Is there an immutable KVM host OS?

My homelab environment is primarily git repo->puppet apply->centos7 hardware running kvm or guests. Simple tooling but it works. I'm doing a lot more terraform at work these days and have been thinking about refreshing my homelab with an ansible/terraform pattern but I've been looking at my OS base for the KVM hosts and wondering if there is a better way. So, the question...... Is anyone aware of a unix OS pattern that's PXE booting, immutable, container friendly and usable as a basic KVM host? Something like CoreOS/Flatcar but for KVM guests instead of just containers. Ideally with config data from cloud-init and something like vault. Thanks!