Hi Bjorn, Arnd and Marc, 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@xxxxxxxxx/ v2: https://lore.kernel.org/lkml/20210503144635.2297386-1-boqun.feng@xxxxxxxxx/ 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
