]>
Commit | Line | Data |
---|---|---|
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" |
2446333c | 16 | #include "blockdev.h" |
6e02c38d | 17 | #include "virtio-blk.h" |
1063b8b1 CH |
18 | #ifdef __linux__ |
19 | # include <scsi/sg.h> | |
20 | #endif | |
6e02c38d AL |
21 | |
22 | typedef struct VirtIOBlock | |
23 | { | |
24 | VirtIODevice vdev; | |
25 | BlockDriverState *bs; | |
26 | VirtQueue *vq; | |
869a5c6d | 27 | void *rq; |
213189ab | 28 | QEMUBH *bh; |
9752c371 | 29 | BlockConf *conf; |
8cfacf07 | 30 | unsigned short sector_mask; |
2930b313 | 31 | char sn[BLOCK_SERIAL_STRLEN]; |
9d0d3138 | 32 | DeviceState *qdev; |
6e02c38d AL |
33 | } VirtIOBlock; |
34 | ||
35 | static VirtIOBlock *to_virtio_blk(VirtIODevice *vdev) | |
36 | { | |
37 | return (VirtIOBlock *)vdev; | |
38 | } | |
39 | ||
40 | typedef struct VirtIOBlockReq | |
41 | { | |
42 | VirtIOBlock *dev; | |
43 | VirtQueueElement elem; | |
44 | struct virtio_blk_inhdr *in; | |
45 | struct virtio_blk_outhdr *out; | |
1063b8b1 | 46 | struct virtio_scsi_inhdr *scsi; |
d28a1b6e | 47 | QEMUIOVector qiov; |
869a5c6d | 48 | struct VirtIOBlockReq *next; |
6e02c38d AL |
49 | } VirtIOBlockReq; |
50 | ||
869a5c6d AL |
51 | static void virtio_blk_req_complete(VirtIOBlockReq *req, int status) |
52 | { | |
53 | VirtIOBlock *s = req->dev; | |
54 | ||
55 | req->in->status = status; | |
d28a1b6e | 56 | virtqueue_push(s->vq, &req->elem, req->qiov.size + sizeof(*req->in)); |
869a5c6d AL |
57 | virtio_notify(&s->vdev, s->vq); |
58 | ||
869a5c6d AL |
59 | qemu_free(req); |
60 | } | |
61 | ||
f35d68f0 KW |
62 | static int virtio_blk_handle_rw_error(VirtIOBlockReq *req, int error, |
63 | int is_read) | |
869a5c6d | 64 | { |
abd7f68d | 65 | BlockErrorAction action = bdrv_get_on_error(req->dev->bs, is_read); |
869a5c6d AL |
66 | VirtIOBlock *s = req->dev; |
67 | ||
eaa6c85f | 68 | if (action == BLOCK_ERR_IGNORE) { |
908bb949 | 69 | bdrv_mon_event(s->bs, BDRV_ACTION_IGNORE, is_read); |
869a5c6d | 70 | return 0; |
eaa6c85f | 71 | } |
869a5c6d AL |
72 | |
73 | if ((error == ENOSPC && action == BLOCK_ERR_STOP_ENOSPC) | |
74 | || action == BLOCK_ERR_STOP_ANY) { | |
75 | req->next = s->rq; | |
76 | s->rq = req; | |
908bb949 | 77 | bdrv_mon_event(s->bs, BDRV_ACTION_STOP, is_read); |
554a310b | 78 | vm_stop(0); |
869a5c6d AL |
79 | } else { |
80 | virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR); | |
908bb949 | 81 | bdrv_mon_event(s->bs, BDRV_ACTION_REPORT, is_read); |
869a5c6d AL |
82 | } |
83 | ||
84 | return 1; | |
85 | } | |
86 | ||
6e02c38d AL |
87 | static void virtio_blk_rw_complete(void *opaque, int ret) |
88 | { | |
89 | VirtIOBlockReq *req = opaque; | |
6e02c38d | 90 | |
f35d68f0 KW |
91 | if (ret) { |
92 | int is_read = !(req->out->type & VIRTIO_BLK_T_OUT); | |
