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Commit | Line | Data |
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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 | ||
869a5c6d | 14 | #include <qemu-common.h> |
d75d25e3 | 15 | #include "qemu-error.h" |
6e02c38d | 16 | #include "virtio-blk.h" |
1063b8b1 CH |
17 | #ifdef __linux__ |
18 | # include <scsi/sg.h> | |
19 | #endif | |
6e02c38d AL |
20 | |
21 | typedef struct VirtIOBlock | |
22 | { | |
23 | VirtIODevice vdev; | |
24 | BlockDriverState *bs; | |
25 | VirtQueue *vq; | |
869a5c6d | 26 | void *rq; |
213189ab | 27 | QEMUBH *bh; |
9752c371 | 28 | BlockConf *conf; |
8cfacf07 | 29 | unsigned short sector_mask; |
2930b313 | 30 | char sn[BLOCK_SERIAL_STRLEN]; |
6e02c38d AL |
31 | } VirtIOBlock; |
32 | ||
33 | static VirtIOBlock *to_virtio_blk(VirtIODevice *vdev) | |
34 | { | |
35 | return (VirtIOBlock *)vdev; | |
36 | } | |
37 | ||
38 | typedef struct VirtIOBlockReq | |
39 | { | |
40 | VirtIOBlock *dev; | |
41 | VirtQueueElement elem; | |
42 | struct virtio_blk_inhdr *in; | |
43 | struct virtio_blk_outhdr *out; | |
1063b8b1 | 44 | struct virtio_scsi_inhdr *scsi; |
d28a1b6e | 45 | QEMUIOVector qiov; |
869a5c6d | 46 | struct VirtIOBlockReq *next; |
6e02c38d AL |
47 | } VirtIOBlockReq; |
48 | ||
869a5c6d AL |
49 | static void virtio_blk_req_complete(VirtIOBlockReq *req, int status) |
50 | { | |
51 | VirtIOBlock *s = req->dev; | |
52 | ||
53 | req->in->status = status; | |
d28a1b6e | 54 | virtqueue_push(s->vq, &req->elem, req->qiov.size + sizeof(*req->in)); |
869a5c6d AL |
55 | virtio_notify(&s->vdev, s->vq); |
56 | ||
869a5c6d AL |
57 | qemu_free(req); |
58 | } | |
59 | ||
f35d68f0 KW |
60 | static int virtio_blk_handle_rw_error(VirtIOBlockReq *req, int error, |
61 | int is_read) | |
869a5c6d | 62 | { |
abd7f68d | 63 | BlockErrorAction action = bdrv_get_on_error(req->dev->bs, is_read); |
869a5c6d AL |
64 | VirtIOBlock *s = req->dev; |
65 | ||
eaa6c85f | 66 | if (action == BLOCK_ERR_IGNORE) { |
908bb949 | 67 | bdrv_mon_event(s->bs, BDRV_ACTION_IGNORE, is_read); |
869a5c6d | 68 | return 0; |
eaa6c85f | 69 | } |
869a5c6d AL |
70 | |
71 | if ((error == ENOSPC && action == BLOCK_ERR_STOP_ENOSPC) | |
72 | || action == BLOCK_ERR_STOP_ANY) { | |
73 | req->next = s->rq; | |
74 | s->rq = req; | |
908bb949 | 75 | bdrv_mon_event(s->bs, BDRV_ACTION_STOP, is_read); |
554a310b | 76 | vm_stop(0); |
869a5c6d AL |
77 | } else { |
78 | virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR); | |
908bb949 | 79 | bdrv_mon_event(s->bs, BDRV_ACTION_REPORT, is_read); |
869a5c6d AL |
80 | } |
81 | ||
82 | return 1; | |
83 | } | |
84 | ||
6e02c38d AL |
85 | static void virtio_blk_rw_complete(void *opaque, int ret) |
86 | { | |
87 | VirtIOBlockReq *req = opaque; | |
6e02c38d | 88 | |
f35d68f0 KW |
89 | if (ret) { |
90 | int is_read = !(req->out->type & VIRTIO_BLK_T_OUT); | |
91 | if (virtio_blk_handle_rw_error(req, -ret, is_read)) | |
869a5c6d | 92 | return; |
6e02c38d AL |
93 | } |
94 | ||
f35d68f0 | 95 | virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); |
869a5c6d | 96 | } |
6e02c38d | 97 | |
aa659be3 CH |
98 | static void virtio_blk_flush_complete(void *opaque, int ret) |
99 | { | |
