Xen users - Mar 2007 - PCI NIC passthrough problem with RH 2.6.19 kernel

Hi,

I have a perfectly running Xen 3.0.4 installation with kernel 2.6.16-42 with 
PCI passthrough for my internet interface (ethernet).
But with I boot my 2.6.19 xen kernel on dom0, I''m unable to have the
NIC
working in domU. I can see the NIC both in domU and dom0 with lspci. All 
other network interfaces are working correctly (ethernet in dom0 and 
bridges).


Here is my entry in grub :

title  Xen-3.0.4
root (hd0,0)
kernel /xen-3.0.4-1.gz dom0_mem=768M
module /vmlinuz-2.6.19.2-dom0 root=/dev/md3 CONSOLE=/dev/tty1 noreboot 
pciback.permissive pciback.hide=(00:0b.0)

Here is my xen config for this host :

# burns gw
kernel = "/usr/local/xen/boot/vmlinux-2.6-xen-tc-domU"
#kernel = "/usr/local/xen/boot/vmlinuz-2.6.19-xen-domU"
memory = 96
name = "burns"
vif = [ ''mac=00:16:3E:78:14:8F,
bridge=br0'',''mac=00:11:25:8D:3E:EA,
bridge=br1'' ]
disk = 
[''phy:/dev/homervg/burns_sda1,sda1,w'',
''phy:/dev/homervg/burns_sda2,sda2,w'']
root = "/dev/sda1 ro"
extra = "gentoo=nodevfs"
pci = [ ''00:0b.0'' ]


- 00:0b.0 if the PCI address of my NIC. (Realtek 8139)
- the driver is compiled into the kernel.
- I tried with both 2.6.16 and 2.6.19 as kernel domU
- an ifconfig eth0 in domU show the nic, but dhcpcd do not get the IP from the 
cable modem.

What should I do ?

Regards,


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