As of today when a guest is assigned with a host PCI device and
an SMMUv3, VFIO calls memory_region_iommu_replay() default
implementation. This translates the whole address range and
completely stalls the execution. As VFIO/SMMUv3 integration
is not supported yet (it requires SMMUv3 HW nested paging), let's
recognize this situation and fail.

Best Regards

Eric

This series can be found at:
https://github.com/eauger/qemu/tree/v4.1.0_smmu_vfio_fail_v5

History:

v4 -> v5:
- v4 patches: 1, 4, 5 were upstreamed separately
- IOMMU_ATTR_HW_NESTED_PAGING renamed into
  IOMMU_ATTR_NEED_HW_NESTED_PAGING

v3 -> v4:
- see individual patches

v2 -> v3:
- squash IOMMU_ATTR_VFIO_NESTED introduction and SMMUv3 usage
- assert when recognizing VFIO/NESTED case
- collect R-bs

v1 -> v2:
- Added "memory: Remove unused memory_region_iommu_replay_all()" &
  "hw/arm/smmuv3: Log a guest error when decoding an invalid STE"
- do not attempt to implement replay Cb but rather remove the call
  in case it is not needed
- explain why we do not remove other log messages on config decoding


Eric Auger (2):
  memory: Add IOMMU_ATTR_NEED_HW_NESTED_PAGING IOMMU memory region
    attribute
  hw/vfio/common: Fail on VFIO/HW nested paging detection

 hw/arm/smmuv3.c       | 12 ++++++++++++
 hw/vfio/common.c      | 10 ++++++++++
 include/exec/memory.h |  8 +++++++-
 3 files changed, 29 insertions(+), 1 deletion(-)

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2.20.1