thread-context: support new object thread-context

Includes support in avocado-vt for a new object:
thread-context. The intention of this new object
is to be used to make NUMA aware of the memory
preallocation threads.

Signed-off-by: mcasquer <[email protected]>

virttest/qemu_devices/qcontainer.py

@@ -2896,6 +2896,21 @@ def throttle_group_define_by_params(self, group_params, name):
         props = json.loads(group_params.get("throttle_group_parameters", "{}"))
         return QThrottleGroup(name, props)
 
+    def thread_context_define_by_params(self, params, name):
+        """
+        Create thread-context object from params.
+        """
+        tc_params = Params()
+        prefix = 'vm_thread_context_'
+        for key in list(params.keys()):
+            if key.startswith(prefix):
+                new_key = key.rsplit(prefix)[1]
+                tc_params[new_key] = params[key]
+        backend = "thread-context"
+        dev = qdevices.ThreadContext(backend, params=tc_params)
+        dev.set_param("id", "%s-%s" % ("thread_context", name))
+        return dev
+
     def memory_object_define_by_params(self, params, name):
         """
         Create memory object from params, default backend type is

virttest/qemu_devices/qdevices.py

@@ -1528,6 +1528,23 @@ def verify_unplug(self, out, monitor):
         return not self._query(monitor)
 
 
+class ThreadContext(QObject):
+    """
+    thread-context object.
+    """
+
+    def __init__(self, backend, params=None):
+        super(ThreadContext, self).__init__(backend, params)
+
+    def verify_hotplug(self, monitor):
+        """Verify if it is plugged into VM."""
+        return self._query(monitor)
+
+    def verify_unplug(self, monitor):
+        """Verify if it is unplugged from VM."""
+        return not self._query(monitor)
+
+
 class Memory(QObject):
 
     """

virttest/qemu_vm.py

@@ -1252,6 +1252,15 @@ def set_value(opt_string, key, fallback=None):
 
             return secret_cmdline + " -spice %s" % (",".join(spice_opts))
 
+        def add_thread_context(devices, params):
+            for thread_context in params.objects("vm_thread_contexts"):
+                thread_context_params = params.object_params(thread_context)
+                dev = devices.thread_context_define_by_params(thread_context_params, thread_context)
+                set_cmdline_format_by_cfg(dev, self._get_cmdline_format_cfg(),
+                                          "vm_thread_contexts")
+                devices.insert(dev)
+            return devices
+
         def add_qxl(qxl_nr, base_addr=29):
             """
             adds extra qxl devices
@@ -1766,6 +1775,9 @@ def add_secure_guest_descriptor(params):
         add_memorys(devices, params)
         mem = int(params.get("mem", 0))
 
+        # Add thread context object
+        add_thread_context(devices, params)
+
         # Get cpu model, before add smp, to determine cpu topology
         cpu_model = params.get("cpu_model", "")
         use_default_cpu_model = True