Re: [PATCH v3] KVM: arm64: Sanitise ID_AA64MMFR3_EL1.S1P[IO]E

[Mark Brown]

On Wed, Oct 21, 2026 at 03:04:51PM +0100, Marc Zyngier wrote:
> Mark Brown <broonie@xxxxxxxxxx> wrote:

> > It would be nice to have it be more obvious to the VMM and/or it's users
> > that it messed up, as things stand features it thought it had set will
> > just silently vanish from the guest - they'd need to know that this is
> > something that might happen and check after finalization or similar.
> > That's probably more a documentation/education thing than anything for
> > the patch.

> The VMM is an integral part of implementing the architecture. If the
> VMM doesn't cooperate, that's its problem.

Absolutely, it's a bug if the VMM is doing this.  What I'm saying is
that it could be helpful if the bug was made visible, with the silent
fixup VMM bugs could easily lurk around for longer before someone
notices the problem than they might otherwise.

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