100 | VirtIOBlockReq *req = opaque; | |
101 | ||
102 | virtio_blk_req_complete(req, ret ? VIRTIO_BLK_S_IOERR : VIRTIO_BLK_S_OK); | |
103 | } | |
104 | ||
869a5c6d AL |
105 | static VirtIOBlockReq *virtio_blk_alloc_request(VirtIOBlock *s) |
106 | { | |
de6c8042 | 107 | VirtIOBlockReq *req = qemu_malloc(sizeof(*req)); |
487414f1 | 108 | req->dev = s; |
de6c8042 SH |
109 | req->qiov.size = 0; |
110 | req->next = NULL; | |
869a5c6d | 111 | return req; |
6e02c38d AL |
112 | } |
113 | ||
114 | static VirtIOBlockReq *virtio_blk_get_request(VirtIOBlock *s) | |
115 | { | |
869a5c6d | 116 | VirtIOBlockReq *req = virtio_blk_alloc_request(s); |
6e02c38d | 117 | |
869a5c6d AL |
118 | if (req != NULL) { |
119 | if (!virtqueue_pop(s->vq, &req->elem)) { | |
120 | qemu_free(req); | |
121 | return NULL; | |
122 | } | |
6e02c38d AL |
123 | } |
124 | ||
125 | return req; | |
126 | } | |
127 | ||
1063b8b1 CH |
128 | #ifdef __linux__ |
129 | static void virtio_blk_handle_scsi(VirtIOBlockReq *req) | |
130 | { | |
131 | struct sg_io_hdr hdr; | |
4277906d | 132 | int ret; |
1063b8b1 CH |
133 | int status; |
134 | int i; | |
135 | ||
136 | /* | |
137 | * We require at least one output segment each for the virtio_blk_outhdr | |
138 | * and the SCSI command block. | |
139 | * | |
140 | * We also at least require the virtio_blk_inhdr, the virtio_scsi_inhdr | |
141 | * and the sense buffer pointer in the input segments. | |
142 | */ | |
143 | if (req->elem.out_num < 2 || req->elem.in_num < 3) { | |
144 | virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR); | |
145 | return; | |
146 | } | |
147 | ||
148 | /* | |
149 | * No support for bidirection commands yet. | |
150 | */ | |
151 | if (req->elem.out_num > 2 && req->elem.in_num > 3) { | |
152 | virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP); | |
153 | return; | |
154 | } | |
155 | ||
156 | /* | |
157 | * The scsi inhdr is placed in the second-to-last input segment, just | |
158 | * before the regular inhdr. | |
159 | */ | |
160 | req->scsi = (void *)req->elem.in_sg[req->elem.in_num - 2].iov_base; | |
1063b8b1 CH |
161 | |
162 | memset(&hdr, 0, sizeof(struct sg_io_hdr)); | |
163 | hdr.interface_id = 'S'; | |
164 | hdr.cmd_len = req->elem.out_sg[1].iov_len; | |
165 | hdr.cmdp = req->elem.out_sg[1].iov_base; | |
166 | hdr.dxfer_len = 0; | |
167 | ||
168 | if (req->elem.out_num > 2) { | |
169 | /* | |
170 | * If there are more than the minimally required 2 output segments | |
171 | * there is write payload starting from the third iovec. | |
172 | */ | |
173 | hdr.dxfer_direction = SG_DXFER_TO_DEV; | |
174 | hdr.iovec_count = req->elem.out_num - 2; | |
175 | ||
176 | for (i = 0; i < hdr.iovec_count; i++) | |
177 | hdr.dxfer_len += req->elem.out_sg[i + 2].iov_len; | |
178 | ||
179 | hdr.dxferp = req->elem.out_sg + 2; | |
180 | ||
181 | } else if (req->elem.in_num > 3) { | |
182 | /* | |
183 | * If we have more than 3 input segments the guest wants to actually | |
184 | * read data. | |
185 | */ | |
186 | hdr.dxfer_direction = SG_DXFER_FROM_DEV; | |
187 | hdr.iovec_count = req->elem.in_num - 3; | |
188 | for (i = 0; i < hdr.iovec_count; i++) | |
189 | hdr.dxfer_len += req->elem.in_sg[i].iov_len; | |
190 | ||
