linux-kernel - Re: [PATCH v10 09/40] arm64/gcs: Provide basic EL2 setup to allow GCS usage at EL0 and EL1

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Message-ID: <Zr80V8zbb_C5pTGI@arm.com>
Date: Fri, 16 Aug 2024 12:13:27 +0100
From: Catalin Marinas <catalin.marinas@....com>
To: Mark Brown <broonie@...nel.org>
Cc: Will Deacon <will@...nel.org>, Jonathan Corbet <corbet@....net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Marc Zyngier <maz@...nel.org>,
	Oliver Upton <oliver.upton@...ux.dev>,
	James Morse <james.morse@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Arnd Bergmann <arnd@...db.de>, Oleg Nesterov <oleg@...hat.com>,
	Eric Biederman <ebiederm@...ssion.com>,
	Shuah Khan <shuah@...nel.org>,
	"Rick P. Edgecombe" <rick.p.edgecombe@...el.com>,
	Deepak Gupta <debug@...osinc.com>, Ard Biesheuvel <ardb@...nel.org>,
	Szabolcs Nagy <Szabolcs.Nagy@....com>, Kees Cook <kees@...nel.org>,
	"H.J. Lu" <hjl.tools@...il.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Florian Weimer <fweimer@...hat.com>,
	Christian Brauner <brauner@...nel.org>,
	Thiago Jung Bauermann <thiago.bauermann@...aro.org>,
	Ross Burton <ross.burton@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
	kvmarm@...ts.linux.dev, linux-fsdevel@...r.kernel.org,
	linux-arch@...r.kernel.org, linux-mm@...ck.org,
	linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v10 09/40] arm64/gcs: Provide basic EL2 setup to allow
 GCS usage at EL0 and EL1

On Thu, Aug 01, 2024 at 01:06:36PM +0100, Mark Brown wrote:
> There is a control HCRX_EL2.GCSEn which must be set to allow GCS
> features to take effect at lower ELs and also fine grained traps for GCS
> usage at EL0 and EL1.  Configure all these to allow GCS usage by EL0 and
> EL1.
> 
> We also initialise GCSCR_EL1 and GCSCRE0_EL1 to ensure that we can
> execute function call instructions without faulting regardless of the
> state when the kernel is started.
> 
> Signed-off-by: Mark Brown <broonie@...nel.org>

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