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

[Kristian Hagsted Rasmussen <kristian@xxxxxxxxxx>]

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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