From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:47959) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aVeDj-00029y-El for qemu-devel@nongnu.org; Tue, 16 Feb 2016 06:55:08 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aVeDg-00017g-8h for qemu-devel@nongnu.org; Tue, 16 Feb 2016 06:55:07 -0500 Received: from e06smtp10.uk.ibm.com ([195.75.94.106]:44090) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aVeDf-00016q-UO for qemu-devel@nongnu.org; Tue, 16 Feb 2016 06:55:04 -0500 Received: from localhost by e06smtp10.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 16 Feb 2016 11:55:01 -0000 Received: from b06cxnps4075.portsmouth.uk.ibm.com (d06relay12.portsmouth.uk.ibm.com [9.149.109.197]) by d06dlp02.portsmouth.uk.ibm.com (Postfix) with ESMTP id 5CDCA219005F for ; Tue, 16 Feb 2016 11:54:44 +0000 (GMT) Received: from d06av01.portsmouth.uk.ibm.com (d06av01.portsmouth.uk.ibm.com [9.149.37.212]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u1GBsxCN66519172 for ; Tue, 16 Feb 2016 11:54:59 GMT Received: from d06av01.portsmouth.uk.ibm.com (localhost [127.0.0.1]) by d06av01.portsmouth.uk.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id u1GBswlT029289 for ; Tue, 16 Feb 2016 04:54:58 -0700 References: <871t8kpo6j.fsf@emacs.mitica> From: Christian Borntraeger Message-ID: <56C30E11.8040606@de.ibm.com> Date: Tue, 16 Feb 2016 12:54:57 +0100 MIME-Version: 1.0 In-Reply-To: <871t8kpo6j.fsf@emacs.mitica> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] KVM call for agenda for 2016-02-16 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: quintela@redhat.com, qemu-develQEMU Developer , KVM devel mailing list Cc: Matthew Rosato , Peter Maydell , Eduardo Habkost , David Hildenbrand , Paul Mackerras , Bharata B Rao , =?UTF-8?Q?Andreas_F=c3=a4rber?= , David Gibson 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) Christian