On Mon, Feb 15, 2016 at 08:40:54PM +0100, Markus Armbruster wrote: > Peter Maydell <peter.maydell@xxxxxxxxxx> writes: > > > On 15 February 2016 at 15:08, Markus Armbruster <armbru@xxxxxxxxxx> wrote: > >> Peter Xu <peterx@xxxxxxxxxx> writes: > >>> On Mon, Feb 15, 2016 at 10:52:01AM +0100, Markus Armbruster wrote: > >>>> Peter Xu <peterx@xxxxxxxxxx> writes: > >>>> Adding ad hoc queries as we go won't scale. Is there really no generic > >>>> way to get this information, e.g. with qom-get? > >>> > >>> Haven't used "qom-get" before, but it seems to fetch one property > >>> for a specific object. If so, will it be strange to hide some > >>> capability bits into every GIC objects (though there is possibly > >>> one object)? > >> > >> Pardon my ignorance... what are these "GIC objects"? > >> > >> What exactly is the "GIC type", and how would the result of > >> query-gic-capability be used? > > > > The GIC type (for our purposes) is the revision of the interrupt > > controller supported by the host, which comes in two versions > > (v2 and v3). These are not compatible, unless your host has > > the v3-with-v2-compat flavour. If a host is v3-only, it is not > > possible for it to give the guest a v2 virtual interrupt > > controller; if v2, it can't give the guest a v3 virtual interrupt > > controller. (If you ask QEMU to do this via command line options > > we will report an error at startup.) > > How would the command line look like? > Here is what is available today # select gicv2 (this work with and without KVM) qemu-system-aarch64 -M virt # v2 is the default qemu-system-aarch64 -M virt,gic-version=2 ... # select gicv3 (only works with KVM) qemu-system-aarch64 -M virt,gic-version=3 ... # select whatever the host has qemu-system-aarch64 -M virt,gic-version=host ... Thanks, drew -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list