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xen-users
Re: [Xen-users] Video output/graphics in virtualized OSs
M.A. Williamson wrote:
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.
From which follows that it should - at some point in the future - be
possible to use a mobo with onboard video for dom0, and a PCIx card in
at least one domU, or maybe even more PCIx cards for different domU's?
--
Kind regards,
Mogens Valentin
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