191 | hdr.dxferp = req->elem.in_sg; | |
1063b8b1 CH |
192 | } else { |
193 | /* | |
194 | * Some SCSI commands don't actually transfer any data. | |
195 | */ | |
196 | hdr.dxfer_direction = SG_DXFER_NONE; | |
197 | } | |
198 | ||
199 | hdr.sbp = req->elem.in_sg[req->elem.in_num - 3].iov_base; | |
200 | hdr.mx_sb_len = req->elem.in_sg[req->elem.in_num - 3].iov_len; | |
1063b8b1 CH |
201 | |
202 | ret = bdrv_ioctl(req->dev->bs, SG_IO, &hdr); | |
203 | if (ret) { | |
204 | status = VIRTIO_BLK_S_UNSUPP; | |
205 | hdr.status = ret; | |
206 | hdr.resid = hdr.dxfer_len; | |
207 | } else if (hdr.status) { | |
208 | status = VIRTIO_BLK_S_IOERR; | |
209 | } else { | |
210 | status = VIRTIO_BLK_S_OK; | |
211 | } | |
212 | ||
213 | req->scsi->errors = hdr.status; | |
214 | req->scsi->residual = hdr.resid; | |
215 | req->scsi->sense_len = hdr.sb_len_wr; | |
216 | req->scsi->data_len = hdr.dxfer_len; | |
217 | ||
218 | virtio_blk_req_complete(req, status); | |
219 | } | |
220 | #else | |
221 | static void virtio_blk_handle_scsi(VirtIOBlockReq *req) | |
222 | { | |
223 | virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP); | |
224 | } | |
225 | #endif /* __linux__ */ | |
226 | ||
c20fd872 CH |
227 | typedef struct MultiReqBuffer { |
228 | BlockRequest blkreq[32]; | |
229 | unsigned int num_writes; | |
230 | } MultiReqBuffer; | |
231 | ||
232 | static void virtio_submit_multiwrite(BlockDriverState *bs, MultiReqBuffer *mrb) | |
869a5c6d | 233 | { |
91553dcc | 234 | int i, ret; |
91553dcc | 235 | |
c20fd872 CH |
236 | if (!mrb->num_writes) { |
237 | return; | |
238 | } | |
239 | ||
240 | ret = bdrv_aio_multiwrite(bs, mrb->blkreq, mrb->num_writes); | |
91553dcc | 241 | if (ret != 0) { |
c20fd872 CH |
242 | for (i = 0; i < mrb->num_writes; i++) { |
243 | if (mrb->blkreq[i].error) { | |
244 | virtio_blk_rw_complete(mrb->blkreq[i].opaque, -EIO); | |
91553dcc KW |
245 | } |
246 | } | |
247 | } | |
c20fd872 CH |
248 | |
249 | mrb->num_writes = 0; | |
91553dcc | 250 | } |
87b245db | 251 | |
c20fd872 | 252 | static void virtio_blk_handle_flush(VirtIOBlockReq *req, MultiReqBuffer *mrb) |
aa659be3 CH |
253 | { |
254 | BlockDriverAIOCB *acb; | |
255 | ||
618fbb84 CH |
256 | /* |
257 | * Make sure all outstanding writes are posted to the backing device. | |
258 | */ | |
c20fd872 | 259 | virtio_submit_multiwrite(req->dev->bs, mrb); |
618fbb84 | 260 | |
aa659be3 CH |
261 | acb = bdrv_aio_flush(req->dev->bs, virtio_blk_flush_complete, req); |
262 | if (!acb) { | |
263 | virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR); | |
264 | } | |
265 | } | |
266 | ||
c20fd872 | 267 | static void virtio_blk_handle_write(VirtIOBlockReq *req, MultiReqBuffer *mrb) |
91553dcc | 268 | { |
c20fd872 CH |
269 | BlockRequest *blkreq; |
270 | ||
8cfacf07 CH |
271 | if (req->out->sector & req->dev->sector_mask) { |
272 | virtio_blk_rw_complete(req, -EIO); | |
273 | return; | |
274 | } | |
275 | ||
c20fd872 CH |
276 | if (mrb->num_writes == 32) { |
277 | virtio_submit_multiwrite(req->dev->bs, mrb); | |
87b245db | 278 | } |
91553dcc | 279 | |
c20fd872 CH |
280 | blkreq = &mrb->blkreq[mrb->num_writes]; |
281 | blkreq->sector = req->out->sector; | |
282 | blkreq->nb_sectors = req->qiov.size / BDRV_SECTOR_SIZE; | |