93 | if (virtio_blk_handle_rw_error(req, -ret, is_read)) | |
869a5c6d | 94 | return; |
6e02c38d AL |
95 | } |
96 | ||
f35d68f0 | 97 | virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); |
869a5c6d | 98 | } |
6e02c38d | 99 | |
aa659be3 CH |
100 | static void virtio_blk_flush_complete(void *opaque, int ret) |
101 | { | |
102 | VirtIOBlockReq *req = opaque; | |
103 | ||
104 | virtio_blk_req_complete(req, ret ? VIRTIO_BLK_S_IOERR : VIRTIO_BLK_S_OK); | |
105 | } | |
106 | ||
869a5c6d AL |
107 | static VirtIOBlockReq *virtio_blk_alloc_request(VirtIOBlock *s) |
108 | { | |
de6c8042 | 109 | VirtIOBlockReq *req = qemu_malloc(sizeof(*req)); |
487414f1 | 110 | req->dev = s; |
de6c8042 SH |
111 | req->qiov.size = 0; |
112 | req->next = NULL; | |
869a5c6d | 113 | return req; |
6e02c38d AL |
114 | } |
115 | ||
116 | static VirtIOBlockReq *virtio_blk_get_request(VirtIOBlock *s) | |
117 | { | |
869a5c6d | 118 | VirtIOBlockReq *req = virtio_blk_alloc_request(s); |
6e02c38d | 119 | |
869a5c6d AL |
120 | if (req != NULL) { |
121 | if (!virtqueue_pop(s->vq, &req->elem)) { | |
122 | qemu_free(req); | |
123 | return NULL; | |
124 | } | |
6e02c38d AL |
125 | } |
126 | ||
127 | return req; | |
128 | } | |
129 | ||
1063b8b1 CH |
130 | #ifdef __linux__ |
131 | static void virtio_blk_handle_scsi(VirtIOBlockReq *req) | |
132 | { | |
133 | struct sg_io_hdr hdr; | |
4277906d | 134 | int ret; |
1063b8b1 CH |
135 | int status; |
136 | int i; | |
137 | ||
138 | /* | |
139 | * We require at least one output segment each for the virtio_blk_outhdr | |
140 | * and the SCSI command block. | |
141 | * | |
142 | * We also at least require the virtio_blk_inhdr, the virtio_scsi_inhdr | |
143 | * and the sense buffer pointer in the input segments. | |
144 | */ | |
145 | if (req->elem.out_num < 2 || req->elem.in_num < 3) { | |
146 | virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR); | |
147 | return; | |
148 | } | |
149 | ||
150 | /* | |
151 | * No support for bidirection commands yet. | |
152 | */ | |
153 | if (req->elem.out_num > 2 && req->elem.in_num > 3) { | |
154 | virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP); | |
155 | return; | |
156 | } | |
157 | ||
158 | /* | |
159 | * The scsi inhdr is placed in the second-to-last input segment, just | |
160 | * before the regular inhdr. | |
161 | */ | |
162 | req->scsi = (void *)req->elem.in_sg[req->elem.in_num - 2].iov_base; | |
1063b8b1 CH |
163 | |
164 | memset(&hdr, 0, sizeof(struct sg_io_hdr)); | |
165 | hdr.interface_id = 'S'; | |
166 | hdr.cmd_len = req->elem.out_sg[1].iov_len; | |
167 | hdr.cmdp = req->elem.out_sg[1].iov_base; | |
168 | hdr.dxfer_len = 0; | |
169 | ||
170 | if (req->elem.out_num > 2) { | |
171 | /* | |
172 | * If there are more than the minimally required 2 output segments | |
