linux-kernel - Re: [PATCH v4 02/14] arm64/fpsimd: Enable host kernel access to FPMR

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Date: Fri, 23 Feb 2024 11:34:03 +0000
From: Marc Zyngier <maz@...nel.org>
To: Mark Brown <broonie@...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 02/14] arm64/fpsimd: Enable host kernel access to FPMR

On Mon, 22 Jan 2024 16:28:05 +0000,
Mark Brown <broonie@...nel.org> wrote:
> 
> FEAT_FPMR provides a new generally accessible architectural register FPMR.
> This is only accessible to EL0 and EL1 when HCRX_EL2.EnFPM is set to 1,
> do this when the host is running. The guest part will be done along with
> context switching the new register and exposing it via guest management.
> 
> Signed-off-by: Mark Brown <broonie@...nel.org>
> ---
>  arch/arm64/include/asm/kvm_arm.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
> index 3c6f8ba1e479..7f45ce9170bb 100644
> --- a/arch/arm64/include/asm/kvm_arm.h
> +++ b/arch/arm64/include/asm/kvm_arm.h
> @@ -105,7 +105,7 @@
>  #define HCRX_GUEST_FLAGS \
>  	(HCRX_EL2_SMPME | HCRX_EL2_TCR2En | \
>  	 (cpus_have_final_cap(ARM64_HAS_MOPS) ? (HCRX_EL2_MSCEn | HCRX_EL2_MCE2) : 0))
> -#define HCRX_HOST_FLAGS (HCRX_EL2_MSCEn | HCRX_EL2_TCR2En)
> +#define HCRX_HOST_FLAGS (HCRX_EL2_MSCEn | HCRX_EL2_TCR2En | HCRX_EL2_EnFPM)
>  
>  /* TCR_EL2 Registers bits */
>  #define TCR_EL2_DS		(1UL << 32)
> 

Acked-by: Marc Zyngier <maz@...nel.org>

	M.

-- 
Without deviation from the norm, progress is not possible.