linux-kernel - Re: [PATCH v9 04/30] arm64/fpsimd: Check enable bit for FA64 when saving EFI state

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Message-ID: <76bf33a0-968d-4b99-a157-3eef076af69d@sirena.org.uk>
Date: Thu, 29 Jan 2026 16:41:05 +0000
From: Mark Brown <broonie@...nel.org>
To: Alex Bennée <alex.bennee@...aro.org>
Cc: Marc Zyngier <maz@...nel.org>, Joey Gouly <joey.gouly@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Will Deacon <will@...nel.org>, Paolo Bonzini <pbonzini@...hat.com>,
	Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>,
	Oliver Upton <oupton@...nel.org>, Dave Martin <Dave.Martin@....com>,
	Fuad Tabba <tabba@...gle.com>, Mark Rutland <mark.rutland@....com>,
	Ben Horgan <ben.horgan@....com>,
	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org,
	Peter Maydell <peter.maydell@...aro.org>,
	Eric Auger <eric.auger@...hat.com>
Subject: Re: [PATCH v9 04/30] arm64/fpsimd: Check enable bit for FA64 when
 saving EFI state

On Thu, Jan 29, 2026 at 04:39:33PM +0000, Alex Bennée wrote:
> Mark Brown <broonie@...nel.org> writes:

> > Currently when deciding if we need to save FFR when in streaming mode prior
> > to EFI calls we check if FA64 is supported by the system. Since KVM guest
> > support will mean that FA64 might be enabled and disabled at runtime switch
> > to checking if traps for FA64 are enabled in SMCR_EL1 instead.

> This is conflicting with the now merged 63de2b3859ba1 (arm64/efi: Remove
> unneeded SVE/SME fallback preserve/store handling) so I think this patch
> can now be dropped?

Yes, this should go away in the next rebase.

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