173 | * there is write payload starting from the third iovec. | |
174 | */ | |
175 | hdr.dxfer_direction = SG_DXFER_TO_DEV; | |
176 | hdr.iovec_count = req->elem.out_num - 2; | |
177 | ||
178 | for (i = 0; i < hdr.iovec_count; i++) | |
179 | hdr.dxfer_len += req->elem.out_sg[i + 2].iov_len; | |
180 | ||
181 | hdr.dxferp = req->elem.out_sg + 2; | |
182 | ||
183 | } else if (req->elem.in_num > 3) { | |
184 | /* | |
185 | * If we have more than 3 input segments the guest wants to actually | |
186 | * read data. | |
187 | */ | |
188 | hdr.dxfer_direction = SG_DXFER_FROM_DEV; | |
189 | hdr.iovec_count = req->elem.in_num - 3; | |
190 | for (i = 0; i < hdr.iovec_count; i++) | |
191 | hdr.dxfer_len += req->elem.in_sg[i].iov_len; | |
192 | ||
193 | hdr.dxferp = req->elem.in_sg; | |
1063b8b1 CH |
194 | } else { |
195 | /* | |
196 | * Some SCSI commands don't actually transfer any data. | |
197 | */ | |
198 | hdr.dxfer_direction = SG_DXFER_NONE; | |
199 | } | |
200 | ||
201 | hdr.sbp = req->elem.in_sg[req->elem.in_num - 3].iov_base; | |
202 | hdr.mx_sb_len = req->elem.in_sg[req->elem.in_num - 3].iov_len; | |
1063b8b1 CH |
203 | |
204 | ret = bdrv_ioctl(req->dev->bs, SG_IO, &hdr); | |
205 | if (ret) { | |
206 | status = VIRTIO_BLK_S_UNSUPP; | |
207 | hdr.status = ret; | |
208 | hdr.resid = hdr.dxfer_len; | |
209 | } else if (hdr.status) { | |
210 | status = VIRTIO_BLK_S_IOERR; | |
211 | } else { | |
212 | status = VIRTIO_BLK_S_OK; | |
213 | } | |
214 | ||
215 | req->scsi->errors = hdr.status; | |
216 | req->scsi->residual = hdr.resid; | |
217 | req->scsi->sense_len = hdr.sb_len_wr; | |
218 | req->scsi->data_len = hdr.dxfer_len; | |
219 | ||
220 | virtio_blk_req_complete(req, status); | |
221 | } | |
222 | #else | |
223 | static void virtio_blk_handle_scsi(VirtIOBlockReq *req) | |
224 | { | |
225 | virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP); | |
226 | } | |
227 | #endif /* __linux__ */ | |
228 | ||
c20fd872 CH |
229 | typedef struct MultiReqBuffer { |
230 | BlockRequest blkreq[32]; | |
231 | unsigned int num_writes; | |
232 | } MultiReqBuffer; | |
233 | ||
234 | static void virtio_submit_multiwrite(BlockDriverState *bs, MultiReqBuffer *mrb) | |
869a5c6d | 235 | { |
91553dcc | 236 | int i, ret; |
91553dcc | 237 | |
c20fd872 CH |
238 | if (!mrb->num_writes) { |
239 | return; | |
240 | } | |
241 | ||
242 | ret = bdrv_aio_multiwrite(bs, mrb->blkreq, mrb->num_writes); | |
91553dcc | 243 | if (ret != 0) { |
c20fd872 CH |
244 | for (i = 0; i < mrb->num_writes; i++) { |
245 | if (mrb->blkreq[i].error) { | |
246 | virtio_blk_rw_complete(mrb->blkreq[i].opaque, -EIO); | |
91553dcc KW |
247 | } |
248 | } | |
249 | } | |
c20fd872 CH |
250 | |
251 | mrb->num_writes = 0; | |
91553dcc | 252 | } |
