"Daniel P. Berrange" <berrange@redhat.com> writes:
On Tue, May 21, 2013 at 07:55:27PM +1000, Paul Mackerras wrote:
On Tue, May 21, 2013 at 09:39:53AM +0100, Daniel P. Berrange wrote: I think libvirt needs some more sensible way to ask qemu what its capabilities are. Currently it has no way to ask qemu "what machines can you emulate with kvm acceleration?" If the user has asked for a KVM domain then the default machine should be one that can be provided by KVM. At present it isn't, on PowerPC.
If QEMU can provide more intelligent info in this respect, then libvirt can use it. We're doing the best we can with picking defaults given the info QEMU currently provides us.
Thinking about this a little more. OpenStack pushes a lot of configuration to the nodes themselves instead of making things dynamic and exposing APIs (think host network configuration). QEMU actually does allow a user to change the default machine type via the global config file so in theory you could do this with OpenStack. However, since libvirt uses -nouserconfig, this doesn't work in practice. Perhaps the right thing to do for OpenStack is to allow for a user specified configuration file to select things like the default hardware models/machine types? Then this could become node configuration instead of dynamic configuration. I think it could be useful for general users too. Every domain requires a lot of the same boiler plate bits. I think a lot of configurations would benefit from being able to set global domain options. Regards, Anthony Liguori
Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|