Based on the comments to the RBD encryption change [1], it looks like there 
will be a new direction for ephemeral disk encryption (embedding it in QEMU 
directly). I assume LVM will work the same way when the time comes. Will there 
be a migration path for the existing ephemeral disk encryption support for LVM 
to the new model?

[1] https://review.openstack.org/#/c/239798/

Yes, as I understand it, the long-term goal is to provide encryption support 
directly in QEMU and have a unified interface for LVM, RBD, and file-based 
backends. I do not yet know what the potential migration path will look like.

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