Re: [PATCH v10 08/40] arm64/gcs: Provide put_user_gcs()

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To: Mark Brown <broonie@xxxxxxxxxx>
Subject: Re: [PATCH v10 08/40] arm64/gcs: Provide put_user_gcs()
From: Catalin Marinas <catalin.marinas@xxxxxxx>
Date: Fri, 16 Aug 2024 12:12:47 +0100
Cc: Will Deacon <will@xxxxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Marc Zyngier <maz@xxxxxxxxxx>, Oliver Upton <oliver.upton@xxxxxxxxx>, James Morse <james.morse@xxxxxxx>, Suzuki K Poulose <suzuki.poulose@xxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Oleg Nesterov <oleg@xxxxxxxxxx>, Eric Biederman <ebiederm@xxxxxxxxxxxx>, Shuah Khan <shuah@xxxxxxxxxx>, "Rick P. Edgecombe" <rick.p.edgecombe@xxxxxxxxx>, Deepak Gupta <debug@xxxxxxxxxxxx>, Ard Biesheuvel <ardb@xxxxxxxxxx>, Szabolcs Nagy <Szabolcs.Nagy@xxxxxxx>, Kees Cook <kees@xxxxxxxxxx>, "H.J. Lu" <hjl.tools@xxxxxxxxx>, Paul Walmsley <paul.walmsley@xxxxxxxxxx>, Palmer Dabbelt <palmer@xxxxxxxxxxx>, Albert Ou <aou@xxxxxxxxxxxxxxxxx>, Florian Weimer <fweimer@xxxxxxxxxx>, Christian Brauner <brauner@xxxxxxxxxx>, Thiago Jung Bauermann <thiago.bauermann@xxxxxxxxxx>, Ross Burton <ross.burton@xxxxxxx>, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-doc@xxxxxxxxxxxxxxx, kvmarm@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-kselftest@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-riscv@xxxxxxxxxxxxxxxxxxx
In-reply-to: <20240801-arm64-gcs-v10-8-699e2bd2190b@kernel.org>

On Thu, Aug 01, 2024 at 01:06:35PM +0100, Mark Brown wrote:
> In order for EL1 to write to an EL0 GCS it must use the GCSSTTR instruction
> rather than a normal STTR. Provide a put_user_gcs() which does this.
> 
> Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@xxxxxxxxxx>
> Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>

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

References:
- [PATCH v10 00/40] arm64/gcs: Provide support for GCS in userspace
  - From: Mark Brown
- [PATCH v10 08/40] arm64/gcs: Provide put_user_gcs()
  - From: Mark Brown

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