linux-kernel - Re: [PATCHv5 00/13] Linear Address Masking enabling

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Date:   Thu, 21 Jul 2022 15:09:00 +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: [PATCHv5 00/13] Linear Address Masking enabling

On Wed, Jul 20, 2022 at 2:59 AM Kirill A. Shutemov
<kirill.shutemov@...ux.intel.com> wrote:
>
> On Mon, Jul 18, 2022 at 07:39:22PM +0200, Alexander Potapenko wrote:
> > On Wed, Jul 13, 2022 at 1:13 AM Kirill A. Shutemov
> > <kirill.shutemov@...ux.intel.com> wrote:
> > >
> > > Linear Address Masking[1] (LAM) modifies the checking that is applied to
> > > 64-bit linear addresses, allowing software to use of the untranslated
> > > address bits for metadata.
> > >
> > > The patchset brings support for LAM for userspace addresses.

For what it's worth, there's an LLVM bot running basic HWASan tests on
QEMU with the latest LAM patches here:
https://lab.llvm.org/buildbot/#/builders/169
So far the bot is happy, giving us some sense of LAM_U57 support being sane.
I'll add some tags to individual patches.