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From:   David Brazdil <dbrazdil@google.com>
To:     kvmarm@lists.cs.columbia.edu
Cc:     linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Marc Zyngier <maz@kernel.org>,
        James Morse <james.morse@arm.com>,
        Julien Thierry <julien.thierry.kdev@gmail.com>,
        Suzuki K Poulose <suzuki.poulose@arm.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>, Dennis Zhou <dennis@kernel.org>,
        Tejun Heo <tj@kernel.org>, Christoph Lameter <cl@linux.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Quentin Perret <qperret@google.com>,
        Andrew Scull <ascull@google.com>, kernel-team@android.com,
        David Brazdil <dbrazdil@google.com>
Subject: [RFC PATCH 05/26] kvm: arm64: Initialize MAIR_EL2 using a constant
Date:   Wed,  4 Nov 2020 18:36:09 +0000
Message-Id: <20201104183630.27513-6-dbrazdil@google.com>
In-Reply-To: <20201104183630.27513-1-dbrazdil@google.com>
References: <20201104183630.27513-1-dbrazdil@google.com>
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MAIR_EL2 is currently initialized to the value of MAIR_EL1, which itself
is set to a constant MAIR_EL1_SET.

Initialize MAIR_EL2 to the MAIR_EL1_SET constant directly in preparation
of allowing KVM to start CPU cores itself and not initializing itself
before ERETing to EL1. In that case, MAIR_EL2 will be initialized before
MAIR_EL1.

Signed-off-by: David Brazdil <dbrazdil@google.com>
---
 arch/arm64/kvm/hyp/nvhe/hyp-init.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-init.S b/arch/arm64/kvm/hyp/nvhe/hyp-init.S
index b11a9d7db677..96e70f976ff5 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp-init.S
+++ b/arch/arm64/kvm/hyp/nvhe/hyp-init.S
@@ -111,7 +111,7 @@ alternative_else_nop_endif
 
 	msr	tcr_el2, x0
 
-	mrs	x0, mair_el1
+	mov_q	x0, MAIR_EL1_SET
 	msr	mair_el2, x0
 	isb
 
-- 
2.29.1.341.ge80a0c044ae-goog