = virtio_device_realize;
1907 dc->unrealize = virtio_device_unrealize;
1908 dc->bus_type = TYPE_VIRTIO_BUS;
1909 dc->props = virtio_properties;
1910}
1911
1912static const TypeInfo virtio_device_info = {
1913 .name = TYPE_VIRTIO_DEVICE,
1914 .parent = TYPE_DEVICE,
1915 .instance_size = sizeof(VirtIODevice),
1916 .class_init = virtio_device_class_init,
1917 .abstract = true,
1918 .class_size = sizeof(VirtioDeviceClass),
1919};
1920
1921static void virtio_register_types(void)
1922{
1923 type_register_static(&virtio_device_info);
1924}
1925
1926type_init(virtio_register_types)
1927