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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, VirtIOBlockReq *req)
33{
34 req->dev = s;
35 req->qiov.size = 0;
36 req->in_len = 0;
37 req->next = NULL;
38 req->mr_next = NULL;
39}
40
41void virtio_blk_free_request(VirtIOBlockReq *req)
42{
43 if (req) {
44 g_free(req);
45 }
46}
47
48static void virtio_blk_req_complete(VirtIOBlockReq *req, unsigned char status)
49{
50 VirtIOBlock *s = req->dev;
51 VirtIODevice *vdev = VIRTIO_DEVICE(s);
52
53 trace_virtio_blk_req_complete(req, status);
54
55 stb_p(&req->in->status, status);
56 virtqueue_push(s->vq, &req->elem, req->in_len);
57 if (s->dataplane_started && !s->dataplane_disabled) {
58 virtio_blk_data_plane_notify(s->dataplane);
59 } else {
60 virtio_notify(vdev, s->vq);
61 }
62}
63
64static int virtio_blk_handle_rw_error(VirtIOBlockReq *req, int error,
65 bool is_read)
66{
67 BlockErrorAction action = blk_get_error_action(req->dev->blk,
68 is_read, error);
69 VirtIOBlock *s = req->dev;
70
71 if (action == BLOCK_ERROR_ACTION_STOP) {
72
73
74 req->mr_next = NULL;
75 req->next = s->rq;
76 s->rq = req;
77 } else if (action == BLOCK_ERROR_ACTION_REPORT) {
78 virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR);
79 block_acct_failed(blk_get_stats(s->blk), &req->acct);
80 virtio_blk_free_request(req);
81 }
82
83 blk_error_action(s->blk, action, is_read, error);
84 return action != BLOCK_ERROR_ACTION_IGNORE;
85}
86
87static void virtio_blk_rw_complete(void *opaque, int ret)
88{
89 VirtIOBlockReq *next = opaque;
90
91 while (next) {
92 VirtIOBlockReq *req = next;
93 next = req->mr_next;
94 trace_virtio_blk_rw_complete(req, ret);
95
96 if (req->qiov.nalloc != -1) {
97
98
99
100 qemu_iovec_destroy(&req->qiov);
101 }
102
103 if (ret) {
104 int p = virtio_ldl_p(VIRTIO_DEVICE(req->dev), &req->out.type);
105 bool is_read = !(p & VIRTIO_BLK_T_OUT);
106
107
108
109
110
111
112
113
114 if (virtio_blk_handle_rw_error(req, -ret, is_read)) {
115 continue;
116 }
117 }
118
119 virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
120 block_acct_done(blk_get_stats(req->dev->blk), &req->acct);
121 virtio_blk_free_request(req);
122 }
123}
124
125static void virtio_blk_flush_complete(void *opaque, int ret)
126{
127 VirtIOBlockReq *req = opaque;
128
129 if (ret) {
130 if (virtio_blk_handle_rw_error(req, -ret, 0)) {
131 return;
132 }
133 }
134
135 virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
136 block_acct_done(blk_get_stats(req->dev->blk), &req->acct);
137 virtio_blk_free_request(req);
138}
139
140#ifdef __linux__
141
142typedef struct {
143 VirtIOBlockReq *req;
144 struct sg_io_hdr hdr;
145} VirtIOBlockIoctlReq;
146
147static void virtio_blk_ioctl_complete(void *opaque, int status)
148{
149 VirtIOBlockIoctlReq *ioctl_req = opaque;
150 VirtIOBlockReq *req = ioctl_req->req;
151 VirtIODevice *vdev = VIRTIO_DEVICE(req->dev);
152 struct virtio_scsi_inhdr *scsi;
153 struct sg_io_hdr *hdr;
154
