> Also,I would like to add dynamic tap rules on vm start/stop,to reduce rules 
> when
> vm are offline migrated to another host.
> what do you think about it ?

Yes, we can update firewall rules whenever we start/stop a VM.

> Currently we don't have a qemu pve-bridge stop script. 

we don't really need an external script, instead we can directly setup the 
firewall
inside the API handler. We need that for hotplug anyways?

> Even with it, if the vm is
> crashing,the script is not launched.

This is only an optimization, so we can safely ignore that case?

> I don't known if it's possible to use magic udev rules to intercept tap 
> interface
> destroy and delete iptables rules dynamically ?

no, I don't like to use such things.
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