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Date: Fri, 16 Aug 2024 12:10:48 +0100
From: Catalin Marinas <catalin.marinas@arm.com>
To: Mark Brown <broonie@kernel.org>
Cc: Will Deacon <will@kernel.org>, Jonathan Corbet <corbet@lwn.net>,
	Andrew Morton <akpm@linux-foundation.org>,
	Marc Zyngier <maz@kernel.org>,
	Oliver Upton <oliver.upton@linux.dev>,
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	Suzuki K Poulose <suzuki.poulose@arm.com>,
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	Eric Biederman <ebiederm@xmission.com>,
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Subject: Re: [PATCH v10 07/40] arm64/gcs: Add manual encodings of GCS
 instructions
Message-ID: <Zr8zuBgFrs6xYR0U@arm.com>
References: <20240801-arm64-gcs-v10-0-699e2bd2190b@kernel.org>
 <20240801-arm64-gcs-v10-7-699e2bd2190b@kernel.org>
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In-Reply-To: <20240801-arm64-gcs-v10-7-699e2bd2190b@kernel.org>

On Thu, Aug 01, 2024 at 01:06:34PM +0100, Mark Brown wrote:
> Define C callable functions for GCS instructions used by the kernel. In
> order to avoid ambitious toolchain requirements for GCS support these are
> manually encoded, this means we have fixed register numbers which will be
> a bit limiting for the compiler but none of these should be used in
> sufficiently fast paths for this to be a problem.
> 
> Note that GCSSTTR is used to store to EL0.
> 
> Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
> Signed-off-by: Mark Brown <broonie@kernel.org>

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