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Yes, you can use KubeVirt for Windows. In some cases, it may be even better than Virtlet for that purpose. But if you want a real Kubernetes Deployment / StatefulSet / DaemonSet / etc. built out of VMs (examples being unikernels, nested Kubernetes cluster for testing etc.) Virtlet may be a better choice.

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True - Today it does not directly fit into existing workload controllers (Deployment, ReplicaSet etc) but SIG Api Machinery actually saw that others would also like to see CRD support in templates of controllers.

If this lands, then KubeVirt would get that support "for free" (tm)

Regarding the nested cluster: One of the main reasons for having the VirtualMachineReplicaSet in KubeVirt is to allow that use-case. They work pretty nice in combination with CloudInit and e.g. kubeadm to dynamically scale the cluster.

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