diff --git a/src/lib.rs b/src/lib.rs
index d7c7b24..6875027 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -30,6 +30,9 @@ use crate::log::{error, info};
 /// ioctl to read the PCI device ID and type (and possibly other things) from the GPU.
 const REQ_QUERY_GPU: c_ulong = 0xc020462a;
 
+/// `result` is a pointer to `VgpuStart`.
+const OP_READ_START_CALL: u32 = 0xc01;
+
 /// `result` is a pointer to `uint32_t`.
 const OP_READ_DEV_TYPE: u32 = 0x800289;
 
@@ -72,6 +75,37 @@ struct Request {
     status: u32,
 }
 
+#[derive(Clone, Copy)]
+#[repr(C)]
+struct Uuid(u32, u16, u16, [u8; 8]);
+
+impl fmt::Display for Uuid {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(
+            f,
+            "{:08x}-{:04x}-{:04x}-{:02x}{:02x}-{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}",
+            self.0,
+            self.1,
+            self.2,
+            self.3[0],
+            self.3[1],
+            self.3[2],
+            self.3[3],
+            self.3[4],
+            self.3[5],
+            self.3[6],
+            self.3[7]
+        )
+    }
+}
+
+#[repr(C)]
+struct VgpuStart {
+    uuid: Uuid,
+    config_params: [u8; 1024],
+    unknown_410: [u8; 16],
+}
+
 #[repr(C)]
 struct VgpuConfig {
     gpu_type: u32,
@@ -127,6 +161,16 @@ struct VgpuProfileOverride<'a> {
     license_type: Option<&'a str>,
 }
 
+impl fmt::Debug for VgpuStart {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_struct("VgpuStart")
+            .field("uuid", &format_args!("{{{}}}", self.uuid))
+            .field("config_params", &CStrFormat(&self.config_params))
+            .field("unknown_410", &StraightFormat(&self.unknown_410))
+            .finish()
+    }
+}
+
 impl fmt::Debug for VgpuConfig {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.debug_struct("VgpuConfig")
@@ -262,6 +306,10 @@ pub unsafe extern "C" fn ioctl(fd: RawFd, request: c_ulong, argp: *mut c_void) -
                 return -1;
             }
         }
+        OP_READ_START_CALL => {
+            let config = &*(io_data.result as *const VgpuStart);
+            info!("{:#?}", config);
+        }
         _ => {}
     }