const char *arch = qtest_get_arch();
char *tmp_path;
const char *cmd = "-drive if=none,id=drive0,file=%s,format=raw "
- "-drive if=none,id=drive1,file=/dev/null,format=raw "
+ "-drive if=none,id=drive1,file=null-co://,format=raw "
"-device virtio-blk-pci,id=drv0,drive=drive0,"
"addr=%x.%x";