acpi/tests/avocado/bits: wait for 200 seconds for SHUTDOWN event from bits VM

By default, the timeout to receive any specified event from the QEMU VM is 60
seconds set by the python avocado test framework. Please see event_wait() and
events_wait() in python/qemu/machine/machine.py. If the matching event is not
triggered within that interval, an asyncio.TimeoutError is generated. Since the
timeout for the bits avocado test is 200 secs, we need to make event_wait()
timeout of the same value as well so that an early timeout is not triggered by
the avocado framework.

CC: peter.maydell@linaro.org
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2077
Signed-off-by: Ani Sinha <anisinha@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-id: 20240117042556.3360190-1-anisinha@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
(cherry picked from commit 7ef4c41e91d59d72a3b8bc022a6cb3e81787a50a)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

Author: ani-sinha

tests/avocado/acpi-bits.py

@@ -54,6 +54,8 @@
 deps = ["xorriso", "mformat"] # dependent tools needed in the test setup/box.
 supported_platforms = ['x86_64'] # supported test platforms.
 
+# default timeout of 120 secs is sometimes not enough for bits test.
+BITS_TIMEOUT = 200
 
 def which(tool):
     """ looks up the full path for @tool, returns None if not found
@@ -133,7 +135,7 @@ class AcpiBitsTest(QemuBaseTest): #pylint: disable=too-many-instance-attributes
 
     """
     # in slower systems the test can take as long as 3 minutes to complete.
-    timeout = 200
+    timeout = BITS_TIMEOUT
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
@@ -400,7 +402,8 @@ def test_acpi_smbios_bits(self):
 
         # biosbits has been configured to run all the specified test suites
         # in batch mode and then automatically initiate a vm shutdown.
-        # Rely on avocado's unit test timeout.
-        self._vm.event_wait('SHUTDOWN')
+        # Set timeout to BITS_TIMEOUT for SHUTDOWN event from bits VM at par
+        # with the avocado test timeout.
+        self._vm.event_wait('SHUTDOWN', timeout=BITS_TIMEOUT)
         self._vm.wait(timeout=None)
         self.parse_log()