[Qemu-devel] [RFC PATCH v2 1/5] cpu, target-ppc: Move cpu_vmstate_[un]register calls to cpu_common_[un]realize

[Bharata B Rao <bharata@linux.vnet.ibm.com>]

Move vmstate_register() call to cpu_common_realize().
Introduce cpu_common_unrealize() and move vmstate_unregister() to it.

Change those archs that implement their own CPU unrealize routine to
mandatorily call CPUClass::unrealize().

TODO: Decide if we indeed  want to move vmstate_[un]register()
calls to cpu_common_[un]realize().

Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
---
 exec.c                      | 53 ++++++++++++++++++++++++++++-----------------
 include/qom/cpu.h           |  2 ++
 qom/cpu.c                   |  7 ++++++
 target-ppc/cpu-qom.h        |  2 ++
 target-ppc/translate_init.c |  3 +++
 5 files changed, 47 insertions(+), 20 deletions(-)

diff --git a/exec.c b/exec.c
index 0122ef7..fb73910 100644
--- a/exec.c
+++ b/exec.c
@@ -594,9 +594,7 @@ AddressSpace *cpu_get_address_space(CPUState *cpu, int asidx)
     /* Return the AddressSpace corresponding to the specified index */
     return cpu->cpu_ases[asidx].as;
 }
-#endif
 
-#ifndef CONFIG_USER_ONLY
 static DECLARE_BITMAP(cpu_index_map, MAX_CPUMASK_BITS);
 
 static int cpu_get_free_index(Error **errp)
@@ -617,6 +615,31 @@ static void cpu_release_index(CPUState *cpu)
 {
     bitmap_clear(cpu_index_map, cpu->cpu_index, 1);
 }
+
+void cpu_vmstate_register(CPUState *cpu)
+{
+    CPUClass *cc = CPU_GET_CLASS(cpu);
+
+    if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
+        vmstate_register(NULL, cpu->cpu_index, &vmstate_cpu_common, cpu);
+    }
+    if (cc->vmsd != NULL) {
+        vmstate_register(NULL, cpu->cpu_index, cc->vmsd, cpu);
+    }
+}
+
+void cpu_vmstate_unregister(CPUState *cpu)
+{
+    CPUClass *cc = CPU_GET_CLASS(cpu);
+
+    if (cc->vmsd != NULL) {
+        vmstate_unregister(NULL, cc->vmsd, cpu);
+    }
+    if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
+        vmstate_unregister(NULL, &vmstate_cpu_common, cpu);
+    }
+}
+
 #else
 
 static int cpu_get_free_index(Error **errp)
@@ -634,12 +657,18 @@ static void cpu_release_index(CPUState *cpu)
 {
     return;
 }
+
+void cpu_vmstate_register(CPUState *cpu)
+{
+}
+
+void cpu_vmstate_unregister(CPUState *cpu)
+{
+}
 #endif
 
 void cpu_exec_exit(CPUState *cpu)
 {
-    CPUClass *cc = CPU_GET_CLASS(cpu);
-
 #if defined(CONFIG_USER_ONLY)
     cpu_list_lock();
 #endif
@@ -657,18 +686,10 @@ void cpu_exec_exit(CPUState *cpu)
 #if defined(CONFIG_USER_ONLY)
     cpu_list_unlock();
 #endif
-
-    if (cc->vmsd != NULL) {
-        vmstate_unregister(NULL, cc->vmsd, cpu);
-    }
-    if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
-        vmstate_unregister(NULL, &vmstate_cpu_common, cpu);
-    }
 }
 
 void cpu_exec_init(CPUState *cpu, Error **errp)
 {
-    CPUClass *cc = CPU_GET_CLASS(cpu);
     Error *local_err = NULL;
 
     cpu->as = NULL;
@@ -705,15 +726,7 @@ void cpu_exec_init(CPUState *cpu, Error **errp)
     }
     QTAILQ_INSERT_TAIL(&cpus, cpu, node);
 #if defined(CONFIG_USER_ONLY)
-    (void) cc;
     cpu_list_unlock();
-#else
-    if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
-        vmstate_register(NULL, cpu->cpu_index, &vmstate_cpu_common, cpu);
-    }
-    if (cc->vmsd != NULL) {
-        vmstate_register(NULL, cpu->cpu_index, cc->vmsd, cpu);
-    }
 #endif
 }
 
diff --git a/include/qom/cpu.h b/include/qom/cpu.h
index cacb100..331386f 100644
--- a/include/qom/cpu.h
+++ b/include/qom/cpu.h
@@ -870,4 +870,6 @@ extern const struct VMStateDescription vmstate_cpu_common;
     .offset = 0,                                                            \
 }
 
