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