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14#include "qemu/osdep.h"
15#include "qapi/error.h"
16#include "qemu-common.h"
17#include "qemu/iov.h"
18#include "qemu/error-report.h"
19#include "trace.h"
20#include "hw/block/block.h"
21#include "sysemu/block-backend.h"
22#include "sysemu/blockdev.h"
23#include "hw/virtio/virtio-blk.h"
24#include "dataplane/virtio-blk.h"
25#include "block/scsi.h"
26#ifdef __linux__
27# include <scsi/sg.h>
28#endif
29#include "hw/virtio/virtio-bus.h"
30#include "hw/virtio/virtio-access.h"
31
32void virtio_blk_init_request(VirtIOBlock *s, VirtQueue *vq,
33 VirtIOBlockReq *req)
34{
35 req->dev = s;
36 req->vq = vq;
37 req->qiov.size = 0;
38 req->in_len = 0;
39 req->next = NULL;
40 req->mr_next = NULL;
41}
42
43void virtio_blk_free_request(VirtIOBlockReq *req)
44{
45 if (req) {
46 g_free(req);
47 }
48}
49
50static void virtio_blk_req_complete(VirtIOBlockReq *req, unsigned char status)
51{
52 VirtIOBlock *s = req->dev;
53 VirtIODevice *vdev = VIRTIO_DEVICE(s);
54
55 trace_virtio_blk_req_complete(req, status);
56
57 stb_p(&req->in->status, status);
58 virtqueue_push(req->vq, &req->elem, req->in_len);
59 if (s->dataplane_started && !s->dataplane_disabled) {
60 virtio_blk_data_plane_notify(s->dataplane, req->vq);
61 } else {
62 virtio_notify(vdev, req->vq);
63 }
64}
65
66static int virtio_blk_handle_rw_error(VirtIOBlockReq *req, int error,
67 bool is_read)
68{
69 BlockErrorAction action = blk_get_error_action(req->dev->blk,
70 is_read, error);
71 VirtIOBlock *s = req->dev;
72
73 if (action == BLOCK_ERROR_ACTION_STOP) {
74
75
76 req->mr_next = NULL;
77 req->next = s->rq;
78 s->rq = req;
79 } else if (action == BLOCK_ERROR_ACTION_REPORT) {
80 virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR);
81 block_acct_failed(blk_get_stats(s->blk), &req->acct);
82 virtio_blk_free_request(req);
83 }
84
85 blk_error_action(s->blk, action, is_read, error);
86 return action != BLOCK_ERROR_ACTION_IGNORE;
87}
88
89static void virtio_blk_rw_complete(void *opaque, int ret)
90{
91 VirtIOBlockReq *next = opaque;
92
93 while (next) {
94 VirtIOBlockReq *req = next;
95 next = req->mr_next;
96 trace_virtio_blk_rw_complete(req, ret);
97
98 if (req->qiov.nalloc != -1) {
99
100
101
102 qemu_iovec_destroy(&req->qiov);
103 }
104
105 if (ret) {
106 int p = virtio_ldl_p(VIRTIO_DEVICE(req->dev), &req->out.type);
107 bool is_read = !(p & VIRTIO_BLK_T_OUT);
108
109
110
111
112
113
114
115
116 if (virtio_blk_handle_rw_error(req, -ret, is_read)) {
117 continue;
118 }
119 }
120
121 virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
122 block_acct_done(blk_get_stats(req->dev->blk), &req->acct);
123 virtio_blk_free_request(req);
124 }
125}
126
127static void virtio_blk_flush_complete(void *opaque, int ret)
128{
129 VirtIOBlockReq *req = opaque;
130
131 if (ret) {
132 if (virtio_blk_handle_rw_error(req, -ret, 0)) {
133 return;
134 }
135 }
136
137 virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
138 block_acct_done(blk_get_stats(req->dev->blk), &req->acct);
139 virtio_blk_free_request(req);
140}
141
142#ifdef __linux__
143
144typedef struct {
145 VirtIOBlockReq *req;
146 struct sg_io_hdr hdr;
147} VirtIOBlockIoctlReq;
148
