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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 "block/block_int.h"
21#include "trace.h"
22#include "hw/block/block.h"
23#include "hw/qdev-properties.h"
24#include "sysemu/blockdev.h"
25#include "sysemu/block-ram-registrar.h"
26#include "sysemu/sysemu.h"
27#include "sysemu/runstate.h"
28#include "hw/virtio/virtio-blk.h"
29#include "dataplane/virtio-blk.h"
30#include "scsi/constants.h"
31#ifdef __linux__
32# include <scsi/sg.h>
33#endif
34#include "hw/virtio/virtio-bus.h"
35#include "migration/qemu-file-types.h"
36#include "hw/virtio/virtio-access.h"
37#include "hw/virtio/virtio-blk-common.h"
38#include "qemu/coroutine.h"
39
40static void virtio_blk_init_request(VirtIOBlock *s, VirtQueue *vq,
41 VirtIOBlockReq *req)
42{
43 req->dev = s;
44 req->vq = vq;
45 req->qiov.size = 0;
46 req->in_len = 0;
47 req->next = NULL;
48 req->mr_next = NULL;
49}
50
51static void virtio_blk_free_request(VirtIOBlockReq *req)
52{
53 g_free(req);
54}
55
56static void virtio_blk_req_complete(VirtIOBlockReq *req, unsigned char status)
57{
58 VirtIOBlock *s = req->dev;
59 VirtIODevice *vdev = VIRTIO_DEVICE(s);
60
61 trace_virtio_blk_req_complete(vdev, req, status);
62
63 stb_p(&req->in->status, status);
64 iov_discard_undo(&req->inhdr_undo);
65 iov_discard_undo(&req->outhdr_undo);
66 virtqueue_push(req->vq, &req->elem, req->in_len);
67 if (s->dataplane_started && !s->dataplane_disabled) {
68 virtio_blk_data_plane_notify(s->dataplane, req->vq);
69 } else {
70 virtio_notify(vdev, req->vq);
71 }
72}
73
74static int virtio_blk_handle_rw_error(VirtIOBlockReq *req, int error,
75 bool is_read, bool acct_failed)
76{
77 VirtIOBlock *s = req->dev;
78 BlockErrorAction action = blk_get_error_action(s->blk, is_read, error);
79
80 if (action == BLOCK_ERROR_ACTION_STOP) {
81
82
83 req->mr_next = NULL;
84 req->next = s->rq;
85 s->rq = req;
86 } else if (action == BLOCK_ERROR_ACTION_REPORT) {
87 virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR);
88 if (acct_failed) {
89 block_acct_failed(blk_get_stats(s->blk), &req->acct);
90 }
91 virtio_blk_free_request(req);
92 }
93
94 blk_error_action(s->blk, action, is_read, error);
95 return action != BLOCK_ERROR_ACTION_IGNORE;
96}
97
98static void virtio_blk_rw_complete(void *opaque, int ret)
99{
100 VirtIOBlockReq *next = opaque;
101 VirtIOBlock *s = next->dev;
102 VirtIODevice *vdev = VIRTIO_DEVICE(s);
103
104 aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
105 while (next) {
106 VirtIOBlockReq *req = next;
107 next = req->mr_next;
108 trace_virtio_blk_rw_complete(vdev, req, ret);
109
110 if (req->qiov.nalloc != -1) {
111
112
113
114 qemu_iovec_destroy(&req->qiov);
115 }
116
117 if (ret) {
118 int p = virtio_ldl_p(VIRTIO_DEVICE(s), &req->out.type);
119 bool is_read = !(p & VIRTIO_BLK_T_OUT);
120
121
122
123
124
125
126
127
128 if (virtio_blk_handle_rw_error(req, -ret, is_read, true)) {
129 continue;
130 }
131 }
132
133 virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
134 block_acct_done(blk_get_stats(s->blk), &req->acct);
135 virtio_blk_free_request(req);
136 }
137 aio_context_release(blk_get_aio_context(s->conf.conf.blk));
138}
139
140static void virtio_blk_flush_complete(void *opaque, int ret)
141{
142 VirtIOBlockReq *req = opaque;
143 VirtIOBlock *s = req->dev;
144
145 aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
146 if (ret) {
147 if (virtio_blk_handle_rw_error(req, -ret, 0, true)) {
148 goto out;
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
156out:
157 aio_context_release(blk_get_aio_context(s->conf.conf.blk));
158}
159
160static void virtio_blk_discard_write_zeroes_complete(void *opaque, int ret)
161{
162 VirtIOBlockReq *req = opaque;
163 VirtIOBlock *s = req->dev;
164 bool is_write_zeroes = (virtio_ldl_p(VIRTIO_DEVICE(s), &req->out.type) &
165 ~VIRTIO_BLK_T_BARRIER) == VIRTIO_BLK_T_WRITE_ZEROES;
166
167 aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
168 if (ret) {
169 if (virtio_blk_handle_rw_error(req, -ret, false, is_write_zeroes)) {
170 goto out;
171 }
172 }
173
174 virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
175 if (is_write_zeroes) {
176 block_acct_done(blk_get_stats(s->blk), &req->acct);
177 }
178 virtio_blk_free_request(req);
179
180out:
181 aio_context_release(blk_get_aio_context(s->conf.conf.blk));
182}
183
184#ifdef __linux__
185
186typedef struct {
187 VirtIOBlockReq *req;
188 struct sg_io_hdr hdr;
189} VirtIOBlockIoctlReq;
190
191static void virtio_blk_ioctl_complete(void *opaque, int status)
192{
193 VirtIOBlockIoctlReq *ioctl_req = opaque;
194 VirtIOBlockReq *req = ioctl_req->req;
195 VirtIOBlock *s = req->dev;
196 VirtIODevice *vdev = VIRTIO_DEVICE(s);
197 struct virtio_scsi_inhdr *scsi;
198 struct sg_io_hdr *hdr;
199
200 scsi = (void *)req->elem.in_sg[req->elem.in_num - 2].iov_base;
201
202 if (status) {
203 status = VIRTIO_BLK_S_UNSUPP;
204 virtio_stl_p(vdev, &scsi->errors, 255);
205 goto out;
206 }
207
208 hdr = &ioctl_req->hdr;
209
210
211
212
213
214
215
216 if (hdr->status == 0 && hdr->sb_len_wr > 0) {
217 hdr->status = CHECK_CONDITION;
218 }
219
220 virtio_stl_p(vdev, &scsi->errors,
221 hdr->status | (hdr->msg_status << 8) |
222 (hdr->host_status << 16) | (hdr->driver_status << 24));
223 virtio_stl_p(vdev, &scsi->residual, hdr->resid);
224 virtio_stl_p(vdev, &scsi->sense_len, hdr->sb_len_wr);
225 virtio_stl_p(vdev, &scsi->data_len, hdr->dxfer_len);
226
227out:
228 aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
229 virtio_blk_req_complete(req, status);
230 virtio_blk_free_request(req);
231 aio_context_release(blk_get_aio_context(s->conf.conf.blk));
232 g_free(ioctl_req);
233}
234
235#endif
236
237static VirtIOBlockReq *virtio_blk_get_request(VirtIOBlock *s, VirtQueue *vq)
238{
239 VirtIOBlockReq *req = virtqueue_pop(vq, sizeof(VirtIOBlockReq));
240
241 if (req) {
242 virtio_blk_init_request(s, vq, req);
243 }
244 return req;
245}
246
247static int virtio_blk_handle_scsi_req(VirtIOBlockReq *req)
248{
249 int status = VIRTIO_BLK_S_OK;
250 struct virtio_scsi_inhdr *scsi = NULL;
251 VirtIOBlock *blk = req->dev;
252 VirtIODevice *vdev = VIRTIO_DEVICE(blk);
