Update VERSION for v7.2.0-rc4
[qemu.git] / hw / block / virtio-blk.c
1 /*
2 * Virtio Block Device
3 *
4 * Copyright IBM, Corp. 2007
5 *
6 * Authors:
7 * Anthony Liguori <aliguori@us.ibm.com>
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
11 *
12 */
13
14 #include "qemu/osdep.h"
15 #include "qapi/error.h"
16 #include "qemu/iov.h"
17 #include "qemu/module.h"
18 #include "qemu/error-report.h"
19 #include "qemu/main-loop.h"
20 #include "trace.h"
21 #include "hw/block/block.h"
22 #include "hw/qdev-properties.h"
23 #include "sysemu/blockdev.h"
24 #include "sysemu/sysemu.h"
25 #include "sysemu/runstate.h"
26 #include "hw/virtio/virtio-blk.h"
27 #include "dataplane/virtio-blk.h"
28 #include "scsi/constants.h"
29 #ifdef __linux__
30 # include <scsi/sg.h>
31 #endif
32 #include "hw/virtio/virtio-bus.h"
33 #include "migration/qemu-file-types.h"
34 #include "hw/virtio/virtio-access.h"
35 #include "qemu/coroutine.h"
36
37 /* Config size before the discard support (hide associated config fields) */
38 #define VIRTIO_BLK_CFG_SIZE offsetof(struct virtio_blk_config, \
39 max_discard_sectors)
40 /*
41 * Starting from the discard feature, we can use this array to properly
42 * set the config size depending on the features enabled.
43 */
44 static const VirtIOFeature feature_sizes[] = {
45 {.flags = 1ULL << VIRTIO_BLK_F_DISCARD,
46 .end = endof(struct virtio_blk_config, discard_sector_alignment)},
47 {.flags = 1ULL << VIRTIO_BLK_F_WRITE_ZEROES,
48 .end = endof(struct virtio_blk_config, write_zeroes_may_unmap)},
49 {}
50 };
51
52 static void virtio_blk_set_config_size(VirtIOBlock *s, uint64_t host_features)
53 {
54 s->config_size = MAX(VIRTIO_BLK_CFG_SIZE,
55 virtio_feature_get_config_size(feature_sizes, host_features));
56
57 assert(s->config_size <= sizeof(struct virtio_blk_config));
58 }
59
60 static void virtio_blk_init_request(VirtIOBlock *s, VirtQueue *vq,
61 VirtIOBlockReq *req)
62 {
63 req->dev = s;
64 req->vq = vq;
65 req->qiov.size = 0;
66 req->in_len = 0;
67 req->next = NULL;
68 req->mr_next = NULL;
69 }
70
71 static void virtio_blk_free_request(VirtIOBlockReq *req)
72 {
73 g_free(req);
74 }
75
76 static void virtio_blk_req_complete(VirtIOBlockReq *req, unsigned char status)
77 {
78 VirtIOBlock *s = req->dev;
79 VirtIODevice *vdev = VIRTIO_DEVICE(s);
80
81 trace_virtio_blk_req_complete(vdev, req, status);
82
83 stb_p(&req->in->status, status);
84 iov_discard_undo(&req->inhdr_undo);
85 iov_discard_undo(&req->outhdr_undo);
86 virtqueue_push(req->vq, &req->elem, req->in_len);
87 if (s->dataplane_started && !s->dataplane_disabled) {
88 virtio_blk_data_plane_notify(s->dataplane, req->vq);
89 } else {
90 virtio_notify(vdev, req->vq);
91 }
92 }
93
94 static int virtio_blk_handle_rw_error(VirtIOBlockReq *req, int error,
95 bool is_read, bool acct_failed)
96 {
97 VirtIOBlock *s = req->dev;
98 BlockErrorAction action = blk_get_error_action(s->blk, is_read, error);
99
100 if (action == BLOCK_ERROR_ACTION_STOP) {
101 /* Break the link as the next request is going to be parsed from the
102 * ring again. Otherwise we may end up doing a double completion! */
103 req->mr_next = NULL;
104 req->next = s->rq;
105 s->rq = req;
106 } else if (action == BLOCK_ERROR_ACTION_REPORT) {
107 virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR);
108 if (acct_failed) {
109 block_acct_failed(blk_get_stats(s->blk), &req->acct);
110 }
111 virtio_blk_free_request(req);
112 }
113
114 blk_error_action(s->blk, action, is_read, error);
115 return action != BLOCK_ERROR_ACTION_IGNORE;
116 }
117
118 static void virtio_blk_rw_complete(void *opaque, int ret)
119 {
120 VirtIOBlockReq *next = opaque;
121 VirtIOBlock *s = next->dev;
122 VirtIODevice *vdev = VIRTIO_DEVICE(s);
123
124 aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
125 while (next) {
126 VirtIOBlockReq *req = next;
127 next = req->mr_next;
128 trace_virtio_blk_rw_complete(vdev, req, ret);
129
130 if (req->qiov.nalloc != -1) {
131 /* If nalloc is != -1 req->qiov is a local copy of the original
132 * external iovec. It was allocated in submit_requests to be
133 * able to merge requests. */
134 qemu_iovec_destroy(&req->qiov);
135 }
136
137 if (ret) {
138 int p = virtio_ldl_p(VIRTIO_DEVICE(s), &req->out.type);
139 bool is_read = !(p & VIRTIO_BLK_T_OUT);
140 /* Note that memory may be dirtied on read failure. If the
141 * virtio request is not completed here, as is the case for
142 * BLOCK_ERROR_ACTION_STOP, the memory may not be copied
143 * correctly during live migration. While this is ugly,
144 * it is acceptable because the device is free to write to
145 * the memory until the request is completed (which will
146 * happen on the other side of the migration).
