diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index bf4b1cbfb8..33dfc8ea62 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -2147,11 +2147,16 @@ static void machvirt_machine_init(void)
 }
 type_init(machvirt_machine_init);
 
+static void virt_machine_5_0_options(MachineClass *mc)
+{
+}
+DEFINE_VIRT_MACHINE_AS_LATEST(5, 0)
+
 static void virt_machine_4_2_options(MachineClass *mc)
 {
     compat_props_add(mc->compat_props, hw_compat_4_2, hw_compat_4_2_len);
 }
-DEFINE_VIRT_MACHINE_AS_LATEST(4, 2)
+DEFINE_VIRT_MACHINE(4, 2)
 
 static void virt_machine_4_1_options(MachineClass *mc)
 {
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index ac08e63604..58867f987d 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -103,6 +103,9 @@
 
 struct hpet_fw_config hpet_cfg = {.count = UINT8_MAX};
 
+GlobalProperty pc_compat_4_2[] = {};
+const size_t pc_compat_4_2_len = G_N_ELEMENTS(pc_compat_4_2);
+
 GlobalProperty pc_compat_4_1[] = {};
 const size_t pc_compat_4_1_len = G_N_ELEMENTS(pc_compat_4_1);
 
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 87aced0742..ffb30c32ce 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -424,7 +424,7 @@ static void pc_i440fx_machine_options(MachineClass *m)
     machine_class_allow_dynamic_sysbus_dev(m, TYPE_RAMFB_DEVICE);
 }
 
-static void pc_i440fx_4_2_machine_options(MachineClass *m)
+static void pc_i440fx_5_0_machine_options(MachineClass *m)
 {
     PCMachineClass *pcmc = PC_MACHINE_CLASS(m);
     pc_i440fx_machine_options(m);
@@ -434,6 +434,18 @@ static void pc_i440fx_4_2_machine_options(MachineClass *m)
     compat_props_add(m->compat_props, hw_compat_4_2, hw_compat_4_2_len);
 }
 
+DEFINE_I440FX_MACHINE(v5_0, "pc-i440fx-5.0", NULL,
+                      pc_i440fx_5_0_machine_options);
+
+static void pc_i440fx_4_2_machine_options(MachineClass *m)
+{
+    pc_i440fx_5_0_machine_options(m);
+    m->alias = NULL;
+    m->is_default = 0;
+    compat_props_add(m->compat_props, hw_compat_4_2, hw_compat_4_2_len);
+    compat_props_add(m->compat_props, pc_compat_4_2, pc_compat_4_2_len);
+}
+
 DEFINE_I440FX_MACHINE(v4_2, "pc-i440fx-4.2", NULL,
                       pc_i440fx_4_2_machine_options);
 
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index 2608cd0062..7398d7baa2 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -348,7 +348,7 @@ static void pc_q35_machine_options(MachineClass *m)
     m->max_cpus = 288;
 }
 
-static void pc_q35_4_2_machine_options(MachineClass *m)
+static void pc_q35_5_0_machine_options(MachineClass *m)
 {
     PCMachineClass *pcmc = PC_MACHINE_CLASS(m);
     pc_q35_machine_options(m);
@@ -357,6 +357,17 @@ static void pc_q35_4_2_machine_options(MachineClass *m)
     compat_props_add(m->compat_props, hw_compat_4_2, hw_compat_4_2_len);
 }
 
+DEFINE_Q35_MACHINE(v5_0, "pc-q35-5.0", NULL,
+                   pc_q35_5_0_machine_options);
+
+static void pc_q35_4_2_machine_options(MachineClass *m)
+{
+    pc_q35_5_0_machine_options(m);
+    m->alias = NULL;
+    compat_props_add(m->compat_props, hw_compat_4_2, hw_compat_4_2_len);
+    compat_props_add(m->compat_props, pc_compat_4_2, pc_compat_4_2_len);
+}
+
 DEFINE_Q35_MACHINE(v4_2, "pc-q35-4.2", NULL,
                    pc_q35_4_2_machine_options);
 
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 2ca92f2148..3ae7db1563 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -4491,15 +4491,26 @@ static const TypeInfo spapr_machine_info = {
     }                                                                \
     type_init(spapr_machine_register_##suffix)
 