283 | blkreq->qiov = &req->qiov; | |
284 | blkreq->cb = virtio_blk_rw_complete; | |
285 | blkreq->opaque = req; | |
286 | blkreq->error = 0; | |
91553dcc | 287 | |
c20fd872 | 288 | mrb->num_writes++; |
d28a1b6e | 289 | } |
869a5c6d | 290 | |
d28a1b6e AL |
291 | static void virtio_blk_handle_read(VirtIOBlockReq *req) |
292 | { | |
87b245db CH |
293 | BlockDriverAIOCB *acb; |
294 | ||
8cfacf07 CH |
295 | if (req->out->sector & req->dev->sector_mask) { |
296 | virtio_blk_rw_complete(req, -EIO); | |
297 | return; | |
298 | } | |
299 | ||
87b245db | 300 | acb = bdrv_aio_readv(req->dev->bs, req->out->sector, &req->qiov, |
1573a35d JS |
301 | req->qiov.size / BDRV_SECTOR_SIZE, |
302 | virtio_blk_rw_complete, req); | |
87b245db | 303 | if (!acb) { |
6c510fbf | 304 | virtio_blk_rw_complete(req, -EIO); |
87b245db | 305 | } |
869a5c6d AL |
306 | } |
307 | ||
bc6694d4 KW |
308 | static void virtio_blk_handle_request(VirtIOBlockReq *req, |
309 | MultiReqBuffer *mrb) | |
310 | { | |
311 | if (req->elem.out_num < 1 || req->elem.in_num < 1) { | |
312 | fprintf(stderr, "virtio-blk missing headers\n"); | |
313 | exit(1); | |
314 | } | |
315 | ||
316 | if (req->elem.out_sg[0].iov_len < sizeof(*req->out) || | |
317 | req->elem.in_sg[req->elem.in_num - 1].iov_len < sizeof(*req->in)) { | |
318 | fprintf(stderr, "virtio-blk header not in correct element\n"); | |
319 | exit(1); | |
320 | } | |
321 | ||
322 | req->out = (void *)req->elem.out_sg[0].iov_base; | |
323 | req->in = (void *)req->elem.in_sg[req->elem.in_num - 1].iov_base; | |
324 | ||
325 | if (req->out->type & VIRTIO_BLK_T_FLUSH) { | |
c20fd872 | 326 | virtio_blk_handle_flush(req, mrb); |
bc6694d4 KW |
327 | } else if (req->out->type & VIRTIO_BLK_T_SCSI_CMD) { |
328 | virtio_blk_handle_scsi(req); | |
2930b313 | 329 | } else if (req->out->type & VIRTIO_BLK_T_GET_ID) { |
330 | VirtIOBlock *s = req->dev; | |
331 | ||
332 | memcpy(req->elem.in_sg[0].iov_base, s->sn, | |
333 | MIN(req->elem.in_sg[0].iov_len, sizeof(s->sn))); | |
334 | virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); | |
bc6694d4 KW |
335 | } else if (req->out->type & VIRTIO_BLK_T_OUT) { |
336 | qemu_iovec_init_external(&req->qiov, &req->elem.out_sg[1], | |
337 | req->elem.out_num - 1); | |
c20fd872 | 338 | virtio_blk_handle_write(req, mrb); |
bc6694d4 KW |
339 | } else { |
340 | qemu_iovec_init_external(&req->qiov, &req->elem.in_sg[0], | |
341 | req->elem.in_num - 1); | |
342 | virtio_blk_handle_read(req); | |
343 | } | |
344 | } | |
345 | ||
6e02c38d AL |
346 | static void virtio_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq) |
347 | { | |
348 | VirtIOBlock *s = to_virtio_blk(vdev); | |
349 | VirtIOBlockReq *req; | |
bc6694d4 KW |
350 | MultiReqBuffer mrb = { |
351 | .num_writes = 0, | |
bc6694d4 | 352 | }; |
6e02c38d AL |
353 | |
354 | while ((req = virtio_blk_get_request(s))) { | |
bc6694d4 | 355 | virtio_blk_handle_request(req, &mrb); |
6e02c38d | 356 | } |
91553dcc | 357 | |
c20fd872 | 358 | virtio_submit_multiwrite(s->bs, &mrb); |
91553dcc | 359 | |
6e02c38d AL |
360 | /* |
361 | * FIXME: Want to check for completions before returning to guest mode, | |
362 | * so cached reads and writes are reported as quickly as possible. But | |
