diff --git a/guest-test/common.json b/guest-test/common.json
new file mode 100644
index 0000000..04d92b0
--- /dev/null
+++ b/guest-test/common.json
@@ -0,0 +1,10 @@
+{
+  "kernel_img": "/boot/vmlinuz-xxx-yyy",
+  "initrd_img": "/boot/initramfs-xxx-yyy",
+  "bios_img": "/path/to/EDKII/OVMF.fd or other virtual BIOS",
+  "qemu_img": "/path/to/qemu-kvm with proper capabilty of VM test",
+  "guest_img": "/path/to/prepared/guest_os_image, in qcow2 or raw image format",
+  "guest_img_format": "raw",
+  "boot_pattern": "*Kernel*on*an*x86_64*",
+  "guest_root_passwd": "123456"
+}
\ No newline at end of file
diff --git a/guest-test/guest.test_launcher.sh b/guest-test/guest.test_launcher.sh
index 2c5a05a..ae091c5 100755
--- a/guest-test/guest.test_launcher.sh
+++ b/guest-test/guest.test_launcher.sh
@@ -63,6 +63,7 @@ NOTE!! args passed here will override params in qemu.confg.json
   -c guest kernel extra commandline
   -p guest pmu off/on
   -g [optional, default off] code coverage test mode off/on
+  -i [optional] path under guest-test to standalone common.json file
   -j [optional] path under guest-test to standalone qemu.config.json file
   -h HELP info
 EOF
@@ -105,7 +106,7 @@ echo PORT="$PORT" > "$SCRIPT_DIR"/test_params.py
 # used across test_launcher.sh, qemu_runner.py, test_executor.sh
 
 # get args for QEMU boot configurable parameters
-while getopts :v:s:m:d:t:x:c:p:g:j:h arg; do
+while getopts :v:s:m:d:t:x:c:p:g:i:j:h arg; do
   case $arg in
     v)
       VCPU=$OPTARG
@@ -143,9 +144,13 @@ while getopts :v:s:m:d:t:x:c:p:g:j:h arg; do
       GCOV=$OPTARG
       echo GCOV="\"$GCOV\"" >> "$SCRIPT_DIR"/test_params.py
       ;;
+    i)
+      JSON_C=$OPTARG
+      echo JSON_C="\"$JSON_C\"" >> "$SCRIPT_DIR"/test_params.py
+      ;;
     j)
-      JSON=$OPTARG
-      echo JSON="\"$JSON\"" >> "$SCRIPT_DIR"/test_params.py
+      JSON_Q=$OPTARG
+      echo JSON_Q="\"$JSON_Q\"" >> "$SCRIPT_DIR"/test_params.py
       ;;
     h)
       usage && exit 0
diff --git a/guest-test/osv_sanity/common.json b/guest-test/osv_sanity/common.json
new file mode 100644
index 0000000..04d92b0
--- /dev/null
+++ b/guest-test/osv_sanity/common.json
@@ -0,0 +1,10 @@
+{
+  "kernel_img": "/boot/vmlinuz-xxx-yyy",
+  "initrd_img": "/boot/initramfs-xxx-yyy",
+  "bios_img": "/path/to/EDKII/OVMF.fd or other virtual BIOS",
+  "qemu_img": "/path/to/qemu-kvm with proper capabilty of VM test",
+  "guest_img": "/path/to/prepared/guest_os_image, in qcow2 or raw image format",
+  "guest_img_format": "raw",
+  "boot_pattern": "*Kernel*on*an*x86_64*",
+  "guest_root_passwd": "123456"
+}
\ No newline at end of file
diff --git a/guest-test/osv_sanity/qemu.config.default.json b/guest-test/osv_sanity/qemu.config.default.json
index 786d085..4e166c0 100644
--- a/guest-test/osv_sanity/qemu.config.default.json
+++ b/guest-test/osv_sanity/qemu.config.default.json
@@ -1,13 +1,5 @@
 {
   "common": {
-    "kernel_img": "/boot/vmlinuz-xxx-yyy",
-    "initrd_img": "/boot/initramfs-xxx-yyy",
-    "bios_img": "/path/to/EDKII/OVMF.fd or other virtual BIOS",
-    "qemu_img": "/path/to/qemu-kvm with proper capabilty of VM test",
-    "guest_img": "/path/to/prepared/guest_os_image, in qcow2 or raw image format",
