]>
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 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 | { | |
108 | VirtIOBlockReq *req = qemu_mallocz(sizeof(*req)); | |
487414f1 | 109 | req->dev = s; |
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 | ||
91553dcc KW |
226 | static void do_multiwrite(BlockDriverState *bs, BlockRequest *blkreq, |
227 | int num_writes) | |
869a5c6d | 228 | { |
91553dcc KW |
229 | int i, ret; |
230 | ret = bdrv_aio_multiwrite(bs, blkreq, num_writes); | |
231 | ||
232 | if (ret != 0) { | |
233 | for (i = 0; i < num_writes; i++) { | |
234 | if (blkreq[i].error) { | |
6c510fbf | 235 | virtio_blk_rw_complete(blkreq[i].opaque, -EIO); |
91553dcc KW |
236 | } |
237 | } | |
238 | } | |
239 | } | |
87b245db | 240 | |
aa659be3 CH |
241 | static void virtio_blk_handle_flush(VirtIOBlockReq *req) |
242 | { | |
243 | BlockDriverAIOCB *acb; | |
244 | ||
245 | acb = bdrv_aio_flush(req->dev->bs, virtio_blk_flush_complete, req); | |
246 | if (!acb) { | |
247 | virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR); | |
248 | } | |
249 | } | |
250 | ||
91553dcc KW |
251 | static void virtio_blk_handle_write(BlockRequest *blkreq, int *num_writes, |
252 | VirtIOBlockReq *req, BlockDriverState **old_bs) | |
253 | { | |
8cfacf07 CH |
254 | if (req->out->sector & req->dev->sector_mask) { |
255 | virtio_blk_rw_complete(req, -EIO); | |
256 | return; | |
257 | } | |
258 | ||
91553dcc KW |
259 | if (req->dev->bs != *old_bs || *num_writes == 32) { |
260 | if (*old_bs != NULL) { | |
261 | do_multiwrite(*old_bs, blkreq, *num_writes); | |
262 | } | |
263 | *num_writes = 0; | |
264 | *old_bs = req->dev->bs; | |
87b245db | 265 | } |
91553dcc KW |
266 | |
267 | blkreq[*num_writes].sector = req->out->sector; | |
268 | blkreq[*num_writes].nb_sectors = req->qiov.size / 512; | |
269 | blkreq[*num_writes].qiov = &req->qiov; | |
270 | blkreq[*num_writes].cb = virtio_blk_rw_complete; | |
271 | blkreq[*num_writes].opaque = req; | |
272 | blkreq[*num_writes].error = 0; | |
273 | ||
274 | (*num_writes)++; | |
d28a1b6e | 275 | } |
869a5c6d | 276 | |
d28a1b6e AL |
277 | static void virtio_blk_handle_read(VirtIOBlockReq *req) |
278 | { | |
87b245db CH |
279 | BlockDriverAIOCB *acb; |
280 | ||
8cfacf07 CH |
281 | if (req->out->sector & req->dev->sector_mask) { |
282 | virtio_blk_rw_complete(req, -EIO); | |
283 | return; | |
284 | } | |
285 | ||
87b245db CH |
286 | acb = bdrv_aio_readv(req->dev->bs, req->out->sector, &req->qiov, |
287 | req->qiov.size / 512, virtio_blk_rw_complete, req); | |
288 | if (!acb) { | |
6c510fbf | 289 | virtio_blk_rw_complete(req, -EIO); |
87b245db | 290 | } |
869a5c6d AL |
291 | } |
292 | ||
bc6694d4 KW |
293 | typedef struct MultiReqBuffer { |
294 | BlockRequest blkreq[32]; | |
295 | int num_writes; | |
296 | BlockDriverState *old_bs; | |
297 | } MultiReqBuffer; | |
298 | ||
299 | static void virtio_blk_handle_request(VirtIOBlockReq *req, | |
300 | MultiReqBuffer *mrb) | |
301 | { | |
302 | if (req->elem.out_num < 1 || req->elem.in_num < 1) { | |
