diff --git a/hw/intc/loongarch_ipi.c b/hw/intc/loongarch_ipi.c
index d6ab917..3e45381 100644
--- a/hw/intc/loongarch_ipi.c
+++ b/hw/intc/loongarch_ipi.c
@@ -238,14 +238,14 @@
 
 static const VMStateDescription vmstate_ipi_core = {
     .name = "ipi-single",
-    .version_id = 1,
-    .minimum_version_id = 1,
+    .version_id = 2,
+    .minimum_version_id = 2,
     .fields = (VMStateField[]) {
         VMSTATE_UINT32(status, IPICore),
         VMSTATE_UINT32(en, IPICore),
         VMSTATE_UINT32(set, IPICore),
         VMSTATE_UINT32(clear, IPICore),
-        VMSTATE_UINT32_ARRAY(buf, IPICore, 2),
+        VMSTATE_UINT32_ARRAY(buf, IPICore, IPI_MBX_NUM * 2),
         VMSTATE_END_OF_LIST()
     }
 };
diff --git a/include/hw/intc/loongarch_ipi.h b/include/hw/intc/loongarch_ipi.h
index 664e050..6c61947 100644
--- a/include/hw/intc/loongarch_ipi.h
+++ b/include/hw/intc/loongarch_ipi.h
@@ -28,6 +28,8 @@
 #define MAIL_SEND_OFFSET      0
 #define ANY_SEND_OFFSET       (IOCSR_ANY_SEND - IOCSR_MAIL_SEND)
 
+#define IPI_MBX_NUM           4
+
 #define TYPE_LOONGARCH_IPI "loongarch_ipi"
 OBJECT_DECLARE_SIMPLE_TYPE(LoongArchIPI, LOONGARCH_IPI)
 
@@ -37,7 +39,7 @@
     uint32_t set;
     uint32_t clear;
     /* 64bit buf divide into 2 32bit buf */
-    uint32_t buf[2];
+    uint32_t buf[IPI_MBX_NUM * 2];
     qemu_irq irq;
 } IPICore;