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[qemu.git] / hw / virtio-blk.c
CommitLineData
6e02c38d
AL
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
5a61cb60 14#include "qemu-common.h"
d75d25e3 15#include "qemu-error.h"
6d519a5f 16#include "trace.h"
2446333c 17#include "blockdev.h"
6e02c38d 18#include "virtio-blk.h"
5bb23927 19#include "scsi-defs.h"
1063b8b1
CH
20#ifdef __linux__
21# include <scsi/sg.h>
22#endif
6e02c38d
AL
23
24typedef struct VirtIOBlock
25{
26 VirtIODevice vdev;
27 BlockDriverState *bs;
28 VirtQueue *vq;
869a5c6d 29 void *rq;
213189ab 30 QEMUBH *bh;
9752c371 31 BlockConf *conf;
a8686a9b 32 char *serial;
8cfacf07 33 unsigned short sector_mask;
9d0d3138 34 DeviceState *qdev;
6e02c38d
AL
35} VirtIOBlock;
36
37static VirtIOBlock *to_virtio_blk(VirtIODevice *vdev)
38{
39 return (VirtIOBlock *)vdev;
40}
41
42typedef struct VirtIOBlockReq
43{
44 VirtIOBlock *dev;
45 VirtQueueElement elem;
46 struct virtio_blk_inhdr *in;
47 struct virtio_blk_outhdr *out;
1063b8b1 48 struct virtio_scsi_inhdr *scsi;
d28a1b6e 49 QEMUIOVector qiov;
869a5c6d 50 struct VirtIOBlockReq *next;
a597e79c 51 BlockAcctCookie acct;
6e02c38d
AL
52} VirtIOBlockReq;
53
869a5c6d
AL
54static void virtio_blk_req_complete(VirtIOBlockReq *req, int status)
55{
56 VirtIOBlock *s = req->dev;
57
6d519a5f
SH
58 trace_virtio_blk_req_complete(req, status);
59
92e3c2a3 60 stb_p(&req->in->status, status);
d28a1b6e 61 virtqueue_push(s->vq, &req->elem, req->qiov.size + sizeof(*req->in));
869a5c6d 62 virtio_notify(&s->vdev, s->vq);
869a5c6d
AL
63}
64
f35d68f0
KW
65static int virtio_blk_handle_rw_error(VirtIOBlockReq *req, int error,
66 int is_read)
869a5c6d 67{
abd7f68d 68 BlockErrorAction action = bdrv_get_on_error(req->dev->bs, is_read);
869a5c6d
AL
69 VirtIOBlock *s = req->dev;
70
eaa6c85f 71 if (action == BLOCK_ERR_IGNORE) {
908bb949 72 bdrv_mon_event(s->bs, BDRV_ACTION_IGNORE, is_read);
869a5c6d 73 return 0;
eaa6c85f 74 }
869a5c6d
AL
75
76 if ((error == ENOSPC && action == BLOCK_ERR_STOP_ENOSPC)
77 || action == BLOCK_ERR_STOP_ANY) {
78 req->next = s->rq;
79 s->rq = req;
908bb949 80 bdrv_mon_event(s->bs, BDRV_ACTION_STOP, is_read);
0461d5a6 81 vm_stop(RUN_STATE_IO_ERROR);
af239a62 82 bdrv_iostatus_set_err(s->bs, error);
869a5c6d
AL
83 } else {
84 virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR);
a597e79c
CH
85 bdrv_acct_done(s->bs, &req->acct);
86 g_free(req);
908bb949 87 bdrv_mon_event(s->bs, BDRV_ACTION_REPORT, is_read);
869a5c6d
AL
88 }
89
90 return 1;
91}
92
6e02c38d
AL
93static void virtio_blk_rw_complete(void *opaque, int ret)
94{
95 VirtIOBlockReq *req = opaque;
6e02c38d 96
6d519a5f
SH
97 trace_virtio_blk_rw_complete(req, ret);
98
f35d68f0 99 if (ret) {
92e3c2a3 100 int is_read = !(ldl_p(&req->out->type) & VIRTIO_BLK_T_OUT);
f35d68f0 101 if (virtio_blk_handle_rw_error(req, -ret, is_read))
869a5c6d 102 return;
6e02c38d
AL
103 }
104
f35d68f0 105 virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
