Comment 8 for bug 1909063

Reviewed: https://review.opendev.org/c/openstack/kolla-ansible/+/895373
Committed: https://opendev.org/openstack/kolla-ansible/commit/401a39f5245cf616dcff8eb67de1bbc3b46fc9c8
Submitter: "Zuul (22348)"
Branch: stable/yoga

commit 401a39f5245cf616dcff8eb67de1bbc3b46fc9c8
Author: Jeffrey Zhang <email address hidden>
Date: Wed Dec 23 13:42:16 2020 +0800

    Configure Nova libvirt.num_pcie_ports to 16 by default

    When using the 'q35' machine type, by default, it allows only
    a single PCIe device to be hotplugged. Nova currently sets
    'num_pcie_ports' to "0" (defaults to libvirt's "1"), which is
    not sufficient for hotplug use.

    The max value is 28, but 16 is enough in most cases.

    More info please check

    * [0] https://libvirt.org/pci-hotplug.html
    * [1] https://marcin.juszkiewicz.com.pl/2018/02/19/hotplug-in-vm-easy-to-say/
    * [2] https://review.opendev.org/c/openstack/nova/+/545034

    Co-Authored-By: Bartosz Bezak <email address hidden>

    Change-Id: I7b8063566837aeb947927b7d6858417982b63deb
    Closes-Bug: 1909063
    (cherry picked from commit b8e77deeeff011b5ca9ef891d4335ff72d7986f6)