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