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

[Oliver Upton]

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@xxxxxxxxxx> 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 ;)

Thanks,
Olier