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Date: Fri, 12 Oct 2012 06:12:47 +0200
From: Christian Borntraeger <borntraeger@de.ibm.com>
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Subject: Re: [Qemu-devel] [PATCH 4/5] s390: sclp signal quiesce support
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To: Alexander Graf <agraf@suse.de>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>, Jens Freimann <jfrei@linux.vnet.ibm.com>, Heinz Graalfs <graalfs@linux.vnet.ibm.com>, qemu-devel <qemu-devel@nongnu.org>, Einar Lueck <elelueck@linux.vnet.ibm.com>

On 12/10/12 02:36, Alexander Graf wrote:
> 
> On 02.10.2012, at 09:33, Jens Freimann wrote:
> 
>> From: Heinz Graalfs <graalfs@linux.vnet.ibm.com>
>>
>> This implements the sclp signal quiesce event via the SCLP Event
>> Facility.
>> This allows to gracefully shutdown a guest by using system_powerdown
>> notifiers. It creates a service interrupt that will trigger a
>> Read Event Data command from the guest. This code will then add an
>> event that is interpreted by linux guests as ctrl-alt-del.
> 
> Doesn't ctrl-alt-del usually reboot the machine, not shut it down?

On my 390 systems it seems to shutdown, at least that happens on lpar and
z/VM as well as under KVM.