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[Qemu-devel] [PATCH 0/2] pcie: Add simple ACS "support" to the generic P

From: Knut Omang
Subject: [Qemu-devel] [PATCH 0/2] pcie: Add simple ACS "support" to the generic PCIe root port
Date: Wed, 23 Jan 2019 19:27:58 +0100

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


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

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