diff --git a/doc/faq.rst b/doc/faq.rst
index f94e0d730..7c806b2b6 100644
--- a/doc/faq.rst
+++ b/doc/faq.rst
@@ -26,8 +26,6 @@ physical memory on your platform. Check the documentation for these
 option settings for details:
 
 * :option:`hv.MEMORY.PLATFORM_RAM_SIZE`
-* :option:`hv.MEMORY.SOS_RAM_SIZE`
-* :option:`hv.MEMORY.UOS_RAM_SIZE`
 * :option:`hv.MEMORY.HV_RAM_SIZE`
 
 Check the :ref:`acrn_configuration_tool` for more information on how
diff --git a/misc/config_tools/data/apl-mrb/hybrid.xml b/misc/config_tools/data/apl-mrb/hybrid.xml
index bb5c79c7c..1f58de9c2 100644
--- a/misc/config_tools/data/apl-mrb/hybrid.xml
+++ b/misc/config_tools/data/apl-mrb/hybrid.xml
@@ -40,8 +40,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
@@ -137,7 +135,6 @@
     </clos>
     <memory>
         <start_hpa>0</start_hpa>
-        <size>CONFIG_SOS_RAM_SIZE</size>
     </memory>
     <os_config>
         <name>ACRN Service OS</name>
diff --git a/misc/config_tools/data/apl-mrb/industry.xml b/misc/config_tools/data/apl-mrb/industry.xml
index 196abf312..cdc8a04da 100644
--- a/misc/config_tools/data/apl-mrb/industry.xml
+++ b/misc/config_tools/data/apl-mrb/industry.xml
@@ -40,8 +40,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
diff --git a/misc/config_tools/data/apl-mrb/logical_partition.xml b/misc/config_tools/data/apl-mrb/logical_partition.xml
index 66eac3559..e431d7cf2 100644
--- a/misc/config_tools/data/apl-mrb/logical_partition.xml
+++ b/misc/config_tools/data/apl-mrb/logical_partition.xml
@@ -40,8 +40,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
diff --git a/misc/config_tools/data/apl-mrb/sdc.xml b/misc/config_tools/data/apl-mrb/sdc.xml
index 42cc6177d..b065f57f9 100644
--- a/misc/config_tools/data/apl-mrb/sdc.xml
+++ b/misc/config_tools/data/apl-mrb/sdc.xml
@@ -40,8 +40,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
@@ -72,7 +70,6 @@
     </clos>
     <memory>
         <start_hpa>0</start_hpa>
-        <size>CONFIG_SOS_RAM_SIZE</size>
     </memory>
     <os_config>
         <name>ACRN Service OS</name>
diff --git a/misc/config_tools/data/apl-up2-n3350/logical_partition.xml b/misc/config_tools/data/apl-up2-n3350/logical_partition.xml
index 85aa2dca0..1e358fde6 100644
--- a/misc/config_tools/data/apl-up2-n3350/logical_partition.xml
+++ b/misc/config_tools/data/apl-up2-n3350/logical_partition.xml
@@ -40,8 +40,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
diff --git a/misc/config_tools/data/apl-up2/hybrid.xml b/misc/config_tools/data/apl-up2/hybrid.xml
index 804882a51..18cd735d9 100644
--- a/misc/config_tools/data/apl-up2/hybrid.xml
+++ b/misc/config_tools/data/apl-up2/hybrid.xml
@@ -40,8 +40,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
@@ -137,7 +135,6 @@
     </clos>
     <memory>
         <start_hpa>0</start_hpa>
-        <size>CONFIG_SOS_RAM_SIZE</size>
     </memory>
     <os_config>
         <name>ACRN Service OS</name>
diff --git a/misc/config_tools/data/apl-up2/industry.xml b/misc/config_tools/data/apl-up2/industry.xml
index e09b37ece..44cf643e1 100644
--- a/misc/config_tools/data/apl-up2/industry.xml
+++ b/misc/config_tools/data/apl-up2/industry.xml
@@ -40,8 +40,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
diff --git a/misc/config_tools/data/apl-up2/logical_partition.xml b/misc/config_tools/data/apl-up2/logical_partition.xml
index f4f97fe27..9614df0af 100644
--- a/misc/config_tools/data/apl-up2/logical_partition.xml
+++ b/misc/config_tools/data/apl-up2/logical_partition.xml
@@ -40,8 +40,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
diff --git a/misc/config_tools/data/apl-up2/sdc.xml b/misc/config_tools/data/apl-up2/sdc.xml
index eb88eac31..405bed01e 100644
--- a/misc/config_tools/data/apl-up2/sdc.xml
+++ b/misc/config_tools/data/apl-up2/sdc.xml
@@ -40,8 +40,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
@@ -72,7 +70,6 @@
     </clos>
     <memory>
         <start_hpa>0</start_hpa>
-        <size>CONFIG_SOS_RAM_SIZE</size>
     </memory>
     <os_config>
         <name>ACRN Service OS</name>
diff --git a/misc/config_tools/data/cfl-k700-i7/hybrid_rt.xml b/misc/config_tools/data/cfl-k700-i7/hybrid_rt.xml
index 7ce9dc7b9..be4d24d84 100644
--- a/misc/config_tools/data/cfl-k700-i7/hybrid_rt.xml
+++ b/misc/config_tools/data/cfl-k700-i7/hybrid_rt.xml
@@ -36,8 +36,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x800000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x800000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
@@ -137,7 +135,6 @@
     </clos>
     <memory>
         <start_hpa>0</start_hpa>
