[AArch64] salt.control.virt support

Salt relies on a limiting libvirt_domain j2 template to generate the
XML it passes to libvirt for salt.control managed virtual machines.
For AArch64, we need to set up 3 XML nodes in a non-default way:
1. UEFI firmware (AAVMF) should be enabled by passing a pflash loader;
2. CPU mode should be 'host-passthrough';
3. QEMU machine type should be 'virt';

To allow configuring the above using pillar data:
- virtng module: implement functionality similar to upstream changes:
  * 219b84a512 virt module: Allow NVRAM unlinking on DOM undefine
    in develop, not in 2018.2;
  * 9cace9adb9 Add support to virt for libvirt loader
    in develop, not in 2018.2;
- virtng module: extend it with:
  * pass virt machine type to vm;
  * pass cpu_mode to vm;

JIRA: ARMBAND-404

Change-Id: Ib2123e7170991b3dfbdb42bd1a2baa5a4360b200
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

1 files changed, 157 insertions, 0 deletions

diff --git a/mcp/patches/salt-formula-salt/0001-libvirt-xml-pass-loader-virt-machine-cpu-mode.patch b/mcp/patches/salt-formula-salt/0001-libvirt-xml-pass-loader-virt-machine-cpu-mode.patch
new file mode 100644
index 000000000..effab8743
--- /dev/null
+++ b/mcp/patches/salt-formula-salt/0001-libvirt-xml-pass-loader-virt-machine-cpu-mode.patch
@@ -0,0 +1,157 @@
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+: Copyright (c) 2018 Mirantis Inc., Enea AB and others.
+:
+: All rights reserved. This program and the accompanying materials
+: are made available under the terms of the Apache License, Version 2.0
+: which accompanies this distribution, and is available at
+: http://www.apache.org/licenses/LICENSE-2.0
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+From: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
+Date: Sun, 24 Jun 2018 20:36:44 +0200
+Subject: [PATCH] libvirt xml: pass loader, virt machine, cpu mode
+
+- libvirt xml: pass loader param to vm
+  Based on upstream commit [1].
+- libvirt xml: pass virt machine type
+- libvirt xml: pass cpu mode to vm
+- virt module: Allow NVRAM unlinking on DOM undefine
+  UEFI-enabled VMs usually have pflash (NVRAM) devices attached,
+  which require one additional libvirt flag to be passed at 'undefine'.
+  This is usually the case for AArch64 (arm64) VMs, where AAVMF (AA64
+  UEFI) is the only supported guest bootloader.
+
+[1] https://github.com/saltstack/salt/commit/9cace9adb
+
+Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
+---
+ README.rst                           |  7 +++++
+ _modules/virtng.py                   | 40 +++++++++++++++++++++++++++-
+ salt/control/virt.sls                |  9 +++++++
+ tests/pillar/control_virt_custom.sls |  6 +++++
+ 4 files changed, 61 insertions(+), 1 deletion(-)
+
+diff --git a/README.rst b/README.rst
+index fd15b19..7f8f4a4 100644
+--- a/README.rst
++++ b/README.rst
+@@ -453,6 +453,13 @@ Control VM provisioning:
+                   rate:
+                     period: '1800'
+                     bytes: '1500'
++                # Custom per-node loader definition (e.g. for AArch64 UEFI)
++                loader:
++                  readonly: yes
++                  type: pflash
++                  path: /usr/share/AAVMF/AAVMF_CODE.fd
++                machine: virt-2.11  # Custom per-node virt machine type
++                cpu_mode: host-passthrough
+                 mac:
+                   nic01: AC:DE:48:AA:AA:AA
+                   nic02: AC:DE:48:AA:AA:BB
+diff --git a/_modules/virtng.py b/_modules/virtng.py
+index ce09508..6abd0eb 100644
+--- a/_modules/virtng.py
++++ b/_modules/virtng.py
+@@ -530,6 +530,9 @@ def init(name,
+          disk='default',
+          saltenv='base',
+          rng=None,
++         loader=None,
++         machine=None,
++         cpu_mode=None,
