xen/ioemu-blktap-fv-init.patch

--- a/tools/qemu-xen-traditional-dir-remote/hw/xen_machine_fv.c
+++ b/tools/qemu-xen-traditional-dir-remote/hw/xen_machine_fv.c
@@ -270,6 +270,7 @@ void qemu_invalidate_entry(uint8_t *buff
 
 #endif /* defined(MAPCACHE) */
 
+extern void init_blktap(void);
 
 static void xen_init_fv(ram_addr_t ram_size, int vga_ram_size,
 			const char *boot_device,
@@ -295,6 +296,11 @@ static void xen_init_fv(ram_addr_t ram_s
     }
 #endif
 
+#if defined(CONFIG_BLKTAP1) && !defined(CONFIG_STUBDOM) && !defined(__NetBSD__)
+    /* Initialize tapdisk client */
+    init_blktap();
+#endif
+
 #ifdef CONFIG_STUBDOM /* the hvmop is not supported on older hypervisors */
     xc_set_hvm_param(xc_handle, domid, HVM_PARAM_DM_DOMAIN, DOMID_SELF);
 #endif