87b245db | 253 | |
c20fd872 | 254 | static void virtio_blk_handle_flush(VirtIOBlockReq *req, MultiReqBuffer *mrb) |
aa659be3 CH |
255 | { |
256 | BlockDriverAIOCB *acb; | |
257 | ||
618fbb84 CH |
258 | /* |
259 | * Make sure all outstanding writes are posted to the backing device. | |
260 | */ | |
c20fd872 | 261 | virtio_submit_multiwrite(req->dev->bs, mrb); |
618fbb84 | 262 | |
aa659be3 CH |
263 | acb = bdrv_aio_flush(req->dev->bs, virtio_blk_flush_complete, req); |
264 | if (!acb) { | |
265 | virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR); | |
266 | } | |
267 | } | |
268 | ||
c20fd872 | 269 | static void virtio_blk_handle_write(VirtIOBlockReq *req, MultiReqBuffer *mrb) |
91553dcc | 270 | { |
c20fd872 CH |
271 | BlockRequest *blkreq; |
272 | ||
8cfacf07 CH |
273 | if (req->out->sector & req->dev->sector_mask) { |
274 | virtio_blk_rw_complete(req, -EIO); | |
275 | return; | |
276 | } | |
277 | ||
c20fd872 CH |
278 | if (mrb->num_writes == 32) { |
279 | virtio_submit_multiwrite(req->dev->bs, mrb); | |
87b245db | 280 | } |
91553dcc | 281 | |
c20fd872 CH |
282 | blkreq = &mrb->blkreq[mrb->num_writes]; |
283 | blkreq->sector = req->out->sector; | |
284 | blkreq->nb_sectors = req->qiov.size / BDRV_SECTOR_SIZE; | |
285 | blkreq->qiov = &req->qiov; | |
286 | blkreq->cb = virtio_blk_rw_complete; | |
287 | blkreq->opaque = req; | |
288 | blkreq->error = 0; | |
91553dcc | 289 | |
c20fd872 | 290 | mrb->num_writes++; |
d28a1b6e | 291 | } |
869a5c6d | 292 | |
d28a1b6e AL |
293 | static void virtio_blk_handle_read(VirtIOBlockReq *req) |
294 | { | |
87b245db CH |
295 | BlockDriverAIOCB *acb; |
296 | ||
8cfacf07 CH |
297 | if (req->out->sector & req->dev->sector_mask) { |
298 | virtio_blk_rw_complete(req, -EIO); | |
299 | return; | |
300 | } | |
301 | ||
87b245db | 302 | acb = bdrv_aio_readv(req->dev->bs, req->out->sector, &req->qiov, |
1573a35d JS |
303 | req->qiov.size / BDRV_SECTOR_SIZE, |
304 | virtio_blk_rw_complete, req); | |
87b245db | 305 | if (!acb) { |
6c510fbf | 306 | virtio_blk_rw_complete(req, -EIO); |
87b245db | 307 | } |
869a5c6d AL |
308 | } |
309 | ||
bc6694d4 KW |
310 | static void virtio_blk_handle_request(VirtIOBlockReq *req, |
311 | MultiReqBuffer *mrb) | |
312 | { | |
313 | if (req->elem.out_num < 1 || req->elem.in_num < 1) { | |
314 | fprintf(stderr, "virtio-blk missing headers\n"); | |
315 | exit(1); | |
316 | } | |
317 | ||
318 | if (req->elem.out_sg[0].iov_len < sizeof(*req->out) || | |
319 | req->elem.in_sg[req->elem.in_num - 1].iov_len < sizeof(*req->in)) { | |
320 | fprintf(stderr, "virtio-blk header not in correct element\n"); | |
321 | exit(1); | |
322 | } | |
323 | ||
324 | req->out = (void *)req->elem.out_sg[0].iov_base; | |
325 | req->in = (void *)req->elem.in_sg[req->elem.in_num - 1].iov_base; | |
