root / hw / virtio-blk.c @ 7830cf78
History | View | Annotate | Download (19.4 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-report.h" |
16 |
#include "trace.h" |
17 |
#include "hw/block-common.h" |
18 |
#include "sysemu/blockdev.h" |
19 |
#include "virtio-blk.h" |
20 |
#ifdef CONFIG_VIRTIO_BLK_DATA_PLANE
|
21 |
#include "hw/dataplane/virtio-blk.h" |
22 |
#endif
|
23 |
#include "scsi-defs.h" |
24 |
#ifdef __linux__
|
25 |
# include <scsi/sg.h> |
26 |
#endif
|
27 |
|
28 |
typedef struct VirtIOBlock |
29 |
{ |
30 |
VirtIODevice vdev; |
31 |
BlockDriverState *bs; |
32 |
VirtQueue *vq; |
33 |
void *rq;
|
34 |
QEMUBH *bh; |
35 |
BlockConf *conf; |
36 |
VirtIOBlkConf *blk; |
37 |
unsigned short sector_mask; |
38 |
DeviceState *qdev; |
39 |
VMChangeStateEntry *change; |
40 |
#ifdef CONFIG_VIRTIO_BLK_DATA_PLANE
|
41 |
VirtIOBlockDataPlane *dataplane; |
42 |
#endif
|
43 |
} VirtIOBlock; |
44 |
|
45 |
static VirtIOBlock *to_virtio_blk(VirtIODevice *vdev)
|
46 |
{ |
47 |
return (VirtIOBlock *)vdev;
|
48 |
} |
49 |
|
50 |
typedef struct VirtIOBlockReq |
51 |
{ |
52 |
VirtIOBlock *dev; |
53 |
VirtQueueElement elem; |
54 |
struct virtio_blk_inhdr *in;
|
55 |
struct virtio_blk_outhdr *out;
|
56 |
struct virtio_scsi_inhdr *scsi;
|
57 |
QEMUIOVector qiov; |
58 |
struct VirtIOBlockReq *next;
|
59 |
BlockAcctCookie acct; |
60 |
} VirtIOBlockReq; |
61 |
|
62 |
static void virtio_blk_req_complete(VirtIOBlockReq *req, int status) |
63 |
{ |
64 |
VirtIOBlock *s = req->dev; |
65 |
|
66 |
trace_virtio_blk_req_complete(req, status); |
67 |
|
68 |
stb_p(&req->in->status, status); |
69 |
virtqueue_push(s->vq, &req->elem, req->qiov.size + sizeof(*req->in));
|
70 |
virtio_notify(&s->vdev, s->vq); |
71 |
} |
72 |
|
73 |
static int virtio_blk_handle_rw_error(VirtIOBlockReq *req, int error, |
74 |
bool is_read)
|
75 |
{ |
76 |
BlockErrorAction action = bdrv_get_error_action(req->dev->bs, is_read, error); |
77 |
VirtIOBlock *s = req->dev; |
78 |
|
79 |
if (action == BDRV_ACTION_STOP) {
|
80 |
req->next = s->rq; |
81 |
s->rq = req; |
82 |
} else if (action == BDRV_ACTION_REPORT) { |
83 |
virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR); |
84 |
bdrv_acct_done(s->bs, &req->acct); |
85 |
g_free(req); |
86 |
} |
87 |
|
88 |
bdrv_error_action(s->bs, action, is_read, error); |
89 |
return action != BDRV_ACTION_IGNORE;
|
90 |
} |
91 |
|
92 |
static void virtio_blk_rw_complete(void *opaque, int ret) |
93 |
{ |
94 |
VirtIOBlockReq *req = opaque; |
95 |
|
96 |
trace_virtio_blk_rw_complete(req, ret); |
97 |
|
98 |
if (ret) {
|
99 |
bool is_read = !(ldl_p(&req->out->type) & VIRTIO_BLK_T_OUT);
|
100 |
if (virtio_blk_handle_rw_error(req, -ret, is_read))
|
101 |
return;
|
102 |
} |
103 |
|
104 |
virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); |