-        <size>CONFIG_SOS_RAM_SIZE</size>
     </memory>
     <os_config>
         <name>ACRN Service OS</name>
diff --git a/misc/config_tools/data/cfl-k700-i7/industry.xml b/misc/config_tools/data/cfl-k700-i7/industry.xml
index 7135b12d0..537c38fd4 100644
--- a/misc/config_tools/data/cfl-k700-i7/industry.xml
+++ b/misc/config_tools/data/cfl-k700-i7/industry.xml
@@ -36,8 +36,6 @@
         <HV_RAM_SIZE>0x16800000</HV_RAM_SIZE>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x800000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x800000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
diff --git a/misc/config_tools/data/ehl-crb-b/fusa_partition.xml b/misc/config_tools/data/ehl-crb-b/fusa_partition.xml
index 971edb2e8..19e185aab 100644
--- a/misc/config_tools/data/ehl-crb-b/fusa_partition.xml
+++ b/misc/config_tools/data/ehl-crb-b/fusa_partition.xml
@@ -50,8 +50,6 @@
             <HV_RAM_SIZE/>
             <HV_RAM_START/>
             <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-            <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-            <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
             <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
         </MEMORY>
         <CAPACITIES>
diff --git a/misc/config_tools/data/ehl-crb-b/hybrid.xml b/misc/config_tools/data/ehl-crb-b/hybrid.xml
index 17a1ee370..6d7e501b6 100644
--- a/misc/config_tools/data/ehl-crb-b/hybrid.xml
+++ b/misc/config_tools/data/ehl-crb-b/hybrid.xml
@@ -50,8 +50,6 @@
             <HV_RAM_SIZE/>
             <HV_RAM_START/>
             <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-            <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-            <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
             <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
         </MEMORY>
         <CAPACITIES>
@@ -147,7 +145,6 @@
         </clos>
         <memory>
             <start_hpa>0</start_hpa>
-            <size>CONFIG_SOS_RAM_SIZE</size>
         </memory>
         <os_config>
             <name>ACRN Service OS</name>
diff --git a/misc/config_tools/data/ehl-crb-b/hybrid_rt.xml b/misc/config_tools/data/ehl-crb-b/hybrid_rt.xml
index fc5112cd7..ae56f1923 100644
--- a/misc/config_tools/data/ehl-crb-b/hybrid_rt.xml
+++ b/misc/config_tools/data/ehl-crb-b/hybrid_rt.xml
@@ -53,8 +53,6 @@
             <HV_RAM_SIZE/>
             <HV_RAM_START/>
             <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-            <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-            <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
             <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
         </MEMORY>
         <CAPACITIES>
@@ -148,7 +146,6 @@
         </clos>
         <memory>
             <start_hpa>0</start_hpa>
-            <size>CONFIG_SOS_RAM_SIZE</size>
         </memory>
         <os_config>
             <name>ACRN Service OS</name>
diff --git a/misc/config_tools/data/ehl-crb-b/hybrid_rt_fusa.xml b/misc/config_tools/data/ehl-crb-b/hybrid_rt_fusa.xml
index bb96b6feb..f211026d9 100644
--- a/misc/config_tools/data/ehl-crb-b/hybrid_rt_fusa.xml
+++ b/misc/config_tools/data/ehl-crb-b/hybrid_rt_fusa.xml
@@ -50,8 +50,6 @@
             <HV_RAM_SIZE/>
             <HV_RAM_START/>
             <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-            <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-            <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
             <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
         </MEMORY>
         <CAPACITIES>
@@ -148,7 +146,6 @@
         </clos>
         <memory>
             <start_hpa>0</start_hpa>
-            <size>CONFIG_SOS_RAM_SIZE</size>
         </memory>
         <os_config>
             <name>ACRN Service OS</name>
diff --git a/misc/config_tools/data/ehl-crb-b/industry.xml b/misc/config_tools/data/ehl-crb-b/industry.xml
index dbd83e9f7..5f326a2a3 100644
--- a/misc/config_tools/data/ehl-crb-b/industry.xml
+++ b/misc/config_tools/data/ehl-crb-b/industry.xml
@@ -53,8 +53,6 @@
             <HV_RAM_SIZE/>
             <HV_RAM_START/>
             <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-            <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-            <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
             <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
         </MEMORY>
         <CAPACITIES>
diff --git a/misc/config_tools/data/ehl-crb-b/logical_partition.xml b/misc/config_tools/data/ehl-crb-b/logical_partition.xml
