root / hw / virtio-blk.c @ be62a2eb
History | View | Annotate | Download (16.8 kB)
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 |
#include "scsi-defs.h" |
20 |
#ifdef __linux__
|
21 |
# include <scsi/sg.h> |
22 |
#endif
|
23 |
|
24 |
typedef struct VirtIOBlock |
25 |
{ |
26 |
VirtIODevice vdev; |
27 |
BlockDriverState *bs; |
28 |
VirtQueue *vq; |
29 |
void *rq;
|
30 |
QEMUBH *bh; |
31 |
BlockConf *conf; |
32 |
char *serial;
|
33 |
unsigned short sector_mask; |
34 |
DeviceState *qdev; |
35 |
} VirtIOBlock; |
36 |
|
37 |
static VirtIOBlock *to_virtio_blk(VirtIODevice *vdev)
|
38 |
{ |
39 |
return (VirtIOBlock *)vdev;
|
40 |
} |
41 |
|
42 |
typedef struct VirtIOBlockReq |
43 |
{ |
44 |
VirtIOBlock *dev; |
45 |
VirtQueueElement elem; |
46 |
struct virtio_blk_inhdr *in;
|
47 |
struct virtio_blk_outhdr *out;
|
48 |
struct virtio_scsi_inhdr *scsi;
|
49 |
QEMUIOVector qiov; |
50 |
struct VirtIOBlockReq *next;
|
51 |
BlockAcctCookie acct; |
52 |
} VirtIOBlockReq; |
53 |
|
54 |
static void virtio_blk_req_complete(VirtIOBlockReq *req, int status) |
55 |
{ |
56 |
VirtIOBlock *s = req->dev; |
57 |
|
58 |
trace_virtio_blk_req_complete(req, status); |
59 |
|
60 |
stb_p(&req->in->status, status); |
61 |
virtqueue_push(s->vq, &req->elem, req->qiov.size + sizeof(*req->in));
|
62 |
virtio_notify(&s->vdev, s->vq); |
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(RUN_STATE_IO_ERROR); |
82 |
bdrv_iostatus_set_err(s->bs, error); |
83 |
} else {
|
84 |
virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR); |
85 |
bdrv_acct_done(s->bs, &req->acct); |
86 |
g_free(req); |
87 |
bdrv_mon_event(s->bs, BDRV_ACTION_REPORT, is_read); |
88 |
} |
89 |
|
90 |
return 1; |
91 |
} |
92 |
|
93 |
static void virtio_blk_rw_complete(void *opaque, int ret) |
94 |
{ |
95 |
VirtIOBlockReq *req = opaque; |
96 |
|
97 |
trace_virtio_blk_rw_complete(req, ret); |
98 |
|
99 |
if (ret) {
|
100 |
int is_read = !(ldl_p(&req->out->type) & VIRTIO_BLK_T_OUT);
|
101 |
if (virtio_blk_handle_rw_error(req, -ret, is_read))
|
102 |
return;
|
103 |
} |
104 |
|
105 |
virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); |
106 |
bdrv_acct_done(req->dev->bs, &req->acct); |
107 |
g_free(req); |
108 |
} |
109 |
|
110 |
static void virtio_blk_flush_complete(void *opaque, int ret) |
111 |
{ |
112 |
VirtIOBlockReq *req = opaque; |
113 |
|
114 |
if (ret) {
|
115 |
if (virtio_blk_handle_rw_error(req, -ret, 0)) { |
116 |
return;
|
117 |
} |
118 |
} |
119 |
|
120 |
virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); |
121 |
bdrv_acct_done(req->dev->bs, &req->acct); |
122 |
g_free(req); |
123 |
} |
124 |
|
125 |
static VirtIOBlockReq *virtio_blk_alloc_request(VirtIOBlock *s)
|
126 |
{ |
127 |
VirtIOBlockReq *req = g_malloc(sizeof(*req));
|
128 |
req->dev = s; |
129 |
req->qiov.size = 0;
|
130 |
req->next = NULL;
|
131 |
return req;
|
132 |
} |
133 |
|
134 |
static VirtIOBlockReq *virtio_blk_get_request(VirtIOBlock *s)
|
135 |
{ |
136 |
VirtIOBlockReq *req = virtio_blk_alloc_request(s); |
137 |
|
138 |
if (req != NULL) { |
139 |
if (!virtqueue_pop(s->vq, &req->elem)) {
|
140 |
g_free(req); |
141 |
return NULL; |
142 |
} |
143 |
} |
144 |
|
145 |
return req;
|
146 |
} |
147 |
|
148 |
#ifdef __linux__
|
149 |
static void virtio_blk_handle_scsi(VirtIOBlockReq *req) |
150 |
{ |
151 |
struct sg_io_hdr hdr;
|
152 |
int ret;
|
153 |
int status;
|
154 |
int i;
|
155 |
|
156 |
/*
|
157 |
* We require at least one output segment each for the virtio_blk_outhdr
|
158 |
* and the SCSI command block.
