libvirt users - Oct 2011 - Usage serial device

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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 ?

Unfortunately, I must use libvirtd 0.7.5 for now... I'm aware that it might
be a
version issue here but still...

Thanks!
David
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On Mon, Oct 03, 2011 at 03:53:50PM -0400, David Goulet
wrote:
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> Hash: SHA1
> 
> 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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