exec/cpu: Have cpu_exec_realize() return a boolean

Following the example documented since commit e3fe398 ("error:
Document Error API usage rules"), have cpu_exec_realizefn()
return a boolean indicating whether an error is set or not.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230918160257.30127-22-philmd@linaro.org>

cpu-target.c

@@ -131,13 +131,13 @@ const VMStateDescription vmstate_cpu_common = {
 };
 #endif
 
-void cpu_exec_realizefn(CPUState *cpu, Error **errp)
+bool cpu_exec_realizefn(CPUState *cpu, Error **errp)
 {
     /* cache the cpu class for the hotpath */
     cpu->cc = CPU_GET_CLASS(cpu);
 
     if (!accel_cpu_common_realize(cpu, errp)) {
-        return;
+        return false;
     }
 
     /* Wait until cpu initialization complete before exposing cpu. */
@@ -159,6 +159,8 @@ void cpu_exec_realizefn(CPUState *cpu, Error **errp)
         vmstate_register(NULL, cpu->cpu_index, cpu->cc->sysemu_ops->legacy_vmsd, cpu);
     }
 #endif /* CONFIG_USER_ONLY */
+
+    return true;
 }
 
 void cpu_exec_unrealizefn(CPUState *cpu)

include/hw/core/cpu.h

@@ -1152,7 +1152,7 @@ G_NORETURN void cpu_abort(CPUState *cpu, const char *fmt, ...)
 /* $(top_srcdir)/cpu.c */
 void cpu_class_init_props(DeviceClass *dc);
 void cpu_exec_initfn(CPUState *cpu);
-void cpu_exec_realizefn(CPUState *cpu, Error **errp);
+bool cpu_exec_realizefn(CPUState *cpu, Error **errp);
 void cpu_exec_unrealizefn(CPUState *cpu);
 void cpu_exec_reset_hold(CPUState *cpu);