main: Replace infinite busy loop on exit with a HLT instruction

This prevents the guest vCPU from needlessly spinning. Signed-off-by: Rob Bradford <[email protected]>
cloud-hypervisor · Sep 23, 2019 · ddecc33 · ddecc33
1 parent 91f37d2
commit ddecc33
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/src/main.rs b/src/main.rs
@@ -188,5 +188,9 @@ pub extern "C" fn _start() -> ! {
     boot_from_device(&mut device);
 
     #[allow(clippy::empty_loop)]
-    loop {}
+    loop {
+        unsafe {
+            asm!("hlt");
+        }
+    }
 }