These two patches together implements a PCIe capability config space header for Access Control Services (ACS) for the new Qemu specific generic root port. ACS support in the associated root port is a prerequisite to be able to pass the a function of the device populating the port through to an L2 guest from an unmodified kernel. Without this, the IOMMU group the device belongs to will also include the root port itself, and all functions the device provides.
With an SR/IOV device this becomes even more important, as the whole purpose with SR/IOV is to be able to share out individual VFs to different guests, which will not be permitted by VFIO or the Windows Hyper-V equivalent unless ACS is supported by the root port. These patches can also be found as part of an updated version of my SR/IOV emulation patch set at https://github.com/knuto/qemu/tree/sriov_patches_v9 Knut Omang (2): pcie: Add a simple PCIe ACS (Access Control Services) helper function gen_pcie_root_port: Add ACS (Access Control Services) capability hw/pci-bridge/gen_pcie_root_port.c | 2 ++ hw/pci-bridge/ioh3420.c | 1 - hw/pci-bridge/pcie_root_port.c | 3 +++ hw/pci/pcie.c | 14 ++++++++++++++ include/hw/pci/pcie.h | 1 + include/hw/pci/pcie_port.h | 1 + include/hw/pci/pcie_regs.h | 4 ++++ 7 files changed, 25 insertions(+), 1 deletion(-) base-commit: a8d2b0685681e2f291faaa501efbbd76875f8ec8 -- git-series 0.9.1
