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Date:   Wed, 6 Oct 2021 11:58:31 +0100
From:   Will Deacon <will@kernel.org>
To:     Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc:     linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        kasan-dev@googlegroups.com,
        Andrew Morton <akpm@linux-foundation.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        Andrey Ryabinin <aryabinin@virtuozzo.com>,
        Alexander Potapenko <glider@google.com>,
        Marco Elver <elver@google.com>,
        Evgenii Stepanov <eugenis@google.com>,
        Branislav Rankov <Branislav.Rankov@arm.com>,
        Andrey Konovalov <andreyknvl@gmail.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Subject: Re: [PATCH v2 5/5] kasan: Extend KASAN mode kernel parameter
Message-ID: <20211006105831.GA30555@willie-the-truck>
References: <20211004202253.27857-1-vincenzo.frascino@arm.com>
 <20211004202253.27857-6-vincenzo.frascino@arm.com>
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On Mon, Oct 04, 2021 at 09:22:53PM +0100, Vincenzo Frascino wrote:
> Architectures supported by KASAN_HW_TAGS can provide an asymmetric mode
> of execution. On an MTE enabled arm64 hw for example this can be
> identified with the asymmetric tagging mode of execution. In particular,
> when such a mode is present, the CPU triggers a fault on a tag mismatch
> during a load operation and asynchronously updates a register when a tag
> mismatch is detected during a store operation.
> 
> Extend the KASAN HW execution mode kernel command line parameter to
> support asymmetric mode.
> 
> Cc: Dmitry Vyukov <dvyukov@google.com>
> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
> Cc: Alexander Potapenko <glider@google.com>
> Cc: Andrey Konovalov <andreyknvl@gmail.com>
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
> ---
>  Documentation/dev-tools/kasan.rst |  7 +++++--
>  lib/test_kasan.c                  |  2 +-
>  mm/kasan/hw_tags.c                | 27 ++++++++++++++++++++++-----
>  mm/kasan/kasan.h                  | 22 +++++++++++++++++++---
>  mm/kasan/report.c                 |  2 +-
>  5 files changed, 48 insertions(+), 12 deletions(-)

I'll wait for an Ack from Andrey or Marco before queueing this.

Will