From: Xingang Wang <wangxingang5@huawei.com>

These patches add support for configure iommu on/off for pci root bus,
including primary bus and pxb root bus. At present, All root bus
will go through iommu when iommu is configured, which is not flexible.

So this add option to enable/disable iommu for primary bus and pxb
root bus.  When iommu is enabled for the root bus, devices attached to it
will go through iommu. When iommu is disabled for the root bus, devices
will not go through iommu accordingly.

The option example for iommu configuration is like the following:

primary root bus option:
arm: -machine virt iommu=smmuv3,primary_bus_iommu=false(or true)
x86: -machine q35,primary_bus_iommu=false(or true)

pxb root bus:
-device pxb-pcie,bus_nr=0x10,id=pci.10,bus=pcie.0,addr=0x3.0x1,iommu=false 

History:

v1 -> v2:
- Fix some issues
- Took into account Eric's comments, and remove the PCI_BUS_IOMMU flag,
  replace it with a property in PCIHostState.
- Add support for x86 iommu option

Xingang Wang (6):
  hw/pci/pci_host: Add iommu property for pci host
  hw/pci: Add iommu option for pci root bus
  hw/pci: Add pci_root_bus_max_bus
  hw/arm/virt-acpi-build: Add explicit idmap info in IORT table
  hw/i386/acpi-build: Add explicit scope in DMAR table
  hw/i386/acpi-build: Add iommu filter in IVRS table

 hw/arm/virt-acpi-build.c            | 103 ++++++++++++++++++++++------
 hw/arm/virt.c                       |  25 +++++++
 hw/i386/acpi-build.c                |  70 ++++++++++++++++++-
 hw/i386/pc.c                        |  19 +++++
 hw/pci-bridge/pci_expander_bridge.c |   3 +
 hw/pci-host/q35.c                   |   1 +
 hw/pci/pci.c                        |  52 +++++++++++++-
 hw/pci/pci_host.c                   |   2 +
 include/hw/arm/virt.h               |   1 +
 include/hw/i386/pc.h                |   1 +
 include/hw/pci/pci.h                |   2 +
 include/hw/pci/pci_host.h           |   1 +
 12 files changed, 254 insertions(+), 26 deletions(-)

-- 
2.19.1