155 scsi = (void *)req->elem.in_sg[req->elem.in_num - 2].iov_base;
156
157 if (status) {
158 status = VIRTIO_BLK_S_UNSUPP;
159 virtio_stl_p(vdev, &scsi->errors, 255);
160 goto out;
161 }
162
163 hdr = &ioctl_req->hdr;
164
165
166
167
168
169
170
171 if (hdr->status == 0 && hdr->sb_len_wr > 0) {
172 hdr->status = CHECK_CONDITION;
173 }
174
175 virtio_stl_p(vdev, &scsi->errors,
176 hdr->status | (hdr->msg_status << 8) |
177 (hdr->host_status << 16) | (hdr->driver_status << 24));
178 virtio_stl_p(vdev, &scsi->residual, hdr->resid);
179 virtio_stl_p(vdev, &scsi->sense_len, hdr->sb_len_wr);
180 virtio_stl_p(vdev, &scsi->data_len, hdr->dxfer_len);
181
182out:
183 virtio_blk_req_complete(req, status);
184 virtio_blk_free_request(req);
185 g_free(ioctl_req);
186}
187
188#endif
189
190static VirtIOBlockReq *virtio_blk_get_request(VirtIOBlock *s)
191{
192 VirtIOBlockReq *req = virtqueue_pop(s->vq, sizeof(VirtIOBlockReq));
193
194 if (req) {
195 virtio_blk_init_request(s, req);
196 }
197 return req;
198}
199
200static int virtio_blk_handle_scsi_req(VirtIOBlockReq *req)
201{
202 int status = VIRTIO_BLK_S_OK;
203 struct virtio_scsi_inhdr *scsi = NULL;
204 VirtIODevice *vdev = VIRTIO_DEVICE(req->dev);
205 VirtQueueElement *elem = &req->elem;
206 VirtIOBlock *blk = req->dev;
207
208#ifdef __linux__
209 int i;
210 VirtIOBlockIoctlReq *ioctl_req;
211 BlockAIOCB *acb;
212#endif
213
214
215
216
217
218
219
220
221 if (elem->out_num < 2 || elem->in_num < 3) {
222 status = VIRTIO_BLK_S_IOERR;
223 goto fail;
224 }
225
226
227
228
229
230 scsi = (void *)elem->in_sg[elem->in_num - 2].iov_base;
231
232 if (!blk->conf.scsi) {
233 status = VIRTIO_BLK_S_UNSUPP;
234 goto fail;
235 }
236
237
238
239
240 if (elem->out_num > 2 && elem->in_num > 3) {
241 status = VIRTIO_BLK_S_UNSUPP;
242 goto fail;
243 }
244
245#ifdef __linux__
246 ioctl_req = g_new0(VirtIOBlockIoctlReq, 1);
247 ioctl_req->req = req;
248 ioctl_req->hdr.interface_id = 'S';
249 ioctl_req->hdr.cmd_len = elem->out_sg[1].iov_len;
250 ioctl_req->hdr.cmdp = elem->out_sg[1].iov_base;
251 ioctl_req->hdr.dxfer_len = 0;
252
253 if (elem->out_num > 2) {
254
255
256
257
258 ioctl_req->hdr.dxfer_direction = SG_DXFER_TO_DEV;
259 ioctl_req->hdr.iovec_count = elem->out_num - 2;
260
261 for (i = 0; i < ioctl_req->hdr.iovec_count; i++) {
262 ioctl_req->hdr.dxfer_len += elem->out_sg[i + 2].iov_len;
263 }
264
265 ioctl_req->hdr.dxferp = elem->out_sg + 2;
266
267 } else if (elem->in_num > 3) {
268
269
270
271
272 ioctl_req->hdr.dxfer_direction = SG_DXFER_FROM_DEV;
273 ioctl_req->hdr.iovec_count = elem->in_num - 3;
274 for (i = 0; i < ioctl_req->hdr.iovec_count; i++) {
275 ioctl_req->hdr.dxfer_len += elem->in_sg[i].iov_len;
276 }
277
278 ioctl_req->hdr.dxferp = elem->in_sg;
279 } else {
280
281
282
283 ioctl_req->hdr.dxfer_direction = SG_DXFER_NONE;
284 }
285
286 ioctl_req->hdr.sbp = elem->in_sg[elem->in_num - 3].iov_base;
287 ioctl_req->hdr.mx_sb_len = elem->in_sg[elem->in_num - 3].iov_len;
