Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Kristina Martsenko <kristina.martsenko@arm.com>
To:     linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev
Cc:     Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
        Oliver Upton <oliver.upton@linux.dev>,
        James Morse <james.morse@arm.com>,
        Suzuki K Poulose <suzuki.poulose@arm.com>,
        Zenghui Yu <yuzenghui@huawei.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Mark Brown <broonie@kernel.org>,
        Luis Machado <luis.machado@arm.com>,
        Vladimir Murzin <vladimir.murzin@arm.com>,
        linux-kernel@vger.kernel.org
Subject: [PATCH v2 05/11] arm64: mops: don't disable host MOPS instructions from EL2
Date:   Tue,  9 May 2023 15:22:29 +0100
Message-Id: <20230509142235.3284028-6-kristina.martsenko@arm.com>
In-Reply-To: <20230509142235.3284028-1-kristina.martsenko@arm.com>
References: <20230509142235.3284028-1-kristina.martsenko@arm.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.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 7bb2fbddda54..d2d4f4cd12b8 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 (HCRX_EL2_SMPME)
-#define HCRX_HOST_FLAGS 0
+#define HCRX_HOST_FLAGS (HCRX_EL2_MSCEn)
 
 /* TCR_EL2 Registers bits */
 #define TCR_EL2_RES1		((1U << 31) | (1 << 23))
-- 
2.25.1