Re: [Xen-users] VNC console access in paravirtualized domUs

[jim burns <jim_burn@xxxxxxxxxxxxx>]

On Friday June 06 2008 07:30:44 am you wrote:
> The tip about hvc0/xvc0 was helpful in getting Debian Lenny going; for
> grins I decided to spin an image of Lenny to assist in
> troubleshooting.  Regarding the framebuffer (using Lenny for
> reference), I've got the xorg fbdev package installed.  I've added a
> section to xorg.conf like:
>
> Section "Device"
>          Identifier "vnctest"
>          Driver "fbdev"
> EndSection

Here's my F9 pv xorg.conf:

# Xorg configuration created by system-config-display

Section "ServerLayout"
        Identifier     "single head configuration"
        Screen      0  "Screen0" 0 0
        InputDevice    "Keyboard0" "CoreKeyboard"
EndSection

Section "InputDevice"
        Identifier  "Keyboard0"
        Driver      "kbd"
        Option      "XkbModel" "pc105"
        Option      "XkbLayout" "us+inet"
EndSection

Section "Device"
        Identifier  "Videocard0"
        Driver      "fbdev"
EndSection

Section "Screen"
        Identifier "Screen0"
        Device     "Videocard0"
        DefaultDepth     24
        SubSection "Display"
                Viewport   0 0
                Depth     24
        EndSubSection
EndSection

In particular, note how the last two sections relate to each other - The 
identifier you associate with the fbdev driver has to be specified in the 
Screen section.

> But as far as I can tell, the issue is that the domU does not expose
> the framebuffer to the dom0:
>
> XENBUS: Device with no driver: device/vkbd/0
> XENBUS: Device with no driver: device/vfb/0
> XENBUS: Device with no driver: device/console/0

I've seen this many times on this list, and on my own pv domus, and I think 
they are just pre-initialization messages - an indication that xen is about 
to look for drivers. Anybody know any differently?

> I believe that's why I see "parallel0 console" in VNC.  There is no
> /dev/fb0 on the domU (docs make reference to this; I've got to believe
> udev would throw it up if it were configured properly).  Any ideas
> there?

With no more than the above xorg.conf, the output of 'ls -alF /dev/fb*' for me 
is:

lrwxrwxrwx 1 root root     3 2008-05-26 17:21 /dev/fb -> fb0
crw------- 1 jimb root 29, 0 2008-06-06 18:05 /dev/fb0

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