Merge pull request #2229 from zhenyzha/mmu_basic

mmu_basic: New case to test disabling radix MMU mode on guest

qemu/tests/cfg/mmu_basic.cfg

+- mmu_basic:
+    type = mmu_basic
+    only pseries
+    only Host_RHEL.m8
+    no RHEL.6
+    virt_test_type = qemu
+    kill_vm = yes
+    kernel_extra_params_remove = disable_radix
+    image_snapshot = yes
+    mmu_option = yes
+    variants:
+        - @default:
+            only RHEL.8
+        - hpt:
+            machine_type_extra_params = "max-cpu-compat=power8"
+            RHEL.7:
+                mmu_option = no

qemu/tests/mmu_basic.py

+import logging
+import re
+
+from virttest import error_context
+from virttest import utils_test
+
+
+@error_context.context_aware
+def run(test, params, env):
+    """
+    Test to disabling radix MMU mode on guest.
+    Steps:
+    1) There are two options, boot up a native(radix)guest or HPT guest.
+    2) Check the MMU mode in the guest.
+    3) Adding disable radix to guest's kernel line directly then reboot guest.
+    4) Check again the MMU mode in the guest.
+    5) Check guest call trace in dmesg log.
+
+
+    :params test: QEMU test object.
+    :params params: Dictionary with the test parameters.
+    :params env: Dictionary with test environment.
+    """
+
+    def cpu_info_match(pattern):
+        match = re.search(pattern, session.cmd_output("cat /proc/cpuinfo"))
+        return True if match else False
+
+    vm = env.get_vm(params["main_vm"])
+    vm.verify_alive()
+    session = vm.wait_for_login()
+
+    error_context.context("Check the MMU mode.", logging.info)
+    if cpu_info_match('MMU'):
+        if cpu_info_match('POWER9'):
+            if cpu_info_match('Radix') is False:
+                test.fail("mmu mode is not Radix, doesn't meet expectations.")
+        else:
+            if cpu_info_match('Hash') is False:
+                test.fail("mmu mode is not Hash, doesn't meet expectations.")
+    else:
+        if params["mmu_option"] == 'yes':
+            test.fail("There should be MMU mode.")
+    utils_test.update_boot_option(vm, args_added="disable_radix")
+    session = vm.wait_for_login()
+
+    error_context.context("Check the MMU mode.", logging.info)
+    if cpu_info_match('MMU'):
+        if cpu_info_match('Hash') is False:
+            test.fail("mmu mode is not Hash, mmu mode disabled failure.")
+    else:
+        if params["mmu_option"] == 'yes':
+            test.fail("There should be MMU mode.")
+
+    vm.verify_dmesg()