diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c18dd8d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+__pycache__/
diff --git a/KVM/qemu/boot_check.cfg b/KVM/qemu/boot_check.cfg
index 2a3597e..b13be7e 100644
--- a/KVM/qemu/boot_check.cfg
+++ b/KVM/qemu/boot_check.cfg
@@ -37,6 +37,8 @@
             mem = 4096
         - 16G:
             mem = 16384
+        - max_mem:
+            is_max_mem = yes
     variants:
         - vm:
         - tdvm:
diff --git a/KVM/qemu/tests/boot_check.py b/KVM/qemu/tests/boot_check.py
index 15a64ed..d62192f 100644
--- a/KVM/qemu/tests/boot_check.py
+++ b/KVM/qemu/tests/boot_check.py
@@ -10,6 +10,7 @@
 from avocado.utils import cpu
 from virttest import env_process
 from virttest import error_context
+from virttest import utils_misc
 
 
 @error_context.context_aware
@@ -41,7 +42,11 @@ def run(test, params, env):
     vcpus = params.get_numeric("smp")
     if vm.get_cpu_count() != vcpus:
         test.fail("CPU number in guest is not same as configured vcpus number")
-    memory = params.get_numeric("mem")
-    if vm.get_totalmem_sys()//1024 != memory:
-        test.fail("Memory in guest is not same as configured")
+    is_max_mem = params.get_boolean("is_max_mem")
+    if is_max_mem:
+        memory = utils_misc.get_usable_memory_size()
+    else:
+        memory = params.get_numeric("mem")
+        if vm.get_totalmem_sys()//1024 != memory:
+            test.fail("Memory in guest is not same as configured")
     session.close()