index 1214d6d69..912bacab5 100644
--- a/misc/config_tools/data/ehl-crb-b/logical_partition.xml
+++ b/misc/config_tools/data/ehl-crb-b/logical_partition.xml
@@ -50,8 +50,6 @@
             <HV_RAM_SIZE/>
             <HV_RAM_START/>
             <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-            <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-            <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
             <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
         </MEMORY>
         <CAPACITIES>
diff --git a/misc/config_tools/data/ehl-crb-b/sdc.xml b/misc/config_tools/data/ehl-crb-b/sdc.xml
index 6da94f740..f3cf1c33c 100644
--- a/misc/config_tools/data/ehl-crb-b/sdc.xml
+++ b/misc/config_tools/data/ehl-crb-b/sdc.xml
@@ -50,8 +50,6 @@
             <HV_RAM_SIZE/>
             <HV_RAM_START/>
             <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-            <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-            <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
             <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
         </MEMORY>
         <CAPACITIES>
@@ -79,7 +77,6 @@
         </clos>
         <memory>
             <start_hpa>0</start_hpa>
-            <size>CONFIG_SOS_RAM_SIZE</size>
         </memory>
         <os_config>
             <name>ACRN Service OS</name>
diff --git a/misc/config_tools/data/generic_board/generic_code/hybrid/generic_board.config b/misc/config_tools/data/generic_board/generic_code/hybrid/generic_board.config
index ed99cee9d..6b28700ee 100644
--- a/misc/config_tools/data/generic_board/generic_code/hybrid/generic_board.config
+++ b/misc/config_tools/data/generic_board/generic_code/hybrid/generic_board.config
@@ -5,8 +5,6 @@ CONFIG_HV_RAM_START=0x11000000
 CONFIG_HV_RAM_SIZE=0x9600000
 CONFIG_PLATFORM_RAM_SIZE=0x400000000
 CONFIG_LOW_RAM_SIZE=0x00010000
-CONFIG_SOS_RAM_SIZE=0x400000000
-CONFIG_UOS_RAM_SIZE=0x200000000
 CONFIG_STACK_SIZE=0x2000
 CONFIG_IVSHMEM_ENABLED=n
 CONFIG_GPU_SBDF=0x00000010
diff --git a/misc/config_tools/data/generic_board/generic_code/hybrid/vm_configurations.c b/misc/config_tools/data/generic_board/generic_code/hybrid/vm_configurations.c
index 647e7dff0..bf9052980 100644
--- a/misc/config_tools/data/generic_board/generic_code/hybrid/vm_configurations.c
+++ b/misc/config_tools/data/generic_board/generic_code/hybrid/vm_configurations.c
@@ -80,7 +80,6 @@ struct acrn_vm_config vm_configs[CONFIG_MAX_VM_NUM] = {
 		.cpu_affinity = SOS_VM_CONFIG_CPU_AFFINITY,
 		.memory = {
 			.start_hpa = 0UL,
-			.size = CONFIG_SOS_RAM_SIZE,
 		},
 		.os_config = {
 			.name = "ACRN Service OS",
diff --git a/misc/config_tools/data/generic_board/generic_code/hybrid_rt/generic_board.config b/misc/config_tools/data/generic_board/generic_code/hybrid_rt/generic_board.config
index 4c1b57aa2..e887af67f 100644
--- a/misc/config_tools/data/generic_board/generic_code/hybrid_rt/generic_board.config
+++ b/misc/config_tools/data/generic_board/generic_code/hybrid_rt/generic_board.config
@@ -5,8 +5,6 @@ CONFIG_HV_RAM_START=0x11000000
 CONFIG_HV_RAM_SIZE=0xc000000
 CONFIG_PLATFORM_RAM_SIZE=0x400000000
 CONFIG_LOW_RAM_SIZE=0x00010000
-CONFIG_SOS_RAM_SIZE=0x400000000
-CONFIG_UOS_RAM_SIZE=0x200000000
 CONFIG_STACK_SIZE=0x2000
 CONFIG_IVSHMEM_ENABLED=y
 CONFIG_GPU_SBDF=0x00000010
diff --git a/misc/config_tools/data/generic_board/generic_code/hybrid_rt/vm_configurations.c b/misc/config_tools/data/generic_board/generic_code/hybrid_rt/vm_configurations.c
index 8ea49a44b..7a463409c 100644
--- a/misc/config_tools/data/generic_board/generic_code/hybrid_rt/vm_configurations.c
+++ b/misc/config_tools/data/generic_board/generic_code/hybrid_rt/vm_configurations.c
@@ -82,7 +82,6 @@ struct acrn_vm_config vm_configs[CONFIG_MAX_VM_NUM] = {
 		.cpu_affinity = SOS_VM_CONFIG_CPU_AFFINITY,
 		.memory = {
 			.start_hpa = 0UL,
-			.size = CONFIG_SOS_RAM_SIZE,
 		},
 		.os_config = {
 			.name = "ACRN Service OS",
diff --git a/misc/config_tools/data/generic_board/generic_code/industry/generic_board.config b/misc/config_tools/data/generic_board/generic_code/industry/generic_board.config
index 4c83090a3..216acbb0f 100644
--- a/misc/config_tools/data/generic_board/generic_code/industry/generic_board.config
+++ b/misc/config_tools/data/generic_board/generic_code/industry/generic_board.config
@@ -5,8 +5,6 @@ CONFIG_HV_RAM_START=0x11000000
 CONFIG_HV_RAM_SIZE=0x14800000
 CONFIG_PLATFORM_RAM_SIZE=0x400000000
 CONFIG_LOW_RAM_SIZE=0x00010000
