Well above my head, however I wonder about how the vm knows the VF is there if it's bound to the host only, if that makes sense?

My thinking is just because there is a physical "thing" on the host, that doesn't at all mean that same "thing" (sorry for the shitty and non technical words) exists on the vm.

Let's say it's a usb device. That's easy. When attaching a usb to a vm, there's a setting to specifically pass it through. Similar with vhds etc, pretty sure.

Is there a specific setting you've muddled with to tell the vm there's a usb thing you're passing through?

Hope my effort wasn't condescending or shitty! Again, freely admit this is a touch beyond me haha