|
159 |
*
|
160 |
* We also at least require the virtio_blk_inhdr, the virtio_scsi_inhdr
|
161 |
* and the sense buffer pointer in the input segments.
|
162 |
*/
|
163 |
if (req->elem.out_num < 2 || req->elem.in_num < 3) { |
164 |
virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR); |
165 |
g_free(req); |
166 |
return;
|
167 |
} |
168 |
|
169 |
/*
|
170 |
* No support for bidirection commands yet.
|
171 |
*/
|
172 |
if (req->elem.out_num > 2 && req->elem.in_num > 3) { |
173 |
virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP); |
174 |
g_free(req); |
175 |
return;
|
176 |
} |
177 |
|
178 |
/*
|
179 |
* The scsi inhdr is placed in the second-to-last input segment, just
|
180 |
* before the regular inhdr.
|
181 |
*/
|
182 |
req->scsi = (void *)req->elem.in_sg[req->elem.in_num - 2].iov_base; |
183 |
|
184 |
memset(&hdr, 0, sizeof(struct sg_io_hdr)); |
185 |
hdr.interface_id = 'S';
|
186 |
hdr.cmd_len = req->elem.out_sg[1].iov_len;
|
187 |
hdr.cmdp = req->elem.out_sg[1].iov_base;
|
188 |
hdr.dxfer_len = 0;
|
189 |
|
190 |
if (req->elem.out_num > 2) { |
191 |
/*
|
192 |
* If there are more than the minimally required 2 output segments
|
193 |
* there is write payload starting from the third iovec.
|
194 |
*/
|
195 |
hdr.dxfer_direction = SG_DXFER_TO_DEV; |
196 |
hdr.iovec_count = req->elem.out_num - 2;
|
197 |
|
198 |
for (i = 0; i < hdr.iovec_count; i++) |
199 |
hdr.dxfer_len += req->elem.out_sg[i + 2].iov_len;
|
200 |
|
201 |
hdr.dxferp = req->elem.out_sg + 2;
|
202 |
|
203 |
} else if (req->elem.in_num > 3) { |
204 |
/*
|
205 |
* If we have more than 3 input segments the guest wants to actually
|
206 |
* read data.
|
207 |
*/
|
208 |
hdr.dxfer_direction = SG_DXFER_FROM_DEV; |
209 |
hdr.iovec_count = req->elem.in_num - 3;
|
210 |
for (i = 0; i < hdr.iovec_count; i++) |
211 |
hdr.dxfer_len += req->elem.in_sg[i].iov_len; |
212 |
|
213 |
hdr.dxferp = req->elem.in_sg; |
214 |
} else {
|
215 |
/*
|
216 |
* Some SCSI commands don't actually transfer any data.
|
217 |
*/
|
218 |
hdr.dxfer_direction = SG_DXFER_NONE; |
219 |
} |
220 |
|
221 |
hdr.sbp = req->elem.in_sg[req->elem.in_num - 3].iov_base;
|
222 |
hdr.mx_sb_len = req->elem.in_sg[req->elem.in_num - 3].iov_len;
|
223 |
|
224 |
ret = bdrv_ioctl(req->dev->bs, SG_IO, &hdr); |
225 |
if (ret) {
|
226 |
status = VIRTIO_BLK_S_UNSUPP; |
227 |
hdr.status = ret; |
228 |
hdr.resid = hdr.dxfer_len; |
229 |
} else if (hdr.status) { |
230 |
status = VIRTIO_BLK_S_IOERR; |
231 |
} else {
|
232 |
status = VIRTIO_BLK_S_OK; |
233 |
} |
234 |
|
235 |
/*
|
236 |
* From SCSI-Generic-HOWTO: "Some lower level drivers (e.g. ide-scsi)
|
237 |
* clear the masked_status field [hence status gets cleared too, see
|
238 |
* block/scsi_ioctl.c] even when a CHECK_CONDITION or COMMAND_TERMINATED
|
239 |
* status has occurred. However they do set DRIVER_SENSE in driver_status
|
240 |
* field. Also a (sb_len_wr > 0) indicates there is a sense buffer.
