linux-kernel - Re: [PATCHv6 00/11] Linear Address Masking enabling

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Message-ID: <CAG_fn=XA08N+rnpebvXpRHwXJXBtaWNODJ_h0xhGxnsFSykF+A@mail.gmail.com>
Date:   Tue, 23 Aug 2022 10:58:06 +0200
From:   Alexander Potapenko <glider@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.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 00/11] Linear Address Masking enabling

On Mon, Aug 15, 2022 at 3:43 PM Peter Zijlstra <peterz@...radead.org> wrote:
>
> On Mon, Aug 15, 2022 at 07:17:52AM +0300, Kirill A. Shutemov wrote:
>
> > Kirill A. Shutemov (7):
> >   x86/mm: Fix CR3_ADDR_MASK
> >   x86: CPUID and CR3/CR4 flags for Linear Address Masking
> >   mm: Pass down mm_struct to untagged_addr()
> >   x86/mm: Handle LAM on context switch
> >   x86/uaccess: Provide untagged_addr() and remove tags before address
> >     check
> >   x86/mm: Provide arch_prctl() interface for LAM
> >   x86: Expose untagging mask in /proc/$PID/arch_status
>
> Over-all these are not terrible.. I've replied with a few nits; with
> those fixed:
>
> Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>


The patchset is green on the LLVM buildbot:
https://lab.llvm.org/buildbot/#/builders/169, so my Tested-by: tags
persist.
I'm going to make minor changes to HWASan runtime to accommodate for
the new arch_prctl().


-- 
Alexander Potapenko
Software Engineer

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