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Cinder supports backup and restore of volumes:

http://docs.openstack.org/admin-guide-cloud/content/volume-backup-restore.html

But since your KVM VMs are not managed by Openstack and therefore are not true cinder volumes you can not use the cinder backup and restore function to migrate from a non cinder volume to a cinder volume.

Your best best is to create new VMs on Openstack, attach a cinder volume to those VMs then copy the data over the network.