On Wed, 9 Jun 2021 at 18:32, Boqun Feng <boqun.feng@xxxxxxxxx> wrote: > > Hi Bjorn, Arnd and Marc, > Instead of cc'ing Arnd, you cc'ed me (Ard) > 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 >
