linux-kernel - Re: [PATCH v4 1/2] KVM: arm64: Expose FEAT

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Message-ID: <aMxyKbnVjS35YuQi@linux.dev>
Date: Thu, 18 Sep 2025 13:57:13 -0700
From: Oliver Upton <oliver.upton@...ux.dev>
To: Mark Brown <broonie@...nel.org>
Cc: Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>, Jonathan Corbet <corbet@....net>,
	Marc Zyngier <maz@...nel.org>, Joey Gouly <joey.gouly@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Shuah Khan <shuah@...nel.org>, linux-arm-kernel@...ts.infradead.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	kvmarm@...ts.linux.dev, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v4 1/2] KVM: arm64: Expose FEAT_LSFE to guests

On Thu, Sep 18, 2025 at 08:42:06PM +0100, Mark Brown wrote:
> FEAT_LSFE (Large System Float Extension), providing atomic floating point
> memory operations, is optional from v9.5. This feature adds no new
> architectural state, expose the relevant ID register field to guests so
> they can discover it.
> 
> Signed-off-by: Mark Brown <broonie@...nel.org>

We also need a test in set_id_regs.c selftest for the writability of
this new feature field.

Otherwise:

Reviewed-by: Oliver Upton <oliver.upton@...ux.dev>

Thanks,
Oliver