linux-kernel - [PATCH 05/10] arm64: mops: don't disable host MOPS instructions from EL2

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Message-Id: <20230216160012.272345-6-kristina.martsenko@arm.com>
Date:   Thu, 16 Feb 2023 16:00:07 +0000
From:   Kristina Martsenko <kristina.martsenko@....com>
To:     linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev
Cc:     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>,
        Zenghui Yu <yuzenghui@...wei.com>,
        Mark Rutland <mark.rutland@....com>,
        Mark Brown <broonie@...nel.org>,
        Luis Machado <luis.machado@....com>,
        Vladimir Murzin <vladimir.murzin@....com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 05/10] arm64: mops: don't disable host MOPS instructions from EL2

To allow nVHE host EL0 and EL1 to use FEAT_MOPS instructions, configure
EL2 to not cause these instructions to be treated as UNDEFINED. A VHE
host is unaffected by this control.

Signed-off-by: Kristina Martsenko <kristina.martsenko@....com>
---
 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 cd8dd307aaba..f37d37957322 100644
--- a/arch/arm64/include/asm/kvm_arm.h
+++ b/arch/arm64/include/asm/kvm_arm.h
@@ -94,7 +94,7 @@
 #define HCR_HOST_VHE_FLAGS (HCR_RW | HCR_TGE | HCR_E2H)
 
 #define HCRX_GUEST_FLAGS 0
-#define HCRX_HOST_FLAGS (HCRX_EL2_SMPME)
+#define HCRX_HOST_FLAGS (HCRX_EL2_SMPME | HCRX_EL2_MSCEn)
 
 /* TCR_EL2 Registers bits */
 #define TCR_EL2_RES1		((1U << 31) | (1 << 23))
-- 
2.25.1