Support to allow only boot from cinder volumes

Hey folks, I am trying to see if there are any ways to instruct Openstack to prevent the usage of local storage/ephemeral disks. There are cases where : - I don't want the added complexity of Ceph. - I don't want the added hassle of using local volumes/nfs/shared storage on the computes directly. In an ideal world, creating a VM would mean that you always have a boot-from-volume with the volume being in your chosen backend. I've seen this spec : https://blueprints.launchpad.net/nova/+spec/flavor-root-disk-none But it doesn't seem to have survived the Ocata cycle. Any thoughts? Thanks!