149static void virtio_blk_ioctl_complete(void *opaque, int status)
150{
151 VirtIOBlockIoctlReq *ioctl_req = opaque;
152 VirtIOBlockReq *req = ioctl_req->req;
153 VirtIODevice *vdev = VIRTIO_DEVICE(req->dev);
154 struct virtio_scsi_inhdr *scsi;
155 struct sg_io_hdr *hdr;
156
157 scsi = (void *)req->elem.in_sg[req->elem.in_num - 2].iov_base;
158
159 if (status) {
160 status = VIRTIO_BLK_S_UNSUPP;
161 virtio_stl_p(vdev, &scsi->errors, 255);
162 goto out;
163 }
164
165 hdr = &ioctl_req->hdr;
166
167
168
169
170
171
172
173 if (hdr->status == 0 && hdr->sb_len_wr > 0) {
174 hdr->status = CHECK_CONDITION;
175 }
176
177 virtio_stl_p(vdev, &scsi->errors,
178 hdr->status | (hdr->msg_status << 8) |
179 (hdr->host_status << 16) | (hdr->driver_status << 24));
180 virtio_stl_p(vdev, &scsi->residual, hdr->resid);
181 virtio_stl_p(vdev, &scsi->sense_len, hdr->sb_len_wr);
182 virtio_stl_p(vdev, &scsi->data_len, hdr->dxfer_len);
183
184out:
185 virtio_blk_req_complete(req, status);
186 virtio_blk_free_request(req);
187 g_free(ioctl_req);
188}
189
190#endif
191
192static VirtIOBlockReq *virtio_blk_get_request(VirtIOBlock *s, VirtQueue *vq)
193{
194 VirtIOBlockReq *req = virtqueue_pop(vq, sizeof(VirtIOBlockReq));
195
196 if (req) {
197 virtio_blk_init_request(s, vq, req);
198 }
199 return req;
200}
201
202static int virtio_blk_handle_scsi_req(VirtIOBlockReq *req)
203{
204 int status = VIRTIO_BLK_S_OK;
205 struct virtio_scsi_inhdr *scsi = NULL;
206 VirtIODevice *vdev = VIRTIO_DEVICE(req->dev);
207 VirtQueueElement *elem = &req->elem;
208 VirtIOBlock *blk = req->dev;
209
210#ifdef __linux__
211 int i;
212 VirtIOBlockIoctlReq *ioctl_req;
213 BlockAIOCB *acb;
214#endif
215
216
217
218
219
220
221
222
223 if (elem->out_num < 2 || elem->in_num < 3) {
224 status = VIRTIO_BLK_S_IOERR;
225 goto fail;
226 }
227
228
229
230
231
232 scsi = (void *)elem->in_sg[elem->in_num - 2].iov_base;
233
234 if (!blk->conf.scsi) {
235 status = VIRTIO_BLK_S_UNSUPP;
236 goto fail;
237 }
238
239
240
241
242 if (elem->out_num > 2 && elem->in_num > 3) {
243 status = VIRTIO_BLK_S_UNSUPP;
244 goto fail;
245 }
246
247#ifdef __linux__
248 ioctl_req = g_new0(VirtIOBlockIoctlReq, 1);
249 ioctl_req->req = req;
250 ioctl_req->hdr.interface_id = 'S';
251 ioctl_req->hdr.cmd_len = elem->out_sg[1].iov_len;
252 ioctl_req->hdr.cmdp = elem->out_sg[1].iov_base;
253 ioctl_req->hdr.dxfer_len = 0;
254
255 if (elem->out_num > 2) {
256
257
258
259
260 ioctl_req->hdr.dxfer_direction = SG_DXFER_TO_DEV;
261 ioctl_req->hdr.iovec_count = elem->out_num - 2;
262
263 for (i = 0; i < ioctl_req->hdr.iovec_count; i++) {
264 ioctl_req->hdr.dxfer_len += elem->out_sg[i + 2].iov_len;
265 }
266
267 ioctl_req->hdr.dxferp = elem->out_sg + 2;
268
269 } else if (elem->in_num > 3) {
270
271
272
273
274 ioctl_req->hdr.dxfer_direction = SG_DXFER_FROM_DEV;
275 ioctl_req->hdr.iovec_count = elem->in_num - 3;
276 for (i = 0; i < ioctl_req->hdr.iovec_count; i++) {
277 ioctl_req->hdr.dxfer_len += elem->in_sg[i].iov_len;
278 }
279
280 ioctl_req->hdr.dxferp = elem->in_sg;
281 } else {
282
283
284
285 ioctl_req->hdr.dxfer_direction = SG_DXFER_NONE;
286 }
287
288 ioctl_req->hdr.sbp = elem->in_sg[elem->in_num - 3].iov_base;
