[PATCH 1/3] tests/acceptance: Automatic set -cpu to the test vm

[Wainer dos Santos Moschetta <wainersm@redhat.com>]

This introduces a new feature to the functional tests: automatic setting of
the '-cpu VALUE' option to the created vm if the test is tagged with
'cpu:VALUE'. The 'cpu' property is made available to the test object as well.

For example, for a simple test as:

    def test(self):
        """
        :avocado: tags=cpu:host
        """
        self.assertEqual(self.cpu, "host")
        self.vm.launch()

The resulted QEMU evocation will be like:

    qemu-system-x86_64 -display none -vga none -chardev socket,id=mon,path=/var/tmp/avo_qemu_sock_pdgzbgd_/qemu-1135557-monitor.sock -mon chardev=mon,mode=control -cpu host

Signed-off-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
---
 docs/devel/testing.rst                    | 8 ++++++++
 tests/acceptance/avocado_qemu/__init__.py | 4 ++++
 2 files changed, 12 insertions(+)

diff --git a/docs/devel/testing.rst b/docs/devel/testing.rst
index 00ce16de48..40478672c0 100644
--- a/docs/devel/testing.rst
+++ b/docs/devel/testing.rst
@@ -844,6 +844,14 @@ name.  If one is not given explicitly, it will either be set to
 ``None``, or, if the test is tagged with one (and only one)
 ``:avocado: tags=arch:VALUE`` tag, it will be set to ``VALUE``.
 
+cpu
+~~~
+
+If the test is tagged with one (and only one) ``:avocado: tags=cpu:VALUE`` tag
+then the ``cpu`` attribute will be set to ``VALUE``, and the ``-cpu`` argument
+will be set to all QEMUMachine instances created by the test. Otherwise the
+attribute will be set to ``None``.
+
 machine
 ~~~~~~~
 
diff --git a/tests/acceptance/avocado_qemu/__init__.py b/tests/acceptance/avocado_qemu/__init__.py
index df167b142c..0f4649b173 100644
--- a/tests/acceptance/avocado_qemu/__init__.py
+++ b/tests/acceptance/avocado_qemu/__init__.py
@@ -193,6 +193,8 @@ def setUp(self):
         self.arch = self.params.get('arch',
                                     default=self._get_unique_tag_val('arch'))
 
+        self.cpu = self._get_unique_tag_val('cpu')
+
         self.machine = self.params.get('machine',
                                        default=self._get_unique_tag_val('machine'))
 
@@ -218,6 +220,8 @@ def get_vm(self, *args, name=None):
             name = str(uuid.uuid4())
         if self._vms.get(name) is None:
             self._vms[name] = self._new_vm(*args)
+            if self.cpu is not None:
+                self._vms[name].add_args('-cpu', self.cpu)
             if self.machine is not None:
                 self._vms[name].set_machine(self.machine)
         return self._vms[name]
-- 
2.29.2