4 * Copyright IBM, Corp. 2007
7 * Anthony Liguori <aliguori@us.ibm.com>
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
14 #include "qemu/osdep.h"
15 #include "qapi/error.h"
17 #include "qemu/module.h"
18 #include "qemu/error-report.h"
19 #include "qemu/main-loop.h"
21 #include "hw/block/block.h"
22 #include "hw/qdev-properties.h"
23 #include "sysemu/blockdev.h"
24 #include "sysemu/block-ram-registrar.h"
25 #include "sysemu/sysemu.h"
26 #include "sysemu/runstate.h"
27 #include "hw/virtio/virtio-blk.h"
28 #include "dataplane/virtio-blk.h"
29 #include "scsi/constants.h"
33 #include "hw/virtio/virtio-bus.h"
34 #include "migration/qemu-file-types.h"
35 #include "hw/virtio/virtio-access.h"
36 #include "hw/virtio/virtio-blk-common.h"
37 #include "qemu/coroutine.h"
39 static void virtio_blk_init_request(VirtIOBlock
*s
, VirtQueue
*vq
,
50 static void virtio_blk_free_request(VirtIOBlockReq
*req
)
55 static void virtio_blk_req_complete(VirtIOBlockReq
*req
, unsigned char status
)
57 VirtIOBlock
*s
= req
->dev
;
58 VirtIODevice
*vdev
= VIRTIO_DEVICE(s
);
60 trace_virtio_blk_req_complete(vdev
, req
, status
);
62 stb_p(&req
->in
->status
, status
);
63 iov_discard_undo(&req
->inhdr_undo
);
64 iov_discard_undo(&req
->outhdr_undo
);
65 virtqueue_push(req
->vq
, &req
->elem
, req
->in_len
);
66 if (s
->dataplane_started
&& !s
->dataplane_disabled
) {
67 virtio_blk_data_plane_notify(s
->dataplane
, req
->vq
);
69 virtio_notify(vdev
, req
->vq
);
73 static int virtio_blk_handle_rw_error(VirtIOBlockReq
*req
, int error
,
74 bool is_read
, bool acct_failed
)
76 VirtIOBlock
*s
= req
->dev
;
77 BlockErrorAction action
= blk_get_error_action(s
->blk
, is_read
, error
);
79 if (action
== BLOCK_ERROR_ACTION_STOP
) {
80 /* Break the link as the next request is going to be parsed from the
81 * ring again. Otherwise we may end up doing a double completion! */
85 } else if (action
== BLOCK_ERROR_ACTION_REPORT
) {
86 virtio_blk_req_complete(req
, VIRTIO_BLK_S_IOERR
);
88 block_acct_failed(blk_get_stats(s
->blk
), &req
->acct
);
90 virtio_blk_free_request(req
);
93 blk_error_action(s
->blk
, action
, is_read
, error
);
94 return action
!= BLOCK_ERROR_ACTION_IGNORE
;
97 static void virtio_blk_rw_complete(void *opaque
, int ret
)
99 VirtIOBlockReq
*next
= opaque
;
100 VirtIOBlock
*s
= next
->dev
;
101 VirtIODevice
*vdev
= VIRTIO_DEVICE(s
);
103 aio_context_acquire(blk_get_aio_context(s
->conf
.conf
.blk
));
105 VirtIOBlockReq
*req
= next
;
107 trace_virtio_blk_rw_complete(vdev
, req
, ret
);
109 if (req
->qiov
.nalloc
!= -1) {
110 /* If nalloc is != -1 req->qiov is a local copy of the original
111 * external iovec. It was allocated in submit_requests to be
112 * able to merge requests. */
113 qemu_iovec_destroy(&req
->qiov
);
117 int p
= virtio_ldl_p(VIRTIO_DEVICE(s
), &req
->out
.type
);
118 bool is_read
= !(p
& VIRTIO_BLK_T_OUT
);
119 /* Note that memory may be dirtied on read failure. If the
120 * virtio request is not completed here, as is the case for
121 * BLOCK_ERROR_ACTION_STOP, the memory may not be copied
122 * correctly during live migration. While this is ugly,
123 * it is acceptable because the device is free to write to
124 * the memory until the request is completed (which will
125 * happen on the other side of the migration).
127 if (virtio_blk_handle_rw_error(req
, -ret
, is_read
, true)) {
132 virtio_blk_req_complete(req
, VIRTIO_BLK_S_OK
);
133 block_acct_done(blk_get_stats(s
->blk
), &req
->acct
);
134 virtio_blk_free_request(req
);
136 aio_context_release(blk_get_aio_context(s
->conf
.conf
.blk
));
139 static void virtio_blk_flush_complete(void *opaque
, int ret
)
141 VirtIOBlockReq
*req
= opaque
;
142 VirtIOBlock
*s
= req
->dev
;
144 aio_context_acquire(blk_get_aio_context(s
->conf
.conf
.blk
));
146 if (virtio_blk_handle_rw_error(req
, -ret
, 0, true)) {
151 virtio_blk_req_complete(req
, VIRTIO_BLK_S_OK
);
152 block_acct_done(blk_get_stats(s
->blk
), &req
->acct
);
153 virtio_blk_free_request(req
);
156 aio_context_release(blk_get_aio_context(s
->conf
.conf
.blk
));
159 static void virtio_blk_discard_write_zeroes_complete(void *opaque
, int ret
)
161 VirtIOBlockReq
*req
= opaque
;
162 VirtIOBlock
*s
= req
->dev
;
163 bool is_write_zeroes
= (virtio_ldl_p(VIRTIO_DEVICE(s
), &req
->out
.type
) &
164 ~VIRTIO_BLK_T_BARRIER
) == VIRTIO_BLK_T_WRITE_ZEROES
;
166 aio_context_acquire(blk_get_aio_context(s
->conf
.conf
.blk
));
168 if (virtio_blk_handle_rw_error(req
, -ret
, false, is_write_zeroes
)) {
173 virtio_blk_req_complete(req
, VIRTIO_BLK_S_OK
);
174 if (is_write_zeroes
) {
175 block_acct_done(blk_get_stats(s
->blk
), &req
->acct
);
177 virtio_blk_free_request(req
);
180 aio_context_release(blk_get_aio_context(s
->conf
.conf
.blk
));
187 struct sg_io_hdr hdr
;
188 } VirtIOBlockIoctlReq
;
190 static void virtio_blk_ioctl_complete(void *opaque
, int status
)
192 VirtIOBlockIoctlReq
*ioctl_req
= opaque
;
193 VirtIOBlockReq
*req
= ioctl_req
->req
;
194 VirtIOBlock
*s
= req
->dev
;
195 VirtIODevice
*vdev
= VIRTIO_DEVICE(s
);
196 struct virtio_scsi_inhdr
*scsi
;
197 struct sg_io_hdr
*hdr
;
199 scsi
= (void *)req
->elem
.in_sg
[req
->elem
.in_num
- 2].iov_base
;
202 status
= VIRTIO_BLK_S_UNSUPP
;
203 virtio_stl_p(vdev
, &scsi
->errors
, 255);
207 hdr
= &ioctl_req
->hdr
;
209 * From SCSI-Generic-HOWTO: "Some lower level drivers (e.g. ide-scsi)
210 * clear the masked_status field [hence status gets cleared too, see
211 * block/scsi_ioctl.c] even when a CHECK_CONDITION or COMMAND_TERMINATED
212 * status has occurred. However they do set DRIVER_SENSE in driver_status
213 * field. Also a (sb_len_wr > 0) indicates there is a sense buffer.
