diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 2a68306f2832..bb3e808b381c 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -2309,10 +2309,16 @@ static void machvirt_machine_init(void)
 }
 type_init(machvirt_machine_init);
 
+static void virt_machine_5_1_options(MachineClass *mc)
+{
+}
+DEFINE_VIRT_MACHINE_AS_LATEST(5, 1)
+
 static void virt_machine_5_0_options(MachineClass *mc)
 {
+    virt_machine_5_1_options(mc);
 }
-DEFINE_VIRT_MACHINE_AS_LATEST(5, 0)
+DEFINE_VIRT_MACHINE(5, 0)
 
 static void virt_machine_4_2_options(MachineClass *mc)
 {
diff --git a/hw/core/machine.c b/hw/core/machine.c
index c1a444cb7558..7a50dd518f4c 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -28,6 +28,9 @@
 #include "hw/mem/nvdimm.h"
 #include "migration/vmstate.h"
 
+GlobalProperty hw_compat_5_0[] = {};
+const size_t hw_compat_5_0_len = G_N_ELEMENTS(hw_compat_5_0);
+
 GlobalProperty hw_compat_4_2[] = {
     { "virtio-blk-device", "queue-size", "128"},
     { "virtio-scsi-device", "virtqueue_size", "128"},
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 5143c516531e..13e1d18cd758 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -94,6 +94,9 @@
 #include "fw_cfg.h"
 #include "trace.h"
 
+GlobalProperty pc_compat_5_0[] = {};
+const size_t pc_compat_5_0_len = G_N_ELEMENTS(pc_compat_5_0);
+
 GlobalProperty pc_compat_4_2[] = {
     { "mch", "smbase-smram", "off" },
 };
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 22dee0e76c62..921caa502b85 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -419,7 +419,7 @@ static void pc_i440fx_machine_options(MachineClass *m)
     machine_class_allow_dynamic_sysbus_dev(m, TYPE_RAMFB_DEVICE);
 }
 
-static void pc_i440fx_5_0_machine_options(MachineClass *m)
+static void pc_i440fx_5_1_machine_options(MachineClass *m)
 {
     PCMachineClass *pcmc = PC_MACHINE_CLASS(m);
     pc_i440fx_machine_options(m);
@@ -428,6 +428,18 @@ static void pc_i440fx_5_0_machine_options(MachineClass *m)
     pcmc->default_cpu_version = 1;
 }
 
+DEFINE_I440FX_MACHINE(v5_1, "pc-i440fx-5.1", NULL,
+                      pc_i440fx_5_1_machine_options);
+
+static void pc_i440fx_5_0_machine_options(MachineClass *m)
+{
+    pc_i440fx_5_1_machine_options(m);
+    m->alias = NULL;
+    m->is_default = false;
+    compat_props_add(m->compat_props, hw_compat_5_0, hw_compat_5_0_len);
+    compat_props_add(m->compat_props, pc_compat_5_0, pc_compat_5_0_len);
+}
+
 DEFINE_I440FX_MACHINE(v5_0, "pc-i440fx-5.0", NULL,
                       pc_i440fx_5_0_machine_options);
 
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index d37c425e2236..253688a9b8f3 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -349,7 +349,7 @@ static void pc_q35_machine_options(MachineClass *m)
     m->max_cpus = 288;
 }
 
-static void pc_q35_5_0_machine_options(MachineClass *m)
+static void pc_q35_5_1_machine_options(MachineClass *m)
 {
     PCMachineClass *pcmc = PC_MACHINE_CLASS(m);
     pc_q35_machine_options(m);
@@ -357,6 +357,17 @@ static void pc_q35_5_0_machine_options(MachineClass *m)
     pcmc->default_cpu_version = 1;
 }
 
+DEFINE_Q35_MACHINE(v5_1, "pc-q35-5.1", NULL,
+                   pc_q35_5_1_machine_options);
+
+static void pc_q35_5_0_machine_options(MachineClass *m)
+{
+    pc_q35_5_1_machine_options(m);
+    m->alias = NULL;
+    compat_props_add(m->compat_props, hw_compat_5_0, hw_compat_5_0_len);
+    compat_props_add(m->compat_props, pc_compat_5_0, pc_compat_5_0_len);
+}
+
 DEFINE_Q35_MACHINE(v5_0, "pc-q35-5.0", NULL,
                    pc_q35_5_0_machine_options);
 
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 9a2bd501aa6e..fd5bfd11a84c 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -4599,15 +4599,26 @@ static void spapr_machine_latest_class_options(MachineClass *mc)
     }                                                                \
     type_init(spapr_machine_register_##suffix)
 
+/*
+ * pseries-5.1
+ */
+static void spapr_machine_5_1_class_options(MachineClass *mc)
+{
+    /* Defaults for the latest behaviour inherited from the base class */
+}
+
+DEFINE_SPAPR_MACHINE(5_1, "5.1", true);
+
 /*
  * pseries-5.0
  */
 static void spapr_machine_5_0_class_options(MachineClass *mc)
 {
-    /* Defaults for the latest behaviour inherited from the base class */
+    spapr_machine_5_1_class_options(mc);
+    compat_props_add(mc->compat_props, hw_compat_5_0, hw_compat_5_0_len);
 }
 
-DEFINE_SPAPR_MACHINE(5_0, "5.0", true);
+DEFINE_SPAPR_MACHINE(5_0, "5.0", false);
 
 /*
  * pseries-4.2
diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index 0fa00a9fff3d..967a6de9683b 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -672,14 +672,26 @@ bool css_migration_enabled(void)
     }                                                                         \
     type_init(ccw_machine_register_##suffix)
 
+static void ccw_machine_5_1_instance_options(MachineState *machine)
+{
+}
+
+static void ccw_machine_5_1_class_options(MachineClass *mc)
+{
+}
+DEFINE_CCW_MACHINE(5_1, "5.1", true);
+
 static void ccw_machine_5_0_instance_options(MachineState *machine)
 {
+    ccw_machine_5_1_instance_options(machine);
 }
 
 static void ccw_machine_5_0_class_options(MachineClass *mc)
 {
+    ccw_machine_5_1_class_options(mc);
+    compat_props_add(mc->compat_props, hw_compat_5_0, hw_compat_5_0_len);
 }
-DEFINE_CCW_MACHINE(5_0, "5.0", true);
+DEFINE_CCW_MACHINE(5_0, "5.0", false);
 
 static void ccw_machine_4_2_instance_options(MachineState *machine)
 {
diff --git a/include/hw/boards.h b/include/hw/boards.h
index fd4d62b5010f..18815d9be24f 100644
--- a/include/hw/boards.h
+++ b/include/hw/boards.h
@@ -318,6 +318,9 @@ struct MachineState {
     } \
     type_init(machine_initfn##_register_types)
 
+extern GlobalProperty hw_compat_5_0[];
+extern const size_t hw_compat_5_0_len;
+
 extern GlobalProperty hw_compat_4_2[];
 extern const size_t hw_compat_4_2_len;
 
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 6ab6eda046fd..15b9294dac38 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -204,6 +204,9 @@ void pc_system_firmware_init(PCMachineState *pcms, MemoryRegion *rom_memory);
 void pc_madt_cpu_entry(AcpiDeviceIf *adev, int uid,
                        const CPUArchIdList *apic_ids, GArray *entry);
 
+extern GlobalProperty pc_compat_5_0[];
+extern const size_t pc_compat_5_0_len;
+
 extern GlobalProperty pc_compat_4_2[];
 extern const size_t pc_compat_4_2_len;
 