+/*
+ * pseries-5.0
+ */
+static void spapr_machine_5_0_class_options(MachineClass *mc)
+{
+    /* Defaults for the latest behaviour inherited from the base class */
+}
+
+DEFINE_SPAPR_MACHINE(5_0, "5.0", true);
+
 /*
  * pseries-4.2
  */
 static void spapr_machine_4_2_class_options(MachineClass *mc)
 {
+    spapr_machine_5_0_class_options(mc);
     compat_props_add(mc->compat_props, hw_compat_4_2, hw_compat_4_2_len);
 }
 
-DEFINE_SPAPR_MACHINE(4_2, "4.2", true);
+DEFINE_SPAPR_MACHINE(4_2, "4.2", false);
 
 /*
  * pseries-4.1
diff --git a/hw/s390x/event-facility.c b/hw/s390x/event-facility.c
index 66205697ae..cdcf9154c4 100644
--- a/hw/s390x/event-facility.c
+++ b/hw/s390x/event-facility.c
@@ -339,14 +339,16 @@ out:
 
 static void sclp_events_bus_realize(BusState *bus, Error **errp)
 {
+    Error *err = NULL;
     BusChild *kid;
 
     /* TODO: recursive realization has to be done in common code */
     QTAILQ_FOREACH(kid, &bus->children, sibling) {
         DeviceState *dev = kid->child;
 
-        object_property_set_bool(OBJECT(dev), true, "realized", errp);
-        if (*errp) {
+        object_property_set_bool(OBJECT(dev), true, "realized", &err);
+        if (errp) {
+            error_propagate(errp, err);
             return;
         }
     }
diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index cb5fe4c84d..e0e28139a2 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -348,6 +348,9 @@ static void s390_machine_reset(MachineState *machine)
         break;
     case S390_RESET_LOAD_NORMAL:
         CPU_FOREACH(t) {
+            if (t == cs) {
+                continue;
+            }
             run_on_cpu(t, s390_do_cpu_reset, RUN_ON_CPU_NULL);
         }
         subsystem_reset();
@@ -639,15 +642,26 @@ bool css_migration_enabled(void)
     }                                                                         \
     type_init(ccw_machine_register_##suffix)
 
+static void ccw_machine_5_0_instance_options(MachineState *machine)
+{
+}
+
+static void ccw_machine_5_0_class_options(MachineClass *mc)
+{
+}
+DEFINE_CCW_MACHINE(5_0, "5.0", true);
+
 static void ccw_machine_4_2_instance_options(MachineState *machine)
 {
+    ccw_machine_5_0_instance_options(machine);
 }
 
 static void ccw_machine_4_2_class_options(MachineClass *mc)
 {
+    ccw_machine_5_0_class_options(mc);
     compat_props_add(mc->compat_props, hw_compat_4_2, hw_compat_4_2_len);
 }
-DEFINE_CCW_MACHINE(4_2, "4.2", true);
+DEFINE_CCW_MACHINE(4_2, "4.2", false);
 
 static void ccw_machine_4_1_instance_options(MachineState *machine)
 {
diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c
index 6863f6c69f..3b5520ae75 100644
--- a/hw/vfio/ccw.c
+++ b/hw/vfio/ccw.c
@@ -102,7 +102,7 @@ again:
         if (errno == EAGAIN) {
             goto again;
         }
-        error_report("vfio-ccw: wirte I/O region failed with errno=%d", errno);
+        error_report("vfio-ccw: write I/O region failed with errno=%d", errno);
         ret = -errno;
     } else {
         ret = region->ret_code;
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 1f86eba3f9..61a998de46 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -237,6 +237,9 @@ 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_4_2[];
+extern const size_t pc_compat_4_2_len;
+
 extern GlobalProperty pc_compat_4_1[];
 extern const size_t pc_compat_4_1_len;
 
diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index 1c1a165dae..0be301a4ea 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -156,6 +156,17 @@ void qmp_guest_set_time(bool has_time, int64_t time_ns, Error **errp)
     pid_t pid;
     Error *local_err = NULL;
     struct timeval tv;
+    static const char hwclock_path[] = "/sbin/hwclock";
+    static int hwclock_available = -1;
+
+    if (hwclock_available < 0) {
+        hwclock_available = (access(hwclock_path, X_OK) == 0);
+    }
+
+    if (!hwclock_available) {
+        error_setg(errp, QERR_UNSUPPORTED);
+        return;
+    }
 
     /* If user has passed a time, validate and set it. */
     if (has_time) {
@@ -195,7 +206,7 @@ void qmp_guest_set_time(bool has_time, int64_t time_ns, Error **errp)
 
