linux-kernel - [PATCH v2 1/1] arm64/cpufeature: Add arm64.nomte to override id-reg

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Message-ID: <20210729020717.15142-2-yee.lee@mediatek.com>
Date:   Thu, 29 Jul 2021 10:07:12 +0800
From:   <yee.lee@...iatek.com>
To:     <linux-kernel@...r.kernel.org>
CC:     <nicholas.Tang@...iatek.com>, <Kuan-Ying.lee@...iatek.com>,
        <chinwen.chang@...iatek.com>, Yee Lee <yee.lee@...iatek.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Marc Zyngier <maz@...nel.org>,
        David Brazdil <dbrazdil@...gle.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Fuad Tabba <tabba@...gle.com>,
        "moderated list:ARM64 PORT (AARCH64 ARCHITECTURE)" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>
Subject: [PATCH v2 1/1] arm64/cpufeature: Add arm64.nomte to override id-reg

From: Yee Lee <yee.lee@...iatek.com>

Add an alias, "arm64.nomte", to override id-reg and
suppress mte feature.

Suggested-by: Marc Zyngier <maz@...nel.org>
Suggested-by: Suzuki K Poulose <suzuki.poulose@....com>
Signed-off-by: Yee Lee <yee.lee@...iatek.com>
---
 arch/arm64/kernel/idreg-override.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/kernel/idreg-override.c b/arch/arm64/kernel/idreg-override.c
index 53a381a7f65d..d8e606fe3c21 100644
--- a/arch/arm64/kernel/idreg-override.c
+++ b/arch/arm64/kernel/idreg-override.c
@@ -54,6 +54,7 @@ static const struct ftr_set_desc pfr1 __initconst = {
 	.override	= &id_aa64pfr1_override,
 	.fields		= {
 	        { "bt", ID_AA64PFR1_BT_SHIFT },
+		{ "mte", ID_AA64PFR1_MTE_SHIFT},
 		{}
 	},
 };
@@ -100,6 +101,7 @@ static const struct {
 	{ "arm64.nopauth",
 	  "id_aa64isar1.gpi=0 id_aa64isar1.gpa=0 "
 	  "id_aa64isar1.api=0 id_aa64isar1.apa=0"	   },
+	{ "arm64.nomte",		"id_aa64pfr1.mte=0" },
 	{ "nokaslr",			"kaslr.disabled=1" },
 };
 
-- 
2.18.0