253 VirtQueueElement *elem = &req->elem;
254
255#ifdef __linux__
256 int i;
257 VirtIOBlockIoctlReq *ioctl_req;
258 BlockAIOCB *acb;
259#endif
260
261
262
263
264
265
266
267
268 if (elem->out_num < 2 || elem->in_num < 3) {
269 status = VIRTIO_BLK_S_IOERR;
270 goto fail;
271 }
272
273
274
275
276
277 scsi = (void *)elem->in_sg[elem->in_num - 2].iov_base;
278
279 if (!virtio_has_feature(blk->host_features, VIRTIO_BLK_F_SCSI)) {
280 status = VIRTIO_BLK_S_UNSUPP;
281 goto fail;
282 }
283
284
285
286
287 if (elem->out_num > 2 && elem->in_num > 3) {
288 status = VIRTIO_BLK_S_UNSUPP;
289 goto fail;
290 }
291
292#ifdef __linux__
293 ioctl_req = g_new0(VirtIOBlockIoctlReq, 1);
294 ioctl_req->req = req;
295 ioctl_req->hdr.interface_id = 'S';
296 ioctl_req->hdr.cmd_len = elem->out_sg[1].iov_len;
297 ioctl_req->hdr.cmdp = elem->out_sg[1].iov_base;
298 ioctl_req->hdr.dxfer_len = 0;
299
300 if (elem->out_num > 2) {
301
302
303
304
305 ioctl_req->hdr.dxfer_direction = SG_DXFER_TO_DEV;
306 ioctl_req->hdr.iovec_count = elem->out_num - 2;
307
308 for (i = 0; i < ioctl_req->hdr.iovec_count; i++) {
309 ioctl_req->hdr.dxfer_len += elem->out_sg[i + 2].iov_len;
310 }
311
312 ioctl_req->hdr.dxferp = elem->out_sg + 2;
313
314 } else if (elem->in_num > 3) {
315
316
317
318
319 ioctl_req->hdr.dxfer_direction = SG_DXFER_FROM_DEV;
320 ioctl_req->hdr.iovec_count = elem->in_num - 3;
321 for (i = 0; i < ioctl_req->hdr.iovec_count; i++) {
322 ioctl_req->hdr.dxfer_len += elem->in_sg[i].iov_len;
323 }
324
325 ioctl_req->hdr.dxferp = elem->in_sg;
326 } else {
327
328
329
330 ioctl_req->hdr.dxfer_direction = SG_DXFER_NONE;
331 }
332
333 ioctl_req->hdr.sbp = elem->in_sg[elem->in_num - 3].iov_base;
334 ioctl_req->hdr.mx_sb_len = elem->in_sg[elem->in_num - 3].iov_len;
335
336 acb = blk_aio_ioctl(blk->blk, SG_IO, &ioctl_req->hdr,
337 virtio_blk_ioctl_complete, ioctl_req);
338 if (!acb) {
339 g_free(ioctl_req);
340 status = VIRTIO_BLK_S_UNSUPP;
341 goto fail;
342 }
343 return -EINPROGRESS;
344#else
345 abort();
346#endif
347
348fail:
349
350 if (scsi) {
351 virtio_stl_p(vdev, &scsi->errors, 255);
352 }
353 return status;
354}
355
356static void virtio_blk_handle_scsi(VirtIOBlockReq *req)
357{
358 int status;
359
360 status = virtio_blk_handle_scsi_req(req);
361 if (status != -EINPROGRESS) {
362 virtio_blk_req_complete(req, status);
363 virtio_blk_free_request(req);
364 }
365}
366
367static inline void submit_requests(VirtIOBlock *s, MultiReqBuffer *mrb,
368 int start, int num_reqs, int niov)
369{
370 BlockBackend *blk = s->blk;
371 QEMUIOVector *qiov = &mrb->reqs[start]->qiov;
372 int64_t sector_num = mrb->reqs[start]->sector_num;
373 bool is_write = mrb->is_write;
374 BdrvRequestFlags flags = 0;
375
376 if (num_reqs > 1) {
377 int i;
378 struct iovec *tmp_iov = qiov->iov;
379 int tmp_niov = qiov->niov;
380
381
382
383
384 qemu_iovec_init(qiov, niov);
385
386 for (i = 0; i < tmp_niov; i++) {
387 qemu_iovec_add(qiov, tmp_iov[i].iov_base, tmp_iov[i].iov_len);
388 }
389
390 for (i = start + 1; i < start + num_reqs; i++) {
391 qemu_iovec_concat(qiov, &mrb->reqs[i]->qiov, 0,
392 mrb->reqs[i]->qiov.size);
393 mrb->reqs[i - 1]->mr_next = mrb->reqs[i];
394 }
395
396 trace_virtio_blk_submit_multireq(VIRTIO_DEVICE(mrb->reqs[start]->dev),
397 mrb, start, num_reqs,
398 sector_num << BDRV_SECTOR_BITS,
399 qiov->size, is_write);
400 block_acct_merge_done(blk_get_stats(blk),
401 is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ,
402 num_reqs - 1);
403 }
404
405 if (blk_ram_registrar_ok(&s->blk_ram_registrar)) {
406 flags |= BDRV_REQ_REGISTERED_BUF;
407 }
408
409 if (is_write) {
410 blk_aio_pwritev(blk, sector_num << BDRV_SECTOR_BITS, qiov,
411 flags, virtio_blk_rw_complete,
412 mrb->reqs[start]);
413 } else {
414 blk_aio_preadv(blk, sector_num << BDRV_SECTOR_BITS, qiov,
415 flags, virtio_blk_rw_complete,
416 mrb->reqs[start]);
417 }
418}
419
420static int multireq_compare(const void *a, const void *b)
421{
422 const VirtIOBlockReq *req1 = *(VirtIOBlockReq **)a,
423 *req2 = *(VirtIOBlockReq **)b;
424
425
426
427
428
429 if (req1->sector_num > req2->sector_num) {
430 return 1;
431 } else if (req1->sector_num < req2->sector_num) {
432 return -1;
433 } else {
434 return 0;
435 }
436}
437
438static void virtio_blk_submit_multireq(VirtIOBlock *s, MultiReqBuffer *mrb)
439{
440 int i = 0, start = 0, num_reqs = 0, niov = 0, nb_sectors = 0;
441 uint32_t max_transfer;
442 int64_t sector_num = 0;
443
444 if (mrb->num_reqs == 1) {
445 submit_requests(s, mrb, 0, 1, -1);
446 mrb->num_reqs = 0;
447 return;
448 }
449
450 max_transfer = blk_get_max_transfer(mrb->reqs[0]->dev->blk);
451
452 qsort(mrb->reqs, mrb->num_reqs, sizeof(*mrb->reqs),
453 &multireq_compare);
454
455 for (i = 0; i < mrb->num_reqs; i++) {
456 VirtIOBlockReq *req = mrb->reqs[i];
457 if (num_reqs > 0) {
458
459
460
461
462
463
464 if (sector_num + nb_sectors != req->sector_num ||
465 niov > blk_get_max_iov(s->blk) - req->qiov.niov ||
466 req->qiov.size > max_transfer ||
467 nb_sectors > (max_transfer -
468 req->qiov.size) / BDRV_SECTOR_SIZE) {
469 submit_requests(s, mrb, start, num_reqs, niov);
470 num_reqs = 0;
471 }
472 }
473
474 if (num_reqs == 0) {
475 sector_num = req->sector_num;
476 nb_sectors = niov = 0;
477 start = i;
478 }
479
480 nb_sectors += req->qiov.size / BDRV_SECTOR_SIZE;
481 niov += req->qiov.niov;
482 num_reqs++;
483 }
484
485 submit_requests(s, mrb, start, num_reqs, niov);
486 mrb->num_reqs = 0;
487}
488
489static void virtio_blk_handle_flush(VirtIOBlockReq *req, MultiReqBuffer *mrb)
490{
491 VirtIOBlock *s = req->dev;
492
493 block_acct_start(blk_get_stats(s->blk), &req->acct, 0,
494 BLOCK_ACCT_FLUSH);
495
496
497
498
499 if (mrb->is_write && mrb->num_reqs > 0) {
500 virtio_blk_submit_multireq(s, mrb);
501 }
502 blk_aio_flush(s->blk, virtio_blk_flush_complete, req);
503}
504
505static bool virtio_blk_sect_range_ok(VirtIOBlock *dev,
506 uint64_t sector, size_t size)
507{
508 uint64_t nb_sectors = size >> BDRV_SECTOR_BITS;
509 uint64_t total_sectors;
510
511 if (nb_sectors > BDRV_REQUEST_MAX_SECTORS) {
512 return false;
513 }
514 if (sector & dev->sector_mask) {
515 return false;
516 }
517 if (size % dev->conf.conf.logical_block_size) {
