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A comment on Clock Skew Exists. Parent comment

Re:Clock Skew Exists by jschwartzi on Wednesday February 10, 2016 @10:26PM (#11078063)
Monotonic clocks are guaranteed never to go backwards, for one. In POSIX it would be a major violation of the API, although implementations are free to substitute clock sources if the monotonic source is not provided.
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Re:Clock Skew Exists by derefr on Thursday February 11, 2016 @01:15AM (#11078518)
Or, to put it more bluntly: a hypervisor that allows its VMs to be paused SHOULD NOT expose a monotonic time source to said VMs. (In the RFC meaning of "SHOULD NOT".) Enabling monotonic time should disable the ability to pause/migrate/snapshot the VMs, and vice-versa.
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