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-common.h"
16 #include "qemu/error-report.h"
18 #include "hw/block/block.h"
19 #include "sysemu/blockdev.h"
20 #include "hw/virtio/virtio-blk.h"
21 #include "dataplane/virtio-blk.h"
22 #include "migration/migration.h"
23 #include "block/scsi.h"
27 #include "hw/virtio/virtio-bus.h"
28 #include "hw/virtio/virtio-access.h"
30 VirtIOBlockReq
*virtio_blk_alloc_request(VirtIOBlock
*s
)
32 VirtIOBlockReq
*req
= g_slice_new(VirtIOBlockReq
);
39 void virtio_blk_free_request(VirtIOBlockReq
*req
)
42 g_slice_free(VirtIOBlockReq
, req
);
46 static void virtio_blk_complete_request(VirtIOBlockReq
*req
,
49 VirtIOBlock
*s
= req
->dev
;
50 VirtIODevice
*vdev
= VIRTIO_DEVICE(s
);
52 trace_virtio_blk_req_complete(req
, status
);
54 stb_p(&req
->in
->status
, status
);
55 virtqueue_push(s
->vq
, &req
->elem
, req
->qiov
.size
+ sizeof(*req
->in
));
56 virtio_notify(vdev
, s
->vq
);
59 static void virtio_blk_req_complete(VirtIOBlockReq
*req
, unsigned char status
)
61 req
->dev
->complete_request(req
, status
);
64 static int virtio_blk_handle_rw_error(VirtIOBlockReq
*req
, int error
,
67 BlockErrorAction action
= bdrv_get_error_action(req
->dev
->bs
, is_read
, error
);
68 VirtIOBlock
*s
= req
->dev
;
70 if (action
== BLOCK_ERROR_ACTION_STOP
) {
73 } else if (action
== BLOCK_ERROR_ACTION_REPORT
) {
74 virtio_blk_req_complete(req
, VIRTIO_BLK_S_IOERR
);
75 block_acct_done(bdrv_get_stats(s
->bs
), &req
->acct
);
76 virtio_blk_free_request(req
);
79 bdrv_error_action(s
->bs
, action
, is_read
, error
);
80 return action
!= BLOCK_ERROR_ACTION_IGNORE
;
83 static void virtio_blk_rw_complete(void *opaque
, int ret
)
85 VirtIOBlockReq
*req
= opaque
;
87 trace_virtio_blk_rw_complete(req
, ret
);
90 int p
= virtio_ldl_p(VIRTIO_DEVICE(req
->dev
), &req
->out
.type
);
91 bool is_read
= !(p
& VIRTIO_BLK_T_OUT
);
92 if (virtio_blk_handle_rw_error(req
, -ret
, is_read
))
96 virtio_blk_req_complete(req
, VIRTIO_BLK_S_OK
);
97 block_acct_done(bdrv_get_stats(req
->dev
->bs
), &req
->acct
);
98 virtio_blk_free_request(req
);
101 static void virtio_blk_flush_complete(void *opaque
, int ret
)
103 VirtIOBlockReq
*req
= opaque
;
106 if (virtio_blk_handle_rw_error(req
, -ret
, 0)) {
111 virtio_blk_req_complete(req
, VIRTIO_BLK_S_OK
);
112 block_acct_done(bdrv_get_stats(req
->dev
->bs
), &req
->acct
);
113 virtio_blk_free_request(req
);
116 static VirtIOBlockReq
*virtio_blk_get_request(VirtIOBlock
*s
)
118 VirtIOBlockReq
*req
= virtio_blk_alloc_request(s
);
120 if (!virtqueue_pop(s
->vq
, &req
->elem
)) {
121 virtio_blk_free_request(req
);
128 int virtio_blk_handle_scsi_req(VirtIOBlock
*blk
,
129 VirtQueueElement
*elem
)
131 int status
= VIRTIO_BLK_S_OK
;
132 struct virtio_scsi_inhdr
*scsi
= NULL
;
133 VirtIODevice
*vdev
= VIRTIO_DEVICE(blk
);
137 struct sg_io_hdr hdr
;
141 * We require at least one output segment each for the virtio_blk_outhdr
142 * and the SCSI command block.