518 return false;
519 }
520 blk_get_geometry(dev->blk, &total_sectors);
521 if (sector > total_sectors || nb_sectors > total_sectors - sector) {
522 return false;
523 }
524 return true;
525}
526
527static uint8_t virtio_blk_handle_discard_write_zeroes(VirtIOBlockReq *req,
528 struct virtio_blk_discard_write_zeroes *dwz_hdr, bool is_write_zeroes)
529{
530 VirtIOBlock *s = req->dev;
531 VirtIODevice *vdev = VIRTIO_DEVICE(s);
532 uint64_t sector;
533 uint32_t num_sectors, flags, max_sectors;
534 uint8_t err_status;
535 int bytes;
536
537 sector = virtio_ldq_p(vdev, &dwz_hdr->sector);
538 num_sectors = virtio_ldl_p(vdev, &dwz_hdr->num_sectors);
539 flags = virtio_ldl_p(vdev, &dwz_hdr->flags);
540 max_sectors = is_write_zeroes ? s->conf.max_write_zeroes_sectors :
541 s->conf.max_discard_sectors;
542
543
544
545
546
547
548 if (unlikely(num_sectors > max_sectors)) {
549 err_status = VIRTIO_BLK_S_IOERR;
550 goto err;
551 }
552
553 bytes = num_sectors << BDRV_SECTOR_BITS;
554
555 if (unlikely(!virtio_blk_sect_range_ok(s, sector, bytes))) {
556 err_status = VIRTIO_BLK_S_IOERR;
557 goto err;
558 }
559
560
561
562
563
564 if (unlikely(flags & ~VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP)) {
565 err_status = VIRTIO_BLK_S_UNSUPP;
566 goto err;
567 }
568
569 if (is_write_zeroes) {
570 int blk_aio_flags = 0;
571
572 if (flags & VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP) {
573 blk_aio_flags |= BDRV_REQ_MAY_UNMAP;
574 }
575
576 block_acct_start(blk_get_stats(s->blk), &req->acct, bytes,
577 BLOCK_ACCT_WRITE);
578
579 blk_aio_pwrite_zeroes(s->blk, sector << BDRV_SECTOR_BITS,
580 bytes, blk_aio_flags,
581 virtio_blk_discard_write_zeroes_complete, req);
582 } else {
583
584
585
586
587 if (unlikely(flags & VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP)) {
588 err_status = VIRTIO_BLK_S_UNSUPP;
589 goto err;
590 }
591
592 blk_aio_pdiscard(s->blk, sector << BDRV_SECTOR_BITS, bytes,
593 virtio_blk_discard_write_zeroes_complete, req);
594 }
595
596 return VIRTIO_BLK_S_OK;
597
598err:
599 if (is_write_zeroes) {
600 block_acct_invalid(blk_get_stats(s->blk), BLOCK_ACCT_WRITE);
601 }
602 return err_status;
603}
604
605typedef struct ZoneCmdData {
606 VirtIOBlockReq *req;
607 struct iovec *in_iov;
608 unsigned in_num;
609 union {
610 struct {
611 unsigned int nr_zones;
612 BlockZoneDescriptor *zones;
613 } zone_report_data;
614 struct {
615 int64_t offset;
616 } zone_append_data;
617 };
618} ZoneCmdData;
619
620
621
622
623
624
625static bool check_zoned_request(VirtIOBlock *s, int64_t offset, int64_t len,
626 bool append, uint8_t *status) {
627 BlockDriverState *bs = blk_bs(s->blk);
628 int index;
629
630 if (!virtio_has_feature(s->host_features, VIRTIO_BLK_F_ZONED)) {
631 *status = VIRTIO_BLK_S_UNSUPP;
632 return false;
633 }
634
635 if (offset < 0 || len < 0 || len > (bs->total_sectors << BDRV_SECTOR_BITS)
636 || offset > (bs->total_sectors << BDRV_SECTOR_BITS) - len) {
637 *status = VIRTIO_BLK_S_ZONE_INVALID_CMD;
638 return false;
639 }
640
641 if (append) {
642 if (bs->bl.write_granularity) {
643 if ((offset % bs->bl.write_granularity) != 0) {
644 *status = VIRTIO_BLK_S_ZONE_UNALIGNED_WP;
645 return false;
646 }
647 }
648
649 index = offset / bs->bl.zone_size;
650 if (BDRV_ZT_IS_CONV(bs->wps->wp[index])) {
651 *status = VIRTIO_BLK_S_ZONE_INVALID_CMD;
652 return false;
653 }
654
655 if (len / 512 > bs->bl.max_append_sectors) {
656 if (bs->bl.max_append_sectors == 0) {
657 *status = VIRTIO_BLK_S_UNSUPP;
658 } else {
659 *status = VIRTIO_BLK_S_ZONE_INVALID_CMD;
660 }
661 return false;
662 }
663 }
664 return true;
665}
666
667static void virtio_blk_zone_report_complete(void *opaque, int ret)
668{
669 ZoneCmdData *data = opaque;
670 VirtIOBlockReq *req = data->req;
671 VirtIOBlock *s = req->dev;
672 VirtIODevice *vdev = VIRTIO_DEVICE(req->dev);
673 struct iovec *in_iov = data->in_iov;
674 unsigned in_num = data->in_num;
675 int64_t zrp_size, n, j = 0;
676 int64_t nz = data->zone_report_data.nr_zones;
677 int8_t err_status = VIRTIO_BLK_S_OK;
678
679 trace_virtio_blk_zone_report_complete(vdev, req, nz, ret);
680 if (ret) {
681 err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD;
682 goto out;
683 }
684
685 struct virtio_blk_zone_report zrp_hdr = (struct virtio_blk_zone_report) {
686 .nr_zones = cpu_to_le64(nz),
687 };
688 zrp_size = sizeof(struct virtio_blk_zone_report)
689 + sizeof(struct virtio_blk_zone_descriptor) * nz;
690 n = iov_from_buf(in_iov, in_num, 0, &zrp_hdr, sizeof(zrp_hdr));
691 if (n != sizeof(zrp_hdr)) {
692 virtio_error(vdev, "Driver provided input buffer that is too small!");
693 err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD;
694 goto out;
695 }
696
697 for (size_t i = sizeof(zrp_hdr); i < zrp_size;
698 i += sizeof(struct virtio_blk_zone_descriptor), ++j) {
699 struct virtio_blk_zone_descriptor desc =
700 (struct virtio_blk_zone_descriptor) {
701 .z_start = cpu_to_le64(data->zone_report_data.zones[j].start
702 >> BDRV_SECTOR_BITS),
703 .z_cap = cpu_to_le64(data->zone_report_data.zones[j].cap
704 >> BDRV_SECTOR_BITS),
705 .z_wp = cpu_to_le64(data->zone_report_data.zones[j].wp
706 >> BDRV_SECTOR_BITS),
707 };
708
709 switch (data->zone_report_data.zones[j].type) {
710 case BLK_ZT_CONV:
711 desc.z_type = VIRTIO_BLK_ZT_CONV;
712 break;
713 case BLK_ZT_SWR:
714 desc.z_type = VIRTIO_BLK_ZT_SWR;
715 break;
716 case BLK_ZT_SWP:
717 desc.z_type = VIRTIO_BLK_ZT_SWP;
718 break;
719 default:
720 g_assert_not_reached();
721 }
722
723 switch (data->zone_report_data.zones[j].state) {
724 case BLK_ZS_RDONLY:
725 desc.z_state = VIRTIO_BLK_ZS_RDONLY;
726 break;
727 case BLK_ZS_OFFLINE:
728 desc.z_state = VIRTIO_BLK_ZS_OFFLINE;
729 break;
730 case BLK_ZS_EMPTY:
731 desc.z_state = VIRTIO_BLK_ZS_EMPTY;
732 break;
733 case BLK_ZS_CLOSED:
734 desc.z_state = VIRTIO_BLK_ZS_CLOSED;
735 break;
736 case BLK_ZS_FULL:
737 desc.z_state = VIRTIO_BLK_ZS_FULL;
738 break;
739 case BLK_ZS_EOPEN:
740 desc.z_state = VIRTIO_BLK_ZS_EOPEN;
741 break;
742 case BLK_ZS_IOPEN:
743 desc.z_state = VIRTIO_BLK_ZS_IOPEN;
744 break;
745 case BLK_ZS_NOT_WP:
746 desc.z_state = VIRTIO_BLK_ZS_NOT_WP;
747 break;