289 ioctl_req->hdr.mx_sb_len = elem->in_sg[elem->in_num - 3].iov_len;
290
291 acb = blk_aio_ioctl(blk->blk, SG_IO, &ioctl_req->hdr,
292 virtio_blk_ioctl_complete, ioctl_req);
293 if (!acb) {
294 g_free(ioctl_req);
295 status = VIRTIO_BLK_S_UNSUPP;
296 goto fail;
297 }
298 return -EINPROGRESS;
299#else
300 abort();
301#endif
302
303fail:
304
305 if (scsi) {
306 virtio_stl_p(vdev, &scsi->errors, 255);
307 }
308 return status;
309}
310
311static void virtio_blk_handle_scsi(VirtIOBlockReq *req)
312{
313 int status;
314
315 status = virtio_blk_handle_scsi_req(req);
316 if (status != -EINPROGRESS) {
317 virtio_blk_req_complete(req, status);
318 virtio_blk_free_request(req);
319 }
320}
321
322static inline void submit_requests(BlockBackend *blk, MultiReqBuffer *mrb,
323 int start, int num_reqs, int niov)
324{
325 QEMUIOVector *qiov = &mrb->reqs[start]->qiov;
326 int64_t sector_num = mrb->reqs[start]->sector_num;
327 bool is_write = mrb->is_write;
328
329 if (num_reqs > 1) {
330 int i;
331 struct iovec *tmp_iov = qiov->iov;
332 int tmp_niov = qiov->niov;
333
334
335
336
337 qemu_iovec_init(qiov, niov);
338
339 for (i = 0; i < tmp_niov; i++) {
340 qemu_iovec_add(qiov, tmp_iov[i].iov_base, tmp_iov[i].iov_len);
341 }
342
343 for (i = start + 1; i < start + num_reqs; i++) {
344 qemu_iovec_concat(qiov, &mrb->reqs[i]->qiov, 0,
345 mrb->reqs[i]->qiov.size);
346 mrb->reqs[i - 1]->mr_next = mrb->reqs[i];
347 }
348
349 trace_virtio_blk_submit_multireq(mrb, start, num_reqs,
350 sector_num << BDRV_SECTOR_BITS,
351 qiov->size, is_write);
352 block_acct_merge_done(blk_get_stats(blk),
353 is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ,
354 num_reqs - 1);
355 }
356
357 if (is_write) {
358 blk_aio_pwritev(blk, sector_num << BDRV_SECTOR_BITS, qiov, 0,
359 virtio_blk_rw_complete, mrb->reqs[start]);
360 } else {
361 blk_aio_preadv(blk, sector_num << BDRV_SECTOR_BITS, qiov, 0,
362 virtio_blk_rw_complete, mrb->reqs[start]);
363 }
364}
365
366static int multireq_compare(const void *a, const void *b)
367{
368 const VirtIOBlockReq *req1 = *(VirtIOBlockReq **)a,
369 *req2 = *(VirtIOBlockReq **)b;
370
371
372
373
374
375 if (req1->sector_num > req2->sector_num) {
376 return 1;
377 } else if (req1->sector_num < req2->sector_num) {
378 return -1;
379 } else {
380 return 0;
381 }
382}
383
384void virtio_blk_submit_multireq(BlockBackend *blk, MultiReqBuffer *mrb)
385{
386 int i = 0, start = 0, num_reqs = 0, niov = 0, nb_sectors = 0;
387 uint32_t max_transfer;
388 int64_t sector_num = 0;
389
390 if (mrb->num_reqs == 1) {
391 submit_requests(blk, mrb, 0, 1, -1);
392 mrb->num_reqs = 0;
393 return;
394 }
395
396 max_transfer = blk_get_max_transfer(mrb->reqs[0]->dev->blk);
397
398 qsort(mrb->reqs, mrb->num_reqs, sizeof(*mrb->reqs),
399 &multireq_compare);
400
401 for (i = 0; i < mrb->num_reqs; i++) {
402 VirtIOBlockReq *req = mrb->reqs[i];
403 if (num_reqs > 0) {
404
405
406
407
408
409
410 if (sector_num + nb_sectors != req->sector_num ||
411 niov > blk_get_max_iov(blk) - req->qiov.niov ||
412 req->qiov.size > max_transfer ||
413 nb_sectors > (max_transfer -
414 req->qiov.size) / BDRV_SECTOR_SIZE) {
415 submit_requests(blk, mrb, start, num_reqs, niov);
416 num_reqs = 0;
417 }
