Re: [libvirt] [Qemu-devel] [RFC PATCH 0/2] ARM: add QMP command to query GIC version
On 15 February 2016 at 09:35, Martin Kletzander <mkletzan(a)redhat.com> wrote:
So hardware itself supports some GIC version, let's say 3 for our
case.
Does that mean it can be triggered to do v2 as well? I mean is it
possible that HW supports multiple versions? If yes, then I suspect
there is (will be) HW that does *not* do it
Hardware may be:
GICv2 only
GICv3 only
GICv3 with v2 backwards-compatibility support
and that's where QEMU (or
KVM) must emulate that version.
If the hardware doesn't support the version that we are trying
to provide to the guest then we can't run KVM at all. (KVM
with an emulated interrupt controller is not a supported setup,
because you wouldn't get CPU timer interrupts in the guest.)
thanks
-- PMM