CPU host passthrough and scheduling VMs


some of my VMs need nested virtualization. I have added

<cpu mode='host-passthrough'>

to the KVM/raw data section of the VM template. This works until I migrate the VM (e.g. using onehost flush for host maintenance). VMs with this option crash or lock up when migrated to host with a different CPU model.

Is there any way how to tell the scheduler that the particular guest can be migrated only to hosts with the same CPU?
I don’t want to bind such a guest to a particular CPU type (i.e. to a particular set of hosts), I just want to keep it on hosts with the same CPU as the host where the guest was originally created.