target-microblaze: Mark as unmigratable

cpu_{save,load} were no-ops, so de facto it is unmigratable and no
backwards compatibility to keep. Therefore mark the MicroBlazeCPU as
unmigratable at device level the QOM way and suppress "cpu_common"
VMState registration by dropping CPU_SAVE_VERSION.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
Reviewed-by: Juan Quintela <quintela@redhat.com>

target-microblaze/Makefile.objs

 obj-y += translate.o op_helper.o helper.o cpu.o
-obj-$(CONFIG_SOFTMMU) += mmu.o machine.o
+obj-$(CONFIG_SOFTMMU) += mmu.o

target-microblaze/cpu.c

@@ -22,6 +22,7 @@
 
 #include "cpu.h"
 #include "qemu-common.h"
+#include "migration/vmstate.h"
 
 
 /* CPUClass::reset() */
@@ -94,13 +95,21 @@ static void mb_cpu_initfn(Object *obj)
     set_float_rounding_mode(float_round_nearest_even, &env->fp_status);
 }
 
+static const VMStateDescription vmstate_mb_cpu = {
+    .name = "cpu",
+    .unmigratable = 1,
+};
+
 static void mb_cpu_class_init(ObjectClass *oc, void *data)
 {
+    DeviceClass *dc = DEVICE_CLASS(oc);
     CPUClass *cc = CPU_CLASS(oc);
     MicroBlazeCPUClass *mcc = MICROBLAZE_CPU_CLASS(oc);
 
     mcc->parent_reset = cc->reset;
     cc->reset = mb_cpu_reset;
+
+    dc->vmsd = &vmstate_mb_cpu;
 }
 
 static const TypeInfo mb_cpu_type_info = {

target-microblaze/cpu.h

@@ -307,8 +307,6 @@ static inline CPUMBState *cpu_init(const char *cpu_model)
 #define cpu_gen_code cpu_mb_gen_code
 #define cpu_signal_handler cpu_mb_signal_handler
 
-#define CPU_SAVE_VERSION 1
-
 /* MMU modes definitions */
 #define MMU_MODE0_SUFFIX _nommu
 #define MMU_MODE1_SUFFIX _kernel

target-microblaze/machine.c

-#include "hw/hw.h"
-#include "hw/boards.h"
-
-void cpu_save(QEMUFile *f, void *opaque)
-{
-}
-
-int cpu_load(QEMUFile *f, void *opaque, int version_id)
-{
-    return 0;
-}