linux-kernel - Re: [PATCH v13 11/40] arm64/gcs: Provide basic EL2 setup to allow GCS usage at EL0 and EL1

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Message-ID: <Zw5oofuDjuCemq19@arm.com>
Date: Tue, 15 Oct 2024 14:05:37 +0100
From: Catalin Marinas <catalin.marinas@....com>
To: Marc Zyngier <maz@...nel.org>
Cc: Nathan Chancellor <nathan@...nel.org>, Mark Brown <broonie@...nel.org>,
	Will Deacon <will@...nel.org>, Jonathan Corbet <corbet@....net>,
	Andrew Morton <akpm@...ux-foundation.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>,
	David Spickett <david.spickett@....com>,
	Yury Khrustalev <yury.khrustalev@....com>,
	Wilco Dijkstra <wilco.dijkstra@....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 v13 11/40] arm64/gcs: Provide basic EL2 setup to allow
 GCS usage at EL0 and EL1

On Thu, Oct 10, 2024 at 04:18:13PM +0100, Marc Zyngier wrote:
> From 20c98d2647c11db1e40768f92c5998ff5d764a3a Mon Sep 17 00:00:00 2001
> From: Marc Zyngier <maz@...nel.org>
> Date: Thu, 10 Oct 2024 16:13:26 +0100
> Subject: [PATCH] KVM: arm64: Shave a few bytes from the EL2 idmap code
> 
> Our idmap is becoming too big, to the point where it doesn't fit in
> a 4kB page anymore.
> 
> There are some low-hanging fruits though, such as the el2_init_state
> horror that is expanded 3 times in the kernel. Let's at least limit
> ourselves to two copies, which makes the kernel link again.
> 
> At some point, we'll have to have a better way of doing this.
> 
> Reported-by: Nathan Chancellor <nathan@...nel.org>
> Signed-off-by: Marc Zyngier <maz@...nel.org>
> Link: https://lore.kernel.org/r/20241009204903.GA3353168@thelio-3990X

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

Please merge it as a KVM fix if you can. Thanks.

-- 
Catalin