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