diff --git a/include/hw/nmi.h b/include/hw/nmi.h
index fff41bebc6..c70db941c9 100644
--- a/include/hw/nmi.h
+++ b/include/hw/nmi.h
@@ -37,7 +37,16 @@ typedef struct NMIState NMIState;
 struct NMIClass {
     InterfaceClass parent_class;
 
-    void (*nmi_monitor_handler)(NMIState *n, int cpu_index, Error **errp);
+    /**
+     * nmi_handler: Callback to handle NMI notifications.
+     *
+     * @n: Class #NMIState state
+     * @errp: pointer to error object
+     *
+     * On success, return %true.
+     * On failure, store an error through @errp and return %false.
+     */
+    bool (*nmi_handler)(NMIState *n, Error **errp);
 };
 
 void nmi_monitor_handle(int cpu_index, Error **errp);
diff --git a/hw/core/nmi.c b/hw/core/nmi.c
index f5220111c1..409164d445 100644
--- a/hw/core/nmi.c
+++ b/hw/core/nmi.c
@@ -40,8 +40,7 @@ static int do_nmi(Object *o, void *opaque)
         NMIClass *nc = NMI_GET_CLASS(n);
 
         ns->handled = true;
-        nc->nmi_monitor_handler(n, ns->cpu_index, &ns->err);
-        if (ns->err) {
+        if (!nc->nmi_handler(n, &ns->err)) {
             return -1;
         }
     }
diff --git a/hw/hppa/machine.c b/hw/hppa/machine.c
index 5fcaf5884b..75b61a0683 100644
--- a/hw/hppa/machine.c
+++ b/hw/hppa/machine.c
@@ -673,13 +673,15 @@ static void hppa_machine_reset(MachineState *ms, ShutdownCause reason)
     cpu[0]->env.gr[19] = FW_CFG_IO_BASE;
 }
 
-static void hppa_nmi(NMIState *n, int cpu_index, Error **errp)
+static bool hppa_nmi(NMIState *n, Error **errp)
 {
     CPUState *cs;
 
     CPU_FOREACH(cs) {
         cpu_interrupt(cs, CPU_INTERRUPT_NMI);
     }
+
+    return true;
 }
 
 static void HP_B160L_machine_init_class_init(ObjectClass *oc, void *data)
@@ -705,7 +707,7 @@ static void HP_B160L_machine_init_class_init(ObjectClass *oc, void *data)
     mc->default_ram_id = "ram";
     mc->default_nic = "tulip";
 
-    nc->nmi_monitor_handler = hppa_nmi;
+    nc->nmi_handler = hppa_nmi;
 }
 
 static const TypeInfo HP_B160L_machine_init_typeinfo = {
@@ -741,7 +743,7 @@ static void HP_C3700_machine_init_class_init(ObjectClass *oc, void *data)
     mc->default_ram_id = "ram";
     mc->default_nic = "tulip";
 
-    nc->nmi_monitor_handler = hppa_nmi;
+    nc->nmi_handler = hppa_nmi;
 }
 
 static const TypeInfo HP_C3700_machine_init_typeinfo = {
diff --git a/hw/i386/x86.c b/hw/i386/x86.c
index 684dce90e9..0d756c4857 100644
--- a/hw/i386/x86.c
+++ b/hw/i386/x86.c
@@ -512,9 +512,8 @@ const CPUArchIdList *x86_possible_cpu_arch_ids(MachineState *ms)
     return ms->possible_cpus;
 }
 
-static void x86_nmi(NMIState *n, int cpu_index, Error **errp)
+static bool x86_nmi(NMIState *n, Error **errp)
 {
-    /* cpu index isn't used */
     CPUState *cs;
 
