$ qemu-system-arm xxxxxxxx -monitor telnet::5555,server,nowait
$ telnet localhost 5555 Trying ::1... Connection failed: Connection refused Trying 127.0.0.1... Connected to localhost. Escape character is ‘^]‘. QEMU 0.10.50 monitor - type ‘help‘ for more information (qemu)
(qemu) "ctrl+]" to return to telnet, (qemu)"quit" to exit qemu applicatoin.
(qemu) "system_reset" to reset machine, (qemu) "system_powerdown" to turn off the machine.
Control my qemu in telnet (system_reset, system_powerdown)
原文：http://www.cnblogs.com/kozmers/p/4198420.html