         /* Use '/sbin/hwclock -w' to set RTC from the system time,
          * or '/sbin/hwclock -s' to set the system time from RTC. */
-        execle("/sbin/hwclock", "hwclock", has_time ? "-w" : "-s",
+        execle(hwclock_path, "hwclock", has_time ? "-w" : "-s",
                NULL, environ);
         _exit(EXIT_FAILURE);
     } else if (pid < 0) {
diff --git a/target/s390x/cpu-qom.h b/target/s390x/cpu-qom.h
index b809ec8418..dbe5346ec9 100644
--- a/target/s390x/cpu-qom.h
+++ b/target/s390x/cpu-qom.h
@@ -34,6 +34,12 @@
 typedef struct S390CPUModel S390CPUModel;
 typedef struct S390CPUDef S390CPUDef;
 
+typedef enum cpu_reset_type {
+    S390_CPU_RESET_NORMAL,
+    S390_CPU_RESET_INITIAL,
+    S390_CPU_RESET_CLEAR,
+} cpu_reset_type;
+
 /**
  * S390CPUClass:
  * @parent_realize: The parent class' realize handler.
@@ -57,8 +63,7 @@ typedef struct S390CPUClass {
     DeviceRealize parent_realize;
     void (*parent_reset)(CPUState *cpu);
     void (*load_normal)(CPUState *cpu);
-    void (*cpu_reset)(CPUState *cpu);
-    void (*initial_cpu_reset)(CPUState *cpu);
+    void (*reset)(CPUState *cpu, cpu_reset_type type);
 } S390CPUClass;
 
 typedef struct S390CPU S390CPU;
diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c
index 3abe7e80fd..99ea09085a 100644
--- a/target/s390x/cpu.c
+++ b/target/s390x/cpu.c
@@ -82,53 +82,8 @@ static void s390_cpu_load_normal(CPUState *s)
 }
 #endif
 
-/* S390CPUClass::cpu_reset() */
-static void s390_cpu_reset(CPUState *s)
-{
-    S390CPU *cpu = S390_CPU(s);
-    S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
-    CPUS390XState *env = &cpu->env;
-
-    env->pfault_token = -1UL;
-    env->bpbc = false;
-    scc->parent_reset(s);
-    cpu->env.sigp_order = 0;
-    s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
-}
-
-/* S390CPUClass::initial_reset() */
-static void s390_cpu_initial_reset(CPUState *s)
-{
-    S390CPU *cpu = S390_CPU(s);
-    CPUS390XState *env = &cpu->env;
-
-    s390_cpu_reset(s);
-    /* initial reset does not clear everything! */
-    memset(&env->start_initial_reset_fields, 0,
-        offsetof(CPUS390XState, end_reset_fields) -
-        offsetof(CPUS390XState, start_initial_reset_fields));
-
-    /* architectured initial values for CR 0 and 14 */
-    env->cregs[0] = CR0_RESET;
-    env->cregs[14] = CR14_RESET;
-
-    /* architectured initial value for Breaking-Event-Address register */
-    env->gbea = 1;
-
-    env->pfault_token = -1UL;
-
-    /* tininess for underflow is detected before rounding */
-    set_float_detect_tininess(float_tininess_before_rounding,
-                              &env->fpu_status);
-
-    /* Reset state inside the kernel that we cannot access yet from QEMU. */
-    if (kvm_enabled()) {
-        kvm_s390_reset_vcpu(cpu);
-    }
-}
-
-/* CPUClass:reset() */
-static void s390_cpu_full_reset(CPUState *s)
+/* S390CPUClass::reset() */
+static void s390_cpu_reset(CPUState *s, cpu_reset_type type)
 {
     S390CPU *cpu = S390_CPU(s);
     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
@@ -138,31 +93,50 @@ static void s390_cpu_full_reset(CPUState *s)
     cpu->env.sigp_order = 0;
     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 
-    memset(env, 0, offsetof(CPUS390XState, end_reset_fields));
+    switch (type) {
+    case S390_CPU_RESET_CLEAR:
+        memset(env, 0, offsetof(CPUS390XState, start_initial_reset_fields));
+        /* fall through */
+    case S390_CPU_RESET_INITIAL:
+        /* initial reset does not clear everything! */
+        memset(&env->start_initial_reset_fields, 0,
+               offsetof(CPUS390XState, start_normal_reset_fields) -
+               offsetof(CPUS390XState, start_initial_reset_fields));
 
