[PATCH v3 6/7] Add support of *unrealize* for Loongarch cpu

[xianglai li]

Add the unrealize function to the Loongarch CPU for cpu hot-(un)plug

Cc: "Bernhard Beschow" <shen...@gmail.com>
Cc: "Salil Mehta" <salil.me...@opnsrc.net>
Cc: "Salil Mehta" <salil.me...@huawei.com>
Cc: Xiaojuan Yang <yangxiaoj...@loongson.cn>
Cc: Song Gao <gaos...@loongson.cn>
Cc: "Michael S. Tsirkin" <m...@redhat.com>
Cc: Igor Mammedov <imamm...@redhat.com>
Cc: Ani Sinha <anisi...@redhat.com>
Cc: Paolo Bonzini <pbonz...@redhat.com>
Cc: Richard Henderson <richard.hender...@linaro.org>
Cc: Eduardo Habkost <edua...@habkost.net>
Cc: Marcel Apfelbaum <marcel.apfelb...@gmail.com>
Cc: "Philippe Mathieu-Daudé" <phi...@linaro.org>
Cc: Yanan Wang <wangyana...@huawei.com>
Cc: "Daniel P. Berrangé" <berra...@redhat.com>
Cc: Peter Xu <pet...@redhat.com>
Cc: David Hildenbrand <da...@redhat.com>
Cc: Bibo Mao <maob...@loongson.cn>
Signed-off-by: xianglai li <lixiang...@loongson.cn>
---
 target/loongarch/cpu.c | 20 ++++++++++++++++++++
 target/loongarch/cpu.h |  1 +
 2 files changed, 21 insertions(+)

diff --git a/target/loongarch/cpu.c b/target/loongarch/cpu.c
index 40b856554f..92fb23704f 100644
--- a/target/loongarch/cpu.c
+++ b/target/loongarch/cpu.c
@@ -576,6 +576,22 @@ static void loongarch_cpu_realizefn(DeviceState *dev, 
Error **errp)
     lacc->parent_realize(dev, errp);
 }
 
+static void loongarch_cpu_unrealizefn(DeviceState *dev)
+{
+    LoongArchCPUClass *mcc = LOONGARCH_CPU_GET_CLASS(dev);
+
+#ifndef CONFIG_USER_ONLY
+    LoongArchCPU *cpu = LOONGARCH_CPU(dev);
+    CPULoongArchState *env = &cpu->env;
+
+    cpu_remove_sync(CPU(dev));
+    address_space_destroy(&env->address_space_iocsr);
+    memory_region_del_subregion(&env->system_iocsr, &env->iocsr_mem);
+#endif
+
+    mcc->parent_unrealize(dev);
+}
+
 #ifndef CONFIG_USER_ONLY
 static void loongarch_qemu_write(void *opaque, hwaddr addr,
                                  uint64_t val, unsigned size)
@@ -756,6 +772,9 @@ static void loongarch_cpu_class_init(ObjectClass *c, void 
*data)
     device_class_set_props(dc, loongarch_cpu_properties);
     device_class_set_parent_realize(dc, loongarch_cpu_realizefn,
                                     &lacc->parent_realize);
+    device_class_set_parent_unrealize(dc, loongarch_cpu_unrealizefn,
+                                      &lacc->parent_unrealize);
+
     resettable_class_set_parent_phases(rc, NULL, loongarch_cpu_reset_hold, 
NULL,
                                        &lacc->parent_phases);
 
@@ -777,6 +796,7 @@ static void loongarch_cpu_class_init(ObjectClass *c, void 
*data)
 #ifdef CONFIG_TCG
     cc->tcg_ops = &loongarch_tcg_ops;
 #endif
+    dc->user_creatable = true;
 }
 
 static gchar *loongarch32_gdb_arch_name(CPUState *cs)
diff --git a/target/loongarch/cpu.h b/target/loongarch/cpu.h
index 838492f014..ec4a9ff166 100644
--- a/target/loongarch/cpu.h
+++ b/target/loongarch/cpu.h
@@ -414,6 +414,7 @@ struct LoongArchCPUClass {
     /*< public >*/
 
     DeviceRealize parent_realize;
+    DeviceUnrealize parent_unrealize;
     ResettablePhases parent_phases;
 };
 
-- 
2.39.1