linux-kernel - Re: [PATCHv6 06/11] x86/mm: Provide arch

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Date:   Tue, 23 Aug 2022 15:16:30 +0200
From:   Alexander Potapenko <glider@...gle.com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Kostya Serebryany <kcc@...gle.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Taras Madan <tarasmadan@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        "H . J . Lu" <hjl.tools@...il.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv6 06/11] x86/mm: Provide arch_prctl() interface for LAM

On Mon, Aug 22, 2022 at 11:32 AM Alexander Potapenko <glider@...gle.com> wrote:
>
> On Mon, Aug 15, 2022 at 6:15 AM Kirill A. Shutemov
> <kirill.shutemov@...ux.intel.com> wrote:
> >
> > Add a couple 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@...ux.intel.com>
> Reviewed-by: Alexander Potapenko <glider@...gle.com>
And also:

Tested-by: Alexander Potapenko <glider@...gle.com>