748 default:
749 g_assert_not_reached();
750 }
751
752
753 n = iov_from_buf(in_iov, in_num, i, &desc, sizeof(desc));
754 if (n != sizeof(desc)) {
755 virtio_error(vdev, "Driver provided input buffer "
756 "for descriptors that is too small!");
757 err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD;
758 }
759 }
760
761out:
762 aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
763 virtio_blk_req_complete(req, err_status);
764 virtio_blk_free_request(req);
765 aio_context_release(blk_get_aio_context(s->conf.conf.blk));
766 g_free(data->zone_report_data.zones);
767 g_free(data);
768}
769
770static void virtio_blk_handle_zone_report(VirtIOBlockReq *req,
771 struct iovec *in_iov,
772 unsigned in_num)
773{
774 VirtIOBlock *s = req->dev;
775 VirtIODevice *vdev = VIRTIO_DEVICE(s);
776 unsigned int nr_zones;
777 ZoneCmdData *data;
778 int64_t zone_size, offset;
779 uint8_t err_status;
780
781 if (req->in_len < sizeof(struct virtio_blk_inhdr) +
782 sizeof(struct virtio_blk_zone_report) +
783 sizeof(struct virtio_blk_zone_descriptor)) {
784 virtio_error(vdev, "in buffer too small for zone report");
785 return;
786 }
787
788
789 offset = virtio_ldq_p(vdev, &req->out.sector) << BDRV_SECTOR_BITS;
790 if (!check_zoned_request(s, offset, 0, false, &err_status)) {
791 goto out;
792 }
793 nr_zones = (req->in_len - sizeof(struct virtio_blk_inhdr) -
794 sizeof(struct virtio_blk_zone_report)) /
795 sizeof(struct virtio_blk_zone_descriptor);
796 trace_virtio_blk_handle_zone_report(vdev, req,
797 offset >> BDRV_SECTOR_BITS, nr_zones);
798
799 zone_size = sizeof(BlockZoneDescriptor) * nr_zones;
800 data = g_malloc(sizeof(ZoneCmdData));
801 data->req = req;
802 data->in_iov = in_iov;
803 data->in_num = in_num;
804 data->zone_report_data.nr_zones = nr_zones;
805 data->zone_report_data.zones = g_malloc(zone_size),
806
807 blk_aio_zone_report(s->blk, offset, &data->zone_report_data.nr_zones,
808 data->zone_report_data.zones,
809 virtio_blk_zone_report_complete, data);
810 return;
811out:
812 virtio_blk_req_complete(req, err_status);
813 virtio_blk_free_request(req);
814}
815
816static void virtio_blk_zone_mgmt_complete(void *opaque, int ret)
817{
818 VirtIOBlockReq *req = opaque;
819 VirtIOBlock *s = req->dev;
820 VirtIODevice *vdev = VIRTIO_DEVICE(s);
821 int8_t err_status = VIRTIO_BLK_S_OK;
822 trace_virtio_blk_zone_mgmt_complete(vdev, req,ret);
823
824 if (ret) {
825 err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD;
826 }
827
828 aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
829 virtio_blk_req_complete(req, err_status);
830 virtio_blk_free_request(req);
831 aio_context_release(blk_get_aio_context(s->conf.conf.blk));
832}
833
834static int virtio_blk_handle_zone_mgmt(VirtIOBlockReq *req, BlockZoneOp op)
835{
836 VirtIOBlock *s = req->dev;
837 VirtIODevice *vdev = VIRTIO_DEVICE(s);
838 BlockDriverState *bs = blk_bs(s->blk);
839 int64_t offset = virtio_ldq_p(vdev, &req->out.sector) << BDRV_SECTOR_BITS;
840 uint64_t len;
841 uint64_t capacity = bs->total_sectors << BDRV_SECTOR_BITS;
842 uint8_t err_status = VIRTIO_BLK_S_OK;
843
844 uint32_t type = virtio_ldl_p(vdev, &req->out.type);
845 if (type == VIRTIO_BLK_T_ZONE_RESET_ALL) {
846
847 offset = 0;
848 len = capacity;
849 trace_virtio_blk_handle_zone_reset_all(vdev, req, 0,
850 bs->total_sectors);
851 } else {
852 if (bs->bl.zone_size > capacity - offset) {
853
854 len = capacity - bs->bl.zone_size * (bs->bl.nr_zones - 1);
855 } else {
856 len = bs->bl.zone_size;
857 }
858 trace_virtio_blk_handle_zone_mgmt(vdev, req, op,
859 offset >> BDRV_SECTOR_BITS,
860 len >> BDRV_SECTOR_BITS);
861 }
862
863 if (!check_zoned_request(s, offset, len, false, &err_status)) {
864 goto out;
865 }
866
867 blk_aio_zone_mgmt(s->blk, op, offset, len,
868 virtio_blk_zone_mgmt_complete, req);
869
870 return 0;
871out:
872 virtio_blk_req_complete(req, err_status);
873 virtio_blk_free_request(req);
874 return err_status;
875}
876
877static void virtio_blk_zone_append_complete(void *opaque, int ret)
878{
879 ZoneCmdData *data = opaque;
880 VirtIOBlockReq *req = data->req;
881 VirtIOBlock *s = req->dev;
882 VirtIODevice *vdev = VIRTIO_DEVICE(req->dev);
883 int64_t append_sector, n;
884 uint8_t err_status = VIRTIO_BLK_S_OK;
885
886 if (ret) {
887 err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD;
888 goto out;
889 }
890
891 virtio_stq_p(vdev, &append_sector,
892 data->zone_append_data.offset >> BDRV_SECTOR_BITS);
893 n = iov_from_buf(data->in_iov, data->in_num, 0, &append_sector,
894 sizeof(append_sector));
895 if (n != sizeof(append_sector)) {
896 virtio_error(vdev, "Driver provided input buffer less than size of "
897 "append_sector");
898 err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD;
899 goto out;
900 }
901 trace_virtio_blk_zone_append_complete(vdev, req, append_sector, ret);
902
903out:
904 aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
905 virtio_blk_req_complete(req, err_status);
906 virtio_blk_free_request(req);
907 aio_context_release(blk_get_aio_context(s->conf.conf.blk));
908 g_free(data);
909}
910
911static int virtio_blk_handle_zone_append(VirtIOBlockReq *req,
912 struct iovec *out_iov,
913 struct iovec *in_iov,
914 uint64_t out_num,
915 unsigned in_num) {
916 VirtIOBlock *s = req->dev;
917 VirtIODevice *vdev = VIRTIO_DEVICE(s);
918 uint8_t err_status = VIRTIO_BLK_S_OK;
919
920 int64_t offset = virtio_ldq_p(vdev, &req->out.sector) << BDRV_SECTOR_BITS;
921 int64_t len = iov_size(out_iov, out_num);
922
923 trace_virtio_blk_handle_zone_append(vdev, req, offset >> BDRV_SECTOR_BITS);
924 if (!check_zoned_request(s, offset, len, true, &err_status)) {
925 goto out;
926 }
927
928 ZoneCmdData *data = g_malloc(sizeof(ZoneCmdData));
929 data->req = req;
930 data->in_iov = in_iov;
931 data->in_num = in_num;
932 data->zone_append_data.offset = offset;
933 qemu_iovec_init_external(&req->qiov, out_iov, out_num);
934
935 block_acct_start(blk_get_stats(s->blk), &req->acct, len,
936 BLOCK_ACCT_ZONE_APPEND);
937
938 blk_aio_zone_append(s->blk, &data->zone_append_data.offset, &req->qiov, 0,
939 virtio_blk_zone_append_complete, data);
940 return 0;
941
942out:
