In the VM/XA Migration Aid, a state, controlled by the current PSW of a virtual machine, during which the control program allows the virtual machine to issue in put/output and other privileged instructions. The control program interrupts these instructions and simulates the functions of these instructions for the virtual machine.; 虛機擴充結(jié)構(gòu)遷移輔助操作系統(tǒng)(VM/XA Migration Aid)中的一種狀態(tài)，它由虛 機現(xiàn)行程序狀態(tài)字(PSW)控制。在此狀態(tài)下，控制程序允許虛機發(fā)送輸入輸出指令和其 它特權(quán)指令，但這些指令被控制程序截獲，并由它為虛機模擬這些指令的功能。