147 */
148 if (virtio_blk_handle_rw_error(req, -ret, is_read, true)) {
149 continue;
150 }
151 }
152
153 virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
154 block_acct_done(blk_get_stats(s->blk), &req->acct);
155 virtio_blk_free_request(req);
156 }
157 aio_context_release(blk_get_aio_context(s->conf.conf.blk));
158 }
159
160 static void virtio_blk_flush_complete(void *opaque, int ret)
161 {
162 VirtIOBlockReq *req = opaque;
163 VirtIOBlock *s = req->dev;
164
165 aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
166 if (ret) {
167 if (virtio_blk_handle_rw_error(req, -ret, 0, true)) {
168 goto out;
169 }
170 }
171
172 virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
173 block_acct_done(blk_get_stats(s->blk), &req->acct);
174 virtio_blk_free_request(req);
175
176 out:
177 aio_context_release(blk_get_aio_context(s->conf.conf.blk));
178 }
179
180 static void virtio_blk_discard_write_zeroes_complete(void *opaque, int ret)
181 {
182 VirtIOBlockReq *req = opaque;
183 VirtIOBlock *s = req->dev;
184 bool is_write_zeroes = (virtio_ldl_p(VIRTIO_DEVICE(s), &req->out.type) &
185 ~VIRTIO_BLK_T_BARRIER) == VIRTIO_BLK_T_WRITE_ZEROES;
186
187 aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
188 if (ret) {
189 if (virtio_blk_handle_rw_error(req, -ret, false, is_write_zeroes)) {
190 goto out;
191 }
192 }
193
194 virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
195 if (is_write_zeroes) {
196 block_acct_done(blk_get_stats(s->blk), &req->acct);
197 }
198 virtio_blk_free_request(req);
199
200 out:
201 aio_context_release(blk_get_aio_context(s->conf.conf.blk));
202 }
203
204 #ifdef __linux__
205
206 typedef struct {
207 VirtIOBlockReq *req;
208 struct sg_io_hdr hdr;
209 } VirtIOBlockIoctlReq;
210
211 static void virtio_blk_ioctl_complete(void *opaque, int status)
212 {
213 VirtIOBlockIoctlReq *ioctl_req = opaque;
214 VirtIOBlockReq *req = ioctl_req->req;
215 VirtIOBlock *s = req->dev;
216 VirtIODevice *vdev = VIRTIO_DEVICE(s);
217 struct virtio_scsi_inhdr *scsi;
218 struct sg_io_hdr *hdr;
219
220 scsi = (void *)req->elem.in_sg[req->elem.in_num - 2].iov_base;
221
222 if (status) {
223 status = VIRTIO_BLK_S_UNSUPP;
224 virtio_stl_p(vdev, &scsi->errors, 255);
225 goto out;
226 }
227
228 hdr = &ioctl_req->hdr;
229 /*
230 * From SCSI-Generic-HOWTO: "Some lower level drivers (e.g. ide-scsi)
231 * clear the masked_status field [hence status gets cleared too, see
232 * block/scsi_ioctl.c] even when a CHECK_CONDITION or COMMAND_TERMINATED
233 * status has occurred. However they do set DRIVER_SENSE in driver_status
234 * field. Also a (sb_len_wr > 0) indicates there is a sense buffer.
235 */
236 if (hdr->status == 0 && hdr->sb_len_wr > 0) {
237 hdr->status = CHECK_CONDITION;
238 }
239
240 virtio_stl_p(vdev, &scsi->errors,
241 hdr->status | (hdr->msg_status << 8) |
242 (hdr->host_status << 16) | (hdr->driver_status << 24));
243 virtio_stl_p(vdev, &scsi->residual, hdr->resid);
244 virtio_stl_p(vdev, &scsi->sense_len, hdr->sb_len_wr);
245 virtio_stl_p(vdev, &scsi->data_len, hdr->dxfer_len);
246
247 out:
248 aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
249 virtio_blk_req_complete(req, status);
250 virtio_blk_free_request(req);
251 aio_context_release(blk_get_aio_context(s->conf.conf.blk));
252 g_free(ioctl_req);
253 }
254
255 #endif
256
257 static VirtIOBlockReq *virtio_blk_get_request(VirtIOBlock *s, VirtQueue *vq)
258 {
259 VirtIOBlockReq *req = virtqueue_pop(vq, sizeof(VirtIOBlockReq));
260
261 if (req) {
262 virtio_blk_init_request(s, vq, req);
263 }
264 return req;
265 }
266
267 static int virtio_blk_handle_scsi_req(VirtIOBlockReq *req)
268 {
269 int status = VIRTIO_BLK_S_OK;
270 struct virtio_scsi_inhdr *scsi = NULL;
271 VirtIOBlock *blk = req->dev;
272 VirtIODevice *vdev = VIRTIO_DEVICE(blk);
273 VirtQueueElement *elem = &req->elem;
274
275 #ifdef __linux__
276 int i;
277 VirtIOBlockIoctlReq *ioctl_req;
278 BlockAIOCB *acb;
279 #endif
280
281 /*
282 * We require at least one output segment each for the virtio_blk_outhdr
283 * and the SCSI command block.
284 *
285 * We also at least require the virtio_blk_inhdr, the virtio_scsi_inhdr
286 * and the sense buffer pointer in the input segments.
287 */
288 if (elem->out_num < 2 || elem->in_num < 3) {
289 status = VIRTIO_BLK_S_IOERR;
290 goto fail;
291 }
292
293 /*
294 * The scsi inhdr is placed in the second-to-last input segment, just
295 * before the regular inhdr.
296 */
297 scsi = (void *)elem->in_sg[elem->in_num - 2].iov_base;
298
299 if (!virtio_has_feature(blk->host_features, VIRTIO_BLK_F_SCSI)) {
300 status = VIRTIO_BLK_S_UNSUPP;
301 goto fail;
302 }
303
304 /*
305 * No support for bidirection commands yet.
306 */
307 if (elem->out_num > 2 && elem->in_num > 3) {
308 status = VIRTIO_BLK_S_UNSUPP;
309 goto fail;
310 }
311
312 #ifdef __linux__
313 ioctl_req = g_new0(VirtIOBlockIoctlReq, 1);
314 ioctl_req->req = req;
315 ioctl_req->hdr.interface_id = 'S';
316 ioctl_req->hdr.cmd_len = elem->out_sg[1].iov_len;
317 ioctl_req->hdr.cmdp = elem->out_sg[1].iov_base;
318 ioctl_req->hdr.dxfer_len = 0;
319
320 if (elem->out_num > 2) {
321 /*
322 * If there are more than the minimally required 2 output segments
323 * there is write payload starting from the third iovec.
324 */
325 ioctl_req->hdr.dxfer_direction = SG_DXFER_TO_DEV;
326 ioctl_req->hdr.iovec_count = elem->out_num - 2;
327
328 for (i = 0; i < ioctl_req->hdr.iovec_count; i++) {
329 ioctl_req->hdr.dxfer_len += elem->out_sg[i + 2].iov_len;
330 }
331
332 ioctl_req->hdr.dxferp = elem->out_sg + 2;
333
334 } else if (elem->in_num > 3) {
335 /*
336 * If we have more than 3 input segments the guest wants to actually
337 * read data.
338 */
339 ioctl_req->hdr.dxfer_direction = SG_DXFER_FROM_DEV;
340 ioctl_req->hdr.iovec_count = elem->in_num - 3;
341 for (i = 0; i < ioctl_req->hdr.iovec_count; i++) {
342 ioctl_req->hdr.dxfer_len += elem->in_sg[i].iov_len;
343 }
344
345 ioctl_req->hdr.dxferp = elem->in_sg;
346 } else {
347 /*
348 * Some SCSI commands don't actually transfer any data.