943 aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
944 virtio_blk_req_complete(req, err_status);
945 virtio_blk_free_request(req);
946 aio_context_release(blk_get_aio_context(s->conf.conf.blk));
947 return err_status;
948}
949
950static int virtio_blk_handle_request(VirtIOBlockReq *req, MultiReqBuffer *mrb)
951{
952 uint32_t type;
953 struct iovec *in_iov = req->elem.in_sg;
954 struct iovec *out_iov = req->elem.out_sg;
955 unsigned in_num = req->elem.in_num;
956 unsigned out_num = req->elem.out_num;
957 VirtIOBlock *s = req->dev;
958 VirtIODevice *vdev = VIRTIO_DEVICE(s);
959
960 if (req->elem.out_num < 1 || req->elem.in_num < 1) {
961 virtio_error(vdev, "virtio-blk missing headers");
962 return -1;
963 }
964
965 if (unlikely(iov_to_buf(out_iov, out_num, 0, &req->out,
966 sizeof(req->out)) != sizeof(req->out))) {
967 virtio_error(vdev, "virtio-blk request outhdr too short");
968 return -1;
969 }
970
971 iov_discard_front_undoable(&out_iov, &out_num, sizeof(req->out),
972 &req->outhdr_undo);
973
974 if (in_iov[in_num - 1].iov_len < sizeof(struct virtio_blk_inhdr)) {
975 virtio_error(vdev, "virtio-blk request inhdr too short");
976 iov_discard_undo(&req->outhdr_undo);
977 return -1;
978 }
979
980
981 req->in_len = iov_size(in_iov, in_num);
982 req->in = (void *)in_iov[in_num - 1].iov_base
983 + in_iov[in_num - 1].iov_len
984 - sizeof(struct virtio_blk_inhdr);
985 iov_discard_back_undoable(in_iov, &in_num, sizeof(struct virtio_blk_inhdr),
986 &req->inhdr_undo);
987
988 type = virtio_ldl_p(vdev, &req->out.type);
989
990
991
992
993 switch (type & ~(VIRTIO_BLK_T_OUT | VIRTIO_BLK_T_BARRIER)) {
994 case VIRTIO_BLK_T_IN:
995 {
996 bool is_write = type & VIRTIO_BLK_T_OUT;
997 req->sector_num = virtio_ldq_p(vdev, &req->out.sector);
998
999 if (is_write) {
1000 qemu_iovec_init_external(&req->qiov, out_iov, out_num);
1001 trace_virtio_blk_handle_write(vdev, req, req->sector_num,
1002 req->qiov.size / BDRV_SECTOR_SIZE);
1003 } else {
1004 qemu_iovec_init_external(&req->qiov, in_iov, in_num);
1005 trace_virtio_blk_handle_read(vdev, req, req->sector_num,
1006 req->qiov.size / BDRV_SECTOR_SIZE);
1007 }
1008
1009 if (!virtio_blk_sect_range_ok(s, req->sector_num, req->qiov.size)) {
1010 virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR);
1011 block_acct_invalid(blk_get_stats(s->blk),
1012 is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ);
1013 virtio_blk_free_request(req);
1014 return 0;
1015 }
1016
1017 block_acct_start(blk_get_stats(s->blk), &req->acct, req->qiov.size,
1018 is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ);
1019
1020
1021
1022 if (mrb->num_reqs > 0 && (mrb->num_reqs == VIRTIO_BLK_MAX_MERGE_REQS ||
1023 is_write != mrb->is_write ||
1024 !s->conf.request_merging)) {
1025 virtio_blk_submit_multireq(s, mrb);
1026 }
1027
1028 assert(mrb->num_reqs < VIRTIO_BLK_MAX_MERGE_REQS);
1029 mrb->reqs[mrb->num_reqs++] = req;
1030 mrb->is_write = is_write;
1031 break;
1032 }
1033 case VIRTIO_BLK_T_FLUSH:
1034 virtio_blk_handle_flush(req, mrb);
1035 break;
1036 case VIRTIO_BLK_T_ZONE_REPORT:
1037 virtio_blk_handle_zone_report(req, in_iov, in_num);
1038 break;
1039 case VIRTIO_BLK_T_ZONE_OPEN:
1040 virtio_blk_handle_zone_mgmt(req, BLK_ZO_OPEN);
1041 break;
1042 case VIRTIO_BLK_T_ZONE_CLOSE:
1043 virtio_blk_handle_zone_mgmt(req, BLK_ZO_CLOSE);
1044 break;
1045 case VIRTIO_BLK_T_ZONE_FINISH:
1046 virtio_blk_handle_zone_mgmt(req, BLK_ZO_FINISH);
1047 break;
1048 case VIRTIO_BLK_T_ZONE_RESET:
1049 virtio_blk_handle_zone_mgmt(req, BLK_ZO_RESET);
1050 break;
1051 case VIRTIO_BLK_T_ZONE_RESET_ALL:
1052 virtio_blk_handle_zone_mgmt(req, BLK_ZO_RESET);
1053 break;
1054 case VIRTIO_BLK_T_SCSI_CMD:
1055 virtio_blk_handle_scsi(req);
1056 break;
1057 case VIRTIO_BLK_T_GET_ID:
1058 {
1059
1060
1061
1062
1063 const char *serial = s->conf.serial ? s->conf.serial : "";
1064 size_t size = MIN(strlen(serial) + 1,
1065 MIN(iov_size(in_iov, in_num),
1066 VIRTIO_BLK_ID_BYTES));
1067 iov_from_buf(in_iov, in_num, 0, serial, size);
1068 virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
1069 virtio_blk_free_request(req);
1070 break;
1071 }
1072 case VIRTIO_BLK_T_ZONE_APPEND & ~VIRTIO_BLK_T_OUT:
1073
1074
1075
1076
1077
1078 virtio_blk_handle_zone_append(req, out_iov, in_iov, out_num, in_num);
1079 break;
1080
1081
1082
1083
1084
1085 case VIRTIO_BLK_T_DISCARD & ~VIRTIO_BLK_T_OUT:
1086 case VIRTIO_BLK_T_WRITE_ZEROES & ~VIRTIO_BLK_T_OUT:
1087 {
1088 struct virtio_blk_discard_write_zeroes dwz_hdr;
1089 size_t out_len = iov_size(out_iov, out_num);
1090 bool is_write_zeroes = (type & ~VIRTIO_BLK_T_BARRIER) ==
1091 VIRTIO_BLK_T_WRITE_ZEROES;
1092 uint8_t err_status;
1093
1094
1095
1096
1097
1098 if (unlikely(!(type & VIRTIO_BLK_T_OUT) ||
1099 out_len > sizeof(dwz_hdr))) {
1100 virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP);
1101 virtio_blk_free_request(req);
1102 return 0;
1103 }
1104
1105 if (unlikely(iov_to_buf(out_iov, out_num, 0, &dwz_hdr,
1106 sizeof(dwz_hdr)) != sizeof(dwz_hdr))) {
1107 iov_discard_undo(&req->inhdr_undo);
1108 iov_discard_undo(&req->outhdr_undo);
1109 virtio_error(vdev, "virtio-blk discard/write_zeroes header"
1110 " too short");
1111 return -1;
1112 }
1113
1114 err_status = virtio_blk_handle_discard_write_zeroes(req, &dwz_hdr,
1115 is_write_zeroes);
1116 if (err_status != VIRTIO_BLK_S_OK) {
1117 virtio_blk_req_complete(req, err_status);
1118 virtio_blk_free_request(req);
1119 }
1120
1121 break;
1122 }
1123 default:
1124 virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP);
1125 virtio_blk_free_request(req);
1126 }
1127 return 0;
1128}
1129
1130void virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq)
1131{
1132 VirtIOBlockReq *req;
1133 MultiReqBuffer mrb = {};
1134 bool suppress_notifications = virtio_queue_get_notification(vq);
1135
1136 aio_context_acquire(blk_get_aio_context(s->blk));
1137 blk_io_plug();
1138
1139 do {
1140 if (suppress_notifications) {
1141 virtio_queue_set_notification(vq, 0);
1142 }
1143
1144 while ((req = virtio_blk_get_request(s, vq))) {
1145 if (virtio_blk_handle_request(req, &mrb)) {
1146 virtqueue_detach_element(req->vq, &req->elem, 0);
1147 virtio_blk_free_request(req);
