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    SubjectRe: [RFC v3 0/7] PCI: hv: Support host bridge probing on ARM64
    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.

    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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