diff --git a/src/dragonball/src/api/v1/mod.rs b/src/dragonball/src/api/v1/mod.rs
index 2077c982e9..99e3075ebb 100644
--- a/src/dragonball/src/api/v1/mod.rs
+++ b/src/dragonball/src/api/v1/mod.rs
@@ -4,9 +4,7 @@
 //! API Version 1 related data structures to configure the vmm.
 
 mod vmm_action;
-pub use self::vmm_action::{
-    VmmAction, VmmActionError, VmmData, VmmRequest, VmmResponse, VmmService,
-};
+pub use self::vmm_action::*;
 
 /// Wrapper for configuring the microVM boot source.
 mod boot_source;
diff --git a/src/dragonball/src/api/v1/vmm_action.rs b/src/dragonball/src/api/v1/vmm_action.rs
index 6dedbfc28e..2962994b4b 100644
--- a/src/dragonball/src/api/v1/vmm_action.rs
+++ b/src/dragonball/src/api/v1/vmm_action.rs
@@ -17,20 +17,20 @@ use crate::vm::{CpuTopology, KernelConfigInfo, VmConfigInfo};
 use crate::vmm::Vmm;
 
 #[cfg(feature = "virtio-blk")]
-use crate::device_manager::blk_dev_mgr::{
+pub use crate::device_manager::blk_dev_mgr::{
     BlockDeviceConfigInfo, BlockDeviceConfigUpdateInfo, BlockDeviceError, BlockDeviceMgr,
 };
 #[cfg(feature = "virtio-fs")]
-use crate::device_manager::fs_dev_mgr::{
+pub use crate::device_manager::fs_dev_mgr::{
     FsDeviceConfigInfo, FsDeviceConfigUpdateInfo, FsDeviceError, FsDeviceMgr, FsMountConfigInfo,
 };
 #[cfg(feature = "virtio-net")]
-use crate::device_manager::virtio_net_dev_mgr::{
+pub use crate::device_manager::virtio_net_dev_mgr::{
     VirtioNetDeviceConfigInfo, VirtioNetDeviceConfigUpdateInfo, VirtioNetDeviceError,
     VirtioNetDeviceMgr,
 };
 #[cfg(feature = "virtio-vsock")]
-use crate::device_manager::vsock_dev_mgr::{VsockDeviceConfigInfo, VsockDeviceError};
+pub use crate::device_manager::vsock_dev_mgr::{VsockDeviceConfigInfo, VsockDeviceError};
 
 use super::*;
 
diff --git a/src/dragonball/src/device_manager/vsock_dev_mgr.rs b/src/dragonball/src/device_manager/vsock_dev_mgr.rs
index 5e49bbfb37..4f0f074134 100644
--- a/src/dragonball/src/device_manager/vsock_dev_mgr.rs
+++ b/src/dragonball/src/device_manager/vsock_dev_mgr.rs
@@ -88,6 +88,20 @@ pub struct VsockDeviceConfigInfo {
     pub use_generic_irq: Option<bool>,
 }
 
+impl Default for VsockDeviceConfigInfo {
+    fn default() -> Self {
+        Self {
+            id: String::default(),
+            guest_cid: 0,
+            uds_path: None,
+            tcp_addr: None,
+            queue_size: Vec::from(QUEUE_SIZES),
+            use_shared_irq: None,
+            use_generic_irq: None,
+        }
+    }
+}
+
 impl VsockDeviceConfigInfo {
     /// Get number and size of queues supported.
     pub fn queue_sizes(&self) -> Vec<u16> {