libxl: remove qemu default devices for upstream qemu

Remove default devices created by qemu. Qemu will create only devices
defined by xen, since the devices not defined by xen are not usable.
Remove deleting of empty floppy no more needed with nodefault.

(Removed a whitespace error. -iwj)

Signed-off-by: Fabio Fantoni <fabio.fantoni@m2r.biz>
Acked-by: Anthony PERARD <anthony.perard@citrix.com>
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>

tools/libxl/libxl_dm.c

@@ -392,6 +392,13 @@ static char ** libxl__build_device_model_args_new(libxl__gc *gc,
     flexarray_append(dm_args, "-mon");
     flexarray_append(dm_args, "chardev=libxl-cmd,mode=control");
 
+    /*
+     * Remove default devices created by qemu. Qemu will create only devices
+     * defined by xen, since the devices not defined by xen are not usable.
+     * Remove deleting of empty floppy no more needed with nodefault.
+     */
+    flexarray_append(dm_args, "-nodefaults");
+
     if (b_info->type == LIBXL_DOMAIN_TYPE_PV) {
         flexarray_append(dm_args, "-xen-attach");
     }
@@ -457,9 +464,6 @@ static char ** libxl__build_device_model_args_new(libxl__gc *gc,
     if (b_info->type == LIBXL_DOMAIN_TYPE_HVM) {
         int ioemu_nics = 0;
 
-        /* Disable useless empty floppy drive */
-        flexarray_vappend(dm_args, "-global", "isa-fdc.driveA=", NULL);
-
         if (b_info->u.hvm.serial) {
             flexarray_vappend(dm_args, "-serial", b_info->u.hvm.serial, NULL);
         }