[Libvir] PATCH: Support serial & parallel devices in QEMU driver

Daniel P. Berrange berrange at redhat.com
Tue Apr 15 22:09:22 UTC 2008

On Wed, Apr 16, 2008 at 12:05:46AM +0200, Pau Garcia i Quiles wrote:
> Quoting "Daniel P. Berrange" <berrange at redhat.com>:
> Cool stuff. I've not read the patch because it's quite big but I've  
> got a couple of questions:
> > - Run a TCP  server and wait for clients to connect, using telnet
> >   protocol over wire:
> >
> >    <serial type='tcp'>
> >      <source mode='bind' host='' service='9999' 
> >      wiremode='telnet'/>
> >      <target port='0'/>
> >    </serial>
> >
> > - Run a TCP client connecting to a remote host to send data in
> >   raw format:
> >
> >    <serial type='tcp'>
> >      <source mode='connect' host='' service='9999' 
> >      wiremode='raw'/>
> >      <target port='0'/>
> >    </serial>
> 1) Is any of those two an implementation of RFC 2217? ("Telnet Com  
> Port Control Option")

See the docs on -serial telnet in QEMU for a precise description:


  "The telnet protocol is used instead of raw tcp sockets. The options
   work the same as if you had specified -serial tcp. The difference is
   that the port acts like a telnet server or client using telnet option
   negotiation. This will also allow you to send the MAGIC_SYSRQ sequence
   if you use a telnet that supports sending the break sequence. Typically
   in unix telnet you do it with Control-] and then type "send break" 
   followed by pressing the enter key."

> 2) Will all this serial port "flavors" be available for all drivers  
> (qemu, kvm, xen, etc) or will they all be available for Xen, then only  
> some for the other drivers?

KVM is part of the QEMU driver so yes. And I already mentioned that I intend
to add it to the Xen driver. Other drivers can use if it applicable - I
imagine the Solaris LDoms driver can use the TCP based syntax for its console

|: Red Hat, Engineering, Boston   -o-   http://people.redhat.com/berrange/ :|
|: http://libvirt.org  -o-  http://virt-manager.org  -o-  http://ovirt.org :|
|: http://autobuild.org       -o-         http://search.cpan.org/~danberr/ :|
|: GnuPG: 7D3B9505  -o-  F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|

More information about the libvir-list mailing list