FYI, at least on my Fedora 10 system, "make check" gets one failure: 52) QEMU XML-2-ARGV hostdev-pci-address ... Failed to open file '/sys/bus/pci/devices/0000:06:12.5/vendor': No such file or directory Failed to open file '/sys/bus/pci/devices/0000:06:12.5/device': No such file or directory libvir: error : this function is not supported by the hypervisor: Failed to read product/vendor ID for 0000:06:12.5 FAILED It's true, the containing directory doesn't exist: $ ls -1 /sys/bus/pci/devices/0000* /sys/bus/pci/devices/0000:00:00.0@ /sys/bus/pci/devices/0000:00:02.0@ /sys/bus/pci/devices/0000:00:02.1@ /sys/bus/pci/devices/0000:00:03.0@ /sys/bus/pci/devices/0000:00:19.0@ /sys/bus/pci/devices/0000:00:1a.0@ /sys/bus/pci/devices/0000:00:1a.1@ /sys/bus/pci/devices/0000:00:1a.2@ /sys/bus/pci/devices/0000:00:1a.7@ /sys/bus/pci/devices/0000:00:1b.0@ /sys/bus/pci/devices/0000:00:1c.0@ /sys/bus/pci/devices/0000:00:1c.1@ /sys/bus/pci/devices/0000:00:1c.2@ /sys/bus/pci/devices/0000:00:1c.3@ /sys/bus/pci/devices/0000:00:1c.4@ /sys/bus/pci/devices/0000:00:1d.0@ /sys/bus/pci/devices/0000:00:1d.1@ /sys/bus/pci/devices/0000:00:1d.2@ /sys/bus/pci/devices/0000:00:1d.7@ /sys/bus/pci/devices/0000:00:1e.0@ /sys/bus/pci/devices/0000:00:1f.0@ /sys/bus/pci/devices/0000:00:1f.2@ /sys/bus/pci/devices/0000:00:1f.3@ /sys/bus/pci/devices/0000:03:00.0@ /sys/bus/pci/devices/0000:06:00.0@ /sys/bus/pci/devices/0000:06:03.0@ $ readlink /sys/bus/pci/devices/0000:00:1c.4 ../../../devices/pci0000:00/0000:00:1c.4 I'll look into it in about 30 minutes.