Thread (98 messages) 98 messages, 6 authors, 2023-12-18

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

From: Alexandru Elisei <hidden>
Date: 2023-11-27 15:07:32
Also in: kvmarm, linux-arch, linux-arm-kernel, linux-fsdevel, linux-mm, lkml

Hi,

On Fri, Nov 24, 2023 at 08:54:12PM +0100, David Hildenbrand wrote:
On 19.11.23 17:57, Alexandru Elisei wrote:
quoted
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 tagged
memory (besides for user space), correct?
Indeed, this is the case. I'll expand the commit message to be more clear about
it.

Thanks,
Alex
-- 
Cheers,

David / dhildenb
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