vdpa_sim_blk: handle VIRTIO_BLK_T_GET_ID

Handle VIRTIO_BLK_T_GET_ID request, always answering the
"vdpa_blk_sim" string.

Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Link: https://lore.kernel.org/r/20210315163450.254396-14-sgarzare@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
index a31964e..643ae3b 100644 (file)
--- a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
@@ -38,6 +38,7 @@
 #define VDPASIM_BLK_VQ_NUM     1
 
 static struct vdpasim *vdpasim_blk_dev;
+static char vdpasim_blk_id[VIRTIO_BLK_ID_BYTES] = "vdpa_blk_sim";
 
 static bool vdpasim_blk_check_range(u64 start_sector, size_t range_size)
 {
@@ -153,6 +154,20 @@ static bool vdpasim_blk_handle_req(struct vdpasim *vdpasim,
                }
                break;
 
+       case VIRTIO_BLK_T_GET_ID:
+               bytes = vringh_iov_push_iotlb(&vq->vring, &vq->in_iov,
+                                             vdpasim_blk_id,
+                                             VIRTIO_BLK_ID_BYTES);
+               if (bytes < 0) {
+                       dev_err(&vdpasim->vdpa.dev,
+                               "vringh_iov_push_iotlb() error: %zd\n", bytes);
+                       status = VIRTIO_BLK_S_IOERR;
+                       break;
+               }
+
+               pushed += bytes;
+               break;
+
        default:
                dev_warn(&vdpasim->vdpa.dev,
                         "Unsupported request type %d\n", type);