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