cpus: Have cpu_exec_initfn() per user / system emulation

Slighly simplify cpu-target.c again by extracting cpu_exec_initfn()
to cpu-{system,user}.c, adding an empty stub for user emulation.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20250123234415.59850-19-philmd@linaro.org>

cpu-target.c

@@ -24,7 +24,6 @@
 #include "migration/vmstate.h"
 #ifndef CONFIG_USER_ONLY
 #include "hw/core/sysemu-cpu-ops.h"
-#include "exec/address-spaces.h"
 #endif
 #include "system/accel-ops.h"
 #include "system/cpus.h"
@@ -175,14 +174,6 @@ void cpu_exec_unrealizefn(CPUState *cpu)
     accel_cpu_common_unrealize(cpu);
 }
 
-void cpu_exec_initfn(CPUState *cpu)
-{
-#ifndef CONFIG_USER_ONLY
-    cpu->memory = get_system_memory();
-    object_ref(OBJECT(cpu->memory));
-#endif
-}
-
 char *cpu_model_from_type(const char *typename)
 {
     const char *suffix = "-" CPU_RESOLVING_TYPE;

hw/core/cpu-system.c

@@ -20,6 +20,7 @@
 
 #include "qemu/osdep.h"
 #include "qapi/error.h"
+#include "exec/address-spaces.h"
 #include "exec/memory.h"
 #include "exec/tswap.h"
 #include "hw/qdev-core.h"
@@ -187,3 +188,9 @@ void cpu_class_init_props(DeviceClass *dc)
 
     device_class_set_props(dc, cpu_system_props);
 }
+
+void cpu_exec_initfn(CPUState *cpu)
+{
+    cpu->memory = get_system_memory();
+    object_ref(OBJECT(cpu->memory));
+}

hw/core/cpu-user.c

@@ -25,3 +25,8 @@ void cpu_class_init_props(DeviceClass *dc)
 {
     device_class_set_props(dc, cpu_user_props);
 }
+
+void cpu_exec_initfn(CPUState *cpu)
+{
+    /* nothing to do */
+}