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

  • To: "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: Kristian Hagsted Rasmussen <kristian@xxxxxxxxxx>
  • Date: Sun, 30 Oct 2011 13:52:24 +0100
  • Accept-language: da-DK
  • Acceptlanguage: da-DK
  • Delivery-date: Sun, 30 Oct 2011 06:21:58 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: AcyXAhs4/rQWIk+QRpyXX7pSdvhbgg==
  • Thread-topic: xen-pciback.passthrough=1 doesn't perserve the pci topology in domU



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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