Index: sys/x86/xen/xenpv.c
===================================================================
--- sys/x86/xen/xenpv.c
+++ sys/x86/xen/xenpv.c
@@ -45,6 +45,7 @@
 
 #include <xen/xen-os.h>
 #include <xen/gnttab.h>
+#include <xen/busdma_xen.h>
 
 #include "xenmem_if.h"
 
@@ -145,6 +146,19 @@
 	return (bus_release_resource(child, SYS_RES_MEMORY, res_id, res));
 }
 
+static bus_dma_tag_t
+xenpv_get_dma_tag(device_t bus, device_t child)
+{
+	bus_dma_tag_t parent, newtag;
+
+	parent = bus_get_dma_tag(bus);
+
+	newtag = xen_get_dma_tag(parent);
+	KASSERT(newtag != NULL, ("%s: Failed to create Xen DMA tag", __func__));
+
+	return (newtag);
+}
+
 static device_method_t xenpv_methods[] = {
 	/* Device interface */
 	DEVMETHOD(device_identify,		xenpv_identify),
@@ -159,6 +173,7 @@
 	DEVMETHOD(bus_release_resource,		bus_generic_release_resource),
 	DEVMETHOD(bus_activate_resource,	bus_generic_activate_resource),
 	DEVMETHOD(bus_deactivate_resource,	bus_generic_deactivate_resource),
+	DEVMETHOD(bus_get_dma_tag,		xenpv_get_dma_tag),
 
 	/* Interface to allocate memory for foreign mappings */
 	DEVMETHOD(xenmem_alloc,			xenpv_alloc_physmem),