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Since xen-3.3 an official unplug protocol for emulated hardware is available in the toolstack. The pvops kernel does the unplug per default, so it is safe to do it also in the drivers for forward ported xenlinux. Currently its required to load xen-platform-pci with the module parameter dev_unplug=all, which is cumbersome. Also recognize the dev_unplug=never parameter, which provides the default before this patch. Signed-off-by: Olaf Hering <olaf@aepfle.de>