[PATCH 1/2] KVM: arm64: vgic-v4: Don't allocate vPEs for a GICv2 VM

[Fuad Tabba]

On Mon, 26 Oct 2026 at 21:30, Oliver Upton <oupton at kernel.org> wrote:
>
> On Mon, Oct 26, 2026 at 07:55:45PM +0000, Marc Zyngier wrote:
> > On Mon, 26 Oct 2026 19:12:23 +0000,
> > Oliver Upton <oupton at kernel.org> wrote:
> > >
> > > On Mon, Oct 26, 2026 at 03:26:38PM +0000, Fuad Tabba wrote:
> > > > KVM can run a GICv2 VM on a GICv4.0 host whose CPU interface supports
> > > > legacy operation.
> > >
> > > I'm pretty sure there's no IP out there that has GICv4.0 and legacy
> > > mode...
> >
> > My favourite space heater, HiSi D05, says otherwise: 64 A72,
> > GICv4.0. Remember that it is the *CPU* that provides compat mode, and
> > not the GIC.
>
> Well I forgot that one got glued together. Good thing you're on the hook
> for fixes this round then ;)

Can I at least get one of those space heaters for my effort? It's that
time of year after all... :)

/fuad