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<section id="failover">
<h1>FAILOVER<a class="headerlink" href="#failover" title="Link to this heading">¶</a></h1>
<section id="overview">
<h2>Overview<a class="headerlink" href="#overview" title="Link to this heading">¶</a></h2>
<p>The failover module provides a generic interface for paravirtual drivers
to register a netdev and a set of ops with a failover instance. The ops
are used as event handlers that get called to handle netdev register/
unregister/link change/name change events on slave pci ethernet devices
with the same mac address as the failover netdev.</p>
<p>This enables paravirtual drivers to use a VF as an accelerated low latency
datapath. It also allows live migration of VMs with direct attached VFs by
failing over to the paravirtual datapath when the VF is unplugged.</p>
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