test: verify PVH boot protocol is used

Use test_api_happy_start to assert that the log message that indicates
usage of PVH boot protocol is present.

Only x86_64 guests support PVH boot, and on ARM we do not emit any log
messages, so restrict the assertion to x86_64 platforms.

Signed-off-by: Patrick Roy <[email protected]>

Author: roypat

tests/framework/utils.py

@@ -678,3 +678,8 @@ def __enter__(self):
 
     def __exit__(self, _type, _value, _traceback):
         signal.alarm(0)
+
+
+def pvh_supported() -> bool:
+    """Checks if PVH boot is supported"""
+    return platform.architecture() == "x86_64"

tests/integration_tests/functional/test_api.py

@@ -16,7 +16,7 @@
 
 import host_tools.drive as drive_tools
 import host_tools.network as net_tools
-from framework import utils_cpuid
+from framework import utils, utils_cpuid
 from framework.utils import get_firecracker_version_from_toml, is_io_uring_supported
 
 MEM_LIMIT = 1000000000
@@ -42,6 +42,9 @@ def test_api_happy_start(uvm_plain):
 
     test_microvm.start()
 
+    if utils.pvh_supported():
+        assert "Kernel loaded using PVH boot protocol" in test_microvm.log_data
+
 
 def test_drive_io_engine(uvm_plain):
     """