linux-kernel - Re: [PATCH v9 44/44] kselftest/arm64: Check GCR

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Date:   Thu, 12 Nov 2020 09:46:54 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Will Deacon <will.deacon@....com>,
        Vincenzo Frascino <vincenzo.frascino@....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>,
        Kevin Brodsky <kevin.brodsky@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kasan-dev@...glegroups.com, linux-arm-kernel@...ts.infradead.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 44/44] kselftest/arm64: Check GCR_EL1 after context
 switch

On Tue, Nov 10, 2020 at 11:10:41PM +0100, Andrey Konovalov wrote:
> From: Vincenzo Frascino <vincenzo.frascino@....com>
> 
> This test is specific to MTE and verifies that the GCR_EL1 register
> is context switched correctly.
> 
> It spawn 1024 processes and each process spawns 5 threads. Each thread
> writes a random setting of GCR_EL1 through the prctl() system call and
> reads it back verifying that it is the same. If the values are not the
> same it reports a failure.
> 
> Note: The test has been extended to verify that even SYNC and ASYNC mode
> setting is preserved correctly over context switching.
> 
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com>
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>

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