diff -r 9c7b55faea5d src/dev/virtio/VirtIO.py
--- a/src/dev/virtio/VirtIO.py  Tue Apr 05 08:08:12 2016 -0500
+++ b/src/dev/virtio/VirtIO.py  Thu May 12 18:19:59 2016 +0000
@@ -65,7 +65,7 @@
 
     ClassCode = 0xff # Misc device
 
-    BAR0 = 0x00000000 # Anywhere in 32-bit space
+    BAR0 = 0x00000001 # Anywhere in 32-bit space; IOREG
     BAR0Size = '0B' # Overridden by the device model
 
     InterruptPin = 0x01 # Use #INTA