-    "guest_img_format": "raw",
-    "boot_pattern": "*Kernel*on*an*x86_64*",
-    "guest_root_passwd": "123456",
     "vm_type": "tdx",
     "pmu": "off",
     "cpus": "4",
@@ -26,7 +18,7 @@
     "cfg_var_3": "-smp cpus=$VCPU,sockets=$SOCKETS ",
     "cfg_var_4": "-m $MEMG ",
     "cfg_var_5": "-kernel $KERNEL_IMG ",
-    "cfg_var_6": "-initrd $INITRD_IMG",
+    "cfg_var_6": "-initrd $INITRD_IMG ",
     "cfg_var_7": "-netdev user,id=mynet0,hostfwd=tcp::$PORT-:22 ",
     "cfg_var_8": "-drive file=$GUEST_IMG,if=virtio,format=$IMG_FORMAT ",
     "cfg_var_9": "-append \"root=/dev/vda3 ro console=hvc0 earlyprintk=ttyS0 ignore_loglevel debug earlyprintk l1tf=off initcall_debug log_buf_len=200M nokaslr tsc=reliable efi=debug mce=off efi=debug $CMDLINE\" ",
diff --git a/guest-test/osv_sanity/qemu.config.tsc.json b/guest-test/osv_sanity/qemu.config.tsc.json
index 91ff82d..9ec9b1d 100644
--- a/guest-test/osv_sanity/qemu.config.tsc.json
+++ b/guest-test/osv_sanity/qemu.config.tsc.json
@@ -1,13 +1,5 @@
 {
   "common": {
-    "kernel_img": "/boot/vmlinuz-xxx-yyy",
-    "initrd_img": "/boot/initramfs-xxx-yyy",
-    "bios_img": "/path/to/EDKII/OVMF.fd or other virtual BIOS",
-    "qemu_img": "/path/to/qemu-kvm with proper capabilty of VM test",
-    "guest_img": "/path/to/prepared/guest_os_image, in qcow2 or raw image format",
-    "guest_img_format": "raw",
-    "boot_pattern": "*Kernel*on*an*x86_64*",
-    "guest_root_passwd": "123456",
     "vm_type": "tdx",
     "pmu": "off",
     "cpus": "4",
@@ -26,7 +18,7 @@
     "cfg_var_3": "-smp cpus=$VCPU,sockets=$SOCKETS ",
     "cfg_var_4": "-m $MEMG ",
     "cfg_var_5": "-kernel $KERNEL_IMG ",
-    "cfg_var_6": "-initrd $INITRD_IMG",
+    "cfg_var_6": "-initrd $INITRD_IMG ",
     "cfg_var_7": "-netdev user,id=mynet0,hostfwd=tcp::$PORT-:22 ",
     "cfg_var_8": "-drive file=$GUEST_IMG,if=virtio,format=$IMG_FORMAT ",
     "cfg_var_9": "-append \"root=/dev/vda3 ro console=hvc0 earlyprintk=ttyS0 ignore_loglevel debug earlyprintk l1tf=off initcall_debug log_buf_len=200M nokaslr tsc=reliable efi=debug mce=off efi=debug $CMDLINE\" ",
diff --git a/guest-test/osv_sanity/test_2.1.1.4 b/guest-test/osv_sanity/test_2.1.1.4
index e839ae8..dc4337a 100755
--- a/guest-test/osv_sanity/test_2.1.1.4
+++ b/guest-test/osv_sanity/test_2.1.1.4
@@ -1,4 +1,4 @@
 # Create TDX guest with default qemu config and check TSC value on guest
-guest.test_launcher.sh -v 1 -s 1 -m 4 -d on -t tdx -x TD_TSC_DEFAULT -p off -j "osv_sanity/qemu.config.default.json"
+guest.test_launcher.sh -v 1 -s 1 -m 4 -d on -t tdx -x TD_TSC_DEFAULT -p off -i "osv_sanity/common.json" -j "osv_sanity/qemu.config.default.json"
 # Create TDX guest with tsc-freq specified qemu config and check TSC value on guest
-guest.test_launcher.sh -v 1 -s 1 -m 4 -d on -t tdx -x TD_TSC_CONFIG -p off -j "osv_sanity/qemu.config.tsc.json"
\ No newline at end of file
+guest.test_launcher.sh -v 1 -s 1 -m 4 -d on -t tdx -x TD_TSC_CONFIG -p off -i "osv_santiy/common.json" -j "osv_sanity/qemu.config.tsc.json"
\ No newline at end of file
diff --git a/guest-test/qemu.config.json b/guest-test/qemu.config.json
index 786d085..4e166c0 100644