105 |
bdrv_acct_done(req->dev->bs, &req->acct); |
106 |
g_free(req); |
107 |
} |
108 |
|
109 |
static void virtio_blk_flush_complete(void *opaque, int ret) |
110 |
{ |
111 |
VirtIOBlockReq *req = opaque; |
112 |
|
113 |
if (ret) {
|
114 |
if (virtio_blk_handle_rw_error(req, -ret, 0)) { |
115 |
return;
|
116 |
} |
117 |
} |
118 |
|
119 |
virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); |
120 |
bdrv_acct_done(req->dev->bs, &req->acct); |
121 |
g_free(req); |
122 |
} |
123 |
|
124 |
static VirtIOBlockReq *virtio_blk_alloc_request(VirtIOBlock *s)
|
125 |
{ |
126 |
VirtIOBlockReq *req = g_malloc(sizeof(*req));
|
127 |
req->dev = s; |
128 |
req->qiov.size = 0;
|
129 |
req->next = NULL;
|
130 |
return req;
|
131 |
} |
132 |
|
133 |
static VirtIOBlockReq *virtio_blk_get_request(VirtIOBlock *s)
|
134 |
{ |
135 |
VirtIOBlockReq *req = virtio_blk_alloc_request(s); |
136 |
|
137 |
if (req != NULL) { |
138 |
if (!virtqueue_pop(s->vq, &req->elem)) {
|
139 |
g_free(req); |
140 |
return NULL; |
141 |
} |
142 |
} |
143 |
|
144 |
return req;
|
145 |
} |
146 |
|
147 |
static void virtio_blk_handle_scsi(VirtIOBlockReq *req) |
148 |
{ |
149 |
#ifdef __linux__
|
150 |
int ret;
|
151 |
int i;
|
152 |
#endif
|
153 |
int status = VIRTIO_BLK_S_OK;
|
154 |
|
155 |
/*
|
156 |
* We require at least one output segment each for the virtio_blk_outhdr
|
157 |
* and the SCSI command block.
|
158 |
*
|
159 |
* We also at least require the virtio_blk_inhdr, the virtio_scsi_inhdr
|
160 |
* and the sense buffer pointer in the input segments.
|
161 |
*/
|
162 |
if (req->elem.out_num < 2 || req->elem.in_num < 3) { |
163 |
virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR); |
164 |
g_free(req); |
165 |
return;
|
166 |
} |
167 |
|
168 |
/*
|
169 |
* The scsi inhdr is placed in the second-to-last input segment, just
|
170 |
* before the regular inhdr.
|
171 |
*/
|
172 |
req->scsi = (void *)req->elem.in_sg[req->elem.in_num - 2].iov_base; |
173 |
|
174 |
if (!req->dev->blk->scsi) {
|
175 |
status = VIRTIO_BLK_S_UNSUPP; |
176 |
goto fail;
|
177 |
} |
178 |
|
179 |
/*
|
180 |
* No support for bidirection commands yet.
|
181 |
*/
|
182 |
if (req->elem.out_num > 2 && req->elem.in_num > 3) { |
183 |
status = VIRTIO_BLK_S_UNSUPP; |
184 |
goto fail;
|
185 |
} |
186 |
|
187 |
#ifdef __linux__
|
188 |
struct sg_io_hdr hdr;
|
189 |
memset(&hdr, 0, sizeof(struct sg_io_hdr)); |
190 |
hdr.interface_id = 'S';
|
191 |
hdr.cmd_len = req->elem.out_sg[1].iov_len;
|
192 |
hdr.cmdp = req->elem.out_sg[1].iov_base;
|
193 |
hdr.dxfer_len = 0;
|
194 |
|
195 |
if (req->elem.out_num > 2) { |
196 |
/*
|
197 |
* If there are more than the minimally required 2 output segments
|
198 |
* there is write payload starting from the third iovec.
