[libvirt] Modern CPU models cannot be used with libvirt

[Daniel P. Berrange]

On Thu, Dec 15, 2011 at 03:54:15PM +0100, Jiri Denemark wrote:
> Hi,
> 
> Recently I realized that all modern CPU models defined in
> /etc/qemu/target-x86_64.conf are useless when qemu is used through libvirt.
> That's because we start qemu with -nodefconfig which results in qemu ignoring
> that file with CPU model definitions. We have a very good reason for using
> -nodefconfig because we need to control the ABI presented to a guest OS and we
> don't want any configuration file that can contain lots of things including
> device definitions to be read by qemu. However, we would really like the new
> CPU models to be understood by qemu even if used through libvirt. What would
> be the best way to solve this?

Ideally libvirt would just write out a config file with the CPU
that was configured in libvirt and pass -readconfig /var/lib/libvirt/qemu/guestcpu.conf
That way libvirt can configure CPU models without regard for
what the particular QEMU version might have in its config.

Daniel
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