Add ability to pass arbitrary args to qemu

src/qemu.rs

@@ -35,6 +35,9 @@ pub struct BootCmd {
     /// relative to the image's WORKINGDIR. Can be repeated.
     #[clap(long)]
     mount: Vec<String>,
+
+    /// Extra arguments to qemu
+    extra: Vec<String>,
 }
 
 /// Invoke `qemu` to boot a boco image. See [`BootCmd`] for options
@@ -48,6 +51,7 @@ pub(crate) fn boot(
         forward,
         cmd,
         mount,
+        extra,
     }: BootCmd,
 ) -> Result<()> {
     let reg_dir = registry_dir(&name)?;
@@ -165,7 +169,8 @@ pub(crate) fn boot(
         .args(["-no-reboot"])
         .args(["-append", &cmdline])
         .args(["-nographic"])
-        .args(["-nic", &network]);
+        .args(["-nic", &network])
+        .args(&extra);
 
     println!("{command:?}");