     CPU_FOREACH(cs) {
@@ -526,6 +525,8 @@ static void x86_nmi(NMIState *n, int cpu_index, Error **errp)
             cpu_interrupt(cs, CPU_INTERRUPT_NMI);
         }
     }
+
+    return true;
 }
 
 static long get_file_size(FILE *f)
@@ -1416,7 +1417,7 @@ static void x86_machine_class_init(ObjectClass *oc, void *data)
     mc->possible_cpu_arch_ids = x86_possible_cpu_arch_ids;
     x86mc->save_tsc_khz = true;
     x86mc->fwcfg_dma_enabled = true;
-    nc->nmi_monitor_handler = x86_nmi;
+    nc->nmi_handler = x86_nmi;
 
     object_class_property_add(oc, X86_MACHINE_SMM, "OnOffAuto",
         x86_machine_get_smm, x86_machine_set_smm,
diff --git a/hw/intc/m68k_irqc.c b/hw/intc/m68k_irqc.c
index 4b11fb9f72..acc9348218 100644
--- a/hw/intc/m68k_irqc.c
+++ b/hw/intc/m68k_irqc.c
@@ -71,9 +71,11 @@ static void m68k_irqc_instance_init(Object *obj)
     qdev_init_gpio_in(DEVICE(obj), m68k_set_irq, M68K_IRQC_LEVEL_NUM);
 }
 
-static void m68k_nmi(NMIState *n, int cpu_index, Error **errp)
+static bool m68k_nmi(NMIState *n, Error **errp)
 {
     m68k_set_irq(n, M68K_IRQC_LEVEL_7, 1);
+
+    return true;
 }
 
 static const VMStateDescription vmstate_m68k_irqc = {
@@ -99,7 +101,7 @@ static void m68k_irqc_class_init(ObjectClass *oc, void *data)
     InterruptStatsProviderClass *ic = INTERRUPT_STATS_PROVIDER_CLASS(oc);
 
     device_class_set_props(dc, m68k_irqc_properties);
-    nc->nmi_monitor_handler = m68k_nmi;
+    nc->nmi_handler = m68k_nmi;
     dc->reset = m68k_irqc_reset;
     dc->vmsd = &vmstate_m68k_irqc;
     ic->get_statistics = m68k_irqc_get_statistics;
diff --git a/hw/m68k/q800-glue.c b/hw/m68k/q800-glue.c
index b5a7713863..f92bd5064a 100644
--- a/hw/m68k/q800-glue.c
+++ b/hw/m68k/q800-glue.c
@@ -159,13 +159,15 @@ static void glue_auxmode_set_irq(void *opaque, int irq, int level)
     s->auxmode = level;
 }
 
-static void glue_nmi(NMIState *n, int cpu_index, Error **errp)
+static bool glue_nmi(NMIState *n, Error **errp)
 {
     GLUEState *s = GLUE(n);
 
     /* Hold NMI active for 100ms */
     GLUE_set_irq(s, GLUE_IRQ_IN_NMI, 1);
     timer_mod(s->nmi_release, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 100);
+
+    return true;
 }
 
 static void glue_nmi_release(void *opaque)
@@ -238,7 +240,7 @@ static void glue_class_init(ObjectClass *klass, void *data)
     dc->vmsd = &vmstate_glue;
     device_class_set_props(dc, glue_properties);
     rc->phases.hold = glue_reset_hold;
-    nc->nmi_monitor_handler = glue_nmi;
+    nc->nmi_handler = glue_nmi;
 }
 
 static const TypeInfo glue_info_types[] = {
diff --git a/hw/misc/macio/gpio.c b/hw/misc/macio/gpio.c
index 549563747d..9ac93d9ed5 100644
--- a/hw/misc/macio/gpio.c
+++ b/hw/misc/macio/gpio.c
@@ -183,10 +183,12 @@ static void macio_gpio_reset(DeviceState *dev)
     macio_set_gpio(s, 1, true);
 }
 
