linux-kernel - Re: [PATCH v3 3/4] arm64: mte: Enable async tag check fault

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Message-ID: <330506b9-b7e9-8fda-889a-0827229e1a3d@arm.com>
Date:   Mon, 18 Jan 2021 15:40:55 +0000
From:   Vincenzo Frascino <vincenzo.frascino@....com>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com, 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@...gle.com>
Subject: Re: [PATCH v3 3/4] arm64: mte: Enable async tag check fault


On 1/18/21 1:37 PM, Vincenzo Frascino wrote:
>> If a speculated load is allowed to update this reg, we'd probably need an
>> ISB+DSB (I don't think it does, something to check with the architects).
>>
> I will check this with the architects and let you know.

I spoke to the architects and no speculative load can update TFSR_EL1.

-- 
Regards,
Vincenzo