Re: [PATCH v3 2/3] KVM: arm64: Block ID register changes after we rely on the values

[Mark Brown]

On Mon, Sep 28, 2026 at 03:36:36PM +0100, Lorenzo Stoakes (ARM) wrote:
> On Tue, Sep 01, 2026 at 07:18:49PM +0100, Mark Brown wrote:
> > In commit c5bac1ef7df6b ("KVM: arm64: Move existing feature disabling
> > over to FGU infrastructure") a check was added to suppress duplicate
> > recalculation of FGUs based on a flag KVM_ARCH_FLAG_FGU_INITIALIZED. This

> Just for my understanding:

> FGU = Fine-Grained UNDEF -> if feature not present really act as if it's not
> present, don't just not advertise it.

> And that's about ensuring RES0, RES1 handled correctly?

That and registers that are just fully UNDEF.

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