diff --git a/virtmanager/src/crosvm.rs b/virtmanager/src/crosvm.rs
index 057b791..4ae1fcd 100644
--- a/virtmanager/src/crosvm.rs
+++ b/virtmanager/src/crosvm.rs
@@ -29,19 +29,22 @@
     child: Child,
     /// The CID assigned to the VM for vsock communication.
     pub cid: Cid,
+    /// The filename of the config file that was used to start the VM. This may have changed since
+    /// it was read so it shouldn't be trusted; it is only stored for debugging purposes.
+    pub config_path: String,
 }
 
 impl VmInstance {
     /// Create a new `VmInstance` for the given process.
-    fn new(child: Child, cid: Cid) -> VmInstance {
-        VmInstance { child, cid }
+    fn new(child: Child, cid: Cid, config_path: &str) -> VmInstance {
+        VmInstance { child, cid, config_path: config_path.to_owned() }
     }
 
     /// Start an instance of `crosvm` to manage a new VM. The `crosvm` instance will be killed when
     /// the `VmInstance` is dropped.
-    pub fn start(config: &VmConfig, cid: Cid) -> Result<VmInstance, Error> {
+    pub fn start(config: &VmConfig, cid: Cid, config_path: &str) -> Result<VmInstance, Error> {
         let child = run_vm(config, cid)?;
-        Ok(VmInstance::new(child, cid))
+        Ok(VmInstance::new(child, cid, config_path))
     }
 }