uvm_fault_upper_upgrade
error = uvm_fault_upper_upgrade(ufi, flt, amap, NULL);
error = uvm_fault_upper_upgrade(ufi, flt, amap, NULL);
error = uvm_fault_upper_upgrade(ufi, flt, amap, NULL);
error = uvm_fault_upper_upgrade(ufi, flt, amap, uobj);