418 }
419
420 if (num_reqs == 0) {
421 sector_num = req->sector_num;
422 nb_sectors = niov = 0;
423 start = i;
424 }
425
426 nb_sectors += req->qiov.size / BDRV_SECTOR_SIZE;
427 niov += req->qiov.niov;
428 num_reqs++;
429 }
430
431 submit_requests(blk, mrb, start, num_reqs, niov);
432 mrb->num_reqs = 0;
433}
434
435static void virtio_blk_handle_flush(VirtIOBlockReq *req, MultiReqBuffer *mrb)
436{
437 block_acct_start(blk_get_stats(req->dev->blk), &req->acct, 0,
438 BLOCK_ACCT_FLUSH);
439
440
441
442
443 if (mrb->is_write && mrb->num_reqs > 0) {
444 virtio_blk_submit_multireq(req->dev->blk, mrb);
445 }
446 blk_aio_flush(req->dev->blk, virtio_blk_flush_complete, req);
447}
448
449static bool virtio_blk_sect_range_ok(VirtIOBlock *dev,
450 uint64_t sector, size_t size)
451{
452 uint64_t nb_sectors = size >> BDRV_SECTOR_BITS;
453 uint64_t total_sectors;
454
455 if (nb_sectors > BDRV_REQUEST_MAX_SECTORS) {
456 return false;
457 }
458 if (sector & dev->sector_mask) {
459 return false;
460 }
461 if (size % dev->conf.conf.logical_block_size) {
462 return false;
463 }
464 blk_get_geometry(dev->blk, &total_sectors);
465 if (sector > total_sectors || nb_sectors > total_sectors - sector) {
466 return false;
467 }
468 return true;
469}
470
471void virtio_blk_handle_request(VirtIOBlockReq *req, MultiReqBuffer *mrb)
472{
473 uint32_t type;
474 struct iovec *in_iov = req->elem.in_sg;
475 struct iovec *iov = req->elem.out_sg;
476 unsigned in_num = req->elem.in_num;
477 unsigned out_num = req->elem.out_num;
478
479 if (req->elem.out_num < 1 || req->elem.in_num < 1) {
480 error_report("virtio-blk missing headers");
481 exit(1);
482 }
483
484 if (unlikely(iov_to_buf(iov, out_num, 0, &req->out,
485 sizeof(req->out)) != sizeof(req->out))) {
486 error_report("virtio-blk request outhdr too short");
487 exit(1);
488 }
489
490 iov_discard_front(&iov, &out_num, sizeof(req->out));
491
492 if (in_iov[in_num - 1].iov_len < sizeof(struct virtio_blk_inhdr)) {
493 error_report("virtio-blk request inhdr too short");
494 exit(1);
495 }
496
497
498 req->in_len = iov_size(in_iov, in_num);
499 req->in = (void *)in_iov[in_num - 1].iov_base
500 + in_iov[in_num - 1].iov_len
501 - sizeof(struct virtio_blk_inhdr);
502 iov_discard_back(in_iov, &in_num, sizeof(struct virtio_blk_inhdr));
503
504 type = virtio_ldl_p(VIRTIO_DEVICE(req->dev), &req->out.type);
505
506
507
508
509 switch (type & ~(VIRTIO_BLK_T_OUT | VIRTIO_BLK_T_BARRIER)) {
510 case VIRTIO_BLK_T_IN:
511 {
512 bool is_write = type & VIRTIO_BLK_T_OUT;
513 req->sector_num = virtio_ldq_p(VIRTIO_DEVICE(req->dev),
514 &req->out.sector);
515
516 if (is_write) {
517 qemu_iovec_init_external(&req->qiov, iov, out_num);
518 trace_virtio_blk_handle_write(req, req->sector_num,
519 req->qiov.size / BDRV_SECTOR_SIZE);
520 } else {
521 qemu_iovec_init_external(&req->qiov, in_iov, in_num);
522 trace_virtio_blk_handle_read(req, req->sector_num,
523 req->qiov.size / BDRV_SECTOR_SIZE);
524 }
525
526 if (!virtio_blk_sect_range_ok(req->dev, req->sector_num,
527 req->qiov.size)) {
528 virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR);
529 block_acct_invalid(blk_get_stats(req->dev->blk),
530 is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ);
