Re: [Xen-users] PCI passthrough to Windows XP

[Daniel Shub <Daniel.Shub@xxxxxxxxxxxxxxxx>]

> > > > #grep hide /boot/grub/grub.cfg
> > > >
> > > > Returns two lines of
> > > >
> > > > multiboot /boot/xen-4.0-amd64.gz placeholder
> > > > xen-pciback.hide(05:00.0)(06:04.0)
> > Shouldn't this line be on the kernel line in grub and not the xen.gz
> line?
> > In my understanding it is the xen-pciback module in the linux kernel
> who does the hiding.
> 
> I missed this -- you are absolutely correct that this option should be
> passed to the dom0 kernel.
> 
> If using update-grub with the standard grub.d snippets hten it should
> be added /etc/default/grub in the GRUB_CMDLINE_LINUX_XEN_REPLACE or
> GRUB_CMDLINE_LINUX_XEN_REPLACE_DEFAULT. Or
> GRUB_CMDLINE_LINUX_DEFAULT/GRUB_CMDLINE_LINUX would work (and be
> harmless, I think, when booting native).
> 
> GRUB_CMDLINE_XEN_DEFAULT and GRUB_CMDLINE_LINUX_DEFAULT are both the
> wrong place to add this new option.
> 
I am confused. At first you say GRUB_CMDLINE_LINUX_DEFAULT "would work (and be 
harmless)", but then say it is "the wrong place to add this new option".
Adding to GRUB_CMDLINE_LINUX_XEN_REPLACE or 
GRUB_CMDLINE_LINUX_XEN_REPLACE_DEFAULT doesn't work (nothing gets added to 
/boot/grub/grub.cfg). Adding to GRUB_CMDLINE_LINUX results in 

#grep hide /boot/grub/grub.cfg
        module  /boot/vmlinuz-2.6.32-5-xen-amd64 placeholder 
root=UUID=2c69309c-05ce-4e2d-b9f9-d651e65342ae ro 
xen-pciback.hide(05:00.0)(06:04.0) quiet
        module  /boot/vmlinuz-2.6.32-5-xen-amd64 placeholder 
root=UUID=2c69309c-05ce-4e2d-b9f9-d651e65342ae ro single 
xen-pciback.hide(05:00.0)(06:04.0)
        linux   /boot/vmlinuz-2.6.32-5-xen-amd64 
root=UUID=2c69309c-05ce-4e2d-b9f9-d651e65342ae ro 
xen-pciback.hide(05:00.0)(06:04.0) quiet
        linux   /boot/vmlinuz-2.6.32-5-xen-amd64 
root=UUID=2c69309c-05ce-4e2d-b9f9-d651e65342ae ro single 
xen-pciback.hide(05:00.0)(06:04.0)
        linux   /boot/vmlinuz-2.6.32-5-amd64 
root=UUID=2c69309c-05ce-4e2d-b9f9-d651e65342ae ro 
xen-pciback.hide(05:00.0)(06:04.0) quiet
        linux   /boot/vmlinuz-2.6.32-5-amd64 
root=UUID=2c69309c-05ce-4e2d-b9f9-d651e65342ae ro single 
xen-pciback.hide(05:00.0)(06:04.0)

but I am still unable to use the pci passthrough.

At this point I am still not sure that the Debain Squeeze kernel supports 
xen-pciback or if I need to load a module. I also do not know if I should be 
using xen-pciback or just pciback (I have been trying everything with both).

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