Re: [Qemu-devel] [PATCH v3.2 02/31] NUMA: check if the total numa memory size is equal to ram_size

["Michael S. Tsirkin" <mst@redhat.com>]

On Wed, May 14, 2014 at 05:43:06PM +0800, Hu Tao wrote:
> From: Wanlong Gao <gaowanlong@cn.fujitsu.com>
> 
> If the total number of the assigned numa nodes memory is not
> equal to the assigned ram size, it will write the wrong data
> to ACPI table, then the guest will ignore the wrong ACPI table
> and recognize all memory to one node. It's buggy, we should
> check it to ensure that we write the right data to ACPI table.
> 
> Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
> Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
> ---
>  numa.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/numa.c b/numa.c
> index 395c14f..1d2f761 100644
> --- a/numa.c
> +++ b/numa.c
> @@ -27,6 +27,8 @@
>  #include "exec/cpu-common.h"
>  #include "qemu/bitmap.h"
>  #include "qom/cpu.h"
> +#include "qemu/error-report.h"
> +#include "include/exec/cpu-common.h" /* for RAM_ADDR_FMT */
>  
>  static void numa_node_parse_cpus(int nodenr, const char *cpus)
>  {
> @@ -127,6 +129,7 @@ void numa_add(const char *optarg)
>  void set_numa_nodes(void)
>  {
>      if (nb_numa_nodes > 0) {
> +        uint64_t numa_total;
>          int i;
>  
>          if (nb_numa_nodes > MAX_NODES) {
> @@ -154,6 +157,17 @@ void set_numa_nodes(void)
>              node_mem[i] = ram_size - usedmem;
>          }
>  
> +        numa_total = 0;
> +        for (i = 0; i < nb_numa_nodes; i++) {
> +            numa_total += node_mem[i];
> +        }
> +        if (numa_total != ram_size) {
> +            error_report("qemu: total memory size for NUMA nodes (%" PRIu64 ")"
> +                         " should equal to ram_size (" RAM_ADDR_FMT ")\n",

should equal RAM size

> +                         numa_total, ram_size);
> +            exit(1);
> +        }
> +
>          for (i = 0; i < nb_numa_nodes; i++) {
>              if (!bitmap_empty(node_cpumask[i], MAX_CPUMASK_BITS)) {
>                  break;
> -- 
> 1.8.5.2.229.g4448466
>