531 virtio_blk_free_request(req);
532 return;
533 }
534
535 block_acct_start(blk_get_stats(req->dev->blk),
536 &req->acct, req->qiov.size,
537 is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ);
538
539
540
541 if (mrb->num_reqs > 0 && (mrb->num_reqs == VIRTIO_BLK_MAX_MERGE_REQS ||
542 is_write != mrb->is_write ||
543 !req->dev->conf.request_merging)) {
544 virtio_blk_submit_multireq(req->dev->blk, mrb);
545 }
546
547 assert(mrb->num_reqs < VIRTIO_BLK_MAX_MERGE_REQS);
548 mrb->reqs[mrb->num_reqs++] = req;
549 mrb->is_write = is_write;
550 break;
551 }
552 case VIRTIO_BLK_T_FLUSH:
553 virtio_blk_handle_flush(req, mrb);
554 break;
555 case VIRTIO_BLK_T_SCSI_CMD:
556 virtio_blk_handle_scsi(req);
557 break;
558 case VIRTIO_BLK_T_GET_ID:
559 {
560 VirtIOBlock *s = req->dev;
561
562
563
564
565
566 const char *serial = s->conf.serial ? s->conf.serial : "";
567 size_t size = MIN(strlen(serial) + 1,
568 MIN(iov_size(in_iov, in_num),
569 VIRTIO_BLK_ID_BYTES));
570 iov_from_buf(in_iov, in_num, 0, serial, size);
571 virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
572 virtio_blk_free_request(req);
573 break;
574 }
575 default:
576 virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP);
577 virtio_blk_free_request(req);
578 }
579}
580
581void virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq)
582{
583 VirtIOBlockReq *req;
584 MultiReqBuffer mrb = {};
585
586 blk_io_plug(s->blk);
587
588 while ((req = virtio_blk_get_request(s, vq))) {
589 virtio_blk_handle_request(req, &mrb);
590 }
591
592 if (mrb.num_reqs) {
593 virtio_blk_submit_multireq(s->blk, &mrb);
594 }
595
596 blk_io_unplug(s->blk);
597}
598
599static void virtio_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq)
600{
601 VirtIOBlock *s = (VirtIOBlock *)vdev;
602
603 if (s->dataplane) {
604
605
606
607 virtio_blk_data_plane_start(s->dataplane);
608 if (!s->dataplane_disabled) {
609 return;
610 }
611 }
612 virtio_blk_handle_vq(s, vq);
613}
614
615static void virtio_blk_dma_restart_bh(void *opaque)
616{
617 VirtIOBlock *s = opaque;
618 VirtIOBlockReq *req = s->rq;
619 MultiReqBuffer mrb = {};
620
621 qemu_bh_delete(s->bh);
622 s->bh = NULL;
623
624 s->rq = NULL;
625
626 while (req) {
627 VirtIOBlockReq *next = req->next;
628 virtio_blk_handle_request(req, &mrb);
629 req = next;
630 }
631
632 if (mrb.num_reqs) {
633 virtio_blk_submit_multireq(s->blk, &mrb);
634 }
635}
636
637static void virtio_blk_dma_restart_cb(void *opaque, int running,
638 RunState state)
639{
640 VirtIOBlock *s = opaque;
641
642 if (!running) {
643 return;
644 }
645
646 if (!s->bh) {
647 s->bh = aio_bh_new(blk_get_aio_context(s->conf.conf.blk),
648 virtio_blk_dma_restart_bh, s);
649 qemu_bh_schedule(s->bh);
650 }
651}
652
653static void virtio_blk_reset(VirtIODevice *vdev)
654{
655 VirtIOBlock *s = VIRTIO_BLK(vdev);
656 AioContext *ctx;
657 VirtIOBlockReq *req;
658
659 ctx = blk_get_aio_context(s->blk);
660 aio_context_acquire(ctx);
661 blk_drain(s->blk);
662
663
664
665 while (s->rq) {
666 req = s->rq;
667 s->rq = req->next;
668 virtio_blk_free_request(req);
669 }
670
671 if (s->dataplane) {
672 virtio_blk_data_plane_stop(s->dataplane);
673 }
674 aio_context_release(ctx);
