I noticed a similar problem when upgrading another ubuntu-maverick hvm to 
oneiric.
This time it seems to be due to passing through the uhci & ehci devices.
(i tried to determine wether it is due to a single device, but any one of these 
seems
to cause problems for me)

Configuration:
===========
kernel = '/usr/lib/xen/boot/hvmloader'
builder = 'hvm'
memory = '1000'
device_model='/usr/lib/xen/bin/qemu-dm'
serial='pty'
disk = [   'phy:/dev/vm/cularin-oneiric,hda,w' ]
name = 'cularin'
vif = [ 'mac=aa:20:00:00:02:17, bridge=loc' ]
boot='c'
vfb = [ 'vnc=1,vnclisten=0.0.0.0,vncdisplay=7' ]
usb=1
usbdevice='tablet'
monitor=1
pci = [
    '0000:08:01.0', # uhci_hcd: hauppauge pvr 500 #1
    '0000:08:01.2', # ehci_hcd: hauppauge pvr 500 #1
    '0000:08:02.0', # uhci_hcd: hauppauge pvr 500 #2
    '0000:08:02.2', # ehci_hcd: hauppauge pvr 500 #2
]

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https://bugs.launchpad.net/bugs/860175

Title:
  passthrough snd_hda_intel to oneiric hvm breaks xen pvops drivers

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