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[RFC,04/20] memory: add IOMMU_ATTR_VFIO_NESTED IOMMU memory region attribute

Message ID 20180901142312.11662-5-eric.auger@redhat.com
State New
Headers show
Series vSMMUv3/pSMMUv3 2 stage VFIO integration | expand

Commit Message

Eric Auger Sept. 1, 2018, 2:22 p.m. UTC 
We introduce a new IOMMU Memory Region attribute, IOMMU_ATTR_VFIO_NESTED
which tells whether the virtual IOMMU requires physical nested
stages for VFIO integration. Intel virtual IOMMU supports Caching
Mode and does not require 2 stages at physical level. However virtual
ARM SMMU does not implement such caching mode and requires to use
physical stage 1 for VFIO integration.

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

diff --git a/include/exec/memory.h b/include/exec/memory.h
index eb4f2fb249..b6e59c139c 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -209,7 +209,8 @@  struct MemoryRegionOps {
 };
 
 enum IOMMUMemoryRegionAttr {
-    IOMMU_ATTR_SPAPR_TCE_FD
+    IOMMU_ATTR_SPAPR_TCE_FD,
+    IOMMU_ATTR_VFIO_NESTED,
 };
 
 /**