Is PCI passthrough definitely needed for Ntopng Edge on KVM?

Hi,

Does Ntopng edge always need PCI passthrough on network cards?

I'm thinking of setting up a Proxmox 5.2 system, running ntopng Edge in a
KVM virtual-machine.

The physical machine has four on-board Ethernet ports, so I was going to
pass through two of these to act inline.

However, I see that
https://www.ntop.org/guides/nedge/get_started.html#running-into-a-vm mentions
that you must enable PCI passthrough.

Is this for performance reasons? Or there's some other reasons for it?

Thanks,
Victor

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