144 * We also at least require the virtio_blk_inhdr, the virtio_scsi_inhdr
145 * and the sense buffer pointer in the input segments.
147 if (elem
->out_num
< 2 || elem
->in_num
< 3) {
148 status
= VIRTIO_BLK_S_IOERR
;
153 * The scsi inhdr is placed in the second-to-last input segment, just
154 * before the regular inhdr.
156 scsi
= (void *)elem
->in_sg
[elem
->in_num
- 2].iov_base
;
158 if (!blk
->conf
.scsi
) {
159 status
= VIRTIO_BLK_S_UNSUPP
;
164 * No support for bidirection commands yet.
166 if (elem
->out_num
> 2 && elem
->in_num
> 3) {
167 status
= VIRTIO_BLK_S_UNSUPP
;
172 memset(&hdr
, 0, sizeof(struct sg_io_hdr
));
173 hdr
.interface_id
= 'S';
174 hdr
.cmd_len
= elem
->out_sg
[1].iov_len
;
175 hdr
.cmdp
= elem
->out_sg
[1].iov_base
;
178 if (elem
->out_num
> 2) {
180 * If there are more than the minimally required 2 output segments
181 * there is write payload starting from the third iovec.
183 hdr
.dxfer_direction
= SG_DXFER_TO_DEV
;
184 hdr
.iovec_count
= elem
->out_num
- 2;
186 for (i
= 0; i
< hdr
.iovec_count
; i
++)
187 hdr
.dxfer_len
+= elem
->out_sg
[i
+ 2].iov_len
;
189 hdr
.dxferp
= elem
->out_sg
+ 2;
191 } else if (elem
->in_num
> 3) {
193 * If we have more than 3 input segments the guest wants to actually
196 hdr
.dxfer_direction
= SG_DXFER_FROM_DEV
;
197 hdr
.iovec_count
= elem
->in_num
- 3;
198 for (i
= 0; i
< hdr
.iovec_count
; i
++)
199 hdr
.dxfer_len
+= elem
->in_sg
[i
].iov_len
;
201 hdr
.dxferp
= elem
->in_sg
;
204 * Some SCSI commands don't actually transfer any data.
206 hdr
.dxfer_direction
= SG_DXFER_NONE
;
209 hdr
.sbp
= elem
->in_sg
[elem
->in_num
- 3].iov_base
;
210 hdr
.mx_sb_len
= elem
->in_sg
[elem
->in_num
- 3].iov_len
;
212 status
= bdrv_ioctl(blk
->bs
, SG_IO
, &hdr
);
214 status
= VIRTIO_BLK_S_UNSUPP
;
219 * From SCSI-Generic-HOWTO: "Some lower level drivers (e.g. ide-scsi)
220 * clear the masked_status field [hence status gets cleared too, see
221 * block/scsi_ioctl.c] even when a CHECK_CONDITION or COMMAND_TERMINATED
222 * status has occurred. However they do set DRIVER_SENSE in driver_status
223 * field. Also a (sb_len_wr > 0) indicates there is a sense buffer.
