[libvirt] How to use a Virtio-serial port

[Pankaj Rawat]

Hi,

Can Anyone please tell me if there is any option in virt-install by which we can specify this vitio-serial port

I mean I don't want to edit xml file and then define it as it is a post installation process.
I want to enable the virtio-serial port when I install the guest using virt-install

Regards
Pankaj Rawat

-----Original Message-----
From: Michal Privoznik [mailto:mprivozn at redhat.com]
Sent: Tuesday, May 15, 2012 2:14 PM
To: Pankaj Rawat
Cc: libvir-list at redhat.com
Subject: Re: [libvirt] How to use a Virtio-serial port

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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