a597e79c
CH
106 bdrv_acct_done(req->dev->bs, &req->acct);
107 g_free(req);
869a5c6d 108}
6e02c38d 109
aa659be3
CH
110static void virtio_blk_flush_complete(void *opaque, int ret)
111{
112 VirtIOBlockReq *req = opaque;
113
8c269b54
KW
114 if (ret) {
115 if (virtio_blk_handle_rw_error(req, -ret, 0)) {
116 return;
117 }
118 }
119
120 virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
a597e79c
CH
121 bdrv_acct_done(req->dev->bs, &req->acct);
122 g_free(req);
aa659be3
CH
123}
124
869a5c6d
AL
125static VirtIOBlockReq *virtio_blk_alloc_request(VirtIOBlock *s)
126{
7267c094 127 VirtIOBlockReq *req = g_malloc(sizeof(*req));
487414f1 128 req->dev = s;
de6c8042
SH
129 req->qiov.size = 0;
130 req->next = NULL;
869a5c6d 131 return req;
6e02c38d
AL
132}
133
134static VirtIOBlockReq *virtio_blk_get_request(VirtIOBlock *s)
135{
869a5c6d 136 VirtIOBlockReq *req = virtio_blk_alloc_request(s);
6e02c38d 137
869a5c6d
AL
138 if (req != NULL) {
139 if (!virtqueue_pop(s->vq, &req->elem)) {
7267c094 140 g_free(req);
869a5c6d
AL
141 return NULL;
142 }
6e02c38d
AL
143 }
144
145 return req;
146}
147
1063b8b1
CH
148#ifdef __linux__
149static void virtio_blk_handle_scsi(VirtIOBlockReq *req)
150{
151 struct sg_io_hdr hdr;
4277906d 152 int ret;
1063b8b1
CH
153 int status;
154 int i;
155
156 /*
157 * We require at least one output segment each for the virtio_blk_outhdr
158 * and the SCSI command block.
159 *
160 * We also at least require the virtio_blk_inhdr, the virtio_scsi_inhdr
161 * and the sense buffer pointer in the input segments.
162 */
163 if (req->elem.out_num < 2 || req->elem.in_num < 3) {
164 virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR);
a597e79c 165 g_free(req);
1063b8b1
CH
166 return;
167 }
168
169 /*
170 * No support for bidirection commands yet.
171 */
172 if (req->elem.out_num > 2 && req->elem.in_num > 3) {
173 virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP);
a597e79c 174 g_free(req);
1063b8b1
CH
175 return;
176 }
177
178 /*
179 * The scsi inhdr is placed in the second-to-last input segment, just
180 * before the regular inhdr.
181 */
182 req->scsi = (void *)req->elem.in_sg[req->elem.in_num - 2].iov_base;
1063b8b1
CH
183
184 memset(&hdr, 0, sizeof(struct sg_io_hdr));
185 hdr.interface_id = 'S';
186 hdr.cmd_len = req->elem.out_sg[1].iov_len;
187 hdr.cmdp = req->elem.out_sg[1].iov_base;
188 hdr.dxfer_len = 0;
189
190 if (req->elem.out_num > 2) {
191 /*
192 * If there are more than the minimally required 2 output segments
193 * there is write payload starting from the third iovec.
194 */
195 hdr.dxfer_direction = SG_DXFER_TO_DEV;
196 hdr.iovec_count = req->elem.out_num - 2;
197
198 for (i = 0; i < hdr.iovec_count; i++)
199 hdr.dxfer_len += req->elem.out_sg[i + 2].iov_len;
200
201 hdr.dxferp = req->elem.out_sg + 2;
202
203 } else if (req->elem.in_num > 3) {
204 /*
205 * If we have more than 3 input segments the guest wants to actually
206 * read data.
