Re: [PATCH v7 1/4] qapi/machine.json: Add cluster-id

[wangyanan (Y)]

Hi Gavin,

On 2022/4/20 18:49, Gavin Shan wrote:
> This adds cluster-id in CPU instance properties, which will be used
> by arm/virt machine. Besides, the cluster-id is also verified or
> dumped in various spots:
>
>    * hw/core/machine.c::machine_set_cpu_numa_node() to associate
>      CPU with its NUMA node.
>
>    * hw/core/machine.c::machine_numa_finish_cpu_init() to associate
>      CPU with NUMA node when no default association isn't provided.
nit: It doesn't really matter too much. But maybe clearer to read a 
sentence like
"machine_numa_finish_cpu_init() to record CPU slots with no NUMA mapping 
set."

Thanks,
Yanan
>    * hw/core/machine-hmp-cmds.c::hmp_hotpluggable_cpus() to dump
>      cluster-id.
>
> Signed-off-by: Gavin Shan <gshan@redhat.com>
> Reviewed-by: Yanan Wang <wangyanan55@huawei.com>
> ---
>   hw/core/machine-hmp-cmds.c |  4 ++++
>   hw/core/machine.c          | 16 ++++++++++++++++
>   qapi/machine.json          |  6 ++++--
>   3 files changed, 24 insertions(+), 2 deletions(-)
>
> diff --git a/hw/core/machine-hmp-cmds.c b/hw/core/machine-hmp-cmds.c
> index 4e2f319aeb..5cb5eecbfc 100644
> --- a/hw/core/machine-hmp-cmds.c
> +++ b/hw/core/machine-hmp-cmds.c
> @@ -77,6 +77,10 @@ void hmp_hotpluggable_cpus(Monitor *mon, const QDict *qdict)
>           if (c->has_die_id) {
>               monitor_printf(mon, "    die-id: \"%" PRIu64 "\"\n", c->die_id);
>           }
> +        if (c->has_cluster_id) {
> +            monitor_printf(mon, "    cluster-id: \"%" PRIu64 "\"\n",
> +                           c->cluster_id);
> +        }
>           if (c->has_core_id) {
>               monitor_printf(mon, "    core-id: \"%" PRIu64 "\"\n", c->core_id);
>           }
> diff --git a/hw/core/machine.c b/hw/core/machine.c
> index 1e23fdc14b..ac91dfd834 100644
> --- a/hw/core/machine.c
> +++ b/hw/core/machine.c
> @@ -679,6 +679,11 @@ void machine_set_cpu_numa_node(MachineState *machine,
>               return;
>           }
>   
> +        if (props->has_cluster_id && !slot->props.has_cluster_id) {
> +            error_setg(errp, "cluster-id is not supported");
> +            return;
> +        }
> +
>           if (props->has_socket_id && !slot->props.has_socket_id) {
>               error_setg(errp, "socket-id is not supported");
>               return;
> @@ -698,6 +703,11 @@ void machine_set_cpu_numa_node(MachineState *machine,
>                   continue;
>           }
>   
> +        if (props->has_cluster_id &&
> +            props->cluster_id != slot->props.cluster_id) {
> +                continue;
> +        }
> +
>           if (props->has_die_id && props->die_id != slot->props.die_id) {
>                   continue;
>           }
> @@ -992,6 +1002,12 @@ static char *cpu_slot_to_string(const CPUArchId *cpu)
>           }
>           g_string_append_printf(s, "die-id: %"PRId64, cpu->props.die_id);
>       }
> +    if (cpu->props.has_cluster_id) {
> +        if (s->len) {
> +            g_string_append_printf(s, ", ");
> +        }
> +        g_string_append_printf(s, "cluster-id: %"PRId64, 
> cpu->props.cluster_id);
> +    }
>       if (cpu->props.has_core_id) {
>           if (s->len) {
>               g_string_append_printf(s, ", ");
> diff --git a/qapi/machine.json b/qapi/machine.json
> index d25a481ce4..4c417e32a5 100644
> --- a/qapi/machine.json
> +++ b/qapi/machine.json
> @@ -868,10 +868,11 @@
>   # @node-id: NUMA node ID the CPU belongs to
>   # @socket-id: socket number within node/board the CPU belongs to
>   # @die-id: die number within socket the CPU belongs to (since 4.1)
> -# @core-id: core number within die the CPU belongs to
> +# @cluster-id: cluster number within die the CPU belongs to (since 7.1)
> +# @core-id: core number within cluster the CPU belongs to
>   # @thread-id: thread number within core the CPU belongs to
>   #
> -# Note: currently there are 5 properties that could be present
> +# Note: currently there are 6 properties that could be present
>   #       but management should be prepared to pass through other
>   #       properties with device_add command to allow for future
>   #       interface extension. This also requires the filed names to be kept in
> @@ -883,6 +884,7 @@
>     'data': { '*node-id': 'int',
>               '*socket-id': 'int',
>               '*die-id': 'int',
> +            '*cluster-id': 'int',
>               '*core-id': 'int',
>               '*thread-id': 'int'
>     }