288
289 acb = blk_aio_ioctl(blk->blk, SG_IO, &ioctl_req->hdr,
290 virtio_blk_ioctl_complete, ioctl_req);
291 if (!acb) {
292 g_free(ioctl_req);
293 status = VIRTIO_BLK_S_UNSUPP;
294 goto fail;
295 }
296 return -EINPROGRESS;
297#else
298 abort();
299#endif
300
301fail:
302
303 if (scsi) {
304 virtio_stl_p(vdev, &scsi->errors, 255);
305 }
306 return status;
307}
308
309static void virtio_blk_handle_scsi(VirtIOBlockReq *req)
310{
311 int status;
312
313 status = virtio_blk_handle_scsi_req(req);
314 if (status != -EINPROGRESS) {
315 virtio_blk_req_complete(req, status);
316 virtio_blk_free_request(req);
317 }
318}
319
320static inline void submit_requests(BlockBackend *blk, MultiReqBuffer *mrb,
321 int start, int num_reqs, int niov)
322{
323 QEMUIOVector *qiov = &mrb->reqs[start]->qiov;
324 int64_t sector_num = mrb->reqs[start]->sector_num;
325 int nb_sectors = mrb->reqs[start]->qiov.size / BDRV_SECTOR_SIZE;
326 bool is_write = mrb->is_write;
327
328 if (num_reqs > 1) {
329 int i;
330 struct iovec *tmp_iov = qiov->iov;
331 int tmp_niov = qiov->niov;
332
333
334
335
336 qemu_iovec_init(qiov, niov);
337
338 for (i = 0; i < tmp_niov; i++) {
339 qemu_iovec_add(qiov, tmp_iov[i].iov_base, tmp_iov[i].iov_len);
340 }
341
342 for (i = start + 1; i < start + num_reqs; i++) {
343 qemu_iovec_concat(qiov, &mrb->reqs[i]->qiov, 0,
344 mrb->reqs[i]->qiov.size);
345 mrb->reqs[i - 1]->mr_next = mrb->reqs[i];
346 nb_sectors += mrb->reqs[i]->qiov.size / BDRV_SECTOR_SIZE;
347 }
348 assert(nb_sectors == qiov->size / BDRV_SECTOR_SIZE);
349
350 trace_virtio_blk_submit_multireq(mrb, start, num_reqs, sector_num,
351 nb_sectors, 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_writev(blk, sector_num, qiov, nb_sectors,
359 virtio_blk_rw_complete, mrb->reqs[start]);
360 } else {
361 blk_aio_readv(blk, sector_num, qiov, nb_sectors,
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 int max_xfer_len = 0;
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_xfer_len = blk_get_max_transfer_length(mrb->reqs[0]->dev->blk);
397 max_xfer_len = MIN_NON_ZERO(max_xfer_len, BDRV_REQUEST_MAX_SECTORS);
398
399 qsort(mrb->reqs, mrb->num_reqs, sizeof(*mrb->reqs),
400 &multireq_compare);
401
402 for (i = 0; i < mrb->num_reqs; i++) {
403 VirtIOBlockReq *req = mrb->reqs[i];
404 if (num_reqs > 0) {
405
406
407
408
409
410
411 if (sector_num + nb_sectors != req->sector_num ||
412 niov > blk_get_max_iov(blk) - req->qiov.niov ||
413 req->qiov.size / BDRV_SECTOR_SIZE > max_xfer_len ||
414 nb_sectors > max_xfer_len - 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))) {
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
658
659
660
661
662 ctx = blk_get_aio_context(s->blk);
663 aio_context_acquire(ctx);
664 blk_drain(s->blk);
665
666 if (s->dataplane) {
667 virtio_blk_data_plane_stop(s->dataplane);
668 }
669 aio_context_release(ctx);
670
671 blk_set_enable_write_cache(s->blk, s->original_wce);
672}
673
674
675
