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Re: [Xen-users] PCI Passthrough

On Wed, 2006-03-01 at 04:24 +0000, Alex.Pearson@xxxxxxxxxxxxxxxxx wrote:
> Grub config:
> title Xen 3.0 / XenLinux 2.6.12
>         root (hd0,0)
>         kernel /xen.gz dom0_mem=131072 com1=115200,8n1
>         module /vmlinuz-2.6.12-xen0 root=/dev/hda2 ro console=ttyS0, 115200
> pciback.hide=(0000:00:1d.0)(0000:00:1d.2)(0000:00:02.0)(0000:00:1f.3)
> Dmsg output:
> itops10:/boot/grub# dmesg | grep Unk
> Unknown boot option
> `pciback.hide=(0000:00:1d.0)(0000:00:1d.2)(0000:00:02.0)(0000:00:1f.3)':
> ignoring
> Non of the devices are hidden when i do a lspci
> I'm assuming this is because i'm doing something wrong, if i try to start a
> machine regardless then i get the following, however i assume this is
> because the hosts not configured:
> itops10:/boot/grub# grep pci /etc/xen/itops9
> pci = ['00:02.0','00:1f.3','00:1d.2','00:1d.0']
> itops10:/boot/grub# xm create itops9
> Using config file "/etc/xen/itops9".
> Error: Invalid pci specifier: 00:02.0
> Any help would be much appreciated, i know someone on the list has got this
> working, but could find any articles relating to any problems like this :-(
> Am i missing some kernel modules?  Which ones, i've had a good look through
> and can't find any obvious candidates

Are you compiling Xen from the xen-unstable mercurial tree or from a
release tarball? Based on the fact that you're using a 2.6.12 kernel, I
don't think the version of Xen/XenLinux that you're using has the PCI
passthrough code in it (it was added relatively recently to
xen-unstable, I think when 2.6.16-rc2 was the current version of
XenLinux). It's not in any of the Xen 3.0.x releases so far. If you're
compiling from xen-unstable, you need a changeset >= 8867.

If I'm wrong about the version of Xen/XenLinux that you're using, you
need to make sure that the pciback (CONFIG_XEN_PCIDEV_BACKEND) module is
compiled into the dom0 kernel and the pcifront
(CONFIG_XEN_PCIDEV_FRONTEND) module is compiled into the domU kernel.
They'll also happily live together in the same kernel if you use the
same kernel for your dom0 and your domU.


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