SMP est definitely possible in QEMU - a few days of work are necessary to add the missing generic support and an x86 implementation... but currently I prefer to work an other topics.
Just for your information, some choices need to be made:
1) Do the CPUs share the same translation cache ?
This could be very useful, but wouldn't the cache need to be indexed by physical addresses, not virtual?
2) The first implementation would use a cycle counter to schedule between CPUs. Is it interesting to go further and to use a host thread for each guest CPU at the expense of more locking overhead ?
I'd skip the cycle counter at first iteration and schedule using a host timer and CPU idling. What are the things that need locking, by the way?
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