block_hotplug_with_max_map_count: creates new test case

Creates new test case that boots up a VM with a small max_map_count,
then hotplugs 15 disks and checks the VM status.

Signed-off-by: mcasquer <[email protected]>

qemu/tests/block_hotplug_with_max_map_count.py

@@ -0,0 +1,55 @@
+from avocado.utils import process
+from virttest import env_process
+
+
+def run(test, params, env):
+    """
+    Block hotplug with vm.max_map_count test
+    1) Boot the VM with a small max_map_count
+    2) Hotplug 15 block devices
+    3) Login and check the VM status
+
+    :param test: QEMU test object
+    :param params: Dictionary with the test parameters
+    :param env: Dictionary with test environment
+    """
+
+    try:
+        test.log.info("Setting max_map_count to 3072")
+        orig_value = process.system_output("sysctl -n vm.max_map_count", shell=True)
+        process.system("sysctl vm.max_map_count=3072", shell=True)
+
+        extra_image_number = params.get_numeric("extra_image_number", 15)
+        timeout = params.get_numeric("login_timeout", 240)
+
+        for img_number in range(extra_image_number):
+            img = f"stg{img_number}"
+            params[f"boot_drive_{img}"] = "no"
+            params[f"image_name_{img}"] = f"images/{img}"
+            params[f"image_size_{img}"] = "1G"
+            params[f"remove_image_{img}"] = "yes"
+            params[f"force_create_image_{img}"] = "yes"
+            params[f"blk_extra_params_{img}"] = f"serial={img}"
+            image_params = params.object_params(img)
+            env_process.preprocess_image(test, image_params, img)
+
+        params["start_vm"] = "yes"
+        vm_name = params["main_vm"]
+        env_process.preprocess_vm(test, params, env, vm_name)
+        vm = env.get_vm(vm_name)
+        vm.verify_alive()
+        session = vm.wait_for_login(timeout=timeout)
+
+        for img_number in range(extra_image_number):
+            img = f"stg{img_number}"
+            image_params = params.object_params(img)
+            devs = vm.devices.images_define_by_params(img, image_params, "disk")
+            for dev in devs:
+                vm.devices.simple_hotplug(dev, vm.monitor)
+        if "running" not in vm.monitor.get_status():
+            test.fail(f"VM is not running!, status: {vm.monitor.get_status()}")
+        session.close()
+
+    finally:
+        test.log.info("Restoring max_map_count original value")
+        process.system(f"sysctl vm.max_map_count={orig_value}", shell=True)

qemu/tests/cfg/block_hotplug_with_max_map_count.cfg

@@ -0,0 +1,26 @@
+- block_hotplug_with_max_map_count:
+    only Linux
+    only virtio_blk
+    only x86_64
+    type = block_hotplug_with_max_map_count
+    virt_test_type = qemu
+    login_timeout = 240
+    start_vm = no
+    slots_mem = 20
+    maxmem_mem = 80G
+    mem = 4096
+    pcie_extra_root_port = 30
+    images += " stg1 stg2"
+    extra_image_number = 15
+    boot_drive_stg1 = yes
+    image_name_stg1 = images/stg1
+    image_size_stg1 = 1G
+    remove_image_stg1 = yes
+    force_create_image_stg1 = yes
+    blk_extra_params_stg1 = "serial=stg1"
+    boot_drive_stg2 = yes
+    image_name_stg2 = images/stg2
+    image_size_stg2 = 1G
+    remove_image_stg2 = yes
+    force_create_image_stg2 = yes
+    blk_extra_params_stg2 = "serial=stg2"