675
676 blk_set_enable_write_cache(s->blk, s->original_wce);
677}
678
679
680
681static void virtio_blk_update_config(VirtIODevice *vdev, uint8_t *config)
682{
683 VirtIOBlock *s = VIRTIO_BLK(vdev);
684 BlockConf *conf = &s->conf.conf;
685 struct virtio_blk_config blkcfg;
686 uint64_t capacity;
687 int blk_size = conf->logical_block_size;
688
689 blk_get_geometry(s->blk, &capacity);
690 memset(&blkcfg, 0, sizeof(blkcfg));
691 virtio_stq_p(vdev, &blkcfg.capacity, capacity);
692 virtio_stl_p(vdev, &blkcfg.seg_max, 128 - 2);
693 virtio_stw_p(vdev, &blkcfg.geometry.cylinders, conf->cyls);
694 virtio_stl_p(vdev, &blkcfg.blk_size, blk_size);
695 virtio_stw_p(vdev, &blkcfg.min_io_size, conf->min_io_size / blk_size);
696 virtio_stw_p(vdev, &blkcfg.opt_io_size, conf->opt_io_size / blk_size);
697 blkcfg.geometry.heads = conf->heads;
698
699
700
701
702
703
704
705
706
707
708
709 if (blk_getlength(s->blk) / conf->heads / conf->secs % blk_size) {
710 blkcfg.geometry.sectors = conf->secs & ~s->sector_mask;
711 } else {
712 blkcfg.geometry.sectors = conf->secs;
713 }
714 blkcfg.size_max = 0;
715 blkcfg.physical_block_exp = get_physical_block_exp(conf);
716 blkcfg.alignment_offset = 0;
717 blkcfg.wce = blk_enable_write_cache(s->blk);
718 virtio_stw_p(vdev, &blkcfg.num_queues, s->conf.num_queues);
719 memcpy(config, &blkcfg, sizeof(struct virtio_blk_config));
720}
721
722static void virtio_blk_set_config(VirtIODevice *vdev, const uint8_t *config)
723{
724 VirtIOBlock *s = VIRTIO_BLK(vdev);
725 struct virtio_blk_config blkcfg;
726
727 memcpy(&blkcfg, config, sizeof(blkcfg));
728
729 aio_context_acquire(blk_get_aio_context(s->blk));
730 blk_set_enable_write_cache(s->blk, blkcfg.wce != 0);
731 aio_context_release(blk_get_aio_context(s->blk));
732}
733
734static uint64_t virtio_blk_get_features(VirtIODevice *vdev, uint64_t features,
735 Error **errp)
736{
737 VirtIOBlock *s = VIRTIO_BLK(vdev);
738
739 virtio_add_feature(&features, VIRTIO_BLK_F_SEG_MAX);
740 virtio_add_feature(&features, VIRTIO_BLK_F_GEOMETRY);
741 virtio_add_feature(&features, VIRTIO_BLK_F_TOPOLOGY);
742 virtio_add_feature(&features, VIRTIO_BLK_F_BLK_SIZE);
743 if (virtio_has_feature(features, VIRTIO_F_VERSION_1)) {
744 if (s->conf.scsi) {
745 error_setg(errp, "Please set scsi=off for virtio-blk devices in order to use virtio 1.0");
746 return 0;
747 }
748 } else {
749 virtio_clear_feature(&features, VIRTIO_F_ANY_LAYOUT);
750 virtio_add_feature(&features, VIRTIO_BLK_F_SCSI);
751 }
752
753 if (s->conf.config_wce) {
754 virtio_add_feature(&features, VIRTIO_BLK_F_CONFIG_WCE);
755 }
756 if (blk_enable_write_cache(s->blk)) {
757 virtio_add_feature(&features, VIRTIO_BLK_F_WCE);
758 }
759 if (blk_is_read_only(s->blk)) {
760 virtio_add_feature(&features, VIRTIO_BLK_F_RO);
761 }
762 if (s->conf.num_queues > 1) {
763 virtio_add_feature(&features, VIRTIO_BLK_F_MQ);
764 }
765
766 return features;
767}
768
769static void virtio_blk_set_status(VirtIODevice *vdev, uint8_t status)
770{
771 VirtIOBlock *s = VIRTIO_BLK(vdev);
772
773 if (s->dataplane && !(status & (VIRTIO_CONFIG_S_DRIVER |
774 VIRTIO_CONFIG_S_DRIVER_OK))) {
775 virtio_blk_data_plane_stop(s->dataplane);
776 }
777
