Re: [Xen-users] Uninitialized hardware under Xen Client?

[Andy Burns <lists.xensource.com@xxxxxxxxxxxxxx>]

On 05/07/2008 08:54, Kenneth Andresen wrote:

> I would like to know if a
> Xen client can use Firewire without it being supported by the host system?
>
> lspci is listing the firewire as:
> 07:03.0 FireWire (IEEE 1394): VIA Technologies, Inc. IEEE 1394 Host
> Controller (rev c0)
Yes, you can use pciback and pcifront to pass the device from dom0 into 
a domU, where you can install a different kernel that does support the 
device.
the centos 5.2 xen kernels are built with pciback/pcifront, other distro 
xen kernels may vary.
On the dom0, in /etc/modprobe.conf add this (beware of line-wrapping on 
the install line)
options pciback hide=(0000:07:03.0)
install XXXXXX /sbin/modprobe pciback ; /sbin/modprobe --first-time 
--ignore-install XXXXXX
where XXXXXX is the driver which would normally load the device, 
essentially what it does is say where you'd normally load the driver for 
XXX, load pciback instead.
If the dom0 kernel doesn't have a driver for XXXXXX, then you can do it 
this way instead, but it will be required each boot so put it in 
/etc/rc.local or similar.
modprobe pciback
echo -n 0000:07:03.0 > /sys/bus/pci/drivers/pciback/new_slot
echo -n 0000:07:03.0 > /sys/bus/pci/drivers/pciback/bind


You will need to use the xmdomain.cfg style config file for your domU 
not a libvirt xml stykle config, you can then add the pci device
with a line e.g

pci = ['07:03.0']

When you boot the domU, it should the show the passthrough device with 
an lspci, and you can modprobe drivers for it if they aren't done 
automatically
You may need to use pollirq kernel parameter on dom0 if the device 
shares interrupts with other devices.
You may need swoitlb parameters to xen itself, or domU kernel if it does 
DMA transfers.


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