215 if (hdr
->status
== 0 && hdr
->sb_len_wr
> 0) {
216 hdr
->status
= CHECK_CONDITION
;
219 virtio_stl_p(vdev
, &scsi
->errors
,
220 hdr
->status
| (hdr
->msg_status
<< 8) |
221 (hdr
->host_status
<< 16) | (hdr
->driver_status
<< 24));
222 virtio_stl_p(vdev
, &scsi
->residual
, hdr
->resid
);
223 virtio_stl_p(vdev
, &scsi
->sense_len
, hdr
->sb_len_wr
);
224 virtio_stl_p(vdev
, &scsi
->data_len
, hdr
->dxfer_len
);
227 aio_context_acquire(blk_get_aio_context(s
->conf
.conf
.blk
));
228 virtio_blk_req_complete(req
, status
);
229 virtio_blk_free_request(req
);
230 aio_context_release(blk_get_aio_context(s
->conf
.conf
.blk
));
236 static VirtIOBlockReq
*virtio_blk_get_request(VirtIOBlock
*s
, VirtQueue
*vq
)
238 VirtIOBlockReq
*req
= virtqueue_pop(vq
, sizeof(VirtIOBlockReq
));
241 virtio_blk_init_request(s
, vq
, req
);
246 static int virtio_blk_handle_scsi_req(VirtIOBlockReq
*req
)
248 int status
= VIRTIO_BLK_S_OK
;
249 struct virtio_scsi_inhdr
*scsi
= NULL
;
250 VirtIOBlock
*blk
= req
->dev
;
251 VirtIODevice
*vdev
= VIRTIO_DEVICE(blk
);
252 VirtQueueElement
*elem
= &req
->elem
;
256 VirtIOBlockIoctlReq
*ioctl_req
;
261 * We require at least one output segment each for the virtio_blk_outhdr
262 * and the SCSI command block.
264 * We also at least require the virtio_blk_inhdr, the virtio_scsi_inhdr
265 * and the sense buffer pointer in the input segments.
267 if (elem
->out_num
< 2 || elem
->in_num
< 3) {
268 status
= VIRTIO_BLK_S_IOERR
;
273 * The scsi inhdr is placed in the second-to-last input segment, just
274 * before the regular inhdr.
276 scsi
= (void *)elem
->in_sg
[elem
->in_num
- 2].iov_base
;
278 if (!virtio_has_feature(blk
->host_features
, VIRTIO_BLK_F_SCSI
)) {
279 status
= VIRTIO_BLK_S_UNSUPP
;
284 * No support for bidirection commands yet.
286 if (elem
->out_num
> 2 && elem
->in_num
> 3) {
287 status
= VIRTIO_BLK_S_UNSUPP
;
292 ioctl_req
= g_new0(VirtIOBlockIoctlReq
, 1);
293 ioctl_req
->req
= req
;
294 ioctl_req
->hdr
.interface_id
= 'S';
295 ioctl_req
->hdr
.cmd_len
= elem
->out_sg
[1].iov_len
;
296 ioctl_req
->hdr
.cmdp
= elem
->out_sg
[1].iov_base
;
297 ioctl_req
->hdr
.dxfer_len
= 0;
299 if (elem
->out_num
> 2) {
301 * If there are more than the minimally required 2 output segments
302 * there is write payload starting from the third iovec.
304 ioctl_req
->hdr
.dxfer_direction
= SG_DXFER_TO_DEV
;
305 ioctl_req
->hdr
.iovec_count
= elem
->out_num
- 2;
307 for (i
= 0; i
< ioctl_req
->hdr
.iovec_count
; i
++) {
308 ioctl_req
->hdr
.dxfer_len
+= elem
->out_sg
[i
+ 2].iov_len
;
311 ioctl_req
->hdr
.dxferp
= elem
->out_sg
+ 2;
313 } else if (elem
->in_num
> 3) {
315 * If we have more than 3 input segments the guest wants to actually
318 ioctl_req
->hdr
.dxfer_direction
= SG_DXFER_FROM_DEV
;
319 ioctl_req
->hdr
.iovec_count
= elem
->in_num
- 3;
320 for (i
= 0; i
< ioctl_req
->hdr
.iovec_count
; i
++) {
321 ioctl_req
->hdr
.dxfer_len
+= elem
->in_sg
[i
].iov_len
;
324 ioctl_req
->hdr
.dxferp
= elem
->in_sg
;
327 * Some SCSI commands don't actually transfer any data.
