[libvirt] ARM KVM GICv3 Support

[Christoffer Dall]

On Tue, Jan 05, 2016 at 07:26:54PM +0100, Andrea Bolognani wrote:
> On Tue, 2016-01-05 at 18:14 +0000, Peter Maydell wrote:
> > > > Why can libvirt not just run the tool and parse its output?  That's what
> > > > I understood was done for other things, but perhaps I misunderstood.
> > > 
> > > It's the other way around: the tool uses libvirt to implement its
> > > checks. Running a command and parsing its output makes sense when the
> > > binary (as is the case for QEMU) is developed by a third party; if
> > > you control both pieces, it's usually better to stick to C and avoid
> > > spawning extra processes.
> > 
> > That argument suggests libvirt should just go ahead and do the
> > ioctls to check for GICv2/v3 support, rather than spawning a
> > separate QEMU binary to do the check for it ?
> 
> libvirt already has to spawn QEMU and run QMP commands to probe for
> dozens of other capabilities, so we have very robust code to do that.
> 
> Most importantly, as I wrote in a previous mail, if the check is done
> by QEMU we remove the risk of it and libvirt ever disagreeing.
> 
So do I understand correct that what you're looking for is a QMP command
to query for host GIC capabilities?

-Christoffer