-CONFIG_SOS_RAM_SIZE=0x400000000
-CONFIG_UOS_RAM_SIZE=0x200000000
 CONFIG_STACK_SIZE=0x2000
 CONFIG_IVSHMEM_ENABLED=n
 CONFIG_GPU_SBDF=0x00000010
diff --git a/misc/config_tools/data/generic_board/generic_code/industry/vm_configurations.c b/misc/config_tools/data/generic_board/generic_code/industry/vm_configurations.c
index 0ddfadc78..5f8c950a8 100644
--- a/misc/config_tools/data/generic_board/generic_code/industry/vm_configurations.c
+++ b/misc/config_tools/data/generic_board/generic_code/industry/vm_configurations.c
@@ -24,7 +24,6 @@ struct acrn_vm_config vm_configs[CONFIG_MAX_VM_NUM] = {
 		.cpu_affinity = SOS_VM_CONFIG_CPU_AFFINITY,
 		.memory = {
 			.start_hpa = 0UL,
-			.size = CONFIG_SOS_RAM_SIZE,
 		},
 		.os_config = {
 			.name = "ACRN Service OS",
diff --git a/misc/config_tools/data/generic_board/generic_code/logical_partition/generic_board.config b/misc/config_tools/data/generic_board/generic_code/logical_partition/generic_board.config
index cfc37d499..7cdca80e3 100644
--- a/misc/config_tools/data/generic_board/generic_code/logical_partition/generic_board.config
+++ b/misc/config_tools/data/generic_board/generic_code/logical_partition/generic_board.config
@@ -5,8 +5,6 @@ CONFIG_HV_RAM_START=0x11000000
 CONFIG_HV_RAM_SIZE=0x7800000
 CONFIG_PLATFORM_RAM_SIZE=0x400000000
 CONFIG_LOW_RAM_SIZE=0x00010000
-CONFIG_SOS_RAM_SIZE=0x400000000
-CONFIG_UOS_RAM_SIZE=0x200000000
 CONFIG_STACK_SIZE=0x2000
 CONFIG_IVSHMEM_ENABLED=n
 CONFIG_GPU_SBDF=0x00000010
diff --git a/misc/config_tools/data/generic_board/hybrid.xml b/misc/config_tools/data/generic_board/hybrid.xml
index 100bd2d8b..932dae85f 100644
--- a/misc/config_tools/data/generic_board/hybrid.xml
+++ b/misc/config_tools/data/generic_board/hybrid.xml
@@ -51,8 +51,6 @@
             <HV_RAM_SIZE/>
             <HV_RAM_START/>
             <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-            <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-            <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
             <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
         </MEMORY>
         <CAPACITIES>
@@ -148,7 +146,6 @@
         </clos>
         <memory>
             <start_hpa>0</start_hpa>
-            <size>CONFIG_SOS_RAM_SIZE</size>
         </memory>
         <os_config>
             <name>ACRN Service OS</name>
diff --git a/misc/config_tools/data/generic_board/hybrid_rt.xml b/misc/config_tools/data/generic_board/hybrid_rt.xml
index 8e8bcde0b..e8b89a940 100644
--- a/misc/config_tools/data/generic_board/hybrid_rt.xml
+++ b/misc/config_tools/data/generic_board/hybrid_rt.xml
@@ -51,8 +51,6 @@
             <HV_RAM_SIZE/>
             <HV_RAM_START/>
             <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-            <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-            <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
             <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
         </MEMORY>
         <CAPACITIES>
@@ -146,7 +144,6 @@
         </clos>
         <memory>
             <start_hpa>0</start_hpa>
-            <size>CONFIG_SOS_RAM_SIZE</size>
         </memory>
         <os_config>
             <name>ACRN Service OS</name>
diff --git a/misc/config_tools/data/generic_board/industry.xml b/misc/config_tools/data/generic_board/industry.xml
index 35d2fb207..8130836ef 100644
--- a/misc/config_tools/data/generic_board/industry.xml
+++ b/misc/config_tools/data/generic_board/industry.xml
@@ -51,8 +51,6 @@
             <HV_RAM_SIZE/>
             <HV_RAM_START/>
             <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-            <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-            <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
             <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
         </MEMORY>
         <CAPACITIES>
diff --git a/misc/config_tools/data/generic_board/logical_partition.xml b/misc/config_tools/data/generic_board/logical_partition.xml
index 250aceefc..f3008f651 100644
--- a/misc/config_tools/data/generic_board/logical_partition.xml
+++ b/misc/config_tools/data/generic_board/logical_partition.xml
@@ -51,8 +51,6 @@
             <HV_RAM_SIZE/>
             <HV_RAM_START/>
             <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-            <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-            <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
             <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
         </MEMORY>
         <CAPACITIES>
