Re: [Qemu-devel] [PATCH v2 21/24] numa: use possible_cpus for not mapped CPUs check

[Andrew Jones <drjones@redhat.com>]

On Wed, May 03, 2017 at 02:57:15PM +0200, Igor Mammedov wrote:
> and remove corresponding part in numa.c that uses
> node_cpu bitmaps.
> 
> Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
> ---
> It's one more less user of node_cpu bitmpas, following
> commit will remove the last user along with
> node_cpu itself.
> ---
>  hw/core/machine.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  numa.c            | 10 ----------
>  2 files changed, 58 insertions(+), 10 deletions(-)
> 
> diff --git a/hw/core/machine.c b/hw/core/machine.c
> index 217b4f4..4229054 100644
> --- a/hw/core/machine.c
> +++ b/hw/core/machine.c
> @@ -19,6 +19,7 @@
>  #include "sysemu/sysemu.h"
>  #include "qemu/error-report.h"
>  #include "qemu/cutils.h"
> +#include "sysemu/numa.h"
>  
>  static char *machine_get_accel(Object *obj, Error **errp)
>  {
> @@ -648,9 +649,66 @@ bool machine_mem_merge(MachineState *machine)
>      return machine->mem_merge;
>  }
>  
> +static char *cpu_slot_to_string(const CPUArchId *cpu)
> +{
> +    GString *s = g_string_new(NULL);
> +    if (cpu->props.has_socket_id) {
> +        g_string_append_printf(s, "socket-id: %"PRId64, cpu->props.socket_id);
> +    }
> +    if (cpu->props.has_core_id) {
> +        if (s->len) {
> +            g_string_append_printf(s, ", ");
> +        }
> +        g_string_append_printf(s, "core-id: %"PRId64, cpu->props.core_id);
> +    }
> +    if (cpu->props.has_thread_id) {
> +        if (s->len) {
> +            g_string_append_printf(s, ", ");
> +        }
> +        g_string_append_printf(s, "thread-id: %"PRId64, cpu->props.thread_id);
> +    }
> +    return g_string_free(s, false);
> +}
> +
> +static void machine_numa_validate(MachineState *machine)
> +{
> +    int i;
> +    GString *s = g_string_new(NULL);
> +    MachineClass *mc = MACHINE_GET_CLASS(machine);
> +    const CPUArchIdList *possible_cpus = mc->possible_cpu_arch_ids(machine);
> +
> +    assert(nb_numa_nodes);

Can't this be

 if (!nb_numa_nodes)
   return;

instead? And then..

> +    for (i = 0; i < possible_cpus->len; i++) {
> +        const CPUArchId *cpu_slot = &possible_cpus->cpus[i];
> +
> +        /* at this point numa mappings are initilized by CLI options
> +         * or with default mappings so it's sufficient to list
> +         * all not yet mapped CPUs here */
> +        /* TODO: make it hard error in future */
> +        if (!cpu_slot->props.has_node_id) {
> +            char *cpu_str = cpu_slot_to_string(cpu_slot);
> +            g_string_append_printf(s, "%sCPU %d [%s]", s->len ? ", " : "", i,
> +                                   cpu_str);
> +            g_free(cpu_str);
> +        }
> +    }
> +    if (s->len) {
> +        error_report("warning: CPU(s) not present in any NUMA nodes: %s",
> +                     s->str);
> +        error_report("warning: All CPU(s) up to maxcpus should be described "
> +                     "in NUMA config, ability to start up with partial NUMA "
> +                     "mappings is obsoleted and will be removed in future");
> +    }
> +    g_string_free(s, true);
> +}
> +
>  void machine_run_board_init(MachineState *machine)
>  {
>      MachineClass *machine_class = MACHINE_GET_CLASS(machine);
> +
> +    if (nb_numa_nodes) {
> +        machine_numa_validate(machine);
> +    }

...this condition wouldn't be necessary.

>      machine_class->init(machine);
>  }
>  
> diff --git a/numa.c b/numa.c
> index f8c849d..d7aa662 100644
> --- a/numa.c
> +++ b/numa.c
> @@ -293,16 +293,6 @@ static void validate_numa_cpus(void)
>          bitmap_or(seen_cpus, seen_cpus,
>                    numa_info[i].node_cpu, max_cpus);
>      }
> -
> -    if (!bitmap_full(seen_cpus, max_cpus)) {
> -        char *msg;
> -        bitmap_complement(seen_cpus, seen_cpus, max_cpus);
> -        msg = enumerate_cpus(seen_cpus, max_cpus);
> -        error_report("warning: CPU(s) not present in any NUMA nodes: %s", msg);
> -        error_report("warning: All CPU(s) up to maxcpus should be described "
> -                     "in NUMA config");
> -        g_free(msg);
> -    }
>      g_free(seen_cpus);
>  }
>  
> -- 
> 2.7.4
>

Otherwise
Reviewed-by: Andrew Jones <drjones@redhat.com>