-    /* architectured initial values for CR 0 and 14 */
-    env->cregs[0] = CR0_RESET;
-    env->cregs[14] = CR14_RESET;
+        /* architectured initial value for Breaking-Event-Address register */
+        env->gbea = 1;
+
+        /* architectured initial values for CR 0 and 14 */
+        env->cregs[0] = CR0_RESET;
+        env->cregs[14] = CR14_RESET;
 
 #if defined(CONFIG_USER_ONLY)
-    /* user mode should always be allowed to use the full FPU */
-    env->cregs[0] |= CR0_AFP;
-    if (s390_has_feat(S390_FEAT_VECTOR)) {
-        env->cregs[0] |= CR0_VECTOR;
-    }
+        /* user mode should always be allowed to use the full FPU */
+        env->cregs[0] |= CR0_AFP;
+        if (s390_has_feat(S390_FEAT_VECTOR)) {
+            env->cregs[0] |= CR0_VECTOR;
+        }
 #endif
 
-    /* architectured initial value for Breaking-Event-Address register */
-    env->gbea = 1;
+        /* tininess for underflow is detected before rounding */
+        set_float_detect_tininess(float_tininess_before_rounding,
+                                  &env->fpu_status);
+       /* fall through */
+    case S390_CPU_RESET_NORMAL:
+        env->psw.mask &= ~PSW_MASK_RI;
+        memset(&env->start_normal_reset_fields, 0,
+               offsetof(CPUS390XState, end_reset_fields) -
+               offsetof(CPUS390XState, start_normal_reset_fields));
 
-    env->pfault_token = -1UL;
-
-    /* tininess for underflow is detected before rounding */
-    set_float_detect_tininess(float_tininess_before_rounding,
-                              &env->fpu_status);
+        env->pfault_token = -1UL;
+        env->bpbc = false;
+        break;
+    default:
+        g_assert_not_reached();
+    }
 
     /* Reset state inside the kernel that we cannot access yet from QEMU. */
-    if (kvm_enabled()) {
+    if (kvm_enabled() && type != S390_CPU_RESET_NORMAL) {
         kvm_s390_reset_vcpu(cpu);
     }
 }
@@ -458,6 +432,11 @@ static Property s390x_cpu_properties[] = {
     DEFINE_PROP_END_OF_LIST()
 };
 
+static void s390_cpu_reset_full(CPUState *s)
+{
+    return s390_cpu_reset(s, S390_CPU_RESET_CLEAR);
+}
+
 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 {
     S390CPUClass *scc = S390_CPU_CLASS(oc);
@@ -473,9 +452,8 @@ static void s390_cpu_class_init(ObjectClass *oc, void *data)
 #if !defined(CONFIG_USER_ONLY)
     scc->load_normal = s390_cpu_load_normal;
 #endif
-    scc->cpu_reset = s390_cpu_reset;
-    scc->initial_cpu_reset = s390_cpu_initial_reset;
-    cc->reset = s390_cpu_full_reset;
+    scc->reset = s390_cpu_reset;
+    cc->reset = s390_cpu_reset_full;
     cc->class_by_name = s390_cpu_class_by_name,
     cc->has_work = s390_cpu_has_work;
 #ifdef CONFIG_TCG
diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h
index 17460ed7b3..aa829e954c 100644
--- a/target/s390x/cpu.h
+++ b/target/s390x/cpu.h
@@ -58,7 +58,6 @@ struct CPUS390XState {
      */
     uint64_t vregs[32][2] QEMU_ALIGNED(16);  /* vector registers */
     uint32_t aregs[16];    /* access registers */
-    uint8_t riccb[64];     /* runtime instrumentation control */
     uint64_t gscb[4];      /* guarded storage control */
     uint64_t etoken;       /* etoken */
     uint64_t etoken_extension; /* etoken extension */
@@ -99,10 +98,6 @@ struct CPUS390XState {
 
     uint64_t cregs[16]; /* control registers */
 
-    int pending_int;
-    uint16_t external_call_addr;
-    DECLARE_BITMAP(emergency_signals, S390_MAX_CPUS);
-
     uint64_t ckc;
     uint64_t cputm;
     uint32_t todpr;
@@ -114,6 +109,14 @@ struct CPUS390XState {
     uint64_t gbea;
     uint64_t pp;
 
+    /* Fields up to this point are not cleared by normal CPU reset */
+    struct {} start_normal_reset_fields;
+    uint8_t riccb[64];     /* runtime instrumentation control */
+
+    int pending_int;
+    uint16_t external_call_addr;
+    DECLARE_BITMAP(emergency_signals, S390_MAX_CPUS);
+
     /* Fields up to this point are cleared by a CPU reset */
     struct {} end_reset_fields;
 