363 | * that should be done in the generic block layer. | |
364 | */ | |
365 | } | |
366 | ||
213189ab | 367 | static void virtio_blk_dma_restart_bh(void *opaque) |
869a5c6d AL |
368 | { |
369 | VirtIOBlock *s = opaque; | |
370 | VirtIOBlockReq *req = s->rq; | |
f1b52868 KW |
371 | MultiReqBuffer mrb = { |
372 | .num_writes = 0, | |
f1b52868 | 373 | }; |
869a5c6d | 374 | |
213189ab MA |
375 | qemu_bh_delete(s->bh); |
376 | s->bh = NULL; | |
869a5c6d AL |
377 | |
378 | s->rq = NULL; | |
379 | ||
380 | while (req) { | |
f1b52868 | 381 | virtio_blk_handle_request(req, &mrb); |
869a5c6d AL |
382 | req = req->next; |
383 | } | |
f1b52868 | 384 | |
c20fd872 | 385 | virtio_submit_multiwrite(s->bs, &mrb); |
869a5c6d AL |
386 | } |
387 | ||
213189ab MA |
388 | static void virtio_blk_dma_restart_cb(void *opaque, int running, int reason) |
389 | { | |
390 | VirtIOBlock *s = opaque; | |
391 | ||
392 | if (!running) | |
393 | return; | |
394 | ||
395 | if (!s->bh) { | |
396 | s->bh = qemu_bh_new(virtio_blk_dma_restart_bh, s); | |
397 | qemu_bh_schedule(s->bh); | |
398 | } | |
399 | } | |
400 | ||
6e02c38d AL |
401 | static void virtio_blk_reset(VirtIODevice *vdev) |
402 | { | |
403 | /* | |
404 | * This should cancel pending requests, but can't do nicely until there | |
405 | * are per-device request lists. | |
406 | */ | |
407 | qemu_aio_flush(); | |
408 | } | |
409 | ||
bf011293 | 410 | /* coalesce internal state, copy to pci i/o region 0 |
411 | */ | |
6e02c38d AL |
412 | static void virtio_blk_update_config(VirtIODevice *vdev, uint8_t *config) |
413 | { | |
414 | VirtIOBlock *s = to_virtio_blk(vdev); | |
415 | struct virtio_blk_config blkcfg; | |
416 | uint64_t capacity; | |
417 | int cylinders, heads, secs; | |
418 | ||
419 | bdrv_get_geometry(s->bs, &capacity); | |
420 | bdrv_get_geometry_hint(s->bs, &cylinders, &heads, &secs); | |
5c5dafdc | 421 | memset(&blkcfg, 0, sizeof(blkcfg)); |
6e02c38d AL |
422 | stq_raw(&blkcfg.capacity, capacity); |
423 | stl_raw(&blkcfg.seg_max, 128 - 2); | |
424 | stw_raw(&blkcfg.cylinders, cylinders); | |
425 | blkcfg.heads = heads; | |
8cfacf07 CH |
426 | blkcfg.sectors = secs & ~s->sector_mask; |
427 | blkcfg.blk_size = s->conf->logical_block_size; | |
c7085da7 | 428 | blkcfg.size_max = 0; |
9752c371 CH |
429 | blkcfg.physical_block_exp = get_physical_block_exp(s->conf); |
430 | blkcfg.alignment_offset = 0; | |
8cfacf07 CH |
431 | blkcfg.min_io_size = s->conf->min_io_size / blkcfg.blk_size; |
432 | blkcfg.opt_io_size = s->conf->opt_io_size / blkcfg.blk_size; | |
37d5ddd6 | 433 | memcpy(config, &blkcfg, sizeof(struct virtio_blk_config)); |
6e02c38d AL |
434 | } |
435 | ||
8172539d | 436 | static uint32_t virtio_blk_get_features(VirtIODevice *vdev, uint32_t features) |
6e02c38d | 437 | { |
bf011293 | 438 | VirtIOBlock *s = to_virtio_blk(vdev); |
1063b8b1 CH |
439 | |
440 | features |= (1 << VIRTIO_BLK_F_SEG_MAX); | |
441 | features |= (1 << VIRTIO_BLK_F_GEOMETRY); | |
9752c371 | 442 | features |= (1 << VIRTIO_BLK_F_TOPOLOGY); |
8cfacf07 | 443 | features |= (1 << VIRTIO_BLK_F_BLK_SIZE); |
aa659be3 CH |
444 | |
445 | if (bdrv_enable_write_cache(s->bs)) | |
446 | features |= (1 << VIRTIO_BLK_F_WCACHE); | |
