linux-kernel - Re: [PATCH v2 26/37] arm64: mte: Convert gcr

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Message-ID: <20200917170601.GO10662@gaia>
Date:   Thu, 17 Sep 2020 18:06:01 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        kasan-dev@...glegroups.com,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Elena Petrova <lenaptr@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        Will Deacon <will.deacon@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-arm-kernel@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 26/37] arm64: mte: Convert gcr_user into an exclude
 mask

On Tue, Sep 15, 2020 at 11:16:08PM +0200, Andrey Konovalov wrote:
> From: Vincenzo Frascino <vincenzo.frascino@....com>
> 
> The gcr_user mask is a per thread mask that represents the tags that are
> excluded from random generation when the Memory Tagging Extension is
> present and an 'irg' instruction is invoked.
> 
> gcr_user affects the behavior on EL0 only.
> 
> Currently that mask is an include mask and it is controlled by the user
> via prctl() while GCR_EL1 accepts an exclude mask.
> 
> Convert the include mask into an exclude one to make it easier the
> register setting.
> 
> Note: This change will affect gcr_kernel (for EL1) introduced with a
> future patch.
> 
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com>
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>

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