linux-kernel - [PATCH v5 2/9] arm64/fpsimd: Enable host kernel access to FPMR

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Message-Id: <20240306-arm64-2023-dpisa-v5-2-c568edc8ed7f@kernel.org>
Date: Wed, 06 Mar 2024 23:14:47 +0000
From: Mark Brown <broonie@...nel.org>
To: Catalin Marinas <catalin.marinas@....com>, 
 Will Deacon <will@...nel.org>, Marc Zyngier <maz@...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>
Cc: 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, 
 Mark Brown <broonie@...nel.org>
Subject: [PATCH v5 2/9] arm64/fpsimd: Enable host kernel access to FPMR

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.

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

-- 
2.30.2