nova/releasenotes/notes/aarch64-set-proper-cpu-mode...

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---
upgrade:
- |
On AArch64 architecture ``cpu_mode`` for libvirt is set to ``host-passthrough``
by default.
AArch64 currently lacks ``host-model`` support because neither libvirt nor
QEMU are able to tell what the host CPU model exactly is and there is no
CPU description code for ARM(64) at this point.
.. warning:: ``host-passthrough`` mode will completely break live
migration, *unless* all the Compute nodes (running libvirtd) have
*identical* CPUs.