225 if (hdr
.status
== 0 && hdr
.sb_len_wr
> 0) {
226 hdr
.status
= CHECK_CONDITION
;
229 virtio_stl_p(vdev
, &scsi
->errors
,
230 hdr
.status
| (hdr
.msg_status
<< 8) |
231 (hdr
.host_status
<< 16) | (hdr
.driver_status
<< 24));
232 virtio_stl_p(vdev
, &scsi
->residual
, hdr
.resid
);
233 virtio_stl_p(vdev
, &scsi
->sense_len
, hdr
.sb_len_wr
);
234 virtio_stl_p(vdev
, &scsi
->data_len
, hdr
.dxfer_len
);
242 /* Just put anything nonzero so that the ioctl fails in the guest. */
244 virtio_stl_p(vdev
, &scsi
->errors
, 255);
249 static void virtio_blk_handle_scsi(VirtIOBlockReq
*req
)
253 status
= virtio_blk_handle_scsi_req(req
->dev
, &req
->elem
);
254 virtio_blk_req_complete(req
, status
);
255 virtio_blk_free_request(req
);
258 void virtio_submit_multiwrite(BlockDriverState
*bs
, MultiReqBuffer
*mrb
)
262 if (!mrb
->num_writes
) {
266 ret
= bdrv_aio_multiwrite(bs
, mrb
->blkreq
, mrb
->num_writes
);
268 for (i
= 0; i
< mrb
->num_writes
; i
++) {
269 if (mrb
->blkreq
[i
].error
) {
270 virtio_blk_rw_complete(mrb
->blkreq
[i
].opaque
, -EIO
);
278 static void virtio_blk_handle_flush(VirtIOBlockReq
*req
, MultiReqBuffer
*mrb
)
280 block_acct_start(bdrv_get_stats(req
->dev
->bs
), &req
->acct
, 0,
284 * Make sure all outstanding writes are posted to the backing device.
286 virtio_submit_multiwrite(req
->dev
->bs
, mrb
);
287 bdrv_aio_flush(req
->dev
->bs
, virtio_blk_flush_complete
, req
);
290 static bool virtio_blk_sect_range_ok(VirtIOBlock
*dev
,
291 uint64_t sector
, size_t size
)
293 uint64_t nb_sectors
= size
>> BDRV_SECTOR_BITS
;
294 uint64_t total_sectors
;
296 if (sector
& dev
->sector_mask
) {
299 if (size
% dev
->conf
.conf
.logical_block_size
) {
302 bdrv_get_geometry(dev
->bs
, &total_sectors
);
303 if (sector
> total_sectors
|| nb_sectors
> total_sectors
- sector
) {
309 static void virtio_blk_handle_write(VirtIOBlockReq
*req
, MultiReqBuffer
*mrb
)
311 BlockRequest
*blkreq
;
314 sector
= virtio_ldq_p(VIRTIO_DEVICE(req
->dev
), &req
->out
.sector
);
316 trace_virtio_blk_handle_write(req
, sector
, req
->qiov
.size
/ 512);
318 if (!virtio_blk_sect_range_ok(req
->dev
, sector
, req
->qiov
.size
)) {
319 virtio_blk_req_complete(req
, VIRTIO_BLK_S_IOERR
);
320 virtio_blk_free_request(req
);
324 block_acct_start(bdrv_get_stats(req
->dev
->bs
), &req
->acct
, req
->qiov
.size
,
327 if (mrb
->num_writes
== 32) {
328 virtio_submit_multiwrite(req
->dev
->bs
, mrb
);
331 blkreq
= &mrb
->blkreq
[mrb
->num_writes
];
332 blkreq
->sector
= sector
;
333 blkreq
->nb_sectors
= req
->qiov
.size
/ BDRV_SECTOR_SIZE
;
334 blkreq
->qiov
= &req
->qiov
;
335 blkreq
->cb
= virtio_blk_rw_complete
;
336 blkreq
->opaque
= req
;
342 static void virtio_blk_handle_read(VirtIOBlockReq
*req
)
346 sector
= virtio_ldq_p(VIRTIO_DEVICE(req
->dev
), &req
->out
.sector
);
348 trace_virtio_blk_handle_read(req