207 */
208 hdr.dxfer_direction = SG_DXFER_FROM_DEV;
209 hdr.iovec_count = req->elem.in_num - 3;
210 for (i = 0; i < hdr.iovec_count; i++)
211 hdr.dxfer_len += req->elem.in_sg[i].iov_len;
212
213 hdr.dxferp = req->elem.in_sg;
1063b8b1
CH
214 } else {
215 /*
216 * Some SCSI commands don't actually transfer any data.
217 */
218 hdr.dxfer_direction = SG_DXFER_NONE;
219 }
220
221 hdr.sbp = req->elem.in_sg[req->elem.in_num - 3].iov_base;
222 hdr.mx_sb_len = req->elem.in_sg[req->elem.in_num - 3].iov_len;
1063b8b1
CH
223
224 ret = bdrv_ioctl(req->dev->bs, SG_IO, &hdr);
225 if (ret) {
226 status = VIRTIO_BLK_S_UNSUPP;
227 hdr.status = ret;
228 hdr.resid = hdr.dxfer_len;
229 } else if (hdr.status) {
230 status = VIRTIO_BLK_S_IOERR;
231 } else {
232 status = VIRTIO_BLK_S_OK;
233 }
234
5bb23927
PB
235 /*
236 * From SCSI-Generic-HOWTO: "Some lower level drivers (e.g. ide-scsi)
237 * clear the masked_status field [hence status gets cleared too, see
238 * block/scsi_ioctl.c] even when a CHECK_CONDITION or COMMAND_TERMINATED
239 * status has occurred. However they do set DRIVER_SENSE in driver_status
240 * field. Also a (sb_len_wr > 0) indicates there is a sense buffer.
241 */
242 if (hdr.status == 0 && hdr.sb_len_wr > 0) {
243 hdr.status = CHECK_CONDITION;
244 }
245
246 stl_p(&req->scsi->errors,
247 hdr.status | (hdr.msg_status << 8) |
248 (hdr.host_status << 16) | (hdr.driver_status << 24));
92e3c2a3
AJ
249 stl_p(&req->scsi->residual, hdr.resid);
250 stl_p(&req->scsi->sense_len, hdr.sb_len_wr);
251 stl_p(&req->scsi->data_len, hdr.dxfer_len);
1063b8b1
CH
252
253 virtio_blk_req_complete(req, status);
a597e79c 254 g_free(req);
1063b8b1
CH
255}
256#else
257static void virtio_blk_handle_scsi(VirtIOBlockReq *req)
258{
259 virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP);
a597e79c 260 g_free(req);
1063b8b1
CH
261}
262#endif /* __linux__ */
263
c20fd872
CH
264typedef struct MultiReqBuffer {
265 BlockRequest blkreq[32];
266 unsigned int num_writes;
267} MultiReqBuffer;
268
269static void virtio_submit_multiwrite(BlockDriverState *bs, MultiReqBuffer *mrb)
869a5c6d 270{
91553dcc 271 int i, ret;
91553dcc 272
c20fd872
CH
273 if (!mrb->num_writes) {
274 return;
275 }
276
277 ret = bdrv_aio_multiwrite(bs, mrb->blkreq, mrb->num_writes);
91553dcc 278 if (ret != 0) {
c20fd872
CH
279 for (i = 0; i < mrb->num_writes; i++) {
280 if (mrb->blkreq[i].error) {
281 virtio_blk_rw_complete(mrb->blkreq[i].opaque, -EIO);
91553dcc
KW
282 }
283 }
284 }
c20fd872
CH
285
286 mrb->num_writes = 0;
91553dcc 287}
87b245db 288
c20fd872 289static void virtio_blk_handle_flush(VirtIOBlockReq *req, MultiReqBuffer *mrb)
aa659be3
CH
290{
291 BlockDriverAIOCB *acb;
292
a597e79c
CH
293 bdrv_acct_start(req->dev->bs, &req->acct, 0, BDRV_ACCT_FLUSH);
294
618fbb84
CH
295 /*
296 * Make sure all outstanding writes are posted to the backing device.
