linux-kernel - [PATCH v3 0/1] arm64/cpufeature: Support optionally disable MTE

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Message-ID: <20210730144957.30938-1-yee.lee@mediatek.com>
Date:   Fri, 30 Jul 2021 22:49:52 +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>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>
Subject: [PATCH v3 0/1] arm64/cpufeature: Support optionally disable MTE

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

For some case of low-end devices with limited resources,
an option to disable MTE support is necessary.

This patch supoorts to override id-reg on the 
shadow capability via comandline and suppress MTE feature.

=== Test ===
QEMU5.2 + MTE
passed "arm64.nomte" in cmdline
boot log:
..(skip)
[    0.000000] CPU features: SYS_ID_AA64PFR1_EL1[11:8]: forced to 0

Changed since v3:
 - Add documentation text

Changed since v2:
 - Use id-reg override machanism to suppress feature.

Yee Lee (1):
  arm64/cpufeature: Optionally disable MTE via command-line

 Documentation/admin-guide/kernel-parameters.txt | 3 +++
 arch/arm64/kernel/idreg-override.c              | 2 ++
 2 files changed, 5 insertions(+)

-- 
2.18.0