test: Check all vCPUs have the same features inside guest

The test ensures Firecracker or CPU templates don't configure CPU features differently between vCPUs. Note that whether the printed CPU features are expected or not should be tested in (arch-specific) test_cpu_features_*.py only for vCPU 0. Thus, we only test the equivalence of all CPUs in the same guest. Signed-off-by: Takahiro Itazuri <[email protected]>
firecracker-microvm · Dec 4, 2024 · a9d07d6 · a9d07d6
1 parent fa07e9f
commit a9d07d6
Showing 1 changed file with 19 additions and 0 deletions.
diff --git a/tests/integration_tests/functional/test_cpu_multiple.py b/tests/integration_tests/functional/test_cpu_multiple.py
@@ -17,3 +17,22 @@ def test_all_vcpus_online(uvm_any):
     vm = uvm_any
     for idx in range(vm.vcpus_count):
         assert vm.ssh.check_output(f"cat /sys/devices/system/cpu/cpu{idx}/online").stdout == "1\n"
+
+
+def test_all_vcpus_have_same_features(uvm_any):
+    """
+    Check all vCPUs have the same features inside guest.
+
+    This test ensures Firecracker or CPU templates don't configure CPU features
+    differently between vCPUs.
+
+    Note that whether the shown CPU features are expected or not should be
+    tested in (arch-specific) test_cpu_features_*.py only for vCPU 0. Thus, we
+    only test the equivalence of all CPUs in the same guest.
+    """
+    vm = uvm_any
+
+    # Get features of all CPUs
+    features = vm.ssh.check_output("cat /proc/cpuinfo | grep Features").stdout.splitlines()
+    for idx in range(1, vm.vcpus_count):
+        assert features[0] == features[idx]