Hello Nova Team,

eharney and I are working on NFS encrypted volume support [1] and [2].

I'm trying to attach an encrypted volume to a nova instance. However, this fails with "libvirt.libvirtError: internal error: unable to execute QEMU command 'blockdev-add': Image is not in qcow2 format" error. I'm using a Devstack environment (nova/cinder master branch).

Last week I opened a bug report [3] and I'd like to raise some attention to it.

I've proposed a WIP patch [4] with a possible solution that I'd like to get some feedback on or know if should follow a different approach.

Let me know what you think

Thank you

Sofia

[1] https://review.opendev.org/c/openstack/cinder/+/597148
[2] https://review.opendev.org/c/openstack/cinder/+/749155

[3] https://bugs.launchpad.net/nova/+bug/1987311

[4] https://review.opendev.org/c/openstack/nova/+/854030

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