openqa/worker: more packages for createhdds, set SMT setting

One of the IBM guys helpfully pointed out we need to set this
SMT thing to 'off' for VMs to run properly. I've no idea why,
but this is how we do it!

roles/openqa/worker/tasks/createhdds.yml

@@ -4,16 +4,36 @@
 - name: Install required packages
   dnf: name={{ item }} state=present
   with_items:
+  - libvirt-daemon-kvm
   - libvirt-python3
   - python3-libguestfs
   - python3-fedfind
+  - qemu-kvm
   - virt-install
   tags:
   - packages
 
+- name: Install PowerPC-specific packages
+  dnf: name=powerpc-utils state=present
+  when: ansible_architecture == 'ppc64' or ansible_architecture == 'ppc64le'
+  tags:
+  - packages
+
 - name: Allow libvirt to read/write to NFS
   seboolean: name=virt_use_nfs state=yes persistent=yes
 
+- name: Check if SMT setting needs changing
+  command: "ppc64_cpu --smt"
+  register: smtcheck
+  failed_when: "1 != 1"
+  changed_when: "1 != 1"
+  check_mode: no
+  when: ansible_architecture == 'ppc64' or ansible_architecture == 'ppc64le'
+
+- name: Change SMT setting if necessary
+  command: "ppc64_cpu --smt=off"
+  when: "smtcheck is defined and smtcheck.stdout.find('is off') == -1"
+
 - name: Check out createhdds
   git:
     repo: https://pagure.io/fedora-qa/createhdds.git