linux-kernel - Re: [PATCH 8/9] KVM: arm64: Allow control of dpISA extensions in ID_AA64ISAR3

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Message-ID: <bc0998d2-fc06-41e5-87aa-25a963947800@sirena.org.uk>
Date: Tue, 29 Oct 2024 19:01:33 +0000
From: Mark Brown <broonie@...nel.org>
To: Marc Zyngier <maz@...nel.org>
Cc: Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>, Jonathan Corbet <corbet@....net>,
	Oliver Upton <oliver.upton@...ux.dev>,
	Joey Gouly <joey.gouly@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Shuah Khan <shuah@...nel.org>, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	kvmarm@...ts.linux.dev, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 8/9] KVM: arm64: Allow control of dpISA extensions in
 ID_AA64ISAR3_EL1

On Tue, Oct 29, 2024 at 04:45:00PM +0000, Marc Zyngier wrote:
> Mark Brown <broonie@...nel.org> wrote:

> > +	ID_WRITABLE(ID_AA64ISAR3_EL1, (ID_AA64ISAR3_EL1_FPRCVT |
> > +				       ID_AA64ISAR3_EL1_FAMINMAX)),

> Please add the required sanitisation of the register so that we do not
> get any surprise exposure of unhandled features when someone changes
> ftr_id_aa64isar3[].

Hrm, right - sorry I missed that.  The other registers I was looking at
don't do any filtering.  This feels like something the helpers should do
but that's simply not how things are structured right now.

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