Re: [Qemu-devel] [PATCH] qapi: add 'query-target' command to return target arch/bit size

[Luiz Capitulino <lcapitulino@redhat.com>]

On Mon, 20 Aug 2012 15:31:38 +0100
"Daniel P. Berrange" <berrange@redhat.com> wrote:

> From: "Daniel P. Berrange" <berrange@redhat.com>
> 
> Add a 'query-target' QAPI command to allow management applications
> to determine what target architecture a QEMU binary is emulating
> without having to parse the binary name or -help output
> 
>   $ qmp-shell -p /tmp/qemu
>   (QEMU) query-target
>   {   u'return': {   u'arch': u'x86_64', u'bits': 64}}
> 
> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
> ---
>  arch_init.c      | 11 +++++++++++
>  qapi-schema.json | 25 +++++++++++++++++++++++++
>  qmp-commands.hx  |  5 +++++
>  3 files changed, 41 insertions(+)
> 
> diff --git a/arch_init.c b/arch_init.c
> index 9b46bfc..095672d 100644
> --- a/arch_init.c
> +++ b/arch_init.c
> @@ -1080,3 +1080,14 @@ int xen_available(void)
>      return 0;
>  #endif
>  }
> +
> +
> +TargetInfo *qmp_query_target(Error **errp)
> +{
> +    TargetInfo *info = g_malloc0(sizeof(*info));
> +
> +    info->arch = g_strdup(TARGET_ARCH);
> +    info->bits = TARGET_PHYS_ADDR_BITS;
> +
> +    return info;
> +}
> diff --git a/qapi-schema.json b/qapi-schema.json
> index 3d2b2d1..f0e3fe0 100644
> --- a/qapi-schema.json
> +++ b/qapi-schema.json
> @@ -2454,3 +2454,28 @@
>  #
>  ##
>  { 'command': 'query-fdsets', 'returns': ['FdsetInfo'] }
> +
> +##
> +# @TargetInfo:
> +#
> +# Information describing the QEMU target.
> +#
> +# @arch: the name of the target architecture (eg "x86_64", "i686", etc)

Should be an enum, otherwise looks good.

> +#
> +# @bits: number of bits in physical address (eg 32 or 64)
> +#
> +# Since: 1.2.0
> +##
> +{ 'type': 'TargetInfo',
> +  'data': { 'arch': 'str', 'bits': 'int' } }
> +
> +##
> +# @query-target:
> +#
> +# Return information about the target for this QEMU
> +#
> +# Returns: TargetInfo
> +#
> +# Since: 1.2.0
> +##
> +{ 'command': 'query-target', 'returns': 'TargetInfo' }
> diff --git a/qmp-commands.hx b/qmp-commands.hx
> index 2ce4ce6..00d798f 100644
> --- a/qmp-commands.hx
> +++ b/qmp-commands.hx
> @@ -2509,3 +2509,8 @@ EQMP
>          .mhandler.cmd_new = qmp_marshal_input_query_cpu_definitions,
>      },
>  
> +    {
> +        .name       = "query-target",
> +        .args_type  = "",
> +        .mhandler.cmd_new = qmp_marshal_input_query_target,
> +    },