c79662f7 NS |
447 | |
448 | if (bdrv_is_read_only(s->bs)) | |
449 | features |= 1 << VIRTIO_BLK_F_RO; | |
1063b8b1 CH |
450 | |
451 | return features; | |
6e02c38d AL |
452 | } |
453 | ||
454 | static void virtio_blk_save(QEMUFile *f, void *opaque) | |
455 | { | |
456 | VirtIOBlock *s = opaque; | |
869a5c6d AL |
457 | VirtIOBlockReq *req = s->rq; |
458 | ||
6e02c38d | 459 | virtio_save(&s->vdev, f); |
869a5c6d AL |
460 | |
461 | while (req) { | |
462 | qemu_put_sbyte(f, 1); | |
463 | qemu_put_buffer(f, (unsigned char*)&req->elem, sizeof(req->elem)); | |
464 | req = req->next; | |
465 | } | |
466 | qemu_put_sbyte(f, 0); | |
6e02c38d AL |
467 | } |
468 | ||
469 | static int virtio_blk_load(QEMUFile *f, void *opaque, int version_id) | |
470 | { | |
471 | VirtIOBlock *s = opaque; | |
472 | ||
869a5c6d | 473 | if (version_id != 2) |
6e02c38d AL |
474 | return -EINVAL; |
475 | ||
476 | virtio_load(&s->vdev, f); | |
869a5c6d AL |
477 | while (qemu_get_sbyte(f)) { |
478 | VirtIOBlockReq *req = virtio_blk_alloc_request(s); | |
479 | qemu_get_buffer(f, (unsigned char*)&req->elem, sizeof(req->elem)); | |
480 | req->next = s->rq; | |
20a81e4d | 481 | s->rq = req; |
869a5c6d | 482 | } |
6e02c38d AL |
483 | |
484 | return 0; | |
485 | } | |
486 | ||
428c149b | 487 | VirtIODevice *virtio_blk_init(DeviceState *dev, BlockConf *conf) |
6e02c38d AL |
488 | { |
489 | VirtIOBlock *s; | |
490 | int cylinders, heads, secs; | |
491 | static int virtio_blk_id; | |
2930b313 | 492 | DriveInfo *dinfo; |
cf21e106 | 493 | |
d75d25e3 MA |
494 | if (!conf->bs) { |
495 | error_report("virtio-blk-pci: drive property not set"); | |
496 | return NULL; | |
497 | } | |
98f28ad7 MA |
498 | if (!bdrv_is_inserted(conf->bs)) { |
499 | error_report("Device needs media, but drive is empty"); | |
500 | return NULL; | |
501 | } | |
d75d25e3 | 502 | |
53c25cea | 503 | s = (VirtIOBlock *)virtio_common_init("virtio-blk", VIRTIO_ID_BLOCK, |
37d5ddd6 | 504 | sizeof(struct virtio_blk_config), |
53c25cea | 505 | sizeof(VirtIOBlock)); |
6e02c38d AL |
506 | |
507 | s->vdev.get_config = virtio_blk_update_config; | |
508 | s->vdev.get_features = virtio_blk_get_features; | |
509 | s->vdev.reset = virtio_blk_reset; | |
f8b6cc00 | 510 | s->bs = conf->bs; |
9752c371 | 511 | s->conf = conf; |
869a5c6d | 512 | s->rq = NULL; |
1573a35d | 513 | s->sector_mask = (s->conf->logical_block_size / BDRV_SECTOR_SIZE) - 1; |
6e02c38d | 514 | bdrv_guess_geometry(s->bs, &cylinders, &heads, &secs); |
6e02c38d | 515 | |
2930b313 | 516 | /* NB: per existing s/n string convention the string is terminated |
517 | * by '\0' only when less than sizeof (s->sn) | |
518 | */ | |
519 | dinfo = drive_get_by_blockdev(s->bs); | |
520 | strncpy(s->sn, dinfo->serial, sizeof (s->sn)); | |
521 | ||
6e02c38d AL |
522 | s->vq = virtio_add_queue(&s->vdev, 128, virtio_blk_handle_output); |
523 | ||
869a5c6d | 524 | qemu_add_vm_change_state_handler(virtio_blk_dma_restart_cb, s); |
0be71e32 | 525 | register_savevm(dev, "virtio-blk", virtio_blk_id++, 2, |
6e02c38d | 526 | virtio_blk_save, virtio_blk_load, s); |
7d0d6950 | 527 | bdrv_set_removable(s->bs, 0); |
6e02c38d | 528 | |
53c25cea | 529 | return &s->vdev; |
6e02c38d | 530 | } |