Comment 0 for bug 1882955

This is another case of linux-kvm having unexplained differences compared to linux-generic in areas that aren't related to hardware drivers (see other bug we filed for missing nft).

This time, CPC is reporting that LXD no longer works on linux-kvm as we now set vlan filtering on our bridges to prevent containers from escaping firewalling through custom vlan tags.

This relies on CONFIG_BRIDGE_VLAN_FILTERING which is a built-in on the generic kernel but is apparently missing on linux-kvm (I don't have any system running that kernel to confirm its config, but the behavior certainly matches that).

We need this fixed in focal and groovy.