349 */
350 ioctl_req->hdr.dxfer_direction = SG_DXFER_NONE;
351 }
352
353 ioctl_req->hdr.sbp = elem->in_sg[elem->in_num - 3].iov_base;
354 ioctl_req->hdr.mx_sb_len = elem->in_sg[elem->in_num - 3].iov_len;
355
356 acb = blk_aio_ioctl(blk->blk, SG_IO, &ioctl_req->hdr,
357 virtio_blk_ioctl_complete, ioctl_req);
358 if (!acb) {
359 g_free(ioctl_req);
360 status = VIRTIO_BLK_S_UNSUPP;
361 goto fail;
362 }
363 return -EINPROGRESS;
364 #else
365 abort();
366 #endif
367
368 fail:
369 /* Just put anything nonzero so that the ioctl fails in the guest. */
370 if (scsi) {
371 virtio_stl_p(vdev, &scsi->errors, 255);
372 }
373 return status;
374 }
375
376 static void virtio_blk_handle_scsi(VirtIOBlockReq *req)
377 {
378 int status;
379
380 status = virtio_blk_handle_scsi_req(req);
381 if (status != -EINPROGRESS) {
382 virtio_blk_req_complete(req, status);
383 virtio_blk_free_request(req);
384 }
385 }
386
387 static inline void submit_requests(BlockBackend *blk, MultiReqBuffer *mrb,
388 int start, int num_reqs, int niov)
389 {
390 QEMUIOVector *qiov = &mrb->reqs[start]->qiov;
391 int64_t sector_num = mrb->reqs[start]->sector_num;
392 bool is_write = mrb->is_write;
393
394 if (num_reqs > 1) {
395 int i;
396 struct iovec *tmp_iov = qiov->iov;
397 int tmp_niov = qiov->niov;
398
399 /* mrb->reqs[start]->qiov was initialized from external so we can't
400 * modify it here. We need to initialize it locally and then add the
401 * external iovecs. */
402 qemu_iovec_init(qiov, niov);
403
404 for (i = 0; i < tmp_niov; i++) {
405 qemu_iovec_add(qiov, tmp_iov[i].iov_base, tmp_iov[i].iov_len);
406 }
407
408 for (i = start + 1; i < start + num_reqs; i++) {
409 qemu_iovec_concat(qiov, &mrb->reqs[i]->qiov, 0,
410 mrb->reqs[i]->qiov.size);
411 mrb->reqs[i - 1]->mr_next = mrb->reqs[i];
412 }
413
414 trace_virtio_blk_submit_multireq(VIRTIO_DEVICE(mrb->reqs[start]->dev),
415 mrb, start, num_reqs,
416 sector_num << BDRV_SECTOR_BITS,
417 qiov->size, is_write);
418 block_acct_merge_done(blk_get_stats(blk),
419 is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ,
420 num_reqs - 1);
421 }
422
423 if (is_write) {
424 blk_aio_pwritev(blk, sector_num << BDRV_SECTOR_BITS, qiov, 0,
425 virtio_blk_rw_complete, mrb->reqs[start]);
426 } else {
427 blk_aio_preadv(blk, sector_num << BDRV_SECTOR_BITS, qiov, 0,
428 virtio_blk_rw_complete, mrb->reqs[start]);
429 }
430 }
431
432 static int multireq_compare(const void *a, const void *b)
433 {
434 const VirtIOBlockReq *req1 = *(VirtIOBlockReq **)a,
435 *req2 = *(VirtIOBlockReq **)b;
436
437 /*
438 * Note that we can't simply subtract sector_num1 from sector_num2
439 * here as that could overflow the return value.
440 */
441 if (req1->sector_num > req2->sector_num) {
442 return 1;
443 } else if (req1->sector_num < req2->sector_num) {
444 return -1;
445 } else {
446 return 0;
447 }
448 }
449
450 static void virtio_blk_submit_multireq(BlockBackend *blk, MultiReqBuffer *mrb)
451 {
452 int i = 0, start = 0, num_reqs = 0, niov = 0, nb_sectors = 0;
453 uint32_t max_transfer;
454 int64_t sector_num = 0;
455
456 if (mrb->num_reqs == 1) {
457 submit_requests(blk, mrb, 0, 1, -1);
458 mrb->num_reqs = 0;
459 return;
460 }
461
462 max_transfer = blk_get_max_transfer(mrb->reqs[0]->dev->blk);
463
464 qsort(mrb->reqs, mrb->num_reqs, sizeof(*mrb->reqs),
465 &multireq_compare);
466
467 for (i = 0; i < mrb->num_reqs; i++) {
468 VirtIOBlockReq *req = mrb->reqs[i];
469 if (num_reqs > 0) {
470 /*
471 * NOTE: We cannot merge the requests in below situations:
472 * 1. requests are not sequential
473 * 2. merge would exceed maximum number of IOVs
474 * 3. merge would exceed maximum transfer length of backend device
475 */
476 if (sector_num + nb_sectors != req->sector_num ||
477 niov > blk_get_max_iov(blk) - req->qiov.niov ||
478 req->qiov.size > max_transfer ||
479 nb_sectors > (max_transfer -
480 req->qiov.size) / BDRV_SECTOR_SIZE) {
481 submit_requests(blk, mrb, start, num_reqs, niov);
482 num_reqs = 0;
483 }
484 }
485
486 if (num_reqs == 0) {
487 sector_num = req->sector_num;
488 nb_sectors = niov = 0;
489 start = i;
490 }
491
492 nb_sectors += req->qiov.size / BDRV_SECTOR_SIZE;
493 niov += req->qiov.niov;
494 num_reqs++;
495 }
496
497 submit_requests(blk, mrb, start, num_reqs, niov);
498 mrb->num_reqs = 0;
499 }
500
501 static void virtio_blk_handle_flush(VirtIOBlockReq *req, MultiReqBuffer *mrb)
502 {
503 VirtIOBlock *s = req->dev;
504
505 block_acct_start(blk_get_stats(s->blk), &req->acct, 0,
506 BLOCK_ACCT_FLUSH);
507
508 /*
509 * Make sure all outstanding writes are posted to the backing device.
510 */
511 if (mrb->is_write && mrb->num_reqs > 0) {
512 virtio_blk_submit_multireq(s->blk, mrb);
513 }
514 blk_aio_flush(s->blk, virtio_blk_flush_complete, req);
515 }
516
517 static bool virtio_blk_sect_range_ok(VirtIOBlock *dev,
518 uint64_t sector, size_t size)
519 {
520 uint64_t nb_sectors = size >> BDRV_SECTOR_BITS;
521 uint64_t total_sectors;
522
523 if (nb_sectors > BDRV_REQUEST_MAX_SECTORS) {
524 return false;
525 }
526 if (sector & dev->sector_mask) {
527 return false;
528 }
529 if (size % dev->conf.conf.logical_block_size) {
530 return false;
531 }
532 blk_get_geometry(dev->blk, &total_sectors);
533 if (sector > total_sectors || nb_sectors > total_sectors - sector) {
534 return false;
535 }
536 return true;
537 }
538
539 static uint8_t virtio_blk_handle_discard_write_zeroes(VirtIOBlockReq *req,
540 struct virtio_blk_discard_write_zeroes *dwz_hdr, bool is_write_zeroes)
541 {
542 VirtIOBlock *s = req->dev;
543 VirtIODevice *vdev = VIRTIO_DEVICE(s);
544 uint64_t sector;
545 uint32_t num_sectors, flags, max_sectors;
546 uint8_t err_status;
547 int bytes;
548
549 sector = virtio_ldq_p(vdev, &dwz_hdr->sector);
550 num_sectors = virtio_ldl_p(vdev, &dwz_hdr->num_sectors);
551 flags = virtio_ldl_p(vdev, &dwz_hdr->flags);
552 max_sectors = is_write_zeroes ? s->conf.max_write_zeroes_sectors :
553 s->conf.max_discard_sectors;
554
555 /*
556 * max_sectors is at most BDRV_REQUEST_MAX_SECTORS, this check
557 * make us sure that "num_sectors << BDRV_SECTOR_BITS" can fit in
558 * the integer variable.