|
199 |
*/
|
200 |
hdr.dxfer_direction = SG_DXFER_TO_DEV; |
201 |
hdr.iovec_count = req->elem.out_num - 2;
|
202 |
|
203 |
for (i = 0; i < hdr.iovec_count; i++) |
204 |
hdr.dxfer_len += req->elem.out_sg[i + 2].iov_len;
|
205 |
|
206 |
hdr.dxferp = req->elem.out_sg + 2;
|
207 |
|
208 |
} else if (req->elem.in_num > 3) { |
209 |
/*
|
210 |
* If we have more than 3 input segments the guest wants to actually
|
211 |
* read data.
|
212 |
*/
|
213 |
hdr.dxfer_direction = SG_DXFER_FROM_DEV; |
214 |
hdr.iovec_count = req->elem.in_num - 3;
|
215 |
for (i = 0; i < hdr.iovec_count; i++) |
216 |
hdr.dxfer_len += req->elem.in_sg[i].iov_len; |
217 |
|
218 |
hdr.dxferp = req->elem.in_sg; |
219 |
} else {
|
220 |
/*
|
221 |
* Some SCSI commands don't actually transfer any data.
|
222 |
*/
|
223 |
hdr.dxfer_direction = SG_DXFER_NONE; |
224 |
} |
225 |
|
226 |
hdr.sbp = req->elem.in_sg[req->elem.in_num - 3].iov_base;
|
227 |
hdr.mx_sb_len = req->elem.in_sg[req->elem.in_num - 3].iov_len;
|
228 |
|
229 |
ret = bdrv_ioctl(req->dev->bs, SG_IO, &hdr); |
230 |
if (ret) {
|
231 |
status = VIRTIO_BLK_S_UNSUPP; |
232 |
goto fail;
|
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 |
return;
|
256 |
#else
|
257 |
abort(); |
258 |
#endif
|
259 |
|
260 |
fail:
|
261 |
/* Just put anything nonzero so that the ioctl fails in the guest. */
|
262 |
stl_p(&req->scsi->errors, 255);
|
263 |
virtio_blk_req_complete(req, status); |
264 |
g_free(req); |
265 |
} |
266 |
|
267 |
typedef struct MultiReqBuffer { |
268 |
BlockRequest blkreq[32];
|
269 |
unsigned int num_writes; |
270 |
} MultiReqBuffer; |
271 |
|
272 |
static void virtio_submit_multiwrite(BlockDriverState *bs, MultiReqBuffer *mrb) |
273 |
{ |
274 |
int i, ret;
|
275 |
|
276 |
if (!mrb->num_writes) {
|
277 |
return;
|
278 |
} |
279 |
|
280 |
ret = bdrv_aio_multiwrite(bs, mrb->blkreq, mrb->num_writes); |
281 |
if (ret != 0) { |
282 |
for (i = 0; i < mrb->num_writes; i++) { |
283 |
if (mrb->blkreq[i].error) {
|
284 |
virtio_blk_rw_complete(mrb->blkreq[i].opaque, -EIO); |
285 |
} |
286 |
} |
287 |
} |
288 |
|
289 |
mrb->num_writes = 0;
|
290 |
} |
291 |
|
292 |
static void virtio_blk_handle_flush(VirtIOBlockReq *req, MultiReqBuffer *mrb) |
293 |
{ |
294 |
bdrv_acct_start(req->dev->bs, &req->acct, 0, BDRV_ACCT_FLUSH);
|
295 |
|
296 |
/*
|
297 |
* Make sure all outstanding writes are posted to the backing device.
