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=-2.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable 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 6550BC04AB3 for ; Mon, 27 May 2019 10:34:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 34AFE2133F for ; Mon, 27 May 2019 10:34:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Hz80ASuu" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726876AbfE0KeV (ORCPT ); Mon, 27 May 2019 06:34:21 -0400 Received: from mail-pf1-f194.google.com ([209.85.210.194]:36483 "EHLO mail-pf1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725858AbfE0KeV (ORCPT ); Mon, 27 May 2019 06:34:21 -0400 Received: by mail-pf1-f194.google.com with SMTP id u22so2063454pfm.3; Mon, 27 May 2019 03:34:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id; bh=NoLVQOqkX2/xP4sl1L3zBVgnDBCRtPDlDvXK4A/wSw0=; b=Hz80ASuulIzUsmAXxBDgEwmE6kIrH72Q9Nyz5A4t9i4uzNu5jmimfsepbH9wTOaVtC wxdquwDZFExDZLfc7HvsY/8XaTto009s/Iab1uL1XtKMzcp9lfEb63zz4If1euuTPdUP dV/7ArdK0mabSOWspYqAvPA5k5Z639Qx3oa8oMwFvAQQTwFt4BLaRSP8WR7qxzTdgUfs tBZBItnBJw+eXdQ5kDVWev83iNnNevuhwWE70Kzs5KeGc9ywnVqebZffMklEFHVyxgrE LJu0xMlm6desZhSSfwBrbxY3y5G8eUXfb8m5k0svRV2cTrIDIQF0InumHrAsS8CkELi4 gQhw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=NoLVQOqkX2/xP4sl1L3zBVgnDBCRtPDlDvXK4A/wSw0=; b=ViqfpBt3qoQrOVJmEXjnUm3EzKEdg1XgLvv6JR0vyxGgg8+i84oJb0Ecusa+y4bEcZ QkfYvlG6/VwQG+SmG8iEB+oearDA9FN4hbHjwB/PhSODUD6uA07jd0kfzLlOviZFU6U4 6qe6CaSMpjm317Gnj0WBt8z+0m3K6Btwg6H2TvlavYrb+KQ3YeoA5FtTv84j/Aa6Bg6x kAcMgg9FNjWGpRan38XSv3GbTdmkH1B/euyiWicl01rtJ7tHI7pjtF+QiYECpCfYCBtO pJH+wCcqTFtVMTM34HYVrcnyf44o33BPF8YR5yTpP5WMsFCyV1kzsUwy2kShYsw0THEI DBVA== X-Gm-Message-State: APjAAAXctLT5DZNXN4yaFq97Bp++i/zft6tGGp39UyMWe4TnvHHBxHEp uH6WgKCMDwYr+UXTRAwJhmhP1D5t X-Google-Smtp-Source: APXvYqyzFty0rTKubxKCt9VPZyJo1IER2jjvbwoNWqBpCbAs/i+f5dV1ZTJJMdCNYU3TNH8X03SytA== X-Received: by 2002:a63:f44f:: with SMTP id p15mr124959274pgk.65.1558953260447; Mon, 27 May 2019 03:34:20 -0700 (PDT) Received: from localhost.localdomain ([203.205.141.123]) by smtp.googlemail.com with ESMTPSA id y16sm19216452pfo.133.2019.05.27.03.34.18 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 27 May 2019 03:34:19 -0700 (PDT) From: Wanpeng Li X-Google-Original-From: Wanpeng Li To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= Subject: [PATCH 0/3] KVM: Yield to IPI target if necessary Date: Mon, 27 May 2019 18:34:12 +0800 Message-Id: <1558953255-9432-1-git-send-email-wanpengli@tencent.com> X-Mailer: git-send-email 2.7.4 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org The idea is from Xen, when sending a call-function IPI-many to vCPUs, yield if any of the IPI target vCPUs was preempted. 17% performace increase of ebizzy benchmark can be observed in an over-subscribe environment. (w/ kvm-pv-tlb disabled, testing TLB flush call-function IPI-many since call-function is not easy to be trigged by userspace workload). Wanpeng Li (3): KVM: X86: Implement PV sched yield in linux guest KVM: X86: Implement PV sched yield hypercall KVM: X86: Expose PV_SCHED_YIELD CPUID feature bit to guest Documentation/virtual/kvm/cpuid.txt | 4 ++++ Documentation/virtual/kvm/hypercalls.txt | 11 +++++++++++ arch/x86/include/uapi/asm/kvm_para.h | 1 + arch/x86/kernel/kvm.c | 21 +++++++++++++++++++++ arch/x86/kvm/cpuid.c | 3 ++- arch/x86/kvm/x86.c | 17 +++++++++++++++++ include/uapi/linux/kvm_para.h | 1 + 7 files changed, 57 insertions(+), 1 deletion(-) -- 2.7.4