openqa/worker: add boot script to fix KVM perms and disable SMT

For some reason /dev/kvm has 0600 perms after boot on the ppc64
worker host. Also, qemu won't run unless SMT is turned off, on
ppc64. I've just been doing this manually every time the box got
restarted, but that's dumb, so let's make it happen on boot with
a script and a service to run it.

Signed-off-by: Adam Williamson <awilliam@redhat.com>

roles/openqa/worker/files/openqa-ppc64-prep.service

@@ -0,0 +1,12 @@
+[Unit]
+Description=openQA ppc64 worker prep script
+
+[Service]
+Type=oneshot
+ExecStart=/usr/local/sbin/openqa-ppc64-prep.sh
+ExecReload=/bin/true
+ExecStop=/bin/true
+RemainAfterExit=yes
+
+[Install]
+WantedBy=multi-user.target

roles/openqa/worker/files/openqa-ppc64-prep.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+# On boot, /dev/kvm perms are 0600 for some reason
+chmod ugo+rw /dev/kvm
+
+# SMT must be off for qemu to work properly
+ppc64_cpu --smt=off

roles/openqa/worker/tasks/main.yml

@@ -33,6 +33,23 @@
   - packages
   when: "ansible_architecture is defined and ansible_architecture == 'x86_64'"
 
+- name: Install boot script (to set /dev/kvm perms and disable SMT) (ppc64 only)
+  copy: src=openqa-ppc64-prep.sh dest=/usr/local/sbin/openqa-ppc64-prep.sh owner=root group=root mode=0755
+  when: "ansible_architecture is defined and ansible_architecture == 'ppc64le'"
+
+- name: Install systemd service to run boot script (ppc64 only)
+  copy: src=openqa-ppc64-prep.service dest=/etc/systemd/system/openqa-ppc64-prep.service
+  when: "ansible_architecture is defined and ansible_architecture == 'ppc64le'"
+  register: prepservice
+
+- name: Do systemctl daemon-reload to register new service (ppc64 only)
+  command: "systemctl daemon-reload"
+  when: "prepservice is defined and prepservice|changed"
+
+- name: Enable systemd service to run boot script (ppc64 only)
+  service: name=openqa-ppc64-prep enabled=yes state=started
+  when: "ansible_architecture is defined and ansible_architecture == 'ppc64le'"
+
 - include: nfs-client.yml
   when: openqa_hostname is defined and openqa_hostname != "localhost"