[Qemu-devel] [RFC V2 02/10] qom/cpu: move register_vmstate to common CPUClass.realizefn

[Gu Zheng <guz.fnst@cn.fujitsu.com>]

Move cpu vmstate register from cpu_exec_init into cpu_common_realizefn,
apic vmstate register into x86_cpu_apic_realize. And use the
cc->get_arch_id as the instance id that suggested by Igor to
fix the migration issue.
Besides, also use cc->get_arch_id as the cpu index of HMP/QMP command output to
fix the index duplicated issue when hotadd a hot-removed cpu.

v2:
 -fix the cpu index duplicated issue in the QMP/HMP command output.

Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
---
 cpus.c                          |    4 +++-
 exec.c                          |   32 +++++++++++++++++++-------------
 hw/intc/apic_common.c           |    3 +--
 include/hw/i386/apic_internal.h |    2 ++
 include/qom/cpu.h               |    2 ++
 monitor.c                       |    4 +++-
 qom/cpu.c                       |    2 ++
 target-i386/cpu.c               |   10 ++++++++--
 8 files changed, 40 insertions(+), 19 deletions(-)

diff --git a/cpus.c b/cpus.c
index 2b5c0bd..cce2744 100644
--- a/cpus.c
+++ b/cpus.c
@@ -1394,6 +1394,7 @@ CpuInfoList *qmp_query_cpus(Error **errp)
 {
     CpuInfoList *head = NULL, *cur_item = NULL;
     CPUState *cpu;
+    CPUClass *cc;
 
     CPU_FOREACH(cpu) {
         CpuInfoList *info;
@@ -1411,11 +1412,12 @@ CpuInfoList *qmp_query_cpus(Error **errp)
         CPUMIPSState *env = &mips_cpu->env;
 #endif
 
+        cc = CPU_GET_CLASS(cpu);
         cpu_synchronize_state(cpu);
 
         info = g_malloc0(sizeof(*info));
         info->value = g_malloc0(sizeof(*info->value));
-        info->value->CPU = cpu->cpu_index;
+        info->value->CPU = cc->get_arch_id(cpu);
         info->value->current = (cpu == first_cpu);
         info->value->halted = cpu->halted;
         info->value->thread_id = cpu->thread_id;
diff --git a/exec.c b/exec.c
index 5f9857c..c514492 100644
--- a/exec.c
+++ b/exec.c
@@ -473,10 +473,28 @@ void tcg_cpu_address_space_init(CPUState *cpu, AddressSpace *as)
 }
 #endif
 
+void cpu_vmstate_register(CPUState *cpu)
+{
+    CPUClass *cc = CPU_GET_CLASS(cpu);
+    int cpu_index = cc->get_arch_id(cpu);
+
+    if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
+        vmstate_register(NULL, cpu_index, &vmstate_cpu_common, cpu);
+    }
+#if defined(CPU_SAVE_VERSION) && !defined(CONFIG_USER_ONLY)
+    register_savevm(NULL, "cpu", cpu_index, CPU_SAVE_VERSION,
+                    cpu_save, cpu_load, cpu->env_ptr);
+    assert(cc->vmsd == NULL);
+    assert(qdev_get_vmsd(DEVICE(cpu)) == NULL);
+#endif
+    if (cc->vmsd != NULL) {
+        vmstate_register(NULL, cpu_index, cc->vmsd, cpu);
+    }
+}
+
 void cpu_exec_init(CPUArchState *env)
 {
     CPUState *cpu = ENV_GET_CPU(env);
-    CPUClass *cc = CPU_GET_CLASS(cpu);
     CPUState *some_cpu;
     int cpu_index;
 
@@ -499,18 +517,6 @@ void cpu_exec_init(CPUArchState *env)
 #if defined(CONFIG_USER_ONLY)
     cpu_list_unlock();
 #endif
-    if (qdev_get_vmsd(DEVICE(cpu)) == NULL) {
-        vmstate_register(NULL, cpu_index, &vmstate_cpu_common, cpu);
-    }
-#if defined(CPU_SAVE_VERSION) && !defined(CONFIG_USER_ONLY)
-    register_savevm(NULL, "cpu", cpu_index, CPU_SAVE_VERSION,
-                    cpu_save, cpu_load, env);
-    assert(cc->vmsd == NULL);
-    assert(qdev_get_vmsd(DEVICE(cpu)) == NULL);
-#endif
-    if (cc->vmsd != NULL) {
-        vmstate_register(NULL, cpu_index, cc->vmsd, cpu);
-    }
 }
 
