Messages in this thread | | | Date | Mon, 20 Oct 2014 23:02:13 -0500 | From | Jeff Epler <> | Subject | Re: [PATCH v2 1/2] timekeeping: add EXPORT_SYMBOL_GPL for do_adjtimex() |
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On Tue, Oct 21, 2014 at 03:18:58AM +0000, Thomas Shao wrote: > In some situation, the user is not able to enable guest VM to sync with external > time source, like NTP. But the host is still synced with a trusted time source. > In this case, host-guest time synchronization is useful.
It's interesting to imagine that a virtualization host could present a time service to the guest *userspace*, even when the guest is not otherwise exposed to the internet at large. This could take the form of an NTP server on a private network, or as an implementation of a time source directly usable by ntpd in the guest, for instance as an emulated serial port with synthetic NEMA GPS signal + PPS signal, for instance.
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