To utilize the windowsli ROSA feature, on uploading a new golden image into the cluster, the default preferences should be set to the windows version related preference, e.g. "windows.11.virtio.dedicated" for windows 11. These default preferences should be shipped with CNV as other default preferences for Windows VMs are already

https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html/virtualization/creating-a-virtual-machine#virt-creating-vm-instancetype_virt-creating-vms-from-instance-types

https://github.com/openshift/openshift-docs/blame/76489fe028c7965bed446a187c62a6e53ac4550e/modules/virt-creating-vm-instancetype.adoc#L64

For all supported Windows versions (Microsoft Windows 11, Microsoft Windows Server 2016, 2019, 2022 and 2025), a new preferences has to be added. The dedicated CPU has to be added to the new preferences, e.g. using kustomize, in midstream.
The Windows 11 preference should look like windows.11.virtio.dedicated in https://github.com/openshift/managed-cluster-config/pull/2588/files .
No non-virtio preferences are required.

Let's start in 4.21, and if it works apply also to 4.20 and 4.19.