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=-2.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED,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 A0D0BC04ABB for ; Thu, 13 Sep 2018 09:37:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 65CE4206B8 for ; Thu, 13 Sep 2018 09:37:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 65CE4206B8 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727803AbeIMOqg (ORCPT ); Thu, 13 Sep 2018 10:46:36 -0400 Received: from mga01.intel.com ([192.55.52.88]:49361 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726751AbeIMOqg (ORCPT ); Thu, 13 Sep 2018 10:46:36 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 13 Sep 2018 02:37:55 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.53,368,1531810800"; d="scan'208";a="90093124" Received: from svm-s2600wft.bj.intel.com ([10.240.193.45]) by orsmga001.jf.intel.com with ESMTP; 13 Sep 2018 02:37:44 -0700 From: Yi Sun To: linux-kernel@vger.kernel.org Cc: x86@kernel.org, chao.p.peng@intel.com, chao.gao@intel.com, isaku.yamahata@intel.com, michael.h.kelly@microsoft.com, tianyu.lan@microsoft.com, Yi Sun , "K. Y. Srinivasan" , Haiyang Zhang , Stephen Hemminger , Jonathan Corbet Subject: [PATCH v1 0/3] Enable PV qspinlock for Hyper-V Date: Thu, 13 Sep 2018 17:13:22 +0800 Message-Id: <1536830005-37260-1-git-send-email-yi.y.sun@linux.intel.com> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch adds the necessary Hyper-V specific code to allow PV qspinlock work on Hyper-V. In wait callback function, read HV_X64_MSR_GUEST_IDLE MSR to trigger the guest's transition to the idle power state which can be exited by an IPI even if IF flag is disabled. Beside that, make HVCALL_NOTIFY_LONG_SPIN_WAIT hypervall to notify the hypervisor that the calling virtual processor is attempting to acquire a resource that is potentially held by another virtual processor within the same partition. This scheduling hint improves the scalability of partitions with more than one virtual processor. In kick callback function, just send platform IPI to make waiting vcpu exit idle state. In vcpu_is_preempted callback function, return false directly because Hyper-V does not provide such interface so far. Cc: "K. Y. Srinivasan" Cc: Haiyang Zhang Cc: Stephen Hemminger Cc: Jonathan Corbet Yi Sun (3): X86/Hyper-V: Add Guest IDLE MSR support locking/pvqspinlock, hv: Enable PV qspinlock for Hyper-V hv: add description for hv_nopvspin Documentation/admin-guide/kernel-parameters.txt | 5 ++ arch/x86/hyperv/Makefile | 2 +- arch/x86/hyperv/hv_spinlock.c | 99 +++++++++++++++++++++++++ arch/x86/include/asm/hyperv-tlfs.h | 5 ++ arch/x86/include/asm/mshyperv.h | 3 + arch/x86/kernel/smpboot.c | 2 + 6 files changed, 115 insertions(+), 1 deletion(-) create mode 100644 arch/x86/hyperv/hv_spinlock.c -- 1.9.1