[libvirt] [Qemu-devel] ARM KVM GICv3 Support

Eric Blake eblake at redhat.com
Tue Feb 2 15:52:12 UTC 2016

On 02/02/2016 07:05 AM, Christoffer Dall wrote:

>> I'm not familiar enough with libvirt, nor the use of QMP, to really argue
>> one way or another, but I find it a bit strange that we'd prefer libvirt
>> to query two entities over one. And, why should the libvirt installed on
>> a particular host prefer gicv3 as the default, just because KVM supports
>> it, even when QEMU does not? 
> I think the assumption here is that if you install a recent libvirt you
> also install a recent QEMU.  You always have the risk of things not
> working if you have too old a QEMU, right?

Libvirt exists for providing back-compat glue.  The following
combinations are supported:

old libvirt, old qemu
new libvirt, old qemu
new libvirt, new qemu

and it is only this combination that might require a libvirt upgrade to
work correctly:

old libvirt, new qemu

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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