[libvirt] How to use a Virtio-serial port

[Michal Privoznik]

On 15.05.2012 09:06, Pankaj Rawat wrote:
> Hi all,
> 
>  
> 
> I want to use virtio-serial
> 
> For this I changes my  guest xml
> 
> <channel type='pty'>
> 
>       <target type='virtio' name='arbitrary.virtio.serial.port.name'/>
> 
>  </channel>
> 
>  
> 
> This create a virtio port in guest as follow
> 
>  
> 
> # ls -l /dev/virtio-ports/
> 
> lrwxrwxrwx. 1 root root 11 May 15 02:59
> arbitrary.virtio.serial.port.name -> ../vport0p1
> 
>  
> 
> Now I want to use this port
> 
> What type of application use this port for communication and how can I
> use it ?
> 

When you start your domain and then dump its XML it will look like this:

    <channel type='pty'>
      <source path='/dev/pts/12'/>
      <target type='virtio' name='arbitrary.virtio.serial.port.name'/>
      <alias name='channel0'/>
      <address type='virtio-serial' controller='0' bus='0' port='2'/>
    </channel>

So one end of the channel is inside the domain under
/dev/virtio-ports/arbitrary.virtio.serial.port.name and the other one is
under /dev/pts/12 in the host. Therefore running:

(guest) cat /dev/virtio-ports/arbitrary.virtio.serial.port.name
(host) echo "Hello world" > /dev/pts/12

will do all the magic. You can use any tool that is able to work with
unix domain sockets. I personally use socat [1].

1: http://www.dest-unreach.org/socat/
>  
> 
> Regards
> 
> Pankaj Rawat
> 
>  
> 
> 
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