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14#include "qemu/osdep.h"
15#include "qapi/error.h"
16#include "qemu/iov.h"
17#include "qemu/module.h"
18#include "qemu/error-report.h"
19#include "qemu/main-loop.h"
20#include "trace.h"
21#include "hw/block/block.h"
22#include "hw/qdev-properties.h"
23#include "sysemu/blockdev.h"
24#include "sysemu/sysemu.h"
25#include "sysemu/runstate.h"
26#include "hw/virtio/virtio-blk.h"
27#include "dataplane/virtio-blk.h"
28#include "scsi/constants.h"
29#ifdef __linux__
30# include <scsi/sg.h>
31#endif
32#include "hw/virtio/virtio-bus.h"
33#include "migration/qemu-file-types.h"
34#include "hw/virtio/virtio-access.h"
35
36
37#define VIRTIO_BLK_CFG_SIZE offsetof(struct virtio_blk_config, \
38 max_discard_sectors)
39
40
41
42
43static const VirtIOFeature feature_sizes[] = {
44 {.flags = 1ULL << VIRTIO_BLK_F_DISCARD,
45 .end = endof(struct virtio_blk_config, discard_sector_alignment)},
46 {.flags = 1ULL << VIRTIO_BLK_F_WRITE_ZEROES,
47 .end = endof(struct virtio_blk_config, write_zeroes_may_unmap)},
48 {}
49};
50
51static void virtio_blk_set_config_size(VirtIOBlock *s, uint64_t host_features)
52{
53 s->config_size = MAX(VIRTIO_BLK_CFG_SIZE,
54 virtio_feature_get_config_size(feature_sizes, host_features));
55
56 assert(s->config_size <= sizeof(struct virtio_blk_config));
57}
58
59static void virtio_blk_init_request(VirtIOBlock *s, VirtQueue *vq,
60 VirtIOBlockReq *req)
61{
62 req->dev = s;
63 req->vq = vq;
64 req->qiov.size = 0;
65 req->in_len = 0;
66 req->next = NULL;
67 req->mr_next = NULL;
68}
69
70static void virtio_blk_free_request(VirtIOBlockReq *req)
71{
72 g_free(req);
73}
74
75static void virtio_blk_req_complete(VirtIOBlockReq *req, unsigned char status)
76{
77 VirtIOBlock *s = req->dev;
78 VirtIODevice *vdev = VIRTIO_DEVICE(s);
79
80 trace_virtio_blk_req_complete(vdev, req, status);
81
82 stb_p(&req->in->status, status);
83 iov_discard_undo(&req->inhdr_undo);
84 iov_discard_undo(&req->outhdr_undo);
85 virtqueue_push(req->vq, &req->elem, req->in_len);
86 if (s->dataplane_started && !s->dataplane_disabled) {
87 virtio_blk_data_plane_notify(s->dataplane, req->vq);
88 } else {
89 virtio_notify(vdev, req->vq);
90 }
91}
92
93static int virtio_blk_handle_rw_error(VirtIOBlockReq *req, int error,
94 bool is_read, bool acct_failed)
95{
96 VirtIOBlock *s = req->dev;
97 BlockErrorAction action = blk_get_error_action(s->blk, is_read, error);
98
99 if (action == BLOCK_ERROR_ACTION_STOP) {
100
101
102 req->mr_next = NULL;
103 req->next = s->rq;
104 s->rq = req;
105 } else if (action == BLOCK_ERROR_ACTION_REPORT) {
106 virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR);
107 if (acct_failed) {
108 block_acct_failed(blk_get_stats(s->blk), &req->acct);
109 }
110 virtio_blk_free_request(req);
111 }
112
113 blk_error_action(s->blk, action, is_read, error);
114 return action != BLOCK_ERROR_ACTION_IGNORE;
115}
116
117static void virtio_blk_rw_complete(void *opaque, int ret)
118{
119 VirtIOBlockReq *next = opaque;
120 VirtIOBlock *s = next->dev;
121 VirtIODevice *vdev = VIRTIO_DEVICE(s);
122
123 aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
124 while (next) {
125 VirtIOBlockReq *req = next;
126 next = req->mr_next;
127 trace_virtio_blk_rw_complete(vdev, req, ret);
128
129 if (req->qiov.nalloc != -1) {
130
131
132
133 qemu_iovec_destroy(&req->qiov);
134 }
135
136 if (ret) {
137 int p = virtio_ldl_p(VIRTIO_DEVICE(s), &req->out.type);
138 bool is_read = !(p & VIRTIO_BLK_T_OUT);
139
140
141
142
143
144
145
146
147 if (virtio_blk_handle_rw_error(req, -ret, is_read, true)) {
148 continue;
149 }
150 }
151
152 virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
153 block_acct_done(blk_get_stats(s->blk), &req->acct);
154 virtio_blk_free_request(req);
155 }
156 aio_context_release(blk_get_aio_context(s->conf.conf.blk));
157}
158
159static void virtio_blk_flush_complete(void *opaque, int ret)
160{
161 VirtIOBlockReq *req = opaque;
162 VirtIOBlock *s = req->dev;
163
164 aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
165 if (ret) {
166 if (virtio_blk_handle_rw_error(req, -ret, 0, true)) {
167 goto out;
168 }
169 }
170
171 virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
172 block_acct_done(blk_get_stats(s->blk), &req->acct);
173 virtio_blk_free_request(req);
174
175out:
176 aio_context_release(blk_get_aio_context(s->conf.conf.blk));
177}
178
179static void virtio_blk_discard_write_zeroes_complete(void *opaque, int ret)
180{
181 VirtIOBlockReq *req = opaque;
182 VirtIOBlock *s = req->dev;