@@ -252,6 +255,7 @@ extern const VMStateDescription vmstate_s390_cpu;
 #undef PSW_SHIFT_ASC
 #undef PSW_MASK_CC
 #undef PSW_MASK_PM
+#undef PSW_MASK_RI
 #undef PSW_SHIFT_MASK_PM
 #undef PSW_MASK_64
 #undef PSW_MASK_32
@@ -273,6 +277,7 @@ extern const VMStateDescription vmstate_s390_cpu;
 #define PSW_MASK_CC             0x0000300000000000ULL
 #define PSW_MASK_PM             0x00000F0000000000ULL
 #define PSW_SHIFT_MASK_PM       40
+#define PSW_MASK_RI             0x0000008000000000ULL
 #define PSW_MASK_64             0x0000000100000000ULL
 #define PSW_MASK_32             0x0000000080000000ULL
 #define PSW_MASK_ESA_ADDR       0x000000007fffffffULL
@@ -741,14 +746,14 @@ static inline void s390_do_cpu_reset(CPUState *cs, run_on_cpu_data arg)
 {
     S390CPUClass *scc = S390_CPU_GET_CLASS(cs);
 
-    scc->cpu_reset(cs);
+    scc->reset(cs, S390_CPU_RESET_NORMAL);
 }
 
 static inline void s390_do_cpu_initial_reset(CPUState *cs, run_on_cpu_data arg)
 {
     S390CPUClass *scc = S390_CPU_GET_CLASS(cs);
 
-    scc->initial_cpu_reset(cs);
+    scc->reset(cs, S390_CPU_RESET_INITIAL);
 }
 
 static inline void s390_do_cpu_load_normal(CPUState *cs, run_on_cpu_data arg)
diff --git a/target/s390x/cpu_models.c b/target/s390x/cpu_models.c
index 7e92fb2e15..547bab8ac3 100644
--- a/target/s390x/cpu_models.c
+++ b/target/s390x/cpu_models.c
@@ -462,11 +462,7 @@ CpuDefinitionInfoList *qmp_query_cpu_definitions(Error **errp)
         .list = NULL,
     };
 
-    list_data.model = get_max_cpu_model(errp);
-    if (*errp) {
-        error_free(*errp);
-        *errp = NULL;
-    }
+    list_data.model = get_max_cpu_model(NULL);
 
     object_class_foreach(create_cpu_model_list, TYPE_S390_CPU, false,
                          &list_data);
@@ -477,6 +473,7 @@ CpuDefinitionInfoList *qmp_query_cpu_definitions(Error **errp)
 static void cpu_model_from_info(S390CPUModel *model, const CpuModelInfo *info,
                                 Error **errp)
 {
+    Error *err = NULL;
     const QDict *qdict = NULL;
     const QDictEntry *e;
     Visitor *visitor;
@@ -513,24 +510,26 @@ static void cpu_model_from_info(S390CPUModel *model, const CpuModelInfo *info,
 
     if (qdict) {
         visitor = qobject_input_visitor_new(info->props);
-        visit_start_struct(visitor, NULL, NULL, 0, errp);
-        if (*errp) {
+        visit_start_struct(visitor, NULL, NULL, 0, &err);
+        if (err) {
+            error_propagate(errp, err);
             visit_free(visitor);
             object_unref(obj);
             return;
         }
         for (e = qdict_first(qdict); e; e = qdict_next(qdict, e)) {
-            object_property_set(obj, visitor, e->key, errp);
-            if (*errp) {
+            object_property_set(obj, visitor, e->key, &err);
+            if (err) {
                 break;
             }
         }
-        if (!*errp) {
+        if (!err) {
             visit_check_struct(visitor, errp);
         }
         visit_end_struct(visitor, NULL);
         visit_free(visitor);
-        if (*errp) {
+        if (err) {
+            error_propagate(errp, err);
             object_unref(obj);
             return;
         }
@@ -595,13 +594,15 @@ CpuModelExpansionInfo *qmp_query_cpu_model_expansion(CpuModelExpansionType type,
                                                       CpuModelInfo *model,
                                                       Error **errp)
 {
+    Error *err = NULL;
     CpuModelExpansionInfo *expansion_info = NULL;
     S390CPUModel s390_model;
     bool delta_changes = false;
 
