From patchwork Fri Aug 16 17:07:50 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eduardo Habkost X-Patchwork-Id: 1148366 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=redhat.com Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4698sc2nlLz9sML for ; Sat, 17 Aug 2019 03:08:20 +1000 (AEST) Received: from localhost ([::1]:58750 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1hyfi6-0004K7-6K for incoming@patchwork.ozlabs.org; Fri, 16 Aug 2019 13:08:18 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:49701) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1hyfhm-0004Ih-9K for qemu-devel@nongnu.org; Fri, 16 Aug 2019 13:07:59 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hyfhk-0007BM-Q4 for qemu-devel@nongnu.org; Fri, 16 Aug 2019 13:07:57 -0400 Received: from mx1.redhat.com ([209.132.183.28]:58996) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hyfhk-0007Ae-I6; Fri, 16 Aug 2019 13:07:56 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 8CD68308427C; Fri, 16 Aug 2019 17:07:55 +0000 (UTC) Received: from localhost (ovpn-116-32.gru2.redhat.com [10.97.116.32]) by smtp.corp.redhat.com (Postfix) with ESMTP id 5CACD87B6; Fri, 16 Aug 2019 17:07:52 +0000 (UTC) From: Eduardo Habkost To: qemu-devel@nongnu.org Date: Fri, 16 Aug 2019 14:07:50 -0300 Message-Id: <20190816170750.23910-1-ehabkost@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.40]); Fri, 16 Aug 2019 17:07:55 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v2] pc: Don't make die-id mandatory unless necessary X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Krempa , Vanderson Martins do Rosario , Eduardo Habkost , Like Xu , Erik Skultety , "Michael S. Tsirkin" , qemu-stable@nongnu.org, Markus Armbruster , Igor Mammedov , Paolo Bonzini , Richard Henderson Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" We have this issue reported when using libvirt to hotplug CPUs: https://bugzilla.redhat.com/show_bug.cgi?id=1741451 Basically, libvirt is not copying die-id from query-hotpluggable-cpus, but die-id is now mandatory. We could blame libvirt and say it is not following the documented interface, because we have this buried in the QAPI schema documentation: > Note: currently there are 5 properties that could be present > but management should be prepared to pass through other > properties with device_add command to allow for future > interface extension. This also requires the filed names to be kept in > sync with the properties passed to -device/device_add. But I don't think this would be reasonable from us. We can just make QEMU more flexible and let die-id to be omitted when there's no ambiguity. This will allow us to keep compatibility with existing libvirt versions. Test case included to ensure we don't break this again. Fixes: commit 176d2cda0dee ("i386/cpu: Consolidate die-id validity in smp context") Signed-off-by: Eduardo Habkost Reviewed-by: Igor Mammedov --- Changes v1 -> v2: * v1 was "pc: Don't make CPU properties mandatory unless necessary" * Make only die-id optional (Igor Mammedov) --- hw/i386/pc.c | 8 ++++++ tests/acceptance/pc_cpu_hotplug_props.py | 35 ++++++++++++++++++++++++ 2 files changed, 43 insertions(+) create mode 100644 tests/acceptance/pc_cpu_hotplug_props.py diff --git a/hw/i386/pc.c b/hw/i386/pc.c index 3ab4bcb3ca..9c3f6ae828 100644 --- a/hw/i386/pc.c +++ b/hw/i386/pc.c @@ -2406,6 +2406,14 @@ static void pc_cpu_pre_plug(HotplugHandler *hotplug_dev, int max_socket = (ms->smp.max_cpus - 1) / smp_threads / smp_cores / pcms->smp_dies; + /* + * die-id was optional in QEMU 4.0 and older, so keep it optional + * if there's only one die per socket. + */ + if (cpu->die_id < 0 && pcms->smp_dies == 1) { + cpu->die_id = 0; + } + if (cpu->socket_id < 0) { error_setg(errp, "CPU socket-id is not set"); return; diff --git a/tests/acceptance/pc_cpu_hotplug_props.py b/tests/acceptance/pc_cpu_hotplug_props.py new file mode 100644 index 0000000000..08b7e632c6 --- /dev/null +++ b/tests/acceptance/pc_cpu_hotplug_props.py @@ -0,0 +1,35 @@ +# +# Ensure CPU die-id can be omitted on -device +# +# Copyright (c) 2019 Red Hat Inc +# +# Author: +# Eduardo Habkost +# +# This library is free software; you can redistribute it and/or +# modify it under the terms of the GNU Lesser General Public +# License as published by the Free Software Foundation; either +# version 2 of the License, or (at your option) any later version. +# +# This library is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +# Lesser General Public License for more details. +# +# You should have received a copy of the GNU Lesser General Public +# License along with this library; if not, see . +# + +from avocado_qemu import Test + +class OmittedCPUProps(Test): + """ + :avocado: tags=arch:x86_64 + """ + def test_no_die_id(self): + self.vm.add_args('-nodefaults', '-S') + self.vm.add_args('-smp', '1,sockets=2,cores=2,threads=2,maxcpus=8') + self.vm.add_args('-cpu', 'qemu64') + self.vm.add_args('-device', 'qemu64-x86_64-cpu,socket-id=1,core-id=0,thread-id=0') + self.vm.launch() + self.assertEquals(len(self.vm.command('query-cpus')), 2)