[libvirt-users] Usage serial device

[Daniel P. Berrange]

On Mon, Oct 03, 2011 at 03:53:50PM -0400, David Goulet wrote:
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> Hi,
> 
> I'm trying to connect the *same* serial device to two KVM Linux machines where
> one is running KGDB and the other uses the connected serial to interact with the
> target machine running under KGDB.
> 
> However, I'm unable to do so. Using a pty port, I am able to use my kgdb setup
> with host/VM but unable to make it work with VM/VM since it's two different pty
> created on the two machines.
> 
> Anyone on this list can help me with that kind of setup ?

You don't really want to use PTYs to connect 2 VMs together.
Instead try using one of the TCP or UDP connection methods

  http://libvirt.org/formatdomain.html#elementsCharTCP

eg, configure one VM with

    <serial type="tcp">
      <source mode="bind" host="127.0.0.1" service="2445"/>
      <protocol type="raw"/>
    </serial>

and the other with

    <serial type="tcp">
      <source mode="connect" host="127.0.0.1" service="2445"/>
      <protocol type="raw"/>
    </serial>


Regards,
Daniel
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