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Save/restore with passed through USB devices currently only works if the USB device can be found at the same USB address where it used to be before saving a domain. This makes sense in case a user explicitly configure the USB address in domain XML. However, if the device was found automatically by vendor/product identification, we should try to search for that device when restoring the domain and use any device we find as long as there is only one available. In other words, the USB device can now be removed and plugged again or the host can be rebooted between saving and restoring the domain.
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>