329 ioctl_req
->hdr
.dxfer_direction
= SG_DXFER_NONE
;
332 ioctl_req
->hdr
.sbp
= elem
->in_sg
[elem
->in_num
- 3].iov_base
;
333 ioctl_req
->hdr
.mx_sb_len
= elem
->in_sg
[elem
->in_num
- 3].iov_len
;
335 acb
= blk_aio_ioctl(blk
->blk
, SG_IO
, &ioctl_req
->hdr
,
336 virtio_blk_ioctl_complete
, ioctl_req
);
339 status
= VIRTIO_BLK_S_UNSUPP
;
348 /* Just put anything nonzero so that the ioctl fails in the guest. */
350 virtio_stl_p(vdev
, &scsi
->errors
, 255);
355 static void virtio_blk_handle_scsi(VirtIOBlockReq
*req
)
359 status
= virtio_blk_handle_scsi_req(req
);
360 if (status
!= -EINPROGRESS
) {
361 virtio_blk_req_complete(req
, status
);
362 virtio_blk_free_request(req
);
366 static inline void submit_requests(VirtIOBlock
*s
, MultiReqBuffer
*mrb
,
367 int start
, int num_reqs
, int niov
)
369 BlockBackend
*blk
= s
->blk
;
370 QEMUIOVector
*qiov
= &mrb
->reqs
[start
]->qiov
;
371 int64_t sector_num
= mrb
->reqs
[start
]->sector_num
;
372 bool is_write
= mrb
->is_write
;
373 BdrvRequestFlags flags
= 0;
377 struct iovec
*tmp_iov
= qiov
->iov
;
378 int tmp_niov
= qiov
->niov
;
380 /* mrb->reqs[start]->qiov was initialized from external so we can't
381 * modify it here. We need to initialize it locally and then add the
382 * external iovecs. */
383 qemu_iovec_init(qiov
, niov
);
385 for (i
= 0; i
< tmp_niov
; i
++) {
386 qemu_iovec_add(qiov
, tmp_iov
[i
].iov_base
, tmp_iov
[i
].iov_len
);
389 for (i
= start
+ 1; i
< start
+ num_reqs
; i
++) {
390 qemu_iovec_concat(qiov
, &mrb
->reqs
[i
]->qiov
, 0,
391 mrb
->reqs
[i
]->qiov
.size
);
392 mrb
->reqs
[i
- 1]->mr_next
= mrb
->reqs
[i
];
395 trace_virtio_blk_submit_multireq(VIRTIO_DEVICE(mrb
->reqs
[start
]->dev
),
396 mrb
, start
, num_reqs
,
397 sector_num
<< BDRV_SECTOR_BITS
,
398 qiov
->size
, is_write
);
399 block_acct_merge_done(blk_get_stats(blk
),
400 is_write
? BLOCK_ACCT_WRITE
: BLOCK_ACCT_READ
,
404 if (blk_ram_registrar_ok(&s
->blk_ram_registrar
)) {
405 flags
|= BDRV_REQ_REGISTERED_BUF
;
409 blk_aio_pwritev(blk
, sector_num
<< BDRV_SECTOR_BITS
, qiov
,
410 flags
, virtio_blk_rw_complete
,
413 blk_aio_preadv(blk
, sector_num
<< BDRV_SECTOR_BITS
, qiov
,
414 flags
, virtio_blk_rw_complete
,
419 static int multireq_compare(const void *a
, const void *b
)
421 const VirtIOBlockReq
*req1
= *(VirtIOBlockReq
**)a
,
422 *req2
= *(VirtIOBlockReq
**)b
;
425 * Note that we can't simply subtract sector_num1 from sector_num2
426 * here as that could overflow the return value.
428 if (req1
->sector_num
> req2
->sector_num
) {
430 } else if (req1
->sector_num
< req2
->sector_num
) {
437 static void virtio_blk_submit_multireq(VirtIOBlock
*s
, MultiReqBuffer
*mrb
)
439 int i
= 0, start
= 0, num_reqs
= 0, niov
= 0, nb_sectors
= 0;
440 uint32_t max_transfer
;
441 int64_t sector_num
= 0;
443 if (mrb
->num_reqs
== 1) {
444 submit_requests(s
, mrb
, 0, 1, -1);
449 max_transfer
= blk_get_max_transfer(mrb
->reqs
[0]->dev
->blk
);
451 qsort(mrb
->reqs
, mrb
->num_reqs
, sizeof(*mrb
->reqs
),
454 for (i
= 0; i
< mrb
->num_reqs
; i
++) {
455 VirtIOBlockReq
*req
= mrb
->reqs
[i
];
458 * NOTE: We cannot merge the requests in below situations:
459 * 1. requests are not sequential
460 * 2. merge would exceed maximum number of IOVs
461 * 3. merge would exceed maximum transfer length of backend device
463 if (sector_num
+ nb_sectors
!= req
->sector_num
||
464 niov
> blk_get_max_iov(s
->blk
) - req
->qiov
.niov
||
465 req
->qiov
.size
> max_transfer
||
466 nb_sectors
> (max_transfer
-
467 req
->qiov
.size
) / BDRV_SECTOR_SIZE
) {
468 submit_requests(s
, mrb
, start
, num_reqs
, niov
);
474 sector_num
= req
->sector_num
;
475 nb_sectors
= niov
= 0;
479 nb_sectors
+= req
->qiov
.size
/ BDRV_SECTOR_SIZE
;
480 niov
+= req
->qiov
.niov
;
484 submit_requests(s
, mrb
, start
, num_reqs
, niov
);
488 static void virtio_blk_handle_flush(VirtIOBlockReq
*req
, MultiReqBuffer
*mrb
)
490 VirtIOBlock
*s
= req
->dev
;
492 block_acct_start(blk_get_stats(s
->blk
), &req
->acct
, 0,
496 * Make sure all outstanding writes are posted to the backing device.
498 if (mrb
->is_write
&& mrb
->num_reqs
> 0) {
499 virtio_blk_submit_multireq(s
, mrb
);
501 blk_aio_flush(s
->blk
, virtio_blk_flush_complete
, req
);
504 static bool virtio_blk_sect_range_ok(VirtIOBlock
*dev
,
505 uint64_t sector
, size_t size
)
507 uint64_t nb_sectors
= size
>> BDRV_SECTOR_BITS
;
508 uint64_t total_sectors
;
510 if (nb_sectors
> BDRV_REQUEST_MAX_SECTORS
) {
513 if (sector
& dev
->sector_mask
) {
516 if (size
% dev
->conf
.conf
.logical_block_size
) {
519 blk_get_geometry(dev
->blk
, &total_sectors
);
520 if (sector
> total_sectors
|| nb_sectors
> total_sectors
- sector
) {
526 static uint8_t virtio_blk_handle_discard_write_zeroes(VirtIOBlockReq
*req
,
527 struct virtio_blk_discard_write_zeroes
*dwz_hdr
, bool is_write_zeroes
)
529 VirtIOBlock
*s
= req
->dev
;
530 VirtIODevice
*vdev
= VIRTIO_DEVICE(s
);
532 uint32_t num_sectors
, flags
, max_sectors
;
536 sector
= virtio_ldq_p(vdev
, &dwz_hdr
->sector
);
537 num_sectors
= virtio_ldl_p(vdev
, &dwz_hdr
->num_sectors
);
538 flags
= virtio_ldl_p(vdev
, &dwz_hdr
->flags
);
539 max_sectors
= is_write_zeroes
? s
->conf
.max_write_zeroes_sectors
:
540 s
->conf
.max_discard_sectors
;
543 * max_sectors is at most BDRV_REQUEST_MAX_SECTORS, this check
544 * make us sure that "num_sectors << BDRV_SECTOR_BITS" can fit in
545 * the integer variable.