183 bool is_write_zeroes = (virtio_ldl_p(VIRTIO_DEVICE(s), &req->out.type) &
184 ~VIRTIO_BLK_T_BARRIER) == VIRTIO_BLK_T_WRITE_ZEROES;
185
186 aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
187 if (ret) {
188 if (virtio_blk_handle_rw_error(req, -ret, false, is_write_zeroes)) {
189 goto out;
190 }
191 }
192
193 virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
194 if (is_write_zeroes) {
195 block_acct_done(blk_get_stats(s->blk), &req->acct);
196 }
197 virtio_blk_free_request(req);
198
199out:
200 aio_context_release(blk_get_aio_context(s->conf.conf.blk));
201}
202
203#ifdef __linux__
204
205typedef struct {
206 VirtIOBlockReq *req;
207 struct sg_io_hdr hdr;
208} VirtIOBlockIoctlReq;
209
210static void virtio_blk_ioctl_complete(void *opaque, int status)
211{
212 VirtIOBlockIoctlReq *ioctl_req = opaque;
213 VirtIOBlockReq *req = ioctl_req->req;
214 VirtIOBlock *s = req->dev;
215 VirtIODevice *vdev = VIRTIO_DEVICE(s);
216 struct virtio_scsi_inhdr *scsi;
217 struct sg_io_hdr *hdr;
218
219 scsi = (void *)req->elem.in_sg[req->elem.in_num - 2].iov_base;
220
221 if (status) {
222 status = VIRTIO_BLK_S_UNSUPP;
223 virtio_stl_p(vdev, &scsi->errors, 255);
224 goto out;
225 }
226
227 hdr = &ioctl_req->hdr;
228
229
230
231
232
233
234
235 if (hdr->status == 0 && hdr->sb_len_wr > 0) {
236 hdr->status = CHECK_CONDITION;
237 }
238
239 virtio_stl_p(vdev, &scsi->errors,
240 hdr->status | (hdr->msg_status << 8) |
241 (hdr->host_status << 16) | (hdr->driver_status << 24));
242 virtio_stl_p(vdev, &scsi->residual, hdr->resid);
243 virtio_stl_p(vdev, &scsi->sense_len, hdr->sb_len_wr);
244 virtio_stl_p(vdev, &scsi->data_len, hdr->dxfer_len);
245
246out:
247 aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
248 virtio_blk_req_complete(req, status);
249 virtio_blk_free_request(req);
250 aio_context_release(blk_get_aio_context(s->conf.conf.blk));
251 g_free(ioctl_req);
252}
253
254#endif
255
256static VirtIOBlockReq *virtio_blk_get_request(VirtIOBlock *s, VirtQueue *vq)
257{
258 VirtIOBlockReq *req = virtqueue_pop(vq, sizeof(VirtIOBlockReq));
259
260 if (req) {
261 virtio_blk_init_request(s, vq, req);
262 }
263 return req;
264}
265
266static int virtio_blk_handle_scsi_req(VirtIOBlockReq *req)
267{
268 int status = VIRTIO_BLK_S_OK;
269 struct virtio_scsi_inhdr *scsi = NULL;
270 VirtIOBlock *blk = req->dev;
271 VirtIODevice *vdev = VIRTIO_DEVICE(blk);
272 VirtQueueElement *elem = &req->elem;
273
274#ifdef __linux__
275 int i;
276 VirtIOBlockIoctlReq *ioctl_req;
277 BlockAIOCB *acb;
278#endif
279
280
281
282
283
284
285
286
287 if (elem->out_num < 2 || elem->in_num < 3) {
288 status = VIRTIO_BLK_S_IOERR;
289 goto fail;
290 }
291
292
293
294
295
296 scsi = (void *)elem->in_sg[elem->in_num - 2].iov_base;
297
298 if (!virtio_has_feature(blk->host_features, VIRTIO_BLK_F_SCSI)) {
299 status = VIRTIO_BLK_S_UNSUPP;
300 goto fail;
301 }
302
303
304
305
306 if (elem->out_num > 2 && elem->in_num > 3) {
307 status = VIRTIO_BLK_S_UNSUPP;
308 goto fail;
309 }
310
311#ifdef __linux__
312 ioctl_req = g_new0(VirtIOBlockIoctlReq, 1);
313 ioctl_req->req = req;
314 ioctl_req->hdr.interface_id = 'S';
315 ioctl_req->hdr.cmd_len = elem->out_sg[1].iov_len;
316 ioctl_req->hdr.cmdp = elem->out_sg[1].iov_base;
317 ioctl_req->hdr.dxfer_len = 0;
318
319 if (elem->out_num > 2) {
320
321
322
323
324 ioctl_req->hdr.dxfer_direction = SG_DXFER_TO_DEV;
325 ioctl_req->hdr.iovec_count = elem->out_num - 2;
326
327 for (i = 0; i < ioctl_req->hdr.iovec_count; i++) {
328 ioctl_req->hdr.dxfer_len += elem->out_sg[i + 2].iov_len;
329 }
330
331 ioctl_req->hdr.dxferp = elem->out_sg + 2;
332
333 } else if (elem->in_num > 3) {
334
335
336
337
338 ioctl_req->hdr.dxfer_direction = SG_DXFER_FROM_DEV;
339 ioctl_req->hdr.iovec_count = elem->in_num - 3;
340 for (i = 0; i < ioctl_req->hdr.iovec_count; i++) {
341 ioctl_req->hdr.dxfer_len += elem->in_sg[i].iov_len;
342 }
343
344 ioctl_req->hdr.dxferp = elem->in_sg;
345 } else {
346
347
348
349 ioctl_req->hdr.dxfer_direction = SG_DXFER_NONE;
350 }
351
352 ioctl_req->hdr.sbp = elem->in_sg[elem->in_num - 3].iov_base;
353 ioctl_req->hdr.mx_sb_len = elem->in_sg[elem->in_num - 3].iov_len;
354
355 acb = blk_aio_ioctl(blk->blk, SG_IO, &ioctl_req->hdr,
356 virtio_blk_ioctl_complete, ioctl_req);
357 if (!acb) {
358 g_free(ioctl_req);
359 status = VIRTIO_BLK_S_UNSUPP;
360 goto fail;
361 }
362 return -EINPROGRESS;
363#else
364 abort();
365#endif
366
367fail:
368
369 if (scsi) {
370 virtio_stl_p(vdev, &scsi->errors, 255);
371 }
372 return status;
373}
374
375static void virtio_blk_handle_scsi(VirtIOBlockReq *req)
376{
377 int status;
