diff --git a/osdk/src/bundle/mod.rs b/osdk/src/bundle/mod.rs
index 9a0f19bd..27da172d 100644
--- a/osdk/src/bundle/mod.rs
+++ b/osdk/src/bundle/mod.rs
@@ -219,17 +219,30 @@ impl Bundle {
             BootMethod::GrubRescueIso => {
                 let vm_image = self.manifest.vm_image.as_ref().unwrap();
                 assert!(matches!(vm_image.typ(), AsterVmImageType::GrubIso(_)));
+                let bootdev_opts = action
+                    .qemu
+                    .bootdev_append_options
+                    .as_deref()
+                    .unwrap_or(",index=2,media=cdrom");
                 qemu_cmd.arg("-drive").arg(format!(
-                    "file={},index=2,media=cdrom",
-                    self.path.join(vm_image.path()).to_string_lossy()
+                    "file={},format=raw{}",
+                    self.path.join(vm_image.path()).to_string_lossy(),
+                    bootdev_opts,
                 ));
             }
             BootMethod::GrubQcow2 => {
                 let vm_image = self.manifest.vm_image.as_ref().unwrap();
                 assert!(matches!(vm_image.typ(), AsterVmImageType::Qcow2(_)));
+                // FIXME: this doesn't work for regular QEMU, but may work for TDX.
+                let bootdev_opts = action
+                    .qemu
+                    .bootdev_append_options
+                    .as_deref()
+                    .unwrap_or(",if=virtio");
                 qemu_cmd.arg("-drive").arg(format!(
-                    "file={},index=0,media=disk,format=qcow2",
-                    self.path.join(vm_image.path()).to_string_lossy()
+                    "file={},format=qcow2{}",
+                    self.path.join(vm_image.path()).to_string_lossy(),
+                    bootdev_opts,
                 ));
             }
         };
diff --git a/osdk/src/cli.rs b/osdk/src/cli.rs
index 74df138b..fab56ccd 100644
--- a/osdk/src/cli.rs
+++ b/osdk/src/cli.rs
@@ -309,6 +309,13 @@ pub struct CommonArgs {
         global = true
     )]
     pub boot_method: Option<BootMethod>,
+    #[arg(
+        long = "bootdev-append-options",
+        help = "Additional QEMU `-drive` options for the boot device",
+        value_name = "OPTIONS",
+        global = true
+    )]
+    pub bootdev_append_options: Option<String>,
     #[arg(
         long = "display-grub-menu",
         help = "Display the GRUB menu if booting with GRUB",
diff --git a/osdk/src/config/mod.rs b/osdk/src/config/mod.rs
index 40dbe206..dea0b64f 100644
--- a/osdk/src/config/mod.rs
+++ b/osdk/src/config/mod.rs
@@ -72,6 +72,9 @@ fn apply_args_before_finalize(action_scheme: &mut ActionScheme, args: &CommonArg
         if let Some(path) = &args.qemu_exe {
             qemu.path = Some(path.clone());
         }
+        if let Some(bootdev_options) = &args.bootdev_append_options {
+            qemu.bootdev_append_options = Some(bootdev_options.clone());
+        }
     }
 }
 
diff --git a/osdk/src/config/scheme/qemu.rs b/osdk/src/config/scheme/qemu.rs
index 1a19200e..3b307aa9 100644
--- a/osdk/src/config/scheme/qemu.rs
+++ b/osdk/src/config/scheme/qemu.rs
@@ -16,6 +16,20 @@ pub struct QemuScheme {
     /// The additional arguments for running QEMU, in the form of raw
     /// command line arguments.
     pub args: Option<String>,
+    /// The additional qemu argument after the `-drive` option for the
+    /// boot device, in the form of raw command line arguments, comma
+    /// included. For example, `",if=virtio,media=disk,index=2"`.
+    /// The `format` and the `file` options are not allowed to set.
+    ///
+    /// This option only works with [`super::BootMethod::GrubQcow2`] and
+    /// [`super::BootMethod::GrubRescueIso`].
+    ///
+    /// This option exist because different firmwares may need
+    /// different interface types for the boot drive.
+    ///
+    /// See <https://www.qemu.org/docs/master/system/invocation.html>
+    /// for details about `-drive` option.
+    pub bootdev_append_options: Option<String>,
     /// The path of qemu
     pub path: Option<PathBuf>,
 }
@@ -23,6 +37,11 @@ pub struct QemuScheme {
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct Qemu {
     pub args: String,
+    /// This finalized config has a unorthodox `Option` because
+    /// we cannot provide a default value for it. The default
+    /// value is determined by the final running routine
+    /// [`crate::bundle::Bundle::run`].
+    pub bootdev_append_options: Option<String>,
     pub path: PathBuf,
 }
 
@@ -30,6 +49,7 @@ impl Default for Qemu {
     fn default() -> Self {
         Qemu {
             args: String::new(),
+            bootdev_append_options: None,
             path: PathBuf::from(get_default_arch().system_qemu()),
         }
     }
@@ -63,6 +83,7 @@ impl QemuScheme {
     pub fn finalize(self, arch: Arch) -> Qemu {
         Qemu {
             args: self.args.unwrap_or_default(),
+            bootdev_append_options: self.bootdev_append_options,
             path: self.path.unwrap_or(PathBuf::from(arch.system_qemu())),
         }
     }