Re: [PATCH 02/15] vl: remove separate preconfig main_loop

[Igor Mammedov]

On Wed,  2 Dec 2020 03:18:41 -0500
Paolo Bonzini <pbonzini@redhat.com> wrote:

> Move post-preconfig initialization to the x-exit-preconfig.  If preconfig
> is not requested, just exit preconfig mode immediately with the QMP
> command.
> 
> As a result, the preconfig loop will run with accel_setup_post
> and os_setup_post restrictions (xen_restrict, chroot, etc.)
> already done.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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

> ---
>  include/sysemu/runstate.h |  1 -
>  monitor/qmp-cmds.c        |  9 ----
>  softmmu/vl.c              | 95 +++++++++++++++++----------------------
>  3 files changed, 41 insertions(+), 64 deletions(-)
> 
> diff --git a/include/sysemu/runstate.h b/include/sysemu/runstate.h
> index f760094858..e557f470d4 100644
> --- a/include/sysemu/runstate.h
> +++ b/include/sysemu/runstate.h
> @@ -41,7 +41,6 @@ typedef enum WakeupReason {
>      QEMU_WAKEUP_REASON_OTHER,
>  } WakeupReason;
>  
> -void qemu_exit_preconfig_request(void);
>  void qemu_system_reset_request(ShutdownCause reason);
>  void qemu_system_suspend_request(void);
>  void qemu_register_suspend_notifier(Notifier *notifier);
> diff --git a/monitor/qmp-cmds.c b/monitor/qmp-cmds.c
> index 501a3024c7..7ced7eb3e8 100644
> --- a/monitor/qmp-cmds.c
> +++ b/monitor/qmp-cmds.c
> @@ -102,15 +102,6 @@ void qmp_system_powerdown(Error **errp)
>      qemu_system_powerdown_request();
>  }
>  
> -void qmp_x_exit_preconfig(Error **errp)
> -{
> -    if (qdev_hotplug) {
> -        error_setg(errp, "The command is permitted only before machine 
> initialization");
> -        return;
> -    }
> -    qemu_exit_preconfig_request();
> -}
> -
>  void qmp_cont(Error **errp)
>  {
>      BlockBackend *blk;
> diff --git a/softmmu/vl.c b/softmmu/vl.c
> index ab2210bc79..abbbb83e1a 100644
> --- a/softmmu/vl.c
> +++ b/softmmu/vl.c
> @@ -1151,7 +1151,6 @@ static pid_t shutdown_pid;
>  static int powerdown_requested;
>  static int debug_requested;
>  static int suspend_requested;
> -static bool preconfig_exit_requested = true;
>  static WakeupReason wakeup_reason;
>  static NotifierList powerdown_notifiers =
>      NOTIFIER_LIST_INITIALIZER(powerdown_notifiers);
> @@ -1238,11 +1237,6 @@ static int qemu_debug_requested(void)
>      return r;
>  }
>  
> -void qemu_exit_preconfig_request(void)
> -{
> -    preconfig_exit_requested = true;
> -}
> -
>  /*
>   * Reset the VM. Issue an event unless @reason is SHUTDOWN_CAUSE_NONE.
>   */
> @@ -1464,10 +1458,6 @@ static bool main_loop_should_exit(void)
>      RunState r;
>      ShutdownCause request;
>  
> -    if (preconfig_exit_requested) {
> -        preconfig_exit_requested = false;
> -        return true;
> -    }
>      if (qemu_debug_requested()) {
>          vm_stop(RUN_STATE_DEBUG);
>      }
> @@ -3283,6 +3273,43 @@ static void qemu_machine_creation_done(void)
>      register_global_state();
>  }
>  
> +void qmp_x_exit_preconfig(Error **errp)
> +{
> +    if (qdev_hotplug) {
> +        error_setg(errp, "The command is permitted only before machine 
> initialization");
> +        return;
> +    }
> +
> +    qemu_init_board();
> +    qemu_create_cli_devices();
> +    qemu_machine_creation_done();
> +
> +    if (loadvm) {
> +        Error *local_err = NULL;
> +        if (load_snapshot(loadvm, &local_err) < 0) {
> +            error_report_err(local_err);
> +            autostart = 0;
> +            exit(1);
> +        }
> +    }
> +    if (replay_mode != REPLAY_MODE_NONE) {
> +        replay_vmstate_init();
> +    }
> +
> +    if (incoming) {
> +        Error *local_err = NULL;
> +        if (strcmp(incoming, "defer") != 0) {
> +            qmp_migrate_incoming(incoming, &local_err);
> +            if (local_err) {
> +                error_reportf_err(local_err, "-incoming %s: ", incoming);
> +                exit(1);
> +            }
> +        }
> +    } else if (autostart) {
> +        qmp_cont(NULL);
> +    }
> +}
> +
>  void qemu_init(int argc, char **argv, char **envp)
>  {
>      QemuOpts *opts;
> @@ -3847,7 +3874,6 @@ void qemu_init(int argc, char **argv, char **envp)
>                  }
>                  break;
>              case QEMU_OPTION_preconfig:
> -                preconfig_exit_requested = false;
>                  preconfig_requested = true;
>                  break;
>              case QEMU_OPTION_enable_kvm:
> @@ -4272,57 +4298,18 @@ void qemu_init(int argc, char **argv, char **envp)
>      qemu_resolve_machine_memdev();
>      parse_numa_opts(current_machine);
>  
> -    if (preconfig_requested) {
> -        qemu_init_displays();
> -    }
> -
> -    /* do monitor/qmp handling at preconfig state if requested */
> -    qemu_main_loop();
> -
> -    qemu_init_board();
> -
> -    qemu_create_cli_devices();
> -
> -    /* initialize displays after all errors have been reported */
> -    if (!preconfig_requested) {
> -        qemu_init_displays();
> -    }
> -    qemu_machine_creation_done();
> -
> -    if (loadvm) {
> -        Error *local_err = NULL;
> -        if (load_snapshot(loadvm, &local_err) < 0) {
> -            error_report_err(local_err);
> -            autostart = 0;
> -            exit(1);
> -        }
> -    }
> -    if (replay_mode != REPLAY_MODE_NONE) {
> -        replay_vmstate_init();
> -    }
> -
>      if (vmstate_dump_file) {
>          /* dump and exit */
>          dump_vmstate_json_to_file(vmstate_dump_file);
>          exit(0);
>      }
> -    if (incoming) {
> -        Error *local_err = NULL;
> -        if (strcmp(incoming, "defer") != 0) {
> -            qmp_migrate_incoming(incoming, &local_err);
> -            if (local_err) {
> -                error_reportf_err(local_err, "-incoming %s: ", incoming);
> -                exit(1);
> -            }
> -        }
> -    } else if (autostart) {
> -        qmp_cont(NULL);
> -    }
>  
> +    qemu_init_displays();
> +    if (!preconfig_requested) {
> +        qmp_x_exit_preconfig(&error_fatal);
> +    }
>      accel_setup_post(current_machine);
>      os_setup_post();
> -
> -    return;
>  }
>  
>  void qemu_cleanup(void)