Re: [Qemu-devel] [PATCH 2/3] nmi: make cpu-index argument optional

[Markus Armbruster <armbru@redhat.com>]

Lai Jiangshan <laijs@cn.fujitsu.com> writes:

> When the argument "cpu-index" is not given,
> then "nmi" command will inject NMI on all CPUs.
>
> This simulate the nmi button on physical machine.
>
> Signed-off-by:  Lai Jiangshan <laijs@cn.fujitsu.com>
> ---
> diff --git a/hmp-commands.hx b/hmp-commands.hx
> index 8de7aa3..d8fe4c0 100644
> --- a/hmp-commands.hx
> +++ b/hmp-commands.hx
> @@ -721,9 +721,9 @@ ETEXI
>  #if defined(TARGET_I386)
>      {
>          .name       = "nmi",
> -        .args_type  = "cpu-index:i",
> -        .params     = "cpu",
> -        .help       = "inject an NMI on the given CPU",
> +        .args_type  = "cpu-index:i?",
> +        .params     = "[cpu]",
> +        .help       = "inject an NMI on all CPUs or the given CPU",
>          .mhandler.cmd = do_inject_nmi,
>      },
>  #endif
> diff --git a/monitor.c b/monitor.c
> index c16b39d..45a8dc2 100644
> --- a/monitor.c
> +++ b/monitor.c
> @@ -2410,7 +2410,13 @@ static void do_wav_capture(Monitor *mon, const QDict *qdict)
>  static void do_inject_nmi(Monitor *mon, const QDict *qdict)
>  {
>      CPUState *env;
> -    int cpu_index = qdict_get_int(qdict, "cpu-index");
> +    int cpu_index = qdict_get_try_int(qdict, "cpu-index", -1);

Note that we interpret "nmi -1" as "nmi" (no argument).  Doesn't matter
now.  Does matter after the next patch, because that patch makes the
command when the argument doesn't make sense.  Except it doesn't for the
non-sensical argument -1.  Same problem with every existing use of
qdict_get_try_int() in the monitor.  Do we care?

> +
> +    if (cpu_index == -1) {
> +        for (env = first_cpu; env != NULL; env = env->next_cpu)
> +            cpu_interrupt(env, CPU_INTERRUPT_NMI);
> +        return;
> +    }
>  
>      for (env = first_cpu; env != NULL; env = env->next_cpu)
>          if (env->cpu_index == cpu_index) {