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From: Christian Borntraeger <borntraeger@de.ibm.com>
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Subject: Re: [Qemu-devel] [PATCH 0/4] s390: Allow hotplug of s390 CPUs
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To: =?UTF-8?Q?Andreas_F=c3=a4rber?= <afaerber@suse.de>, Matthew Rosato <mjrosato@linux.vnet.ibm.com>, qemu-devel@nongnu.org
Cc: cornelia.huck@de.ibm.com, agraf@suse.de, rth@twiddle.net

Am 09.11.2015 um 16:28 schrieb Andreas Färber:
> Hi,
> 
> Am 09.11.2015 um 16:17 schrieb Matthew Rosato:
>> To subsequently hotplug a CPU:
>>
>> Issue 'cpu-add <id>' from qemu monitor, or use virsh setvcpus --count <n> 
>> <domain>, where <n> is the total number of desired guest CPUs.
> 
> What exactly is still missing for you to use the standard device_add?
> 
> Last time I checked (a while ago...) some patches were stuck on the x86
> side, and I don't recall hearing any feedback from the s390x side in my
> KVM Forum CPU hotplug session.

libvirt uses "cpu-add" unconditionally for hotplugging, so we certainly 
want to support that.