linux-kernel - Re: [PATCH 0/5] arm64: ARMv8.7-A: MTE: Add asymm mode support

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Message-ID: <90cb5600-44cb-1ed5-de4b-d19919090622@arm.com>
Date:   Mon, 4 Oct 2021 17:16:49 +0200
From:   Vincenzo Frascino <vincenzo.frascino@....com>
To:     Will Deacon <will@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com,
        Andrew Morton <akpm@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        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 0/5] arm64: ARMv8.7-A: MTE: Add asymm mode support

Hi Will,

sorry for the late reply but I am on sabbatical :)

On 9/29/21 5:49 PM, Will Deacon wrote:
> I'm surprised not to see any update to:
> 
> 	Documentation/arm64/memory-tagging-extension.rst
> 
> particularly regarding the per-cpu preferred tag checking modes. Is
> asymmetric mode not supported there?
> 

The document that you are pointing out covers the userspace support, this series
introduces the in-kernel support only for asymmetric MTE. The userspace bits for
asymm will be added with a future series.

The confusion comes from the fact, as Peter correctly pointed already, that I
forgot to mention this vital info in the cover letter. Sorry about that I will
make sure that this is addressed in v2.

Thanks!

> Will

-- 
Regards,
Vincenzo