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    SubjectRe: [RFC v3 0/7] PCI: hv: Support host bridge probing on ARM64
    On Thu, Jun 10, 2021 at 04:42:45PM +0100, Marc Zyngier wrote:
    > On 2021-06-10 16:01, Ard Biesheuvel wrote:
    > > On Wed, 9 Jun 2021 at 18:32, Boqun Feng <boqun.feng@gmail.com> wrote:
    > > >
    > > > Hi Bjorn, Arnd and Marc,
    > > >
    > >
    > > Instead of cc'ing Arnd, you cc'ed me (Ard)
    >
    > And I don't know if you intended to Cc me, but you definitely didn't.
    >

    Weird.. seems my sending script got somewhere wrong. Apologies for you
    both, and Arnd.. I did intend to Cc you and Arnd.

    How do you want this to proceed? I could do a resend right now, or I
    could wait for a few days (and see others' feedback) and send a V4 next
    week. Sorry again ;-(

    Regards,
    Boqun

    > Thanks,
    >
    > M.
    >
    > >
    > > > This is the v3 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/
    > > >
    > > > Changes since last version:
    > > >
    > > > * Use a sentinel value approach instead of calling
    > > > pci_bus_find_domain_nr() for every CONFIG_PCI_DOMAIN_GENERIC=y
    > > > arch as per suggestion from
    > > >
    > > > * Improve the commit log and comments for patch #6.
    > > >
    > > > * Rebase to the latest mainline.
    > > >
    > > > 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.
    > > >
    > > > With this patchset, we could enable the virtual PCI on Hyper-V ARM64
    > > > guest with other code under development.
    > > >
    > > > Comments and suggestions are welcome.
    > > >
    > > > Regards,
    > > > Boqun
    > > >
    > > > Arnd Bergmann (1):
    > > > PCI: hv: Generify PCI probing
    > > >
    > > > Boqun Feng (6):
    > > > PCI: Introduce domain_nr in pci_host_bridge
    > > > PCI: Allow msi domain set-up at host probing time
    > > > PCI: hv: Use pci_host_bridge::domain_nr for PCI domain
    > > > PCI: hv: Set up msi domain at bridge probing time
    > > > arm64: PCI: Support root bridge preparation for Hyper-V PCI
    > > > PCI: hv: Turn on the host bridge probing on ARM64
    > > >
    > > > arch/arm64/kernel/pci.c | 7 ++-
    > > > drivers/pci/controller/pci-hyperv.c | 87
    > > > +++++++++++++++++------------
    > > > drivers/pci/probe.c | 9 ++-
    > > > include/linux/pci.h | 10 ++++
    > > > 4 files changed, 73 insertions(+), 40 deletions(-)
    > > >
    > > > --
    > > > 2.30.2
    > > >
    > >
    > > _______________________________________________
    > > linux-arm-kernel mailing list
    > > linux-arm-kernel@lists.infradead.org
    > > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
    >
    > --
    > Who you jivin' with that Cosmik Debris?

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