778 if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
779 return;
780 }
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797 if (!virtio_vdev_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE)) {
798 aio_context_acquire(blk_get_aio_context(s->blk));
799 blk_set_enable_write_cache(s->blk,
800 virtio_vdev_has_feature(vdev,
801 VIRTIO_BLK_F_WCE));
802 aio_context_release(blk_get_aio_context(s->blk));
803 }
804}
805
806static void virtio_blk_save(QEMUFile *f, void *opaque, size_t size)
807{
808 VirtIODevice *vdev = VIRTIO_DEVICE(opaque);
809
810 virtio_save(vdev, f);
811}
812
813static void virtio_blk_save_device(VirtIODevice *vdev, QEMUFile *f)
814{
815 VirtIOBlock *s = VIRTIO_BLK(vdev);
816 VirtIOBlockReq *req = s->rq;
817
818 while (req) {
819 qemu_put_sbyte(f, 1);
820
821 if (s->conf.num_queues > 1) {
822 qemu_put_be32(f, virtio_get_queue_index(req->vq));
823 }
824
825 qemu_put_virtqueue_element(f, &req->elem);
826 req = req->next;
827 }
828 qemu_put_sbyte(f, 0);
829}
830
831static int virtio_blk_load(QEMUFile *f, void *opaque, size_t size)
832{
833 VirtIOBlock *s = opaque;
834 VirtIODevice *vdev = VIRTIO_DEVICE(s);
835
836 return virtio_load(vdev, f, 2);
837}
838
839static int virtio_blk_load_device(VirtIODevice *vdev, QEMUFile *f,
840 int version_id)
841{
842 VirtIOBlock *s = VIRTIO_BLK(vdev);
843
844 while (qemu_get_sbyte(f)) {
845 unsigned nvqs = s->conf.num_queues;
846 unsigned vq_idx = 0;
847 VirtIOBlockReq *req;
848
849 if (nvqs > 1) {
850 vq_idx = qemu_get_be32(f);
851
852 if (vq_idx >= nvqs) {
853 error_report("Invalid virtqueue index in request list: %#x",
854 vq_idx);
855 return -EINVAL;
856 }
857 }
858
859 req = qemu_get_virtqueue_element(f, sizeof(VirtIOBlockReq));
860 virtio_blk_init_request(s, virtio_get_queue(vdev, vq_idx), req);
861 req->next = s->rq;
862 s->rq = req;
863 }
864
865 return 0;
866}
867
868static void virtio_blk_resize(void *opaque)
869{
870 VirtIODevice *vdev = VIRTIO_DEVICE(opaque);
871
872 virtio_notify_config(vdev);
873}
874
875static const BlockDevOps virtio_block_ops = {
876 .resize_cb = virtio_blk_resize,
877};
878
879static void virtio_blk_device_realize(DeviceState *dev, Error **errp)
880{
881 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
882 VirtIOBlock *s = VIRTIO_BLK(dev);
883 VirtIOBlkConf *conf = &s->conf;
884 Error *err = NULL;
885 unsigned i;
886
887 if (!conf->conf.blk) {
888 error_setg(errp, "drive property not set");
889 return;
890 }
891 if (!blk_is_inserted(conf->conf.blk)) {
892 error_setg(errp, "Device needs media, but drive is empty");
893 return;
894 }
895 if (!conf->num_queues) {
896 error_setg(errp, "num-queues property must be larger than 0");
897 return;
898 }
899
900 blkconf_serial(&conf->conf, &conf->serial);
901 blkconf_apply_backend_options(&conf->conf);
902 s->original_wce = blk_enable_write_cache(conf->conf.blk);
903 blkconf_geometry(&conf->conf, NULL, 65535, 255, 255, &err);
904 if (err) {
905 error_propagate(errp, err);
906 return;
907 }
908 blkconf_blocksizes(&conf->conf);
909
910 virtio_init(vdev, "virtio-blk", VIRTIO_ID_BLOCK,
911 sizeof(struct virtio_blk_config));
912
913 s->blk = conf->conf.blk;
914 s->rq = NULL;
915 s->sector_mask = (s->conf.conf.logical_block_size / BDRV_SECTOR_SIZE) - 1;