297 */
c20fd872 298 virtio_submit_multiwrite(req->dev->bs, mrb);
618fbb84 299
aa659be3
CH
300 acb = bdrv_aio_flush(req->dev->bs, virtio_blk_flush_complete, req);
301 if (!acb) {
18a8d421 302 virtio_blk_flush_complete(req, -EIO);
aa659be3
CH
303 }
304}
305
c20fd872 306static void virtio_blk_handle_write(VirtIOBlockReq *req, MultiReqBuffer *mrb)
91553dcc 307{
c20fd872 308 BlockRequest *blkreq;
92e3c2a3 309 uint64_t sector;
c20fd872 310
92e3c2a3 311 sector = ldq_p(&req->out->sector);
6d519a5f 312
a597e79c
CH
313 bdrv_acct_start(req->dev->bs, &req->acct, req->qiov.size, BDRV_ACCT_WRITE);
314
92e3c2a3
AJ
315 trace_virtio_blk_handle_write(req, sector, req->qiov.size / 512);
316
317 if (sector & req->dev->sector_mask) {
8cfacf07
CH
318 virtio_blk_rw_complete(req, -EIO);
319 return;
320 }
52c05023
CH
321 if (req->qiov.size % req->dev->conf->logical_block_size) {
322 virtio_blk_rw_complete(req, -EIO);
323 return;
324 }
8cfacf07 325
c20fd872
CH
326 if (mrb->num_writes == 32) {
327 virtio_submit_multiwrite(req->dev->bs, mrb);
87b245db 328 }
91553dcc 329
c20fd872 330 blkreq = &mrb->blkreq[mrb->num_writes];
92e3c2a3 331 blkreq->sector = sector;
c20fd872
CH
332 blkreq->nb_sectors = req->qiov.size / BDRV_SECTOR_SIZE;
333 blkreq->qiov = &req->qiov;
334 blkreq->cb = virtio_blk_rw_complete;
335 blkreq->opaque = req;
336 blkreq->error = 0;
91553dcc 337
c20fd872 338 mrb->num_writes++;
d28a1b6e 339}
869a5c6d 340
d28a1b6e
AL
341static void virtio_blk_handle_read(VirtIOBlockReq *req)
342{
87b245db 343 BlockDriverAIOCB *acb;
92e3c2a3
AJ
344 uint64_t sector;
345
346 sector = ldq_p(&req->out->sector);
87b245db 347
a597e79c
CH
348 bdrv_acct_start(req->dev->bs, &req->acct, req->qiov.size, BDRV_ACCT_READ);
349
92e3c2a3 350 if (sector & req->dev->sector_mask) {
8cfacf07
CH
351 virtio_blk_rw_complete(req, -EIO);
352 return;
353 }
52c05023
CH
354 if (req->qiov.size % req->dev->conf->logical_block_size) {
355 virtio_blk_rw_complete(req, -EIO);
356 return;
357 }
8cfacf07 358
92e3c2a3 359 acb = bdrv_aio_readv(req->dev->bs, sector, &req->qiov,
1573a35d
JS
360 req->qiov.size / BDRV_SECTOR_SIZE,
361 virtio_blk_rw_complete, req);
87b245db 362 if (!acb) {
6c510fbf 363 virtio_blk_rw_complete(req, -EIO);
87b245db 364 }
869a5c6d
AL
365}
366
bc6694d4
KW
367static void virtio_blk_handle_request(VirtIOBlockReq *req,
368 MultiReqBuffer *mrb)
369{
92e3c2a3
AJ
370 uint32_t type;
371
bc6694d4 372 if (req->elem.out_num < 1 || req->elem.in_num < 1) {
870cef1d 373 error_report("virtio-blk missing headers");
bc6694d4
KW
374 exit(1);
375 }
376
377 if (req->elem.out_sg[0].iov_len < sizeof(*req->out) ||
378 req->elem.in_sg[req->elem.in_num - 1].iov_len < sizeof(*req->in)) {
870cef1d 379 error_report("virtio-blk header not in correct element");
bc6694d4
KW
380 exit(1);
381 }
382
383 req->out = (void *)req->elem.out_sg[0].iov_base;
384 req->in = (void *)req->elem.in_sg[req->elem.in_num - 1].iov_base;
385
92e3c2a3
AJ
386 type = ldl_p(&req->out->type);
387
388 if (type & VIRTIO_BLK_T_FLUSH) {
c20fd872 389 virtio_blk_handle_flush(req, mrb);
92e3c2a3 390 } else if (type & VIRTIO_BLK_T_SCSI_CMD) {
bc6694d4 391 virtio_blk_handle_scsi(req);
92e3c2a3 392 } else if (type & VIRTIO_BLK_T_GET_ID) {
2930b313 393 VirtIOBlock *s = req->dev;
394
a8686a9b
MA
395 /*
396 * NB: per existing s/n string convention the string is
397 * terminated by '\0' only when shorter than buffer.
