Err… kvm-unit-tests patch if there is any doubt.
> On May 9, 2019, at 12:50 PM, Nadav Amit <nadav.amit@xxxxxxxxx> wrote:
>
> In some cases, shutdown through the test device and Bochs might fail.
> Just hang in a loop that executes halt in such cases.
>
> Signed-off-by: Nadav Amit <nadav.amit@xxxxxxxxx>
> ---
> lib/x86/io.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/lib/x86/io.c b/lib/x86/io.c
> index f3e01f7..e6372c6 100644
> --- a/lib/x86/io.c
> +++ b/lib/x86/io.c
> @@ -99,6 +99,10 @@ void exit(int code)
> #else
> asm volatile("out %0, %1" : : "a"(code), "d"((short)0xf4));
> #endif
> + /* Fallback */
> + while (1) {
> + asm volatile ("hlt" ::: "memory");
> + }
> __builtin_unreachable();
> }
>
> --
> 2.17.1