+void cpu_vmstate_register(CPUState *cpu);
+void cpu_vmstate_unregister(CPUState *cpu);
 #endif
diff --git a/qom/cpu.c b/qom/cpu.c
index a9727a1..1095ea1 100644
--- a/qom/cpu.c
+++ b/qom/cpu.c
@@ -325,10 +325,16 @@ static void cpu_common_parse_features(const char *typename, char *features,
     }
 }
 
+static void cpu_common_unrealizefn(DeviceState *dev, Error **errp)
+{
+    cpu_vmstate_unregister(CPU(dev));
+}
+
 static void cpu_common_realizefn(DeviceState *dev, Error **errp)
 {
     CPUState *cpu = CPU(dev);
 
+    cpu_vmstate_register(cpu);
     if (dev->hotplugged) {
         cpu_synchronize_post_init(cpu);
         cpu_resume(cpu);
@@ -382,6 +388,7 @@ static void cpu_class_init(ObjectClass *klass, void *data)
     k->cpu_exec_exit = cpu_common_noop;
     k->cpu_exec_interrupt = cpu_common_exec_interrupt;
     dc->realize = cpu_common_realizefn;
+    dc->unrealize = cpu_common_unrealizefn;
     /*
      * Reason: CPUs still need special care by board code: wiring up
      * IRQs, adding reset handlers, halting non-first CPUs, ...
diff --git a/target-ppc/cpu-qom.h b/target-ppc/cpu-qom.h
index 2864105..6ec2fca 100644
--- a/target-ppc/cpu-qom.h
+++ b/target-ppc/cpu-qom.h
@@ -163,6 +163,7 @@ struct ppc_segment_page_sizes;
 /**
  * PowerPCCPUClass:
  * @parent_realize: The parent class' realize handler.
+ * @parent_unrealize: The parent class' unrealize handler.
  * @parent_reset: The parent class' reset handler.
  *
  * A PowerPC CPU model.
@@ -173,6 +174,7 @@ typedef struct PowerPCCPUClass {
     /*< public >*/
 
     DeviceRealize parent_realize;
+    DeviceUnrealize parent_unrealize;
     void (*parent_reset)(CPUState *cpu);
 
     uint32_t pvr;
diff --git a/target-ppc/translate_init.c b/target-ppc/translate_init.c
index 976a38b..bc8b767 100644
--- a/target-ppc/translate_init.c
+++ b/target-ppc/translate_init.c
@@ -9743,10 +9743,12 @@ static void ppc_cpu_realizefn(DeviceState *dev, Error **errp)
 static void ppc_cpu_unrealizefn(DeviceState *dev, Error **errp)
 {
     PowerPCCPU *cpu = POWERPC_CPU(dev);
+    PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
     CPUPPCState *env = &cpu->env;
     opc_handler_t **table;
     int i, j;
 
+    pcc->parent_unrealize(dev, errp);
     cpu_exec_exit(CPU(dev));
 
     for (i = 0; i < PPC_CPU_OPCODES_LEN; i++) {
@@ -10329,6 +10331,7 @@ static void ppc_cpu_class_init(ObjectClass *oc, void *data)
     DeviceClass *dc = DEVICE_CLASS(oc);
 
     pcc->parent_realize = dc->realize;
+    pcc->parent_unrealize = dc->unrealize;
     pcc->pvr_match = ppc_pvr_match_default;
     pcc->interrupts_big_endian = ppc_cpu_interrupts_big_endian_always;
     dc->realize = ppc_cpu_realizefn;
-- 
2.7.4