On Tue, Oct 01, 2019 at 05:48:41AM +0200, Hans-Heinrich Hansen wrote:
> are there any ideas how LinuxPTP could be used in virtual machines?
>
> It would be sufficient to be able to use the exact time generated by PTP,
> e.g. with LinuxPTP running on the host system.
On the VM host, simply run ptp4l, ntpd, or chrony etc, as normal.
On the VM guest, enable PTP_1588_CLOCK_KVM (since 4.11), or use
Microsoft Hyper-V guest support (also 4.11+) in a Windows host.
A PHC device representing the host clock will appear in the guest.
Then, for example:
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.
(I have never used this myself, but it is supposed to work!)
HTH,
Richard
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