, sector
, req
->qiov
.size
/ 512);
350 if (!virtio_blk_sect_range_ok(req
->dev
, sector
, req
->qiov
.size
)) {
351 virtio_blk_req_complete(req
, VIRTIO_BLK_S_IOERR
);
352 virtio_blk_free_request(req
);
356 block_acct_start(bdrv_get_stats(req
->dev
->bs
), &req
->acct
, req
->qiov
.size
,
358 bdrv_aio_readv(req
->dev
->bs
, sector
, &req
->qiov
,
359 req
->qiov
.size
/ BDRV_SECTOR_SIZE
,
360 virtio_blk_rw_complete
, req
);
363 void virtio_blk_handle_request(VirtIOBlockReq
*req
, MultiReqBuffer
*mrb
)
366 struct iovec
*in_iov
= req
->elem
.in_sg
;
367 struct iovec
*iov
= req
->elem
.out_sg
;
368 unsigned in_num
= req
->elem
.in_num
;
369 unsigned out_num
= req
->elem
.out_num
;
371 if (req
->elem
.out_num
< 1 || req
->elem
.in_num
< 1) {
372 error_report("virtio-blk missing headers");
376 if (unlikely(iov_to_buf(iov
, out_num
, 0, &req
->out
,
377 sizeof(req
->out
)) != sizeof(req
->out
))) {
378 error_report("virtio-blk request outhdr too short");
382 iov_discard_front(&iov
, &out_num
, sizeof(req
->out
));
385 in_iov
[in_num
- 1].iov_len
< sizeof(struct virtio_blk_inhdr
)) {
386 error_report("virtio-blk request inhdr too short");
390 req
->in
= (void *)in_iov
[in_num
- 1].iov_base
391 + in_iov
[in_num
- 1].iov_len
392 - sizeof(struct virtio_blk_inhdr
);
393 iov_discard_back(in_iov
, &in_num
, sizeof(struct virtio_blk_inhdr
));
395 type
= virtio_ldl_p(VIRTIO_DEVICE(req
->dev
), &req
->out
.type
);
397 if (type
& VIRTIO_BLK_T_FLUSH
) {
398 virtio_blk_handle_flush(req
, mrb
);
399 } else if (type
& VIRTIO_BLK_T_SCSI_CMD
) {
400 virtio_blk_handle_scsi(req
);
401 } else if (type
& VIRTIO_BLK_T_GET_ID
) {
402 VirtIOBlock
*s
= req
->dev
;
405 * NB: per existing s/n string convention the string is
406 * terminated by '\0' only when shorter than buffer.
408 const char *serial
= s
->conf
.serial
? s
->conf
.serial
: "";
409 size_t size
= MIN(strlen(serial
) + 1,
410 MIN(iov_size(in_iov
, in_num
),
411 VIRTIO_BLK_ID_BYTES
));
412 iov_from_buf(in_iov
, in_num
, 0, serial
, size
);
413 virtio_blk_req_complete(req
, VIRTIO_BLK_S_OK
);
414 virtio_blk_free_request(req
);
415 } else if (type
& VIRTIO_BLK_T_OUT
) {
416 qemu_iovec_init_external(&req
->qiov
, iov
, out_num
);
417 virtio_blk_handle_write(req
, mrb
);
418 } else if (type
== VIRTIO_BLK_T_IN
|| type
== VIRTIO_BLK_T_BARRIER
) {
419 /* VIRTIO_BLK_T_IN is 0, so we can't just & it. */
420 qemu_iovec_init_external(&req
->qiov
, in_iov
, in_num
);
421 virtio_blk_handle_read(req
);
423 virtio_blk_req_complete(req
, VIRTIO_BLK_S_UNSUPP
);
424 virtio_blk_free_request(req
);
428 static void virtio_blk_handle_output(VirtIODevice
*vdev
, VirtQueue
*vq
)
430 VirtIOBlock
*s
= VIRTIO_BLK(vdev
);
432 MultiReqBuffer mrb
= {
436 /* Some guests kick before setting VIRTIO_CONFIG_S_DRIVER_OK so start
437 * dataplane here instead of waiting for .set_status().