|
241 |
*/
|
242 |
if (hdr.status == 0 && hdr.sb_len_wr > 0) { |
243 |
hdr.status = CHECK_CONDITION; |
244 |
} |
245 |
|
246 |
stl_p(&req->scsi->errors, |
247 |
hdr.status | (hdr.msg_status << 8) |
|
248 |
(hdr.host_status << 16) | (hdr.driver_status << 24)); |
249 |
stl_p(&req->scsi->residual, hdr.resid); |
250 |
stl_p(&req->scsi->sense_len, hdr.sb_len_wr); |
251 |
stl_p(&req->scsi->data_len, hdr.dxfer_len); |
252 |
|
253 |
virtio_blk_req_complete(req, status); |
254 |
g_free(req); |
255 |
} |
256 |
#else
|
257 |
static void virtio_blk_handle_scsi(VirtIOBlockReq *req) |
258 |
{ |
259 |
virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP); |
260 |
g_free(req); |
261 |
} |
262 |
#endif /* __linux__ */ |
263 |
|
264 |
typedef struct MultiReqBuffer { |
265 |
BlockRequest blkreq[32];
|
266 |
unsigned int num_writes; |
267 |
} MultiReqBuffer; |
268 |
|
269 |
static void virtio_submit_multiwrite(BlockDriverState *bs, MultiReqBuffer *mrb) |
270 |
{ |
271 |
int i, ret;
|
272 |
|
273 |
if (!mrb->num_writes) {
|
274 |
return;
|
275 |
} |
276 |
|
277 |
ret = bdrv_aio_multiwrite(bs, mrb->blkreq, mrb->num_writes); |
278 |
if (ret != 0) { |
279 |
for (i = 0; i < mrb->num_writes; i++) { |
280 |
if (mrb->blkreq[i].error) {
|
281 |
virtio_blk_rw_complete(mrb->blkreq[i].opaque, -EIO); |
282 |
} |
283 |
} |
284 |
} |
285 |
|
286 |
mrb->num_writes = 0;
|
287 |
} |
288 |
|
289 |
static void virtio_blk_handle_flush(VirtIOBlockReq *req, MultiReqBuffer *mrb) |
290 |
{ |
291 |
bdrv_acct_start(req->dev->bs, &req->acct, 0, BDRV_ACCT_FLUSH);
|
292 |
|
293 |
/*
|
294 |
* Make sure all outstanding writes are posted to the backing device.
|
295 |
*/
|
296 |
virtio_submit_multiwrite(req->dev->bs, mrb); |
297 |
bdrv_aio_flush(req->dev->bs, virtio_blk_flush_complete, req); |
298 |
} |
299 |
|
300 |
static void virtio_blk_handle_write(VirtIOBlockReq *req, MultiReqBuffer *mrb) |
301 |
{ |
302 |
BlockRequest *blkreq; |
303 |
uint64_t sector; |
304 |
|
305 |
sector = ldq_p(&req->out->sector); |
306 |
|
307 |
bdrv_acct_start(req->dev->bs, &req->acct, req->qiov.size, BDRV_ACCT_WRITE); |
308 |
|
309 |
trace_virtio_blk_handle_write(req, sector, req->qiov.size / 512);
|
310 |
|
311 |
if (sector & req->dev->sector_mask) {
|
312 |
virtio_blk_rw_complete(req, -EIO); |
313 |
return;
|
314 |
} |
315 |
if (req->qiov.size % req->dev->conf->logical_block_size) {
|
316 |
virtio_blk_rw_complete(req, -EIO); |
317 |
return;
|
318 |
} |
319 |
|
320 |
if (mrb->num_writes == 32) { |
321 |
virtio_submit_multiwrite(req->dev->bs, mrb); |
322 |
} |
323 |
|
324 |
blkreq = &mrb->blkreq[mrb->num_writes]; |
325 |
blkreq->sector = sector; |
326 |
blkreq->nb_sectors = req->qiov.size / BDRV_SECTOR_SIZE; |
327 |
blkreq->qiov = &req->qiov; |
328 |
blkreq->cb = virtio_blk_rw_complete; |
329 |
blkreq->opaque = req; |
330 |
blkreq->error = 0;
|
331 |
|
332 |
mrb->num_writes++; |
333 |
} |
334 |
|
335 |
static void virtio_blk_handle_read(VirtIOBlockReq *req) |
