Can't create kvm machines on a vmware server

I have MAAS installed on a VMware machine. I wish to use MAAS to create some KVM based virtual machines.
It seems that when I compose a new KVM that maas passes the parameter -cpu=qemu64 to the virsh command which then complains with:
warning: host doesn’t support requested feature: CPUID.80000001H:ECX.svm [bit 2]
My reading of the issue is that this can be solved by changing the -cpu=host.

Note I have the vmware machine already correctly configured and can manually create and start kvm’s outside of maas.