378
379 status = virtio_blk_handle_scsi_req(req);
380 if (status != -EINPROGRESS) {
381 virtio_blk_req_complete(req, status);
382 virtio_blk_free_request(req);
383 }
384}
385
386static inline void submit_requests(BlockBackend *blk, MultiReqBuffer *mrb,
387 int start, int num_reqs, int niov)
388{
389 QEMUIOVector *qiov = &mrb->reqs[start]->qiov;
390 int64_t sector_num = mrb->reqs[start]->sector_num;
391 bool is_write = mrb->is_write;
392
393 if (num_reqs > 1) {
394 int i;
395 struct iovec *tmp_iov = qiov->iov;
396 int tmp_niov = qiov->niov;
397
398
399
400
401 qemu_iovec_init(qiov, niov);
402
403 for (i = 0; i < tmp_niov; i++) {
404 qemu_iovec_add(qiov, tmp_iov[i].iov_base, tmp_iov[i].iov_len);
405 }
406
407 for (i = start + 1; i < start + num_reqs; i++) {
408 qemu_iovec_concat(qiov, &mrb->reqs[i]->qiov, 0,
409 mrb->reqs[i]->qiov.size);
410 mrb->reqs[i - 1]->mr_next = mrb->reqs[i];
411 }
412
413 trace_virtio_blk_submit_multireq(VIRTIO_DEVICE(mrb->reqs[start]->dev),
414 mrb, start, num_reqs,
415 sector_num << BDRV_SECTOR_BITS,
416 qiov->size, is_write);
417 block_acct_merge_done(blk_get_stats(blk),
418 is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ,
419 num_reqs - 1);
420 }
421
422 if (is_write) {
423 blk_aio_pwritev(blk, sector_num << BDRV_SECTOR_BITS, qiov, 0,
424 virtio_blk_rw_complete, mrb->reqs[start]);
425 } else {
426 blk_aio_preadv(blk, sector_num << BDRV_SECTOR_BITS, qiov, 0,
427 virtio_blk_rw_complete, mrb->reqs[start]);
428 }
429}
430
431static int multireq_compare(const void *a, const void *b)
432{
433 const VirtIOBlockReq *req1 = *(VirtIOBlockReq **)a,
434 *req2 = *(VirtIOBlockReq **)b;
435
436
437
438
439
440 if (req1->sector_num > req2->sector_num) {
441 return 1;
442 } else if (req1->sector_num < req2->sector_num) {
443 return -1;
444 } else {
445 return 0;
446 }
447}
448
449static void virtio_blk_submit_multireq(BlockBackend *blk, MultiReqBuffer *mrb)
450{
451 int i = 0, start = 0, num_reqs = 0, niov = 0, nb_sectors = 0;
452 uint32_t max_transfer;
453 int64_t sector_num = 0;
454
455 if (mrb->num_reqs == 1) {
456 submit_requests(blk, mrb, 0, 1, -1);
457 mrb->num_reqs = 0;
458 return;
459 }
460
461 max_transfer = blk_get_max_transfer(mrb->reqs[0]->dev->blk);
462
463 qsort(mrb->reqs, mrb->num_reqs, sizeof(*mrb->reqs),
464 &multireq_compare);
465
466 for (i = 0; i < mrb->num_reqs; i++) {
467 VirtIOBlockReq *req = mrb->reqs[i];
468 if (num_reqs > 0) {
469
470
471
472
473
474
475 if (sector_num + nb_sectors != req->sector_num ||
476 niov > blk_get_max_iov(blk) - req->qiov.niov ||
477 req->qiov.size > max_transfer ||
478 nb_sectors > (max_transfer -
479 req->qiov.size) / BDRV_SECTOR_SIZE) {
480 submit_requests(blk, mrb, start, num_reqs, niov);
481 num_reqs = 0;
482 }
483 }
484
485 if (num_reqs == 0) {
486 sector_num = req->sector_num;
487 nb_sectors = niov = 0;
488 start = i;
489 }
490
491 nb_sectors += req->qiov.size / BDRV_SECTOR_SIZE;
492 niov += req->qiov.niov;
493 num_reqs++;
494 }
495
496 submit_requests(blk, mrb, start, num_reqs, niov);
497 mrb->num_reqs = 0;
498}
499
500static void virtio_blk_handle_flush(VirtIOBlockReq *req, MultiReqBuffer *mrb)
501{
502 VirtIOBlock *s = req->dev;
503
504 block_acct_start(blk_get_stats(s->blk), &req->acct, 0,
505 BLOCK_ACCT_FLUSH);
506
507
508
509
510 if (mrb->is_write && mrb->num_reqs > 0) {
511 virtio_blk_submit_multireq(s->blk, mrb);
512 }
513 blk_aio_flush(s->blk, virtio_blk_flush_complete, req);
514}
515
516static bool virtio_blk_sect_range_ok(VirtIOBlock *dev,
517 uint64_t sector, size_t size)
518{
519 uint64_t nb_sectors = size >> BDRV_SECTOR_BITS;
520 uint64_t total_sectors;
521
522 if (nb_sectors > BDRV_REQUEST_MAX_SECTORS) {
523 return false;
524 }
525 if (sector & dev->sector_mask) {
526 return false;
527 }
528 if (size % dev->conf.conf.logical_block_size) {
529 return false;
530 }
531 blk_get_geometry(dev->blk, &total_sectors);
532 if (sector > total_sectors || nb_sectors > total_sectors - sector) {
533 return false;
534 }
535 return true;
536}
537
538static uint8_t virtio_blk_handle_discard_write_zeroes(VirtIOBlockReq *req,
539 struct virtio_blk_discard_write_zeroes *dwz_hdr, bool is_write_zeroes)
540{
541 VirtIOBlock *s = req->dev;
542 VirtIODevice *vdev = VIRTIO_DEVICE(s);
543 uint64_t sector;
544 uint32_t num_sectors, flags, max_sectors;
545 uint8_t err_status;
546 int bytes;
547
548 sector = virtio_ldq_p(vdev, &dwz_hdr->sector);
549 num_sectors = virtio_ldl_p(vdev, &dwz_hdr->num_sectors);
550 flags = virtio_ldl_p(vdev, &dwz_hdr->flags);
551 max_sectors = is_write_zeroes ? s->conf.max_write_zeroes_sectors :
