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

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Date:   Fri, 20 Sep 2019 09:18:21 +0200
From:   Jean-Philippe Brucker <jean-philippe@...aro.org>
To:     Guo Ren <guoren@...nel.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 Fri, Sep 20, 2019 at 08:07:38AM +0800, Guo Ren wrote:
> 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 :)

That's fine. But to prevent the spread of misinformation: Arm SMMU
supports PCI Virtual Functions.

Thanks,
Jean