559 */
560 if (unlikely(num_sectors > max_sectors)) {
561 err_status = VIRTIO_BLK_S_IOERR;
562 goto err;
563 }
564
565 bytes = num_sectors << BDRV_SECTOR_BITS;
566
567 if (unlikely(!virtio_blk_sect_range_ok(s, sector, bytes))) {
568 err_status = VIRTIO_BLK_S_IOERR;
569 goto err;
570 }
571
572 /*
573 * The device MUST set the status byte to VIRTIO_BLK_S_UNSUPP for discard
574 * and write zeroes commands if any unknown flag is set.
575 */
576 if (unlikely(flags & ~VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP)) {
577 err_status = VIRTIO_BLK_S_UNSUPP;
578 goto err;
579 }
580
581 if (is_write_zeroes) { /* VIRTIO_BLK_T_WRITE_ZEROES */
582 int blk_aio_flags = 0;
583
584 if (flags & VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP) {
585 blk_aio_flags |= BDRV_REQ_MAY_UNMAP;
586 }
587
588 block_acct_start(blk_get_stats(s->blk), &req->acct, bytes,
589 BLOCK_ACCT_WRITE);
590
591 blk_aio_pwrite_zeroes(s->blk, sector << BDRV_SECTOR_BITS,
592 bytes, blk_aio_flags,
593 virtio_blk_discard_write_zeroes_complete, req);
594 } else { /* VIRTIO_BLK_T_DISCARD */
595 /*
596 * The device MUST set the status byte to VIRTIO_BLK_S_UNSUPP for
597 * discard commands if the unmap flag is set.
598 */
599 if (unlikely(flags & VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP)) {
600 err_status = VIRTIO_BLK_S_UNSUPP;
601 goto err;
602 }
603
604 blk_aio_pdiscard(s->blk, sector << BDRV_SECTOR_BITS, bytes,
605 virtio_blk_discard_write_zeroes_complete, req);
606 }
607
608 return VIRTIO_BLK_S_OK;
609
610 err:
611 if (is_write_zeroes) {
612 block_acct_invalid(blk_get_stats(s->blk), BLOCK_ACCT_WRITE);
613 }
614 return err_status;
615 }
616
617 static int virtio_blk_handle_request(VirtIOBlockReq *req, MultiReqBuffer *mrb)
618 {
619 uint32_t type;
620 struct iovec *in_iov = req->elem.in_sg;
621 struct iovec *out_iov = req->elem.out_sg;
622 unsigned in_num = req->elem.in_num;
623 unsigned out_num = req->elem.out_num;
624 VirtIOBlock *s = req->dev;
625 VirtIODevice *vdev = VIRTIO_DEVICE(s);
626
627 if (req->elem.out_num < 1 || req->elem.in_num < 1) {
628 virtio_error(vdev, "virtio-blk missing headers");
629 return -1;
630 }
631
632 if (unlikely(iov_to_buf(out_iov, out_num, 0, &req->out,
633 sizeof(req->out)) != sizeof(req->out))) {
634 virtio_error(vdev, "virtio-blk request outhdr too short");
635 return -1;
636 }
637
638 iov_discard_front_undoable(&out_iov, &out_num, sizeof(req->out),
639 &req->outhdr_undo);
640
641 if (in_iov[in_num - 1].iov_len < sizeof(struct virtio_blk_inhdr)) {
642 virtio_error(vdev, "virtio-blk request inhdr too short");
643 iov_discard_undo(&req->outhdr_undo);
644 return -1;
645 }
646
647 /* We always touch the last byte, so just see how big in_iov is. */
648 req->in_len = iov_size(in_iov, in_num);
649 req->in = (void *)in_iov[in_num - 1].iov_base
650 + in_iov[in_num - 1].iov_len
651 - sizeof(struct virtio_blk_inhdr);
652 iov_discard_back_undoable(in_iov, &in_num, sizeof(struct virtio_blk_inhdr),
653 &req->inhdr_undo);
654
655 type = virtio_ldl_p(vdev, &req->out.type);
656
657 /* VIRTIO_BLK_T_OUT defines the command direction. VIRTIO_BLK_T_BARRIER
658 * is an optional flag. Although a guest should not send this flag if
659 * not negotiated we ignored it in the past. So keep ignoring it. */
660 switch (type & ~(VIRTIO_BLK_T_OUT | VIRTIO_BLK_T_BARRIER)) {
661 case VIRTIO_BLK_T_IN:
662 {
663 bool is_write = type & VIRTIO_BLK_T_OUT;
664 req->sector_num = virtio_ldq_p(vdev, &req->out.sector);
665
666 if (is_write) {
667 qemu_iovec_init_external(&req->qiov, out_iov, out_num);
668 trace_virtio_blk_handle_write(vdev, req, req->sector_num,
669 req->qiov.size / BDRV_SECTOR_SIZE);
670 } else {
671 qemu_iovec_init_external(&req->qiov, in_iov, in_num);
672 trace_virtio_blk_handle_read(vdev, req, req->sector_num,
673 req->qiov.size / BDRV_SECTOR_SIZE);
674 }
675
676 if (!virtio_blk_sect_range_ok(s, req->sector_num, req->qiov.size)) {
677 virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR);
678 block_acct_invalid(blk_get_stats(s->blk),
679 is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ);
680 virtio_blk_free_request(req);
681 return 0;
682 }
683
684 block_acct_start(blk_get_stats(s->blk), &req->acct, req->qiov.size,
685 is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ);
686
687 /* merge would exceed maximum number of requests or IO direction
688 * changes */
689 if (mrb->num_reqs > 0 && (mrb->num_reqs == VIRTIO_BLK_MAX_MERGE_REQS ||
690 is_write != mrb->is_write ||
691 !s->conf.request_merging)) {
692 virtio_blk_submit_multireq(s->blk, mrb);
693 }
694
695 assert(mrb->num_reqs < VIRTIO_BLK_MAX_MERGE_REQS);
696 mrb->reqs[mrb->num_reqs++] = req;
697 mrb->is_write = is_write;
698 break;
699 }
700 case VIRTIO_BLK_T_FLUSH:
701 virtio_blk_handle_flush(req, mrb);
702 break;
703 case VIRTIO_BLK_T_SCSI_CMD:
704 virtio_blk_handle_scsi(req);
705 break;
706 case VIRTIO_BLK_T_GET_ID:
707 {
708 /*
709 * NB: per existing s/n string convention the string is
710 * terminated by '\0' only when shorter than buffer.
