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=-9.0 required=3.0 tests=DATE_IN_PAST_12_24, DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,USER_AGENT_GIT autolearn=ham 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 A07E2C47404 for ; Fri, 4 Oct 2019 14:00:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6DD2520873 for ; Fri, 4 Oct 2019 14:00:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="fWmCqElB" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388960AbfJDOAL (ORCPT ); Fri, 4 Oct 2019 10:00:11 -0400 Received: from userp2120.oracle.com ([156.151.31.85]:46122 "EHLO userp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388333AbfJDOAI (ORCPT ); Fri, 4 Oct 2019 10:00:08 -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 x94Ds3Yq013735; Fri, 4 Oct 2019 13:58:11 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=corp-2019-08-05; bh=5ydUihIrhjeEPCSvCHVIFnPJdjnu8s6v3JSIMDkxp2c=; b=fWmCqElBlrLepnDwBrQ47AgbVWzFBpaNadiYrUWn8q4I1GxVhIks9rnwyacYpb+BRe9a K//UQQw1Vg68+PNzv38SjPsBiWB0aforbAnSC0ayX73xHJCShuioZlaIIA/xlXoMGSDR LvliiN6VLnKl0g+czym1UuvK96V8ncwhBOKZMyo7Joec1HjiXL3lFOV4OFQLSjPxhDb3 Y482c/iXXszpluXXfNL38IA22erwoj0peWvDMlE6QfZ8gJ02mrDixadYTvdpw6UTV+fu mF3vR1ZGC8wwI1xUeR2FAZtvewxYLuUi4rRkuKCIFQtZd8tOMAMPHuYcvO9LtzWX3RKk Pw== Received: from aserp3030.oracle.com (aserp3030.oracle.com [141.146.126.71]) by userp2120.oracle.com with ESMTP id 2va05sbh68-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 04 Oct 2019 13:58:10 +0000 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x94DrXFG062458; Fri, 4 Oct 2019 13:58:10 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by aserp3030.oracle.com with ESMTP id 2vdxu8t085-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 04 Oct 2019 13:58:09 +0000 Received: from abhmp0011.oracle.com (abhmp0011.oracle.com [141.146.116.17]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x94Dw2la026435; Fri, 4 Oct 2019 13:58:02 GMT Received: from z2.cn.oracle.com (/10.182.71.205) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 04 Oct 2019 06:58:01 -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 , Jonathan Corbet , "H. Peter Anvin" , Will Deacon Subject: [PATCH v4 1/4] x86/kvm: Add "nopvspin" parameter to disable PV spinlocks Date: Thu, 3 Oct 2019 22:02:12 +0800 Message-Id: <1570111335-12731-2-git-send-email-zhenzhong.duan@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1570111335-12731-1-git-send-email-zhenzhong.duan@oracle.com> References: <1570111335-12731-1-git-send-email-zhenzhong.duan@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9399 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-1910040130 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9399 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=1015 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-1910040130 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org There are cases where a guest tries to switch spinlocks to bare metal behavior (e.g. by setting "xen_nopvspin" on XEN platform and "hv_nopvspin" on HYPER_V). That feature is missed on KVM, add a new parameter "nopvspin" to disable PV spinlocks for KVM guest. The new 'nopvspin' parameter will also replace Xen and Hyper-V specific parameters in future patches. Define variable nopvsin as global because it will be used in future patches as above. Signed-off-by: Zhenzhong Duan Cc: Jonathan Corbet Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: "H. Peter Anvin" Cc: Paolo Bonzini Cc: Radim Krcmar Cc: Sean Christopherson Cc: Vitaly Kuznetsov Cc: Wanpeng Li Cc: Jim Mattson Cc: Joerg Roedel Cc: Peter Zijlstra Cc: Will Deacon --- Documentation/admin-guide/kernel-parameters.txt | 5 +++++ arch/x86/include/asm/qspinlock.h | 1 + arch/x86/kernel/kvm.c | 21 ++++++++++++++------- kernel/locking/qspinlock.c | 7 +++++++ 4 files changed, 27 insertions(+), 7 deletions(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index c7ac2f3..89d77ea 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -5330,6 +5330,11 @@ as generic guest with no PV drivers. Currently support XEN HVM, KVM, HYPER_V and VMWARE guest. + nopvspin [X86,KVM] + Disables the qspinlock slow path using PV optimizations + which allow the hypervisor to 'idle' the guest on lock + contention. + xirc2ps_cs= [NET,PCMCIA] Format: ,,,,,[,[,[,]]] diff --git a/arch/x86/include/asm/qspinlock.h b/arch/x86/include/asm/qspinlock.h index 444d6fd..d86ab94 100644 --- a/arch/x86/include/asm/qspinlock.h +++ b/arch/x86/include/asm/qspinlock.h @@ -32,6 +32,7 @@ static __always_inline u32 queued_fetch_set_pending_acquire(struct qspinlock *lo extern void __pv_init_lock_hash(void); extern void __pv_queued_spin_lock_slowpath(struct qspinlock *lock, u32 val); extern void __raw_callee_save___pv_queued_spin_unlock(struct qspinlock *lock); +extern bool nopvspin; #define queued_spin_unlock queued_spin_unlock /** diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index e820568..481d879 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -831,16 +831,23 @@ __visible bool __kvm_vcpu_is_preempted(long cpu) */ void __init kvm_spinlock_init(void) { - /* Does host kernel support KVM_FEATURE_PV_UNHALT? */ - if (!kvm_para_has_feature(KVM_FEATURE_PV_UNHALT)) - return; - - if (kvm_para_has_hint(KVM_HINTS_REALTIME)) + /* + * Don't use the pvqspinlock code if no KVM_FEATURE_PV_UNHALT feature + * support, or there is REALTIME hints or only 1 vCPU. + */ + if (!kvm_para_has_feature(KVM_FEATURE_PV_UNHALT) || + kvm_para_has_hint(KVM_HINTS_REALTIME) || + num_possible_cpus() == 1) { + pr_info("PV spinlocks disabled\n"); return; + } - /* Don't use the pvqspinlock code if there is only 1 vCPU. */ - if (num_possible_cpus() == 1) + if (nopvspin) { + pr_info("PV spinlocks disabled forced by \"nopvspin\" parameter.\n"); + static_branch_disable(&virt_spin_lock_key); return; + } + pr_info("PV spinlocks enabled\n"); __pv_init_lock_hash(); pv_ops.lock.queued_spin_lock_slowpath = __pv_queued_spin_lock_slowpath; diff --git a/kernel/locking/qspinlock.c b/kernel/locking/qspinlock.c index 2473f10..75193d6 100644 --- a/kernel/locking/qspinlock.c +++ b/kernel/locking/qspinlock.c @@ -580,4 +580,11 @@ void queued_spin_lock_slowpath(struct qspinlock *lock, u32 val) #include "qspinlock_paravirt.h" #include "qspinlock.c" +bool nopvspin __initdata; +static __init int parse_nopvspin(char *arg) +{ + nopvspin = true; + return 0; +} +early_param("nopvspin", parse_nopvspin); #endif -- 1.8.3.1