552 s->conf.max_discard_sectors;
553
554
555
556
557
558
559 if (unlikely(num_sectors > max_sectors)) {
560 err_status = VIRTIO_BLK_S_IOERR;
561 goto err;
562 }
563
564 bytes = num_sectors << BDRV_SECTOR_BITS;
565
566 if (unlikely(!virtio_blk_sect_range_ok(s, sector, bytes))) {
567 err_status = VIRTIO_BLK_S_IOERR;
568 goto err;
569 }
570
571
572
573
574
575 if (unlikely(flags & ~VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP)) {
576 err_status = VIRTIO_BLK_S_UNSUPP;
577 goto err;
578 }
579
580 if (is_write_zeroes) {
581 int blk_aio_flags = 0;
582
583 if (flags & VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP) {
584 blk_aio_flags |= BDRV_REQ_MAY_UNMAP;
585 }
586
587 block_acct_start(blk_get_stats(s->blk), &req->acct, bytes,
588 BLOCK_ACCT_WRITE);
589
590 blk_aio_pwrite_zeroes(s->blk, sector << BDRV_SECTOR_BITS,
591 bytes, blk_aio_flags,
592 virtio_blk_discard_write_zeroes_complete, req);
593 } else {
594
595
596
597
598 if (unlikely(flags & VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP)) {
599 err_status = VIRTIO_BLK_S_UNSUPP;
600 goto err;
601 }
602
603 blk_aio_pdiscard(s->blk, sector << BDRV_SECTOR_BITS, bytes,
604 virtio_blk_discard_write_zeroes_complete, req);
605 }
606
607 return VIRTIO_BLK_S_OK;
608
609err:
610 if (is_write_zeroes) {
611 block_acct_invalid(blk_get_stats(s->blk), BLOCK_ACCT_WRITE);
612 }
613 return err_status;
614}
615
616static int virtio_blk_handle_request(VirtIOBlockReq *req, MultiReqBuffer *mrb)
617{
618 uint32_t type;
619 struct iovec *in_iov = req->elem.in_sg;
620 struct iovec *out_iov = req->elem.out_sg;
621 unsigned in_num = req->elem.in_num;
622 unsigned out_num = req->elem.out_num;
623 VirtIOBlock *s = req->dev;
624 VirtIODevice *vdev = VIRTIO_DEVICE(s);
625
626 if (req->elem.out_num < 1 || req->elem.in_num < 1) {
627 virtio_error(vdev, "virtio-blk missing headers");
628 return -1;
629 }
630
631 if (unlikely(iov_to_buf(out_iov, out_num, 0, &req->out,
632 sizeof(req->out)) != sizeof(req->out))) {
633 virtio_error(vdev, "virtio-blk request outhdr too short");
634 return -1;
635 }
636
637 iov_discard_front_undoable(&out_iov, &out_num, sizeof(req->out),
638 &req->outhdr_undo);
639
640 if (in_iov[in_num - 1].iov_len < sizeof(struct virtio_blk_inhdr)) {
641 virtio_error(vdev, "virtio-blk request inhdr too short");
642 iov_discard_undo(&req->outhdr_undo);
643 return -1;
644 }
645
646
647 req->in_len = iov_size(in_iov, in_num);
648 req->in = (void *)in_iov[in_num - 1].iov_base
649 + in_iov[in_num - 1].iov_len
650 - sizeof(struct virtio_blk_inhdr);
651 iov_discard_back_undoable(in_iov, &in_num, sizeof(struct virtio_blk_inhdr),
652 &req->inhdr_undo);
653
654 type = virtio_ldl_p(vdev, &req->out.type);
655
656
657
658
659 switch (type & ~(VIRTIO_BLK_T_OUT | VIRTIO_BLK_T_BARRIER)) {
660 case VIRTIO_BLK_T_IN:
661 {
662 bool is_write = type & VIRTIO_BLK_T_OUT;
663 req->sector_num = virtio_ldq_p(vdev, &req->out.sector);
664
665 if (is_write) {
666 qemu_iovec_init_external(&req->qiov, out_iov, out_num);
667 trace_virtio_blk_handle_write(vdev, req, req->sector_num,
668 req->qiov.size / BDRV_SECTOR_SIZE);
669 } else {
670 qemu_iovec_init_external(&req->qiov, in_iov, in_num);
671 trace_virtio_blk_handle_read(vdev, req, req->sector_num,
672 req->qiov.size / BDRV_SECTOR_SIZE);
673 }
674
675 if (!virtio_blk_sect_range_ok(s, req->sector_num, req->qiov.size)) {
676 virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR);
677 block_acct_invalid(blk_get_stats(s->blk),
678 is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ);
679 virtio_blk_free_request(req);
680 return 0;
681 }
682
683 block_acct_start(blk_get_stats(s->blk), &req->acct, req->qiov.size,
684 is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ);
685
686
687
688 if (mrb->num_reqs > 0 && (mrb->num_reqs == VIRTIO_BLK_MAX_MERGE_REQS ||
689 is_write != mrb->is_write ||
690 !s->conf.request_merging)) {
691 virtio_blk_submit_multireq(s->blk, mrb);
692 }
693
694 assert(mrb->num_reqs < VIRTIO_BLK_MAX_MERGE_REQS);
695 mrb->reqs[mrb->num_reqs++] = req;
696 mrb->is_write = is_write;
697 break;
698 }
699 case VIRTIO_BLK_T_FLUSH:
700 virtio_blk_handle_flush(req, mrb);
701 break;
702 case VIRTIO_BLK_T_SCSI_CMD:
703 virtio_blk_handle_scsi(req);
704 break;
705 case VIRTIO_BLK_T_GET_ID:
706 {
707
708
709
710
711 const char *serial = s->conf.serial ? s->conf.serial : "";
712 size_t size = MIN(strlen(serial) + 1,
713 MIN(iov_size(in_iov, in_num),
714 VIRTIO_BLK_ID_BYTES));
715 iov_from_buf(in_iov, in_num, 0, serial, size);
716 virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
