linux-kernel - Re: [PATCH 4/5] arm64: mte: Add asymmetric mode support

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Message-ID: <YUipY3x1v2XWeF3n@arm.com>
Date:   Mon, 20 Sep 2021 16:31:47 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Vincenzo Frascino <vincenzo.frascino@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com,
        Andrew Morton <akpm@...ux-foundation.org>,
        Will Deacon <will@...nel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Subject: Re: [PATCH 4/5] arm64: mte: Add asymmetric mode support

On Mon, Sep 13, 2021 at 09:14:23AM +0100, Vincenzo Frascino wrote:
> MTE provides an asymmetric mode for detecting tag exceptions. In
> particular, when such a mode is present, the CPU triggers a fault
> on a tag mismatch during a load operation and asynchronously updates
> a register when a tag mismatch is detected during a store operation.
> 
> Add support for MTE asymmetric mode.
> 
> Note: If the CPU does not support MTE asymmetric mode the kernel falls
> back on synchronous mode which is the default for kasan=on.
> 
> Cc: Will Deacon <will@...nel.org>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Andrey Konovalov <andreyknvl@...il.com>
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com>

Reviewed-by: Catalin Marinas <catalin.marinas@....com>