[PATCH 4/5] KVM: arm64: Report optional ID register traps with a 0x18 syndrome

[Marc Zyngier]

On Mon, 24 Nov 2025 10:41:56 +0000,
Ben Horgan <ben.horgan at arm.com> wrote:
> 
> Hi Marc,
> 
> On 11/20/25 13:32, Marc Zyngier wrote:
> > With FEAT_IDST, unimplemented system registers must be reported using
> > EC=0x18 at the closest handling EL, rather than with an UNDEF.
> 
> I think this needs 'in the feature ID space' adding. Something like:
> 
> With FEAT_IDST, unimplemented system registers in the feature ID space
> must be reported using EC=0x18 at the closest handling EL, rather than
> with an UNDEF.

Ah, good point. I got (slightly) carried away!

I'll fold these updates in.

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.