-static void macio_gpio_nmi(NMIState *n, int cpu_index, Error **errp)
+static bool macio_gpio_nmi(NMIState *n, Error **errp)
 {
     macio_set_gpio(MACIO_GPIO(n), 9, true);
     macio_set_gpio(MACIO_GPIO(n), 9, false);
+
+    return true;
 }
 
 static void macio_gpio_class_init(ObjectClass *oc, void *data)
@@ -196,7 +198,7 @@ static void macio_gpio_class_init(ObjectClass *oc, void *data)
 
     dc->reset = macio_gpio_reset;
     dc->vmsd = &vmstate_macio_gpio;
-    nc->nmi_monitor_handler = macio_gpio_nmi;
+    nc->nmi_handler = macio_gpio_nmi;
 }
 
 static const TypeInfo macio_gpio_init_info = {
diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index 0297871bdd..f572f8d0ce 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -2321,13 +2321,15 @@ static void pnv_cpu_do_nmi_on_cpu(CPUState *cs, run_on_cpu_data arg)
     }
 }
 
-static void pnv_nmi(NMIState *n, int cpu_index, Error **errp)
+static bool pnv_nmi(NMIState *n, Error **errp)
 {
     CPUState *cs;
 
     CPU_FOREACH(cs) {
         async_run_on_cpu(cs, pnv_cpu_do_nmi_on_cpu, RUN_ON_CPU_NULL);
     }
+
+    return true;
 }
 
 static void pnv_machine_class_init(ObjectClass *oc, void *data)
@@ -2351,7 +2353,7 @@ static void pnv_machine_class_init(ObjectClass *oc, void *data)
     mc->default_ram_size = 1 * GiB;
     mc->default_ram_id = "pnv.ram";
     ispc->print_info = pnv_pic_print_info;
-    nc->nmi_monitor_handler = pnv_nmi;
+    nc->nmi_handler = pnv_nmi;
 
     object_class_property_add_bool(oc, "hb-mode",
                                    pnv_machine_get_hb, pnv_machine_set_hb);
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 0d72d286d8..7327bf3429 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -3505,13 +3505,15 @@ void spapr_do_system_reset_on_cpu(CPUState *cs, run_on_cpu_data arg)
     }
 }
 
-static void spapr_nmi(NMIState *n, int cpu_index, Error **errp)
+static bool spapr_nmi(NMIState *n, Error **errp)
 {
     CPUState *cs;
 
     CPU_FOREACH(cs) {
         async_run_on_cpu(cs, spapr_do_system_reset_on_cpu, RUN_ON_CPU_NULL);
     }
+
+    return true;
 }
 
 int spapr_lmb_dt_populate(SpaprDrc *drc, SpaprMachineState *spapr,
@@ -4672,7 +4674,7 @@ static void spapr_machine_class_init(ObjectClass *oc, void *data)
     mc->nvdimm_supported = true;
     smc->resize_hpt_default = SPAPR_RESIZE_HPT_ENABLED;
     fwc->get_dev_path = spapr_get_fw_dev_path;
-    nc->nmi_monitor_handler = spapr_nmi;
+    nc->nmi_handler = spapr_nmi;
     smc->phb_placement = spapr_phb_placement;
     vhc->cpu_in_nested = spapr_cpu_in_nested;
     vhc->deliver_hv_excp = spapr_exit_nested;
diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index ba1fa6472f..817f414767 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -603,9 +603,11 @@ static HotplugHandler *s390_get_hotplug_handler(MachineState *machine,
     return NULL;
 }
 
-static void s390_nmi(NMIState *n, int cpu_index, Error **errp)
+static bool s390_nmi(NMIState *n, Error **errp)
 {
     s390_cpu_restart(S390_CPU(first_cpu));
+
+    return true;
 }
 
 static ram_addr_t s390_fixup_ram_size(ram_addr_t sz)
@@ -774,7 +776,7 @@ static void ccw_machine_class_init(ObjectClass *oc, void *data)
     mc->default_cpu_type = S390_CPU_TYPE_NAME("qemu");
     hc->plug = s390_machine_device_plug;
     hc->unplug_request = s390_machine_device_unplug_request;
-    nc->nmi_monitor_handler = s390_nmi;
+    nc->nmi_handler = s390_nmi;
     mc->default_ram_id = "s390.ram";
     mc->default_nic = "virtio-net-ccw";
 