1148 break;
1149 }
1150 }
1151
1152 if (suppress_notifications) {
1153 virtio_queue_set_notification(vq, 1);
1154 }
1155 } while (!virtio_queue_empty(vq));
1156
1157 if (mrb.num_reqs) {
1158 virtio_blk_submit_multireq(s, &mrb);
1159 }
1160
1161 blk_io_unplug();
1162 aio_context_release(blk_get_aio_context(s->blk));
1163}
1164
1165static void virtio_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq)
1166{
1167 VirtIOBlock *s = (VirtIOBlock *)vdev;
1168
1169 if (s->dataplane && !s->dataplane_started) {
1170
1171
1172
1173 virtio_device_start_ioeventfd(vdev);
1174 if (!s->dataplane_disabled) {
1175 return;
1176 }
1177 }
1178 virtio_blk_handle_vq(s, vq);
1179}
1180
1181static void virtio_blk_dma_restart_bh(void *opaque)
1182{
1183 VirtIOBlock *s = opaque;
1184
1185 VirtIOBlockReq *req = s->rq;
1186 MultiReqBuffer mrb = {};
1187
1188 s->rq = NULL;
1189
1190 aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
1191 while (req) {
1192 VirtIOBlockReq *next = req->next;
1193 if (virtio_blk_handle_request(req, &mrb)) {
1194
1195
1196
1197 while (req) {
1198 next = req->next;
1199 virtqueue_detach_element(req->vq, &req->elem, 0);
1200 virtio_blk_free_request(req);
1201 req = next;
1202 }
1203 break;
1204 }
1205 req = next;
1206 }
1207
1208 if (mrb.num_reqs) {
1209 virtio_blk_submit_multireq(s, &mrb);
1210 }
1211
1212
1213 blk_dec_in_flight(s->conf.conf.blk);
1214
1215 aio_context_release(blk_get_aio_context(s->conf.conf.blk));
1216}
1217
1218static void virtio_blk_dma_restart_cb(void *opaque, bool running,
1219 RunState state)
1220{
1221 VirtIOBlock *s = opaque;
1222
1223 if (!running) {
1224 return;
1225 }
1226
1227
1228 blk_inc_in_flight(s->conf.conf.blk);
1229
1230 aio_bh_schedule_oneshot(blk_get_aio_context(s->conf.conf.blk),
1231 virtio_blk_dma_restart_bh, s);
1232}
1233
1234static void virtio_blk_reset(VirtIODevice *vdev)
1235{
1236 VirtIOBlock *s = VIRTIO_BLK(vdev);
1237 AioContext *ctx;
1238 VirtIOBlockReq *req;
1239
1240 ctx = blk_get_aio_context(s->blk);
1241 aio_context_acquire(ctx);
1242 blk_drain(s->blk);
1243
1244
1245
1246 while (s->rq) {
1247 req = s->rq;
1248 s->rq = req->next;
1249 virtqueue_detach_element(req->vq, &req->elem, 0);
1250 virtio_blk_free_request(req);
1251 }
1252
1253 aio_context_release(ctx);
1254
1255 assert(!s->dataplane_started);
1256 blk_set_enable_write_cache(s->blk, s->original_wce);
1257}
1258
1259
1260
1261static void virtio_blk_update_config(VirtIODevice *vdev, uint8_t *config)
1262{
1263 VirtIOBlock *s = VIRTIO_BLK(vdev);
1264 BlockConf *conf = &s->conf.conf;
1265 BlockDriverState *bs = blk_bs(s->blk);
1266 struct virtio_blk_config blkcfg;
1267 uint64_t capacity;
1268 int64_t length;
1269 int blk_size = conf->logical_block_size;
1270 AioContext *ctx;
1271
1272 ctx = blk_get_aio_context(s->blk);
1273 aio_context_acquire(ctx);
1274
1275 blk_get_geometry(s->blk, &capacity);
1276 memset(&blkcfg, 0, sizeof(blkcfg));
1277 virtio_stq_p(vdev, &blkcfg.capacity, capacity);
1278 virtio_stl_p(vdev, &blkcfg.seg_max,
1279 s->conf.seg_max_adjust ? s->conf.queue_size - 2 : 128 - 2);
1280 virtio_stw_p(vdev, &blkcfg.geometry.cylinders, conf->cyls);
1281 virtio_stl_p(vdev, &blkcfg.blk_size, blk_size);
1282 virtio_stw_p(vdev, &blkcfg.min_io_size, conf->min_io_size / blk_size);
1283 virtio_stl_p(vdev, &blkcfg.opt_io_size, conf->opt_io_size / blk_size);
1284 blkcfg.geometry.heads = conf->heads;
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296 length = blk_getlength(s->blk);
1297 aio_context_release(ctx);
1298 if (length > 0 && length / conf->heads / conf->secs % blk_size) {
1299 blkcfg.geometry.sectors = conf->secs & ~s->sector_mask;
1300 } else {
1301 blkcfg.geometry.sectors = conf->secs;
1302 }
1303 blkcfg.size_max = 0;
1304 blkcfg.physical_block_exp = get_physical_block_exp(conf);
1305 blkcfg.alignment_offset = 0;
1306 blkcfg.wce = blk_enable_write_cache(s->blk);
1307 virtio_stw_p(vdev, &blkcfg.num_queues, s->conf.num_queues);
1308 if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_DISCARD)) {
1309 uint32_t discard_granularity = conf->discard_granularity;
1310 if (discard_granularity == -1 || !s->conf.report_discard_granularity) {
1311 discard_granularity = blk_size;
1312 }
1313 virtio_stl_p(vdev, &blkcfg.max_discard_sectors,
1314 s->conf.max_discard_sectors);
1315 virtio_stl_p(vdev, &blkcfg.discard_sector_alignment,
1316 discard_granularity >> BDRV_SECTOR_BITS);
1317
1318
1319
1320
1321
1322 virtio_stl_p(vdev, &blkcfg.max_discard_seg, 1);
1323 }
1324 if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_WRITE_ZEROES)) {
1325 virtio_stl_p(vdev, &blkcfg.max_write_zeroes_sectors,
1326 s->conf.max_write_zeroes_sectors);
1327 blkcfg.write_zeroes_may_unmap = 1;
1328 virtio_stl_p(vdev, &blkcfg.max_write_zeroes_seg, 1);
1329 }
1330 if (bs->bl.zoned != BLK_Z_NONE) {
1331 switch (bs->bl.zoned) {
1332 case BLK_Z_HM:
1333 blkcfg.zoned.model = VIRTIO_BLK_Z_HM;
1334 break;
1335 case BLK_Z_HA:
1336 blkcfg.zoned.model = VIRTIO_BLK_Z_HA;
1337 break;
1338 default:
1339 g_assert_not_reached();
1340 }
1341
1342 virtio_stl_p(vdev, &blkcfg.zoned.zone_sectors,
1343 bs->bl.zone_size / 512);
1344 virtio_stl_p(vdev, &blkcfg.zoned.max_active_zones,
1345 bs->bl.max_active_zones);
1346 virtio_stl_p(vdev, &blkcfg.zoned.max_open_zones,
1347 bs->bl.max_open_zones);
1348 virtio_stl_p(vdev, &blkcfg.zoned.write_granularity, blk_size);
1349 virtio_stl_p(vdev, &blkcfg.zoned.max_append_sectors,
1350 bs->bl.max_append_sectors);
1351 } else {
1352 blkcfg.zoned.model = VIRTIO_BLK_Z_NONE;
1353 }
1354 memcpy(config, &blkcfg, s->config_size);
1355}
1356
1357static void virtio_blk_set_config(VirtIODevice *vdev, const uint8_t *config)
1358{
1359 VirtIOBlock *s = VIRTIO_BLK(vdev);
1360 struct virtio_blk_config blkcfg;
1361
1362 memcpy(&blkcfg, config, s->config_size);
1363
1364 aio_context_acquire(blk_get_aio_context(s->blk));
1365 blk_set_enable_write_cache(s->blk, blkcfg.wce != 0);
1366 aio_context_release(blk_get_aio_context(s->blk));
1367}
1368
1369static uint64_t virtio_blk_get_features(VirtIODevice *vdev, uint64_t features,
1370 Error **errp)
1371{
1372 VirtIOBlock *s = VIRTIO_BLK(vdev);
1373
1374
1375 features |= s->host_features;
