From: Vivek Thampi <redacted>
Date: Fri, 28 Feb 2020 05:32:46 +0000

Add a PTP clock driver called ptp_vmw, for guests running on VMware ESXi
hypervisor. The driver attaches to a VMware virtual device called
"precision clock" that provides a mechanism for querying host system time.
Similar to existing virtual PTP clock drivers (e.g. ptp_kvm), ptp_vmw
utilizes the kernel's PTP hardware clock API to implement a clock device
that can be used as a reference in Chrony for synchronizing guest time with
host.

The driver is only applicable to x86 guests running in VMware virtual
machines with precision clock virtual device present. It uses a VMware
specific hypercall mechanism to read time from the device.

Reviewed-by: Thomas Hellstrom <redacted>
Signed-off-by: Vivek Thampi <redacted>
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 Based on feedback, resending patch to include a broader audience.

If it's just providing a read of an accurate timesource, I think it's kinda
pointless to provide a full PTP driver for it.