--- a/guest-test/qemu.config.json
+++ b/guest-test/qemu.config.json
@@ -1,13 +1,5 @@
 {
   "common": {
-    "kernel_img": "/boot/vmlinuz-xxx-yyy",
-    "initrd_img": "/boot/initramfs-xxx-yyy",
-    "bios_img": "/path/to/EDKII/OVMF.fd or other virtual BIOS",
-    "qemu_img": "/path/to/qemu-kvm with proper capabilty of VM test",
-    "guest_img": "/path/to/prepared/guest_os_image, in qcow2 or raw image format",
-    "guest_img_format": "raw",
-    "boot_pattern": "*Kernel*on*an*x86_64*",
-    "guest_root_passwd": "123456",
     "vm_type": "tdx",
     "pmu": "off",
     "cpus": "4",
@@ -26,7 +18,7 @@
     "cfg_var_3": "-smp cpus=$VCPU,sockets=$SOCKETS ",
     "cfg_var_4": "-m $MEMG ",
     "cfg_var_5": "-kernel $KERNEL_IMG ",
-    "cfg_var_6": "-initrd $INITRD_IMG",
+    "cfg_var_6": "-initrd $INITRD_IMG ",
     "cfg_var_7": "-netdev user,id=mynet0,hostfwd=tcp::$PORT-:22 ",
     "cfg_var_8": "-drive file=$GUEST_IMG,if=virtio,format=$IMG_FORMAT ",
     "cfg_var_9": "-append \"root=/dev/vda3 ro console=hvc0 earlyprintk=ttyS0 ignore_loglevel debug earlyprintk l1tf=off initcall_debug log_buf_len=200M nokaslr tsc=reliable efi=debug mce=off efi=debug $CMDLINE\" ",
diff --git a/guest-test/qemu_get_config.py b/guest-test/qemu_get_config.py
index 98e59d5..5d79b71 100755
--- a/guest-test/qemu_get_config.py
+++ b/guest-test/qemu_get_config.py
@@ -25,26 +25,31 @@
 # read from qemu.config.json format for all raw qemu vm config
 cwd = Path(os.getcwd())
 if cwd.stem == "guest-test":
-  if JSON is not None:
-    # customized qemu.confg.xxx.json located by JSON under guest-test folder
-    raw_config = Path(os.path.join(f"{os.getcwd()}/", JSON)).read_text()
-  else:
+  try:
+    JSON
+  except NameError:
     # default qemu.config.json under guest-test
+    common_config = Path(f"{os.getcwd()}/common.json").read_text()
     raw_config = Path(f"{os.getcwd()}/qemu.config.json").read_text()
+  else:
+    # customized qemu.confg.xxx.json located by JSON under guest-test folder
+    common_config = Path(os.path.join(f"{os.getcwd()}/", JSON_C)).read_text()
+    raw_config = Path(os.path.join(f"{os.getcwd()}/", JSON_Q)).read_text()
 else:
   exit(1)
 
+image_config = json.loads(common_config)
 qemu_config = json.loads(raw_config)
 
-# pre-config G-list variables' values confirmed by qemu.config.json
-kernel_img = qemu_config["common"]["kernel_img"]
-initrd_img = qemu_config["common"]["initrd_img"]
-bios_img = qemu_config["common"]["bios_img"]
-qemu_img = qemu_config["common"]["qemu_img"]
-guest_img = qemu_config["common"]["guest_img"]
-guest_img_format = qemu_config["common"]["guest_img_format"]
-boot_pattern = qemu_config["common"]["boot_pattern"]
-guest_root_passwd = qemu_config["common"]["guest_root_passwd"]
+# pre-config G-list variables' values confirmed by common.json
+kernel_img = image_config["kernel_img"]
+initrd_img = image_config["initrd_img"]
+bios_img = image_config["bios_img"]
+qemu_img = image_config["qemu_img"]
+guest_img = image_config["guest_img"]
+guest_img_format = image_config["guest_img_format"]
+boot_pattern = image_config["boot_pattern"]
+guest_root_passwd = image_config["guest_root_passwd"]
 port = PORT
 port_tel = port - 1000