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Re: [Qemu-devel] [libvirt] Modern CPU models cannot be used with libvirt

From: Daniel P. Berrange
Subject: Re: [Qemu-devel] [libvirt] Modern CPU models cannot be used with libvirt
Date: Thu, 15 Dec 2011 15:42:44 +0000
User-agent: Mutt/1.5.21 (2010-09-15)

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 
That way libvirt can configure CPU models without regard for
what the particular QEMU version might have in its config.

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