676static void virtio_blk_update_config(VirtIODevice *vdev, uint8_t *config)
677{
678 VirtIOBlock *s = VIRTIO_BLK(vdev);
679 BlockConf *conf = &s->conf.conf;
680 struct virtio_blk_config blkcfg;
681 uint64_t capacity;
682 int blk_size = conf->logical_block_size;
683
684 blk_get_geometry(s->blk, &capacity);
685 memset(&blkcfg, 0, sizeof(blkcfg));
686 virtio_stq_p(vdev, &blkcfg.capacity, capacity);
687 virtio_stl_p(vdev, &blkcfg.seg_max, 128 - 2);
688 virtio_stw_p(vdev, &blkcfg.geometry.cylinders, conf->cyls);
689 virtio_stl_p(vdev, &blkcfg.blk_size, blk_size);
690 virtio_stw_p(vdev, &blkcfg.min_io_size, conf->min_io_size / blk_size);
691 virtio_stw_p(vdev, &blkcfg.opt_io_size, conf->opt_io_size / blk_size);
692 blkcfg.geometry.heads = conf->heads;
693
694
695
696
697
698
699
700
701
702
703
704 if (blk_getlength(s->blk) / conf->heads / conf->secs % blk_size) {
705 blkcfg.geometry.sectors = conf->secs & ~s->sector_mask;
706 } else {
707 blkcfg.geometry.sectors = conf->secs;
708 }
709 blkcfg.size_max = 0;
710 blkcfg.physical_block_exp = get_physical_block_exp(conf);
711 blkcfg.alignment_offset = 0;
712 blkcfg.wce = blk_enable_write_cache(s->blk);
713 memcpy(config, &blkcfg, sizeof(struct virtio_blk_config));
714}
715
716static void virtio_blk_set_config(VirtIODevice *vdev, const uint8_t *config)
717{
718 VirtIOBlock *s = VIRTIO_BLK(vdev);
719 struct virtio_blk_config blkcfg;
720
721 memcpy(&blkcfg, config, sizeof(blkcfg));
722
723 aio_context_acquire(blk_get_aio_context(s->blk));
724 blk_set_enable_write_cache(s->blk, blkcfg.wce != 0);
725 aio_context_release(blk_get_aio_context(s->blk));
726}
727
728static uint64_t virtio_blk_get_features(VirtIODevice *vdev, uint64_t features,
729 Error **errp)
730{
731 VirtIOBlock *s = VIRTIO_BLK(vdev);
732
733 virtio_add_feature(&features, VIRTIO_BLK_F_SEG_MAX);
734 virtio_add_feature(&features, VIRTIO_BLK_F_GEOMETRY);
735 virtio_add_feature(&features, VIRTIO_BLK_F_TOPOLOGY);
736 virtio_add_feature(&features, VIRTIO_BLK_F_BLK_SIZE);
737 if (virtio_has_feature(features, VIRTIO_F_VERSION_1)) {
738 if (s->conf.scsi) {
739 error_setg(errp, "Please set scsi=off for virtio-blk devices in order to use virtio 1.0");
740 return 0;
741 }
742 } else {
743 virtio_clear_feature(&features, VIRTIO_F_ANY_LAYOUT);
744 virtio_add_feature(&features, VIRTIO_BLK_F_SCSI);
745 }
746
747 if (s->conf.config_wce) {
748 virtio_add_feature(&features, VIRTIO_BLK_F_CONFIG_WCE);
749 }
750 if (blk_enable_write_cache(s->blk)) {
751 virtio_add_feature(&features, VIRTIO_BLK_F_WCE);
752 }
753 if (blk_is_read_only(s->blk)) {
754 virtio_add_feature(&features, VIRTIO_BLK_F_RO);
755 }
756
757 return features;
758}
759
760static void virtio_blk_set_status(VirtIODevice *vdev, uint8_t status)
761{
762 VirtIOBlock *s = VIRTIO_BLK(vdev);
763
764 if (s->dataplane && !(status & (VIRTIO_CONFIG_S_DRIVER |
765 VIRTIO_CONFIG_S_DRIVER_OK))) {
766 virtio_blk_data_plane_stop(s->dataplane);
767 }
768
769 if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
