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Re: [Xen-users] X server in a domU, with pci access and no X in dom0

To: nicko.koinkoin@xxxxxxx
Subject: Re: [Xen-users] X server in a domU, with pci access and no X in dom0
From: Adam Seering <aseering@xxxxxxxxx>
Date: Tue, 22 Aug 2006 21:33:17 -0400
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Hi,
Right now, in order for graphics cards to work properly, their X drivers have to be modified to recognize Xen. I don't think this has been done for any open-source graphics card drivers; there is a way to get the NVidia binary module to work, but it requires a fair bit of Googling and kernel and module patching, and things like that. I was able to follow the instructions at <http://www.nvnews.net/ vbulletin/showthread.php?t=68703>, and with some tweaking I did get a graphics card to work.

Note that the domU doesn't have physical access to your hardware. This means, No keyboard and mouse, unless you have a PCI USB card and you export that card to your domU as well, and configure X to use them.

Adam


On Aug 22, 2006, at 11:02 AM, nicko.koinkoin@xxxxxxx wrote:

Hi everybody

I try to have a running X server in a domU.

What I want is not to have an X server in dom0, for security purposes. I know that it is not an easy thing, but I need it. First I hide the video card from dom0, what is working fine. Indeed, lspci in dom0 doesn't show the video card.

I give direct access to the video card to my domU, thanks to its configuration file. But in fact I can't launch my X server. Indeed, during the boot of my
domU, I got the following error message :

 * Loading key mappings ...assuming iso-8859-1 cedilla
assuming iso-8859-1 acute
assuming iso-8859-1 diaeresis
assuming iso-8859-1 brokenbar
assuming iso-8859-1 threequarters
assuming iso-8859-1 currency
assuming iso-8859-1 onehalf
assuming iso-8859-1 onequarter
assuming iso-8859-1 currency
Couldnt get a file descriptor referring to the console

 * Error loading key mappings
[ !! ] * Setting terminal encoding to ASCII ... [ ok ]
 * Setting user font ...Couldnt open //dev/vc/1
Couldnt open //dev/vc/2
Couldnt open //dev/vc/3
Couldnt open //dev/vc/4
Couldnt open //dev/vc/5
Couldnt open //dev/vc/6
Couldnt open //dev/vc/7
Couldnt open //dev/vc/8
Couldnt open //dev/vc/9
Couldnt open //dev/vc/10
Couldnt open //dev/vc/11

 * Failed to set user font
[ !! ]

So of course when typing startx, I got :

Fatal server error:
xf86OpenConsole: Cannot open /dev/tty0 (No such device)

I use Gentoo Linux with kernel 2.4.30 as my domU (the same for dom0, but there is no error messages during dom0 boot), the configuration file of my domU is:

kernel  = "/boot/vmlinuz-2.4.30-xenU-basic"

memory  = 128

name    = "domU"

nics    = 1

vif = ['mac=aa:00:00:00:00:d2, bridge=xen-br0']

disk = ['phy:/dev/hda5,hda1,w',
        'phy:/dev/hda6,hda2,w']

root = "/dev/hda1 ro";

#extra="xencons=ttyS console=tty0"
extra="console=tty0"

pci=['02,00,0']

I also try to append the same options to my domU kernel as the ones of dom0, but
thus no console is available during boot, so no display at all.
Please let's me know if what I try is a crazy thing, or if someone has already suceeded in having a running and usable X server in a domU with no X in dom0,
or if it can be a Gentoo specific error due to devfs.

Thanks a lot.

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