qemu_coroutine_yield switches thread?

[Stefan Reiter]

Hi list,

quick question: Can a resume from a qemu_coroutine_yield happen in a 
different thread?

Well, it can, since I'm seeing it happen, but is that okay or a bug?

I.e. in a backup-job the following can sporadically trip:

  unsigned long tid = pthread_self();
  qemu_get_current_aio_context(); // returns main context
  qemu_coroutine_yield();
  qemu_get_current_aio_context(); // still returns main context, but:
  assert(tid == pthread_self()); // this fails

It seems to be called from a vCPU thread when it happens. VM uses no 
iothreads.

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