711 */
712 const char *serial = s->conf.serial ? s->conf.serial : "";
713 size_t size = MIN(strlen(serial) + 1,
714 MIN(iov_size(in_iov, in_num),
715 VIRTIO_BLK_ID_BYTES));
716 iov_from_buf(in_iov, in_num, 0, serial, size);
717 virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
718 virtio_blk_free_request(req);
719 break;
720 }
721 /*
722 * VIRTIO_BLK_T_DISCARD and VIRTIO_BLK_T_WRITE_ZEROES are defined with
723 * VIRTIO_BLK_T_OUT flag set. We masked this flag in the switch statement,
724 * so we must mask it for these requests, then we will check if it is set.
725 */
726 case VIRTIO_BLK_T_DISCARD & ~VIRTIO_BLK_T_OUT:
727 case VIRTIO_BLK_T_WRITE_ZEROES & ~VIRTIO_BLK_T_OUT:
728 {
729 struct virtio_blk_discard_write_zeroes dwz_hdr;
730 size_t out_len = iov_size(out_iov, out_num);
731 bool is_write_zeroes = (type & ~VIRTIO_BLK_T_BARRIER) ==
732 VIRTIO_BLK_T_WRITE_ZEROES;
733 uint8_t err_status;
734
735 /*
736 * Unsupported if VIRTIO_BLK_T_OUT is not set or the request contains
737 * more than one segment.
738 */
739 if (unlikely(!(type & VIRTIO_BLK_T_OUT) ||
740 out_len > sizeof(dwz_hdr))) {
741 virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP);
742 virtio_blk_free_request(req);
743 return 0;
744 }
745
746 if (unlikely(iov_to_buf(out_iov, out_num, 0, &dwz_hdr,
747 sizeof(dwz_hdr)) != sizeof(dwz_hdr))) {
748 iov_discard_undo(&req->inhdr_undo);
749 iov_discard_undo(&req->outhdr_undo);
750 virtio_error(vdev, "virtio-blk discard/write_zeroes header"
751 " too short");
752 return -1;
753 }
754
755 err_status = virtio_blk_handle_discard_write_zeroes(req, &dwz_hdr,
756 is_write_zeroes);
757 if (err_status != VIRTIO_BLK_S_OK) {
758 virtio_blk_req_complete(req, err_status);
759 virtio_blk_free_request(req);
760 }
761
762 break;
763 }
764 default:
765 virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP);
766 virtio_blk_free_request(req);
767 }
768 return 0;
769 }
770
771 void virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq)
772 {
773 VirtIOBlockReq *req;
774 MultiReqBuffer mrb = {};
775 bool suppress_notifications = virtio_queue_get_notification(vq);
776
777 aio_context_acquire(blk_get_aio_context(s->blk));
778 blk_io_plug(s->blk);
779
780 do {
781 if (suppress_notifications) {
782 virtio_queue_set_notification(vq, 0);
783 }
784
785 while ((req = virtio_blk_get_request(s, vq))) {
786 if (virtio_blk_handle_request(req, &mrb)) {
787 virtqueue_detach_element(req->vq, &req->elem, 0);
788 virtio_blk_free_request(req);
789 break;
790 }
791 }
792
793 if (suppress_notifications) {
794 virtio_queue_set_notification(vq, 1);
795 }
796 } while (!virtio_queue_empty(vq));
797
798 if (mrb.num_reqs) {
799 virtio_blk_submit_multireq(s->blk, &mrb);
800 }
801
802 blk_io_unplug(s->blk);
803 aio_context_release(blk_get_aio_context(s->blk));
804 }
805
806 static void virtio_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq)
807 {
808 VirtIOBlock *s = (VirtIOBlock *)vdev;
809
810 if (s->dataplane && !s->dataplane_started) {
811 /* Some guests kick before setting VIRTIO_CONFIG_S_DRIVER_OK so start
812 * dataplane here instead of waiting for .set_status().
813 */
814 virtio_device_start_ioeventfd(vdev);
815 if (!s->dataplane_disabled) {
816 return;
817 }
818 }
819 virtio_blk_handle_vq(s, vq);
820 }
821
822 void virtio_blk_process_queued_requests(VirtIOBlock *s, bool is_bh)
823 {
824 VirtIOBlockReq *req = s->rq;
825 MultiReqBuffer mrb = {};
826
827 s->rq = NULL;
828
829 aio_context_acquire(blk_get_aio_context(s->conf.conf.blk));
830 while (req) {
831 VirtIOBlockReq *next = req->next;
832 if (virtio_blk_handle_request(req, &mrb)) {
833 /* Device is now broken and won't do any processing until it gets
834 * reset. Already queued requests will be lost: let's purge them.
835 */
836 while (req) {
837 next = req->next;
838 virtqueue_detach_element(req->vq, &req->elem, 0);
839 virtio_blk_free_request(req);
840 req = next;
841 }
842 break;
843 }
844 req = next;
845 }
846
847 if (mrb.num_reqs) {
848 virtio_blk_submit_multireq(s->blk, &mrb);
849 }
850 if (is_bh) {
851 blk_dec_in_flight(s->conf.conf.blk);
852 }
853 aio_context_release(blk_get_aio_context(s->conf.conf.blk));
854 }
855
856 static void virtio_blk_dma_restart_bh(void *opaque)
857 {
858 VirtIOBlock *s = opaque;
859
860 qemu_bh_delete(s->bh);
861 s->bh = NULL;
862
863 virtio_blk_process_queued_requests(s, true);
864 }
865
866 static void virtio_blk_dma_restart_cb(void *opaque, bool running,
867 RunState state)
868 {
869 VirtIOBlock *s = opaque;
870 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(s)));
871 VirtioBusState *bus = VIRTIO_BUS(qbus);
872
873 if (!running) {
874 return;
875 }
876
877 /*
878 * If ioeventfd is enabled, don't schedule the BH here as queued
879 * requests will be processed while starting the data plane.