     /* convert it to our internal representation */
-    cpu_model_from_info(&s390_model, model, errp);
-    if (*errp) {
+    cpu_model_from_info(&s390_model, model, &err);
+    if (err) {
+        error_propagate(errp, err);
         return NULL;
     }
 
@@ -634,18 +635,21 @@ CpuModelCompareInfo *qmp_query_cpu_model_comparison(CpuModelInfo *infoa,
                                                      CpuModelInfo *infob,
                                                      Error **errp)
 {
+    Error *err = NULL;
     CpuModelCompareResult feat_result, gen_result;
     CpuModelCompareInfo *compare_info;
     S390FeatBitmap missing, added;
     S390CPUModel modela, modelb;
 
     /* convert both models to our internal representation */
-    cpu_model_from_info(&modela, infoa, errp);
-    if (*errp) {
+    cpu_model_from_info(&modela, infoa, &err);
+    if (err) {
+        error_propagate(errp, err);
         return NULL;
     }
-    cpu_model_from_info(&modelb, infob, errp);
-    if (*errp) {
+    cpu_model_from_info(&modelb, infob, &err);
+    if (err) {
+        error_propagate(errp, err);
         return NULL;
     }
     compare_info = g_new0(CpuModelCompareInfo, 1);
@@ -707,6 +711,7 @@ CpuModelBaselineInfo *qmp_query_cpu_model_baseline(CpuModelInfo *infoa,
                                                     CpuModelInfo *infob,
                                                     Error **errp)
 {
+    Error *err = NULL;
     CpuModelBaselineInfo *baseline_info;
     S390CPUModel modela, modelb, model;
     uint16_t cpu_type;
@@ -714,13 +719,15 @@ CpuModelBaselineInfo *qmp_query_cpu_model_baseline(CpuModelInfo *infoa,
     uint8_t max_gen;
 
     /* convert both models to our internal representation */
-    cpu_model_from_info(&modela, infoa, errp);
-    if (*errp) {
+    cpu_model_from_info(&modela, infoa, &err);
+    if (err) {
+        error_propagate(errp, err);
         return NULL;
     }
 
-    cpu_model_from_info(&modelb, infob, errp);
-    if (*errp) {
+    cpu_model_from_info(&modelb, infob, &err);
+    if (err) {
+        error_propagate(errp, err);
         return NULL;
     }
 
@@ -870,6 +877,7 @@ static void check_compatibility(const S390CPUModel *max_model,
 
 static S390CPUModel *get_max_cpu_model(Error **errp)
 {
+    Error *err = NULL;
     static S390CPUModel max_model;
     static bool cached;
 
@@ -878,22 +886,24 @@ static S390CPUModel *get_max_cpu_model(Error **errp)
     }
 
     if (kvm_enabled()) {
-        kvm_s390_get_host_cpu_model(&max_model, errp);
+        kvm_s390_get_host_cpu_model(&max_model, &err);
     } else {
         max_model.def = s390_find_cpu_def(QEMU_MAX_CPU_TYPE, QEMU_MAX_CPU_GEN,
                                           QEMU_MAX_CPU_EC_GA, NULL);
         bitmap_copy(max_model.features, qemu_max_cpu_feat, S390_FEAT_MAX);
-   }
-    if (!*errp) {
-        cached = true;
-        return &max_model;
     }
-    return NULL;
+    if (err) {
+        error_propagate(errp, err);
+        return NULL;
+    }
+    cached = true;
+    return &max_model;
 }
 
 static inline void apply_cpu_model(const S390CPUModel *model, Error **errp)
 {
 #ifndef CONFIG_USER_ONLY
+    Error *err = NULL;
     static S390CPUModel applied_model;
     static bool applied;
 
@@ -909,20 +919,23 @@ static inline void apply_cpu_model(const S390CPUModel *model, Error **errp)
     }
 
     if (kvm_enabled()) {
-        kvm_s390_apply_cpu_model(model, errp);
+        kvm_s390_apply_cpu_model(model, &err);
+        if (err) {
+            error_propagate(errp, err);
+            return;
+        }
     }
 
