diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 1fe7bfb..cf14b1f 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -310,8 +310,13 @@ static void pc_init_pci(MachineState *machine)
     pc_init1(machine, 1, 1);
 }
 
+static void pc_compat_2_3(MachineState *machine)
+{
+}
+
 static void pc_compat_2_2(MachineState *machine)
 {
+    pc_compat_2_3(machine);
     rsdp_in_ram = false;
     x86_cpu_compat_set_features("kvm64", FEAT_1_EDX, 0, CPUID_VME);
     x86_cpu_compat_set_features("kvm32", FEAT_1_EDX, 0, CPUID_VME);
@@ -413,6 +418,12 @@ static void pc_compat_1_2(MachineState *machine)
     x86_cpu_compat_kvm_no_autoenable(FEAT_KVM, 1 << KVM_FEATURE_PV_EOI);
 }
 
+static void pc_init_pci_2_3(MachineState *machine)
+{
+    pc_compat_2_3(machine);
+    pc_init_pci(machine);
+}
+
 static void pc_init_pci_2_2(MachineState *machine)
 {
     pc_compat_2_2(machine);
@@ -512,25 +523,41 @@ static void pc_xen_hvm_init(MachineState *machine)
     .desc = "Standard PC (i440FX + PIIX, 1996)", \
     .hot_add_cpu = pc_hot_add_cpu
 
-#define PC_I440FX_2_3_MACHINE_OPTIONS                           \
+#define PC_I440FX_2_4_MACHINE_OPTIONS                           \
     PC_I440FX_MACHINE_OPTIONS,                                  \
     .default_machine_opts = "firmware=bios-256k.bin",           \
     .default_display = "std"
 
-static QEMUMachine pc_i440fx_machine_v2_3 = {
-    PC_I440FX_2_3_MACHINE_OPTIONS,
-    .name = "pc-i440fx-2.3",
+static QEMUMachine pc_i440fx_machine_v2_4 = {
+    PC_I440FX_2_4_MACHINE_OPTIONS,
+    .name = "pc-i440fx-2.4",
     .alias = "pc",
     .init = pc_init_pci,
     .is_default = 1,
 };
 
+#define PC_I440FX_2_3_MACHINE_OPTIONS PC_I440FX_2_4_MACHINE_OPTIONS
+
+static QEMUMachine pc_i440fx_machine_v2_3 = {
+    PC_I440FX_2_3_MACHINE_OPTIONS,
+    .name = "pc-i440fx-2.3",
+    .init = pc_init_pci_2_3,
+    .compat_props = (GlobalProperty[]) {
+        PC_COMPAT_2_3,
+        { /* end of list */ }
+    },
+};
+
 #define PC_I440FX_2_2_MACHINE_OPTIONS PC_I440FX_2_3_MACHINE_OPTIONS
 
 static QEMUMachine pc_i440fx_machine_v2_2 = {
     PC_I440FX_2_2_MACHINE_OPTIONS,
     .name = "pc-i440fx-2.2",
     .init = pc_init_pci_2_2,
+    .compat_props = (GlobalProperty[]) {
+        PC_COMPAT_2_3,
+        { /* end of list */ }
+    },
 };
 
 #define PC_I440FX_2_1_MACHINE_OPTIONS                           \
@@ -543,6 +570,7 @@ static QEMUMachine pc_i440fx_machine_v2_1 = {
     .init = pc_init_pci_2_1,
     .compat_props = (GlobalProperty[]) {
         HW_COMPAT_2_1,
+        PC_COMPAT_2_3,
         { /* end of list */ }
     },
 };
@@ -970,6 +998,7 @@ static QEMUMachine xenfv_machine = {
 
 static void pc_machine_init(void)
 {
+    qemu_register_pc_machine(&pc_i440fx_machine_v2_4);
     qemu_register_pc_machine(&pc_i440fx_machine_v2_3);
     qemu_register_pc_machine(&pc_i440fx_machine_v2_2);
     qemu_register_pc_machine(&pc_i440fx_machine_v2_1);
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index dcc17c0..8ef9e27 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -289,6 +289,10 @@ static void pc_q35_init(MachineState *machine)
     }
 }
 
