Re: [Qemu-ppc] [PATCH] pseries: do not allow memory-less/cpu-less NUMA node

[David Gibson]

On Fri, Aug 30, 2019 at 06:13:45PM +0200, Laurent Vivier wrote:
> When we hotplug a CPU on memory-less/cpu-less node, the linux kernel
> crashes.
> 
> This happens because linux kernel needs to know the NUMA topology at
> start to be able to initialize the distance lookup table.
> 
> On pseries, the topology is provided by the firmware via the existing
> CPUs and memory information. Thus a node without memory and CPU cannot be
> discovered by the kernel.
> 
> To avoid the kernel crash, do not allow to start pseries with empty
> nodes.
> 
> Signed-off-by: Laurent Vivier <address@hidden>

Applied to ppc-for-4.2.

-- 
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!
http://www.ozlabs.org/~dgibson

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