|
298 |
*/
|
299 |
virtio_submit_multiwrite(req->dev->bs, mrb); |
300 |
bdrv_aio_flush(req->dev->bs, virtio_blk_flush_complete, req); |
301 |
} |
302 |
|
303 |
static void virtio_blk_handle_write(VirtIOBlockReq *req, MultiReqBuffer *mrb) |
304 |
{ |
305 |
BlockRequest *blkreq; |
306 |
uint64_t sector; |
307 |
|
308 |
sector = ldq_p(&req->out->sector); |
309 |
|
310 |
bdrv_acct_start(req->dev->bs, &req->acct, req->qiov.size, BDRV_ACCT_WRITE); |
311 |
|
312 |
trace_virtio_blk_handle_write(req, sector, req->qiov.size / 512);
|
313 |
|
314 |
if (sector & req->dev->sector_mask) {
|
315 |
virtio_blk_rw_complete(req, -EIO); |
316 |
return;
|
317 |
} |
318 |
if (req->qiov.size % req->dev->conf->logical_block_size) {
|
319 |
virtio_blk_rw_complete(req, -EIO); |
320 |
return;
|
321 |
} |
322 |
|
323 |
if (mrb->num_writes == 32) { |
324 |
virtio_submit_multiwrite(req->dev->bs, mrb); |
325 |
} |
326 |
|
327 |
blkreq = &mrb->blkreq[mrb->num_writes]; |
328 |
blkreq->sector = sector; |
329 |
blkreq->nb_sectors = req->qiov.size / BDRV_SECTOR_SIZE; |
330 |
blkreq->qiov = &req->qiov; |
331 |
blkreq->cb = virtio_blk_rw_complete; |
332 |
blkreq->opaque = req; |
333 |
blkreq->error = 0;
|
334 |
|
335 |
mrb->num_writes++; |
336 |
} |
337 |
|
338 |
static void virtio_blk_handle_read(VirtIOBlockReq *req) |
339 |
{ |
340 |
uint64_t sector; |
341 |
|
342 |
sector = ldq_p(&req->out->sector); |
343 |
|
344 |
bdrv_acct_start(req->dev->bs, &req->acct, req->qiov.size, BDRV_ACCT_READ); |
345 |
|
346 |
trace_virtio_blk_handle_read(req, sector, req->qiov.size / 512);
|
347 |
|
348 |
if (sector & req->dev->sector_mask) {
|
349 |
virtio_blk_rw_complete(req, -EIO); |
350 |
return;
|
351 |
} |
352 |
if (req->qiov.size % req->dev->conf->logical_block_size) {
|
353 |
virtio_blk_rw_complete(req, -EIO); |
354 |
return;
|
355 |
} |
356 |
bdrv_aio_readv(req->dev->bs, sector, &req->qiov, |
357 |
req->qiov.size / BDRV_SECTOR_SIZE, |
358 |
virtio_blk_rw_complete, req); |
359 |
} |
360 |
|
361 |
static void virtio_blk_handle_request(VirtIOBlockReq *req, |
362 |
MultiReqBuffer *mrb) |
363 |
{ |
364 |
uint32_t type; |
365 |
|
366 |
if (req->elem.out_num < 1 || req->elem.in_num < 1) { |
367 |
error_report("virtio-blk missing headers");
|
368 |
exit(1);
|
369 |
} |
370 |
|
371 |
if (req->elem.out_sg[0].iov_len < sizeof(*req->out) || |
372 |
req->elem.in_sg[req->elem.in_num - 1].iov_len < sizeof(*req->in)) { |
373 |
error_report("virtio-blk header not in correct element");
|
374 |
exit(1);
|
375 |
} |
376 |
|
377 |
req->out = (void *)req->elem.out_sg[0].iov_base; |
378 |
req->in = (void *)req->elem.in_sg[req->elem.in_num - 1].iov_base; |
379 |
|
380 |
type = ldl_p(&req->out->type); |
381 |
|
382 |
if (type & VIRTIO_BLK_T_FLUSH) {
|
383 |
virtio_blk_handle_flush(req, mrb); |
384 |
} else if (type & VIRTIO_BLK_T_SCSI_CMD) { |
385 |
virtio_blk_handle_scsi(req); |
386 |
} else if (type & VIRTIO_BLK_T_GET_ID) { |
387 |
VirtIOBlock *s = req->dev; |
388 |
|
389 |
/*
|
390 |
* NB: per existing s/n string convention the string is
|
391 |
* terminated by '\0' only when shorter than buffer.
