docs/system/virtio-net-failover.rst

14 The two devices are called primary and standby device. The fast hardware based
15 networking device is called the primary device and the virtio-net device is the
21 Currently only PCIe devices are allowed as primary devices, this restriction
23 devices are allowed as primary device. The user needs to ensure that primary
33   another host QEMU will unplug the primary device via the PCIe based hotplug
35   system the primary device will be automatically plugged back and the
36   net_failover module registers it again as the primary device.
41   The primary device can be hotplugged or be part of the startup configuration
57   Both primary and standby device can be hotplugged via the QEMU monitor.  Note
59   couldn't find the primary device.
64   A new migration state wait-unplug was added for this feature. If failover primary
67   active state. On the target system the primary devices will be automatically hotplugged