[PATCH 0/5] VIRTIO-IOMMU probe request support and MSI bypass on ARM

[Eric Auger]

By default the virtio-iommu translates MSI transactions. This
behavior is inherited from ARM SMMU. However the virt machine
code knows where the MSI doorbells are so we can easily
declare those regions as VIRTIO_IOMMU_RESV_MEM_T_MSI. With that
setting the guest iommu subsystem will not need to map MSIs.
This setup will simplify VFIO integration.

In this series, the ITS doorbell is declared as an MSI region to
be bypassed by the VIRTIO-IOMMU.

This paves the way to the x86 integration where the MSI region
[0xFEE00000,0xFEEFFFFF] will be exposed by q35 machine. However
this is not part of this series.

Best Regards

Eric

This series can be found at:
https://github.com/eauger/qemu/tree/v5.0.0-virtio-iommu-msi-bypass-v1

History:
- Most of those patches were respinned from
  [PATCH for-5.0 v11 00/20] VIRTIO-IOMMU device
  except the last one which is new


Eric Auger (5):
  qdev: Introduce DEFINE_PROP_RESERVED_REGION
  virtio-iommu: Implement RESV_MEM probe request
  virtio-iommu: Handle reserved regions in the translation process
  virtio-iommu-pci: Add array of Interval properties
  hw/arm/virt: Let the virtio-iommu bypass MSIs

 include/exec/memory.h            |   6 ++
 include/hw/qdev-properties.h     |   3 +
 include/hw/virtio/virtio-iommu.h |   2 +
 include/qemu/typedefs.h          |   1 +
 hw/arm/virt.c                    |   5 ++
 hw/core/qdev-properties.c        |  89 +++++++++++++++++++++++++
 hw/virtio/virtio-iommu-pci.c     |   3 +
 hw/virtio/virtio-iommu.c         | 109 ++++++++++++++++++++++++++++++-
 hw/virtio/trace-events           |   1 +
 9 files changed, 217 insertions(+), 2 deletions(-)

-- 
2.20.1