The problem with pvpanic being an internal device is that VMs running
operating systems without a driver for this device will have problems
when qemu will be upgraded (from qemu without this pvpanic).
The outcome may be, for example: in Windows(let's say XP) the Device
manager will open a "new device" wizard and the device will appear as
an unrecognized device. On a cluster with hundreds of such VMs, If
that cluster has a health monitoring service it may show all the VMs
in a "not healthy" state.
Reported-by: Marcel Apfelbaum <address@hidden>
Signed-off-by: Hu Tao <address@hidden>