547 if (unlikely(num_sectors
> max_sectors
)) {
548 err_status
= VIRTIO_BLK_S_IOERR
;
552 bytes
= num_sectors
<< BDRV_SECTOR_BITS
;
554 if (unlikely(!virtio_blk_sect_range_ok(s
, sector
, bytes
))) {
555 err_status
= VIRTIO_BLK_S_IOERR
;
560 * The device MUST set the status byte to VIRTIO_BLK_S_UNSUPP for discard
561 * and write zeroes commands if any unknown flag is set.
563 if (unlikely(flags
& ~VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP
)) {
564 err_status
= VIRTIO_BLK_S_UNSUPP
;
568 if (is_write_zeroes
) { /* VIRTIO_BLK_T_WRITE_ZEROES */
569 int blk_aio_flags
= 0;
571 if (flags
& VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP
) {
572 blk_aio_flags
|= BDRV_REQ_MAY_UNMAP
;
575 block_acct_start(blk_get_stats(s
->blk
), &req
->acct
, bytes
,
578 blk_aio_pwrite_zeroes(s
->blk
, sector
<< BDRV_SECTOR_BITS
,
579 bytes
, blk_aio_flags
,
580 virtio_blk_discard_write_zeroes_complete
, req
);
581 } else { /* VIRTIO_BLK_T_DISCARD */
583 * The device MUST set the status byte to VIRTIO_BLK_S_UNSUPP for
584 * discard commands if the unmap flag is set.
586 if (unlikely(flags
& VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP
)) {
587 err_status
= VIRTIO_BLK_S_UNSUPP
;
591 blk_aio_pdiscard(s
->blk
, sector
<< BDRV_SECTOR_BITS
, bytes
,
592 virtio_blk_discard_write_zeroes_complete
, req
);
595 return VIRTIO_BLK_S_OK
;
598 if (is_write_zeroes
) {
599 block_acct_invalid(blk_get_stats(s
->blk
), BLOCK_ACCT_WRITE
);
604 static int virtio_blk_handle_request(VirtIOBlockReq
*req
, MultiReqBuffer
*mrb
)
607 struct iovec
*in_iov
= req
->elem
.in_sg
;
608 struct iovec
*out_iov
= req
->elem
.out_sg
;
609 unsigned in_num
= req
->elem
.in_num
;
610 unsigned out_num
= req
->elem
.out_num
;
611 VirtIOBlock
*s
= req
->dev
;
612 VirtIODevice
*vdev
= VIRTIO_DEVICE(s
);
614 if (req
->elem
.out_num
< 1 || req
->elem
.in_num
< 1) {
615 virtio_error(vdev
, "virtio-blk missing headers");
619 if (unlikely(iov_to_buf(out_iov
, out_num
, 0, &req
->out
,
620 sizeof(req
->out
)) != sizeof(req
->out
))) {
621 virtio_error(vdev
, "virtio-blk request outhdr too short");
625 iov_discard_front_undoable(&out_iov
, &out_num
, sizeof(req
->out
),
628 if (in_iov
[in_num
- 1].iov_len
< sizeof(struct virtio_blk_inhdr
)) {
629 virtio_error(vdev
, "virtio-blk request inhdr too short");
630 iov_discard_undo(&req
->outhdr_undo
);
634 /* We always touch the last byte, so just see how big in_iov is. */
635 req
->in_len
= iov_size(in_iov
, in_num
);
636 req
->in
= (void *)in_iov
[in_num
- 1].iov_base
637 + in_iov
[in_num
- 1].iov_len
638 - sizeof(struct virtio_blk_inhdr
);
639 iov_discard_back_undoable(in_iov
, &in_num
, sizeof(struct virtio_blk_inhdr
),
642 type
= virtio_ldl_p(vdev
, &req
->out
.type
);
644 /* VIRTIO_BLK_T_OUT defines the command direction. VIRTIO_BLK_T_BARRIER
645 * is an optional flag. Although a guest should not send this flag if
646 * not negotiated we ignored it in the past. So keep ignoring it. */
647 switch (type
& ~(VIRTIO_BLK_T_OUT
| VIRTIO_BLK_T_BARRIER
)) {
648 case VIRTIO_BLK_T_IN
:
650 bool is_write
= type
& VIRTIO_BLK_T_OUT
;
651 req
->sector_num
= virtio_ldq_p(vdev
, &req
->out
.sector
);
654 qemu_iovec_init_external(&req
->qiov
, out_iov
, out_num
);
655 trace_virtio_blk_handle_write(vdev
, req
, req
->sector_num
,
656 req
->qiov
.size
/ BDRV_SECTOR_SIZE
);
658 qemu_iovec_init_external(&req
->qiov
, in_iov
, in_num
);
659 trace_virtio_blk_handle_read(vdev
, req
, req
->sector_num
,
660 req
->qiov
.size
/ BDRV_SECTOR_SIZE
);
663 if (!virtio_blk_sect_range_ok(s
, req
->sector_num
, req
->qiov
.size
)) {
664 virtio_blk_req_complete(req
, VIRTIO_BLK_S_IOERR
);
665 block_acct_invalid(blk_get_stats(s
->blk
),
666 is_write
? BLOCK_ACCT_WRITE
: BLOCK_ACCT_READ
);
667 virtio_blk_free_request(req
);
671 block_acct_start(blk_get_stats(s
->blk
), &req
->acct
, req
->qiov
.size
,
672 is_write
? BLOCK_ACCT_WRITE
: BLOCK_ACCT_READ
);
674 /* merge would exceed maximum number of requests or IO direction
676 if (mrb
->num_reqs
> 0 && (mrb
->num_reqs
== VIRTIO_BLK_MAX_MERGE_REQS
||
677 is_write
!= mrb
->is_write
||
678 !s
->conf
.request_merging
)) {
679 virtio_blk_submit_multireq(s
, mrb
);
682 assert(mrb
->num_reqs
< VIRTIO_BLK_MAX_MERGE_REQS
);
683 mrb
->reqs
[mrb
->num_reqs
++] = req
;
684 mrb
->is_write
= is_write
;
687 case VIRTIO_BLK_T_FLUSH
:
688 virtio_blk_handle_flush(req
, mrb
);
690 case VIRTIO_BLK_T_SCSI_CMD
:
691 virtio_blk_handle_scsi(req
);
693 case VIRTIO_BLK_T_GET_ID
:
696 * NB: per existing s/n string convention the string is
697 * terminated by '\0' only when shorter than buffer.
