linux-kernel - Re: [PATCHv8 00/11] Linear Address Masking enabling

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Message-ID: <20220923004239.ma2gfrmoezsff4ro@box.shutemov.name>
Date:   Fri, 23 Sep 2022 03:42:39 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Jason Gunthorpe <jgg@...dia.com>
Cc:     Dave Hansen <dave.hansen@...el.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Jacob Pan <jacob.jun.pan@...el.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Ashok Raj <ashok_raj@...ux.intel.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
        Kostya Serebryany <kcc@...gle.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Alexander Potapenko <glider@...gle.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-mm@...ck.org, linux-kernel@...r.kernel.org,
        Joerg Roedel <joro@...tes.org>
Subject: Re: [PATCHv8 00/11] Linear Address Masking enabling

On Wed, Sep 21, 2022 at 03:11:34PM -0300, Jason Gunthorpe wrote:
> On Wed, Sep 21, 2022 at 10:11:46AM -0700, Dave Hansen wrote:
> 
> > Are you saying that any device compatibility with an mm is solely
> > determined by the IOMMU in play, so the IOMMU code should host the mm
> > compatibility checks?
> 
> Yes, exactly. Only the HW entity that walks the page tables needs to
> understand their parsing rules and in this case that is only the IOMMU
> block.

But device has to know what bits of the virtual address are significant to
handle device TLB lookup/store correctly, no?

-- 
  Kiryl Shutsemau / Kirill A. Shutemov