Re: [PATCH RFC v2 14/27] arm64: mte: Disable dynamic tag storage management if HW KASAN is enabled

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To: Alexandru Elisei <alexandru.elisei@xxxxxxx>, catalin.marinas@xxxxxxx, will@xxxxxxxxxx, oliver.upton@xxxxxxxxx, maz@xxxxxxxxxx, james.morse@xxxxxxx, suzuki.poulose@xxxxxxx, yuzenghui@xxxxxxxxxx, arnd@xxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, mingo@xxxxxxxxxx, peterz@xxxxxxxxxxxxx, juri.lelli@xxxxxxxxxx, vincent.guittot@xxxxxxxxxx, dietmar.eggemann@xxxxxxx, rostedt@xxxxxxxxxxx, bsegall@xxxxxxxxxx, mgorman@xxxxxxx, bristot@xxxxxxxxxx, vschneid@xxxxxxxxxx, mhiramat@xxxxxxxxxx, rppt@xxxxxxxxxx, hughd@xxxxxxxxxx
Subject: Re: [PATCH RFC v2 14/27] arm64: mte: Disable dynamic tag storage management if HW KASAN is enabled
From: David Hildenbrand <david@xxxxxxxxxx>
Date: Fri, 24 Nov 2023 20:54:12 +0100
Cc: pcc@xxxxxxxxxx, steven.price@xxxxxxx, anshuman.khandual@xxxxxxx, vincenzo.frascino@xxxxxxx, eugenis@xxxxxxxxxx, kcc@xxxxxxxxxx, hyesoo.yu@xxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, kvmarm@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-trace-kernel@xxxxxxxxxxxxxxx
In-reply-to: <20231119165721.9849-15-alexandru.elisei@arm.com>
Organization: Red Hat
User-agent: Mozilla Thunderbird

On 19.11.23 17:57, Alexandru Elisei wrote:

To be able to reserve the tag storage associated with a page requires that
the tag storage page can be migrated.

When HW KASAN is enabled, the kernel allocates pages, which are now tagged,
in non-preemptible contexts, which can make reserving the associate tag
storage impossible.

I assume that it's the only in-kernel user that actually requires taggedmemory (besides for user space), correct?


--
Cheers,

David / dhildenb

Follow-Ups:
- Re: [PATCH RFC v2 14/27] arm64: mte: Disable dynamic tag storage management if HW KASAN is enabled
  - From: Alexandru Elisei

References:
- [PATCH RFC v2 00/27] Add support for arm64 MTE dynamic tag storage reuse
  - From: Alexandru Elisei
- [PATCH RFC v2 14/27] arm64: mte: Disable dynamic tag storage management if HW KASAN is enabled
  - From: Alexandru Elisei

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