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Unmanaged devices, as the name suggests, are not detached automatically from the host by libvirt before being attached to a guest: it's the user's responsability to detach them manually beforehand. If that preliminary step has not been performed, the attach operation can't complete successfully. Instead of relying on the lower layers to error out with cryptic messages such as error: Failed to attach device from /tmp/hostdev.xml error: Path '/dev/vfio/12' is not accessible: No such file or directory prevent the situation altogether and provide the user with a more useful error message.
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>