Re: [Qemu-devel] [PATCH v5 1/7] hmp: Add flag for preconfig commands

[Igor Mammedov <imammedo@redhat.com>]

On Wed, 20 Jun 2018 16:39:41 +0100
"Dr. David Alan Gilbert (git)" <dgilbert@redhat.com> wrote:

> From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
> 
> Add a flag to command definitions to allow them to be used in preconfig
> and check it.
> If users try to use commands that aren't available, tell them to use
> the exit_preconfig comand we're adding in a few patches.
> 
> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
> Reviewed-by: Markus Armbruster <armbru@redhat.com>

Reviewed-by: Igor Mammedov <imammedo@redhat.com>

> ---
>  monitor.c | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/monitor.c b/monitor.c
> index 885e000f9b..8dc86c0c3c 100644
> --- a/monitor.c
> +++ b/monitor.c
> @@ -128,6 +128,7 @@ typedef struct mon_cmd_t {
>      const char *args_type;
>      const char *params;
>      const char *help;
> +    const char *flags; /* p=preconfig */
>      void (*cmd)(Monitor *mon, const QDict *qdict);
>      /* @sub_table is a list of 2nd level of commands. If it does not exist,
>       * cmd should be used. If it exists, sub_table[?].cmd should be
> @@ -958,6 +959,19 @@ static int parse_cmdline(const char *cmdline,
>      return -1;
>  }
>  
> +/*
> + * Returns true if the command can be executed in preconfig mode
> + * i.e. it has the 'p' flag.
> + */
> +static bool cmd_can_preconfig(const mon_cmd_t *cmd)
> +{
> +    if (!cmd->flags) {
> +        return false;
> +    }
> +
> +    return strchr(cmd->flags, 'p');
> +}
> +
>  static void help_cmd_dump_one(Monitor *mon,
>                                const mon_cmd_t *cmd,
>                                char **prefix_args,
> @@ -3041,6 +3055,12 @@ static const mon_cmd_t *monitor_parse_command(Monitor *mon,
>                         (int)(p - cmdp_start), cmdp_start);
>          return NULL;
>      }
> +    if (runstate_check(RUN_STATE_PRECONFIG) && !cmd_can_preconfig(cmd)) {
> +        monitor_printf(mon, "Command '%.*s' not available with -preconfig "
> +                            "until after exit_preconfig.\n",
> +                       (int)(p - cmdp_start), cmdp_start);
> +        return NULL;
> +    }
>  
>      /* filter out following useless space */
>      while (qemu_isspace(*p)) {