916
917 for (i = 0; i < conf->num_queues; i++) {
918 virtio_add_queue_aio(vdev, 128, virtio_blk_handle_output);
919 }
920 virtio_blk_data_plane_create(vdev, conf, &s->dataplane, &err);
921 if (err != NULL) {
922 error_propagate(errp, err);
923 virtio_cleanup(vdev);
924 return;
925 }
926
927 s->change = qemu_add_vm_change_state_handler(virtio_blk_dma_restart_cb, s);
928 blk_set_dev_ops(s->blk, &virtio_block_ops, s);
929 blk_set_guest_block_size(s->blk, s->conf.conf.logical_block_size);
930
931 blk_iostatus_enable(s->blk);
932}
933
934static void virtio_blk_device_unrealize(DeviceState *dev, Error **errp)
935{
936 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
937 VirtIOBlock *s = VIRTIO_BLK(dev);
938
939 virtio_blk_data_plane_destroy(s->dataplane);
940 s->dataplane = NULL;
941 qemu_del_vm_change_state_handler(s->change);
942 blockdev_mark_auto_del(s->blk);
943 virtio_cleanup(vdev);
944}
945
946static void virtio_blk_instance_init(Object *obj)
947{
948 VirtIOBlock *s = VIRTIO_BLK(obj);
949
950 object_property_add_link(obj, "iothread", TYPE_IOTHREAD,
951 (Object **)&s->conf.iothread,
952 qdev_prop_allow_set_link_before_realize,
953 OBJ_PROP_LINK_UNREF_ON_RELEASE, NULL);
954 device_add_bootindex_property(obj, &s->conf.conf.bootindex,
955 "bootindex", "/disk@0,0",
956 DEVICE(obj), NULL);
957}
958
959VMSTATE_VIRTIO_DEVICE(blk, 2, virtio_blk_load, virtio_blk_save);
960
961static Property virtio_blk_properties[] = {
962 DEFINE_BLOCK_PROPERTIES(VirtIOBlock, conf.conf),
963 DEFINE_BLOCK_ERROR_PROPERTIES(VirtIOBlock, conf.conf),
964 DEFINE_BLOCK_CHS_PROPERTIES(VirtIOBlock, conf.conf),
965 DEFINE_PROP_STRING("serial", VirtIOBlock, conf.serial),
966 DEFINE_PROP_BIT("config-wce", VirtIOBlock, conf.config_wce, 0, true),
967#ifdef __linux__
968 DEFINE_PROP_BIT("scsi", VirtIOBlock, conf.scsi, 0, false),
969#endif
970 DEFINE_PROP_BIT("request-merging", VirtIOBlock, conf.request_merging, 0,
971 true),
972 DEFINE_PROP_UINT16("num-queues", VirtIOBlock, conf.num_queues, 1),
973 DEFINE_PROP_END_OF_LIST(),
974};
975
976static void virtio_blk_class_init(ObjectClass *klass, void *data)
977{
978 DeviceClass *dc = DEVICE_CLASS(klass);
979 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
980
981 dc->props = virtio_blk_properties;
982 dc->vmsd = &vmstate_virtio_blk;
983 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
984 vdc->realize = virtio_blk_device_realize;
985 vdc->unrealize = virtio_blk_device_unrealize;
986 vdc->get_config = virtio_blk_update_config;
987 vdc->set_config = virtio_blk_set_config;
988 vdc->get_features = virtio_blk_get_features;
989 vdc->set_status = virtio_blk_set_status;
990 vdc->reset = virtio_blk_reset;
991 vdc->save = virtio_blk_save_device;
992 vdc->load = virtio_blk_load_device;
993}
994
995static const TypeInfo virtio_device_info = {
996 .name = TYPE_VIRTIO_BLK,
997 .parent = TYPE_VIRTIO_DEVICE,
998 .instance_size = sizeof(VirtIOBlock),
999 .instance_init = virtio_blk_instance_init,
1000 .class_init = virtio_blk_class_init,
1001};
1002
1003static void virtio_register_types(void)
1004{
1005 type_register_static(&virtio_device_info);
1006}
1007
1008type_init(virtio_register_types)
1009