440 virtio_blk_data_plane_start(s
->dataplane
);
444 while ((req
= virtio_blk_get_request(s
))) {
445 virtio_blk_handle_request(req
, &mrb
);
448 virtio_submit_multiwrite(s
->bs
, &mrb
);
451 * FIXME: Want to check for completions before returning to guest mode,
452 * so cached reads and writes are reported as quickly as possible. But
453 * that should be done in the generic block layer.
457 static void virtio_blk_dma_restart_bh(void *opaque
)
459 VirtIOBlock
*s
= opaque
;
460 VirtIOBlockReq
*req
= s
->rq
;
461 MultiReqBuffer mrb
= {
465 qemu_bh_delete(s
->bh
);
471 VirtIOBlockReq
*next
= req
->next
;
472 virtio_blk_handle_request(req
, &mrb
);
476 virtio_submit_multiwrite(s
->bs
, &mrb
);
479 static void virtio_blk_dma_restart_cb(void *opaque
, int running
,
482 VirtIOBlock
*s
= opaque
;
489 s
->bh
= aio_bh_new(bdrv_get_aio_context(s
->conf
.conf
.bs
),
490 virtio_blk_dma_restart_bh
, s
);
491 qemu_bh_schedule(s
->bh
);
495 static void virtio_blk_reset(VirtIODevice
*vdev
)
497 VirtIOBlock
*s
= VIRTIO_BLK(vdev
);
500 virtio_blk_data_plane_stop(s
->dataplane
);
504 * This should cancel pending requests, but can't do nicely until there
505 * are per-device request lists.
508 bdrv_set_enable_write_cache(s
->bs
, s
->original_wce
);
511 /* coalesce internal state, copy to pci i/o region 0
513 static void virtio_blk_update_config(VirtIODevice
*vdev
, uint8_t *config
)
515 VirtIOBlock
*s
= VIRTIO_BLK(vdev
);
516 BlockConf
*conf
= &s
->conf
.conf
;
517 struct virtio_blk_config blkcfg
;
519 int blk_size
= conf
->logical_block_size
;
521 bdrv_get_geometry(s
->bs
, &capacity
);
522 memset(&blkcfg
, 0, sizeof(blkcfg
));
523 virtio_stq_p(vdev
, &blkcfg
.capacity
, capacity
);
524 virtio_stl_p(vdev
, &blkcfg
.seg_max
, 128 - 2);
525 virtio_stw_p(vdev
, &blkcfg
.cylinders
, conf
->cyls
);
526 virtio_stl_p(vdev
, &blkcfg
.blk_size
, blk_size
);
527 virtio_stw_p(vdev
, &blkcfg
.min_io_size
, conf
->min_io_size
/ blk_size
);
528 virtio_stw_p(vdev
, &blkcfg
.opt_io_size
, conf
->opt_io_size
/ blk_size
);
529 blkcfg
.heads
= conf
->heads
;
531 * We must ensure that the block device capacity is a multiple of
532 * the logical block size. If that is not the case, let's use
533 * sector_mask to adopt the geometry to have a correct picture.
534 * For those devices where the capacity is ok for the given geometry
535 * we don't touch the sector value of the geometry, since some devices
536 * (like s390 dasd) need a specific value. Here the capacity is already
537 * cyls*heads*secs*blk_size and the sector value is not block size
538 * divided by 512 - instead it is the amount of blk_size blocks
539 * per track (cylinder).