1376
1377 virtio_add_feature(&features, VIRTIO_BLK_F_SEG_MAX);
1378 virtio_add_feature(&features, VIRTIO_BLK_F_GEOMETRY);
1379 virtio_add_feature(&features, VIRTIO_BLK_F_TOPOLOGY);
1380 virtio_add_feature(&features, VIRTIO_BLK_F_BLK_SIZE);
1381 if (virtio_has_feature(features, VIRTIO_F_VERSION_1)) {
1382 if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_SCSI)) {
1383 error_setg(errp, "Please set scsi=off for virtio-blk devices in order to use virtio 1.0");
1384 return 0;
1385 }
1386 } else {
1387 virtio_clear_feature(&features, VIRTIO_F_ANY_LAYOUT);
1388 virtio_add_feature(&features, VIRTIO_BLK_F_SCSI);
1389 }
1390
1391 if (blk_enable_write_cache(s->blk) ||
1392 (s->conf.x_enable_wce_if_config_wce &&
1393 virtio_has_feature(features, VIRTIO_BLK_F_CONFIG_WCE))) {
1394 virtio_add_feature(&features, VIRTIO_BLK_F_WCE);
1395 }
1396 if (!blk_is_writable(s->blk)) {
1397 virtio_add_feature(&features, VIRTIO_BLK_F_RO);
1398 }
1399 if (s->conf.num_queues > 1) {
1400 virtio_add_feature(&features, VIRTIO_BLK_F_MQ);
1401 }
1402
1403 return features;
1404}
1405
1406static void virtio_blk_set_status(VirtIODevice *vdev, uint8_t status)
1407{
1408 VirtIOBlock *s = VIRTIO_BLK(vdev);
1409
1410 if (!(status & (VIRTIO_CONFIG_S_DRIVER | VIRTIO_CONFIG_S_DRIVER_OK))) {
1411 assert(!s->dataplane_started);
1412 }
1413
1414 if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
1415 return;
1416 }
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433 if (!virtio_vdev_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE)) {
1434 aio_context_acquire(blk_get_aio_context(s->blk));
1435 blk_set_enable_write_cache(s->blk,
1436 virtio_vdev_has_feature(vdev,
1437 VIRTIO_BLK_F_WCE));
1438 aio_context_release(blk_get_aio_context(s->blk));
1439 }
1440}
1441
1442static void virtio_blk_save_device(VirtIODevice *vdev, QEMUFile *f)
1443{
1444 VirtIOBlock *s = VIRTIO_BLK(vdev);
1445 VirtIOBlockReq *req = s->rq;
1446
1447 while (req) {
1448 qemu_put_sbyte(f, 1);
1449
1450 if (s->conf.num_queues > 1) {
1451 qemu_put_be32(f, virtio_get_queue_index(req->vq));
1452 }
1453
1454 qemu_put_virtqueue_element(vdev, f, &req->elem);
1455 req = req->next;
1456 }
1457 qemu_put_sbyte(f, 0);
1458}
1459
1460static int virtio_blk_load_device(VirtIODevice *vdev, QEMUFile *f,
1461 int version_id)
1462{
1463 VirtIOBlock *s = VIRTIO_BLK(vdev);
1464
1465 while (qemu_get_sbyte(f)) {
1466 unsigned nvqs = s->conf.num_queues;
1467 unsigned vq_idx = 0;
1468 VirtIOBlockReq *req;
1469
1470 if (nvqs > 1) {
1471 vq_idx = qemu_get_be32(f);
1472
1473 if (vq_idx >= nvqs) {
1474 error_report("Invalid virtqueue index in request list: %#x",
1475 vq_idx);
1476 return -EINVAL;
1477 }
1478 }
1479
1480 req = qemu_get_virtqueue_element(vdev, f, sizeof(VirtIOBlockReq));
1481 virtio_blk_init_request(s, virtio_get_queue(vdev, vq_idx), req);
1482 req->next = s->rq;
1483 s->rq = req;
1484 }
1485
1486 return 0;
1487}
1488
1489static void virtio_resize_cb(void *opaque)
1490{
1491 VirtIODevice *vdev = opaque;
1492
1493 assert(qemu_get_current_aio_context() == qemu_get_aio_context());
1494 virtio_notify_config(vdev);
1495}
1496
1497static void virtio_blk_resize(void *opaque)
1498{
1499 VirtIODevice *vdev = VIRTIO_DEVICE(opaque);
1500
1501
1502
1503
1504
1505
1506 aio_bh_schedule_oneshot(qemu_get_aio_context(), virtio_resize_cb, vdev);
1507}
1508
1509
1510static void virtio_blk_drained_begin(void *opaque)
1511{
1512 VirtIOBlock *s = opaque;
1513 VirtIODevice *vdev = VIRTIO_DEVICE(opaque);
1514 AioContext *ctx = blk_get_aio_context(s->conf.conf.blk);
1515
1516 if (!s->dataplane || !s->dataplane_started) {
1517 return;
1518 }
1519
1520 for (uint16_t i = 0; i < s->conf.num_queues; i++) {
1521 VirtQueue *vq = virtio_get_queue(vdev, i);
1522 virtio_queue_aio_detach_host_notifier(vq, ctx);
1523 }
1524}
1525
1526
1527static void virtio_blk_drained_end(void *opaque)
1528{
1529 VirtIOBlock *s = opaque;
1530 VirtIODevice *vdev = VIRTIO_DEVICE(opaque);
1531 AioContext *ctx = blk_get_aio_context(s->conf.conf.blk);
1532
1533 if (!s->dataplane || !s->dataplane_started) {
1534 return;
1535 }
1536
1537 for (uint16_t i = 0; i < s->conf.num_queues; i++) {
1538 VirtQueue *vq = virtio_get_queue(vdev, i);
1539 virtio_queue_aio_attach_host_notifier(vq, ctx);
1540 }
1541}
1542
1543static const BlockDevOps virtio_block_ops = {
1544 .resize_cb = virtio_blk_resize,
1545 .drained_begin = virtio_blk_drained_begin,
1546 .drained_end = virtio_blk_drained_end,
1547};
1548
1549static void virtio_blk_device_realize(DeviceState *dev, Error **errp)
1550{
1551 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
1552 VirtIOBlock *s = VIRTIO_BLK(dev);
1553 VirtIOBlkConf *conf = &s->conf;
1554 Error *err = NULL;
1555 unsigned i;
1556
1557 if (!conf->conf.blk) {
1558 error_setg(errp, "drive property not set");
1559 return;
1560 }
1561 if (!blk_is_inserted(conf->conf.blk)) {
1562 error_setg(errp, "Device needs media, but drive is empty");
1563 return;
1564 }
1565 if (conf->num_queues == VIRTIO_BLK_AUTO_NUM_QUEUES) {
1566 conf->num_queues = 1;
1567 }
1568 if (!conf->num_queues) {
1569 error_setg(errp, "num-queues property must be larger than 0");
1570 return;
1571 }
1572 if (conf->queue_size <= 2) {
1573 error_setg(errp, "invalid queue-size property (%" PRIu16 "), "
1574 "must be > 2", conf->queue_size);
1575 return;
1576 }
1577 if (!is_power_of_2(conf->queue_size) ||
1578 conf->queue_size > VIRTQUEUE_MAX_SIZE) {
1579 error_setg(errp, "invalid queue-size property (%" PRIu16 "), "
1580 "must be a power of 2 (max %d)",
1581 conf->queue_size, VIRTQUEUE_MAX_SIZE);
1582 return;
1583 }
1584
1585 if (!blkconf_apply_backend_options(&conf->conf,
1586 !blk_supports_write_perm(conf->conf.blk),
1587 true, errp)) {
1588 return;
1589 }
1590 s->original_wce = blk_enable_write_cache(conf->conf.blk);
1591 if (!blkconf_geometry(&conf->conf, NULL, 65535, 255, 255, errp)) {
1592 return;
1593 }
1594
1595 if (!blkconf_blocksizes(&conf->conf, errp)) {
1596 return;
1597 }
1598
1599 BlockDriverState *bs = blk_bs(conf->conf.blk);
1600 if (bs->bl.zoned != BLK_Z_NONE) {
1601 virtio_add_feature(&s->host_features, VIRTIO_BLK_F_ZONED);
1602 if (bs->bl.zoned == BLK_Z_HM) {
