diff --git a/vm-virtio/src/device.rs b/vm-virtio/src/device.rs
index ab05ef073..f149fafda 100644
--- a/vm-virtio/src/device.rs
+++ b/vm-virtio/src/device.rs
@@ -34,6 +34,15 @@ pub trait VirtioInterrupt: Send + Sync {
 pub type VirtioIommuRemapping =
     Box<dyn Fn(u64) -> std::result::Result<u64, std::io::Error> + Send + Sync>;
 
+#[derive(Clone)]
+pub struct UserspaceMapping {
+    pub host_addr: u64,
+    pub mem_slot: u32,
+    pub addr: GuestAddress,
+    pub len: GuestUsize,
+    pub mergeable: bool,
+}
+
 #[derive(Clone)]
 pub struct VirtioSharedMemory {
     pub offset: u64,
@@ -120,6 +129,11 @@ pub trait VirtioDevice: Send {
     fn update_memory(&mut self, _mem: &GuestMemoryMmap) -> std::result::Result<(), Error> {
         Ok(())
     }
+
+    /// Returns the list of userspace mappings associated with this device.
+    fn userspace_mappings(&self) -> Vec<UserspaceMapping> {
+        Vec::new()
+    }
 }
 
 /// Trait providing address translation the same way a physical DMA remapping