Xen should use "console=hvc0" on boot

[Alvaro Lopez]

Xen's console is attached to hvc0 in PV guests [1]. If an image does set it up on its grub configuration, the instance may not boot properly.

Nova could set the os_cmdline for that guest as it is doing for other hypervisors (for example for LXC), adding the console setup there, so that libvirt configures the domain properly.

[1] https://wiki.xen.org/wiki/Xen_FAQ_Console

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/469826

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/469826
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=8ceba86a9d816336a42f7636cce85dc2f8e76dbc
Submitter: Jenkins
Branch: master

commit 8ceba86a9d816336a42f7636cce85dc2f8e76dbc
Author: Alvaro Lopez Garcia <email address hidden>
Date: Thu Jun 1 11:39:33 2017 +0200

    xen: pass Xen console in cmdline

    Xen's console is attached to hvc0 in PV guests [1]. If an image does set
    it up on its grub configuration, the instance may not boot properly.

    Nova is setting the os_cmdline for other hypervisors, so it should do
    the same for Xen. This way libvirt will configures the domain properly.

    [1] https://wiki.xen.org/wiki/Xen_FAQ_Console

    Change-Id: I7600c6e966ab3829185d008077463e9689b9afd5
    Closes-Bug: 1691190

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/nova 16.0.0.0b3 development milestone.