[Qemu-arm] [PATCH v2 2/6] memory: Add IOMMU_ATTR_VFIO_NESTED IOMMU memory region attribute

[Eric Auger]

We introduce a new IOMMU Memory Region attribute,
IOMMU_ATTR_VFIO_NESTED that tells whether the virtual IOMMU
requires physical nested stages for VFIO integration.

Current Intel virtual IOMMU device supports "Caching
Mode" and does not require 2 stages at physical level to be
integrated with VFIO. However SMMUv3 does not implement such
"caching mode" and requires to use physical stage 1 for VFIO
integration.

Signed-off-by: Eric Auger <address@hidden>
---
 include/exec/memory.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/exec/memory.h b/include/exec/memory.h
index bdd76653a8..dd7ef23f96 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -204,7 +204,8 @@ struct MemoryRegionOps {
 };
 
 enum IOMMUMemoryRegionAttr {
-    IOMMU_ATTR_SPAPR_TCE_FD
+    IOMMU_ATTR_SPAPR_TCE_FD,
+    IOMMU_ATTR_VFIO_NESTED,
 };
 
 /**
-- 
2.20.1