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Re: [Libvir] PATCH: Fix paravirt FB with xm driver

On Fri, Aug 10, 2007 at 05:16:28PM +0100, Richard W.M. Jones wrote:
> Daniel P. Berrange wrote:
> >The code for dealing with the paravirt framebuffer was missing code to deal
> >with an explicit vncdisplay=N  setting - only working for vncunused=1. It
> >was also not flexible enough in processing the 2 different styles of FB
> >config.
> I too am having trouble following the explanation / code.  Can you 
> explain a bit more ...?

Two core issues

For paravirt the framebuffer can be configured in either old style:


Or new style

   vfb = ["type=vnc,vncunused=1"

The problem was that with Xen > 3.0.3 we were only handling the latter
and not the former. We needed to process both styles for compatability.

The second part of it is that while we handled

   <graphics type='vnc' port='-1' />

Converting to 'vncunused=1'.  We did not handle

   <graphics type='vnc' port='5905' />

Which needs to convert to vncunused=0, and vncdisplay=5

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