+          **kwargs):
+     '''
+     Initialize a new vm
+@@ -649,6 +652,37 @@ def init(name,
+
+     xml = _gen_xml(name, cpu, mem, diskp, nicp, hypervisor, **kwargs)
+
++    # TODO: Remove this code and refactor module, when salt-common would have updated libvirt_domain.jinja template
++    if cpu_mode:
++        xml_doc = minidom.parseString(xml)
++        cpu_xml = xml_doc.createElement("cpu")
++        cpu_xml.setAttribute('mode', cpu_mode)
++        xml_doc.getElementsByTagName("domain")[0].appendChild(cpu_xml)
++        xml = xml_doc.toxml()
++
++    # TODO: Remove this code and refactor module, when salt-common would have updated libvirt_domain.jinja template
++    if machine:
++        xml_doc = minidom.parseString(xml)
++        os_xml = xml_doc.getElementsByTagName("domain")[0].getElementsByTagName("os")[0]
++        os_xml.getElementsByTagName("type")[0].setAttribute('machine', machine)
++        xml = xml_doc.toxml()
++
++    # TODO: Remove this code and refactor module, when salt-common would have updated libvirt_domain.jinja template
++    if loader and 'path' not in loader:
++        log.info('`path` is a required property of `loader`, and cannot be found. Skipping loader configuration')
++        loader = None
++    elif loader:
++        xml_doc = minidom.parseString(xml)
++        loader_xml = xml_doc.createElement("loader")
++        for key, val in loader.items():
++            if key == 'path':
++                continue
++            loader_xml.setAttribute(key, val)
++        loader_path_xml = xml_doc.createTextNode(loader['path'])
++        loader_xml.appendChild(loader_path_xml)
++        xml_doc.getElementsByTagName("domain")[0].getElementsByTagName("os")[0].appendChild(loader_xml)
++        xml = xml_doc.toxml()
++
+     # TODO: Remove this code and refactor module, when salt-common would have updated libvirt_domain.jinja template
+     for _nic in nicp:
+         if _nic['virtualport']:
+@@ -1552,7 +1586,11 @@ def undefine(vm_):
+         salt '*' virtng.undefine <vm name>
+     '''
+     dom = _get_dom(vm_)
+-    return dom.undefine() == 0
++    if getattr(libvirt, 'VIR_DOMAIN_UNDEFINE_NVRAM', False):
++        # This one is only in 1.2.8+
++        return dom.undefineFlags(libvirt.VIR_DOMAIN_UNDEFINE_NVRAM) == 0
++    else:
++        return dom.undefine() == 0
+
+
+ def purge(vm_, dirs=False):
+diff --git a/salt/control/virt.sls b/salt/control/virt.sls
+index a2e56ff..1bcca95 100644
+--- a/salt/control/virt.sls
++++ b/salt/control/virt.sls
+@@ -58,6 +58,15 @@ salt_control_virt_{{ cluster_name }}_{{ node_name }}:
+   {%- elif rng is defined %}
+   - rng: {{ rng }}
+   {%- endif %}
++  {%- if  node.loader is defined %}
++  - loader: {{  node.loader }}
++  {%- endif %}
++  {%- if  node.machine is defined %}
++  - machine: {{ node.machine }}
++  {%- endif %}
++  {%- if  node.cpu_mode is defined %}
++  - cpu_mode: {{ node.cpu_mode }}
++  {%- endif %}
+   - kwargs:
+       seed: True
+       serial_type: pty
+diff --git a/tests/pillar/control_virt_custom.sls b/tests/pillar/control_virt_custom.sls
+index 71cf37f..dcfafbd 100644
+--- a/tests/pillar/control_virt_custom.sls
++++ b/tests/pillar/control_virt_custom.sls
+@@ -63,11 +63,17 @@ salt:
+             image: ubuntu.qcow
+             size: medium
+             img_dest: /var/lib/libvirt/ssdimages
++            machine: virt-2.11
++            cpu_mode: host-passthrough
+           ubuntu2:
+             provider: node02.domain.com
+             image: bubuntu.qcomw
+             size: small
+             img_dest: /var/lib/libvirt/hddimages
++            loader:
++              readonly: yes
++              type: pflash
++              path: /usr/share/AAVMF/AAVMF_CODE.fd
+           ubuntu3:
+             provider: node03.domain.com
+             image: meowbuntu.qcom2