For native ppc64el, the charm needs to set cpu_mode=host-passthrough in nova.conf

[Ryan Beisner]

For native ppc64el, the charm needs to set cpu_mode=host-passthrough in nova.conf:
    [libvirt]
    virt_type=kvm
    cpu_mode=host-passthrough

This can be addressed: (a) at the package level; (b) as a charm configuration option; or (c) automagically by the charm hooks via architecture detection.

Input, please & thanks!

[Adam Conrad (adconrad)]

What is the default cpu_mode? Is it "host"? If so, I would assume this is covered by libvirt bug #1468247, which has SRUs in flight.

[James Page (james-page)]

charm has:

        if config('cpu-mode'):
            ctxt['cpu_mode'] = config('cpu-mode')
        elif ctxt['arch'] in ['ppc64el', 'ppc64le']:
            ctxt['cpu_mode'] = 'host-passthrough'

fixing this bug but still allowing things to be overridden by users.