Re: [PATCH 1/3] KVM: arm64: Make ID_PFR1_EL1.GIC writable

On Wed, 22 Oct 2025 08:00:47 +0100, Oliver Upton oliver.upton@linux.dev wrote:

Hey,

On Mon, Oct 13, 2025 at 09:32:05AM +0100, Marc Zyngier wrote:

...

Similarly to ID_AA64PFR0_EL1.GIC, relax ID_PFR1_EL1.GIC to be writable.

This looks fine to me, although I do wonder if we should just allow userspace to write whatever value it wants to the 32-bit ID registers and be done with it.

That's a good point. Nobody really cares about 32bit anyway, and I'd be happy to just let the VMM write whatever it wants. Might be a bit harder to backport, but whoever is interested in AArch32 will be able to do it.

Thanks,

M.