diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 6c16d6cfaf..4fc711b5a8 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -1252,38 +1252,8 @@ static void *spapr_build_fdt(SpaprMachineState *spapr)
     _FDT(fdt_setprop_string(fdt, 0, "model", "IBM pSeries (emulated by qemu)"));
     _FDT(fdt_setprop_string(fdt, 0, "compatible", "qemu,pseries"));
 
-    /*
-     * Add info to guest to indentify which host is it being run on
-     * and what is the uuid of the guest
-     */
-    if (spapr->host_model && !g_str_equal(spapr->host_model, "none")) {
-        if (g_str_equal(spapr->host_model, "passthrough")) {
-            /* -M host-model=passthrough */
-            if (kvmppc_get_host_model(&buf)) {
-                _FDT(fdt_setprop_string(fdt, 0, "host-model", buf));
-                g_free(buf);
-            }
-        } else {
-            /* -M host-model=<user-string> */
-            _FDT(fdt_setprop_string(fdt, 0, "host-model", spapr->host_model));
-        }
-    }
-
-    if (spapr->host_serial && !g_str_equal(spapr->host_serial, "none")) {
-        if (g_str_equal(spapr->host_serial, "passthrough")) {
-            /* -M host-serial=passthrough */
-            if (kvmppc_get_host_serial(&buf)) {
-                _FDT(fdt_setprop_string(fdt, 0, "host-serial", buf));
-                g_free(buf);
-            }
-        } else {
-            /* -M host-serial=<user-string> */
-            _FDT(fdt_setprop_string(fdt, 0, "host-serial", spapr->host_serial));
-        }
-    }
-
+    /* Guest UUID & Name*/
     buf = qemu_uuid_unparse_strdup(&qemu_uuid);
-
     _FDT(fdt_setprop_string(fdt, 0, "vm,uuid", buf));
     if (qemu_uuid_set) {
         _FDT(fdt_setprop_string(fdt, 0, "system-id", buf));
@@ -1295,6 +1265,21 @@ static void *spapr_build_fdt(SpaprMachineState *spapr)
                                 qemu_get_vm_name()));
     }
 
+    /* Host Model & Serial Number */
+    if (spapr->host_model) {
+        _FDT(fdt_setprop_string(fdt, 0, "host-model", spapr->host_model));
+    } else if (smc->broken_host_serial_model && kvmppc_get_host_model(&buf)) {
+        _FDT(fdt_setprop_string(fdt, 0, "host-model", buf));
+        g_free(buf);
+    }
+
+    if (spapr->host_serial) {
+        _FDT(fdt_setprop_string(fdt, 0, "host-serial", spapr->host_serial));
+    } else if (smc->broken_host_serial_model && kvmppc_get_host_serial(&buf)) {
+        _FDT(fdt_setprop_string(fdt, 0, "host-serial", buf));
+        g_free(buf);
+    }
+
     _FDT(fdt_setprop_cell(fdt, 0, "#address-cells", 2));
     _FDT(fdt_setprop_cell(fdt, 0, "#size-cells", 2));
 
@@ -3352,12 +3337,12 @@ static void spapr_instance_init(Object *obj)
         spapr_get_host_model, spapr_set_host_model,
         &error_abort);
     object_property_set_description(obj, "host-model",
-        "Set host's model-id to use - none|passthrough|string", &error_abort);
+        "Host model to advertise in guest device tree", &error_abort);
     object_property_add_str(obj, "host-serial",
         spapr_get_host_serial, spapr_set_host_serial,
         &error_abort);
     object_property_set_description(obj, "host-serial",
-        "Set host's system-id to use - none|passthrough|string", &error_abort);
+        "Host serial number to advertise in guest device tree", &error_abort);
 }
 
 static void spapr_machine_finalizefn(Object *obj)
@@ -4381,18 +4366,14 @@ DEFINE_SPAPR_MACHINE(4_0, "4.0", true);
 static void spapr_machine_3_1_class_options(MachineClass *mc)
 {
     SpaprMachineClass *smc = SPAPR_MACHINE_CLASS(mc);
-    static GlobalProperty compat[] = {
-        { TYPE_SPAPR_MACHINE, "host-model", "passthrough" },
-        { TYPE_SPAPR_MACHINE, "host-serial", "passthrough" },
-    };
 
     spapr_machine_4_0_class_options(mc);
     compat_props_add(mc->compat_props, hw_compat_3_1, hw_compat_3_1_len);
-    compat_props_add(mc->compat_props, compat, G_N_ELEMENTS(compat));
 
     mc->default_cpu_type = POWERPC_CPU_TYPE_NAME("power8_v2.0");
     smc->update_dt_enabled = false;
     smc->dr_phb_enabled = false;
+    smc->broken_host_serial_model = true;
     smc->default_caps.caps[SPAPR_CAP_CFPC] = SPAPR_CAP_BROKEN;
     smc->default_caps.caps[SPAPR_CAP_SBBC] = SPAPR_CAP_BROKEN;
     smc->default_caps.caps[SPAPR_CAP_IBS] = SPAPR_CAP_BROKEN;
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 2b4c05a2ec..5ea8081041 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -118,6 +118,7 @@ struct SpaprMachineClass {
     bool use_ohci_by_default;  /* use USB-OHCI instead of XHCI */
     bool pre_2_10_has_unused_icps;
     bool legacy_irq_allocation;
+    bool broken_host_serial_model; /* present real host info to the guest */
 
     void (*phb_placement)(SpaprMachineState *spapr, uint32_t index,
                           uint64_t *buid, hwaddr *pio,