diff --git a/misc/config_tools/data/nuc6cayh/hybrid.xml b/misc/config_tools/data/nuc6cayh/hybrid.xml
index 727b3277f..a400a3a5b 100644
--- a/misc/config_tools/data/nuc6cayh/hybrid.xml
+++ b/misc/config_tools/data/nuc6cayh/hybrid.xml
@@ -40,8 +40,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
@@ -137,7 +135,6 @@
     </clos>
     <memory>
         <start_hpa>0</start_hpa>
-        <size>CONFIG_SOS_RAM_SIZE</size>
     </memory>
     <os_config>
         <name>ACRN Service OS</name>
diff --git a/misc/config_tools/data/nuc6cayh/industry.xml b/misc/config_tools/data/nuc6cayh/industry.xml
index 6a56f6fda..1acf6ee0d 100644
--- a/misc/config_tools/data/nuc6cayh/industry.xml
+++ b/misc/config_tools/data/nuc6cayh/industry.xml
@@ -40,8 +40,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
diff --git a/misc/config_tools/data/nuc6cayh/logical_partition.xml b/misc/config_tools/data/nuc6cayh/logical_partition.xml
index a984049d9..114d8199c 100644
--- a/misc/config_tools/data/nuc6cayh/logical_partition.xml
+++ b/misc/config_tools/data/nuc6cayh/logical_partition.xml
@@ -40,8 +40,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
diff --git a/misc/config_tools/data/nuc6cayh/sdc.xml b/misc/config_tools/data/nuc6cayh/sdc.xml
index 1c1441a49..e6e4ec3d7 100644
--- a/misc/config_tools/data/nuc6cayh/sdc.xml
+++ b/misc/config_tools/data/nuc6cayh/sdc.xml
@@ -40,8 +40,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
@@ -72,7 +70,6 @@
     </clos>
     <memory>
         <start_hpa>0</start_hpa>
-        <size>CONFIG_SOS_RAM_SIZE</size>
     </memory>
     <os_config>
         <name>ACRN Service OS</name>
diff --git a/misc/config_tools/data/nuc7i7dnb/hybrid.xml b/misc/config_tools/data/nuc7i7dnb/hybrid.xml
index 8dd09dfe4..4ac540f28 100644
--- a/misc/config_tools/data/nuc7i7dnb/hybrid.xml
+++ b/misc/config_tools/data/nuc7i7dnb/hybrid.xml
@@ -36,8 +36,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
@@ -133,7 +131,6 @@
     </clos>
     <memory>
         <start_hpa>0</start_hpa>
-        <size>CONFIG_SOS_RAM_SIZE</size>
     </memory>
     <os_config>
         <name>ACRN Service OS</name>
diff --git a/misc/config_tools/data/nuc7i7dnb/industry.xml b/misc/config_tools/data/nuc7i7dnb/industry.xml
index e82857b10..e59ffd51f 100644
--- a/misc/config_tools/data/nuc7i7dnb/industry.xml
+++ b/misc/config_tools/data/nuc7i7dnb/industry.xml
@@ -36,8 +36,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
diff --git a/misc/config_tools/data/nuc7i7dnb/logical_partition.xml b/misc/config_tools/data/nuc7i7dnb/logical_partition.xml
index f8c5b0fbd..83ff4fd23 100644
--- a/misc/config_tools/data/nuc7i7dnb/logical_partition.xml
+++ b/misc/config_tools/data/nuc7i7dnb/logical_partition.xml
@@ -36,8 +36,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
diff --git a/misc/config_tools/data/nuc7i7dnb/sdc.xml b/misc/config_tools/data/nuc7i7dnb/sdc.xml
index 986fd942e..66ed28020 100644
--- a/misc/config_tools/data/nuc7i7dnb/sdc.xml
+++ b/misc/config_tools/data/nuc7i7dnb/sdc.xml
@@ -36,8 +36,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
@@ -68,7 +66,6 @@
     </clos>
     <memory>
         <start_hpa>0</start_hpa>
-        <size>CONFIG_SOS_RAM_SIZE</size>
     </memory>
     <os_config>
         <name>ACRN Service OS</name>
diff --git a/misc/config_tools/data/qemu/sdc.xml b/misc/config_tools/data/qemu/sdc.xml
index a5584e61f..541353565 100644
--- a/misc/config_tools/data/qemu/sdc.xml
+++ b/misc/config_tools/data/qemu/sdc.xml
@@ -36,8 +36,6 @@
         <HV_RAM_SIZE>0x07800000</HV_RAM_SIZE>
         <HV_RAM_START>0x11000000</HV_RAM_START>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x20000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x100000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x100000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
@@ -68,7 +66,6 @@
     </clos>
     <memory>
         <start_hpa>0</start_hpa>
-        <size>CONFIG_SOS_RAM_SIZE</size>
     </memory>
     <os_config>
         <name>ACRN Service OS</name>
diff --git a/misc/config_tools/data/tgl-rvp/hybrid.xml b/misc/config_tools/data/tgl-rvp/hybrid.xml
index 500504515..eb2ea114f 100644
--- a/misc/config_tools/data/tgl-rvp/hybrid.xml
+++ b/misc/config_tools/data/tgl-rvp/hybrid.xml
@@ -36,8 +36,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x480000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x480000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
@@ -133,7 +131,6 @@
     </clos>
     <memory>
         <start_hpa>0</start_hpa>
-        <size>CONFIG_SOS_RAM_SIZE</size>
     </memory>