398 */
399 strncpy(req->elem.in_sg[0].iov_base,
400 s->serial ? s->serial : "",
401 MIN(req->elem.in_sg[0].iov_len, VIRTIO_BLK_ID_BYTES));
2930b313 402 virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
a597e79c 403 g_free(req);
92e3c2a3 404 } else if (type & VIRTIO_BLK_T_OUT) {
bc6694d4
KW
405 qemu_iovec_init_external(&req->qiov, &req->elem.out_sg[1],
406 req->elem.out_num - 1);
c20fd872 407 virtio_blk_handle_write(req, mrb);
bc6694d4
KW
408 } else {
409 qemu_iovec_init_external(&req->qiov, &req->elem.in_sg[0],
410 req->elem.in_num - 1);
411 virtio_blk_handle_read(req);
412 }
413}
414
6e02c38d
AL
415static void virtio_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq)
416{
417 VirtIOBlock *s = to_virtio_blk(vdev);
418 VirtIOBlockReq *req;
bc6694d4
KW
419 MultiReqBuffer mrb = {
420 .num_writes = 0,
bc6694d4 421 };
6e02c38d
AL
422
423 while ((req = virtio_blk_get_request(s))) {
bc6694d4 424 virtio_blk_handle_request(req, &mrb);
6e02c38d 425 }
91553dcc 426
c20fd872 427 virtio_submit_multiwrite(s->bs, &mrb);
91553dcc 428
6e02c38d
AL
429 /*
430 * FIXME: Want to check for completions before returning to guest mode,
431 * so cached reads and writes are reported as quickly as possible. But
432 * that should be done in the generic block layer.
433 */
434}
435
213189ab 436static void virtio_blk_dma_restart_bh(void *opaque)
869a5c6d
AL
437{
438 VirtIOBlock *s = opaque;
439 VirtIOBlockReq *req = s->rq;
f1b52868
KW
440 MultiReqBuffer mrb = {
441 .num_writes = 0,
f1b52868 442 };
869a5c6d 443
213189ab
MA
444 qemu_bh_delete(s->bh);
445 s->bh = NULL;
869a5c6d
AL
446
447 s->rq = NULL;
448
449 while (req) {
f1b52868 450 virtio_blk_handle_request(req, &mrb);
869a5c6d
AL
451 req = req->next;
452 }
f1b52868 453
c20fd872 454 virtio_submit_multiwrite(s->bs, &mrb);
869a5c6d
AL
455}
456
1dfb4dd9
LC
457static void virtio_blk_dma_restart_cb(void *opaque, int running,
458 RunState state)
213189ab
MA
459{
460 VirtIOBlock *s = opaque;
461
462 if (!running)
463 return;
464
465 if (!s->bh) {
466 s->bh = qemu_bh_new(virtio_blk_dma_restart_bh, s);
467 qemu_bh_schedule(s->bh);
468 }
469}
470
6e02c38d
AL
471static void virtio_blk_reset(VirtIODevice *vdev)
472{
473 /*
474 * This should cancel pending requests, but can't do nicely until there
475 * are per-device request lists.