717 virtio_blk_free_request(req);
718 break;
719 }
720
721
722
723
724
725 case VIRTIO_BLK_T_DISCARD & ~VIRTIO_BLK_T_OUT:
726 case VIRTIO_BLK_T_WRITE_ZEROES & ~VIRTIO_BLK_T_OUT:
727 {
728 struct virtio_blk_discard_write_zeroes dwz_hdr;
729 size_t out_len = iov_size(out_iov, out_num);
730 bool is_write_zeroes = (type & ~VIRTIO_BLK_T_BARRIER) ==
731 VIRTIO_BLK_T_WRITE_ZEROES;
732 uint8_t err_status;
733
734
735
736
737
738 if (unlikely(!(type & VIRTIO_BLK_T_OUT) ||
739 out_len > sizeof(dwz_hdr))) {
740 virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP);
741 virtio_blk_free_request(req);
742 return 0;
743 }
744
745 if (unlikely(iov_to_buf(out_iov, out_num, 0, &dwz_hdr,
746 sizeof(dwz_hdr)) != sizeof(dwz_hdr))) {
747 iov_discard_undo(&req->inhdr_undo);
748 iov_discard_undo(&req->outhdr_undo);
749 virtio_error(vdev, "virtio-blk discard/write_zeroes header"
750 " too short");
751 return -1;
752 }
753
754 err_status = virtio_blk_handle_discard_write_zeroes(req, &dwz_hdr,
755 is_write_zeroes);
756 if (err_status != VIRTIO_BLK_S_OK) {
757 virtio_blk_req_complete(req, err_status);
758 virtio_blk_free_request(req);
759 }
760
761 break;
762 }
763 default:
764 virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP);
765 virtio_blk_free_request(req);
766 }
767 return 0;
768}
769
770bool virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq)
771{
772 VirtIOBlockReq *req;
773 MultiReqBuffer mrb = {};
774 bool suppress_notifications = virtio_queue_get_notification(vq);
775 bool progress = false;
776
777 aio_context_acquire(blk_get_aio_context(s->blk));
778 blk_io_plug(s->blk);
779
780 do {
781 if (suppress_notifications) {
782 virtio_queue_set_notification(vq, 0);
783 }
784
785 while ((req = virtio_blk_get_request(s, vq))) {
786 progress = true;
787 if (virtio_blk_handle_request(req, &mrb)) {
788 virtqueue_detach_element(req->vq, &req->elem, 0);
789 virtio_blk_free_request(req);
790 break;
791 }
792 }
793
794 if (suppress_notifications) {
795 virtio_queue_set_notification(vq, 1);
796 }
797 } while (!virtio_queue_empty(vq));
798
799 if (mrb.num_reqs) {
800 virtio_blk_submit_multireq(s->blk, &mrb);
801 }
802
803 blk_io_unplug(s->blk);
804 aio_context_release(blk_get_aio_context(s->blk));
805 return progress;
806}
807
808static void virtio_blk_handle_output_do(VirtIOBlock *s, VirtQueue *vq)
809{
810 virtio_blk_handle_vq(s, vq);
811}
812
813static void virtio_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq)
814{
815 VirtIOBlock *s = (VirtIOBlock *)vdev;
816
817 if (s->dataplane) {
818
819
820
821 virtio_device_start_ioeventfd(vdev);
822 if (!s->dataplane_disabled) {
823 return;
824 }
825 }
826 virtio_blk_handle_output_do(s, vq);
827}
828
829void virtio_blk_process_queued_requests(VirtIOBlock *s, bool is_bh)
830{
831 VirtIOBlockReq *req = s->rq;
832 MultiReqBuffer mrb = {};
833
834 s->rq = NULL;
835
836 aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
837 while (req) {
838 VirtIOBlockReq *next = req->next;
839 if (virtio_blk_handle_request(req, &mrb)) {
840
841
842
843 while (req) {
844 next = req->next;
845 virtqueue_detach_element(req->vq, &req->elem, 0);
846 virtio_blk_free_request(req);
847 req = next;
848 }
849 break;
850 }
851 req = next;
852 }
853
854 if (mrb.num_reqs) {
855 virtio_blk_submit_multireq(s->blk, &mrb);
856 }
857 if (is_bh) {
858 blk_dec_in_flight(s->conf.conf.blk);
859 }
860 aio_context_release(blk_get_aio_context(s->conf.conf.blk));
861}
862
863static void virtio_blk_dma_restart_bh(void *opaque)
864{
865 VirtIOBlock *s = opaque;
866
867 qemu_bh_delete(s->bh);
868 s->bh = NULL;
869
870 virtio_blk_process_queued_requests(s, true);
871}
872
873static void virtio_blk_dma_restart_cb(void *opaque, bool running,
874 RunState state)
875{
876 VirtIOBlock *s = opaque;
877 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(s)));
878 VirtioBusState *bus = VIRTIO_BUS(qbus);
879
880 if (!running) {
881 return;
882 }
883
884
885
886
887
888 if (!s->bh && !virtio_bus_ioeventfd_enabled(bus)) {
889 s->bh = aio_bh_new(blk_get_aio_context(s->conf.conf.blk),
890 virtio_blk_dma_restart_bh, s);
891 blk_inc_in_flight(s->conf.conf.blk);
892 qemu_bh_schedule(s->bh);
893 }
894}
895
896static void virtio_blk_reset(VirtIODevice *vdev)
897{
898 VirtIOBlock *s = VIRTIO_BLK(vdev);
899 AioContext *ctx;
900 VirtIOBlockReq *req;
901
902 ctx = blk_get_aio_context(s->blk);
903 aio_context_acquire(ctx);
904 blk_drain(s->blk);
905
906
907
908 while (s->rq) {
909 req = s->rq;
910 s->rq = req->next;
911 virtqueue_detach_element(req->vq, &req->elem, 0);