880 */
881 if (!s->bh && !virtio_bus_ioeventfd_enabled(bus)) {
882 s->bh = aio_bh_new(blk_get_aio_context(s->conf.conf.blk),
883 virtio_blk_dma_restart_bh, s);
884 blk_inc_in_flight(s->conf.conf.blk);
885 qemu_bh_schedule(s->bh);
886 }
887 }
888
889 static void virtio_blk_reset(VirtIODevice *vdev)
890 {
891 VirtIOBlock *s = VIRTIO_BLK(vdev);
892 AioContext *ctx;
893 VirtIOBlockReq *req;
894
895 ctx = blk_get_aio_context(s->blk);
896 aio_context_acquire(ctx);
897 blk_drain(s->blk);
898
899 /* We drop queued requests after blk_drain() because blk_drain() itself can
900 * produce them. */
901 while (s->rq) {
902 req = s->rq;
903 s->rq = req->next;
904 virtqueue_detach_element(req->vq, &req->elem, 0);
905 virtio_blk_free_request(req);
906 }
907
908 aio_context_release(ctx);
909
910 assert(!s->dataplane_started);
911 blk_set_enable_write_cache(s->blk, s->original_wce);
912 }
913
914 /* coalesce internal state, copy to pci i/o region 0
915 */
916 static void virtio_blk_update_config(VirtIODevice *vdev, uint8_t *config)
917 {
918 VirtIOBlock *s = VIRTIO_BLK(vdev);
919 BlockConf *conf = &s->conf.conf;
920 struct virtio_blk_config blkcfg;
921 uint64_t capacity;
922 int64_t length;
923 int blk_size = conf->logical_block_size;
924
925 blk_get_geometry(s->blk, &capacity);
926 memset(&blkcfg, 0, sizeof(blkcfg));
927 virtio_stq_p(vdev, &blkcfg.capacity, capacity);
928 virtio_stl_p(vdev, &blkcfg.seg_max,
929 s->conf.seg_max_adjust ? s->conf.queue_size - 2 : 128 - 2);
930 virtio_stw_p(vdev, &blkcfg.geometry.cylinders, conf->cyls);
931 virtio_stl_p(vdev, &blkcfg.blk_size, blk_size);
932 virtio_stw_p(vdev, &blkcfg.min_io_size, conf->min_io_size / blk_size);
933 virtio_stl_p(vdev, &blkcfg.opt_io_size, conf->opt_io_size / blk_size);
934 blkcfg.geometry.heads = conf->heads;
935 /*
936 * We must ensure that the block device capacity is a multiple of
937 * the logical block size. If that is not the case, let's use
938 * sector_mask to adopt the geometry to have a correct picture.
939 * For those devices where the capacity is ok for the given geometry
940 * we don't touch the sector value of the geometry, since some devices
941 * (like s390 dasd) need a specific value. Here the capacity is already
942 * cyls*heads*secs*blk_size and the sector value is not block size
943 * divided by 512 - instead it is the amount of blk_size blocks
944 * per track (cylinder).
945 */
946 length = blk_getlength(s->blk);
947 if (length > 0 && length / conf->heads / conf->secs % blk_size) {
948 blkcfg.geometry.sectors = conf->secs & ~s->sector_mask;
949 } else {
950 blkcfg.geometry.sectors = conf->secs;
951 }
952 blkcfg.size_max = 0;
953 blkcfg.physical_block_exp = get_physical_block_exp(conf);
954 blkcfg.alignment_offset = 0;
955 blkcfg.wce = blk_enable_write_cache(s->blk);
956 virtio_stw_p(vdev, &blkcfg.num_queues, s->conf.num_queues);
957 if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_DISCARD)) {
958 uint32_t discard_granularity = conf->discard_granularity;
959 if (discard_granularity == -1 || !s->conf.report_discard_granularity) {
960 discard_granularity = blk_size;
961 }
962 virtio_stl_p(vdev, &blkcfg.max_discard_sectors,
963 s->conf.max_discard_sectors);
964 virtio_stl_p(vdev, &blkcfg.discard_sector_alignment,
965 discard_granularity >> BDRV_SECTOR_BITS);
966 /*
967 * We support only one segment per request since multiple segments
968 * are not widely used and there are no userspace APIs that allow
969 * applications to submit multiple segments in a single call.
970 */
971 virtio_stl_p(vdev, &blkcfg.max_discard_seg, 1);
972 }
973 if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_WRITE_ZEROES)) {
974 virtio_stl_p(vdev, &blkcfg.max_write_zeroes_sectors,
975 s->conf.max_write_zeroes_sectors);
976 blkcfg.write_zeroes_may_unmap = 1;
977 virtio_stl_p(vdev, &blkcfg.max_write_zeroes_seg, 1);
978 }
979 memcpy(config, &blkcfg, s->config_size);
980 }
981
982 static void virtio_blk_set_config(VirtIODevice *vdev, const uint8_t *config)
983 {
984 VirtIOBlock *s = VIRTIO_BLK(vdev);
985 struct virtio_blk_config blkcfg;
986
987 memcpy(&blkcfg, config, s->config_size);
988
989 aio_context_acquire(blk_get_aio_context(s->blk));
990 blk_set_enable_write_cache(s->blk, blkcfg.wce != 0);
991 aio_context_release(blk_get_aio_context(s->blk));
992 }
993
994 static uint64_t virtio_blk_get_features(VirtIODevice *vdev, uint64_t features,
995 Error **errp)
996 {
997 VirtIOBlock *s = VIRTIO_BLK(vdev);
998
999 /* Firstly sync all virtio-blk possible supported features */
1000 features |= s->host_features;
1001
1002 virtio_add_feature(&features, VIRTIO_BLK_F_SEG_MAX);
1003 virtio_add_feature(&features, VIRTIO_BLK_F_GEOMETRY);
1004 virtio_add_feature(&features, VIRTIO_BLK_F_TOPOLOGY);
1005 virtio_add_feature(&features, VIRTIO_BLK_F_BLK_SIZE);
1006 if (virtio_has_feature(features, VIRTIO_F_VERSION_1)) {
1007 if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_SCSI)) {
1008 error_setg(errp, "Please set scsi=off for virtio-blk devices in order to use virtio 1.0");
1009 return 0;
1010 }
1011 } else {
1012 virtio_clear_feature(&features, VIRTIO_F_ANY_LAYOUT);
1013 virtio_add_feature(&features, VIRTIO_BLK_F_SCSI);
1014 }
1015
1016 if (blk_enable_write_cache(s->blk) ||
1017 (s->conf.x_enable_wce_if_config_wce &&
1018 virtio_has_feature(features, VIRTIO_BLK_F_CONFIG_WCE))) {
1019 virtio_add_feature(&features, VIRTIO_BLK_F_WCE);
1020 }
1021 if (!blk_is_writable(s->blk)) {
1022 virtio_add_feature(&features, VIRTIO_BLK_F_RO);
1023 }
1024 if (s->conf.num_queues > 1) {
1025 virtio_add_feature(&features, VIRTIO_BLK_F_MQ);
1026 }
1027
1028 return features;
1029 }
1030
1031 static void virtio_blk_set_status(VirtIODevice *vdev, uint8_t status)
1032 {
1033 VirtIOBlock *s = VIRTIO_BLK(vdev);
1034
1035 if (!(status & (VIRTIO_CONFIG_S_DRIVER | VIRTIO_CONFIG_S_DRIVER_OK))) {
1036 assert(!s->dataplane_started);
1037 }
1038
1039 if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
1040 return;
1041 }
1042
1043 /* A guest that supports VIRTIO_BLK_F_CONFIG_WCE must be able to send
1044 * cache flushes. Thus, the "auto writethrough" behavior is never
1045 * necessary for guests that support the VIRTIO_BLK_F_CONFIG_WCE feature.
