Re: [Qemu-devel] [PATCH 3/3] add cpu_set qmp command

[Jan Kiszka <jan.kiszka@siemens.com>]

On 2012-01-17 14:17, Igor Mammedov wrote:
> Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> ---
>  qapi-schema.json |    9 +++++++++
>  qmp-commands.hx  |   26 ++++++++++++++++++++++++++
>  qmp.c            |   15 +++++++++++++++
>  3 files changed, 50 insertions(+), 0 deletions(-)
> 
> diff --git a/qapi-schema.json b/qapi-schema.json
> index 44cf764..05cc582 100644
> --- a/qapi-schema.json
> +++ b/qapi-schema.json
> @@ -903,6 +903,15 @@
>  { 'command': 'cpu', 'data': {'index': 'int'} }
>  
>  ##
> +# @cpu_set
> +#
> +# Sets specified cpu to online/ofline mode
> +#
> +# Notes: semantics is : cpu_set x online|offline
> +##
> +{ 'command': 'cpu_set', 'data': {'cpu_index': 'int', 'status': 'str'} }
> +
> +##
>  # @memsave:
>  #
>  # Save a portion of guest memory to a file.
> diff --git a/qmp-commands.hx b/qmp-commands.hx
> index 7e3f4b9..ef1ac1e 100644
> --- a/qmp-commands.hx
> +++ b/qmp-commands.hx
> @@ -348,6 +348,32 @@ Note: CPUs' indexes are obtained with the 'query-cpus' command.
>  EQMP
>  
>      {
> +        .name       = "cpu_set",
> +        .args_type  = "cpu_index:i,status:s",
> +        .mhandler.cmd_new = qmp_marshal_input_cpu_set,
> +    },
> +
> +SQMP
> +cpu_set
> +-------
> +
> +Sets virtual cpu to online/ofline state
> +
> +Arguments:
> +
> +- "cpu_index": virtual cpu index (json-int)
> +- "status": desired state of cpu, online/offline (json-string)
> +
> +Example:
> +
> +-> { "execute": "cpu_set",
> +             "arguments": { "cpu_index": 2,
> +                            "status": "online" } }
> +<- { "return": {} }
> +
> +EQMP
> +
> +    {
>          .name       = "memsave",
>          .args_type  = "val:l,size:i,filename:s,cpu:i?",
>          .mhandler.cmd_new = qmp_marshal_input_memsave,
> diff --git a/qmp.c b/qmp.c
> index c74dde6..e2b268d 100644
> --- a/qmp.c
> +++ b/qmp.c
> @@ -101,6 +101,21 @@ void qmp_cpu(int64_t index, Error **errp)
>      /* Just do nothing */
>  }
>  
> +void qmp_cpu_set(int64_t cpu_index, const char *status, Error **errp)
> +{
> +    int state;
> +
> +    if (!strcmp(status, "online")) {
> +        state = 1;
> +    } else if (!strcmp(status, "offline")) {
> +        state = 0;
> +    } else {
> +        error_set(errp, QERR_INVALID_PARAMETER, status);
> +        return;
> +    }
> +    qemu_system_cpu_hot_add(cpu_index, state);
> +}
> +
>  #ifndef CONFIG_VNC
>  /* If VNC support is enabled, the "true" query-vnc command is
>     defined in the VNC subsystem */

This shouldn't go upstream. We rather need qdev'ified CPUs that can be
added and removed as any other device.

Jan

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