[libvirt] [PATCH 0/4] qemu: Use host-model CPU on s390 by default

[Jiri Denemark]

On Fri, Nov 15, 2019 at 15:12:18 +0100, Boris Fiuczynski wrote:
> Just a heads up.
> After installing libvirt rpms of this branch all my existing kvm s390 
> domains ended up with
> 
>    <cpu mode='custom' match='exact' check='none'>
>      <model fallback='forbid'>qemu</model>
>    </cpu>
> 
> Newly defined domains without specified cpu do so as well.

Unless the domains are all TCG, it seems your QEMU is too old. You need
a fairly recent one which contains commit v4.1.0-1683-gde60a92ea7
(s390x/kvm: Set default cpu model for all machine classes)

I the domains all use KVM and you have new enough QEMU, there might be a
bug somewhere. Which should not happen :=)

Jirka