1046 * Leaving it enabled would break the following sequence:
1047 *
1048 * Guest started with "-drive cache=writethrough"
1049 * Guest sets status to 0
1050 * Guest sets DRIVER bit in status field
1051 * Guest reads host features (WCE=0, CONFIG_WCE=1)
1052 * Guest writes guest features (WCE=0, CONFIG_WCE=1)
1053 * Guest writes 1 to the WCE configuration field (writeback mode)
1054 * Guest sets DRIVER_OK bit in status field
1055 *
1056 * s->blk would erroneously be placed in writethrough mode.
1057 */
1058 if (!virtio_vdev_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE)) {
1059 aio_context_acquire(blk_get_aio_context(s->blk));
1060 blk_set_enable_write_cache(s->blk,
1061 virtio_vdev_has_feature(vdev,
1062 VIRTIO_BLK_F_WCE));
1063 aio_context_release(blk_get_aio_context(s->blk));
1064 }
1065 }
1066
1067 static void virtio_blk_save_device(VirtIODevice *vdev, QEMUFile *f)
1068 {
1069 VirtIOBlock *s = VIRTIO_BLK(vdev);
1070 VirtIOBlockReq *req = s->rq;
1071
1072 while (req) {
1073 qemu_put_sbyte(f, 1);
1074
1075 if (s->conf.num_queues > 1) {
1076 qemu_put_be32(f, virtio_get_queue_index(req->vq));
1077 }
1078
1079 qemu_put_virtqueue_element(vdev, f, &req->elem);
1080 req = req->next;
1081 }
1082 qemu_put_sbyte(f, 0);
1083 }
1084
1085 static int virtio_blk_load_device(VirtIODevice *vdev, QEMUFile *f,
1086 int version_id)
1087 {
1088 VirtIOBlock *s = VIRTIO_BLK(vdev);
1089
1090 while (qemu_get_sbyte(f)) {
1091 unsigned nvqs = s->conf.num_queues;
1092 unsigned vq_idx = 0;
1093 VirtIOBlockReq *req;
1094
1095 if (nvqs > 1) {
1096 vq_idx = qemu_get_be32(f);
1097
1098 if (vq_idx >= nvqs) {
1099 error_report("Invalid virtqueue index in request list: %#x",
1100 vq_idx);
1101 return -EINVAL;
1102 }
1103 }
1104
1105 req = qemu_get_virtqueue_element(vdev, f, sizeof(VirtIOBlockReq));
1106 virtio_blk_init_request(s, virtio_get_queue(vdev, vq_idx), req);
1107 req->next = s->rq;
1108 s->rq = req;
1109 }
1110
1111 return 0;
1112 }
1113
1114 static void virtio_resize_cb(void *opaque)
1115 {
1116 VirtIODevice *vdev = opaque;
1117
1118 assert(qemu_get_current_aio_context() == qemu_get_aio_context());
1119 virtio_notify_config(vdev);
1120 }
1121
1122 static void virtio_blk_resize(void *opaque)
1123 {
1124 VirtIODevice *vdev = VIRTIO_DEVICE(opaque);
1125
1126 /*
1127 * virtio_notify_config() needs to acquire the global mutex,
1128 * so it can't be called from an iothread. Instead, schedule
1129 * it to be run in the main context BH.
1130 */
1131 aio_bh_schedule_oneshot(qemu_get_aio_context(), virtio_resize_cb, vdev);
1132 }
1133
1134 static const BlockDevOps virtio_block_ops = {
1135 .resize_cb = virtio_blk_resize,
1136 };
1137
1138 static void virtio_blk_device_realize(DeviceState *dev, Error **errp)
1139 {
1140 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
1141 VirtIOBlock *s = VIRTIO_BLK(dev);
1142 VirtIOBlkConf *conf = &s->conf;
1143 Error *err = NULL;
1144 unsigned i;
1145
1146 if (!conf->conf.blk) {
1147 error_setg(errp, "drive property not set");
1148 return;
1149 }
1150 if (!blk_is_inserted(conf->conf.blk)) {
1151 error_setg(errp, "Device needs media, but drive is empty");
1152 return;
1153 }
1154 if (conf->num_queues == VIRTIO_BLK_AUTO_NUM_QUEUES) {
1155 conf->num_queues = 1;
1156 }
1157 if (!conf->num_queues) {
1158 error_setg(errp, "num-queues property must be larger than 0");
1159 return;
1160 }
1161 if (conf->queue_size <= 2) {
1162 error_setg(errp, "invalid queue-size property (%" PRIu16 "), "
1163 "must be > 2", conf->queue_size);
1164 return;
1165 }
1166 if (!is_power_of_2(conf->queue_size) ||
1167 conf->queue_size > VIRTQUEUE_MAX_SIZE) {
1168 error_setg(errp, "invalid queue-size property (%" PRIu16 "), "
1169 "must be a power of 2 (max %d)",
1170 conf->queue_size, VIRTQUEUE_MAX_SIZE);
1171 return;
1172 }
1173
1174 if (!blkconf_apply_backend_options(&conf->conf,
1175 !blk_supports_write_perm(conf->conf.blk),
1176 true, errp)) {
1177 return;
1178 }
1179 s->original_wce = blk_enable_write_cache(conf->conf.blk);
1180 if (!blkconf_geometry(&conf->conf, NULL, 65535, 255, 255, errp)) {
1181 return;
1182 }
1183
1184 if (!blkconf_blocksizes(&conf->conf, errp)) {
1185 return;
1186 }
1187
1188 if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_DISCARD) &&
1189 (!conf->max_discard_sectors ||
1190 conf->max_discard_sectors > BDRV_REQUEST_MAX_SECTORS)) {
1191 error_setg(errp, "invalid max-discard-sectors property (%" PRIu32 ")"
1192 ", must be between 1 and %d",
1193 conf->max_discard_sectors, (int)BDRV_REQUEST_MAX_SECTORS);
1194 return;
1195 }
1196
1197 if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_WRITE_ZEROES) &&
1198 (!conf->max_write_zeroes_sectors ||
1199 conf->max_write_zeroes_sectors > BDRV_REQUEST_MAX_SECTORS)) {
1200 error_setg(errp, "invalid max-write-zeroes-sectors property (%" PRIu32
1201 "), must be between 1 and %d",
1202 conf->max_write_zeroes_sectors,
1203 (int)BDRV_REQUEST_MAX_SECTORS);
1204 return;
1205 }
1206
1207 virtio_blk_set_config_size(s, s->host_features);
1208