     <os_config>
         <name>ACRN Service OS</name>
diff --git a/misc/config_tools/data/tgl-rvp/hybrid_rt.xml b/misc/config_tools/data/tgl-rvp/hybrid_rt.xml
index 628cf35c0..714725d90 100644
--- a/misc/config_tools/data/tgl-rvp/hybrid_rt.xml
+++ b/misc/config_tools/data/tgl-rvp/hybrid_rt.xml
@@ -39,8 +39,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x480000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x480000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
@@ -135,7 +133,6 @@
     </clos>
     <memory>
         <start_hpa>0</start_hpa>
-        <size>CONFIG_SOS_RAM_SIZE</size>
     </memory>
     <os_config>
         <name>ACRN Service OS</name>
diff --git a/misc/config_tools/data/tgl-rvp/industry.xml b/misc/config_tools/data/tgl-rvp/industry.xml
index 926be0a7e..49ee0cbed 100644
--- a/misc/config_tools/data/tgl-rvp/industry.xml
+++ b/misc/config_tools/data/tgl-rvp/industry.xml
@@ -39,8 +39,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x480000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x480000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
diff --git a/misc/config_tools/data/tgl-rvp/logical_partition.xml b/misc/config_tools/data/tgl-rvp/logical_partition.xml
index c5e1b91c2..4f628cece 100644
--- a/misc/config_tools/data/tgl-rvp/logical_partition.xml
+++ b/misc/config_tools/data/tgl-rvp/logical_partition.xml
@@ -36,8 +36,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x480000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x480000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
diff --git a/misc/config_tools/data/tgl-rvp/sdc.xml b/misc/config_tools/data/tgl-rvp/sdc.xml
index a75308021..76d608d2f 100644
--- a/misc/config_tools/data/tgl-rvp/sdc.xml
+++ b/misc/config_tools/data/tgl-rvp/sdc.xml
@@ -36,8 +36,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x480000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x480000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
@@ -68,7 +66,6 @@
     </clos>
     <memory>
         <start_hpa>0</start_hpa>
-        <size>CONFIG_SOS_RAM_SIZE</size>
     </memory>
     <os_config>
         <name>ACRN Service OS</name>
diff --git a/misc/config_tools/data/whl-ipc-i5/hybrid.xml b/misc/config_tools/data/whl-ipc-i5/hybrid.xml
index 8baa591b4..52468f344 100644
--- a/misc/config_tools/data/whl-ipc-i5/hybrid.xml
+++ b/misc/config_tools/data/whl-ipc-i5/hybrid.xml
@@ -36,8 +36,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
@@ -133,7 +131,6 @@
     </clos>
     <memory>
         <start_hpa>0</start_hpa>
-        <size>CONFIG_SOS_RAM_SIZE</size>
     </memory>
     <os_config>
         <name>ACRN Service OS</name>
diff --git a/misc/config_tools/data/whl-ipc-i5/hybrid_rt.xml b/misc/config_tools/data/whl-ipc-i5/hybrid_rt.xml
index 944bd9964..7467e871a 100644
--- a/misc/config_tools/data/whl-ipc-i5/hybrid_rt.xml
+++ b/misc/config_tools/data/whl-ipc-i5/hybrid_rt.xml
@@ -36,8 +36,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
@@ -136,7 +134,6 @@
     </clos>
     <memory>
         <start_hpa>0</start_hpa>
-        <size>CONFIG_SOS_RAM_SIZE</size>
     </memory>
     <os_config>
         <name>ACRN Service OS</name>
diff --git a/misc/config_tools/data/whl-ipc-i5/industry.xml b/misc/config_tools/data/whl-ipc-i5/industry.xml
index 7e4f54cb6..e7dd9c653 100644
--- a/misc/config_tools/data/whl-ipc-i5/industry.xml
+++ b/misc/config_tools/data/whl-ipc-i5/industry.xml
@@ -36,8 +36,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
diff --git a/misc/config_tools/data/whl-ipc-i5/logical_partition.xml b/misc/config_tools/data/whl-ipc-i5/logical_partition.xml
index 3220e1672..8f54b0c3d 100644
--- a/misc/config_tools/data/whl-ipc-i5/logical_partition.xml
+++ b/misc/config_tools/data/whl-ipc-i5/logical_partition.xml
@@ -36,8 +36,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
diff --git a/misc/config_tools/data/whl-ipc-i5/sdc.xml b/misc/config_tools/data/whl-ipc-i5/sdc.xml
index 432ff42d1..184243b28 100644
--- a/misc/config_tools/data/whl-ipc-i5/sdc.xml
+++ b/misc/config_tools/data/whl-ipc-i5/sdc.xml
@@ -36,8 +36,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
@@ -68,7 +66,6 @@
     </clos>
     <memory>
         <start_hpa>0</start_hpa>
-        <size>CONFIG_SOS_RAM_SIZE</size>
     </memory>
     <os_config>
         <name>ACRN Service OS</name>
diff --git a/misc/config_tools/data/whl-ipc-i7/hybrid.xml b/misc/config_tools/data/whl-ipc-i7/hybrid.xml
index 8484d8371..801d2c790 100644
--- a/misc/config_tools/data/whl-ipc-i7/hybrid.xml
+++ b/misc/config_tools/data/whl-ipc-i7/hybrid.xml
