linux-kernel - Re: [PATCH v4 12/14] KVM: arm64: Support FEAT

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Message-ID: <Zdiv4E+sjo6JeiP8@finisterre.sirena.org.uk>
Date: Fri, 23 Feb 2024 14:46:56 +0000
From: Mark Brown <broonie@...nel.org>
To: Marc Zyngier <maz@...nel.org>
Cc: Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Oliver Upton <oliver.upton@...ux.dev>,
	James Morse <james.morse@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Dave Martin <dave.martin@....com>, kvmarm@...ts.linux.dev,
	linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v4 12/14] KVM: arm64: Support FEAT_FPMR for guests

On Fri, Feb 23, 2024 at 11:18:51AM +0000, Marc Zyngier wrote:
> Mark Brown <broonie@...nel.org> wrote:

> >  #define HCRX_GUEST_FLAGS \
> > -	(HCRX_EL2_SMPME | HCRX_EL2_TCR2En | \
> > +	(HCRX_EL2_SMPME | HCRX_EL2_TCR2En | HCRX_EL2_EnFPM | \

> No. We don't do that anymore. This can only be enabled if the guest
> has it advertised via ID_AA64PFR2_EL1.FPMR.

Right, as mentioned in the cover letter (and previously discussed with
one of the other serieses) this needs a rework against your at the time
of posting still pending changes to parse the ID registers.  It looks
like everything is there for those now so I'll do that after the merge
window.

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