476 */
477 qemu_aio_flush();
478}
479
bf011293 480/* coalesce internal state, copy to pci i/o region 0
481 */
6e02c38d
AL
482static void virtio_blk_update_config(VirtIODevice *vdev, uint8_t *config)
483{
484 VirtIOBlock *s = to_virtio_blk(vdev);
485 struct virtio_blk_config blkcfg;
486 uint64_t capacity;
487 int cylinders, heads, secs;
488
489 bdrv_get_geometry(s->bs, &capacity);
490 bdrv_get_geometry_hint(s->bs, &cylinders, &heads, &secs);
5c5dafdc 491 memset(&blkcfg, 0, sizeof(blkcfg));
6e02c38d
AL
492 stq_raw(&blkcfg.capacity, capacity);
493 stl_raw(&blkcfg.seg_max, 128 - 2);
494 stw_raw(&blkcfg.cylinders, cylinders);
495 blkcfg.heads = heads;
8cfacf07
CH
496 blkcfg.sectors = secs & ~s->sector_mask;
497 blkcfg.blk_size = s->conf->logical_block_size;
c7085da7 498 blkcfg.size_max = 0;
9752c371
CH
499 blkcfg.physical_block_exp = get_physical_block_exp(s->conf);
500 blkcfg.alignment_offset = 0;
8cfacf07
CH
501 blkcfg.min_io_size = s->conf->min_io_size / blkcfg.blk_size;
502 blkcfg.opt_io_size = s->conf->opt_io_size / blkcfg.blk_size;
37d5ddd6 503 memcpy(config, &blkcfg, sizeof(struct virtio_blk_config));
6e02c38d
AL
504}
505
8172539d 506static uint32_t virtio_blk_get_features(VirtIODevice *vdev, uint32_t features)
6e02c38d 507{
bf011293 508 VirtIOBlock *s = to_virtio_blk(vdev);
1063b8b1
CH
509
510 features |= (1 << VIRTIO_BLK_F_SEG_MAX);
511 features |= (1 << VIRTIO_BLK_F_GEOMETRY);
9752c371 512 features |= (1 << VIRTIO_BLK_F_TOPOLOGY);
8cfacf07 513 features |= (1 << VIRTIO_BLK_F_BLK_SIZE);
aa659be3
CH
514
515 if (bdrv_enable_write_cache(s->bs))
516 features |= (1 << VIRTIO_BLK_F_WCACHE);
c79662f7
NS
517
518 if (bdrv_is_read_only(s->bs))
519 features |= 1 << VIRTIO_BLK_F_RO;
1063b8b1
CH
520
521 return features;
6e02c38d
AL
522}
523
524static void virtio_blk_save(QEMUFile *f, void *opaque)
525{
526 VirtIOBlock *s = opaque;
869a5c6d
AL
527 VirtIOBlockReq *req = s->rq;
528
6e02c38d 529 virtio_save(&s->vdev, f);
869a5c6d
AL
530
531 while (req) {
532 qemu_put_sbyte(f, 1);
533 qemu_put_buffer(f, (unsigned char*)&req->elem, sizeof(req->elem));
534 req = req->next;
535 }
536 qemu_put_sbyte(f, 0);
6e02c38d
AL
537}
538
539static int virtio_blk_load(QEMUFile *f, void *opaque, int version_id)
540{
541 VirtIOBlock *s = opaque;
542
869a5c6d 543 if (version_id != 2)
6e02c38d
AL
544 return -EINVAL;
545
546 virtio_load(&s->vdev, f);
869a5c6d
AL
547 while (qemu_get_sbyte(f)) {
548 VirtIOBlockReq *req = virtio_blk_alloc_request(s);
549 qemu_get_buffer(f, (unsigned char*)&req->elem, sizeof(req->elem));
550 req->next = s->rq;
20a81e4d 551 s->rq = req;
b6a4805b
KW
552
553 virtqueue_map_sg(req->elem.in_sg, req->elem.in_addr,
