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    SubjectRe: [PATCH v2 1/2] timekeeping: add EXPORT_SYMBOL_GPL for do_adjtimex()
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    I get that NTP can be installed locally.  This is how I regulate time
    on my guests. I agree the admin argument probably doesn't stand up.

    The problem is hyperv_clocksource (pluggable time source used by
    hyperv guests) is systematically fast in my environment. by around
    -250 PPM.
    I get away with NTP (just).
    However others have had to use tickadj to get hyperv_clocksource close
    enough for NTP to work i.e. inside +/-500 PPM. (This IS outside normal
    admin tasks)

    So if we are going to use NTP as the solution for hyperv guests (which
    is a valid one) the systematic drift of hyperv_clocksource in
    different environments will need to be addressed. Maybe this patch
    could be modified to tune the tick count on boot before NTP starts and
    then leave it alone so NTP can take over.


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