-    if (!*errp) {
-        applied = true;
-        if (model) {
-            applied_model = *model;
-        }
+    applied = true;
+    if (model) {
+        applied_model = *model;
     }
 #endif
 }
 
 void s390_realize_cpu_model(CPUState *cs, Error **errp)
 {
+    Error *err = NULL;
     S390CPUClass *xcc = S390_CPU_GET_CLASS(cs);
     S390CPU *cpu = S390_CPU(cs);
     const S390CPUModel *max_model;
@@ -939,7 +952,7 @@ void s390_realize_cpu_model(CPUState *cs, Error **errp)
     }
 
     max_model = get_max_cpu_model(errp);
-    if (*errp) {
+    if (!max_model) {
         error_prepend(errp, "CPU models are not available: ");
         return;
     }
@@ -951,8 +964,9 @@ void s390_realize_cpu_model(CPUState *cs, Error **errp)
     cpu->model->cpu_ver = max_model->cpu_ver;
 
     check_consistency(cpu->model);
-    check_compatibility(max_model, cpu->model, errp);
-    if (*errp) {
+    check_compatibility(max_model, cpu->model, &err);
+    if (err) {
+        error_propagate(errp, err);
         return;
     }
 
@@ -987,6 +1001,7 @@ static void get_feature(Object *obj, Visitor *v, const char *name,
 static void set_feature(Object *obj, Visitor *v, const char *name,
                         void *opaque, Error **errp)
 {
+    Error *err = NULL;
     S390Feat feat = (S390Feat) opaque;
     DeviceState *dev = DEVICE(obj);
     S390CPU *cpu = S390_CPU(obj);
@@ -1002,8 +1017,9 @@ static void set_feature(Object *obj, Visitor *v, const char *name,
         return;
     }
 
-    visit_type_bool(v, name, &value, errp);
-    if (*errp) {
+    visit_type_bool(v, name, &value, &err);
+    if (err) {
+        error_propagate(errp, err);
         return;
     }
     if (value) {
@@ -1043,6 +1059,7 @@ static void get_feature_group(Object *obj, Visitor *v, const char *name,
 static void set_feature_group(Object *obj, Visitor *v, const char *name,
                               void *opaque, Error **errp)
 {
+    Error *err = NULL;
     S390FeatGroup group = (S390FeatGroup) opaque;
     const S390FeatGroupDef *def = s390_feat_group_def(group);
     DeviceState *dev = DEVICE(obj);
@@ -1059,8 +1076,9 @@ static void set_feature_group(Object *obj, Visitor *v, const char *name,
         return;
     }
 
-    visit_type_bool(v, name, &value, errp);
-    if (*errp) {
+    visit_type_bool(v, name, &value, &err);
+    if (err) {
+        error_propagate(errp, err);
         return;
     }
     if (value) {
diff --git a/target/s390x/diag.c b/target/s390x/diag.c
index 53c2f81f2a..b5aec06d6b 100644
--- a/target/s390x/diag.c
+++ b/target/s390x/diag.c
@@ -53,6 +53,29 @@ int handle_diag_288(CPUS390XState *env, uint64_t r1, uint64_t r3)
 #define DIAG_308_RC_NO_CONF         0x0102
 #define DIAG_308_RC_INVALID         0x0402
 
+#define DIAG308_RESET_MOD_CLR       0
+#define DIAG308_RESET_LOAD_NORM     1
+#define DIAG308_LOAD_CLEAR          3
+#define DIAG308_LOAD_NORMAL_DUMP    4
+#define DIAG308_SET                 5
+#define DIAG308_STORE               6
+
+static int diag308_parm_check(CPUS390XState *env, uint64_t r1, uint64_t addr,
+                              uintptr_t ra, bool write)
+{
+    if ((r1 & 1) || (addr & ~TARGET_PAGE_MASK)) {
+        s390_program_interrupt(env, PGM_SPECIFICATION, ra);
+        return -1;
+    }
+    if (!address_space_access_valid(&address_space_memory, addr,
+                                    sizeof(IplParameterBlock), write,
+                                    MEMTXATTRS_UNSPECIFIED)) {
+        s390_program_interrupt(env, PGM_ADDRESSING, ra);
+        return -1;
+    }
+    return 0;
+}
+
 void handle_diag_308(CPUS390XState *env, uint64_t r1, uint64_t r3, uintptr_t ra)
 {
     CPUState *cs = env_cpu(env);
@@ -65,30 +88,24 @@ void handle_diag_308(CPUS390XState *env, uint64_t r1, uint64_t r3, uintptr_t ra)
         return;
     }
 
