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From: <yee.lee@mediatek.com>
To: <linux-kernel@vger.kernel.org>
Cc: <nicholas.Tang@mediatek.com>, <Kuan-Ying.lee@mediatek.com>,
	<chinwen.chang@mediatek.com>, Yee Lee <yee.lee@mediatek.com>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	"moderated list:ARM/Mediatek SoC support" 
	<linux-arm-kernel@lists.infradead.org>,
	"moderated list:ARM/Mediatek SoC support" 
	<linux-mediatek@lists.infradead.org>
Subject: [PATCH v3 0/1] arm64/cpufeature: Support optionally disable MTE
Date: Fri, 30 Jul 2021 22:49:52 +0800	[thread overview]
Message-ID: <20210730144957.30938-1-yee.lee@mediatek.com> (raw)

From: Yee Lee <yee.lee@mediatek.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


             reply	other threads:[~2021-07-30 14:50 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-30 14:49 yee.lee [this message]
2021-07-30 14:49 ` [PATCH v3 1/1] arm64/cpufeature: Optionally disable MTE via command-line yee.lee
2021-08-02 15:30   ` Catalin Marinas
2021-08-03  5:55     ` Yee Lee
2021-11-25 10:19     ` Yee Lee
2021-12-03 16:33       ` Catalin Marinas
2021-12-14  8:19         ` Yee Lee
2021-12-14 12:02           ` Catalin Marinas

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