770 return;
771 }
772
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784
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786
787
788 if (!virtio_vdev_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE)) {
789 aio_context_acquire(blk_get_aio_context(s->blk));
790 blk_set_enable_write_cache(s->blk,
791 virtio_vdev_has_feature(vdev,
792 VIRTIO_BLK_F_WCE));
793 aio_context_release(blk_get_aio_context(s->blk));
794 }
795}
796
797static void virtio_blk_save(QEMUFile *f, void *opaque)
798{
799 VirtIODevice *vdev = VIRTIO_DEVICE(opaque);
800 VirtIOBlock *s = VIRTIO_BLK(vdev);
801
802 if (s->dataplane) {
803 virtio_blk_data_plane_stop(s->dataplane);
804 }
805
806 virtio_save(vdev, f);
807}
808
809static void virtio_blk_save_device(VirtIODevice *vdev, QEMUFile *f)
810{
811 VirtIOBlock *s = VIRTIO_BLK(vdev);
812 VirtIOBlockReq *req = s->rq;
813
814 while (req) {
815 qemu_put_sbyte(f, 1);
816 qemu_put_virtqueue_element(f, &req->elem);
817 req = req->next;
818 }
819 qemu_put_sbyte(f, 0);
820}
821
822static int virtio_blk_load(QEMUFile *f, void *opaque, int version_id)
823{
824 VirtIOBlock *s = opaque;
825 VirtIODevice *vdev = VIRTIO_DEVICE(s);
826
827 if (version_id != 2)
828 return -EINVAL;
829
830 return virtio_load(vdev, f, version_id);
831}
832
833static int virtio_blk_load_device(VirtIODevice *vdev, QEMUFile *f,
834 int version_id)
835{
836 VirtIOBlock *s = VIRTIO_BLK(vdev);
837
838 while (qemu_get_sbyte(f)) {
839 VirtIOBlockReq *req;
840 req = qemu_get_virtqueue_element(f, sizeof(VirtIOBlockReq));
841 virtio_blk_init_request(s, req);
842 req->next = s->rq;
843 s->rq = req;
844 }
845
846 return 0;
847}
848
849static void virtio_blk_resize(void *opaque)
850{
851 VirtIODevice *vdev = VIRTIO_DEVICE(opaque);
852
853 virtio_notify_config(vdev);
854}
855
856static const BlockDevOps virtio_block_ops = {
857 .resize_cb = virtio_blk_resize,
858};
859
860static void virtio_blk_device_realize(DeviceState *dev, Error **errp)
861{
862 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
863 VirtIOBlock *s = VIRTIO_BLK(dev);
864 VirtIOBlkConf *conf = &s->conf;
865 Error *err = NULL;
866 static int virtio_blk_id;
867
868 if (!conf->conf.blk) {
869 error_setg(errp, "drive property not set");
870 return;
871 }
872 if (!blk_is_inserted(conf->conf.blk)) {
873 error_setg(errp, "Device needs media, but drive is empty");
874 return;
875 }
876
877 blkconf_serial(&conf->conf, &conf->serial);
878 s->original_wce = blk_enable_write_cache(conf->conf.blk);
879 blkconf_geometry(&conf->conf, NULL, 65535, 255, 255, &err);
880 if (err) {
881 error_propagate(errp, err);
882 return;
883 }
884 blkconf_blocksizes(&conf->conf);
885
886 virtio_init(vdev, "virtio-blk", VIRTIO_ID_BLOCK,
887 sizeof(struct virtio_blk_config));
888
889 s->blk = conf->conf.blk;
890 s->rq = NULL;
891 s->sector_mask = (s->conf.conf.logical_block_size / BDRV_SECTOR_SIZE) - 1;
892
893 s->vq = virtio_add_queue(vdev, 128, virtio_blk_handle_output);
