Re: [Xen-devel] [PATCH] xen/cpu: Make VCPU hotplug code online CPUs properly.

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2012-02-10 at 14:43 +0000, Konrad Rzeszutek Wilk wrote:
> Offlining CPUs works. Onlining does not work anymore and it looks
> like we were missing a cpu_up() call in the hotplug bring up path.

Wasn't this a deliberate decision as part of the pvops upstreaming to be
consistent with native cpu hotplug? After hotplugging a CPU
administrator action is needed to actually online it.

http://xen.1045712.n5.nabble.com/cpu-down-but-no-cpu-up-in-drivers-xen-cpu-hotplug-c-td2545244.html

The fix is to add a udev rule:
http://wiki.xen.org/wiki/Paravirt_Linux_CPU_Hotplug

Ian.



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