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[Xen-users] domU device access : kernel problem

  • To: <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: "Waeyenbergh, Sven" <Sven.Waeyenbergh@xxxxxxxxxxxxxx>
  • Date: Thu, 3 Nov 2005 17:53:00 +0100
  • Delivery-date: Thu, 03 Nov 2005 16:57:41 +0000
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: AcXglwrACD2jOpKESjOnH4/xnORlBQ==
  • Thread-topic: domU device access : kernel problem

Hi all,

I have a little question about a problem i'm experiencing with the new xen 

I installed in on a debian box, dom0 starts with no problem, also the domains i 
copied over from my 2.0.6 box start rightaway

i needed a custom kernel (i want to play with PCI device acces in domU) so i 
grabbed the 2.0.7 source
and compiled the 2.6.11-domU kernel (with the standard config) and tried 
booting one of my 2.0.6 systems.
result : 
debian:/mnt/temp/xen/xenU/xen-2.0/linux-2.6.11-xenU# xm create  /etc/xen/mythtv 
Using config file "/etc/xen/mythtv".
Started domain mythtv, console on port 9618
************ REMOTE CONSOLE: CTRL-] TO QUIT ********

************ REMOTE CONSOLE EXITED *****************

.... eg : nothing at all
this domain tries to boot from hda1 (lvm backed on dom0) and works fine with 
the kernel from 2.0.6

I noticed that in the default .config, the "CONFIG_XEN_PHYSDEV_ACCESS" was 
selected, so i tried disabling that
and recompiled. Now the system comes up with no problems, but obviously, i have 
no access to my PCI device.

Is there anything else i need to do besides:
1. hiding the pci's from dom0 by specifing the pci = [ x,y,z ] in the config 
file and the physdev_dom0_hide option for xen-2.0.gz
2. enabling CONFIG_XEN_PHYSDEV_ACCESS for the domU kernel
3. including the correct drivers in the domU kernel 

Do any of you see a reason why my kernel would not come up if i enable 

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