Re: [Xen-users] Video output/graphics in virtualized OSs

["M.A. Williamson" <maw48@xxxxxxxxx>]

> > How do the virtualized operating systems in XEN output video? I presume
> > at this point, it isn't completely transparent - where they are writing
> > to what they consider to be video memory and the display of that virtual
> > buffer is somehow managed by Dom0. If that's the case, then how at this
> > point is it handled? Specialized X Servers?
> Well, the answer is: It depends.
>
> For example, dom0 (yes, thats a virtualized OS, too) simply accesses your 
> VGA. domUs are textmode only as far as xen is concerned, they only got a 
> virtual terminal device. But since you have networking between them, you 
> can use the standard unix stuff to get graphical apps working in domU, 
> like X11, VNC, NX, ...
> Now if you were asking about unmodified guests running with help of the 
> next generation AMD/Intel CPUs, I think they'll have a emulated SVGA 
> card.
That's about all I was going to say ;-)

I should also mention that it's theoretically possible to give a domU 
access to a PCI video card and devote another physical monitor to the 
domain. Various people have fooled around with this; I'm not sure if it 
works *yet* because there are lots of fiddly things in the console / X.org 
subsystems that need to be right. Hopefully this will be fully functional 
some time soon.
Cheers,
Mark

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