|
392 |
*/
|
393 |
strncpy(req->elem.in_sg[0].iov_base,
|
394 |
s->blk->serial ? s->blk->serial : "",
|
395 |
MIN(req->elem.in_sg[0].iov_len, VIRTIO_BLK_ID_BYTES));
|
396 |
virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); |
397 |
g_free(req); |
398 |
} else if (type & VIRTIO_BLK_T_OUT) { |
399 |
qemu_iovec_init_external(&req->qiov, &req->elem.out_sg[1],
|
400 |
req->elem.out_num - 1);
|
401 |
virtio_blk_handle_write(req, mrb); |
402 |
} else if (type == VIRTIO_BLK_T_IN || type == VIRTIO_BLK_T_BARRIER) { |
403 |
/* VIRTIO_BLK_T_IN is 0, so we can't just & it. */
|
404 |
qemu_iovec_init_external(&req->qiov, &req->elem.in_sg[0],
|
405 |
req->elem.in_num - 1);
|
406 |
virtio_blk_handle_read(req); |
407 |
} else {
|
408 |
virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP); |
409 |
g_free(req); |
410 |
} |
411 |
} |
412 |
|
413 |
static void virtio_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq) |
414 |
{ |
415 |
VirtIOBlock *s = to_virtio_blk(vdev); |
416 |
VirtIOBlockReq *req; |
417 |
MultiReqBuffer mrb = { |
418 |
.num_writes = 0,
|
419 |
}; |
420 |
|
421 |
#ifdef CONFIG_VIRTIO_BLK_DATA_PLANE
|
422 |
/* Some guests kick before setting VIRTIO_CONFIG_S_DRIVER_OK so start
|
423 |
* dataplane here instead of waiting for .set_status().
|
424 |
*/
|
425 |
if (s->dataplane) {
|
426 |
virtio_blk_data_plane_start(s->dataplane); |
427 |
return;
|
428 |
} |
429 |
#endif
|
430 |
|
431 |
while ((req = virtio_blk_get_request(s))) {
|
432 |
virtio_blk_handle_request(req, &mrb); |
433 |
} |
434 |
|
435 |
virtio_submit_multiwrite(s->bs, &mrb); |
436 |
|
437 |
/*
|
438 |
* FIXME: Want to check for completions before returning to guest mode,
|
439 |
* so cached reads and writes are reported as quickly as possible. But
|
440 |
* that should be done in the generic block layer.
|
441 |
*/
|
442 |
} |
443 |
|
444 |
static void virtio_blk_dma_restart_bh(void *opaque) |
445 |
{ |
446 |
VirtIOBlock *s = opaque; |
447 |
VirtIOBlockReq *req = s->rq; |
448 |
MultiReqBuffer mrb = { |
449 |
.num_writes = 0,
|
450 |
}; |
451 |
|
452 |
qemu_bh_delete(s->bh); |
453 |
s->bh = NULL;
|
454 |
|
455 |
s->rq = NULL;
|
456 |
|
457 |
while (req) {
|
458 |
virtio_blk_handle_request(req, &mrb); |
459 |
req = req->next; |
460 |
} |
461 |
|
462 |
virtio_submit_multiwrite(s->bs, &mrb); |
463 |
} |
464 |
|
465 |
static void virtio_blk_dma_restart_cb(void *opaque, int running, |
466 |
RunState state) |
467 |
{ |
468 |
VirtIOBlock *s = opaque; |
469 |
|
470 |
if (!running) {
|
471 |
return;
|
472 |
} |
473 |
|
474 |
if (!s->bh) {
|
475 |
s->bh = qemu_bh_new(virtio_blk_dma_restart_bh, s); |
476 |
qemu_bh_schedule(s->bh); |
477 |
} |
478 |
} |
479 |
|
480 |
static void virtio_blk_reset(VirtIODevice *vdev) |
481 |
{ |
482 |
#ifdef CONFIG_VIRTIO_BLK_DATA_PLANE
|
483 |
VirtIOBlock *s = to_virtio_blk(vdev); |
484 |
|
485 |
if (s->dataplane) {
|
486 |
virtio_blk_data_plane_stop(s->dataplane); |
487 |
} |
488 |
#endif
|
489 |
|
490 |
/*
|
491 |
* This should cancel pending requests, but can't do nicely until there
|
492 |
* are per-device request lists.
