Re: [PATCH v9 10/30] KVM: arm64: Document the KVM ABI for SME

[Peter Maydell]

On Tue, 23 Dec 2025 at 01:22, Mark Brown <broonie@xxxxxxxxxx> wrote:
>
> SME, the Scalable Matrix Extension, is an arm64 extension which adds
> support for matrix operations, with core concepts patterned after SVE.

A late reply, but I just noticed that the cover letter says:

> Userspace access to ZA and (if configured) ZT0 is always available, they
> will be zeroed when the guest runs if disabled in SVCR and the value
> read will be zero if the guest stops with them disabled. This mirrors
> the behaviour of the architecture, enabling access causes ZA and ZT0 to
> be zeroed, while allowing access to SVCR, ZA and ZT0 to be performed in
> any order.

but the doc patch itself says:

> +Access to the ZA and ZT0 registers is only available if SVCR.ZA is set
> +to 1.

Which one is the intention here ?

thanks
-- PMM