912 virtio_blk_free_request(req);
913 }
914
915 aio_context_release(ctx);
916
917 assert(!s->dataplane_started);
918 blk_set_enable_write_cache(s->blk, s->original_wce);
919}
920
921
922
923static void virtio_blk_update_config(VirtIODevice *vdev, uint8_t *config)
924{
925 VirtIOBlock *s = VIRTIO_BLK(vdev);
926 BlockConf *conf = &s->conf.conf;
927 struct virtio_blk_config blkcfg;
928 uint64_t capacity;
929 int64_t length;
930 int blk_size = conf->logical_block_size;
931
932 blk_get_geometry(s->blk, &capacity);
933 memset(&blkcfg, 0, sizeof(blkcfg));
934 virtio_stq_p(vdev, &blkcfg.capacity, capacity);
935 virtio_stl_p(vdev, &blkcfg.seg_max,
936 s->conf.seg_max_adjust ? s->conf.queue_size - 2 : 128 - 2);
937 virtio_stw_p(vdev, &blkcfg.geometry.cylinders, conf->cyls);
938 virtio_stl_p(vdev, &blkcfg.blk_size, blk_size);
939 virtio_stw_p(vdev, &blkcfg.min_io_size, conf->min_io_size / blk_size);
940 virtio_stl_p(vdev, &blkcfg.opt_io_size, conf->opt_io_size / blk_size);
941 blkcfg.geometry.heads = conf->heads;
942
943
944
945
946
947
948
949
950
951
952
953 length = blk_getlength(s->blk);
954 if (length > 0 && length / conf->heads / conf->secs % blk_size) {
955 blkcfg.geometry.sectors = conf->secs & ~s->sector_mask;
956 } else {
957 blkcfg.geometry.sectors = conf->secs;
958 }
959 blkcfg.size_max = 0;
960 blkcfg.physical_block_exp = get_physical_block_exp(conf);
961 blkcfg.alignment_offset = 0;
962 blkcfg.wce = blk_enable_write_cache(s->blk);
963 virtio_stw_p(vdev, &blkcfg.num_queues, s->conf.num_queues);
964 if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_DISCARD)) {
965 uint32_t discard_granularity = conf->discard_granularity;
966 if (discard_granularity == -1 || !s->conf.report_discard_granularity) {
967 discard_granularity = blk_size;
968 }
969 virtio_stl_p(vdev, &blkcfg.max_discard_sectors,
970 s->conf.max_discard_sectors);
971 virtio_stl_p(vdev, &blkcfg.discard_sector_alignment,
972 discard_granularity >> BDRV_SECTOR_BITS);
973
974
975
976
977
978 virtio_stl_p(vdev, &blkcfg.max_discard_seg, 1);
979 }
980 if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_WRITE_ZEROES)) {
981 virtio_stl_p(vdev, &blkcfg.max_write_zeroes_sectors,
982 s->conf.max_write_zeroes_sectors);
983 blkcfg.write_zeroes_may_unmap = 1;
984 virtio_stl_p(vdev, &blkcfg.max_write_zeroes_seg, 1);
985 }
986 memcpy(config, &blkcfg, s->config_size);
987}
988
989static void virtio_blk_set_config(VirtIODevice *vdev, const uint8_t *config)
990{
991 VirtIOBlock *s = VIRTIO_BLK(vdev);
992 struct virtio_blk_config blkcfg;
993
994 memcpy(&blkcfg, config, s->config_size);
995
996 aio_context_acquire(blk_get_aio_context(s->blk));
997 blk_set_enable_write_cache(s->blk, blkcfg.wce != 0);
998 aio_context_release(blk_get_aio_context(s->blk));
999}
1000
1001static uint64_t virtio_blk_get_features(VirtIODevice *vdev, uint64_t features,
1002 Error **errp)
1003{
1004 VirtIOBlock *s = VIRTIO_BLK(vdev);
1005
1006
1007 features |= s->host_features;
1008
1009 virtio_add_feature(&features, VIRTIO_BLK_F_SEG_MAX);
1010 virtio_add_feature(&features, VIRTIO_BLK_F_GEOMETRY);
1011 virtio_add_feature(&features, VIRTIO_BLK_F_TOPOLOGY);
1012 virtio_add_feature(&features, VIRTIO_BLK_F_BLK_SIZE);
1013 if (virtio_has_feature(features, VIRTIO_F_VERSION_1)) {
1014 if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_SCSI)) {
1015 error_setg(errp, "Please set scsi=off for virtio-blk devices in order to use virtio 1.0");
1016 return 0;
1017 }
1018 } else {
1019 virtio_clear_feature(&features, VIRTIO_F_ANY_LAYOUT);
1020 virtio_add_feature(&features, VIRTIO_BLK_F_SCSI);
1021 }
1022
1023 if (blk_enable_write_cache(s->blk) ||
1024 (s->conf.x_enable_wce_if_config_wce &&
1025 virtio_has_feature(features, VIRTIO_BLK_F_CONFIG_WCE))) {
1026 virtio_add_feature(&features, VIRTIO_BLK_F_WCE);
1027 }
1028 if (!blk_is_writable(s->blk)) {
1029 virtio_add_feature(&features, VIRTIO_BLK_F_RO);
1030 }
1031 if (s->conf.num_queues > 1) {
1032 virtio_add_feature(&features, VIRTIO_BLK_F_MQ);
1033 }
1034
1035 return features;
1036}
1037
1038static void virtio_blk_set_status(VirtIODevice *vdev, uint8_t status)
1039{
1040 VirtIOBlock *s = VIRTIO_BLK(vdev);
1041
1042 if (!(status & (VIRTIO_CONFIG_S_DRIVER | VIRTIO_CONFIG_S_DRIVER_OK))) {
1043 assert(!s->dataplane_started);
1044 }
1045
1046 if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
1047 return;
1048 }
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065 if (!virtio_vdev_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE)) {
1066 aio_context_acquire(blk_get_aio_context(s->blk));
