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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:
john cooper 2010-07-02 13:44:25 -04:00 committed by Kevin Wolf
parent 9ac228e02c
commit 2930b313dd
2 changed files with 17 additions and 0 deletions
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14
hw/virtio-blk.c
View File

@ -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);

3
hw/virtio-blk.h
View File

@ -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