Current differences between qemu --enable-kvm and qemu-kvm?

Hi all,

is there a summary existing that shows up the rough or actual differences between qemu --enable-kvm and qemu-kvm? I tested both versions with the same compile and start options, the CPU performance results are identical, only the bootup time of my guest system with qemu-kvm seemed to be a bit faster (not measured, it just feeled so).

Thanks.

Best regards,

Erik