From 29932d07192b03a2f22d63bbf0dfbb49e985b001 Mon Sep 17 00:00:00 2001
From: Jason Wang <jasowang@redhat.com>
Date: Thu, 1 Mar 2018 13:06:13 -0500
Subject: [PATCH] memory: handle alias in memory_region_is_iommu()

Backports commit 12d37882f0c0def5dee1c21be5d8fea9c21baada from qemu
---
 qemu/include/exec/memory.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/qemu/include/exec/memory.h b/qemu/include/exec/memory.h
index 22bbff16..b19c8785 100644
--- a/qemu/include/exec/memory.h
+++ b/qemu/include/exec/memory.h
@@ -577,6 +577,9 @@ static inline bool memory_region_is_romd(MemoryRegion *mr)
  */
 static inline bool memory_region_is_iommu(MemoryRegion *mr)
 {
+    if (mr->alias) {
+        return memory_region_is_iommu(mr->alias);
+    }
     return mr->iommu_ops;
 }