The HyperShift KubeVirt platform only supports guest clusters running 4.14 or greater (due to the kubevirt rhcos image only being delivered in 4.14)

and it also only supports OCP 4.14 and CNV 4.14 for the infra cluster. 

Add backend validation on the HostedCluster that validates the parameters are correct before processing the hosted cluster. If these conditions are not met, then report back the error as a condition on the hosted cluster CR