Re: [libvirt] [Qemu-devel] [qemu-devel] Default machine type setting for ppc64

"Daniel P. Berrange" <berrange(a)redhat.com&gt; 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: >>> QEMU has the notion of a default machine for each target, and that is >>> what libvirt uses if the user hasn't specified a machine. It is not >>> libvirt's job to override QEMU's notion of the default machine here, >>> so if the 'mac99' machine type isn't suitable as the default either >>> QEMU needs to change that for the ppc target, or the user needs to >>> explicitly specify their desired machine type. >> >> We are getting the default changed to 'pseries', at least for cases >> where pseries support is compiled in, which isn't necessarily >> always. That will of course not satisfy the Freescale guys. >> >> 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. We've talked in the past about having an accelerator specific machine default. I think this is a perfectly reasonable thing to do and would solve the problem for ARM and for PPC.