Missing kernel modules when using linux-kvm

Have been unable to use the linux-kvm package for our kvm virtual machines, because of missing kernel modules in the linux-modules-*-kvm package(s). The modules that has affected us for now are nfsd and tcp_bbr. Is there any reason they can't be included in the modules for linux-kvm? Or create a new linux-extra-modules-*-kvm package for those modules you deem undeserving to be in the linux-modules-*-kvm package.