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 20FF8CA9EA0 for ; Tue, 22 Oct 2019 09:08:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DD63220663 for ; Tue, 22 Oct 2019 09:08:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="HIgodUMs" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388594AbfJVJIg (ORCPT ); Tue, 22 Oct 2019 05:08:36 -0400 Received: from aserp2120.oracle.com ([141.146.126.78]:50640 "EHLO aserp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388565AbfJVJIf (ORCPT ); Tue, 22 Oct 2019 05:08:35 -0400 Received: from pps.filterd (aserp2120.oracle.com [127.0.0.1]) by aserp2120.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x9M94JXw156336; Tue, 22 Oct 2019 09:06:27 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=z26nZqDxzBOJ9BRfbSpqDpmsq0mVNNYQLDQL4WWklhc=; b=HIgodUMs9ZAbI6mH8+OJx/CTveL/ZDZUlvQ1TK9BjEaPawvfoZ/ZJMPAIHKHTRF5mcs7 gYIuc8aYW2jcbW44bsg4ROuMW6xqNsp4r1l4ymwWmUfYbUS7HqZWApB30EQ15g7Wb14a T2g7VLoL8sS7PWCkZ9LBgPwhutXZc37mDwtHSOPW45gpwV+smSPktILa9iaHAQmpvvHE /EBvqORUSoxJDRg0DLAqf3ekx9PD3nkzlxffAJlvd/bSRWbGBZYJdW/z5O4yJuTtCeUD C69XyztcMJ+z00Uemi3Jwoeb1r8/GzbJ1Mmp5n1/iJD0pxzxg0vc9EBo7iFuHzj8Q2Br 3A== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by aserp2120.oracle.com with ESMTP id 2vqtepn899-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 22 Oct 2019 09:06:27 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x9M937NR014871; Tue, 22 Oct 2019 09:06:26 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by userp3030.oracle.com with ESMTP id 2vsx2qbb6j-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 22 Oct 2019 09:06:26 +0000 Received: from abhmp0010.oracle.com (abhmp0010.oracle.com [141.146.116.16]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x9M96H0I006689; Tue, 22 Oct 2019 09:06:21 GMT Received: from z2.cn.oracle.com (/10.182.70.159) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 22 Oct 2019 09:06:17 +0000 From: Zhenzhong Duan To: linux-kernel@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, pbonzini@redhat.com, rkrcmar@redhat.com, sean.j.christopherson@intel.com, vkuznets@redhat.com, wanpengli@tencent.com, jmattson@google.com, joro@8bytes.org, boris.ostrovsky@oracle.com, jgross@suse.com, peterz@infradead.org, will@kernel.org, linux-hyperv@vger.kernel.org, kvm@vger.kernel.org, mikelley@microsoft.com, kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, sashal@kernel.org, Zhenzhong Duan Subject: [PATCH v7 0/5] Add a unified parameter "nopvspin" Date: Mon, 21 Oct 2019 17:11:11 +0800 Message-Id: <1571649076-2421-1-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=9417 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-1910220086 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9417 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-1910220086 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org All the patches have Reviewed-by now, I think v7 could be the final version. 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. v7: PATCH3: update comment and use goto, add RB [Vitaly Kuznetsov] v6: PATCH1: add Reviewed-by [Vitaly Kuznetsov] PATCH2: change 'pv' to 'PV', add Reviewed-by [Vitaly Kuznetsov] PATCH3: refactor 'if' branch in kvm_spinlock_init() [Vitaly Kuznetsov] 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 | 74 +++++++++++++++---------- arch/x86/xen/spinlock.c | 4 +- kernel/locking/qspinlock.c | 7 +++ 6 files changed, 71 insertions(+), 33 deletions(-) -- 1.8.3.1