[Xen-users] Second Dom0-like DomU with graphics hardware access

[Paul Schulze <avlex@xxxxxxx>]

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Hey everyone,

First, I think I just more or less succeeded on passing my primary  
(and only) graphics card, an onboard ATI Radeon HD3200, through to a  
DomU. Or at least there is no error message stating otherwise, when I  
start the DomU and the device is shown when lspci is used. Before  
someone gets too excited, Xorg still complains about not finding the  
device and the output from booting the Xen kernel is still the only  
thing, displayed on the connected monitor.
Now the first question is, does anyone have an idea on how to prevent  
Xen from grabbing and writing its output to the VGA hardware, if it  
should already have a serial console to work with? I am assuming,  
that even if I have the kernel output to the serial console and have  
pciback hide the graphics card, Xen still hands the graphics card  
directly to the Dom0, if it shows its messages on one and the kernel  
grabs it, even if it isn't needed for output. This might cause Xorg  
in the DomU not to find the device. If this isn't the problem here,  
does anyone have any ideas on what is going wrong?
The second question is, does anyone know if it is possible to have  
PS2 devices (aka. keyboard and mouse) exclusively assigned to one  
DomU? I would really like to separate the VM, controlling Xen and my  
desktop VM for various reasons (f.e. to not have to restart every  
DomU along with the Dom0, if the desktop system receives an update,  
security and so on). Since I can use the serial console from another  
device to control Xen (or use SSH), I really don't need keyboard and  
mouse in the Dom0 and having PS2 support in the Desktop DomU would be  
just nice, especially since I'm a little short on USB input devices  
right now, so the USB controllers, I passed to the same DomU aren't  
much help.
And the third problem, I am facing at the moment, I still don't get  
the boot output or any login prompt on the connected monitor,  
probably because the TTYs are fake in a Xen DomU. Is there a way to  
have these connect to the real VGA adapter instead?
Thanks,


Paul.

P.S.: To round up the crazy stuff, if anyone knows a way to intercept  
signals from the power button in Dom0, Id like to know. Would be nice  
if I could start up and shutdown the Desktop DomU like that.
- --
Paul Schulze
avlex@xxxxxxx
Public Key: http://solaris-net.dyndns.org/keys/key_avlex.asc

"Making mistakes is human,
but to really fuck things up you need Computers"


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