@@ -36,8 +36,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
@@ -133,7 +131,6 @@
     </clos>
     <memory>
         <start_hpa>0</start_hpa>
-        <size>CONFIG_SOS_RAM_SIZE</size>
     </memory>
     <os_config>
         <name>ACRN Service OS</name>
diff --git a/misc/config_tools/data/whl-ipc-i7/hybrid_rt.xml b/misc/config_tools/data/whl-ipc-i7/hybrid_rt.xml
index 2ffccd75b..b2829ade5 100644
--- a/misc/config_tools/data/whl-ipc-i7/hybrid_rt.xml
+++ b/misc/config_tools/data/whl-ipc-i7/hybrid_rt.xml
@@ -36,8 +36,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
@@ -136,7 +134,6 @@
     </clos>
     <memory>
         <start_hpa>0</start_hpa>
-        <size>CONFIG_SOS_RAM_SIZE</size>
     </memory>
     <os_config>
         <name>ACRN Service OS</name>
diff --git a/misc/config_tools/data/whl-ipc-i7/industry.xml b/misc/config_tools/data/whl-ipc-i7/industry.xml
index c2d4d6e32..736de3040 100644
--- a/misc/config_tools/data/whl-ipc-i7/industry.xml
+++ b/misc/config_tools/data/whl-ipc-i7/industry.xml
@@ -36,8 +36,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
diff --git a/misc/config_tools/data/whl-ipc-i7/logical_partition.xml b/misc/config_tools/data/whl-ipc-i7/logical_partition.xml
index 434d87c9b..2f62a218e 100644
--- a/misc/config_tools/data/whl-ipc-i7/logical_partition.xml
+++ b/misc/config_tools/data/whl-ipc-i7/logical_partition.xml
@@ -36,8 +36,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
diff --git a/misc/config_tools/data/whl-ipc-i7/sdc.xml b/misc/config_tools/data/whl-ipc-i7/sdc.xml
index 284d7dd4e..a58fb43ba 100644
--- a/misc/config_tools/data/whl-ipc-i7/sdc.xml
+++ b/misc/config_tools/data/whl-ipc-i7/sdc.xml
@@ -40,8 +40,6 @@
         <HV_RAM_SIZE/>
         <HV_RAM_START/>
         <LOW_RAM_SIZE>0x00010000</LOW_RAM_SIZE>
-        <UOS_RAM_SIZE>0x200000000</UOS_RAM_SIZE>
-        <SOS_RAM_SIZE>0x400000000</SOS_RAM_SIZE>
         <PLATFORM_RAM_SIZE>0x400000000</PLATFORM_RAM_SIZE>
     </MEMORY>
 
@@ -72,7 +70,6 @@
     </clos>
     <memory>
         <start_hpa>0</start_hpa>
-        <size>CONFIG_SOS_RAM_SIZE</size>
     </memory>
     <os_config>
         <name>ACRN Service OS</name>
diff --git a/misc/config_tools/hv_config/board_defconfig.py b/misc/config_tools/hv_config/board_defconfig.py
index b9dcd2b4b..acef2d3d7 100644
--- a/misc/config_tools/hv_config/board_defconfig.py
+++ b/misc/config_tools/hv_config/board_defconfig.py
@@ -114,8 +114,6 @@ def get_memory(hv_info, config):
 
     print("CONFIG_PLATFORM_RAM_SIZE={}".format(hv_info.mem.platform_ram_size), file=config)
     print("CONFIG_LOW_RAM_SIZE={}".format(hv_info.mem.low_ram_size), file=config)
-    print("CONFIG_SOS_RAM_SIZE={}".format(hv_info.mem.sos_ram_size), file=config)
-    print("CONFIG_UOS_RAM_SIZE={}".format(hv_info.mem.uos_ram_size), file=config)
     print("CONFIG_STACK_SIZE={}".format(hv_info.mem.stack_size), file=config)
     print("CONFIG_IVSHMEM_ENABLED={}".format(hv_info.mem.ivshmem_enable), file=config)
 
diff --git a/misc/config_tools/hv_config/hv_item.py b/misc/config_tools/hv_config/hv_item.py
index 11e6c9866..a92245224 100644
--- a/misc/config_tools/hv_config/hv_item.py
+++ b/misc/config_tools/hv_config/hv_item.py
@@ -163,8 +163,6 @@ class Memory:
         self.hv_ram_size = common.get_hv_item_tag(self.hv_file, "MEMORY", "HV_RAM_SIZE")
         self.hv_ram_start = common.get_hv_item_tag(self.hv_file, "MEMORY", "HV_RAM_START")
         self.platform_ram_size = common.get_hv_item_tag(self.hv_file, "MEMORY", "PLATFORM_RAM_SIZE")
-        self.sos_ram_size = common.get_hv_item_tag(self.hv_file, "MEMORY", "SOS_RAM_SIZE")
-        self.uos_ram_size = common.get_hv_item_tag(self.hv_file, "MEMORY", "UOS_RAM_SIZE")
         self.ivshmem_enable = common.get_hv_item_tag(self.hv_file, "FEATURES", "IVSHMEM", "IVSHMEM_ENABLED")
         self.ivshmem_region = common.get_hv_item_tag(self.hv_file, "FEATURES", "IVSHMEM", "IVSHMEM_REGION")
 
@@ -172,8 +170,6 @@ class Memory:
         hv_cfg_lib.hv_size_check(self.stack_size, "MEMORY", "STACK_SIZE")
         hv_cfg_lib.hv_size_check(self.low_ram_size, "MEMORY", "LOW_RAM_SIZE")
         hv_cfg_lib.hv_size_check(self.platform_ram_size, "MEMORY", "PLATFORM_RAM_SIZE")
-        hv_cfg_lib.hv_size_check(self.sos_ram_size, "MEMORY", "SOS_RAM_SIZE")
-        hv_cfg_lib.hv_size_check(self.uos_ram_size, "MEMORY", "UOS_RAM_SIZE")
         hv_cfg_lib.ny_support_check(self.ivshmem_enable, "FEATURES", "IVSHMEM", "IVSHMEM_ENABLED")
 
 
diff --git a/misc/config_tools/library/scenario_cfg_lib.py b/misc/config_tools/library/scenario_cfg_lib.py
