linux-kernel - Re: [PATCH RFC 11/14] arm64: Move the ASID allocator code in a separate file

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Message-ID: <CAJF2gTQtk7VhBgUan6WOZgc3UaQzHL8SxMi=yiHG-8eC207BbQ@mail.gmail.com>
Date:   Fri, 20 Sep 2019 08:07:38 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Jean-Philippe Brucker <jean-philippe@...aro.org>
Cc:     Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Palmer Dabbelt <palmer@...ive.com>, christoffer.dall@....com,
        Atish Patra <Atish.Patra@....com>,
        Julien Grall <julien.grall@....com>, gary@...yguo.net,
        linux-riscv@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        Mike Rapoport <rppt@...ux.ibm.com>, aou@...s.berkeley.edu,
        Arnd Bergmann <arnd@...db.de>, suzuki.poulose@....com,
        Marc Zyngier <marc.zyngier@....com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        linux-arm-kernel@...ts.infradead.org,
        Anup Patel <anup.Patel@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        iommu@...ts.linux-foundation.org, james.morse@....com
Subject: Re: [PATCH RFC 11/14] arm64: Move the ASID allocator code in a
 separate file

On Thu, Sep 19, 2019 at 11:18 PM Jean-Philippe Brucker
<jean-philippe@...aro.org> wrote:

>
> The SMMU does support PCI Virtual Function - an hypervisor can assign a
> VF to a guest, and let that guest partition the VF into smaller contexts
> by using PASID.  What it can't support is assigning partitions of a PCI
> function (VF or PF) to multiple Virtual Machines, since there is a
> single S2 PGD per function (in the Stream Table Entry), rather than one
> S2 PGD per PASID context.
>
In my concept, the two sentences "The SMMU does support PCI Virtual
Functio" v.s. "What it can't support is assigning partitions of a PCI
function (VF or PF) to multiple Virtual Machines" are conflict and I
don't want to play naming game :)

-- 
Best Regards
 Guo Ren

ML: https://lore.kernel.org/linux-csky/