linux-kernel - Re: [PATCH 00/15] kasan: x86: arm64: risc-v: KASAN tag-based mode for x86

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Message-ID: <72837fcd-97a8-c213-0098-c8f308c3415d@gentwo.org>
Date: Wed, 5 Feb 2025 10:51:47 -0800 (PST)
From: "Christoph Lameter (Ampere)" <cl@...two.org>
To: Jessica Clarke <jrtc27@...c27.com>
cc: Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>, luto@...nel.org, 
    xin@...or.com, kirill.shutemov@...ux.intel.com, palmer@...belt.com, 
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Subject: Re: [PATCH 00/15] kasan: x86: arm64: risc-v: KASAN tag-based mode
 for x86

On Tue, 4 Feb 2025, Jessica Clarke wrote:

> It’s not “no performance penalty”, there is a cost to tracking the MTE
> tags for checking. In asynchronous (or asymmetric) mode that’s not too


On Ampere Processor hardware there is no penalty since the logic is build
into the usual read/write paths. This is by design. There may be on other
platforms that cannot do this.