326 | ||
327 | if (req->out->type & VIRTIO_BLK_T_FLUSH) { | |
c20fd872 | 328 | virtio_blk_handle_flush(req, mrb); |
bc6694d4 KW |
329 | } else if (req->out->type & VIRTIO_BLK_T_SCSI_CMD) { |
330 | virtio_blk_handle_scsi(req); | |
2930b313 | 331 | } else if (req->out->type & VIRTIO_BLK_T_GET_ID) { |
332 | VirtIOBlock *s = req->dev; | |
333 | ||
334 | memcpy(req->elem.in_sg[0].iov_base, s->sn, | |
335 | MIN(req->elem.in_sg[0].iov_len, sizeof(s->sn))); | |
336 | virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); | |
bc6694d4 KW |
337 | } else if (req->out->type & VIRTIO_BLK_T_OUT) { |
338 | qemu_iovec_init_external(&req->qiov, &req->elem.out_sg[1], | |
339 | req->elem.out_num - 1); | |
c20fd872 | 340 | virtio_blk_handle_write(req, mrb); |
bc6694d4 KW |
341 | } else { |
342 | qemu_iovec_init_external(&req->qiov, &req->elem.in_sg[0], | |
343 | req->elem.in_num - 1); | |
344 | virtio_blk_handle_read(req); | |
345 | } | |
346 | } | |
347 | ||
6e02c38d AL |
348 | static void virtio_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq) |
349 | { | |
350 | VirtIOBlock *s = to_virtio_blk(vdev); | |
351 | VirtIOBlockReq *req; | |
bc6694d4 KW |
352 | MultiReqBuffer mrb = { |
353 | .num_writes = 0, | |
bc6694d4 | 354 | }; |
6e02c38d AL |
355 | |
356 | while ((req = virtio_blk_get_request(s))) { | |
bc6694d4 | 357 | virtio_blk_handle_request(req, &mrb); |
6e02c38d | 358 | } |
91553dcc | 359 | |
c20fd872 | 360 | virtio_submit_multiwrite(s->bs, &mrb); |
91553dcc | 361 | |
6e02c38d AL |
362 | /* |
363 | * FIXME: Want to check for completions before returning to guest mode, | |
364 | * so cached reads and writes are reported as quickly as possible. But | |
365 | * that should be done in the generic block layer. | |
366 | */ | |
367 | } | |
368 | ||
213189ab | 369 | static void virtio_blk_dma_restart_bh(void *opaque) |
869a5c6d AL |
370 | { |
371 | VirtIOBlock *s = opaque; | |
372 | VirtIOBlockReq *req = s->rq; | |
f1b52868 KW |
373 | MultiReqBuffer mrb = { |
374 | .num_writes = 0, | |
f1b52868 | 375 | }; |
869a5c6d | 376 | |
213189ab MA |
377 | qemu_bh_delete(s->bh); |
378 | s->bh = NULL; | |
869a5c6d AL |
379 | |
380 | s->rq = NULL; | |
381 | ||
382 | while (req) { | |
f1b52868 | 383 | virtio_blk_handle_request(req, &mrb); |
869a5c6d AL |
384 | req = req->next; |
385 | } | |
f1b52868 | 386 | |
c20fd872 | 387 | virtio_submit_multiwrite(s->bs, &mrb); |
869a5c6d AL |
388 | } |
389 | ||
213189ab MA |
390 | static void virtio_blk_dma_restart_cb(void *opaque, int running, int reason) |
391 | { | |
392 | VirtIOBlock *s = opaque; | |
393 | ||
394 | if (!running) | |
395 | return; | |
396 | ||
397 | if (!s->bh) { | |
398 | s->bh = qemu_bh_new(virtio_blk_dma_restart_bh, s); | |
399 | qemu_bh_schedule(s->bh); | |
400 | } | |
401 | } | |
402 | ||
6e02c38d AL |
403 | static void virtio_blk_reset(VirtIODevice *vdev) |
404 | { | |
405 | /* | |
406 | * This should cancel pending requests, but can't do nicely until there | |
407 | * are per-device request lists. | |
408 | */ | |
409 | qemu_aio_flush(); | |
410 | } | |
411 | ||
bf011293 | 412 | /* coalesce internal state, copy to pci i/o region 0 |
413 | */ | |
6e02c38d AL |
414 | static void virtio_blk_update_config(VirtIODevice *vdev, uint8_t *config) |
415 | { | |
416 | VirtIOBlock *s = to_virtio_blk(vdev); | |
417 | struct virtio_blk_config blkcfg; | |
418 | uint64_t capacity; | |
419 | int cylinders, heads, secs; | |
420 | ||
421 | bdrv_get_geometry(s->bs, &capacity); | |
422 | bdrv_get_geometry_hint(s->bs, &cylinders, &heads, &secs); | |
5c5dafdc | 423 | memset(&blkcfg, 0, sizeof(blkcfg)); |
6e02c38d AL |
424 | stq_raw(&blkcfg.capacity, capacity); |
425 | stl_raw(&blkcfg.seg_max, 128 - 2); | |
426 | stw_raw(&blkcfg.cylinders, cylinders); | |
427 | blkcfg.heads = heads; | |
8cfacf07 CH |
428 | blkcfg.sectors = secs & ~s->sector_mask; |
429 | blkcfg.blk_size = s->conf->logical_block_size; | |
c7085da7 | 430 | blkcfg.size_max = 0; |
9752c371 CH |
431 | blkcfg.physical_block_exp = get_physical_block_exp(s->conf); |
432 | blkcfg.alignment_offset = 0; | |
8cfacf07 CH |
433 | blkcfg.min_io_size = s->conf->min_io_size / blkcfg.blk_size; |
434 | blkcfg.opt_io_size = s->conf->opt_io_size / blkcfg.blk_size; | |
37d5ddd6 | 435 | memcpy(config, &blkcfg, sizeof(struct virtio_blk_config)); |
6e02c38d AL |
436 | } |
437 | ||
8172539d | 438 | static uint32_t virtio_blk_get_features(VirtIODevice *vdev, uint32_t features) |
6e02c38d | 439 | { |
bf011293 | 440 | VirtIOBlock *s = to_virtio_blk(vdev); |
1063b8b1 CH |
441 | |
442 | features |= (1 << VIRTIO_BLK_F_SEG_MAX); | |
443 | features |= (1 << VIRTIO_BLK_F_GEOMETRY); | |
9752c371 | 444 | features |= (1 << VIRTIO_BLK_F_TOPOLOGY); |
8cfacf07 | 445 | features |= (1 << VIRTIO_BLK_F_BLK_SIZE); |
aa659be3 CH |
446 | |
447 | if (bdrv_enable_write_cache(s->bs)) | |
448 | features |= (1 << VIRTIO_BLK_F_WCACHE); | |
c79662f7 NS |
449 | |
450 | if (bdrv_is_read_only(s->bs)) | |
451 | features |= 1 << VIRTIO_BLK_F_RO; | |
1063b8b1 CH |
452 | |
453 | return features; | |
6e02c38d AL |
454 | } |
455 | ||
456 | static void virtio_blk_save(QEMUFile *f, void *opaque) | |
457 | { | |
458 | VirtIOBlock *s = opaque; | |
869a5c6d AL |
459 | VirtIOBlockReq *req = s->rq; |
460 | ||
6e02c38d | 461 | virtio_save(&s->vdev, f); |
869a5c6d AL |
462 | |
463 | while (req) { | |
464 | qemu_put_sbyte(f, 1); | |
465 | qemu_put_buffer(f, (unsigned char*)&req->elem, sizeof(req->elem)); | |
466 | req = req->next; | |
467 | } | |
468 | qemu_put_sbyte(f, 0); | |
6e02c38d AL |
469 | } |
470 | ||
