virtio-fs feature allows to share a file system between hypervisor and guest. It has been recently released for RHEL8.2: - https://bugzilla.redhat.com/show_bug.cgi?id=1694164 In the context of CephFS and Manila, virtio-fs would allow to run the ceph client in the hypervisor to provide isolation between storage backend and tenant and later share the fs to the guest through qemu. There was a previous RFE (for virtio-vsock) that got closed once virtio-fs was released, however the piece of code for Manila does not seem to be covered by the current code: - https://bugzilla.redhat.com/show_bug.cgi?id=1363787
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