699 const char *serial
= s
->conf
.serial
? s
->conf
.serial
: "";
700 size_t size
= MIN(strlen(serial
) + 1,
701 MIN(iov_size(in_iov
, in_num
),
702 VIRTIO_BLK_ID_BYTES
));
703 iov_from_buf(in_iov
, in_num
, 0, serial
, size
);
704 virtio_blk_req_complete(req
, VIRTIO_BLK_S_OK
);
705 virtio_blk_free_request(req
);
709 * VIRTIO_BLK_T_DISCARD and VIRTIO_BLK_T_WRITE_ZEROES are defined with
710 * VIRTIO_BLK_T_OUT flag set. We masked this flag in the switch statement,
711 * so we must mask it for these requests, then we will check if it is set.
713 case VIRTIO_BLK_T_DISCARD
& ~VIRTIO_BLK_T_OUT
:
714 case VIRTIO_BLK_T_WRITE_ZEROES
& ~VIRTIO_BLK_T_OUT
:
716 struct virtio_blk_discard_write_zeroes dwz_hdr
;
717 size_t out_len
= iov_size(out_iov
, out_num
);
718 bool is_write_zeroes
= (type
& ~VIRTIO_BLK_T_BARRIER
) ==
719 VIRTIO_BLK_T_WRITE_ZEROES
;
723 * Unsupported if VIRTIO_BLK_T_OUT is not set or the request contains
724 * more than one segment.
726 if (unlikely(!(type
& VIRTIO_BLK_T_OUT
) ||
727 out_len
> sizeof(dwz_hdr
))) {
728 virtio_blk_req_complete(req
, VIRTIO_BLK_S_UNSUPP
);
729 virtio_blk_free_request(req
);
733 if (unlikely(iov_to_buf(out_iov
, out_num
, 0, &dwz_hdr
,
734 sizeof(dwz_hdr
)) != sizeof(dwz_hdr
))) {
735 iov_discard_undo(&req
->inhdr_undo
);
736 iov_discard_undo(&req
->outhdr_undo
);
737 virtio_error(vdev
, "virtio-blk discard/write_zeroes header"
742 err_status
= virtio_blk_handle_discard_write_zeroes(req
, &dwz_hdr
,
744 if (err_status
!= VIRTIO_BLK_S_OK
) {
745 virtio_blk_req_complete(req
, err_status
);
746 virtio_blk_free_request(req
);
752 virtio_blk_req_complete(req
, VIRTIO_BLK_S_UNSUPP
);
753 virtio_blk_free_request(req
);
758 void virtio_blk_handle_vq(VirtIOBlock
*s
, VirtQueue
*vq
)
761 MultiReqBuffer mrb
= {};
762 bool suppress_notifications
= virtio_queue_get_notification(vq
);
764 aio_context_acquire(blk_get_aio_context(s
->blk
));
768 if (suppress_notifications
) {
769 virtio_queue_set_notification(vq
, 0);
772 while ((req
= virtio_blk_get_request(s
, vq
))) {
773 if (virtio_blk_handle_request(req
, &mrb
)) {
774 virtqueue_detach_element(req
->vq
, &req
->elem
, 0);
775 virtio_blk_free_request(req
);
780 if (suppress_notifications
) {
781 virtio_queue_set_notification(vq
, 1);
783 } while (!virtio_queue_empty(vq
));
786 virtio_blk_submit_multireq(s
, &mrb
);
789 blk_io_unplug(s
->blk
);
790 aio_context_release(blk_get_aio_context(s
->blk
));
793 static void virtio_blk_handle_output(VirtIODevice
*vdev
, VirtQueue
*vq
)
795 VirtIOBlock
*s
= (VirtIOBlock
*)vdev
;
797 if (s
->dataplane
&& !s
->dataplane_started
) {
798 /* Some guests kick before setting VIRTIO_CONFIG_S_DRIVER_OK so start
799 * dataplane here instead of waiting for .set_status().
801 virtio_device_start_ioeventfd(vdev
);
802 if (!s
->dataplane_disabled
) {
806 virtio_blk_handle_vq(s
, vq
);
809 void virtio_blk_process_queued_requests(VirtIOBlock
*s
, bool is_bh
)
811 VirtIOBlockReq
*req
= s
->rq
;
812 MultiReqBuffer mrb
= {};
816 aio_context_acquire(blk_get_aio_context(s
->conf
.conf
.blk
));
818 VirtIOBlockReq
*next
= req
->next
;
819 if (virtio_blk_handle_request(req
, &mrb
)) {
820 /* Device is now broken and won't do any processing until it gets
821 * reset. Already queued requests will be lost: let's purge them.
825 virtqueue_detach_element(req
->vq
, &req
->elem
, 0);
826 virtio_blk_free_request(req
);
835 virtio_blk_submit_multireq(s
, &mrb
);
838 blk_dec_in_flight(s
->conf
.conf
.blk
);
840 aio_context_release(blk_get_aio_context(s
->conf
.conf
.blk
));
843 static void virtio_blk_dma_restart_bh(void *opaque
)
845 VirtIOBlock
*s
= opaque
;
847 qemu_bh_delete(s
->bh
);
850 virtio_blk_process_queued_requests(s
, true);
853 static void virtio_blk_dma_restart_cb(void *opaque
, bool running
,
856 VirtIOBlock
*s
= opaque
;
857 BusState
*qbus
= BUS(qdev_get_parent_bus(DEVICE(s
)));
858 VirtioBusState
*bus
= VIRTIO_BUS(qbus
);
865 * If ioeventfd is enabled, don't schedule the BH here as queued
866 * requests will be processed while starting the data plane.
868 if (!s
->bh
&& !virtio_bus_ioeventfd_enabled(bus
)) {
869 s
->bh
= aio_bh_new(blk_get_aio_context(s
->conf
.conf
.blk
),
870 virtio_blk_dma_restart_bh
, s
);
871 blk_inc_in_flight(s
->conf
.conf
.blk
);
872 qemu_bh_schedule(s
->bh
);
876 static void virtio_blk_reset(VirtIODevice
*vdev
)
878 VirtIOBlock
*s
= VIRTIO_BLK(vdev
);
882 ctx
= blk_get_aio_context(s
->blk
);
883 aio_context_acquire(ctx
);
886 /* We drop queued requests after blk_drain() because blk_drain() itself can
891 virtqueue_detach_element(req
->vq
, &req
->elem
, 0);
892 virtio_blk_free_request(req
);
895 aio_context_release(ctx
);
897 assert(!s
->dataplane_started
);
898 blk_set_enable_write_cache(s
->blk
, s
->original_wce
);
901 /* coalesce internal state, copy to pci i/o region 0
903 static void virtio_blk_update_config(VirtIODevice
*vdev
, uint8_t *config
)
905 VirtIOBlock
*s
= VIRTIO_BLK(vdev
);
906 BlockConf
*conf
= &s
->conf
.conf
;
907 struct virtio_blk_config blkcfg
;
910 int blk_size
= conf
->logical_block_size
;
912 blk_get_geometry(s
->blk
, &capacity
);
913 memset(&blkcfg
, 0, sizeof(blkcfg
));
914 virtio_stq_p(vdev
, &blkcfg
.capacity
, capacity
);
915 virtio_stl_p(vdev
, &blkcfg
.seg_max
,
916 s
->conf
.seg_max_adjust
? s
->conf
.queue_size
- 2 : 128 - 2);
917 virtio_stw_p(vdev
, &blkcfg
.geometry
.cylinders
, conf
->cyls
);
918 virtio_stl_p(vdev
, &blkcfg
.blk_size
, blk_size
);
919 virtio_stw_p(vdev
, &blkcfg
.min_io_size
, conf
->min_io_size
/ blk_size
);
920 virtio_stl_p(vdev
, &blkcfg
.opt_io_size
, conf
->opt_io_size
/ blk_size
);
921 blkcfg
.geometry
.heads
= conf
->heads
;
923 * We must ensure that the block device capacity is a multiple of
924 * the logical block size. If that is not the case, let's use
925 * sector_mask to adopt the geometry to have a correct picture.
