On Thu, Jun 10, 2021 at 04:42:45PM +0100, Marc Zyngier wrote:

On 2021-06-10 16:01, Ard Biesheuvel wrote:

quoted

On Wed, 9 Jun 2021 at 18:32, Boqun Feng [off-list ref] wrote:

quoted

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.

quoted

quoted

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/ (local)
v2:     https://lore.kernel.org/lkml/20210503144635.2297386-1-boqun.feng@gmail.com/ (local)

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

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