[PATCH v1 00/18] arm64/nmi: Support for FEAT_NMI

[Lorenzo Pieralisi]

[...]

> > > Frankly, we are accumulating a bunch of half implemented features
> > > (SME, SPE) for which there is no KVM support, and I don't think this
> > > is the correct direction of travel.
> > 
> > Yeah, it's not great.  For NMIs Lorenzo is looking at the GIC side, I'll
> > let him clarify his schedule.  Here it's more the case that implementing
> > the architecture side without an interrupt controller isn't useful (and
> > certainly not usefully testable) than anything else - my expectation is
> > that it should work fine, though from your comments above it sounds like
> > there will be issues with the handling of PSTATE that I've not realised.
> 
> The vgic support should be rather trivial. It is only a matter of
> adding the required interrupt state, reworking the priority sorting
> and LR stuffing, handling the additional MMIO range and dealing with
> the GIC versioning. Trapping of ALLINT should be done at the same
> time.
> 
> If people cannot be bothered, I'll end-up doing it myself.

Apologies for the slow feedback.

I should be able to do it - I thought that we could start with sorting out
the host required changes but it makes sense to make the KVM changes at
the same time.

Lorenzo