Re: [Qemu-devel] [PATCH v4 12/15] Add optional parameters to QMP command query-cpu-definitions

[Eduardo Habkost]

On Mon, Mar 30, 2015 at 04:28:25PM +0200, Michael Mueller wrote:
[...]
>  ##
>  # @query-cpu-definitions:
>  #
>  # Return a list of supported virtual CPU definitions
>  #
> +# @machine: #optional machine type (since 2.4)
> +#
> +# @accel: #optional accelerator id (since 2.4)
> +#
>  # Returns: a list of CpuDefInfo
>  #
>  # Since: 1.2.0
>  ##
> -{ 'command': 'query-cpu-definitions', 'returns': ['CpuDefinitionInfo'] }
> +{ 'command': 'query-cpu-definitions',
> +  'data': { '*machine': 'str', '*accel': 'AccelId' },
> +  'returns': ['CpuDefinitionInfo'] }

What happens if the new parameters are provided to an old QEMU version
that doesn't accept them? It looks like we need an introspection
mechanism or a new command name.

-- 
Eduardo