+static void pc_compat_2_3(MachineState *machine)
+{
+}
+
 static void pc_compat_2_2(MachineState *machine)
 {
     rsdp_in_ram = false;
@@ -361,6 +365,12 @@ static void pc_compat_1_4(MachineState *machine)
     x86_cpu_compat_set_features("Westmere", FEAT_1_ECX, 0, CPUID_EXT_PCLMULQDQ);
 }
 
+static void pc_q35_init_2_3(MachineState *machine)
+{
+    pc_compat_2_3(machine);
+    pc_q35_init(machine);
+}
+
 static void pc_q35_init_2_2(MachineState *machine)
 {
     pc_compat_2_2(machine);
@@ -410,16 +420,28 @@ static void pc_q35_init_1_4(MachineState *machine)
     .hot_add_cpu = pc_hot_add_cpu, \
     .units_per_default_bus = 1
 
-#define PC_Q35_2_3_MACHINE_OPTIONS                      \
+#define PC_Q35_2_4_MACHINE_OPTIONS                      \
     PC_Q35_MACHINE_OPTIONS,                             \
     .default_machine_opts = "firmware=bios-256k.bin",   \
     .default_display = "std"
 
+static QEMUMachine pc_q35_machine_v2_4 = {
+    PC_Q35_2_4_MACHINE_OPTIONS,
+    .name = "pc-q35-2.4",
+    .alias = "q35",
+    .init = pc_q35_init,
+};
+
+#define PC_Q35_2_3_MACHINE_OPTIONS PC_Q35_2_4_MACHINE_OPTIONS
+
 static QEMUMachine pc_q35_machine_v2_3 = {
     PC_Q35_2_3_MACHINE_OPTIONS,
     .name = "pc-q35-2.3",
-    .alias = "q35",
-    .init = pc_q35_init,
+    .init = pc_q35_init_2_3,
+    .compat_props = (GlobalProperty[]) {
+        PC_COMPAT_2_3,
+        { /* end of list */ }
+    },
 };
 
 #define PC_Q35_2_2_MACHINE_OPTIONS PC_Q35_2_3_MACHINE_OPTIONS
@@ -428,6 +450,10 @@ static QEMUMachine pc_q35_machine_v2_2 = {
     PC_Q35_2_2_MACHINE_OPTIONS,
     .name = "pc-q35-2.2",
     .init = pc_q35_init_2_2,
+    .compat_props = (GlobalProperty[]) {
+        PC_COMPAT_2_3,
+        { /* end of list */ }
+    },
 };
 
 #define PC_Q35_2_1_MACHINE_OPTIONS                      \
@@ -440,6 +466,7 @@ static QEMUMachine pc_q35_machine_v2_1 = {
     .init = pc_q35_init_2_1,
     .compat_props = (GlobalProperty[]) {
         HW_COMPAT_2_1,
+        PC_COMPAT_2_3,
         { /* end of list */ }
     },
 };
@@ -506,6 +533,7 @@ static QEMUMachine pc_q35_machine_v1_4 = {
 
 static void pc_q35_machine_init(void)
 {
+    qemu_register_pc_machine(&pc_q35_machine_v2_4);
     qemu_register_pc_machine(&pc_q35_machine_v2_3);
     qemu_register_pc_machine(&pc_q35_machine_v2_2);
     qemu_register_pc_machine(&pc_q35_machine_v2_1);
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 1b35168..05ac5f9 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -295,7 +295,10 @@ int e820_add_entry(uint64_t, uint64_t, uint32_t);
 int e820_get_num_entries(void);
 bool e820_get_entry(int, uint32_t, uint64_t *, uint64_t *);
 
+#define PC_COMPAT_2_3 \
+
 #define PC_COMPAT_2_0 \
+        PC_COMPAT_2_3, \
         HW_COMPAT_2_1, \
         {\
             .driver   = "virtio-scsi-pci",\
