Re: [libvirt] [Qemu-devel] [qemu-devel] Default machine type setting for ppc64
"Daniel P. Berrange" <berrange(a)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
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