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

David Hildenbrand
2023-11-28T17:06:24Z

On 27.11.23 16:07, Alexandru Elisei wrote:
> Hi,
>
> On Fri, Nov 24, 2023 at 08:54:12PM +0100, David Hildenbrand wrote:
>> 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 tagged
>> memory (besides for user space), correct?
>
> Indeed, this is the case. I'll expand the commit message to be more clear about
> it.
>

Great, thanks!

--
Cheers,

David / dhildenb