Xen users - Oct 2011 - xen-pciback.passthrough=1 doesn't perserve the pci topology in domU

Hi

I am trying to passthrough a graphic card and some other devices to a Windows 7
domU, and am hence trying to preserve the pci topology, but it is not working.

Some info about the setup:

I have compiled a 3.1 kernel from the main tree, with all xen releated options
except, some debug features, compiled into the kernel (no modules). I have also
compiled xen from the xen-unstable branch it is version 4.2 with changeSet: Thu
Oct 20 15:36:01 2011 +0100 23981:6c583d35d76d.

I boot the kernel with parameter xen-pciback.passthrough=1 to keep the pci
topology in the domU, and when calling
Dmesg | grep passthrough I get:

xen-pciback: backend is passthrough

indicating that the right passthrough mode is selected. But my graphic card is
01:00.0 and when checking it in device manager in windows it is found as
00:08.0.

Can someone please tell me what I am doing wrong?

Best regards Kristian Hagsted




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On Sun, Oct 30, 2011 at 01:52:24PM +0100, Kristian Hagsted Rasmussen
wrote:
>    Hi
> 
Hello,

I added xen-devel as CC.
> 
> 
>    I am trying to passthrough a graphic card and some other devices to a
>    Windows 7 domU, and am hence trying to preserve the pci topology, but it
>    is not working.
> 
> 
> 
>    Some info about the setup:
> 
> 
> 
>    I have compiled a 3.1 kernel from the main tree, with all xen releated
>    options except, some debug features, compiled into the kernel (no
>    modules). I have also compiled xen from the xen-unstable branch it is
>    version 4.2 with changeSet: Thu Oct 20 15:36:01 2011 +0100
>    23981:6c583d35d76d.
> 
> 
> 
>    I boot the kernel with parameter xen-pciback.passthrough=1 to keep the
pci
>    topology in the domU, and when calling
> 
>    Dmesg | grep passthrough I get:
> 
> 
> 
>    xen-pciback: backend is passthrough
> 
> 
> 
>    indicating that the right passthrough mode is selected. But my graphic
>    card is 01:00.0 and when checking it in device manager in windows it is
>    found as 00:08.0.
> 
> 
> 
>    Can someone please tell me what I am doing wrong?
> 
Hmm.. so in dom0 the graphics card shows as 01:00.0 ? 
Please paste your whole grub configuration.

Is xen-pciback built-in to the kernel, or is it a module? 

-- Pasi


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