Add virtio disk identification support
This patch adds the final missing bits for support of passing a serial/id string to a virtio-blk guest driver. The guest-side component already exists in the virtio driver, and has recently been reworked by Ryan to export a /sys interface for retrieval of the id from guest userland. Signed-off-by: john cooper <john.cooper@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
parent
9ac228e02c
commit
2930b313dd
@ -26,6 +26,7 @@ typedef struct VirtIOBlock
|
||||
QEMUBH *bh;
|
||||
BlockConf *conf;
|
||||
unsigned short sector_mask;
|
||||
char sn[BLOCK_SERIAL_STRLEN];
|
||||
} VirtIOBlock;
|
||||
|
||||
static VirtIOBlock *to_virtio_blk(VirtIODevice *vdev)
|
||||
@ -324,6 +325,12 @@ static void virtio_blk_handle_request(VirtIOBlockReq *req,
|
||||
virtio_blk_handle_flush(req, mrb);
|
||||
} else if (req->out->type & VIRTIO_BLK_T_SCSI_CMD) {
|
||||
virtio_blk_handle_scsi(req);
|
||||
} else if (req->out->type & VIRTIO_BLK_T_GET_ID) {
|
||||
VirtIOBlock *s = req->dev;
|
||||
|
||||
memcpy(req->elem.in_sg[0].iov_base, s->sn,
|
||||
MIN(req->elem.in_sg[0].iov_len, sizeof(s->sn)));
|
||||
virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
|
||||
} else if (req->out->type & VIRTIO_BLK_T_OUT) {
|
||||
qemu_iovec_init_external(&req->qiov, &req->elem.out_sg[1],
|
||||
req->elem.out_num - 1);
|
||||
@ -481,6 +488,7 @@ VirtIODevice *virtio_blk_init(DeviceState *dev, BlockConf *conf)
|
||||
VirtIOBlock *s;
|
||||
int cylinders, heads, secs;
|
||||
static int virtio_blk_id;
|
||||
DriveInfo *dinfo;
|
||||
|
||||
s = (VirtIOBlock *)virtio_common_init("virtio-blk", VIRTIO_ID_BLOCK,
|
||||
sizeof(struct virtio_blk_config),
|
||||
@ -495,6 +503,12 @@ VirtIODevice *virtio_blk_init(DeviceState *dev, BlockConf *conf)
|
||||
s->sector_mask = (s->conf->logical_block_size / BDRV_SECTOR_SIZE) - 1;
|
||||
bdrv_guess_geometry(s->bs, &cylinders, &heads, &secs);
|
||||
|
||||
/* NB: per existing s/n string convention the string is terminated
|
||||
* by '\0' only when less than sizeof (s->sn)
|
||||
*/
|
||||
dinfo = drive_get_by_blockdev(s->bs);
|
||||
strncpy(s->sn, dinfo->serial, sizeof (s->sn));
|
||||
|
||||
s->vq = virtio_add_queue(&s->vdev, 128, virtio_blk_handle_output);
|
||||
|
||||
qemu_add_vm_change_state_handler(virtio_blk_dma_restart_cb, s);
|
||||
|
@ -59,6 +59,9 @@ struct virtio_blk_config
|
||||
/* Flush the volatile write cache */
|
||||
#define VIRTIO_BLK_T_FLUSH 4
|
||||
|
||||
/* return the device ID string */
|
||||
#define VIRTIO_BLK_T_GET_ID 8
|
||||
|
||||
/* Barrier before this op. */
|
||||
#define VIRTIO_BLK_T_BARRIER 0x80000000
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user