linux-kernel - [PATCH v3 07/23] kvm: arm64: Initialize MAIR

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Date:   Thu, 26 Nov 2020 15:54:05 +0000
From:   David Brazdil <dbrazdil@...gle.com>
To:     kvmarm@...ts.cs.columbia.edu
Cc:     Jonathan Corbet <corbet@....net>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Dennis Zhou <dennis@...nel.org>, Tejun Heo <tj@...nel.org>,
        Christoph Lameter <cl@...ux.com>,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Sudeep Holla <sudeep.holla@....com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kernel-team@...roid.com, David Brazdil <dbrazdil@...gle.com>
Subject: [PATCH v3 07/23] kvm: arm64: Initialize MAIR_EL2 using a constant

MAIR_EL2 is currently initialized to the value of MAIR_EL1, which itself
is set to a constant MAIR_ELx_SET.

Initialize MAIR_EL2 to MAIR_ELx_SET directly in preparation for allowing
KVM to start CPU cores itself before ERETing to EL1. In that case,
MAIR_EL2 will be initialized before MAIR_EL1.

Signed-off-by: David Brazdil <dbrazdil@...gle.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..17b58dbc3a2f 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_ELx_SET
 	msr	mair_el2, x0
 	isb
 
-- 
2.29.2.454.gaff20da3a2-goog