diff --git a/src/dragonball/src/api/v1/instance_info.rs b/src/dragonball/src/api/v1/instance_info.rs
index d457b6124b..ae159aa614 100644
--- a/src/dragonball/src/api/v1/instance_info.rs
+++ b/src/dragonball/src/api/v1/instance_info.rs
@@ -54,6 +54,8 @@ pub struct InstanceInfo {
     pub async_state: AsyncState,
     /// List of tids of vcpu threads (vcpu index, tid)
     pub tids: Vec<(u8, u32)>,
+    /// Last instance downtime
+    pub last_instance_downtime: u64,
 }
 
 impl InstanceInfo {
@@ -66,6 +68,7 @@ impl InstanceInfo {
             pid: std::process::id(),
             async_state: AsyncState::Uninitialized,
             tids: Vec::new(),
+            last_instance_downtime: 0,
         }
     }
 }
@@ -79,6 +82,7 @@ impl Default for InstanceInfo {
             pid: std::process::id(),
             async_state: AsyncState::Uninitialized,
             tids: Vec::new(),
+            last_instance_downtime: 0,
         }
     }
 }
diff --git a/src/dragonball/src/vm/mod.rs b/src/dragonball/src/vm/mod.rs
index 7afdefedcc..e372af51e9 100644
--- a/src/dragonball/src/vm/mod.rs
+++ b/src/dragonball/src/vm/mod.rs
@@ -420,6 +420,18 @@ impl Vm {
     pub fn resume_all_vcpus_with_downtime(&mut self) -> std::result::Result<(), VcpuManagerError> {
         self.vcpu_manager()?.resume_all_vcpus()?;
 
+        if self.start_instance_downtime != 0 {
+            let now = TimestampUs::default();
+            let downtime = now.time_us - self.start_instance_downtime;
+            info!(self.logger, "VM: instance downtime: {} us", downtime);
+            self.start_instance_downtime = 0;
+            if let Ok(mut info) = self.shared_info.write() {
+                info.last_instance_downtime = downtime;
+            } else {
+                error!(self.logger, "Failed to update live upgrade downtime, couldn't be written due to poisoned lock");
+            }
+        }
+
         Ok(())
     }