[RFC,v9,07/29] memory: Add IOMMU_ATTR_VFIO_NESTED IOMMU memory region attribute

Commit Message

Eric Auger April 11, 2021, 12:08 p.m. UTC

We introduce a new IOMMU Memory Region attribute,
IOMMU_ATTR_VFIO_NESTED that tells whether the virtual IOMMU
requires HW nested paging 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 HW nested paging.

As such SMMUv3 is the first IOMMU device to advertise this
attribute.

Signed-off-by: Eric Auger <[e-mail]>
---
 include/exec/memory.h |  3 ++-
 hw/arm/smmuv3.c       | 12 ++++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

Patch

diff --git a/include/exec/memory.h b/include/exec/memory.h
index 94b9157249..3af3cc1adb 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -273,7 +273,8 @@  typedef struct MemoryRegionClass {
 
 
 enum IOMMUMemoryRegionAttr {
-    IOMMU_ATTR_SPAPR_TCE_FD
+    IOMMU_ATTR_SPAPR_TCE_FD,
+    IOMMU_ATTR_VFIO_NESTED,
 };
 
 /*
diff --git a/hw/arm/smmuv3.c b/hw/arm/smmuv3.c
index a4436868ba..7166008ab0 100644
--- a/hw/arm/smmuv3.c
+++ b/hw/arm/smmuv3.c
@@ -1582,6 +1582,17 @@  static int smmuv3_notify_flag_changed(IOMMUMemoryRegion *iommu,
     return 0;
 }
 
+static int smmuv3_get_attr(IOMMUMemoryRegion *iommu,
+                           enum IOMMUMemoryRegionAttr attr,
+                           void *data)
+{
+    if (attr == IOMMU_ATTR_VFIO_NESTED) {
+        *(bool *) data = true;
+        return 0;
+    }
+    return -EINVAL;
+}
+
 static void smmuv3_iommu_memory_region_class_init(ObjectClass *klass,
                                                   void *data)
 {
@@ -1589,6 +1600,7 @@  static void smmuv3_iommu_memory_region_class_init(ObjectClass *klass,
 
     imrc->translate = smmuv3_translate;
     imrc->notify_flag_changed = smmuv3_notify_flag_changed;
+    imrc->get_attr = smmuv3_get_attr;
 }
 
 static const TypeInfo smmuv3_type_info = {