From mboxrd@z Thu Jan  1 00:00:00 1970
From: Juan Quintela <quintela@redhat.com>
Subject: Re: KVM call for agenda for 2016-02-16
Date: Wed, 17 Feb 2016 23:51:47 +0100
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	<20160217204047.GD10796@thinpad.lan.raisama.net>
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Cc: Christian Borntraeger <borntraeger@de.ibm.com>,
	qemu-develQEMU Developer <qemu-devel@nongnu.org>,
	KVM devel mailing list <kvm@vger.kernel.org>,
	Andreas =?utf-8?Q?F=C3=A4rber?= <afaerber@suse.de>,
	Bharata B Rao <bharata@linux.vnet.ibm.com>,
	Matthew Rosato <mjrosato@linux.vnet.ibm.com>,
	David Hildenbrand <dahi@linux.vnet.ibm.com>,
	David Gibson <david@gibson.dropbear.id.au>,
	Peter Maydell <peter.maydell@linaro.org>,
	Paul Mackerras <paulus@samba.org>
To: Eduardo Habkost <ehabkost@redhat.com>
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In-Reply-To: <20160217204047.GD10796@thinpad.lan.raisama.net> (Eduardo
	Habkost's message of "Wed, 17 Feb 2016 18:40:47 -0200")
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Eduardo Habkost <ehabkost@redhat.com> wrote:
> On Tue, Feb 16, 2016 at 12:54:57PM +0100, Christian Borntraeger wrote:
>> So my quick and dirty summary of CPU as _I_ understand it
>> (and I only have some part time bandwidth at the moment for that)
>> 
>> x86 has cpu hotplug. Some history
>> qemu-kvm had cpu_set in the past
>> qemu has cpu_add for a while now
>> libvirt code uses cpu_add cross-platform out of the box
>> 
>> proposal to use device_add. Currently this has the following issues that
>> we need to discuss:
>> - will require capability checking and dual code in libvirt (and libvirt updates)
>> - Power has some constraints that are hard to model with just device add
>> 	- David Gibson proposes a two layer interface
>> 		- low level: device add cpu-package
>> 		- high level
>> - David Hildenbrand has some concerns regarding CPU models (with base model + feature
>>   on/off), as device_add needs instantiatable type
>> - devel_del: s390 has no interface for cpu removal (Matts latest patches reset the 
>> machine just like z/VM - until we have some interface)
>> - anything else? (cpu hotplug on ARM or MIPS?)
>> 
>> Would be good to use todays call to have a plan how to finish things soon.
>> (maybe even for 2.6)
>
> Did the call happen? I am away from work for most days during the
> next 2 weeks, so I couldn't attend.

Yeap.  I sent some minutes, but they are kind of incoherent, I hope that
Andreas or Christian fill the holes...

Later, Juan.