|
493 |
*/
|
494 |
bdrv_drain_all(); |
495 |
} |
496 |
|
497 |
/* coalesce internal state, copy to pci i/o region 0
|
498 |
*/
|
499 |
static void virtio_blk_update_config(VirtIODevice *vdev, uint8_t *config) |
500 |
{ |
501 |
VirtIOBlock *s = to_virtio_blk(vdev); |
502 |
struct virtio_blk_config blkcfg;
|
503 |
uint64_t capacity; |
504 |
int blk_size = s->conf->logical_block_size;
|
505 |
|
506 |
bdrv_get_geometry(s->bs, &capacity); |
507 |
memset(&blkcfg, 0, sizeof(blkcfg)); |
508 |
stq_raw(&blkcfg.capacity, capacity); |
509 |
stl_raw(&blkcfg.seg_max, 128 - 2); |
510 |
stw_raw(&blkcfg.cylinders, s->conf->cyls); |
511 |
stl_raw(&blkcfg.blk_size, blk_size); |
512 |
stw_raw(&blkcfg.min_io_size, s->conf->min_io_size / blk_size); |
513 |
stw_raw(&blkcfg.opt_io_size, s->conf->opt_io_size / blk_size); |
514 |
blkcfg.heads = s->conf->heads; |
515 |
/*
|
516 |
* We must ensure that the block device capacity is a multiple of
|
517 |
* the logical block size. If that is not the case, lets use
|
518 |
* sector_mask to adopt the geometry to have a correct picture.
|
519 |
* For those devices where the capacity is ok for the given geometry
|
520 |
* we dont touch the sector value of the geometry, since some devices
|
521 |
* (like s390 dasd) need a specific value. Here the capacity is already
|
522 |
* cyls*heads*secs*blk_size and the sector value is not block size
|
523 |
* divided by 512 - instead it is the amount of blk_size blocks
|
524 |
* per track (cylinder).
|
525 |
*/
|
526 |
if (bdrv_getlength(s->bs) / s->conf->heads / s->conf->secs % blk_size) {
|
527 |
blkcfg.sectors = s->conf->secs & ~s->sector_mask; |
528 |
} else {
|
529 |
blkcfg.sectors = s->conf->secs; |
530 |
} |
531 |
blkcfg.size_max = 0;
|
532 |
blkcfg.physical_block_exp = get_physical_block_exp(s->conf); |
533 |
blkcfg.alignment_offset = 0;
|
534 |
blkcfg.wce = bdrv_enable_write_cache(s->bs); |
535 |
memcpy(config, &blkcfg, sizeof(struct virtio_blk_config)); |
536 |
} |
537 |
|
538 |
static void virtio_blk_set_config(VirtIODevice *vdev, const uint8_t *config) |
539 |
{ |
540 |
VirtIOBlock *s = to_virtio_blk(vdev); |
541 |
struct virtio_blk_config blkcfg;
|
542 |
|
543 |
memcpy(&blkcfg, config, sizeof(blkcfg));
|
544 |
bdrv_set_enable_write_cache(s->bs, blkcfg.wce != 0);
|
545 |
} |
546 |
|
547 |
static uint32_t virtio_blk_get_features(VirtIODevice *vdev, uint32_t features)
|
548 |
{ |
549 |
VirtIOBlock *s = to_virtio_blk(vdev); |
550 |
|
551 |
features |= (1 << VIRTIO_BLK_F_SEG_MAX);
|
552 |
