diff --git a/devicemodel/hw/pci/wdt_i6300esb.c b/devicemodel/hw/pci/wdt_i6300esb.c
index 61f2a0b94..c049fdb7d 100644
--- a/devicemodel/hw/pci/wdt_i6300esb.c
+++ b/devicemodel/hw/pci/wdt_i6300esb.c
@@ -49,6 +49,7 @@
 
 #define WDT_TIMER_SIG			0x55AA
 #define DEFAULT_MAX_TIMER_VAL		0x000FFFFF
+#define	DEFAULT_RESET_TIMER_VAL		60
 
 /* for debug */
 /* #define WDT_DEBUG */
@@ -365,6 +366,31 @@ pci_wdt_deinit(struct vmctx *ctx, struct pci_vdev *dev, char *opts)
 	memset(&wdt_state, 0, sizeof(wdt_state));
 }
 
+/* stop/reset watchdog will be invoked during guest enter/exit S3.
+ * We stop watchdog timer when guest enter S3 to avoid watchdog trigger
+ * guest reset when guest is in S3 state.
+ *
+ * We reset watchdog with a long peroid (2 * 60s) during guest exit
+ * from S3 to handle system hang before watchdog in guest kernel start to
+ * work.
+ */
+void
+vm_stop_watchdog(struct vmctx *ctx)
+{
+	stop_wdt_timer();
+}
+
+void
+vm_reset_watchdog(struct vmctx *ctx)
+{
+	wdt_state.stage = 1;
+	wdt_state.timer1_val = DEFAULT_RESET_TIMER_VAL;
+	wdt_state.timer2_val = DEFAULT_RESET_TIMER_VAL;
+	wdt_state.unlock_state = 0;
+
+	start_wdt_timer();
+}
+
 struct pci_vdev_ops pci_ops_wdt = {
 	.class_name	= "wdt-i6300esb",
 	.vdev_init	= pci_wdt_init,
diff --git a/devicemodel/include/vmmapi.h b/devicemodel/include/vmmapi.h
index ba0a9b20e..0f8709aa6 100644
--- a/devicemodel/include/vmmapi.h
+++ b/devicemodel/include/vmmapi.h
@@ -148,4 +148,6 @@ int	vm_reset_ptdev_intx_info(struct vmctx *ctx, int virt_pin, bool pic_pin);
 int	vm_create_vcpu(struct vmctx *ctx, uint16_t vcpu_id);
 
 int	vm_get_cpu_state(struct vmctx *ctx, void *state_buf);
+void	vm_stop_watchdog(struct vmctx *ctx);
+void	vm_reset_watchdog(struct vmctx *ctx);
 #endif	/* _VMMAPI_H_ */