1603 virtio_clear_feature(&s->host_features, VIRTIO_BLK_F_DISCARD);
1604 }
1605 }
1606
1607 if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_DISCARD) &&
1608 (!conf->max_discard_sectors ||
1609 conf->max_discard_sectors > BDRV_REQUEST_MAX_SECTORS)) {
1610 error_setg(errp, "invalid max-discard-sectors property (%" PRIu32 ")"
1611 ", must be between 1 and %d",
1612 conf->max_discard_sectors, (int)BDRV_REQUEST_MAX_SECTORS);
1613 return;
1614 }
1615
1616 if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_WRITE_ZEROES) &&
1617 (!conf->max_write_zeroes_sectors ||
1618 conf->max_write_zeroes_sectors > BDRV_REQUEST_MAX_SECTORS)) {
1619 error_setg(errp, "invalid max-write-zeroes-sectors property (%" PRIu32
1620 "), must be between 1 and %d",
1621 conf->max_write_zeroes_sectors,
1622 (int)BDRV_REQUEST_MAX_SECTORS);
1623 return;
1624 }
1625
1626 s->config_size = virtio_get_config_size(&virtio_blk_cfg_size_params,
1627 s->host_features);
1628 virtio_init(vdev, VIRTIO_ID_BLOCK, s->config_size);
1629
1630 s->blk = conf->conf.blk;
1631 s->rq = NULL;
1632 s->sector_mask = (s->conf.conf.logical_block_size / BDRV_SECTOR_SIZE) - 1;
1633
1634 for (i = 0; i < conf->num_queues; i++) {
1635 virtio_add_queue(vdev, conf->queue_size, virtio_blk_handle_output);
1636 }
1637 qemu_coroutine_inc_pool_size(conf->num_queues * conf->queue_size / 2);
1638 virtio_blk_data_plane_create(vdev, conf, &s->dataplane, &err);
1639 if (err != NULL) {
1640 error_propagate(errp, err);
1641 for (i = 0; i < conf->num_queues; i++) {
1642 virtio_del_queue(vdev, i);
1643 }
1644 virtio_cleanup(vdev);
1645 return;
1646 }
1647
1648
1649
1650
1651
1652 s->change =
1653 qdev_add_vm_change_state_handler(dev, virtio_blk_dma_restart_cb, s);
1654
1655 blk_ram_registrar_init(&s->blk_ram_registrar, s->blk);
1656 blk_set_dev_ops(s->blk, &virtio_block_ops, s);
1657
1658 blk_iostatus_enable(s->blk);
1659
1660 add_boot_device_lchs(dev, "/disk@0,0",
1661 conf->conf.lcyls,
1662 conf->conf.lheads,
1663 conf->conf.lsecs);
1664}
1665
1666static void virtio_blk_device_unrealize(DeviceState *dev)
1667{
1668 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
1669 VirtIOBlock *s = VIRTIO_BLK(dev);
1670 VirtIOBlkConf *conf = &s->conf;
1671 unsigned i;
1672
1673 blk_drain(s->blk);
1674 del_boot_device_lchs(dev, "/disk@0,0");
1675 virtio_blk_data_plane_destroy(s->dataplane);
1676 s->dataplane = NULL;
1677 for (i = 0; i < conf->num_queues; i++) {
1678 virtio_del_queue(vdev, i);
1679 }
1680 qemu_coroutine_dec_pool_size(conf->num_queues * conf->queue_size / 2);
1681 blk_ram_registrar_destroy(&s->blk_ram_registrar);
1682 qemu_del_vm_change_state_handler(s->change);
1683 blockdev_mark_auto_del(s->blk);
1684 virtio_cleanup(vdev);
1685}
1686
1687static void virtio_blk_instance_init(Object *obj)
1688{
1689 VirtIOBlock *s = VIRTIO_BLK(obj);
1690
1691 device_add_bootindex_property(obj, &s->conf.conf.bootindex,
1692 "bootindex", "/disk@0,0",
1693 DEVICE(obj));
1694}
1695
1696static const VMStateDescription vmstate_virtio_blk = {
1697 .name = "virtio-blk",
1698 .minimum_version_id = 2,
1699 .version_id = 2,
1700 .fields = (VMStateField[]) {
1701 VMSTATE_VIRTIO_DEVICE,
1702 VMSTATE_END_OF_LIST()
1703 },
1704};
1705
1706static Property virtio_blk_properties[] = {
1707 DEFINE_BLOCK_PROPERTIES(VirtIOBlock, conf.conf),
1708 DEFINE_BLOCK_ERROR_PROPERTIES(VirtIOBlock, conf.conf),
1709 DEFINE_BLOCK_CHS_PROPERTIES(VirtIOBlock, conf.conf),
1710 DEFINE_PROP_STRING("serial", VirtIOBlock, conf.serial),
1711 DEFINE_PROP_BIT64("config-wce", VirtIOBlock, host_features,
1712 VIRTIO_BLK_F_CONFIG_WCE, true),
1713#ifdef __linux__
1714 DEFINE_PROP_BIT64("scsi", VirtIOBlock, host_features,
1715 VIRTIO_BLK_F_SCSI, false),
1716#endif
1717 DEFINE_PROP_BIT("request-merging", VirtIOBlock, conf.request_merging, 0,
1718 true),
1719 DEFINE_PROP_UINT16("num-queues", VirtIOBlock, conf.num_queues,
1720 VIRTIO_BLK_AUTO_NUM_QUEUES),
1721 DEFINE_PROP_UINT16("queue-size", VirtIOBlock, conf.queue_size, 256),
1722 DEFINE_PROP_BOOL("seg-max-adjust", VirtIOBlock, conf.seg_max_adjust, true),
1723 DEFINE_PROP_LINK("iothread", VirtIOBlock, conf.iothread, TYPE_IOTHREAD,
1724 IOThread *),
1725 DEFINE_PROP_BIT64("discard", VirtIOBlock, host_features,
1726 VIRTIO_BLK_F_DISCARD, true),
1727 DEFINE_PROP_BOOL("report-discard-granularity", VirtIOBlock,
1728 conf.report_discard_granularity, true),
1729 DEFINE_PROP_BIT64("write-zeroes", VirtIOBlock, host_features,
1730 VIRTIO_BLK_F_WRITE_ZEROES, true),
1731 DEFINE_PROP_UINT32("max-discard-sectors", VirtIOBlock,
1732 conf.max_discard_sectors, BDRV_REQUEST_MAX_SECTORS),
1733 DEFINE_PROP_UINT32("max-write-zeroes-sectors", VirtIOBlock,
1734 conf.max_write_zeroes_sectors, BDRV_REQUEST_MAX_SECTORS),
1735 DEFINE_PROP_BOOL("x-enable-wce-if-config-wce", VirtIOBlock,
1736 conf.x_enable_wce_if_config_wce, true),
1737 DEFINE_PROP_END_OF_LIST(),
1738};
1739
1740static void virtio_blk_class_init(ObjectClass *klass, void *data)
1741{
1742 DeviceClass *dc = DEVICE_CLASS(klass);
1743 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
1744
1745 device_class_set_props(dc, virtio_blk_properties);
1746 dc->vmsd = &vmstate_virtio_blk;
1747 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
1748 vdc->realize = virtio_blk_device_realize;
1749 vdc->unrealize = virtio_blk_device_unrealize;
1750 vdc->get_config = virtio_blk_update_config;
1751 vdc->set_config = virtio_blk_set_config;
1752 vdc->get_features = virtio_blk_get_features;
1753 vdc->set_status = virtio_blk_set_status;
1754 vdc->reset = virtio_blk_reset;
1755 vdc->save = virtio_blk_save_device;
1756 vdc->load = virtio_blk_load_device;
1757 vdc->start_ioeventfd = virtio_blk_data_plane_start;
1758 vdc->stop_ioeventfd = virtio_blk_data_plane_stop;
1759}
1760
1761static const TypeInfo virtio_blk_info = {
1762 .name = TYPE_VIRTIO_BLK,
1763 .parent = TYPE_VIRTIO_DEVICE,
1764 .instance_size = sizeof(VirtIOBlock),
1765 .instance_init = virtio_blk_instance_init,
1766 .class_init = virtio_blk_class_init,
1767};
1768
1769static void virtio_register_types(void)
1770{
1771 type_register_static(&virtio_blk_info);
1772}
1773
1774type_init(virtio_register_types)
1775