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