> -----Original Message-----
> From: Chris Caudle <6807.ch...@pop.powweb.com>
> Sent: Sunday, May 23, 2021 2:08 PM
> To: linuxptp-users@lists.sourceforge.net
> Subject: Re: [Linuxptp-users] Enable support for hardware timestamping
>
> > From: Sebastian Parakal <sebastianpara...@gmail.com>
> > I use an Ubuntu 20.04 Server version VM. And while checking the system
> > requirements ,I noticed that the hardware timestamping isn't present.
>
> I think in a VM the only way to get hardware timestamping would be to give
> the VM dedicated access to that hardware interface so that the VM software
> can access the registers directly. Otherwise the VM OS is accessing a
> virtual network controller that gets routed through software bridging out
> through the base OS network stack, and can't access the PHC.
>
> --
> Chris Caudle
Correct. The virtual device has to have access to and support controlling the
PHC. The standard software-bridge based mechanisms won't work.
It is plausible that a SRIOV based device might support such a feature, but
otherwise I would not expect such support.
Thanks,
Jake
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