Hi Bjorn, I'm currently working on virtual PCI support for Hyper-V ARM64 guests. Similar to virtual PCI on x86 Hyper-V guests, the PCI root bus is not probed via ACPI (or of), it's probed from Hyper-V VMbus, therefore it doesn't have config window. Since ARM64 is a CONFIG_PCI_DOMAINS_GENERIC=y, PCI core code always treats as the root bus has a config window. So we need to resolve this and want to reuse the code as much as possible. My current solution is introducing a pci_ops::use_arch_sysdata, and if it's true, the PCI core code treats the pci_bus::sysdata as an arch-specific sysdata (rather than pci_config_window) for CONFIG_PCI_DOMAINS_GENERIC=y architectures. This allows us to reuse the existing code for Hyper-V PCI controller. This is simply a proposal, I'm open to any suggestion. Thanks! Regards, Boqun Boqun Feng (2): arm64: PCI: Allow use arch-specific pci sysdata PCI: hv: Tell PCI core arch-specific sysdata is used arch/arm64/include/asm/pci.h | 29 +++++++++++++++++++++++++++++ arch/arm64/kernel/pci.c | 15 ++++++++++++--- drivers/pci/controller/pci-hyperv.c | 3 +++ include/linux/pci.h | 3 +++ 4 files changed, 47 insertions(+), 3 deletions(-) -- 2.30.2
