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SubjectRe: [PATCHv15 08/17] x86/mm: Provide arch_prctl() interface for LAM
On Mon, Jan 23, 2023 at 11:05 PM Kirill A. Shutemov
<kirill.shutemov@linux.intel.com> wrote:
>
> Add a few of arch_prctl() handles:
>
> - ARCH_ENABLE_TAGGED_ADDR enabled LAM. The argument is required number
> of tag bits. It is rounded up to the nearest LAM mode that can
> provide it. For now only LAM_U57 is supported, with 6 tag bits.
>
> - ARCH_GET_UNTAG_MASK returns untag mask. It can indicates where tag
> bits located in the address.
>
> - ARCH_GET_MAX_TAG_BITS returns the maximum tag bits user can request.
> Zero if LAM is not supported.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Alexander Potapenko <glider@google.com>

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