Re: [libvirt] ARM KVM GICv3 Support

On Tue, Dec 15, 2015 at 04:03:13PM +0000, Peter Maydell wrote: > On 15 December 2015 at 14:12, Martin Kletzander <mkletzan(a)redhat.com&gt; wrote: > > On Tue, Dec 15, 2015 at 09:41:02AM +0000, Peter Maydell wrote: > > > > > > On 15 December 2015 at 09:36, Martin Kletzander <mkletzan(a)redhat.com&gt; > > > wrote: > > > > > > > > We do pass some options, for example, you can restrict the GIC to v2: > > > > https://libvirt.org/formatdomain.html#elementsFeatures > > > > > > > > That could be modified to work for your purpose IIUC, right? > > > > > > > > > What does that option do to the QEMU command line? The documentation > > > doesn't seem to say. > > > > > > > It appends gic-version= to the machine option, if bunch of conditions > > are met -- it has to be ARM machine, it has to be something else than > > version 2, and so on, more details are visible in the code and I won't > > cover them here.  I hope that's understandable. > > OK. So it should be sufficient just to have >   <gic version='host'/> > which will then provide whatever VGIC the host machine can do with > hardware acceleration. This is probably good for guests that happy with both. Guests that need/want a specific choice will put their integer there, and then we need a way to do a capabilities check before launching that guest on an arbitrary host.