memory/iommu: Add get_attr()

This adds get_attr() to IOMMUMemoryRegionClass, like
iommu_ops::domain_get_attr in the Linux kernel.

This defines the first attribute - IOMMU_ATTR_SPAPR_TCE_FD - which
will be used between the pSeries machine and VFIO-PCI.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/memory.c b/memory.c
index 449a1429b9..a4c603730a 100644
--- a/memory.c
+++ b/memory.c
@@ -1922,6 +1922,19 @@ void memory_region_notify_iommu(IOMMUMemoryRegion *iommu_mr,
     }
 }
 
+int memory_region_iommu_get_attr(IOMMUMemoryRegion *iommu_mr,
+                                 enum IOMMUMemoryRegionAttr attr,
+                                 void *data)
+{
+    IOMMUMemoryRegionClass *imrc = IOMMU_MEMORY_REGION_GET_CLASS(iommu_mr);
+
+    if (!imrc->get_attr) {
+        return -EINVAL;
+    }
+
+    return imrc->get_attr(iommu_mr, attr, data);
+}
+
 void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client)
 {
     uint8_t mask = 1 << client;