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

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.