303 | fprintf(stderr, "virtio-blk missing headers\n"); | |
304 | exit(1); | |
305 | } | |
306 | ||
307 | if (req->elem.out_sg[0].iov_len < sizeof(*req->out) || | |
308 | req->elem.in_sg[req->elem.in_num - 1].iov_len < sizeof(*req->in)) { | |
309 | fprintf(stderr, "virtio-blk header not in correct element\n"); | |
310 | exit(1); | |
311 | } | |
312 | ||
313 | req->out = (void *)req->elem.out_sg[0].iov_base; | |
314 | req->in = (void *)req->elem.in_sg[req->elem.in_num - 1].iov_base; | |
315 | ||
316 | if (req->out->type & VIRTIO_BLK_T_FLUSH) { | |
317 | virtio_blk_handle_flush(req); | |
318 | } else if (req->out->type & VIRTIO_BLK_T_SCSI_CMD) { | |
319 | virtio_blk_handle_scsi(req); | |
320 | } else if (req->out->type & VIRTIO_BLK_T_OUT) { | |
321 | qemu_iovec_init_external(&req->qiov, &req->elem.out_sg[1], | |
322 | req->elem.out_num - 1); | |
323 | virtio_blk_handle_write(mrb->blkreq, &mrb->num_writes, | |
324 | req, &mrb->old_bs); | |
325 | } else { | |
326 | qemu_iovec_init_external(&req->qiov, &req->elem.in_sg[0], | |
327 | req->elem.in_num - 1); | |
328 | virtio_blk_handle_read(req); | |
329 | } | |
330 | } | |
331 | ||
6e02c38d AL |
332 | static void virtio_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq) |
333 | { | |
334 | VirtIOBlock *s = to_virtio_blk(vdev); | |
335 | VirtIOBlockReq *req; | |
bc6694d4 KW |
336 | MultiReqBuffer mrb = { |
337 | .num_writes = 0, | |
338 | .old_bs = NULL, | |
339 | }; | |
6e02c38d AL |
340 | |
341 | while ((req = virtio_blk_get_request(s))) { | |
bc6694d4 | 342 | virtio_blk_handle_request(req, &mrb); |
6e02c38d | 343 | } |
91553dcc | 344 | |
bc6694d4 KW |
345 | if (mrb.num_writes > 0) { |
346 | do_multiwrite(mrb.old_bs, mrb.blkreq, mrb.num_writes); | |
91553dcc KW |
347 | } |
348 | ||
6e02c38d AL |
349 | /* |
350 | * FIXME: Want to check for completions before returning to guest mode, | |
351 | * so cached reads and writes are reported as quickly as possible. But | |
352 | * that should be done in the generic block layer. | |
353 | */ | |
354 | } | |
355 | ||
213189ab | 356 | static void virtio_blk_dma_restart_bh(void *opaque) |
869a5c6d AL |
357 | { |
358 | VirtIOBlock *s = opaque; | |
359 | VirtIOBlockReq *req = s->rq; | |
f1b52868 KW |
360 | MultiReqBuffer mrb = { |
361 | .num_writes = 0, | |
362 | .old_bs = NULL, | |
363 | }; | |
869a5c6d | 364 | |
213189ab MA |
365 | qemu_bh_delete(s->bh); |
366 | s->bh = NULL; | |
869a5c6d AL |
367 | |
368 | s->rq = NULL; | |
369 | ||
370 | while (req) { | |
f1b52868 | 371 | virtio_blk_handle_request(req, &mrb); |
869a5c6d AL |
372 | req = req->next; |
373 | } | |
f1b52868 KW |
374 | |
375 | if (mrb.num_writes > 0) { | |
376 | do_multiwrite(mrb.old_bs, mrb.blkreq, mrb.num_writes); | |
377 | } | |
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; | |
473 | s->rq = req->next; | |
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; |
8cfacf07 | 495 | s->sector_mask = (s->conf->logical_block_size / 512) - 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 | } |