336 |
{ |
337 |
uint64_t sector; |
338 |
|
339 |
sector = ldq_p(&req->out->sector); |
340 |
|
341 |
bdrv_acct_start(req->dev->bs, &req->acct, req->qiov.size, BDRV_ACCT_READ); |
342 |
|
343 |
if (sector & req->dev->sector_mask) {
|
344 |
virtio_blk_rw_complete(req, -EIO); |
345 |
return;
|
346 |
} |
347 |
if (req->qiov.size % req->dev->conf->logical_block_size) {
|
348 |
virtio_blk_rw_complete(req, -EIO); |
349 |
return;
|
350 |
} |
351 |
bdrv_aio_readv(req->dev->bs, sector, &req->qiov, |
352 |
req->qiov.size / BDRV_SECTOR_SIZE, |
353 |
virtio_blk_rw_complete, req); |
354 |
} |
355 |
|
356 |
static void virtio_blk_handle_request(VirtIOBlockReq *req, |
357 |
MultiReqBuffer *mrb) |
358 |
{ |
359 |
uint32_t type; |
360 |
|
361 |
if (req->elem.out_num < 1 || req->elem.in_num < 1) { |
362 |
error_report("virtio-blk missing headers");
|
363 |
exit(1);
|
364 |
} |
365 |
|
366 |
if (req->elem.out_sg[0].iov_len < sizeof(*req->out) || |
367 |
req->elem.in_sg[req->elem.in_num - 1].iov_len < sizeof(*req->in)) { |
368 |
error_report("virtio-blk header not in correct element");
|
369 |
exit(1);
|
370 |
} |
371 |
|
372 |
req->out = (void *)req->elem.out_sg[0].iov_base; |
373 |
req->in = (void *)req->elem.in_sg[req->elem.in_num - 1].iov_base; |
374 |
|
375 |
type = ldl_p(&req->out->type); |
376 |
|
377 |
if (type & VIRTIO_BLK_T_FLUSH) {
|
378 |
virtio_blk_handle_flush(req, mrb); |
379 |
} else if (type & VIRTIO_BLK_T_SCSI_CMD) { |
380 |
virtio_blk_handle_scsi(req); |
381 |
} else if (type & VIRTIO_BLK_T_GET_ID) { |
382 |
VirtIOBlock *s = req->dev; |
383 |
|
384 |
/*
|
385 |
* NB: per existing s/n string convention the string is
|
386 |
* terminated by '\0' only when shorter than buffer.
|
387 |
*/
|
388 |
strncpy(req->elem.in_sg[0].iov_base,
|
389 |
s->serial ? s->serial : "",
|
390 |
MIN(req->elem.in_sg[0].iov_len, VIRTIO_BLK_ID_BYTES));
|
391 |
virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); |
392 |
g_free(req); |
393 |
} else if (type & VIRTIO_BLK_T_OUT) { |
394 |
qemu_iovec_init_external(&req->qiov, &req->elem.out_sg[1],
|
395 |
req->elem.out_num - 1);
|
396 |
virtio_blk_handle_write(req, mrb); |
397 |
} else {
|
398 |
qemu_iovec_init_external(&req->qiov, &req->elem.in_sg[0],
|
399 |
req->elem.in_num - 1);
|
400 |
virtio_blk_handle_read(req); |
401 |
} |
402 |
} |
403 |
|
404 |
static void virtio_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq) |
405 |
{ |
406 |
VirtIOBlock *s = to_virtio_blk(vdev); |
407 |
VirtIOBlockReq *req; |
408 |
MultiReqBuffer mrb = { |
409 |
.num_writes = 0,
|
410 |
}; |
411 |
|
412 |
while ((req = virtio_blk_get_request(s))) {
|
413 |
virtio_blk_handle_request(req, &mrb); |
414 |
} |
415 |
|
416 |
virtio_submit_multiwrite(s->bs, &mrb); |
417 |
|
418 |
/*
|
419 |
* FIXME: Want to check for completions before returning to guest mode,
|
420 |
* so cached reads and writes are reported as quickly as possible. But
|
421 |
* that should be done in the generic block layer.
