linux-kernel - Re: [PATCHv3 0/8] Linear Address Masking enabling

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Date:   Thu, 16 Jun 2022 22:52:14 +0000
From:   "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To:     "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "Lutomirski, Andy" <luto@...nel.org>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "hjl.tools@...il.com" <hjl.tools@...il.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "kcc@...gle.com" <kcc@...gle.com>,
        "andreyknvl@...il.com" <andreyknvl@...il.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "dvyukov@...gle.com" <dvyukov@...gle.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "ryabinin.a.a@...il.com" <ryabinin.a.a@...il.com>,
        "glider@...gle.com" <glider@...gle.com>
Subject: Re: [PATCHv3 0/8] Linear Address Masking enabling

On Fri, 2022-06-10 at 17:35 +0300, Kirill A. Shutemov 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.

Arm has this documentation about which memory operations support being
passed tagged pointers, and which do not:
Documentation/arm64/tagged-address-abi.rst

Is the idea that LAM would have something similar, or exactly mirror
the arm ABI? It seems like it is the same right now. Should the docs be
generalized?