894 virtio_blk_data_plane_create(vdev, conf, &s->dataplane, &err);
895 if (err != NULL) {
896 error_propagate(errp, err);
897 virtio_cleanup(vdev);
898 return;
899 }
900
901 s->change = qemu_add_vm_change_state_handler(virtio_blk_dma_restart_cb, s);
902 register_savevm(dev, "virtio-blk", virtio_blk_id++, 2,
903 virtio_blk_save, virtio_blk_load, s);
904 blk_set_dev_ops(s->blk, &virtio_block_ops, s);
905 blk_set_guest_block_size(s->blk, s->conf.conf.logical_block_size);
906
907 blk_iostatus_enable(s->blk);
908}
909
910static void virtio_blk_device_unrealize(DeviceState *dev, Error **errp)
911{
912 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
913 VirtIOBlock *s = VIRTIO_BLK(dev);
914
915 virtio_blk_data_plane_destroy(s->dataplane);
916 s->dataplane = NULL;
917 qemu_del_vm_change_state_handler(s->change);
918 unregister_savevm(dev, "virtio-blk", s);
919 blockdev_mark_auto_del(s->blk);
920 virtio_cleanup(vdev);
921}
922
923static void virtio_blk_instance_init(Object *obj)
924{
925 VirtIOBlock *s = VIRTIO_BLK(obj);
926
927 object_property_add_link(obj, "iothread", TYPE_IOTHREAD,
928 (Object **)&s->conf.iothread,
929 qdev_prop_allow_set_link_before_realize,
930 OBJ_PROP_LINK_UNREF_ON_RELEASE, NULL);
931 device_add_bootindex_property(obj, &s->conf.conf.bootindex,
932 "bootindex", "/disk@0,0",
933 DEVICE(obj), NULL);
934}
935
936static Property virtio_blk_properties[] = {
937 DEFINE_BLOCK_PROPERTIES(VirtIOBlock, conf.conf),
938 DEFINE_BLOCK_CHS_PROPERTIES(VirtIOBlock, conf.conf),
939 DEFINE_PROP_STRING("serial", VirtIOBlock, conf.serial),
940 DEFINE_PROP_BIT("config-wce", VirtIOBlock, conf.config_wce, 0, true),
941#ifdef __linux__
942 DEFINE_PROP_BIT("scsi", VirtIOBlock, conf.scsi, 0, false),
943#endif
944 DEFINE_PROP_BIT("request-merging", VirtIOBlock, conf.request_merging, 0,
945 true),
946 DEFINE_PROP_END_OF_LIST(),
947};
948
949static void virtio_blk_class_init(ObjectClass *klass, void *data)
950{
951 DeviceClass *dc = DEVICE_CLASS(klass);
952 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
953
954 dc->props = virtio_blk_properties;
955 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
956 vdc->realize = virtio_blk_device_realize;
957 vdc->unrealize = virtio_blk_device_unrealize;
958 vdc->get_config = virtio_blk_update_config;
959 vdc->set_config = virtio_blk_set_config;
960 vdc->get_features = virtio_blk_get_features;
961 vdc->set_status = virtio_blk_set_status;
962 vdc->reset = virtio_blk_reset;
963 vdc->save = virtio_blk_save_device;
964 vdc->load = virtio_blk_load_device;
965}
966
967static const TypeInfo virtio_device_info = {
968 .name = TYPE_VIRTIO_BLK,
969 .parent = TYPE_VIRTIO_DEVICE,
970 .instance_size = sizeof(VirtIOBlock),
971 .instance_init = virtio_blk_instance_init,
972 .class_init = virtio_blk_class_init,
973};
974
975static void virtio_register_types(void)
976{
977 type_register_static(&virtio_device_info);
978}
979
980type_init(virtio_register_types)
981