This is for compatibility.

Signed-off-by: Peter Xu <peterx@redhat.com>
---
 include/hw/compat.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/hw/compat.h b/include/hw/compat.h
index 55b1765..4c53d60 100644
--- a/include/hw/compat.h
+++ b/include/hw/compat.h
@@ -6,6 +6,10 @@
         .driver   = "pci-bridge",\
         .property = "shpc",\
         .value    = "off",\
+    },{\
+        .driver   = "intel-iommu",\
+        .property = "pt",\
+        .value    = "off",\
     },
 
 #define HW_COMPAT_2_8 \
-- 
2.7.4