[Qemu-devel] Monitor

[Qemu-devel] Monitor

[Michael Fisher]

1. Can the commands (i.e. sendkeys, savevm, loadvm) be initiated from
within the guest OS? If so, can you give me an example?

2. When executing 'savevm' can it be saved to a virtual disk?

Thanks,

desNotes

[Qemu-devel] Re: Monitor

[Anthony Liguori]

On Sat, 15 Jul 2006 17:51:39 -0400, Michael Fisher wrote:

> 1. Can the commands (i.e. sendkeys, savevm, loadvm) be initiated from
> within the guest OS? If so, can you give me an example?

No.

> 2. When executing 'savevm' can it be saved to a virtual disk?

No.

Regards,

Anthony Liguori

> Thanks,
> 
> desNotes

Re: [Qemu-devel] Monitor

[NyOS]

On Sat, 15 Jul 2006 23:51:39 +0200, Michael Fisher <desnotes@gmail.com>  
wrote:

> 1. Can the commands (i.e. sendkeys, savevm, loadvm) be initiated from
> within the guest OS? If so, can you give me an example?
Of course, by its nature, not. A good emulator cannot allow that.
However, - if you configure your system well - it is possibile with  
external programs:
Launch qemu with network support, use a named pipe as monitor, and do  
something on the host to grant guest some access (launch sshd for instance  
and install ssh client on guest)
mknod monitor.pipe p <-- this line creates a new named pipe, called  
"monitor.pipe"
qemu -hda disc.img -monitor pipe:monitor.pipe -net nic -net user <-- use  
monitor.pipe as monitor.. note that you cannot reach original monitor  
(alt-ctr-2) this way

connect to host from inside, and use "echo 'command' > monitor.pipe"

It sounds quite useless.. but it isn't if you use a GNU netcat (nc) server  
on host, which listens on a tcp/ip port.. That way, a simple telnet  
program could be used as a terminal from inside (I mean from guest)

nc -T -l -t -p 8898 >monitor.pipe

(There might be some patches around that make possibile to use a tcp/ip  
server as a monitor/serial/parallel device..)

>
> 2. When executing 'savevm' can it be saved to a virtual disk?
By default, not.
With the same trick, you can ask the host to make some VM saves, and then  
fetch it through scp/ftp/samba/whatever you want

>
> Thanks,
>
> desNotes
>

Best regards,

Nyos