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

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Date:   Wed, 21 Sep 2022 09:36:25 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        "Pan, Jacob jun" <jacob.jun.pan@...el.com>
CC:     "Raj, Ashok" <ashok.raj@...el.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Ashok Raj <ashok_raj@...ux.intel.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "Lutomirski, Andy" <luto@...nel.org>,
        "Peter Zijlstra" <peterz@...radead.org>,
        "x86@...nel.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>,
        "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jason Gunthorpe <jgg@...dia.com>,
        "Joerg Roedel" <joro@...tes.org>
Subject: RE: [PATCHv8 00/11] Linear Address Masking enabling

> From: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Sent: Friday, September 16, 2022 1:29 AM
> 
> I really struggle with naming here. Any suggestions on what XXX has to be
> replaced with? I don't think it has to be limited to LAM as some other
> tagging implementation may come later.

What about ARCH_ENABLE_TAGGED_ADDR_CPU to mark that the application
tags address only on CPU and pays attention to untag when the address is
programmed to a device?

w/ ARCH_ENABLE_TAGGED_ADDR_CPU then LAM and SVA can co-exist.

The original ARCH_ENABLE_TAGGED_ADDR means that tagged address is
used on both CPU and device. Enabling sva on a device behind an iommu
which doesn't support LAM is then rejected if LAM has been enabled. and
vice versa.

Thanks
Kevin