From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Vrabel <david.vrabel@citrix.com>
Subject: Re: [PATCH 2/4] Add tools/tests/offline_module
Date: Thu, 12 Dec 2013 11:09:42 +0000
Message-ID: <52A99976.2020505@citrix.com>
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To: Ian Campbell <Ian.Campbell@citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>, xen-devel@lists.xen.org, Keir Fraser <keir@xen.org>, Don Slutz <dslutz@verizon.com>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>
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On 12/12/13 10:01, Ian Campbell wrote:
> On Wed, 2013-12-11 at 19:56 -0500, Don Slutz wrote:
>> From: Don Slutz <dslutz@verizon.com>
>>
>> This is a quick and dirty linux kernel module to offline some cpus
>> as far as Xen knows.
>>
>> This can be used to re-create the bug in hvm_save_one about
>> returning the wrong data.
> 
> Can this not be done via /sys/devices/system/cpu/cpu1/online etc?
> Documentation/cpu-hotplug.txt seems to suggest it can.

Yes it can.

echo 0 > /sys/devices/system/cpu/cpuN/online

And onlined again with 1.

David