Index: head/usr.sbin/bhyve/pci_virtio_scsi.c
===================================================================
--- head/usr.sbin/bhyve/pci_virtio_scsi.c
+++ head/usr.sbin/bhyve/pci_virtio_scsi.c
@@ -309,7 +309,8 @@
 	/* initialize config structure */
 	sc->vss_config = (struct pci_vtscsi_config){
 		.num_queues = VTSCSI_REQUESTQ,
-		.seg_max = VTSCSI_MAXSEG,
+		/* Leave room for the request and the response. */
+		.seg_max = VTSCSI_MAXSEG - 2,
 		.max_sectors = 2,
 		.cmd_per_lun = 1,
 		.event_info_size = sizeof(struct pci_vtscsi_event),