From patchwork Thu Jul 22 02:15:12 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "wangyanan (Y)" X-Patchwork-Id: 1508509 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) 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=) 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 4GVbf25g4pz9sV8 for ; Thu, 22 Jul 2021 12:15:53 +1000 (AEST) Received: from localhost ([::1]:46188 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m6OFZ-0006mU-DT for incoming@patchwork.ozlabs.org; Wed, 21 Jul 2021 22:15:49 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:42722) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m6OFB-0006m7-Tj for qemu-devel@nongnu.org; Wed, 21 Jul 2021 22:15:25 -0400 Received: from szxga02-in.huawei.com ([45.249.212.188]:2164) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m6OF8-0007RD-Ug for qemu-devel@nongnu.org; Wed, 21 Jul 2021 22:15:25 -0400 Received: from dggemv703-chm.china.huawei.com (unknown [172.30.72.55]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4GVbY40Kkpz7xs0; Thu, 22 Jul 2021 10:11:36 +0800 (CST) Received: from dggpemm500023.china.huawei.com (7.185.36.83) by dggemv703-chm.china.huawei.com (10.3.19.46) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Thu, 22 Jul 2021 10:15:15 +0800 Received: from DESKTOP-TMVL5KK.china.huawei.com (10.174.187.128) by dggpemm500023.china.huawei.com (7.185.36.83) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Thu, 22 Jul 2021 10:15:15 +0800 From: Yanan Wang To: Subject: [PATCH for-6.1 1/1] machine: Disallow specifying topology parameters as zero Date: Thu, 22 Jul 2021 10:15:12 +0800 Message-ID: <20210722021512.2600-2-wangyanan55@huawei.com> X-Mailer: git-send-email 2.8.4.windows.1 In-Reply-To: <20210722021512.2600-1-wangyanan55@huawei.com> References: <20210722021512.2600-1-wangyanan55@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.174.187.128] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To dggpemm500023.china.huawei.com (7.185.36.83) X-CFilter-Loop: Reflected Received-SPF: pass client-ip=45.249.212.188; envelope-from=wangyanan55@huawei.com; helo=szxga02-in.huawei.com X-Spam_score_int: -22 X-Spam_score: -2.3 X-Spam_bar: -- X-Spam_report: (-2.3 / 5.0 requ) RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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 Maydell , Andrew Jones , =?utf-8?q?Daniel_P_=2E_Berrang=C3=A9?= , Eduardo Habkost , Pierre Morel , Pankaj Gupta , Cornelia Huck , Markus Armbruster , Yanan Wang , wanghaibin.wang@huawei.com, yuzenghui@huawei.com, Paolo Bonzini Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" In the SMP configuration, we should either specify a topology parameter with a reasonable value (equal to or greater than 1) or just leave it omitted and QEMU will calculate its value. Configurations which explicitly specify the topology parameters as zero like "sockets=0" are meaningless, so disallow them. However, the commit 1e63fe685804d (machine: pass QAPI struct to mc->smp_parse) has documented that '0' has the same semantics as omitting a parameter in the qapi comment for SMPConfiguration. So this patch fixes the doc and also adds the corresponding sanity check in the smp parsers. Reviewed-by: Andrew Jones Suggested-by: Andrew Jones Signed-off-by: Yanan Wang --- hw/core/machine.c | 30 ++++++++++++++++++++++-------- hw/i386/pc.c | 33 ++++++++++++++++++++++++--------- qapi/machine.json | 6 +++--- 3 files changed, 49 insertions(+), 20 deletions(-) diff --git a/hw/core/machine.c b/hw/core/machine.c index 775add0795..ada300542b 100644 --- a/hw/core/machine.c +++ b/hw/core/machine.c @@ -745,11 +745,24 @@ static void smp_parse(MachineState *ms, SMPConfiguration *config, Error **errp) { unsigned cpus = config->has_cpus ? config->cpus : 0; unsigned sockets = config->has_sockets ? config->sockets : 0; + unsigned dies = config->has_dies ? config->dies : 0; unsigned cores = config->has_cores ? config->cores : 0; unsigned threads = config->has_threads ? config->threads : 0; + unsigned maxcpus = config->has_maxcpus ? config->maxcpus : 0; + + if ((config->has_cpus && config->cpus == 0) || + (config->has_sockets && config->sockets == 0) || + (config->has_dies && config->dies == 0) || + (config->has_cores && config->cores == 0) || + (config->has_threads && config->threads == 0) || + (config->has_maxcpus && config->maxcpus == 0)) { + error_setg(errp, "parameters must be equal to or greater than one if provided"); + return; + } - if (config->has_dies && config->dies != 0 && config->dies != 1) { + if (dies > 1) { error_setg(errp, "dies not supported by this machine's CPU topology"); + return; } /* compute missing values, prefer sockets over