1209 virtio_init(vdev, VIRTIO_ID_BLOCK, s->config_size);
1210
1211 s->blk = conf->conf.blk;
1212 s->rq = NULL;
1213 s->sector_mask = (s->conf.conf.logical_block_size / BDRV_SECTOR_SIZE) - 1;
1214
1215 for (i = 0; i < conf->num_queues; i++) {
1216 virtio_add_queue(vdev, conf->queue_size, virtio_blk_handle_output);
1217 }
1218 qemu_coroutine_inc_pool_size(conf->num_queues * conf->queue_size / 2);
1219 virtio_blk_data_plane_create(vdev, conf, &s->dataplane, &err);
1220 if (err != NULL) {
1221 error_propagate(errp, err);
1222 for (i = 0; i < conf->num_queues; i++) {
1223 virtio_del_queue(vdev, i);
1224 }
1225 virtio_cleanup(vdev);
1226 return;
1227 }
1228
1229 s->change = qemu_add_vm_change_state_handler(virtio_blk_dma_restart_cb, s);
1230 blk_set_dev_ops(s->blk, &virtio_block_ops, s);
1231
1232 blk_iostatus_enable(s->blk);
1233
1234 add_boot_device_lchs(dev, "/disk@0,0",
1235 conf->conf.lcyls,
1236 conf->conf.lheads,
1237 conf->conf.lsecs);
1238 }
1239
1240 static void virtio_blk_device_unrealize(DeviceState *dev)
1241 {
1242 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
1243 VirtIOBlock *s = VIRTIO_BLK(dev);
1244 VirtIOBlkConf *conf = &s->conf;
1245 unsigned i;
1246
1247 blk_drain(s->blk);
1248 del_boot_device_lchs(dev, "/disk@0,0");
1249 virtio_blk_data_plane_destroy(s->dataplane);
1250 s->dataplane = NULL;
1251 for (i = 0; i < conf->num_queues; i++) {
1252 virtio_del_queue(vdev, i);
1253 }
1254 qemu_coroutine_dec_pool_size(conf->num_queues * conf->queue_size / 2);
1255 qemu_del_vm_change_state_handler(s->change);
1256 blockdev_mark_auto_del(s->blk);
1257 virtio_cleanup(vdev);
1258 }
1259
1260 static void virtio_blk_instance_init(Object *obj)
1261 {
1262 VirtIOBlock *s = VIRTIO_BLK(obj);
1263
1264 device_add_bootindex_property(obj, &s->conf.conf.bootindex,
1265 "bootindex", "/disk@0,0",
1266 DEVICE(obj));
1267 }
1268
1269 static const VMStateDescription vmstate_virtio_blk = {
1270 .name = "virtio-blk",
1271 .minimum_version_id = 2,
1272 .version_id = 2,
1273 .fields = (VMStateField[]) {
1274 VMSTATE_VIRTIO_DEVICE,
1275 VMSTATE_END_OF_LIST()
1276 },
1277 };
1278
1279 static Property virtio_blk_properties[] = {
1280 DEFINE_BLOCK_PROPERTIES(VirtIOBlock, conf.conf),
1281 DEFINE_BLOCK_ERROR_PROPERTIES(VirtIOBlock, conf.conf),
1282 DEFINE_BLOCK_CHS_PROPERTIES(VirtIOBlock, conf.conf),
1283 DEFINE_PROP_STRING("serial", VirtIOBlock, conf.serial),
1284 DEFINE_PROP_BIT64("config-wce", VirtIOBlock, host_features,
1285 VIRTIO_BLK_F_CONFIG_WCE, true),
1286 #ifdef __linux__
1287 DEFINE_PROP_BIT64("scsi", VirtIOBlock, host_features,
1288 VIRTIO_BLK_F_SCSI, false),
1289 #endif
1290 DEFINE_PROP_BIT("request-merging", VirtIOBlock, conf.request_merging, 0,
1291 true),
1292 DEFINE_PROP_UINT16("num-queues", VirtIOBlock, conf.num_queues,
1293 VIRTIO_BLK_AUTO_NUM_QUEUES),
1294 DEFINE_PROP_UINT16("queue-size", VirtIOBlock, conf.queue_size, 256),
1295 DEFINE_PROP_BOOL("seg-max-adjust", VirtIOBlock, conf.seg_max_adjust, true),
1296 DEFINE_PROP_LINK("iothread", VirtIOBlock, conf.iothread, TYPE_IOTHREAD,
1297 IOThread *),
1298 DEFINE_PROP_BIT64("discard", VirtIOBlock, host_features,
1299 VIRTIO_BLK_F_DISCARD, true),
1300 DEFINE_PROP_BOOL("report-discard-granularity", VirtIOBlock,
1301 conf.report_discard_granularity, true),
1302 DEFINE_PROP_BIT64("write-zeroes", VirtIOBlock, host_features,
1303 VIRTIO_BLK_F_WRITE_ZEROES, true),
1304 DEFINE_PROP_UINT32("max-discard-sectors", VirtIOBlock,
1305 conf.max_discard_sectors, BDRV_REQUEST_MAX_SECTORS),
1306 DEFINE_PROP_UINT32("max-write-zeroes-sectors", VirtIOBlock,
1307 conf.max_write_zeroes_sectors, BDRV_REQUEST_MAX_SECTORS),
1308 DEFINE_PROP_BOOL("x-enable-wce-if-config-wce", VirtIOBlock,
1309 conf.x_enable_wce_if_config_wce, true),
1310 DEFINE_PROP_END_OF_LIST(),
1311 };
1312
1313 static void virtio_blk_class_init(ObjectClass *klass, void *data)
1314 {
1315 DeviceClass *dc = DEVICE_CLASS(klass);
1316 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
1317
1318 device_class_set_props(dc, virtio_blk_properties);
1319 dc->vmsd = &vmstate_virtio_blk;
1320 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
1321 vdc->realize = virtio_blk_device_realize;
1322 vdc->unrealize = virtio_blk_device_unrealize;
1323 vdc->get_config = virtio_blk_update_config;
1324 vdc->set_config = virtio_blk_set_config;
1325 vdc->get_features = virtio_blk_get_features;
1326 vdc->set_status = virtio_blk_set_status;
1327 vdc->reset = virtio_blk_reset;
1328 vdc->save = virtio_blk_save_device;
1329 vdc->load = virtio_blk_load_device;
1330 vdc->start_ioeventfd = virtio_blk_data_plane_start;
1331 vdc->stop_ioeventfd = virtio_blk_data_plane_stop;
1332 }
1333
1334 static const TypeInfo virtio_blk_info = {
1335 .name = TYPE_VIRTIO_BLK,
1336 .parent = TYPE_VIRTIO_DEVICE,
1337 .instance_size = sizeof(VirtIOBlock),
1338 .instance_init = virtio_blk_instance_init,
1339 .class_init = virtio_blk_class_init,
1340 };
1341
1342 static void virtio_register_types(void)
1343 {
1344 type_register_static(&virtio_blk_info);
1345 }
1346
1347 type_init(virtio_register_types)