From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.0 required=3.0 tests=DATE_IN_PAST_12_24, DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY,USER_AGENT_GIT autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5B33EC10F14 for ; Tue, 8 Oct 2019 09:01:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3360D206C2 for ; Tue, 8 Oct 2019 09:01:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="nIpOjhZa" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730118AbfJHJBq (ORCPT ); Tue, 8 Oct 2019 05:01:46 -0400 Received: from userp2120.oracle.com ([156.151.31.85]:51306 "EHLO userp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729772AbfJHJBq (ORCPT ); Tue, 8 Oct 2019 05:01:46 -0400 Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x988haR7176900; Tue, 8 Oct 2019 08:59:57 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id; s=corp-2019-08-05; bh=GG6cP5QBwbQ2dOIhVepa60W9cY9VD9HYe0NrpQU/UHY=; b=nIpOjhZaA3ifKtsH0MHXkLf4tMmBywm1QxQ96NRefEzjE95zQCiQPfBvoYxwfCBr4KlO qAce0qW7xqpqNHa7p1EmhX3yZuqiOHScxixjwp56SLrO6+F8e1dV+7Y3rOYu2/3g8GDZ QtuNZ/1XZIezCDNk7b+qubWSWk+BIHQszJNW0wS75FAxowm6eDvYHWV9j5RyfTWn+KJr dwHIAeZz5Rxlrr3Flc9fcd8WIGIha9Crhndms+TSZDUEkANNcEaRbWJmke//TvSENj4P CmB/YZOVwSw+74WwXUSmiO0Nci2mQL7LEOx35zGw45HFk8fXwUPNw4bXliYcf7bvnF/T 9g== Received: from userp3020.oracle.com (userp3020.oracle.com [156.151.31.79]) by userp2120.oracle.com with ESMTP id 2vektrbvhx-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 08 Oct 2019 08:59:56 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x988hu2O027563; Tue, 8 Oct 2019 08:59:56 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by userp3020.oracle.com with ESMTP id 2vg205ur5k-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 08 Oct 2019 08:59:56 +0000 Received: from abhmp0004.oracle.com (abhmp0004.oracle.com [141.146.116.10]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id x988xoHX006734; Tue, 8 Oct 2019 08:59:50 GMT Received: from z2.cn.oracle.com (/10.182.71.205) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 08 Oct 2019 01:59:50 -0700 From: Zhenzhong Duan To: linux-kernel@vger.kernel.org Cc: vkuznets@redhat.com, linux-hyperv@vger.kernel.org, kvm@vger.kernel.org, kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, sashal@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, pbonzini@redhat.com, rkrcmar@redhat.com, sean.j.christopherson@intel.com, wanpengli@tencent.com, jmattson@google.com, joro@8bytes.org, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, peterz@infradead.org, Zhenzhong Duan Subject: [PATCH v5 0/5] Add a unified parameter "nopvspin" Date: Mon, 7 Oct 2019 17:04:26 +0800 Message-Id: <1570439071-9814-1-git-send-email-zhenzhong.duan@oracle.com> X-Mailer: git-send-email 1.8.3.1 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9403 signatures=668684 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=1 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1910080089 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9403 signatures=668684 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1910080089 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org There are cases folks want to disable spinlock optimization for debug/test purpose. Xen and hyperv already have parameters "xen_nopvspin" and "hv_nopvspin" to support that, but kvm doesn't. The first patch adds that feature to KVM guest with "nopvspin". For compatibility reason original parameters "xen_nopvspin" and "hv_nopvspin" are retained and marked obsolete. v5: PATCH1: new patch to revert a currently unnecessory commit, code is simpler a bit after that change. [Boris Ostrovsky] PATCH3: fold 'if' statement,add comments on virt_spin_lock_key, reorder with PATCH2 to better reflect dependency PATCH4: fold 'if' statement, add Reviewed-by [Boris Ostrovsky] PATCH5: add Reviewed-by [Michael Kelley] v4: PATCH1: use variable name nopvspin instead of pvspin and defined it as __initdata, changed print message, updated patch description [Sean Christopherson] PATCH2: remove Suggested-by, use "kvm-guest:" prefix [Sean Christopherson] PATCH3: make variable nopvsin and xen_pvspin coexist remove Reviewed-by due to code change [Sean Christopherson] PATCH4: make variable nopvsin and hv_pvspin coexist [Sean Christopherson] v3: PATCH2: Fix indentation v2: PATCH1: pick the print code change into separate PATCH2, updated patch description [Vitaly Kuznetsov] PATCH2: new patch with print code change [Vitaly Kuznetsov] PATCH3: add Reviewed-by [Juergen Gross] Zhenzhong Duan (5): Revert "KVM: X86: Fix setup the virt_spin_lock_key before static key get initialized" x86/kvm: Change print code to use pr_*() format x86/kvm: Add "nopvspin" parameter to disable PV spinlocks xen: Mark "xen_nopvspin" parameter obsolete x86/hyperv: Mark "hv_nopvspin" parameter obsolete Documentation/admin-guide/kernel-parameters.txt | 14 +++++- arch/x86/hyperv/hv_spinlock.c | 4 ++ arch/x86/include/asm/qspinlock.h | 1 + arch/x86/kernel/kvm.c | 63 ++++++++++++++----------- arch/x86/xen/spinlock.c | 4 +- kernel/locking/qspinlock.c | 7 +++ 6 files changed, 62 insertions(+), 31 deletions(-) -- 1.8.3.1