cores over threads */ @@ -760,8 +773,8 @@ static void smp_parse(MachineState *ms, SMPConfiguration *config, Error **errp) sockets = sockets > 0 ? sockets : 1; cpus = cores * threads * sockets; } else { - ms->smp.max_cpus = config->has_maxcpus ? config->maxcpus : cpus; - sockets = ms->smp.max_cpus / (cores * threads); + maxcpus = maxcpus > 0 ? maxcpus : cpus; + sockets = maxcpus / (cores * threads); } } else if (cores == 0) { threads = threads > 0 ? threads : 1; @@ -778,26 +791,27 @@ static void smp_parse(MachineState *ms, SMPConfiguration *config, Error **errp) return; } - ms->smp.max_cpus = config->has_maxcpus ? config->maxcpus : cpus; + maxcpus = maxcpus > 0 ? maxcpus : cpus; - if (ms->smp.max_cpus < cpus) { + if (maxcpus < cpus) { error_setg(errp, "maxcpus must be equal to or greater than smp"); return; } - if (sockets * cores * threads != ms->smp.max_cpus) { + if (sockets * cores * threads != maxcpus) { error_setg(errp, "Invalid CPU topology: " "sockets (%u) * cores (%u) * threads (%u) " "!= maxcpus (%u)", sockets, cores, threads, - ms->smp.max_cpus); + maxcpus); return; } ms->smp.cpus = cpus; + ms->smp.sockets = sockets; ms->smp.cores = cores; ms->smp.threads = threads; - ms->smp.sockets = sockets; + ms->smp.max_cpus = maxcpus; } static void machine_get_smp(Object *obj, Visitor *v, const char *name, diff --git a/hw/i386/pc.c b/hw/i386/pc.c index c2b9d62a35..db93841097 100644 --- a/hw/i386/pc.c +++ b/hw/i386/pc.c @@ -716,9 +716,23 @@ static void pc_smp_parse(MachineState *ms, SMPConfiguration *config, Error **err { unsigned cpus = config->has_cpus ? config->cpus : 0; unsigned sockets = config->has_sockets ? config->sockets : 0; - unsigned dies = config->has_dies ? config->dies : 1; + unsigned dies = config->has_dies ? config->dies : 0; unsigned cores = config->has_cores ? config->cores : 0; unsigned threads = config->has_threads ? config->threads : 0; + unsigned maxcpus = config->has_maxcpus ? config->maxcpus : 0; + + if ((config->has_cpus && config->cpus == 0) || + (config->has_sockets && config->sockets == 0) || + (config->has_dies && config->dies == 0) || + (config->has_cores && config->cores == 0) || + (config->has_threads && config->threads == 0) || + (config->has_maxcpus && config->maxcpus == 0)) { + error_setg(errp, "parameters must be equal to or greater than one if provided"); + return; + } + + /* directly default dies to 1 if it's omitted */ + dies = dies > 0 ? dies : 1; /* compute missing values, prefer sockets over cores over threads */ if (cpus == 0 || sockets == 0) { @@ -728,8 +742,8 @@ static void pc_smp_parse(MachineState *ms, SMPConfiguration *config, Error **err sockets = sockets > 0 ? sockets : 1; cpus = cores * threads * dies * sockets; } else { - ms->smp.max_cpus = config->has_maxcpus ? config->maxcpus : cpus; - sockets = ms->smp.max_cpus / (cores * threads * dies); + maxcpus = maxcpus > 0 ? maxcpus : cpus; + sockets = maxcpus / (cores * threads * dies); } } else if (cores == 0) { threads = threads > 0 ? threads : 1; @@ -746,27 +760,28 @@ static void pc_smp_parse(MachineState *ms, SMPConfiguration *config, Error **err return; } - ms->smp.max_cpus = config->has_maxcpus ? config->maxcpus : cpus; + maxcpus = maxcpus > 0 ? maxcpus : cpus; - if (ms->smp.max_cpus < cpus) { + if (maxcpus < cpus) { error_setg(errp, "maxcpus must be equal to or greater than smp"); return; } - if (sockets * dies * cores * threads != ms->smp.max_cpus) { + if (sockets * dies * cores * threads != maxcpus) { error_setg(errp, "Invalid CPU topology deprecated: " "sockets (%u) * dies (%u) * cores (%u) * threads (%u) " "!= maxcpus (%u)", sockets, dies, cores, threads, - ms->smp.max_cpus); + maxcpus); return; } ms->smp.cpus = cpus; - ms->smp.cores = cores; - ms->smp.threads = threads; ms->smp.sockets = sockets; ms->smp.dies = dies; + ms->smp.cores = cores; + ms->smp.threads = threads; + ms->smp.max_cpus = maxcpus; } static diff --git a/qapi/machine.json b/qapi/machine.json index c3210ee1fb..9272cb3cf8 100644 --- a/qapi/machine.json +++ b/qapi/machine.json @@ -1288,8 +1288,8 @@ ## # @SMPConfiguration: # -# Schema for CPU topology configuration. "0" or a missing value lets -# QEMU figure out a suitable value based on the ones that are provided. +# Schema for CPU topology configuration. A missing value lets QEMU +# figure out a suitable value based on the ones that are provided. # # @cpus: number of virtual CPUs in the virtual machine # @@ -1297,7 +1297,7 @@ # # @dies: number of dies per socket in the CPU topology # -# @cores: number of cores per thread in the CPU topology +# @cores: number of cores per die in the CPU topology # # @threads: number of threads per core in the CPU topology #