[libvirt] [PATCH 00/13] Fix device hotplug with QEMU and -device

[Daniel P. Berrange]

The current libvirt code enables use of -device when launching QEMU
but forgot to update the equivalent code for hotpluging devices to
an already running QEMU. This series implements the latter, doing
three core things

 - Assign a unique PCI slot to the new device
 - Assign a unique device alias to the new device
 - Call the device_add function for attaching the device

As a minor flaw in the whole plan, it turns out the new -netdev
code in QEMU 0.12 does not support hotplugging at all. So this
series  also switching network setup back to using the old VLAN
based syntax. Hopefully we can re-introduce use of -netdev with
QEMU 0.13, since it gives important performance benefits.