 #if defined(TARGET_HAS_ICE)
diff --git a/hw/intc/apic_common.c b/hw/intc/apic_common.c
index ce3d903..029f67d 100644
--- a/hw/intc/apic_common.c
+++ b/hw/intc/apic_common.c
@@ -345,7 +345,7 @@ static int apic_dispatch_post_load(void *opaque, int version_id)
     return 0;
 }
 
-static const VMStateDescription vmstate_apic_common = {
+const VMStateDescription vmstate_apic_common = {
     .name = "apic",
     .version_id = 3,
     .minimum_version_id = 3,
@@ -391,7 +391,6 @@ static void apic_common_class_init(ObjectClass *klass, void *data)
     ICCDeviceClass *idc = ICC_DEVICE_CLASS(klass);
     DeviceClass *dc = DEVICE_CLASS(klass);
 
-    dc->vmsd = &vmstate_apic_common;
     dc->reset = apic_reset_common;
     dc->props = apic_properties_common;
     idc->realize = apic_common_realize;
diff --git a/include/hw/i386/apic_internal.h b/include/hw/i386/apic_internal.h
index 83e2a42..2c91609 100644
--- a/include/hw/i386/apic_internal.h
+++ b/include/hw/i386/apic_internal.h
@@ -23,6 +23,7 @@
 #include "exec/memory.h"
 #include "hw/cpu/icc_bus.h"
 #include "qemu/timer.h"
+#include "migration/vmstate.h"
 
 /* APIC Local Vector Table */
 #define APIC_LVT_TIMER                  0
@@ -136,6 +137,7 @@ typedef struct VAPICState {
 } QEMU_PACKED VAPICState;
 
 extern bool apic_report_tpr_access;
+extern const VMStateDescription vmstate_apic_common;
 
 void apic_report_irq_delivered(int delivered);
 bool apic_next_timer(APICCommonState *s, int64_t current_time);
diff --git a/include/qom/cpu.h b/include/qom/cpu.h
index 1aafbf5..bc32c9a 100644
--- a/include/qom/cpu.h
+++ b/include/qom/cpu.h
@@ -549,6 +549,8 @@ void cpu_interrupt(CPUState *cpu, int mask);
 
 #endif /* USER_ONLY */
 
+void cpu_vmstate_register(CPUState *cpu);
+
 #ifdef CONFIG_SOFTMMU
 static inline void cpu_unassigned_access(CPUState *cpu, hwaddr addr,
                                          bool is_write, bool is_exec,
diff --git a/monitor.c b/monitor.c
index 34cee74..55fd06c 100644
--- a/monitor.c
+++ b/monitor.c
@@ -1032,7 +1032,9 @@ static CPUArchState *mon_get_cpu(void)
 int monitor_get_cpu_index(void)
 {
     CPUState *cpu = ENV_GET_CPU(mon_get_cpu());
-    return cpu->cpu_index;
+    CPUClass *cc = CPU_GET_CLASS(cpu);
+
+    return cc->get_arch_id(cpu);
 }
 
 static void do_info_registers(Monitor *mon, const QDict *qdict)
diff --git a/qom/cpu.c b/qom/cpu.c
index b32dd0a..bf16590 100644
--- a/qom/cpu.c
+++ b/qom/cpu.c
@@ -301,6 +301,8 @@ 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);
         notifier_list_notify(&cpu_added_notifiers, dev);
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 217500c..2aa2b31 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -2662,11 +2662,17 @@ static void x86_cpu_apic_create(X86CPU *cpu, Error **errp)
 
 static void x86_cpu_apic_realize(X86CPU *cpu, Error **errp)
 {
-    if (cpu->apic_state == NULL) {
+    DeviceState *apic_state = cpu->apic_state;
+    CPUClass *cc = CPU_GET_CLASS(CPU(cpu));
+
+    if (apic_state == NULL) {
         return;
     }
 
-    if (qdev_init(cpu->apic_state)) {
+    vmstate_register(0, cc->get_arch_id(CPU(cpu)),
+            &vmstate_apic_common, apic_state);
+
+    if (qdev_init(apic_state)) {
         error_setg(errp, "APIC device '%s' could not be initialized",
                    object_get_typename(OBJECT(cpu->apic_state)));
         return;
-- 
1.7.7