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For some reason I thought the reason that this hadn't been implemented already was that Sony had patents on multithreaded binary translation. I guess those might have only applied to specific techniques for heterogeneous or ring-bus systems (i.e. Cell), though.
pm215
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.

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