Re: [Qemu-devel] [PATCH v7 17/23] qapi: introduce new cmd option "allow-oob"

[Igor Mammedov <imammedo@redhat.com>]

On Wed, 24 Jan 2018 13:39:51 +0800
Peter Xu <peterx@redhat.com> wrote:

> Here "oob" stands for "Out-Of-Band".  When "allow-oob" is set, it means
> the command allows out-of-band execution.
> 
> The "oob" idea is proposed by Markus Armbruster in following thread:
> 
>   https://lists.gnu.org/archive/html/qemu-devel/2017-09/msg02057.html
> 
> This new "allow-oob" boolean will be exposed by "query-qmp-schema" as
> well for command entries, so that QMP clients can know which command can
> be used as out-of-band calls. For example the command "migrate"
> originally looks like:
> 
>   {"name": "migrate", "ret-type": "17", "meta-type": "command",
>    "arg-type": "86"}
> 
> And it'll be changed into:
> 
>   {"name": "migrate", "ret-type": "17", "allow-oob": false,
>    "meta-type": "command", "arg-type": "86"}
> 
> This patch only provides the QMP interface level changes.  It does not
> contains the real out-of-band execution implementation yet.
> 
> Suggested-by: Markus Armbruster <armbru@redhat.com>
> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
> Reviewed-by: Fam Zheng <famz@redhat.com>
> Signed-off-by: Peter Xu <peterx@redhat.com>
> ---
>  include/qapi/qmp/dispatch.h    |  1 +
>  qapi/introspect.json           |  6 +++++-
>  scripts/qapi-commands.py       | 19 ++++++++++++++-----
>  scripts/qapi-introspect.py     | 10 ++++++++--
>  scripts/qapi.py                | 15 ++++++++++-----
>  scripts/qapi2texi.py           |  2 +-
>  tests/qapi-schema/test-qapi.py |  2 +-
>  7 files changed, 40 insertions(+), 15 deletions(-)
> 
> diff --git a/include/qapi/qmp/dispatch.h b/include/qapi/qmp/dispatch.h
> index 20578dcd48..b76798800c 100644
> --- a/include/qapi/qmp/dispatch.h
> +++ b/include/qapi/qmp/dispatch.h
> @@ -23,6 +23,7 @@ typedef enum QmpCommandOptions
>  {
>      QCO_NO_OPTIONS = 0x0,
>      QCO_NO_SUCCESS_RESP = 0x1,
> +    QCO_ALLOW_OOB = 0x2,
Options are essentially bitmask,
so using shift for value would be more explicit way to express it.

  QCO_ALLOW_OOB = (1U << 1)

>  } QmpCommandOptions;
>  
>  typedef struct QmpCommand
[...]