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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

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