tests/acceptance: Automatic set -cpu to the test vm

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 resulting 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

Reviewed-by: Cleber Rosa <crosa@redhat.com>
Tested-by: Cleber Rosa <crosa@redhat.com>
Reviewed-by: Willian Rampazzo <willianr@redhat.com>
Signed-off-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
Message-Id: <20210430133414.39905-2-wainersm@redhat.com>
Signed-off-by: Cleber Rosa <crosa@redhat.com>

2 files changed, 22 insertions, 0 deletions

diff --git a/docs/devel/testing.rst b/docs/devel/testing.rst
index 19cbf532ae..8f572255d3 100644
--- a/docs/devel/testing.rst
+++ b/docs/devel/testing.rst
@@ -904,6 +904,17 @@ 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
+~~~
+
+The cpu model that will be set to all QEMUMachine instances created
+by the test.
+
+The ``cpu`` attribute will be set to the test parameter of the same
+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=cpu:VALUE`` tag, it will be set to ``VALUE``.
+
 machine
 ~~~~~~~
 
@@ -983,6 +994,12 @@ architecture of a kernel or disk image to boot a VM with.
 This parameter has a direct relation with the ``arch`` attribute.  If
 not given, it will default to None.
 
+cpu
+~~~
+
+The cpu model that will be set to all QEMUMachine instances created
+by the test.
+
 machine
 ~~~~~~~
 
diff --git a/tests/acceptance/avocado_qemu/__init__.py b/tests/acceptance/avocado_qemu/__init__.py
index 1de1edce0d..3a218057b3 100644
--- a/tests/acceptance/avocado_qemu/__init__.py
+++ b/tests/acceptance/avocado_qemu/__init__.py
@@ -213,6 +213,9 @@ class Test(avocado.Test):
         self.arch = self.params.get('arch',
                                     default=self._get_unique_tag_val('arch'))
 
+        self.cpu = self.params.get('cpu',
+                                   default=self._get_unique_tag_val('cpu'))
+
         self.machine = self.params.get('machine',
                                        default=self._get_unique_tag_val('machine'))
 
@@ -242,6 +245,8 @@ class Test(avocado.Test):
             name = str(uuid.uuid4())
         if self._vms.get(name) is None:
             self._vms[name] = self._new_vm(name, *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]