So I took a closer look at this, and I did a diff of an "ip a" between iommu on and iommu off, and the only changes are the MACs of the tap/fwbr interfaces, which change every boot anyway.
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000...
When I add intel_iommu=on to my boot options in GRUB, all my networking (both for the host and the guests) stops working. I have to walk over to the machine, log in, and change it back.
At first glance, everything looks fine with the network (correct interfaces are showing as UP, bridges are...
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