diff --git a/devices/srv3/default.nix b/devices/srv3/default.nix
index 4103524f..ca3ae1be 100644
--- a/devices/srv3/default.nix
+++ b/devices/srv3/default.nix
@@ -36,13 +36,13 @@ inputs:
         {
           alikia =
           {
-            memoryMB = 1024;
+            memory.sizeMB = 1024;
             cpus = 1;
             network = { address = 2; portForward.tcp = [{ host = 5689; guest = 22; }]; };
           };
           pen =
           {
-            memoryMB = 512;
+            memory.sizeMB = 512;
             cpus = 1;
             network =
             {
@@ -64,7 +64,7 @@ inputs:
           test =
           {
             owner = "chn";
-            memoryMB = 512;
+            memory.sizeMB = 512;
             cpus = 1;
             network =
             {
@@ -75,7 +75,7 @@ inputs:
           };
           reonokiy =
           {
-            memoryMB = 4 * 1024;
+            memory.sizeMB = 4 * 1024;
             cpus = 4;
             network = { address = 5; portForward.tcp = [{ host = 5694; guest = 22; }]; };
           };
diff --git a/devices/test-pc/default.nix b/devices/test-pc/default.nix
index 294e4246..42e07625 100644
--- a/devices/test-pc/default.nix
+++ b/devices/test-pc/default.nix
@@ -29,7 +29,7 @@ inputs:
           {
             chn =
             {
-              memoryMB = 2048;
+              memory.sizeMB = 2048;
               cpus = 4;
               network =
               {
@@ -40,7 +40,8 @@ inputs:
             chn2 =
             {
               owner = "chn";
-              memoryMB = 2048; cpus = 4;
+              memory.sizeMB = 2048;
+              cpus = 4;
               network = { address = 3; portForward.tcp = [{ host = 5694; guest = 22; }]; };
             };
           };
diff --git a/modules/services/nixvirt.nix b/modules/services/nixvirt.nix
index 0f4ee788..c44940de 100644
--- a/modules/services/nixvirt.nix
+++ b/modules/services/nixvirt.nix
@@ -23,7 +23,11 @@ inputs:
               name = mkOption { type = types.nonEmptyStr; default = submoduleInputs.config._module.args.name; };
               nodatacow = mkOption { type = types.bool; default = false; };
             };
-            memoryMB = mkOption { type = types.ints.unsigned; };
+            memory =
+            {
+              sizeMB = mkOption { type = types.ints.unsigned; };
+              dedicate = mkOption { type = types.bool; default = false; };
+            };
             cpus = mkOption { type = types.ints.unsigned; };
             network =
             {
@@ -140,7 +144,13 @@ inputs:
             inherit (vm.value) uuid;
             type = "kvm";
             vcpu = { placement = "static"; count = vm.value.cpus; };
-            memory = { count = vm.value.memoryMB; unit = "MiB"; };
+            memory =
+            {
+              count = vm.value.memory.sizeMB;
+              unit = "MiB";
+              nosharepages = vm.value.memory.dedicate;
+              locked = vm.value.memory.dedicate;
+            };
             os =
             {
               type = "hvm";