Re: [PATCH v3 1/2] numa: Require distance map when empty node exists

[Andrew Jones]

On Wed, Oct 13, 2021 at 12:58:04PM +0800, Gavin Shan wrote:
> The following option is used to specify the distance map. It's
> possible the option isn't provided by user. In this case, the
> distance map isn't populated and exposed to platform. On the
> other hand, the empty NUMA node, where no memory resides, is
> allowed on platforms like ARM64 virt. For these empty NUMA
> nodes, their corresponding device-tree nodes aren't populated,
> but their NUMA IDs should be included in the "/distance-map"
> device-tree node, so that kernel can probe them properly if
> device-tree is used.
> 
>   -numa,dist,src=<numa_id>,dst=<numa_id>,val=<distance>
> 
> This adds extra check after the machine is initialized, to
> ask for the distance map from user when empty nodes exist in
> device-tree.
> 
> Signed-off-by: Gavin Shan <gshan@redhat.com>
> ---
>  hw/core/machine.c     |  4 ++++
>  hw/core/numa.c        | 24 ++++++++++++++++++++++++
>  include/sysemu/numa.h |  1 +
>  3 files changed, 29 insertions(+)
>

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