linux-kernel - Re: [PATCH 2/4] arm64: mte: Add asynchronous mode support

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Message-ID: <1e1e9d66-32da-6bb8-b4cf-91c03ea90180@arm.com>
Date:   Fri, 8 Jan 2021 17:26:10 +0000
From:   Vincenzo Frascino <vincenzo.frascino@....com>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....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>
Subject: Re: [PATCH 2/4] arm64: mte: Add asynchronous mode support

Hi Andrey,

On 1/8/21 1:36 PM, Andrey Konovalov wrote:
> Perhaps we could add a generic arch-agnostic enum to
> include/linux/kasan.h and use it in both arm64 and KASAN code?
> 
> enum kasan_hw_tags_mode {
>   KASAN_HW_TAGS_SYNC,
>   KASAN_HW_TAGS_ASYNC
> }
> 
> Assuming other architectures that support memory tagging will end up
> with sync/async mode separation as well, this should work. But even if
> that doesn't happen, this interface can be adjusted later.

I am fine with this solution, I will add it in my v3.
As part of the enumeration I will add READ_SYNC mode as well, so we have all the
possible combinations.

-- 
Regards,
Vincenzo