Add KVM Virtual PTP Driver topic to OpenStack VNF section

Change-Id: I20f80b3614128a2462e87461b9cb9898683fc8fc
Signed-off-by: Keane Lim <keane.lim@windriver.com>

doc/source/guest_integration/openstack/configure-kvm-virtual-ptp-driver.rst

@@ -0,0 +1,46 @@
+
+.. hdw1619620921761
+.. _configure-kvm-virtual-ptp-driver:
+
+================================
+Configure KVM Virtual PTP Driver
+================================
+
+The |KVM| virtual |PTP| driver allows guests to sync the |VM| reference clock
+to the host's high precision PTP clock reference.
+
+.. rubric:: |prereq|
+
+|PTP| must be enabled on |prod| in order to use the |KVM| virtual |PTP|
+driver in guest |VMs|.
+
+To leverage |PTP| in a |VM| and sync the |VM| reference clock with the
+hosting compute or |AIO|-controller node, do the following in the |VM|:
+
+.. rubric:: |proc|
+
+#.  Load the |KVM| |PTP| driver:
+
+    .. code-block:: none
+
+        ~(keystone_admin)$ modprobe kvm_ptp
+
+#.  Update the reference clock in the chrony config file \(/etc/chrony.conf\):
+
+    .. code-block:: none
+
+        ~(keystone_admin)$ refclock PHC /dev/ptp0 poll 3 dpoll -2 offset 0
+
+#.  Restart the chronyd service:
+
+    .. code-block:: none
+
+        ~(keystone_admin)$ systemctl restart chronyd.service
+
+#.  Confirm that the |PTP| device is in the list of time sources:
+
+    .. code-block:: none
+
+        ~(keystone_admin)$ systemctl restart chronyd.service
+
+

doc/source/guest_integration/openstack/index.rst

@@ -21,15 +21,21 @@ Bootstrap Data
    bootstrap-data
    configuration-using-metadata
 
-************************************
-About Accelerated Virtual Interfaces
-************************************
+**************************
+Virtual Network Interfaces
+**************************
 
 .. toctree::
-   :maxdepth: 2
+   :maxdepth: 1
 
    standard-virtio-backed-with-vhost-support
    use-a-vif-model-when-creating-ports
+   
+********************
+Use Host's PTP Clock
+********************
 
-
-
+.. toctree::
+   :maxdepth: 1
+   
+   configure-kvm-virtual-ptp-driver

doc/source/shared/abbrevs.txt

@@ -48,6 +48,7 @@
 .. |IoT| replace:: :abbr:`IoT (Internet of Things)`
 .. |IPMI| replace:: :abbr:`IPMI (Intelligent Platform Management Interface)`
 .. |IOPS| replace:: :abbr:`IOPS (I/O operations per second)`
+.. |KVM| replace:: :abbr:`KVM (Kernel-based Virtual Machine)`
 .. |LACP| replace:: :abbr:`LACP (Link Aggregation Control Protocol)`
 .. |LAG| replace:: :abbr:`LAG (Link Aggregation)`
 .. |LDAP| replace:: :abbr:`LDAP (Lightweight Directory Access Protocol)`