541 if (bdrv_getlength(s
->bs
) / conf
->heads
/ conf
->secs
% blk_size
) {
542 blkcfg
.sectors
= conf
->secs
& ~s
->sector_mask
;
544 blkcfg
.sectors
= conf
->secs
;
547 blkcfg
.physical_block_exp
= get_physical_block_exp(conf
);
548 blkcfg
.alignment_offset
= 0;
549 blkcfg
.wce
= bdrv_enable_write_cache(s
->bs
);
550 memcpy(config
, &blkcfg
, sizeof(struct virtio_blk_config
));
553 static void virtio_blk_set_config(VirtIODevice
*vdev
, const uint8_t *config
)
555 VirtIOBlock
*s
= VIRTIO_BLK(vdev
);
556 struct virtio_blk_config blkcfg
;
558 memcpy(&blkcfg
, config
, sizeof(blkcfg
));
560 aio_context_acquire(bdrv_get_aio_context(s
->bs
));
561 bdrv_set_enable_write_cache(s
->bs
, blkcfg
.wce
!= 0);
562 aio_context_release(bdrv_get_aio_context(s
->bs
));
565 static uint32_t virtio_blk_get_features(VirtIODevice
*vdev
, uint32_t features
)
567 VirtIOBlock
*s
= VIRTIO_BLK(vdev
);
569 features
|= (1 << VIRTIO_BLK_F_SEG_MAX
);
570 features
|= (1 << VIRTIO_BLK_F_GEOMETRY
);
571 features
|= (1 << VIRTIO_BLK_F_TOPOLOGY
);
572 features
|= (1 << VIRTIO_BLK_F_BLK_SIZE
);
573 features
|= (1 << VIRTIO_BLK_F_SCSI
);
575 if (s
->conf
.config_wce
) {
576 features
|= (1 << VIRTIO_BLK_F_CONFIG_WCE
);
578 if (bdrv_enable_write_cache(s
->bs
))
579 features
|= (1 << VIRTIO_BLK_F_WCE
);
581 if (bdrv_is_read_only(s
->bs
))
582 features
|= 1 << VIRTIO_BLK_F_RO
;
587 static void virtio_blk_set_status(VirtIODevice
*vdev
, uint8_t status
)
589 VirtIOBlock
*s
= VIRTIO_BLK(vdev
);
592 if (s
->dataplane
&& !(status
& (VIRTIO_CONFIG_S_DRIVER
|
593 VIRTIO_CONFIG_S_DRIVER_OK
))) {
594 virtio_blk_data_plane_stop(s
->dataplane
);
597 if (!(status
& VIRTIO_CONFIG_S_DRIVER_OK
)) {
601 features
= vdev
->guest_features
;
603 /* A guest that supports VIRTIO_BLK_F_CONFIG_WCE must be able to send
604 * cache flushes. Thus, the "auto writethrough" behavior is never
605 * necessary for guests that support the VIRTIO_BLK_F_CONFIG_WCE feature.
606 * Leaving it enabled would break the following sequence:
608 * Guest started with "-drive cache=writethrough"
609 * Guest sets status to 0
610 * Guest sets DRIVER bit in status field
611 * Guest reads host features (WCE=0, CONFIG_WCE=1)
612 * Guest writes guest features (WCE=0, CONFIG_WCE=1)
613 * Guest writes 1 to the WCE configuration field (writeback mode)
614 * Guest sets DRIVER_OK bit in status field
616 * s->bs would erroneously be placed in writethrough mode.
