Re: [libvirt] [Qemu-devel] [RFC PATCH 0/2] ARM: add QMP command to query GIC version

Peter Maydell <peter.maydell(a)linaro.org&gt; writes: > On 15 February 2016 at 15:08, Markus Armbruster <armbru(a)redhat.com&gt; wrote: >> Peter Xu <peterx(a)redhat.com&gt; writes: >>> On Mon, Feb 15, 2016 at 10:52:01AM +0100, Markus Armbruster wrote: >>>> Peter Xu <peterx(a)redhat.com&gt; 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?