926 * For those devices where the capacity is ok for the given geometry
927 * we don't touch the sector value of the geometry, since some devices
928 * (like s390 dasd) need a specific value. Here the capacity is already
929 * cyls*heads*secs*blk_size and the sector value is not block size
930 * divided by 512 - instead it is the amount of blk_size blocks
931 * per track (cylinder).
933 length
= blk_getlength(s
->blk
);
934 if (length
> 0 && length
/ conf
->heads
/ conf
->secs
% blk_size
) {
935 blkcfg
.geometry
.sectors
= conf
->secs
& ~s
->sector_mask
;
937 blkcfg
.geometry
.sectors
= conf
->secs
;
940 blkcfg
.physical_block_exp
= get_physical_block_exp(conf
);
941 blkcfg
.alignment_offset
= 0;
942 blkcfg
.wce
= blk_enable_write_cache(s
->blk
);
943 virtio_stw_p(vdev
, &blkcfg
.num_queues
, s
->conf
.num_queues
);
944 if (virtio_has_feature(s
->host_features
, VIRTIO_BLK_F_DISCARD
)) {
945 uint32_t discard_granularity
= conf
->discard_granularity
;
946 if (discard_granularity
== -1 || !s
->conf
.report_discard_granularity
) {
947 discard_granularity
= blk_size
;
949 virtio_stl_p(vdev
, &blkcfg
.max_discard_sectors
,
950 s
->conf
.max_discard_sectors
);
951 virtio_stl_p(vdev
, &blkcfg
.discard_sector_alignment
,
952 discard_granularity
>> BDRV_SECTOR_BITS
);
954 * We support only one segment per request since multiple segments
955 * are not widely used and there are no userspace APIs that allow
956 * applications to submit multiple segments in a single call.
958 virtio_stl_p(vdev
, &blkcfg
.max_discard_seg
, 1);
960 if (virtio_has_feature(s
->host_features
, VIRTIO_BLK_F_WRITE_ZEROES
)) {
961 virtio_stl_p(vdev
, &blkcfg
.max_write_zeroes_sectors
,
962 s
->conf
.max_write_zeroes_sectors
);
963 blkcfg
.write_zeroes_may_unmap
= 1;
964 virtio_stl_p(vdev
, &blkcfg
.max_write_zeroes_seg
, 1);
966 memcpy(config
, &blkcfg
, s
->config_size
);
969 static void virtio_blk_set_config(VirtIODevice
*vdev
, const uint8_t *config
)
971 VirtIOBlock
*s
= VIRTIO_BLK(vdev
);
972 struct virtio_blk_config blkcfg
;
974 memcpy(&blkcfg
, config
, s
->config_size
);
976 aio_context_acquire(blk_get_aio_context(s
->blk
));
977 blk_set_enable_write_cache(s
->blk
, blkcfg
.wce
!= 0);
978 aio_context_release(blk_get_aio_context(s
->blk
));
981 static uint64_t virtio_blk_get_features(VirtIODevice
*vdev
, uint64_t features
,
984 VirtIOBlock
*s
= VIRTIO_BLK(vdev
);
986 /* Firstly sync all virtio-blk possible supported features */
987 features
|= s
->host_features
;
989 virtio_add_feature(&features
, VIRTIO_BLK_F_SEG_MAX
);
990 virtio_add_feature(&features
, VIRTIO_BLK_F_GEOMETRY
);
991 virtio_add_feature(&features
, VIRTIO_BLK_F_TOPOLOGY
);
992 virtio_add_feature(&features
, VIRTIO_BLK_F_BLK_SIZE
);
993 if (virtio_has_feature(features
, VIRTIO_F_VERSION_1
)) {
994 if (virtio_has_feature(s
->host_features
, VIRTIO_BLK_F_SCSI
)) {
995 error_setg(errp
, "Please set scsi=off for virtio-blk devices in order to use virtio 1.0");
999 virtio_clear_feature(&features
, VIRTIO_F_ANY_LAYOUT
);
1000 virtio_add_feature(&features
, VIRTIO_BLK_F_SCSI
);
1003 if (blk_enable_write_cache(s
->blk
) ||
1004 (s
->conf
.x_enable_wce_if_config_wce
&&
1005 virtio_has_feature(features
, VIRTIO_BLK_F_CONFIG_WCE
))) {
1006 virtio_add_feature(&features
, VIRTIO_BLK_F_WCE
);
1008 if (!blk_is_writable(s
->blk
)) {
1009 virtio_add_feature(&features
, VIRTIO_BLK_F_RO
);
1011 if (s
->conf
.num_queues
> 1) {
1012 virtio_add_feature(&features
, VIRTIO_BLK_F_MQ
);
1018 static void virtio_blk_set_status(VirtIODevice
*vdev
, uint8_t status
)
1020 VirtIOBlock
*s
= VIRTIO_BLK(vdev
);
1022 if (!(status
& (VIRTIO_CONFIG_S_DRIVER
| VIRTIO_CONFIG_S_DRIVER_OK
))) {
1023 assert(!s
->dataplane_started
);
1026 if (!(status
& VIRTIO_CONFIG_S_DRIVER_OK
)) {
1030 /* A guest that supports VIRTIO_BLK_F_CONFIG_WCE must be able to send
1031 * cache flushes. Thus, the "auto writethrough" behavior is never
1032 * necessary for guests that support the VIRTIO_BLK_F_CONFIG_WCE feature.
