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Unmanaged devices are attached to guests in two steps: first, the device is detached from the host and marked as inactive; subsequently, it is marked as active and attached to the guest. If the daemon is restarted between these two operations, we lose track of the inactive device. Steps 5 and 6 of virHostdevPreparePCIDevices() already subtly take care of this situation, but some planned changes will make it so that's no longer the case. Plus, explicit is always better than implicit.
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>