linux-kernel - Re: [PATCH] mte: Follow arm64.nomte override in MMU setup.

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Message-ID: <CAFKCwrjVaOdrGktxVHLCDPyJSRjZ0B3FHTGsb3PXMULL=dw9rA@mail.gmail.com>
Date:   Tue, 9 Aug 2022 09:41:28 -0700
From:   Evgenii Stepanov <eugenis@...gle.com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Peter Collingbourne <pcc@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mte: Follow arm64.nomte override in MMU setup.

On Tue, Aug 9, 2022 at 1:50 AM Marc Zyngier <maz@...nel.org> wrote:
> How comes such memory is being used? How comes it is in the linear
> map?
>
> arm64.nomte is affecting the use of MTE feature on the platform. It
> doesn't guard the use of a MTE carve-out, and doesn't allow it to be
> used in any shape or form.
>
> To use this memory, you should remove the MTE configuration
> altogether, as you cannot infer what the CPU is doing with it.

This can be used to enable MTE in TZ but not in the NS memory.