On 21.05.2015 12:33, Umer Khan wrote: http://wiki.libvirt.org/page/Qemu_guest_agent After you've set up the guest agent (both in libvirt and in guest), you can passtrhough an arbitrary guest agent commands too: http://git.qemu.org/?p=qemu.git;a=blob;f=qga/qapi-schema.json;h=b446dc729... Although I should warn you that qemu-ga does not allow arbitrary OS command execution. To do that you'd need to use a console. I think virsh is a good example on that: http://libvirt.org/git/?p=libvirt.git;a=blob;f=tools/virsh-console.c;h=f0... Long story short, you create a new stream @st by calling virStreamNew(). Then you open a console and connect the stream onto it: virDomainOpenConsole(dom, dev_name, st, flags); then you register two events into the event loop, one to watch if STDIN is readable (= has some data to send = somebody typed something), the other to watch if STDOUT is writable (it can be redirected to a file or whatever, which is not necessarily always writable). The third event you register is to handle the stream. This is the idea: streamEvent() { if (stream_readable) { read data from stream into terminal buffer make STDOUT handler listen to writable event } if (stream_writable and stream buffer != empty) { send data to stream from stream buffer } if (terminal buffer == empty) make stream handler listen to readable event } stdin_event() { read data from STDIN into stream buffer make stream handler listen to readable | writable event } stdout_event() { write data from terminal buffer to STDOUT if (terminal buffer == empty) temporarily disable stdout handler } I hope this makes it something clearer. Michal