add case for guest without memballoon

  VIRT-299022: Check No error msg prompts without guest memory balloon driver
Signed-off-by: nanli <[email protected]>

libvirt/tests/cfg/memory/memory_balloon/guest_without_mem_balloon.cfg

@@ -0,0 +1,23 @@
+- memory.balloon.no_balloon:
+    type = guest_without_mem_balloon
+    start_vm = no
+    set_mem = 1843200
+    mem_unit = "KiB"
+    current_mem_unit = "KiB"
+    current_mem = "2097152"
+    mem_value = "2097152"
+    module = "virtio_balloon"
+    rm_module = "modprobe -r %s"
+    check_module = "lsmod |grep %s"
+    variants:
+        - virtio_model:
+            memballoon_model = "virtio"
+        - virtio_trans_model:
+            memballoon_model = "virtio-transitional"
+        - virtio_non_trans_model:
+            memballoon_model = "virtio-non-transitional"
+    device_dict = "{'model':'${memballoon_model}'}"
+    variants:
+        - memory_allocation:
+            mem_attrs = {'memory_unit':'${mem_unit}','memory':${mem_value},'current_mem':${current_mem},'current_mem_unit':'${current_mem_unit}'}
+            expect_xpath = [{'element_attrs':[".//memory[@unit='${mem_unit}']"],'text':'${mem_value}'},{'element_attrs':[".//currentMemory[@unit='${current_mem_unit}']"],'text':'${current_mem}'}]

libvirt/tests/src/memory/memory_balloon/guest_without_mem_balloon.py

@@ -0,0 +1,99 @@
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+#
+#   Copyright Redhat
+#
+#   SPDX-License-Identifier: GPL-2.0
+
+#   Author: Nannan Li<[email protected]>
+#
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+from virttest import virsh
+
+from virttest.libvirt_xml import vm_xml
+from virttest.libvirt_xml.devices import memballoon
+from virttest.utils_libvirt import libvirt_vmxml
+from virttest.utils_test import libvirt
+
+
+def run(test, params, env):
+    """
+    Verify no error msg prompts without guest memory balloon driver.
+    Scenario:
+    1.memory balloon models: virtio, virtio-transitional, virtio-non-transitional.
+    """
+
+    def remove_module(module_name):
+        """
+        Remove specific module.
+
+        :params module_name: name of one module.
+        """
+        session = vm.wait_for_login()
+        status, stdout = session.cmd_status_output(rm_module % module_name)
+        if status != 0:
+            test.log.failed("Fail to remove virtio_balloon module:\n%s" % stdout)
+
+        status, stdout = session.cmd_status_output(check_module % module_name)
+        if stdout:
+            test.fail("virtio_balloon module should be removed: '%s'" % stdout)
+        session.close()
+
+    def run_test():
+        """
+        Define and start guest
+        Check No error msg prompts without guest memory balloon driver.
+        """
+        test.log.info("TEST_STEP1: Define guest")
+        vmxml = vm_xml.VMXML.new_from_inactive_dumpxml(vm_name)
+
+        vmxml.del_device('memballoon', by_tag=True)
+        mem_balloon = memballoon.Memballoon()
+        mem_balloon.setup_attrs(**device_dict)
+        vmxml.devices = vmxml.devices.append(mem_balloon)
+
+        vmxml.setup_attrs(**mem_attrs)
+        vmxml.sync()
+
+        test.log.info("TEST_STEP2: Start guest ")
+        if not vm.is_alive():
+            vm.start()
+        vmxml = vm_xml.VMXML.new_from_dumpxml(vm_name)
+        test.log.debug("After define vm, get vmxml is:\n%s", vmxml)
+
+        test.log.info("TEST_STEP3: Remove virtio_balloon module in guest")
+        remove_module(module)
+
+        test.log.info("TEST_STEP4: Change guest current memory allocation")
+        result = virsh.setmem(domain=vm_name, size=set_mem, debug=True)
+        libvirt.check_exit_status(result)
+
+        test.log.info("TEST_STEP5: Check memory allocation is not changed")
+        vmxml = vm_xml.VMXML.new_from_dumpxml(vm_name)
+        libvirt_vmxml.check_guest_xml_by_xpaths(vmxml, expect_xpath)
+
+    def teardown_test():
+        """
+        Clean data.
+        """
+        test.log.info("TEST_TEARDOWN: Clean up env.")
+        bkxml.sync()
+
+    vm_name = params.get("main_vm")
+    vm = env.get_vm(vm_name)
+    vmxml = vm_xml.VMXML.new_from_inactive_dumpxml(vm_name)
+    bkxml = vmxml.copy()
+
+    mem_attrs = eval(params.get("mem_attrs", "{}"))
+    device_dict = eval(params.get("device_dict", "{}"))
+    set_mem = int(params.get("set_mem"))
+    module = params.get("module")
+    check_module = params.get("check_module")
+    rm_module = params.get("rm_module")
+    expect_xpath = eval(params.get("expect_xpath", '{}'))
+
+    try:
+        run_test()
+
+    finally:
+        teardown_test()