1033 * Leaving it enabled would break the following sequence:
1035 * Guest started with "-drive cache=writethrough"
1036 * Guest sets status to 0
1037 * Guest sets DRIVER bit in status field
1038 * Guest reads host features (WCE=0, CONFIG_WCE=1)
1039 * Guest writes guest features (WCE=0, CONFIG_WCE=1)
1040 * Guest writes 1 to the WCE configuration field (writeback mode)
1041 * Guest sets DRIVER_OK bit in status field
1043 * s->blk would erroneously be placed in writethrough mode.
1045 if (!virtio_vdev_has_feature(vdev
, VIRTIO_BLK_F_CONFIG_WCE
)) {
1046 aio_context_acquire(blk_get_aio_context(s
->blk
));
1047 blk_set_enable_write_cache(s
->blk
,
1048 virtio_vdev_has_feature(vdev
,
1050 aio_context_release(blk_get_aio_context(s
->blk
));
1054 static void virtio_blk_save_device(VirtIODevice
*vdev
, QEMUFile
*f
)
1056 VirtIOBlock
*s
= VIRTIO_BLK(vdev
);
1057 VirtIOBlockReq
*req
= s
->rq
;
1060 qemu_put_sbyte(f
, 1);
1062 if (s
->conf
.num_queues
> 1) {
1063 qemu_put_be32(f
, virtio_get_queue_index(req
->vq
));
1066 qemu_put_virtqueue_element(vdev
, f
, &req
->elem
);
1069 qemu_put_sbyte(f
, 0);
1072 static int virtio_blk_load_device(VirtIODevice
*vdev
, QEMUFile
*f
,
1075 VirtIOBlock
*s
= VIRTIO_BLK(vdev
);
1077 while (qemu_get_sbyte(f
)) {
1078 unsigned nvqs
= s
->conf
.num_queues
;
1079 unsigned vq_idx
= 0;
1080 VirtIOBlockReq
*req
;
1083 vq_idx
= qemu_get_be32(f
);
1085 if (vq_idx
>= nvqs
) {
1086 error_report("Invalid virtqueue index in request list: %#x",
1092 req
= qemu_get_virtqueue_element(vdev
, f
, sizeof(VirtIOBlockReq
));
1093 virtio_blk_init_request(s
, virtio_get_queue(vdev
, vq_idx
), req
);
1101 static void virtio_resize_cb(void *opaque
)
1103 VirtIODevice
*vdev
= opaque
;
1105 assert(qemu_get_current_aio_context() == qemu_get_aio_context());
1106 virtio_notify_config(vdev
);
1109 static void virtio_blk_resize(void *opaque
)
1111 VirtIODevice
*vdev
= VIRTIO_DEVICE(opaque
);
1114 * virtio_notify_config() needs to acquire the global mutex,
1115 * so it can't be called from an iothread. Instead, schedule
1116 * it to be run in the main context BH.
1118 aio_bh_schedule_oneshot(qemu_get_aio_context(), virtio_resize_cb
, vdev
);
1121 static const BlockDevOps virtio_block_ops
= {
1122 .resize_cb
= virtio_blk_resize
,
1125 static void virtio_blk_device_realize(DeviceState
*dev
, Error
**errp
)
1127 VirtIODevice
*vdev
= VIRTIO_DEVICE(dev
);
1128 VirtIOBlock
*s
= VIRTIO_BLK(dev
);
1129 VirtIOBlkConf
*conf
= &s
->conf
;
1133 if (!conf
->conf
.blk
) {
1134 error_setg(errp
, "drive property not set");
1137 if (!blk_is_inserted(conf
->conf
.blk
)) {
1138 error_setg(errp
, "Device needs media, but drive is empty");
1141 if (conf
->num_queues
== VIRTIO_BLK_AUTO_NUM_QUEUES
) {
1142 conf
->num_queues
= 1;
1144 if (!conf
->num_queues
) {
1145 error_setg(errp
, "num-queues property must be larger than 0");
1148 if (conf
->queue_size
<= 2) {
1149 error_setg(errp
, "invalid queue-size property (%" PRIu16
"), "
1150 "must be > 2", conf
->queue_size
);
1153 if (!is_power_of_2(conf
->queue_size
) ||
1154 conf
->queue_size
> VIRTQUEUE_MAX_SIZE
) {
1155 error_setg(errp
, "invalid queue-size property (%" PRIu16
"), "
1156 "must be a power of 2 (max %d)",
1157 conf
->queue_size
, VIRTQUEUE_MAX_SIZE
);
1161 if (!blkconf_apply_backend_options(&conf
->conf
,
1162 !blk_supports_write_perm(conf
->conf
.blk
),
1166 s
->original_wce
= blk_enable_write_cache(conf
->conf
.blk
);
1167 if (!blkconf_geometry(&conf
->conf
, NULL
, 65535, 255, 255, errp
)) {
1171 if (!blkconf_blocksizes(&conf
->conf
, errp
)) {
1175 if (virtio_has_feature(s
->host_features
, VIRTIO_BLK_F_DISCARD
) &&
1176 (!conf
->max_discard_sectors
||
1177 conf
->max_discard_sectors
> BDRV_REQUEST_MAX_SECTORS
)) {
1178 error_setg(errp
, "invalid max-discard-sectors property (%" PRIu32
")"
1179 ", must be between 1 and %d",
1180 conf
->max_discard_sectors
, (int)BDRV_REQUEST_MAX_SECTORS
);
1184 if (virtio_has_feature(s
->host_features
, VIRTIO_BLK_F_WRITE_ZEROES
) &&
1185 (!conf
->max_write_zeroes_sectors
||
1186 conf
->max_write_zeroes_sectors
> BDRV_REQUEST_MAX_SECTORS
)) {
1187 error_setg(errp
, "invalid max-write-zeroes-sectors property (%" PRIu32
1188 "), must be between 1 and %d",
1189 conf
->max_write_zeroes_sectors
,
1190 (int)BDRV_REQUEST_MAX_SECTORS
);
1194 s
->config_size
= virtio_get_config_size(&virtio_blk_cfg_size_params
,
1196 virtio_init(vdev
, VIRTIO_ID_BLOCK
, s
->config_size
);
1198 s
->blk
= conf
->conf
.blk
;
1200 s
->sector_mask
= (s
->conf
.conf
.logical_block_size
/ BDRV_SECTOR_SIZE
) - 1;
1202 for (i
= 0; i
< conf
->num_queues
; i
++) {