-    if ((subcode & ~0x0ffffULL) || (subcode > 6)) {
+    if (subcode & ~0x0ffffULL) {
         s390_program_interrupt(env, PGM_SPECIFICATION, ra);
         return;
     }
 
     switch (subcode) {
-    case 0:
+    case DIAG308_RESET_MOD_CLR:
         s390_ipl_reset_request(cs, S390_RESET_MODIFIED_CLEAR);
         break;
-    case 1:
+    case DIAG308_RESET_LOAD_NORM:
         s390_ipl_reset_request(cs, S390_RESET_LOAD_NORMAL);
         break;
-    case 3:
+    case DIAG308_LOAD_CLEAR:
+        /* Well we still lack the clearing bit... */
         s390_ipl_reset_request(cs, S390_RESET_REIPL);
         break;
-    case 5:
-        if ((r1 & 1) || (addr & 0x0fffULL)) {
-            s390_program_interrupt(env, PGM_SPECIFICATION, ra);
-            return;
-        }
-        if (!address_space_access_valid(&address_space_memory, addr,
-                                        sizeof(IplParameterBlock), false,
-                                        MEMTXATTRS_UNSPECIFIED)) {
-            s390_program_interrupt(env, PGM_ADDRESSING, ra);
+    case DIAG308_SET:
+        if (diag308_parm_check(env, r1, addr, ra, false)) {
             return;
         }
         iplb = g_new0(IplParameterBlock, 1);
@@ -110,15 +127,8 @@ void handle_diag_308(CPUS390XState *env, uint64_t r1, uint64_t r3, uintptr_t ra)
 out:
         g_free(iplb);
         return;
-    case 6:
-        if ((r1 & 1) || (addr & 0x0fffULL)) {
-            s390_program_interrupt(env, PGM_SPECIFICATION, ra);
-            return;
-        }
-        if (!address_space_access_valid(&address_space_memory, addr,
-                                        sizeof(IplParameterBlock), true,
-                                        MEMTXATTRS_UNSPECIFIED)) {
-            s390_program_interrupt(env, PGM_ADDRESSING, ra);
+    case DIAG308_STORE:
+        if (diag308_parm_check(env, r1, addr, ra, true)) {
             return;
         }
         iplb = s390_ipl_get_iplb();
diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c
index 0c9d14b4b1..ad6e38c876 100644
--- a/target/s390x/kvm.c
+++ b/target/s390x/kvm.c
@@ -1159,13 +1159,13 @@ void kvm_s390_access_exception(S390CPU *cpu, uint16_t code, uint64_t te_code)
     kvm_s390_vcpu_interrupt(cpu, &irq);
 }
 
-static int kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run,
+static void kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run,
                                  uint16_t ipbh0)
 {
     CPUS390XState *env = &cpu->env;
     uint64_t sccb;
     uint32_t code;
-    int r = 0;
+    int r;
 
     sccb = env->regs[ipbh0 & 0xf];
     code = env->regs[(ipbh0 & 0xf0) >> 4];
@@ -1173,11 +1173,9 @@ static int kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run,
     r = sclp_service_call(env, sccb, code);
     if (r < 0) {
         kvm_s390_program_interrupt(cpu, -r);
-    } else {
-        setcc(cpu, r);
+        return;
     }
-
-    return 0;
+    setcc(cpu, r);
 }
 
 static int handle_b2(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
@@ -1240,7 +1238,7 @@ static int handle_b2(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
         setcc(cpu, 3);
         break;
     case PRIV_B2_SCLP_CALL:
-        rc = kvm_sclp_service_call(cpu, run, ipbh0);
+        kvm_sclp_service_call(cpu, run, ipbh0);
         break;
     default:
         rc = -1;
diff --git a/target/s390x/sigp.c b/target/s390x/sigp.c
index 2ce22d4dc1..727875bb4a 100644
--- a/target/s390x/sigp.c
+++ b/target/s390x/sigp.c
@@ -254,7 +254,7 @@ static void sigp_initial_cpu_reset(CPUState *cs, run_on_cpu_data arg)
     SigpInfo *si = arg.host_ptr;
 
     cpu_synchronize_state(cs);
-    scc->initial_cpu_reset(cs);
+    scc->reset(cs, S390_CPU_RESET_INITIAL);
     cpu_synchronize_post_reset(cs);
     si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
 }
@@ -266,7 +266,7 @@ static void sigp_cpu_reset(CPUState *cs, run_on_cpu_data arg)
     SigpInfo *si = arg.host_ptr;
 
     cpu_synchronize_state(cs);
-    scc->cpu_reset(cs);
+    scc->reset(cs, S390_CPU_RESET_NORMAL);
     cpu_synchronize_post_reset(cs);
     si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
 }