https://bugzilla.redhat.com/show_bug.cgi?id=1266088 We are missing this value for cdrom-image device. It seems like there's no added value to extend this to other types of disk devices [1]. 1: https://www.redhat.com/archives/libvir-list/2016-January/msg01038.html Signed-off-by: Michal Privoznik <mprivozn@redhat.com>