Re: [Qemu-devel] [PATCH v4 10/13] hmp: add hmp analogue for qmp-chardev-change

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* Anton Nefedov (anton.nefedov@virtuozzo.com) wrote:
> Signed-off-by: Anton Nefedov <anton.nefedov@virtuozzo.com>
> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
> CC: Dr. David Alan Gilbert <dgilbert@redhat.com>

Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

> ---
>  include/chardev/char.h | 10 ++++++++++
>  hmp.h                  |  1 +
>  chardev/char.c         |  2 +-
>  hmp-commands.hx        | 18 +++++++++++++++++-
>  hmp.c                  | 34 ++++++++++++++++++++++++++++++++++
>  tests/test-hmp.c       |  1 +
>  6 files changed, 64 insertions(+), 2 deletions(-)
> 
> diff --git a/include/chardev/char.h b/include/chardev/char.h
> index 22fd734..1604ea9 100644
> --- a/include/chardev/char.h
> +++ b/include/chardev/char.h
> @@ -81,6 +81,16 @@ Chardev *qemu_chr_new_from_opts(QemuOpts *opts,
>  void qemu_chr_parse_common(QemuOpts *opts, ChardevCommon *backend);
>  
>  /**
> + * @qemu_chr_parse_opts:
> + *
> + * Parse the options to the ChardevBackend struct.
> + *
> + * Returns: a new backend or NULL on error
> + */
> +ChardevBackend *qemu_chr_parse_opts(QemuOpts *opts,
> +                                    Error **errp);
> +
> +/**
>   * @qemu_chr_new:
>   *
>   * Create a new character backend from a URI.
> diff --git a/hmp.h b/hmp.h
> index d8b94ce..23e035c 100644
> --- a/hmp.h
> +++ b/hmp.h
> @@ -102,6 +102,7 @@ void hmp_nbd_server_start(Monitor *mon, const QDict *qdict);
>  void hmp_nbd_server_add(Monitor *mon, const QDict *qdict);
>  void hmp_nbd_server_stop(Monitor *mon, const QDict *qdict);
>  void hmp_chardev_add(Monitor *mon, const QDict *qdict);
> +void hmp_chardev_change(Monitor *mon, const QDict *qdict);
>  void hmp_chardev_remove(Monitor *mon, const QDict *qdict);
>  void hmp_qemu_io(Monitor *mon, const QDict *qdict);
>  void hmp_cpu_add(Monitor *mon, const QDict *qdict);
> diff --git a/chardev/char.c b/chardev/char.c
> index 6b2cb7b..8e8b881 100644
> --- a/chardev/char.c
> +++ b/chardev/char.c
> @@ -567,7 +567,7 @@ static const char *chardev_alias_translate(const char *name)
>      return name;
>  }
>  
> -static ChardevBackend *qemu_chr_parse_opts(QemuOpts *opts, Error **errp)
> +ChardevBackend *qemu_chr_parse_opts(QemuOpts *opts, Error **errp)
>  {
>      Error *local_err = NULL;
>      const ChardevClass *cc;
> diff --git a/hmp-commands.hx b/hmp-commands.hx
> index e763606..2cad758 100644
> --- a/hmp-commands.hx
> +++ b/hmp-commands.hx
> @@ -1724,7 +1724,23 @@ ETEXI
>  STEXI
>  @item chardev-add args
>  @findex chardev-add
> -chardev_add accepts the same parameters as the -chardev command line switch.
> +chardev-add accepts the same parameters as the -chardev command line switch.
> +
> +ETEXI
> +
> +    {
> +        .name       = "chardev-change",
> +        .args_type  = "id:s,args:s",
> +        .params     = "id args",
> +        .help       = "change chardev",
> +        .cmd        = hmp_chardev_change,
> +    },
> +
> +STEXI
> +@item chardev-change args
> +@findex chardev-change
> +chardev-change accepts existing chardev @var{id} and then the same arguments
> +as the -chardev command line switch (except for "id").
>  
>  ETEXI
>  
> diff --git a/hmp.c b/hmp.c
> index 8c72c58..91e4317 100644
> --- a/hmp.c
> +++ b/hmp.c
> @@ -2225,6 +2225,40 @@ void hmp_chardev_add(Monitor *mon, const QDict *qdict)
>      hmp_handle_error(mon, &err);
>  }
>  
> +void hmp_chardev_change(Monitor *mon, const QDict *qdict)
> +{
> +    const char *args = qdict_get_str(qdict, "args");
> +    const char *id;
> +    Error *err = NULL;
> +    ChardevBackend *backend = NULL;
> +    ChardevReturn *ret = NULL;
> +    QemuOpts *opts = qemu_opts_parse_noisily(qemu_find_opts("chardev"), args,
> +                                             true);
> +    if (!opts) {
> +        error_setg(&err, "Parsing chardev args failed");
> +        goto end;
> +    }
> +
> +    id = qdict_get_str(qdict, "id");
> +    if (qemu_opts_id(opts)) {
> +        error_setg(&err, "Unexpected 'id' parameter");
> +        goto end;
> +    }
> +
> +    backend = qemu_chr_parse_opts(opts, &err);
> +    if (!backend) {
> +        goto end;
> +    }
> +
> +    ret = qmp_chardev_change(id, backend, &err);
> +
> +end:
> +    qapi_free_ChardevReturn(ret);
> +    qapi_free_ChardevBackend(backend);
> +    qemu_opts_del(opts);
> +    hmp_handle_error(mon, &err);
> +}
> +
>  void hmp_chardev_remove(Monitor *mon, const QDict *qdict)
>  {
>      Error *local_err = NULL;
> diff --git a/tests/test-hmp.c b/tests/test-hmp.c
> index 99e35ec..299df19 100644
> --- a/tests/test-hmp.c
> +++ b/tests/test-hmp.c
> @@ -22,6 +22,7 @@ static int verbose;
>  static const char *hmp_cmds[] = {
>      "boot_set ndc",
>      "chardev-add null,id=testchardev1",
> +    "chardev-change testchardev1 ringbuf",
>      "chardev-remove testchardev1",
>      "commit all",
>      "cpu-add 1",
> -- 
> 2.7.4
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK