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Since the macvtap device needs active tear-down and the teardown logic is based on the interface name, it can happen that if for example 1 out of 3 interfaces was successfully created, that during the failure path the macvtap's target device name is used to tear down an interface that is doesn't own (owned by another VM). So, in this patch, the target interface name is reset so that there is no target interface name and the interface name is always cleared after a tear down.
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>