618 if (!(features
& (1 << VIRTIO_BLK_F_CONFIG_WCE
))) {
619 aio_context_acquire(bdrv_get_aio_context(s
->bs
));
620 bdrv_set_enable_write_cache(s
->bs
,
621 !!(features
& (1 << VIRTIO_BLK_F_WCE
)));
622 aio_context_release(bdrv_get_aio_context(s
->bs
));
626 static void virtio_blk_save(QEMUFile
*f
, void *opaque
)
628 VirtIODevice
*vdev
= VIRTIO_DEVICE(opaque
);
630 virtio_save(vdev
, f
);
633 static void virtio_blk_save_device(VirtIODevice
*vdev
, QEMUFile
*f
)
635 VirtIOBlock
*s
= VIRTIO_BLK(vdev
);
636 VirtIOBlockReq
*req
= s
->rq
;
639 qemu_put_sbyte(f
, 1);
640 qemu_put_buffer(f
, (unsigned char *)&req
->elem
,
641 sizeof(VirtQueueElement
));
644 qemu_put_sbyte(f
, 0);
647 static int virtio_blk_load(QEMUFile
*f
, void *opaque
, int version_id
)
649 VirtIOBlock
*s
= opaque
;
650 VirtIODevice
*vdev
= VIRTIO_DEVICE(s
);
655 return virtio_load(vdev
, f
, version_id
);
658 static int virtio_blk_load_device(VirtIODevice
*vdev
, QEMUFile
*f
,
661 VirtIOBlock
*s
= VIRTIO_BLK(vdev
);
663 while (qemu_get_sbyte(f
)) {
664 VirtIOBlockReq
*req
= virtio_blk_alloc_request(s
);
665 qemu_get_buffer(f
, (unsigned char *)&req
->elem
,
666 sizeof(VirtQueueElement
));
670 virtqueue_map_sg(req
->elem
.in_sg
, req
->elem
.in_addr
,
671 req
->elem
.in_num
, 1);
672 virtqueue_map_sg(req
->elem
.out_sg
, req
->elem
.out_addr
,
673 req
->elem
.out_num
, 0);
679 static void virtio_blk_resize(void *opaque
)
681 VirtIODevice
*vdev
= VIRTIO_DEVICE(opaque
);
683 virtio_notify_config(vdev
);
686 static const BlockDevOps virtio_block_ops
= {
687 .resize_cb
= virtio_blk_resize
,
690 /* Disable dataplane thread during live migration since it does not
691 * update the dirty memory bitmap yet.
693 static void virtio_blk_migration_state_changed(Notifier
*notifier
, void *data
)
695 VirtIOBlock
*s
= container_of(notifier
, VirtIOBlock
,
696 migration_state_notifier
);
697 MigrationState
*mig
= data
;
700 if (migration_in_setup(mig
)) {
704 virtio_blk_data_plane_destroy(s
->dataplane
);
706 } else if (migration_has_finished(mig
) ||
707 migration_has_failed(mig
)) {
711 bdrv_drain_all(); /* complete in-flight non-dataplane requests */
712 virtio_blk_data_plane_create(VIRTIO_DEVICE(s
), &s
->conf
,
713 &s
->dataplane
, &err
);
715 error_report("%s", error_get_pretty(err
));
721 static void virtio_blk_device_realize(DeviceState
*dev
, Error
**errp
)
723 VirtIODevice
*vdev
= VIRTIO_DEVICE(dev
);
724 VirtIOBlock
*s
= VIRTIO_BLK(dev
);
725 VirtIOBlkConf
*conf
= &s
->conf
;
727 static int virtio_blk_id
;
729 if (!conf
->conf
.bs
) {
730 error_setg(errp
, "drive property not set");
733 if (!bdrv_is_inserted(conf
->conf
.bs
)) {
734 error_setg(errp
, "Device needs media, but drive is empty");
738 blkconf_serial(&conf
->conf
, &conf
->serial
);
739 s
->original_wce
= bdrv_enable_write_cache(conf
->conf
.bs
);
740 blkconf_geometry(&conf
->conf
, NULL
, 65535, 255, 255, &err
);
742 error_propagate(errp
, err
);
746 virtio_init(vdev
, "virtio-blk", VIRTIO_ID_BLOCK
,
747 sizeof(struct virtio_blk_config
));
749 s
->bs
= conf
->conf
.bs
;
751 s
->sector_mask
= (s
->conf
.conf
.logical_block_size
/ BDRV_SECTOR_SIZE
) - 1;
753 s
->vq
