From: David Gibson <david@gibson.dropbear.id.au>
To: Laurent Vivier <lvivier@redhat.com>
Cc: qemu-ppc@nongnu.org, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH] pseries: do not allow memory-less/cpu-less NUMA node
Date: Mon, 2 Sep 2019 19:14:23 +1000 [thread overview]
Message-ID: <20190902091423.GB30674@umbus.fritz.box> (raw)
In-Reply-To: <20190830161345.22436-1-lvivier@redhat.com>
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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 <lvivier@redhat.com>
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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prev parent reply other threads:[~2019-09-02 9:24 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-30 16:13 [Qemu-devel] [PATCH] pseries: do not allow memory-less/cpu-less NUMA node Laurent Vivier
2019-08-30 16:34 ` Daniel P. Berrangé
2019-08-30 17:45 ` [Qemu-devel] [Qemu-ppc] " Greg Kurz
2019-09-02 6:27 ` David Gibson
2019-09-02 8:57 ` Daniel P. Berrangé
2019-09-02 9:11 ` David Gibson
2019-09-02 13:58 ` Greg Kurz
2019-09-02 9:14 ` David Gibson [this message]
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