|
422 |
*/
|
423 |
} |
424 |
|
425 |
static void virtio_blk_dma_restart_bh(void *opaque) |
426 |
{ |
427 |
VirtIOBlock *s = opaque; |
428 |
VirtIOBlockReq *req = s->rq; |
429 |
MultiReqBuffer mrb = { |
430 |
.num_writes = 0,
|
431 |
}; |
432 |
|
433 |
qemu_bh_delete(s->bh); |
434 |
s->bh = NULL;
|
435 |
|
436 |
s->rq = NULL;
|
437 |
|
438 |
while (req) {
|
439 |
virtio_blk_handle_request(req, &mrb); |
440 |
req = req->next; |
441 |
} |
442 |
|
443 |
virtio_submit_multiwrite(s->bs, &mrb); |
444 |
} |
445 |
|
446 |
static void virtio_blk_dma_restart_cb(void *opaque, int running, |
447 |
RunState state) |
448 |
{ |
449 |
VirtIOBlock *s = opaque; |
450 |
|
451 |
if (!running)
|
452 |
return;
|
453 |
|
454 |
if (!s->bh) {
|
455 |
s->bh = qemu_bh_new(virtio_blk_dma_restart_bh, s); |
456 |
qemu_bh_schedule(s->bh); |
457 |
} |
458 |
} |
459 |
|
460 |
static void virtio_blk_reset(VirtIODevice *vdev) |
461 |
{ |
462 |
/*
|
463 |
* This should cancel pending requests, but can't do nicely until there
|
464 |
* are per-device request lists.
|
465 |
*/
|
466 |
bdrv_drain_all(); |
467 |
} |
468 |
|
469 |
/* coalesce internal state, copy to pci i/o region 0
|
470 |
*/
|
471 |
static void virtio_blk_update_config(VirtIODevice *vdev, uint8_t *config) |
472 |
{ |
473 |
VirtIOBlock *s = to_virtio_blk(vdev); |
474 |
struct virtio_blk_config blkcfg;
|
475 |
uint64_t capacity; |
476 |
int cylinders, heads, secs;
|
477 |
int blk_size = s->conf->logical_block_size;
|
478 |
|
479 |
bdrv_get_geometry(s->bs, &capacity); |
480 |
bdrv_get_geometry_hint(s->bs, &cylinders, &heads, &secs); |
481 |
memset(&blkcfg, 0, sizeof(blkcfg)); |
482 |
stq_raw(&blkcfg.capacity, capacity); |
483 |
stl_raw(&blkcfg.seg_max, 128 - 2); |
484 |
stw_raw(&blkcfg.cylinders, cylinders); |
485 |
stl_raw(&blkcfg.blk_size, blk_size); |
486 |
stw_raw(&blkcfg.min_io_size, s->conf->min_io_size / blk_size); |
487 |
stw_raw(&blkcfg.opt_io_size, s->conf->opt_io_size / blk_size); |
488 |
blkcfg.heads = heads; |
489 |
blkcfg.sectors = secs & ~s->sector_mask; |
490 |
blkcfg.size_max = 0;
|
491 |
blkcfg.physical_block_exp = get_physical_block_exp(s->conf); |
492 |
blkcfg.alignment_offset = 0;
|
493 |
memcpy(config, &blkcfg, sizeof(struct virtio_blk_config)); |
494 |
} |
495 |
|
496 |
static uint32_t virtio_blk_get_features(VirtIODevice *vdev, uint32_t features)
|
497 |
{ |
498 |
VirtIOBlock *s = to_virtio_blk(vdev); |
499 |
|
500 |
features |= (1 << VIRTIO_BLK_F_SEG_MAX);
|
501 |
features |= (1 << VIRTIO_BLK_F_GEOMETRY);
|
502 |
features |= (1 << VIRTIO_BLK_F_TOPOLOGY);
|
503 |
features |= (1 << VIRTIO_BLK_F_BLK_SIZE);
|
504 |
|
505 |
if (bdrv_enable_write_cache(s->bs))
|
506 |
features |= (1 << VIRTIO_BLK_F_WCACHE);
|
507 |
|
508 |
if (bdrv_is_read_only(s->bs))
|
509 |
features |= 1 << VIRTIO_BLK_F_RO;
|
510 |
|
511 |
return features;
|
512 |
} |
513 |
|
514 |
static void virtio_blk_save(QEMUFile *f, void *opaque) |
515 |
{ |
516 |
VirtIOBlock *s = opaque; |
517 |
VirtIOBlockReq *req = s->rq; |
518 |
|
519 |
virtio_save(&s->vdev, f); |
520 |
|
521 |
while (req) {
|
522 |
qemu_put_sbyte(f, 1);
|
523 |
qemu_put_buffer(f, (unsigned char*)&req->elem, sizeof(req->elem)); |