features |= (1 << VIRTIO_BLK_F_GEOMETRY);
|
553 |
features |= (1 << VIRTIO_BLK_F_TOPOLOGY);
|
554 |
features |= (1 << VIRTIO_BLK_F_BLK_SIZE);
|
555 |
features |= (1 << VIRTIO_BLK_F_SCSI);
|
556 |
|
557 |
if (s->blk->config_wce) {
|
558 |
features |= (1 << VIRTIO_BLK_F_CONFIG_WCE);
|
559 |
} |
560 |
if (bdrv_enable_write_cache(s->bs))
|
561 |
features |= (1 << VIRTIO_BLK_F_WCE);
|
562 |
|
563 |
if (bdrv_is_read_only(s->bs))
|
564 |
features |= 1 << VIRTIO_BLK_F_RO;
|
565 |
|
566 |
return features;
|
567 |
} |
568 |
|
569 |
static void virtio_blk_set_status(VirtIODevice *vdev, uint8_t status) |
570 |
{ |
571 |
VirtIOBlock *s = to_virtio_blk(vdev); |
572 |
uint32_t features; |
573 |
|
574 |
#ifdef CONFIG_VIRTIO_BLK_DATA_PLANE
|
575 |
if (s->dataplane && !(status & (VIRTIO_CONFIG_S_DRIVER |
|
576 |
VIRTIO_CONFIG_S_DRIVER_OK))) { |
577 |
virtio_blk_data_plane_stop(s->dataplane); |
578 |
} |
579 |
#endif
|
580 |
|
581 |
if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
|
582 |
return;
|
583 |
} |
584 |
|
585 |
features = vdev->guest_features; |
586 |
bdrv_set_enable_write_cache(s->bs, !!(features & (1 << VIRTIO_BLK_F_WCE)));
|
587 |
} |
588 |
|
589 |
static void virtio_blk_save(QEMUFile *f, void *opaque) |
590 |
{ |
591 |
VirtIOBlock *s = opaque; |
592 |
VirtIOBlockReq *req = s->rq; |
593 |
|
594 |
virtio_save(&s->vdev, f); |
595 |
|
596 |
while (req) {
|
597 |
qemu_put_sbyte(f, 1);
|
598 |
qemu_put_buffer(f, (unsigned char*)&req->elem, sizeof(req->elem)); |
599 |
req = req->next; |
600 |
} |
601 |
qemu_put_sbyte(f, 0);
|
602 |
} |
603 |
|
604 |
static int virtio_blk_load(QEMUFile *f, void *opaque, int version_id) |
605 |
{ |
606 |
VirtIOBlock *s = opaque; |
607 |
int ret;
|
608 |
|
609 |
if (version_id != 2) |
610 |
return -EINVAL;
|
611 |
|
612 |
ret = virtio_load(&s->vdev, f); |
613 |
if (ret) {
|
614 |
return ret;
|
615 |
} |
616 |
|
617 |
while (qemu_get_sbyte(f)) {
|
618 |
VirtIOBlockReq *req = virtio_blk_alloc_request(s); |
619 |
qemu_get_buffer(f, (unsigned char*)&req->elem, sizeof(req->elem)); |
620 |
req->next = s->rq; |
621 |
s->rq = req; |
622 |
|
623 |
virtqueue_map_sg(req->elem.in_sg, req->elem.in_addr, |
624 |
req->elem.in_num, 1);
|
625 |
virtqueue_map_sg(req->elem.out_sg, req->elem.out_addr, |
626 |
req->elem.out_num, 0);
|
627 |
} |
628 |
|
629 |
return 0; |
630 |
} |
631 |
|
632 |
static void virtio_blk_resize(void *opaque) |
633 |
{ |
634 |
VirtIOBlock *s = opaque; |
635 |
|
636 |
virtio_notify_config(&s->vdev); |
637 |
} |
638 |
|
639 |