554 req->elem.in_num, 1);
555 virtqueue_map_sg(req->elem.out_sg, req->elem.out_addr,
556 req->elem.out_num, 0);
869a5c6d 557 }
6e02c38d
AL
558
559 return 0;
560}
561
145feb17 562static void virtio_blk_resize(void *opaque)
e5051fc7
CH
563{
564 VirtIOBlock *s = opaque;
565
145feb17 566 virtio_notify_config(&s->vdev);
e5051fc7
CH
567}
568
0e49de52 569static const BlockDevOps virtio_block_ops = {
145feb17 570 .resize_cb = virtio_blk_resize,
0e49de52
MA
571};
572
a8686a9b
MA
573VirtIODevice *virtio_blk_init(DeviceState *dev, BlockConf *conf,
574 char **serial)
6e02c38d
AL
575{
576 VirtIOBlock *s;
577 int cylinders, heads, secs;
578 static int virtio_blk_id;
2930b313 579 DriveInfo *dinfo;
cf21e106 580
d75d25e3
MA
581 if (!conf->bs) {
582 error_report("virtio-blk-pci: drive property not set");
583 return NULL;
584 }
98f28ad7
MA
585 if (!bdrv_is_inserted(conf->bs)) {
586 error_report("Device needs media, but drive is empty");
587 return NULL;
588 }
d75d25e3 589
a8686a9b
MA
590 if (!*serial) {
591 /* try to fall back to value set with legacy -drive serial=... */
592 dinfo = drive_get_by_blockdev(conf->bs);
593 if (*dinfo->serial) {
594 *serial = strdup(dinfo->serial);
595 }
596 }
597
53c25cea 598 s = (VirtIOBlock *)virtio_common_init("virtio-blk", VIRTIO_ID_BLOCK,
37d5ddd6 599 sizeof(struct virtio_blk_config),
53c25cea 600 sizeof(VirtIOBlock));
6e02c38d
AL
601
602 s->vdev.get_config = virtio_blk_update_config;
603 s->vdev.get_features = virtio_blk_get_features;
604 s->vdev.reset = virtio_blk_reset;
f8b6cc00 605 s->bs = conf->bs;
9752c371 606 s->conf = conf;
a8686a9b 607 s->serial = *serial;
869a5c6d 608 s->rq = NULL;
1573a35d 609 s->sector_mask = (s->conf->logical_block_size / BDRV_SECTOR_SIZE) - 1;
6e02c38d 610 bdrv_guess_geometry(s->bs, &cylinders, &heads, &secs);
6e02c38d
AL
611
612 s->vq = virtio_add_queue(&s->vdev, 128, virtio_blk_handle_output);
613
869a5c6d 614 qemu_add_vm_change_state_handler(virtio_blk_dma_restart_cb, s);
9d0d3138 615 s->qdev = dev;
0be71e32 616 register_savevm(dev, "virtio-blk", virtio_blk_id++, 2,
6e02c38d 617 virtio_blk_save, virtio_blk_load, s);
0e49de52 618 bdrv_set_dev_ops(s->bs, &virtio_block_ops, s);
7b6f9300 619 bdrv_set_buffer_alignment(s->bs, conf->logical_block_size);
6e02c38d 620
af239a62 621 bdrv_iostatus_enable(s->bs);
1ca4d09a
GN
622 add_boot_device_path(conf->bootindex, dev, "/disk@0,0");
623
53c25cea 624 return &s->vdev;
6e02c38d 625}
9d0d3138
AW
626
627void virtio_blk_exit(VirtIODevice *vdev)
628{
629 VirtIOBlock *s = to_virtio_blk(vdev);
630 unregister_savevm(s->qdev, "virtio-blk", s);
d92551f2 631 virtio_cleanup(vdev);
9d0d3138 632}