471 | static int virtio_blk_load(QEMUFile *f, void *opaque, int version_id) | |
472 | { | |
473 | VirtIOBlock *s = opaque; | |
474 | ||
869a5c6d | 475 | if (version_id != 2) |
6e02c38d AL |
476 | return -EINVAL; |
477 | ||
478 | virtio_load(&s->vdev, f); | |
869a5c6d AL |
479 | while (qemu_get_sbyte(f)) { |
480 | VirtIOBlockReq *req = virtio_blk_alloc_request(s); | |
481 | qemu_get_buffer(f, (unsigned char*)&req->elem, sizeof(req->elem)); | |
482 | req->next = s->rq; | |
20a81e4d | 483 | s->rq = req; |
869a5c6d | 484 | } |
6e02c38d AL |
485 | |
486 | return 0; | |
487 | } | |
488 | ||
428c149b | 489 | VirtIODevice *virtio_blk_init(DeviceState *dev, BlockConf *conf) |
6e02c38d AL |
490 | { |
491 | VirtIOBlock *s; | |
492 | int cylinders, heads, secs; | |
493 | static int virtio_blk_id; | |
2930b313 | 494 | DriveInfo *dinfo; |
cf21e106 | 495 | |
d75d25e3 MA |
496 | if (!conf->bs) { |
497 | error_report("virtio-blk-pci: drive property not set"); | |
498 | return NULL; | |
499 | } | |
98f28ad7 MA |
500 | if (!bdrv_is_inserted(conf->bs)) { |
501 | error_report("Device needs media, but drive is empty"); | |
502 | return NULL; | |
503 | } | |
d75d25e3 | 504 | |
53c25cea | 505 | s = (VirtIOBlock *)virtio_common_init("virtio-blk", VIRTIO_ID_BLOCK, |
37d5ddd6 | 506 | sizeof(struct virtio_blk_config), |
53c25cea | 507 | sizeof(VirtIOBlock)); |
6e02c38d AL |
508 | |
509 | s->vdev.get_config = virtio_blk_update_config; | |
510 | s->vdev.get_features = virtio_blk_get_features; | |
511 | s->vdev.reset = virtio_blk_reset; | |
f8b6cc00 | 512 | s->bs = conf->bs; |
9752c371 | 513 | s->conf = conf; |
869a5c6d | 514 | s->rq = NULL; |
1573a35d | 515 | s->sector_mask = (s->conf->logical_block_size / BDRV_SECTOR_SIZE) - 1; |
6e02c38d | 516 | bdrv_guess_geometry(s->bs, &cylinders, &heads, &secs); |
6e02c38d | 517 | |
2930b313 | 518 | /* NB: per existing s/n string convention the string is terminated |
519 | * by '\0' only when less than sizeof (s->sn) | |
520 | */ | |
521 | dinfo = drive_get_by_blockdev(s->bs); | |
522 | strncpy(s->sn, dinfo->serial, sizeof (s->sn)); | |
523 | ||
6e02c38d AL |
524 | s->vq = virtio_add_queue(&s->vdev, 128, virtio_blk_handle_output); |
525 | ||
869a5c6d | 526 | qemu_add_vm_change_state_handler(virtio_blk_dma_restart_cb, s); |
9d0d3138 | 527 | s->qdev = dev; |
0be71e32 | 528 | register_savevm(dev, "virtio-blk", virtio_blk_id++, 2, |
6e02c38d | 529 | virtio_blk_save, virtio_blk_load, s); |
7d0d6950 | 530 | bdrv_set_removable(s->bs, 0); |
6e02c38d | 531 | |
53c25cea | 532 | return &s->vdev; |
6e02c38d | 533 | } |
9d0d3138 AW |
534 | |
535 | void virtio_blk_exit(VirtIODevice *vdev) | |
536 | { | |
537 | VirtIOBlock *s = to_virtio_blk(vdev); | |
538 | unregister_savevm(s->qdev, "virtio-blk", s); | |
539 | } |