On 05/24/2011 02:20 PM, Tian, Kevin wrote:
> I don't think it's possible. Both calls are done with interrupts disabled. If that's the case then there's another potential issue. Deadlock may happen when calling smp_call_function_single with interrupt disabled.
We don't do that. vcpu migration calls vcpu_clear() with interrupts enabled, which then calls smp_call_function_single(), which calls __vcpu_clear() with interrupts disabled. vmclear_local_vcpus() is called from interrupts disabled (and calls __vcpu_clear() directly).
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