[JoshTriplett]

For anyone looking at the mentions of KVM "under some circumstances" having the same issue and wondering how to avoid it with KVM: KVM appears to support fast vDSO-based time calls as long as:

- You have a stable hardware TSC (you can check this in /proc/cpuinfo on the host, but all reasonably recent hardware should support this).

- The host has the host-side bits of the KVM pvclock enabled.

As long as you meet those two conditions, KVM should support fast vDSO-based time calls.