linux-kernel - Re: [PATCH v6 0/8] PCI: hv: Support host bridge probing on ARM64

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Message-ID: <20210802230518.GA1473900@bjorn-Precision-5520>
Date:   Mon, 2 Aug 2021 18:05:18 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Boqun Feng <boqun.feng@...il.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>, Arnd Bergmann <arnd@...db.de>,
        Marc Zyngier <maz@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-hyperv@...r.kernel.org, linux-pci@...r.kernel.org,
        Sunil Muthuswamy <sunilmut@...rosoft.com>,
        Mike Rapoport <rppt@...nel.org>
Subject: Re: [PATCH v6 0/8] PCI: hv: Support host bridge probing on ARM64

On Mon, Aug 02, 2021 at 04:15:04PM +0800, Boqun Feng wrote:
> On Tue, Jul 27, 2021 at 02:06:49AM +0800, Boqun Feng wrote:
> > Hi,
> > 
> > This is the v6 for the preparation of virtual PCI support on Hyper-V
> > ARM64, Previous versions:
> > 
> > v1:	https://lore.kernel.org/lkml/20210319161956.2838291-1-boqun.feng@gmail.com/
> > v2:	https://lore.kernel.org/lkml/20210503144635.2297386-1-boqun.feng@gmail.com/
> > v3:	https://lore.kernel.org/lkml/20210609163211.3467449-1-boqun.feng@gmail.com/
> > v4:	https://lore.kernel.org/lkml/20210714102737.198432-1-boqun.feng@gmail.com/
> > v5:	https://lore.kernel.org/lkml/20210720134429.511541-1-boqun.feng@gmail.com/
> > 
> > Changes since last version:
> > 
> > *	Rebase to 5.14-rc3
> > 
> > *	Comment fixes as suggested by Bjorn.
> > 
> > The basic problem we need to resolve is that ARM64 is an arch with
> > PCI_DOMAINS_GENERIC=y, so the bus sysdata is pci_config_window. However,
> > Hyper-V PCI provides a paravirtualized PCI interface, so there is no
> > actual pci_config_window for a PCI host bridge, so no information can be
> > retrieve from the pci_config_window of a Hyper-V virtual PCI bus. Also
> > there is no corresponding ACPI device for the Hyper-V PCI root bridge,
> > which introduces a special case when trying to find the ACPI device from
> > the sysdata (see patch #3).
> > 
> > With this patchset, we could enable the virtual PCI on Hyper-V ARM64
> > guest with other code under development.
> > 
> > Comments and suggestions are welcome.
> 
> Ping ;-)

Lorenzo normally takes care of the native drivers (including Hyper-V),
so I don't want to get in his way.  If he's too busy and doesn't get a
chance, poke me again after -rc6 or so and I'll pick it up.

> > Arnd Bergmann (1):
> >   PCI: hv: Generify PCI probing
> > 
> > Boqun Feng (7):
> >   PCI: Introduce domain_nr in pci_host_bridge
> >   PCI: Support populating MSI domains of root buses via bridges
> >   arm64: PCI: Restructure pcibios_root_bridge_prepare()
> >   arm64: PCI: Support root bridge preparation for Hyper-V
> >   PCI: hv: Set ->domain_nr of pci_host_bridge at probing time
> >   PCI: hv: Set up MSI domain at bridge probing time
> >   PCI: hv: Turn on the host bridge probing on ARM64
> > 
> >  arch/arm64/kernel/pci.c             | 29 +++++++---
> >  drivers/pci/controller/pci-hyperv.c | 86 +++++++++++++++++------------
> >  drivers/pci/probe.c                 | 12 +++-
> >  include/linux/pci.h                 | 11 ++++
> >  4 files changed, 93 insertions(+), 45 deletions(-)
> > 
> > -- 
> > 2.32.0
> >