524 |
req = req->next; |
525 |
} |
526 |
qemu_put_sbyte(f, 0);
|
527 |
} |
528 |
|
529 |
static int virtio_blk_load(QEMUFile *f, void *opaque, int version_id) |
530 |
{ |
531 |
VirtIOBlock *s = opaque; |
532 |
|
533 |
if (version_id != 2) |
534 |
return -EINVAL;
|
535 |
|
536 |
virtio_load(&s->vdev, f); |
537 |
while (qemu_get_sbyte(f)) {
|
538 |
VirtIOBlockReq *req = virtio_blk_alloc_request(s); |
539 |
qemu_get_buffer(f, (unsigned char*)&req->elem, sizeof(req->elem)); |
540 |
req->next = s->rq; |
541 |
s->rq = req; |
542 |
|
543 |
virtqueue_map_sg(req->elem.in_sg, req->elem.in_addr, |
544 |
req->elem.in_num, 1);
|
545 |
virtqueue_map_sg(req->elem.out_sg, req->elem.out_addr, |
546 |
req->elem.out_num, 0);
|
547 |
} |
548 |
|
549 |
return 0; |
550 |
} |
551 |
|
552 |
static void virtio_blk_resize(void *opaque) |
553 |
{ |
554 |
VirtIOBlock *s = opaque; |
555 |
|
556 |
virtio_notify_config(&s->vdev); |
557 |
} |
558 |
|
559 |
static const BlockDevOps virtio_block_ops = { |
560 |
.resize_cb = virtio_blk_resize, |
561 |
}; |
562 |
|
563 |
VirtIODevice *virtio_blk_init(DeviceState *dev, BlockConf *conf, |
564 |
char **serial)
|
565 |
{ |
566 |
VirtIOBlock *s; |
567 |
int cylinders, heads, secs;
|
568 |
static int virtio_blk_id; |
569 |
DriveInfo *dinfo; |
570 |
|
571 |
if (!conf->bs) {
|
572 |
error_report("virtio-blk-pci: drive property not set");
|
573 |
return NULL; |
574 |
} |
575 |
if (!bdrv_is_inserted(conf->bs)) {
|
576 |
error_report("Device needs media, but drive is empty");
|
577 |
return NULL; |
578 |
} |
579 |
|
580 |
if (!*serial) {
|
581 |
/* try to fall back to value set with legacy -drive serial=... */
|
582 |
dinfo = drive_get_by_blockdev(conf->bs); |
583 |
if (*dinfo->serial) {
|
584 |
*serial = strdup(dinfo->serial); |
585 |
} |
586 |
} |
587 |
|
588 |
s = (VirtIOBlock *)virtio_common_init("virtio-blk", VIRTIO_ID_BLOCK,
|
589 |
sizeof(struct virtio_blk_config), |
590 |
sizeof(VirtIOBlock));
|
591 |
|
592 |
s->vdev.get_config = virtio_blk_update_config; |
593 |
s->vdev.get_features = virtio_blk_get_features; |
594 |
s->vdev.reset = virtio_blk_reset; |
595 |
s->bs = conf->bs; |
596 |
s->conf = conf; |
597 |
s->serial = *serial; |
598 |
s->rq = NULL;
|
599 |
s->sector_mask = (s->conf->logical_block_size / BDRV_SECTOR_SIZE) - 1;
|
600 |
bdrv_guess_geometry(s->bs, &cylinders, &heads, &secs); |
601 |
|
602 |
s->vq = virtio_add_queue(&s->vdev, 128, virtio_blk_handle_output);
|
603 |
|
604 |
qemu_add_vm_change_state_handler(virtio_blk_dma_restart_cb, s); |
605 |
s->qdev = dev; |
606 |
register_savevm(dev, "virtio-blk", virtio_blk_id++, 2, |
607 |
virtio_blk_save, virtio_blk_load, s); |
608 |
bdrv_set_dev_ops(s->bs, &virtio_block_ops, s); |
609 |
bdrv_set_buffer_alignment(s->bs, conf->logical_block_size); |
610 |
|
611 |
bdrv_iostatus_enable(s->bs); |
612 |
add_boot_device_path(conf->bootindex, dev, "/disk@0,0");
|
613 |
|
614 |
return &s->vdev;
|
615 |
} |
616 |
|
617 |
void virtio_blk_exit(VirtIODevice *vdev)
|
618 |
{ |
619 |
VirtIOBlock *s = to_virtio_blk(vdev); |
620 |
unregister_savevm(s->qdev, "virtio-blk", s);
|
621 |
virtio_cleanup(vdev); |
622 |
} |