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From: Marc Zyngier <maz@kernel.org>
To: Mark Brown <broonie@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Oliver Upton <oliver.upton@linux.dev>,
	James Morse <james.morse@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Jonathan Corbet <corbet@lwn.net>, Shuah Khan <shuah@kernel.org>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, Dave Martin <dave.martin@arm.com>,
	kvmarm@lists.linux.dev, linux-doc@vger.kernel.org,
	linux-kselftest@vger.kernel.org
Subject: Re: [PATCH v4 02/14] arm64/fpsimd: Enable host kernel access to FPMR
Date: Fri, 23 Feb 2024 11:34:03 +0000	[thread overview]
Message-ID: <86msrr2z4k.wl-maz@kernel.org> (raw)
In-Reply-To: <20240122-arm64-2023-dpisa-v4-2-776e094861df@kernel.org>

On Mon, 22 Jan 2024 16:28:05 +0000,
Mark Brown <broonie@kernel.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@kernel.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@kernel.org>

	M.

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

WARNING: multiple messages have this Message-ID (diff)
From: Marc Zyngier <maz@kernel.org>
To: Mark Brown <broonie@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Oliver Upton <oliver.upton@linux.dev>,
	James Morse <james.morse@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Jonathan Corbet <corbet@lwn.net>, Shuah Khan <shuah@kernel.org>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, Dave Martin <dave.martin@arm.com>,
	kvmarm@lists.linux.dev, linux-doc@vger.kernel.org,
	linux-kselftest@vger.kernel.org
Subject: Re: [PATCH v4 02/14] arm64/fpsimd: Enable host kernel access to FPMR
Date: Fri, 23 Feb 2024 11:34:03 +0000	[thread overview]
Message-ID: <86msrr2z4k.wl-maz@kernel.org> (raw)
In-Reply-To: <20240122-arm64-2023-dpisa-v4-2-776e094861df@kernel.org>

On Mon, 22 Jan 2024 16:28:05 +0000,
Mark Brown <broonie@kernel.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@kernel.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@kernel.org>

	M.

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

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  reply	other threads:[~2024-02-23 11:34 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-01-22 16:28 [PATCH v4 00/14] arm64: Support for 2023 DPISA extensions Mark Brown
2024-01-22 16:28 ` Mark Brown
2024-01-22 16:28 ` [PATCH v4 01/14] arm64/cpufeature: Hook new identification registers up to cpufeature Mark Brown
2024-01-22 16:28   ` Mark Brown
2024-01-22 16:28 ` [PATCH v4 02/14] arm64/fpsimd: Enable host kernel access to FPMR Mark Brown
2024-01-22 16:28   ` Mark Brown
2024-02-23 11:34   ` Marc Zyngier [this message]
2024-02-23 11:34     ` Marc Zyngier
2024-01-22 16:28 ` [PATCH v4 03/14] arm64/fpsimd: Support FEAT_FPMR Mark Brown
2024-01-22 16:28   ` Mark Brown
2024-02-23 11:07   ` Marc Zyngier
2024-02-23 11:07     ` Marc Zyngier
2024-03-06 16:41     ` Mark Brown
2024-03-06 16:41       ` Mark Brown
2024-01-22 16:28 ` [PATCH v4 04/14] arm64/signal: Add FPMR signal handling Mark Brown
2024-01-22 16:28   ` Mark Brown
2024-01-22 16:28 ` [PATCH v4 05/14] arm64/ptrace: Expose FPMR via ptrace Mark Brown
2024-01-22 16:28   ` Mark Brown
2024-01-22 16:28 ` [PATCH v4 06/14] arm64/hwcap: Define hwcaps for 2023 DPISA features Mark Brown
2024-01-22 16:28   ` Mark Brown
2024-01-22 16:28 ` [PATCH v4 07/14] kselftest/arm64: Handle FPMR context in generic signal frame parser Mark Brown
2024-01-22 16:28   ` Mark Brown
2024-01-22 16:28 ` [PATCH v4 08/14] kselftest/arm64: Add basic FPMR test Mark Brown
2024-01-22 16:28   ` Mark Brown
2024-01-22 16:28 ` [PATCH v4 09/14] kselftest/arm64: Add 2023 DPISA hwcap test coverage Mark Brown
2024-01-22 16:28   ` Mark Brown
2024-01-22 16:28 ` [PATCH v4 10/14] KVM: arm64: Share all userspace hardened thread data with the hypervisor Mark Brown
2024-01-22 16:28   ` Mark Brown
2024-01-22 16:28 ` [PATCH v4 11/14] KVM: arm64: Add newly allocated ID registers to register descriptions Mark Brown
2024-01-22 16:28   ` Mark Brown
2024-02-23 11:33   ` Marc Zyngier
2024-02-23 11:33     ` Marc Zyngier
2024-01-22 16:28 ` [PATCH v4 12/14] KVM: arm64: Support FEAT_FPMR for guests Mark Brown
2024-01-22 16:28   ` Mark Brown
2024-02-23 11:18   ` Marc Zyngier
2024-02-23 11:18     ` Marc Zyngier
2024-02-23 14:46     ` Mark Brown
2024-02-23 14:46       ` Mark Brown
2024-01-22 16:28 ` [PATCH v4 13/14] KVM: arm64: selftests: Document feature registers added in 2023 extensions Mark Brown
2024-01-22 16:28   ` Mark Brown
2024-01-22 16:28 ` [PATCH v4 14/14] KVM: arm64: selftests: Teach get-reg-list about FPMR Mark Brown
2024-01-22 16:28   ` Mark Brown

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