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virtio-scsi: implement parse_cdb

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Enable passthrough of vendor-specific commands.

Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2014-07-16 11:04:37 +02:00
parent 3e7e180ab3
commit 33cbb2c546
1 changed files with 25 additions and 0 deletions
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25
hw/scsi/virtio-scsi.c
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@ -406,6 +406,30 @@ static void virtio_scsi_command_complete(SCSIRequest *r, uint32_t status,
virtio_scsi_complete_cmd_req(req);
}
static int virtio_scsi_parse_cdb(SCSIDevice *dev, SCSICommand *cmd,
uint8_t *buf, void *hba_private)
{
VirtIOSCSIReq *req = hba_private;
if (cmd->len == 0) {
cmd->len = MIN(VIRTIO_SCSI_CDB_SIZE, SCSI_CMD_BUF_SIZE);
memcpy(cmd->buf, buf, cmd->len);
}
/* Extract the direction and mode directly from the request, for
* host device passthrough.
*/
cmd->xfer = req->qsgl.size;
if (cmd->xfer == 0) {
cmd->mode = SCSI_XFER_NONE;
} else if (iov_size(req->elem.in_sg, req->elem.in_num) > req->resp_size) {
cmd->mode = SCSI_XFER_FROM_DEV;
} else {
cmd->mode = SCSI_XFER_TO_DEV;
}
return 0;
}
static QEMUSGList *virtio_scsi_get_sg_list(SCSIRequest *r)
{
VirtIOSCSIReq *req = r->hba_private;
@ -658,6 +682,7 @@ static struct SCSIBusInfo virtio_scsi_scsi_info = {
.change = virtio_scsi_change,
.hotplug = virtio_scsi_hotplug,
.hot_unplug = virtio_scsi_hot_unplug,
.parse_cdb = virtio_scsi_parse_cdb,
.get_sg_list = virtio_scsi_get_sg_list,
.save_request = virtio_scsi_save_request,
.load_request = virtio_scsi_load_request,