index 612c97b9a..02b1635d0 100644
--- a/misc/config_tools/library/scenario_cfg_lib.py
+++ b/misc/config_tools/library/scenario_cfg_lib.py
@@ -32,7 +32,7 @@ VUART_IRQ = ['SOS_COM1_IRQ', 'SOS_COM2_IRQ', 'COM1_IRQ', 'COM2_IRQ', 'COM3_IRQ',
 
 # Support 512M, 1G, 2G
 # pre launch less then 2G, sos vm less than 24G
-START_HPA_SIZE_LIST = ['0x20000000', '0x40000000', '0x80000000', 'CONFIG_SOS_RAM_SIZE']
+START_HPA_SIZE_LIST = ['0x20000000', '0x40000000', '0x80000000']
 
 COMMUNICATE_VM_ID = []
 
diff --git a/misc/config_tools/scenario_config/vm_configurations_c.py b/misc/config_tools/scenario_config/vm_configurations_c.py
index 4fa512d24..2882685af 100644
--- a/misc/config_tools/scenario_config/vm_configurations_c.py
+++ b/misc/config_tools/scenario_config/vm_configurations_c.py
@@ -260,7 +260,6 @@ def gen_sos_vm(vm_type, vm_i, scenario_items, config):
     cpu_affinity_output(vm_info, vm_i, config)
     print("\t\t.memory = {", file=config)
     print("\t\t\t.start_hpa = {}UL,".format(vm_info.mem_info.mem_start_hpa[vm_i]), file=config)
-    print("\t\t\t.size = {0},".format("CONFIG_SOS_RAM_SIZE"), file=config)
     print("\t\t},", file=config)
     print("\t\t.os_config = {", file=config)
     print('\t\t\t.name = "{0}",'.format(vm_info.os_cfg.kern_name[vm_i]), file=config)
diff --git a/misc/config_tools/schema/VMtypes.xsd b/misc/config_tools/schema/VMtypes.xsd
index 94f905d3b..329d5ba26 100644
--- a/misc/config_tools/schema/VMtypes.xsd
+++ b/misc/config_tools/schema/VMtypes.xsd
@@ -111,7 +111,7 @@ aligned.</xs:documentation>
 VM.</xs:documentation>
       </xs:annotation>
     </xs:element>
-    <xs:element name="size" type="MemorySizeType" default="0x20000000">
+    <xs:element name="size" type="MemorySizeType" default="0x20000000" minOccurs="0">
       <xs:annotation>
         <xs:documentation>The memory size in bytes for the VM. Default
 value is ``0x200000000``.</xs:documentation>
diff --git a/misc/config_tools/schema/config.xsd b/misc/config_tools/schema/config.xsd
index 251500c1f..0779b7372 100644
--- a/misc/config_tools/schema/config.xsd
+++ b/misc/config_tools/schema/config.xsd
@@ -186,18 +186,6 @@ the RAM region used by the hypervisor.</xs:documentation>
 ``0x10000``, starting from address ``0x0``.</xs:documentation>
       </xs:annotation>
     </xs:element>
-    <xs:element name="UOS_RAM_SIZE" type="HexFormat" default="0x200000000">
-      <xs:annotation>
-        <xs:documentation>Size of the User VM OS RAM region. Default
-value ``0x200000000``.</xs:documentation>
-      </xs:annotation>
-    </xs:element>
-    <xs:element name="SOS_RAM_SIZE" type="HexFormat" default="0x400000000">
-      <xs:annotation>
-        <xs:documentation>Size of the Service VM OS RAM region. Default
-value ``0x400000000``.</xs:documentation>
-      </xs:annotation>
-    </xs:element>
     <xs:element name="PLATFORM_RAM_SIZE" type="HexFormat" default="0x400000000">
       <xs:annotation>
         <xs:documentation>Size of the physical platform RAM. Default
diff --git a/misc/config_tools/schema/types.xsd b/misc/config_tools/schema/types.xsd
index 96885fd68..0a928cdc0 100644
--- a/misc/config_tools/schema/types.xsd
+++ b/misc/config_tools/schema/types.xsd
@@ -57,17 +57,11 @@
   <xs:union memberTypes="None MaxMsixTableNumType" />
 </xs:simpleType>
 
-<xs:simpleType name="SOSRamSize">
-  <xs:restriction base="xs:string">
-    <xs:enumeration value="CONFIG_SOS_RAM_SIZE" />
-  </xs:restriction>
-</xs:simpleType>
-
 <xs:simpleType name="MemorySizeType">
   <xs:annotation>
     <xs:documentation>An Integer value in hexadecimal format.</xs:documentation>
   </xs:annotation>
-  <xs:union memberTypes="SOSRamSize HexFormat" />
+  <xs:union memberTypes="HexFormat" />
 </xs:simpleType>
 
 <xs:simpleType name="LogLevelType">
diff --git a/misc/config_tools/xforms/config_common.xsl b/misc/config_tools/xforms/config_common.xsl
index a7a4cb004..487437a7e 100644
--- a/misc/config_tools/xforms/config_common.xsl
+++ b/misc/config_tools/xforms/config_common.xsl
@@ -139,14 +139,6 @@
       <xsl:with-param name="key" select="'LOW_RAM_SIZE'" />
     </xsl:call-template>
 
-    <xsl:call-template name="integer-by-key">
-      <xsl:with-param name="key" select="'SOS_RAM_SIZE'" />
-    </xsl:call-template>
-
-    <xsl:call-template name="integer-by-key">
-      <xsl:with-param name="key" select="'UOS_RAM_SIZE'" />
-    </xsl:call-template>
-
     <xsl:call-template name="integer-by-key">
       <xsl:with-param name="key" select="'STACK_SIZE'" />
     </xsl:call-template>