static const BlockDevOps virtio_block_ops = { |
640 |
.resize_cb = virtio_blk_resize, |
641 |
}; |
642 |
|
643 |
VirtIODevice *virtio_blk_init(DeviceState *dev, VirtIOBlkConf *blk) |
644 |
{ |
645 |
VirtIOBlock *s; |
646 |
static int virtio_blk_id; |
647 |
|
648 |
if (!blk->conf.bs) {
|
649 |
error_report("drive property not set");
|
650 |
return NULL; |
651 |
} |
652 |
if (!bdrv_is_inserted(blk->conf.bs)) {
|
653 |
error_report("Device needs media, but drive is empty");
|
654 |
return NULL; |
655 |
} |
656 |
|
657 |
blkconf_serial(&blk->conf, &blk->serial); |
658 |
if (blkconf_geometry(&blk->conf, NULL, 65535, 255, 255) < 0) { |
659 |
return NULL; |
660 |
} |
661 |
|
662 |
s = (VirtIOBlock *)virtio_common_init("virtio-blk", VIRTIO_ID_BLOCK,
|
663 |
sizeof(struct virtio_blk_config), |
664 |
sizeof(VirtIOBlock));
|
665 |
|
666 |
s->vdev.get_config = virtio_blk_update_config; |
667 |
s->vdev.set_config = virtio_blk_set_config; |
668 |
s->vdev.get_features = virtio_blk_get_features; |
669 |
s->vdev.set_status = virtio_blk_set_status; |
670 |
s->vdev.reset = virtio_blk_reset; |
671 |
s->bs = blk->conf.bs; |
672 |
s->conf = &blk->conf; |
673 |
s->blk = blk; |
674 |
s->rq = NULL;
|
675 |
s->sector_mask = (s->conf->logical_block_size / BDRV_SECTOR_SIZE) - 1;
|
676 |
|
677 |
s->vq = virtio_add_queue(&s->vdev, 128, virtio_blk_handle_output);
|
678 |
#ifdef CONFIG_VIRTIO_BLK_DATA_PLANE
|
679 |
if (!virtio_blk_data_plane_create(&s->vdev, blk, &s->dataplane)) {
|
680 |
virtio_cleanup(&s->vdev); |
681 |
return NULL; |
682 |
} |
683 |
#endif
|
684 |
|
685 |
s->change = qemu_add_vm_change_state_handler(virtio_blk_dma_restart_cb, s); |
686 |
s->qdev = dev; |
687 |
register_savevm(dev, "virtio-blk", virtio_blk_id++, 2, |
688 |
virtio_blk_save, virtio_blk_load, s); |
689 |
bdrv_set_dev_ops(s->bs, &virtio_block_ops, s); |
690 |
bdrv_set_buffer_alignment(s->bs, s->conf->logical_block_size); |
691 |
|
692 |
bdrv_iostatus_enable(s->bs); |
693 |
add_boot_device_path(s->conf->bootindex, dev, "/disk@0,0");
|
694 |
|
695 |
return &s->vdev;
|
696 |
} |
697 |
|
698 |
void virtio_blk_exit(VirtIODevice *vdev)
|
699 |
{ |
700 |
VirtIOBlock *s = to_virtio_blk(vdev); |
701 |
|
702 |
#ifdef CONFIG_VIRTIO_BLK_DATA_PLANE
|
703 |
virtio_blk_data_plane_destroy(s->dataplane); |
704 |
s->dataplane = NULL;
|
705 |
#endif
|
706 |
qemu_del_vm_change_state_handler(s->change); |
707 |
unregister_savevm(s->qdev, "virtio-blk", s);
|
708 |
blockdev_mark_auto_del(s->bs); |
709 |
virtio_cleanup(vdev); |
710 |
} |