kvm masterclock

[Mika Penttilä <mika.penttila@xxxxxxxxxxxx>]

While using the master clock among guests, when is it updated? Thought it had to be in 

pvclock_gtod_notify() but it only triggers update of :

  master_kernel_ns, master_cycle_now

if clocksource changes away from TSC :

      if (gtod->clock.vclock_mode != VCLOCK_TSC &&
            atomic_read(&kvm_guest_has_master_clock) != 0)
                queue_work(system_long_wq, &pvclock_gtod_work);

And gtod work would set KVM_REQ_MASTERCLOCK_UPDATE if queued, which is not the case if always TSC.

So kvm_guest_time_update() always uses same values is use_master_clock ?

Maybe I missed some piece?

--Mika

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