KVM and Qemu Synchronization

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Hi All,
I am interested to know how the KVM Synchronize with Qemu. I know KVM maintain the time in PIT/RTC and Qemu it's own thread for IO devices callback (using alarm timers).  How it is guaranteed that Qemu maintained view of time is not passing to slow or too fast w.r.t KVM VCPu. 


Also, what's the approach for time synchronization when using SMP?


Thanks in advance.
-Abhishek 
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