add case for mem balloon autodeflate

   VIRT-299026: Memory balloon autodeflate config
Signed-off-by: nanli <[email protected]>

libvirt/tests/cfg/memory/memory_balloon/mem_balloon_autodeflate.cfg

@@ -0,0 +1,30 @@
+- memory.balloon.autodeflate:
+    type = mem_balloon_autodeflate
+    start_vm = no
+    set_mem = 1945600
+    mem_unit = "KiB"
+    current_mem_unit = "KiB"
+    current_mem = "2097152"
+    mem_value = "2097152"
+    dominfo_check = "Max memory:(\s+)${mem_value} KiB\nUsed memory:(\s+)${set_mem} KiB"
+    variants:
+        - virtio_model:
+            memballoon_model = "virtio"
+        - virtio_trans_model:
+            memballoon_model = "virtio-transitional"
+        - virtio_non_trans_model:
+            memballoon_model = "virtio-non-transitional"
+    variants:
+        - autodeflate_undefined:
+            autodeflate = ''
+            auto_attr = ""
+        - autodeflate_off:
+            autodeflate = "off"
+            auto_attr = ",'autodeflate':'${autodeflate}'"
+        - autodeflate_on:
+            autodeflate = "on"
+            auto_attr = ",'autodeflate':'${autodeflate}'"
+    device_dict = "{'model':'${memballoon_model}' ${auto_attr}}"
+    variants:
+        - memory_allocation:
+            mem_attrs = {'memory_unit':'${mem_unit}','memory':${mem_value},'current_mem':${current_mem},'current_mem_unit':'${current_mem_unit}'}

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

@@ -0,0 +1,111 @@
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+#
+#   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.utils_test import libvirt
+from virttest.libvirt_xml.devices import memballoon
+from virttest.staging import utils_memory
+
+
+def run(test, params, env):
+    """
+    Verify the autodeflate takes effect with various memory balloon models.
+
+    Scenario:
+    1.memory balloon models: virtio, virtio-transitional, virtio-non-transitional.
+    2.autodeflate: on, off, default.
+    3.mem config: mem, current mem.
+    """
+    def get_memtotal():
+        """
+        Get memTotal value
+
+        :return: mem_total, the value of 'cat /proc/meminfo | grep MemTotal'
+        """
+        session = vm.wait_for_login()
+        mem_total = utils_memory.memtotal(session)
+        session.close()
+
+        return mem_total
+
+    def run_test():
+        """
+        Define and start guest
+        Check memTotal and memory allocation
+        """
+        test.log.info("TEST_STEP1: Define guest")
+        vmxml = vm_xml.VMXML.new_from_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: Login guest and get the total guest memory")
+        init_mem_total = get_memtotal()
+
+        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: Login guest and get the total guest memory")
+        second_mem_total = get_memtotal()
+
+        if autodeflate == "on":
+            if second_mem_total != init_mem_total:
+                test.fail("Total guest memory should not changed from '%d' to "
+                          "'%d'" % (init_mem_total, second_mem_total))
+        else:
+            if init_mem_total - second_mem_total != mem_value - set_mem:
+                test.fail("The difference between two memTotal values: '%d-%d'"
+                          " should be '%d'" % (init_mem_total, second_mem_total,
+                                               mem_value - set_mem))
+        test.log.debug("Get twice correct memTotal:'%d' and '%d'",
+                       init_mem_total, second_mem_total)
+
+        test.log.info("TEST_STEP6: Check the memory allocation")
+        dominfo = virsh.dominfo(vm_name, ignore_status=True, debug=True)
+        libvirt.check_result(dominfo, expected_match=dominfo_check)
+
+    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", "{}"))
+    autodeflate = params.get("autodeflate", '')
+    mem_value = int(params.get("mem_value"))
+    set_mem = int(params.get("set_mem"))
+    dominfo_check = params.get("dominfo_check")
+
+    try:
+        run_test()
+
+    finally:
+        teardown_test()

spell.ignore

@@ -31,6 +31,7 @@ augpath
 ausearch
 auth
 Auth
+autodeflate
 autodestroy
 autogenerated
 autologin