1203 virtio_add_queue(vdev
, conf
->queue_size
, virtio_blk_handle_output
);
1205 qemu_coroutine_inc_pool_size(conf
->num_queues
* conf
->queue_size
/ 2);
1206 virtio_blk_data_plane_create(vdev
, conf
, &s
->dataplane
, &err
);
1208 error_propagate(errp
, err
);
1209 for (i
= 0; i
< conf
->num_queues
; i
++) {
1210 virtio_del_queue(vdev
, i
);
1212 virtio_cleanup(vdev
);
1216 s
->change
= qemu_add_vm_change_state_handler(virtio_blk_dma_restart_cb
, s
);
1217 blk_ram_registrar_init(&s
->blk_ram_registrar
, s
->blk
);
1218 blk_set_dev_ops(s
->blk
, &virtio_block_ops
, s
);
1220 blk_iostatus_enable(s
->blk
);
1222 add_boot_device_lchs(dev
, "/disk@0,0",
1228 static void virtio_blk_device_unrealize(DeviceState
*dev
)
1230 VirtIODevice
*vdev
= VIRTIO_DEVICE(dev
);
1231 VirtIOBlock
*s
= VIRTIO_BLK(dev
);
1232 VirtIOBlkConf
*conf
= &s
->conf
;
1236 del_boot_device_lchs(dev
, "/disk@0,0");
1237 virtio_blk_data_plane_destroy(s
->dataplane
);
1238 s
->dataplane
= NULL
;
1239 for (i
= 0; i
< conf
->num_queues
; i
++) {
1240 virtio_del_queue(vdev
, i
);
1242 qemu_coroutine_dec_pool_size(conf
->num_queues
* conf
->queue_size
/ 2);
1243 blk_ram_registrar_destroy(&s
->blk_ram_registrar
);
1244 qemu_del_vm_change_state_handler(s
->change
);
1245 blockdev_mark_auto_del(s
->blk
);
1246 virtio_cleanup(vdev
);
1249 static void virtio_blk_instance_init(Object
*obj
)
1251 VirtIOBlock
*s
= VIRTIO_BLK(obj
);
1253 device_add_bootindex_property(obj
, &s
->conf
.conf
.bootindex
,
1254 "bootindex", "/disk@0,0",
1258 static const VMStateDescription vmstate_virtio_blk
= {
1259 .name
= "virtio-blk",
1260 .minimum_version_id
= 2,
1262 .fields
= (VMStateField
[]) {
1263 VMSTATE_VIRTIO_DEVICE
,
1264 VMSTATE_END_OF_LIST()
1268 static Property virtio_blk_properties
[] = {
1269 DEFINE_BLOCK_PROPERTIES(VirtIOBlock
, conf
.conf
),
1270 DEFINE_BLOCK_ERROR_PROPERTIES(VirtIOBlock
, conf
.conf
),
1271 DEFINE_BLOCK_CHS_PROPERTIES(VirtIOBlock
, conf
.conf
),
1272 DEFINE_PROP_STRING("serial", VirtIOBlock
, conf
.serial
),
1273 DEFINE_PROP_BIT64("config-wce", VirtIOBlock
, host_features
,
1274 VIRTIO_BLK_F_CONFIG_WCE
, true),
1276 DEFINE_PROP_BIT64("scsi", VirtIOBlock
, host_features
,
1277 VIRTIO_BLK_F_SCSI
, false),
1279 DEFINE_PROP_BIT("request-merging", VirtIOBlock
, conf
.request_merging
, 0,
1281 DEFINE_PROP_UINT16("num-queues", VirtIOBlock
, conf
.num_queues
,
1282 VIRTIO_BLK_AUTO_NUM_QUEUES
),
1283 DEFINE_PROP_UINT16("queue-size", VirtIOBlock
, conf
.queue_size
, 256),
1284 DEFINE_PROP_BOOL("seg-max-adjust", VirtIOBlock
, conf
.seg_max_adjust
, true),
1285 DEFINE_PROP_LINK("iothread", VirtIOBlock
, conf
.iothread
, TYPE_IOTHREAD
,
1287 DEFINE_PROP_BIT64("discard", VirtIOBlock
, host_features
,
1288 VIRTIO_BLK_F_DISCARD
, true),
1289 DEFINE_PROP_BOOL("report-discard-granularity", VirtIOBlock
,
1290 conf
.report_discard_granularity
, true),
1291 DEFINE_PROP_BIT64("write-zeroes", VirtIOBlock
, host_features
,
1292 VIRTIO_BLK_F_WRITE_ZEROES
, true),
1293 DEFINE_PROP_UINT32("max-discard-sectors", VirtIOBlock
,
1294 conf
.max_discard_sectors
, BDRV_REQUEST_MAX_SECTORS
),
1295 DEFINE_PROP_UINT32("max-write-zeroes-sectors", VirtIOBlock
,
1296 conf
.max_write_zeroes_sectors
, BDRV_REQUEST_MAX_SECTORS
),
1297 DEFINE_PROP_BOOL("x-enable-wce-if-config-wce", VirtIOBlock
,
1298 conf
.x_enable_wce_if_config_wce
, true),
1299 DEFINE_PROP_END_OF_LIST(),
1302 static void virtio_blk_class_init(ObjectClass
*klass
, void *data
)
1304 DeviceClass
*dc
= DEVICE_CLASS(klass
);
1305 VirtioDeviceClass
*vdc
= VIRTIO_DEVICE_CLASS(klass
);
1307 device_class_set_props(dc
, virtio_blk_properties
);
1308 dc
->vmsd
= &vmstate_virtio_blk
;
1309 set_bit(DEVICE_CATEGORY_STORAGE
, dc
->categories
);
1310 vdc
->realize
= virtio_blk_device_realize
;
1311 vdc
->unrealize
= virtio_blk_device_unrealize
;
1312 vdc
->get_config
= virtio_blk_update_config
;
1313 vdc
->set_config
= virtio_blk_set_config
;
1314 vdc
->get_features
= virtio_blk_get_features
;
1315 vdc
->set_status
= virtio_blk_set_status
;
1316 vdc
->reset
= virtio_blk_reset
;
1317 vdc
->save
= virtio_blk_save_device
;
1318 vdc
->load
= virtio_blk_load_device
;
1319 vdc
->start_ioeventfd
= virtio_blk_data_plane_start
;
1320 vdc
->stop_ioeventfd
= virtio_blk_data_plane_stop
;
1323 static const TypeInfo virtio_blk_info
= {
1324 .name
= TYPE_VIRTIO_BLK
,
1325 .parent
= TYPE_VIRTIO_DEVICE
,
1326 .instance_size
= sizeof(VirtIOBlock
),
1327 .instance_init
= virtio_blk_instance_init
,
1328 .class_init
= virtio_blk_class_init
,
1331 static void virtio_register_types(void)
1333 type_register_static(&virtio_blk_info
);
1336 type_init(virtio_register_types
)