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If a network is destroyed and restarted, or its bridge is changed, any tap devices that had previously been connected to the bridge will no longer be connected. As a first step in automating a reconnection of all tap devices when this happens, this patch modifies networkNotifyActualDevice() (which is called once for every <interface> of every active domain whenever libvirtd is restarted) to reconnect any tap devices that it finds disconnected. With this patch in place, you will need to restart libvirtd to reconnect all the taps to their proper bridges. A future patch will add a callback that hypervisor drivers can register with the network driver to that the network driver can trigger this behavior automatically whenever a network is started.
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>