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