= virtio_add_queue(vdev
, 128, virtio_blk_handle_output
);
754 s
->complete_request
= virtio_blk_complete_request
;
755 virtio_blk_data_plane_create(vdev
, conf
, &s
->dataplane
, &err
);
757 error_propagate(errp
, err
);
758 virtio_cleanup(vdev
);
761 s
->migration_state_notifier
.notify
= virtio_blk_migration_state_changed
;
762 add_migration_state_change_notifier(&s
->migration_state_notifier
);
764 s
->change
= qemu_add_vm_change_state_handler(virtio_blk_dma_restart_cb
, s
);
765 register_savevm(dev
, "virtio-blk", virtio_blk_id
++, 2,
766 virtio_blk_save
, virtio_blk_load
, s
);
767 bdrv_set_dev_ops(s
->bs
, &virtio_block_ops
, s
);
768 bdrv_set_guest_block_size(s
->bs
, s
->conf
.conf
.logical_block_size
);
770 bdrv_iostatus_enable(s
->bs
);
773 static void virtio_blk_device_unrealize(DeviceState
*dev
, Error
**errp
)
775 VirtIODevice
*vdev
= VIRTIO_DEVICE(dev
);
776 VirtIOBlock
*s
= VIRTIO_BLK(dev
);
778 remove_migration_state_change_notifier(&s
->migration_state_notifier
);
779 virtio_blk_data_plane_destroy(s
->dataplane
);
781 qemu_del_vm_change_state_handler(s
->change
);
782 unregister_savevm(dev
, "virtio-blk", s
);
783 blockdev_mark_auto_del(s
->bs
);
784 virtio_cleanup(vdev
);
787 static void virtio_blk_instance_init(Object
*obj
)
789 VirtIOBlock
*s
= VIRTIO_BLK(obj
);
791 object_property_add_link(obj
, "iothread", TYPE_IOTHREAD
,
792 (Object
**)&s
->conf
.iothread
,
793 qdev_prop_allow_set_link_before_realize
,
794 OBJ_PROP_LINK_UNREF_ON_RELEASE
, NULL
);
795 device_add_bootindex_property(obj
, &s
->conf
.conf
.bootindex
,
796 "bootindex", "/disk@0,0",
800 static Property virtio_blk_properties
[] = {
801 DEFINE_BLOCK_PROPERTIES(VirtIOBlock
, conf
.conf
),
802 DEFINE_BLOCK_CHS_PROPERTIES(VirtIOBlock
, conf
.conf
),
803 DEFINE_PROP_STRING("serial", VirtIOBlock
, conf
.serial
),
804 DEFINE_PROP_BIT("config-wce", VirtIOBlock
, conf
.config_wce
, 0, true),
806 DEFINE_PROP_BIT("scsi", VirtIOBlock
, conf
.scsi
, 0, true),
808 DEFINE_PROP_BIT("x-data-plane", VirtIOBlock
, conf
.data_plane
, 0, false),
809 DEFINE_PROP_END_OF_LIST(),
812 static void virtio_blk_class_init(ObjectClass
*klass
, void *data
)
814 DeviceClass
*dc
= DEVICE_CLASS(klass
);
815 VirtioDeviceClass
*vdc
= VIRTIO_DEVICE_CLASS(klass
);
817 dc
->props
= virtio_blk_properties
;
818 set_bit(DEVICE_CATEGORY_STORAGE
, dc
->categories
);
819 vdc
->realize
= virtio_blk_device_realize
;
820 vdc
->unrealize
= virtio_blk_device_unrealize
;
821 vdc
->get_config
= virtio_blk_update_config
;
822 vdc
->set_config
= virtio_blk_set_config
;
823 vdc
->get_features
= virtio_blk_get_features
;
824 vdc
->set_status
= virtio_blk_set_status
;
825 vdc
->reset
= virtio_blk_reset
;
826 vdc
->save
= virtio_blk_save_device
;
827 vdc
->load
= virtio_blk_load_device
;
830 static const TypeInfo virtio_device_info
= {
831 .name
= TYPE_VIRTIO_BLK
,
832 .parent
= TYPE_VIRTIO_DEVICE
,
833 .instance_size
= sizeof(VirtIOBlock
),
834 .instance_init
= virtio_blk_instance_init
,
835 .class_init
= virtio_blk_class_init
,
838 static void virtio_register_types(void)
840 type_register_static(&virtio_device_info
);
843 type_init(virtio_register_types
)