nova/releasenotes/notes/deprecate-libvirt-backends-...

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---
deprecations:
- |
Support for the ``xen``, ``uml``, ``lxc`` and ``parallels`` libvirt
backends, configured via the ``[libvirt] virt_type`` config option, has
been deprecated. None of these drivers have upstream testing and the
``xen`` and ``uml`` backends specifically have never been considered
production ready. With this change, only the ``kvm`` and ``qemu`` backends
are considered supported when using the libvirt virt driver.