linux-kernel - Re: [PATCH v2 0/2] arm64: mte: Improve performance by explicitly disabling unwanted tag checking

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <176951239741.2185302.14847899262435443119.b4-ty@kernel.org>
Date: Tue, 27 Jan 2026 11:39:09 +0000
From: Will Deacon <will@...nel.org>
To: Catalin Marinas <catalin.marinas@....com>,
	Carl Worth <carl@...amperecomputing.com>
Cc: kernel-team@...roid.com,
	Will Deacon <will@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Taehyun Noh <taehyun@...xas.edu>
Subject: Re: [PATCH v2 0/2] arm64: mte: Improve performance by explicitly disabling unwanted tag checking

On Thu, 15 Jan 2026 15:07:16 -0800, Carl Worth wrote:
> [Thanks to Taehyun Noh from UT Austin for originally reporting this
> bug. In this cover letter, "we" refers to a collaborative effort
> between indiviuals at both Ampere Computing and UT Austin.]
> 
> We measured severe performance overhead (25-50%) when enabling
> userspace MTE and running memcached on an AmpereOne machine, (detailed
> benchmark results are provided below).
> 
> [...]

Applied TCMA1 patch to arm64 (for-next/cpufeature), thanks!

[2/2] arm64: mte: Set TCMA1 whenever MTE is present in the kernel
      https://git.kernel.org/arm64/c/a4e5927115f3

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev