No, it's just that it's the kind of feature that's quite hard to retrofit to an existing design, since it breaks existing assumptions in a lot of places. And it

No, it's just that it's the kind of feature that's quite hard to retrofit to an existing design, since it breaks existing assumptions in a lot of places. And it's only relatively recently that the kind of embedded board that you usually want to emulate with QEMU has had a multi-core CPU.