linux-kernel - Re: [PATCH v4 00/12] mm/kasan: make kasan=on|off work for all three modes

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Message-ID: <20251205110311.11813A10-hca@linux.ibm.com>
Date: Fri, 5 Dec 2025 12:03:11 +0100
From: Heiko Carstens <hca@...ux.ibm.com>
To: Baoquan He <bhe@...hat.com>
Cc: Andrey Konovalov <andreyknvl@...il.com>, linux-mm@...ck.org,
        ryabinin.a.a@...il.com, glider@...gle.com, dvyukov@...gle.com,
        vincenzo.frascino@....com, akpm@...ux-foundation.org,
        kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org,
        kexec@...ts.infradead.org, elver@...gle.com, sj@...nel.org,
        lorenzo.stoakes@...cle.com, snovitoll@...il.com,
        christophe.leroy@...roup.eu, Mikhail Zaslonko <zaslonko@...ux.ibm.com>
Subject: Re: [PATCH v4 00/12] mm/kasan: make kasan=on|off work for all three
 modes

On Fri, Dec 05, 2025 at 03:14:43PM +0800, Baoquan He wrote:
> On 12/04/25 at 05:38pm, Andrey Konovalov wrote:
> > On Fri, Nov 28, 2025 at 4:33 AM Baoquan He <bhe@...hat.com> wrote:
> > I also wonder if we should keep this kasan=off functionality
> > conservative and limit it to x86 and arm64 (since these are the only
> > two tested architectures).
> 
> We may not need to do that. I tested on arm64 because it has sw_tags and
> hw_tags. And if x86_64 and arm64 works well with kasan=off in generic
> mode, it should be fine on other architectures. I am a little more
> familiar with operations on x86/arm64 than others.  I can manage to get
> power system to test kasan=off in generic mode, if that is required.
> From my side, I would like to see x86_64/arm64/s390/power to have
> kasan=off because RHEL support these architectures. I need consult people
> to make clear how to change in s390. Will post patch later or ask other
> people to help do that.

We are aware that s390 support is missing / does not work, and will
provide something. I guess something based on this series would be
good, or are you planning to send a new version anytime soon?