1067 blk_set_enable_write_cache(s->blk,
1068 virtio_vdev_has_feature(vdev,
1069 VIRTIO_BLK_F_WCE));
1070 aio_context_release(blk_get_aio_context(s->blk));
1071 }
1072}
1073
1074static void virtio_blk_save_device(VirtIODevice *vdev, QEMUFile *f)
1075{
1076 VirtIOBlock *s = VIRTIO_BLK(vdev);
1077 VirtIOBlockReq *req = s->rq;
1078
1079 while (req) {
1080 qemu_put_sbyte(f, 1);
1081
1082 if (s->conf.num_queues > 1) {
1083 qemu_put_be32(f, virtio_get_queue_index(req->vq));
1084 }
1085
1086 qemu_put_virtqueue_element(vdev, f, &req->elem);
1087 req = req->next;
1088 }
1089 qemu_put_sbyte(f, 0);
1090}
1091
1092static int virtio_blk_load_device(VirtIODevice *vdev, QEMUFile *f,
1093 int version_id)
1094{
1095 VirtIOBlock *s = VIRTIO_BLK(vdev);
1096
1097 while (qemu_get_sbyte(f)) {
1098 unsigned nvqs = s->conf.num_queues;
1099 unsigned vq_idx = 0;
1100 VirtIOBlockReq *req;
1101
1102 if (nvqs > 1) {
1103 vq_idx = qemu_get_be32(f);
1104
1105 if (vq_idx >= nvqs) {
1106 error_report("Invalid virtqueue index in request list: %#x",
1107 vq_idx);
1108 return -EINVAL;
1109 }
1110 }
1111
1112 req = qemu_get_virtqueue_element(vdev, f, sizeof(VirtIOBlockReq));
1113 virtio_blk_init_request(s, virtio_get_queue(vdev, vq_idx), req);
1114 req->next = s->rq;
1115 s->rq = req;
1116 }
1117
1118 return 0;
1119}
1120
1121static void virtio_resize_cb(void *opaque)
1122{
1123 VirtIODevice *vdev = opaque;
1124
1125 assert(qemu_get_current_aio_context() == qemu_get_aio_context());
1126 virtio_notify_config(vdev);
1127}
1128
1129static void virtio_blk_resize(void *opaque)
1130{
1131 VirtIODevice *vdev = VIRTIO_DEVICE(opaque);
1132
1133
1134
1135
1136
1137
1138 aio_bh_schedule_oneshot(qemu_get_aio_context(), virtio_resize_cb, vdev);
1139}
1140
1141static const BlockDevOps virtio_block_ops = {
1142 .resize_cb = virtio_blk_resize,
1143};
1144
1145static void virtio_blk_device_realize(DeviceState *dev, Error **errp)
1146{
1147 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
1148 VirtIOBlock *s = VIRTIO_BLK(dev);
1149 VirtIOBlkConf *conf = &s->conf;
1150 Error *err = NULL;
1151 unsigned i;
1152
1153 if (!conf->conf.blk) {
1154 error_setg(errp, "drive property not set");
1155 return;
1156 }
1157 if (!blk_is_inserted(conf->conf.blk)) {
1158 error_setg(errp, "Device needs media, but drive is empty");
1159 return;
1160 }
1161 if (conf->num_queues == VIRTIO_BLK_AUTO_NUM_QUEUES) {
1162 conf->num_queues = 1;
1163 }
1164 if (!conf->num_queues) {
1165 error_setg(errp, "num-queues property must be larger than 0");
1166 return;
1167 }
1168 if (conf->queue_size <= 2) {
1169 error_setg(errp, "invalid queue-size property (%" PRIu16 "), "
1170 "must be > 2", conf->queue_size);
1171 return;
1172 }
1173 if (!is_power_of_2(conf->queue_size) ||
1174 conf->queue_size > VIRTQUEUE_MAX_SIZE) {
1175 error_setg(errp, "invalid queue-size property (%" PRIu16 "), "
1176 "must be a power of 2 (max %d)",
1177 conf->queue_size, VIRTQUEUE_MAX_SIZE);
1178 return;
1179 }
1180
1181 if (!blkconf_apply_backend_options(&conf->conf,
1182 !blk_supports_write_perm(conf->conf.blk),
1183 true, errp)) {
1184 return;
1185 }
1186 s->original_wce = blk_enable_write_cache(conf->conf.blk);
1187 if (!blkconf_geometry(&conf->conf, NULL, 65535, 255, 255, errp)) {
1188 return;
1189 }
1190
1191 if (!blkconf_blocksizes(&conf->conf, errp)) {
1192 return;
1193 }
1194
1195 if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_DISCARD) &&
1196 (!conf->max_discard_sectors ||
1197 conf->max_discard_sectors > BDRV_REQUEST_MAX_SECTORS)) {
1198 error_setg(errp, "invalid max-discard-sectors property (%" PRIu32 ")"
1199 ", must be between 1 and %d",
1200 conf->max_discard_sectors, (int)BDRV_REQUEST_MAX_SECTORS);
1201 return;
1202 }
1203
1204 if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_WRITE_ZEROES) &&
1205 (!conf->max_write_zeroes_sectors ||
1206 conf->max_write_zeroes_sectors > BDRV_REQUEST_MAX_SECTORS)) {
1207 error_setg(errp, "invalid max-write-zeroes-sectors property (%" PRIu32
1208 "), must be between 1 and %d",
1209 conf->max_write_zeroes_sectors,
1210 (int)BDRV_REQUEST_MAX_SECTORS);
1211 return;
1212 }
1213
1214 virtio_blk_set_config_size(s, s->host_features);
1215
1216 virtio_init(vdev, "virtio-blk", VIRTIO_ID_BLOCK, s->config_size);
1217
1218 s->blk = conf->conf.blk;
1219 s->rq = NULL;
1220 s->sector_mask = (s->conf.conf.logical_block_size / BDRV_SECTOR_SIZE) - 1;
1221
1222 for (i = 0; i < conf->num_queues; i++) {
1223 virtio_add_queue(vdev, conf->queue_size, virtio_blk_handle_output);
1224 }
1225 virtio_blk_data_plane_create(vdev, conf, &s->dataplane, &err);
1226 if (err != NULL) {
1227 error_propagate(errp, err);
1228 for (i = 0; i < conf->num_queues; i++) {
1229 virtio_del_queue(vdev, i);
1230 }
1231 virtio_cleanup(vdev);
1232 return;
1233 }
1234
1235 s->change = qemu_add_vm_change_state_handler(virtio_blk_dma_restart_cb, s);
1236 blk_set_dev_ops(s->blk, &virtio_block_ops, s);
1237 blk_set_guest_block_size(s->blk, s->conf.conf.logical_block_size);
1238
1239 blk_iostatus_enable(s->blk);
1240
1241 add_boot_device_lchs(dev, "/disk@0,0",
1242 conf->conf.lcyls,
1243 conf->conf.lheads,
1244 conf->conf.lsecs);
1245}
1246
1247static void virtio_blk_device_unrealize(DeviceState *dev)
1248{
1249 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
1250 VirtIOBlock *s = VIRTIO_BLK(dev);
1251 VirtIOBlkConf *conf = &s->conf;
1252 unsigned i;
1253
1254 blk_drain(s->blk);
1255 del_boot_device_lchs(dev, "/disk@0,0");
1256 virtio_blk_data_plane_destroy(s->dataplane);
1257 s->dataplane = NULL;
1258 for (i = 0; i < conf->num_queues; i++) {
1259 virtio_del_queue(vdev, i);
1260 }
1261 qemu_del_vm_change_state_handler(s->change);
1262 blockdev_mark_auto_del(s->blk);
1263 virtio_cleanup(vdev);
1264}
1265
1266static void virtio_blk_instance_init(Object *obj)
1267{
1268 VirtIOBlock *s = VIRTIO_BLK(obj);
1269
1270 device_add_bootindex_property(obj, &s->conf.conf.bootindex,
1271 "bootindex", "/disk@0,0",
1272 DEVICE(obj));
1273}
1274
1275static const VMStateDescription vmstate_virtio_blk = {
1276 .name = "virtio-blk",
1277 .minimum_version_id = 2,
1278 .version_id = 2,
1279 .fields = (VMStateField[]) {
1280 VMSTATE_VIRTIO_DEVICE,
1281 VMSTATE_END_OF_LIST()
1282 },
1283};
1284
1285static Property virtio_blk_properties[] = {
1286 DEFINE_BLOCK_PROPERTIES(VirtIOBlock, conf.conf),
1287 DEFINE_BLOCK_ERROR_PROPERTIES(VirtIOBlock, conf.conf),
1288 DEFINE_BLOCK_CHS_PROPERTIES(VirtIOBlock, conf.conf),
1289 DEFINE_PROP_STRING("serial", VirtIOBlock, conf.serial),
1290 DEFINE_PROP_BIT64("config-wce", VirtIOBlock, host_features,
1291 VIRTIO_BLK_F_CONFIG_WCE, true),
1292#ifdef __linux__
1293 DEFINE_PROP_BIT64("scsi", VirtIOBlock, host_features,
1294 VIRTIO_BLK_F_SCSI, false),
1295#endif
1296 DEFINE_PROP_BIT("request-merging", VirtIOBlock, conf.request_merging, 0,
1297 true),
1298 DEFINE_PROP_UINT16("num-queues", VirtIOBlock, conf.num_queues,
1299 VIRTIO_BLK_AUTO_NUM_QUEUES),
1300 DEFINE_PROP_UINT16("queue-size", VirtIOBlock, conf.queue_size, 256),
1301 DEFINE_PROP_BOOL("seg-max-adjust", VirtIOBlock, conf.seg_max_adjust, true),
1302 DEFINE_PROP_LINK("iothread", VirtIOBlock, conf.iothread, TYPE_IOTHREAD,
1303 IOThread *),
1304 DEFINE_PROP_BIT64("discard", VirtIOBlock, host_features,
1305 VIRTIO_BLK_F_DISCARD, true),
1306 DEFINE_PROP_BOOL("report-discard-granularity", VirtIOBlock,
1307 conf.report_discard_granularity, true),
1308 DEFINE_PROP_BIT64("write-zeroes", VirtIOBlock, host_features,
1309 VIRTIO_BLK_F_WRITE_ZEROES, true),
1310 DEFINE_PROP_UINT32("max-discard-sectors", VirtIOBlock,
1311 conf.max_discard_sectors, BDRV_REQUEST_MAX_SECTORS),
1312 DEFINE_PROP_UINT32("max-write-zeroes-sectors", VirtIOBlock,
1313 conf.max_write_zeroes_sectors, BDRV_REQUEST_MAX_SECTORS),
1314 DEFINE_PROP_BOOL("x-enable-wce-if-config-wce", VirtIOBlock,
1315 conf.x_enable_wce_if_config_wce, true),
1316 DEFINE_PROP_END_OF_LIST(),
1317};
1318
1319static void virtio_blk_class_init(ObjectClass *klass, void *data)
1320{
1321 DeviceClass *dc = DEVICE_CLASS(klass);
1322 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
1323
1324 device_class_set_props(dc, virtio_blk_properties);
1325 dc->vmsd = &vmstate_virtio_blk;
1326 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
1327 vdc->realize = virtio_blk_device_realize;
1328 vdc->unrealize = virtio_blk_device_unrealize;
1329 vdc->get_config = virtio_blk_update_config;
1330 vdc->set_config = virtio_blk_set_config;
1331 vdc->get_features = virtio_blk_get_features;
1332 vdc->set_status = virtio_blk_set_status;
1333 vdc->reset = virtio_blk_reset;
1334 vdc->save = virtio_blk_save_device;
1335 vdc->load = virtio_blk_load_device;
1336 vdc->start_ioeventfd = virtio_blk_data_plane_start;
1337 vdc->stop_ioeventfd = virtio_blk_data_plane_stop;
1338}
1339
1340static const TypeInfo virtio_blk_info = {
1341 .name = TYPE_VIRTIO_BLK,
1342 .parent = TYPE_VIRTIO_DEVICE,
1343 .instance_size = sizeof(VirtIOBlock),
1344 .instance_init = virtio_blk_instance_init,
1345 .class_init = virtio_blk_class_init,
1346};
1347
1348static void virtio_register_types(void)
1349{
1350 type_register_static(&virtio_blk_info);
1351}
1352
1353type_init(virtio_register_types)
1354