Add pre_save and post_load interfaces with ipi_common class, here only
framework ipi_common adds these interfaces. The defailed implementation
is LoongArchIPI child device in later.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
---
 hw/intc/loongson_ipi_common.c         | 28 +++++++++++++++++++++++++++
 include/hw/intc/loongson_ipi_common.h |  2 ++
 2 files changed, 30 insertions(+)

diff --git a/hw/intc/loongson_ipi_common.c b/hw/intc/loongson_ipi_common.c
index ff2cc8bc91..8cd78d4858 100644
--- a/hw/intc/loongson_ipi_common.c
+++ b/hw/intc/loongson_ipi_common.c
@@ -282,10 +282,38 @@ static void loongson_ipi_common_unrealize(DeviceState *dev)
     g_free(s->cpu);
 }
 
+static int loongson_ipi_common_pre_save(void *opaque)
+{
+    IPICore *ipicore = (IPICore *)opaque;
+    LoongsonIPICommonState *s = ipicore->ipi;
+    LoongsonIPICommonClass *licc = LOONGSON_IPI_COMMON_GET_CLASS(s);
+
+    if (licc->pre_save) {
+        return licc->pre_save(s);
+    }
+
+    return 0;
+}
+
+static int loongson_ipi_common_post_load(void *opaque, int version_id)
+{
+    IPICore *ipicore = (IPICore *)opaque;
+    LoongsonIPICommonState *s = ipicore->ipi;
+    LoongsonIPICommonClass *licc = LOONGSON_IPI_COMMON_GET_CLASS(s);
+
+    if (licc->post_load) {
+        return licc->post_load(s, version_id);
+    }
+
+    return 0;
+}
+
 static const VMStateDescription vmstate_ipi_core = {
     .name = "ipi-single",
     .version_id = 2,
     .minimum_version_id = 2,
+    .pre_save  = loongson_ipi_common_pre_save,
+    .post_load = loongson_ipi_common_post_load,
     .fields = (const VMStateField[]) {
         VMSTATE_UINT32(status, IPICore),
         VMSTATE_UINT32(en, IPICore),
diff --git a/include/hw/intc/loongson_ipi_common.h b/include/hw/intc/loongson_ipi_common.h
index b587f9c571..e58ce2aa1c 100644
--- a/include/hw/intc/loongson_ipi_common.h
+++ b/include/hw/intc/loongson_ipi_common.h
@@ -48,6 +48,8 @@ struct LoongsonIPICommonClass {
     AddressSpace *(*get_iocsr_as)(CPUState *cpu);
     int (*cpu_by_arch_id)(LoongsonIPICommonState *lics, int64_t id,
                           int *index, CPUState **pcs);
+    int (*pre_save)(void *opaque);
+    int (*post_load)(void *opaque, int version_id);
 };
 
 MemTxResult loongson_ipi_core_readl(void *opaque, hwaddr addr, uint64_t *data,
-- 
2.39.3