[libvirt] [RFC] live migration of VMs with internal snapshots

Hi, As far as I understand, currently there is no way to live migrate qemu VMs that have internal snapshots, because live migration works via qemu drive mirroring, which in turns mirrors only shallow block layer, effectively losing existing embedded snapshots. The problem could be fixed if we created an external delta for all disks with internal snapshots, live migrate such VMs and then auto merge them back into original images. That said, I would like to know very much your opinion on the matter and would also like to know if this approach is affordable. If so, I or one of my colleagues will send a pathset to fix this, otherwise what solution for this problem you will recommend? Thanks, Maxim