commit a0e136d436ded817c0aade72efdefa56a00b4e5e
author Marcelo Tosatti <mtosatti@redhat.com> Tue Jan 24 15:09:42 2017 -0200
committer Paolo Bonzini <pbonzini@redhat.com> Wed Feb 08 17:16:20 2017 +0100
tree 8dabe40530f4b7e5742cece09fff99c6b6c2ed82
parent f4066c2bc4d0de4e5dcbff21dae41e89fe8f38c0

PTP: add kvm PTP driver

Add a driver with gettime method returning hosts realtime clock.
This allows Chrony to synchronize host and guest clocks with
high precision (see results below).

chronyc> sources
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================

To configure Chronyd to use PHC refclock, add the
following line to its configuration file:

refclock PHC /dev/ptpX poll 3 dpoll -2 offset 0

Where /dev/ptpX is the kvmclock PTP clock.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>