Xen pci passthrough: PCI Backend and pci-stub don't own sibling device 0000:00:00.0

[Mark Hurenkamp]

When starting a xen virtual machine with pci-passthrough of my pci cards, it complains about xen pciback not owning the device 0000:00:00.0, but it is not supposed to own that device (since it is the pci root).
I found someone reporting this, and providing a workaround (probably not a real solution) in the following mailinglist post(s):

Problem:
http://osdir.com/ml/xen-users/2011-04/msg00207.html

Workaround:
http://osdir.com/ml/xen-users/2011-04/msg00210.html

Note: I'm running ubuntu 12.04, and have done a update & upgrade today.

root@hoth:/usr/lib/xen-4.1/lib/python/xen/xend/server# apt-cache policy xen-tools xen-utils-4.1 xen-hypervisor-4.1-i386
xen-tools:
  Installed: (none)
  Candidate: 4.2.1-1
  Version table:
     4.2.1-1 0
        500 http://nl.archive.ubuntu.com/ubuntu/ precise/universe amd64 Packages
xen-utils-4.1:
  Installed: 4.1.2-2ubuntu1
  Candidate: 4.1.2-2ubuntu1
  Version table:
 *** 4.1.2-2ubuntu1 0
        500 http://nl.archive.ubuntu.com/ubuntu/ precise/universe amd64 Packages
        100 /var/lib/dpkg/status
xen-hypervisor-4.1-i386:i386:
  Installed: (none)
  Candidate: 4.1.2-2ubuntu1
  Version table:
     4.1.2-2ubuntu1 0
        500 http://nl.archive.ubuntu.com/ubuntu/ precise/universe i386 Packages

root@hoth:/usr/lib/xen-4.1/lib/python/xen/xend/server# apt-cache policy linux-image
linux-image:
  Installed: (none)
  Candidate: 3.2.0.17.17
  Version table:
     3.2.0.17.17 0
        500 http://nl.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[alex (hackroute)]

PCI1_slot - 09:00.0: via gigabite net
PCI2_slot - 09:01.0: texas instrument firewire

in config for create with xm a VM:
pci = [ '09:00.0', '09:01.0' ]

i have this message (Xen pci passthrough: PCI Backend and pci-stub don't own sibling device 0000:00:00.0)

when in config pci string have only one pci_slot_device then xm successful creating a VM)
vith pci = [ '09:00.0' ] - ok
or pci = [ '09:01.0' ] - ok

asrock x79 extreme6 / i7-3930k
debian Wheezy (testing)
kernel 3.4.0-xen
xen 4.1 (xen-hypervisor-amd64 xen-tools)