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>
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@ -26,6 +26,7 @@ typedef struct VirtIOBlock
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QEMUBH *bh;
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QEMUBH *bh;
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BlockConf *conf;
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BlockConf *conf;
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unsigned short sector_mask;
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unsigned short sector_mask;
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char sn[BLOCK_SERIAL_STRLEN];
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} VirtIOBlock;
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} VirtIOBlock;
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static VirtIOBlock *to_virtio_blk(VirtIODevice *vdev)
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static VirtIOBlock *to_virtio_blk(VirtIODevice *vdev)
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@ -324,6 +325,12 @@ static void virtio_blk_handle_request(VirtIOBlockReq *req,
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virtio_blk_handle_flush(req, mrb);
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virtio_blk_handle_flush(req, mrb);
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} else if (req->out->type & VIRTIO_BLK_T_SCSI_CMD) {
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} else if (req->out->type & VIRTIO_BLK_T_SCSI_CMD) {
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virtio_blk_handle_scsi(req);
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virtio_blk_handle_scsi(req);
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} else if (req->out->type & VIRTIO_BLK_T_GET_ID) {
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VirtIOBlock *s = req->dev;
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memcpy(req->elem.in_sg[0].iov_base, s->sn,
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MIN(req->elem.in_sg[0].iov_len, sizeof(s->sn)));
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virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
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} else if (req->out->type & VIRTIO_BLK_T_OUT) {
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} else if (req->out->type & VIRTIO_BLK_T_OUT) {
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qemu_iovec_init_external(&req->qiov, &req->elem.out_sg[1],
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qemu_iovec_init_external(&req->qiov, &req->elem.out_sg[1],
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req->elem.out_num - 1);
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req->elem.out_num - 1);
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@ -481,6 +488,7 @@ VirtIODevice *virtio_blk_init(DeviceState *dev, BlockConf *conf)
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VirtIOBlock *s;
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VirtIOBlock *s;
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int cylinders, heads, secs;
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int cylinders, heads, secs;
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static int virtio_blk_id;
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static int virtio_blk_id;
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DriveInfo *dinfo;
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s = (VirtIOBlock *)virtio_common_init("virtio-blk", VIRTIO_ID_BLOCK,
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s = (VirtIOBlock *)virtio_common_init("virtio-blk", VIRTIO_ID_BLOCK,
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sizeof(struct virtio_blk_config),
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sizeof(struct virtio_blk_config),
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@ -495,6 +503,12 @@ VirtIODevice *virtio_blk_init(DeviceState *dev, BlockConf *conf)
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s->sector_mask = (s->conf->logical_block_size / BDRV_SECTOR_SIZE) - 1;
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s->sector_mask = (s->conf->logical_block_size / BDRV_SECTOR_SIZE) - 1;
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bdrv_guess_geometry(s->bs, &cylinders, &heads, &secs);
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bdrv_guess_geometry(s->bs, &cylinders, &heads, &secs);
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/* NB: per existing s/n string convention the string is terminated
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* by '\0' only when less than sizeof (s->sn)
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*/
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dinfo = drive_get_by_blockdev(s->bs);
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strncpy(s->sn, dinfo->serial, sizeof (s->sn));
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s->vq = virtio_add_queue(&s->vdev, 128, virtio_blk_handle_output);
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s->vq = virtio_add_queue(&s->vdev, 128, virtio_blk_handle_output);
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qemu_add_vm_change_state_handler(virtio_blk_dma_restart_cb, s);
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qemu_add_vm_change_state_handler(virtio_blk_dma_restart_cb, s);
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@ -59,6 +59,9 @@ struct virtio_blk_config
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/* Flush the volatile write cache */
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/* Flush the volatile write cache */
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#define VIRTIO_BLK_T_FLUSH 4
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#define VIRTIO_BLK_T_FLUSH 4
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/* return the device ID string */
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#define VIRTIO_BLK_T_GET_ID 8
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/* Barrier before this op. */
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/* Barrier before this op. */
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#define VIRTIO_BLK_T_BARRIER 0x80000000
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#define VIRTIO_BLK_T_BARRIER 0x80000000
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