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=-2.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,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 C8F7FC43141 for ; Fri, 29 Jun 2018 09:51:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 76F8127C44 for ; Fri, 29 Jun 2018 09:51:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="AP3LWUlW" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 76F8127C44 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.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 S934439AbeF2JvX (ORCPT ); Fri, 29 Jun 2018 05:51:23 -0400 Received: from mail-pl0-f67.google.com ([209.85.160.67]:34998 "EHLO mail-pl0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932288AbeF2JvW (ORCPT ); Fri, 29 Jun 2018 05:51:22 -0400 Received: by mail-pl0-f67.google.com with SMTP id k1-v6so4213024plt.2; Fri, 29 Jun 2018 02:51:21 -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:mime-version :content-transfer-encoding; bh=gzqBCyemS5Hh2v//fHumPlk1EpHJH6n9shOPGT7uypg=; b=AP3LWUlWgOlpyiizaorqvkyPV1yV+Eq6bvz0rtb/k9fTA75bxuyf/y02KmgIRhFFh1 BjOIcufUKD93t/Jy7oqXEqYat5Qx4MCTDOPuu/E575PQ4hCEkGQuzciNl++s9xRDeS2J 8G3663XMIkOOZ0AiVynsfeoVKeyUvl+CIhxGrcQnht5FRUPRMQ+IhErtop/KnJ4/i0w4 lYPZiSC19+UFNM34jNVL5Bd5HPCb1nhKqNbyyp1kIlCr5nQuL06xwR9iGsY93Y9bUBjT S57miAjDca0R6N7+sshd+OMEgzPw2DXJRQX3tLOddHKwShxJC8tHQBYxhW8yBNfIgSj0 Y49Q== 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:mime-version :content-transfer-encoding; bh=gzqBCyemS5Hh2v//fHumPlk1EpHJH6n9shOPGT7uypg=; b=VQX1+5YKYy4+jtiPSjHlRxnGxLWLuWqTnwr9XZqD41xg46nK+o7SoNJKM7P8LcImmd G3QWuwmehIAUJOtmegJeoI9KWE9tK+M5PqYGlMDRBHPhDLyRZB/BHc5/xg04qd2NtY13 i/sXDbchMbKNsPAXPnmkT2h5WVayNbO456gZoIrDwu+S72MH3IErruWusjW9GAI4Bwgv ydn3wSO9jcElmPfVqQSgUtA5z80hbgWopTreMWjQAMlAiLmxgCO6uZCv/jvdvNItQrsn rl3FfvH1OfljBHo/5m1KfvEb17x6hqsEiCDMMGCOVa+PH8qOeT3MVVrIP91WY1/09+iO IxMg== X-Gm-Message-State: APt69E0Q0nA2bc93xFop+sQ+VSoy8Khmhc1wK8VlaFmGCDjHGvs2PZ18 unypiAxFth6D2bB6XBRctwcoEA== X-Google-Smtp-Source: ADUXVKKg/ZeMdxu/fLm39ZpYYTjlEtO3ocEFtEPeD38q+cLpMR2YaYNCO9VhnX6NiDDEwGdv/7WLUA== X-Received: by 2002:a17:902:43a4:: with SMTP id j33-v6mr14173965pld.118.1530265881304; Fri, 29 Jun 2018 02:51:21 -0700 (PDT) Received: from localhost.localdomain ([203.205.141.123]) by smtp.googlemail.com with ESMTPSA id z19-v6sm16802066pfm.187.2018.06.29.02.51.19 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 29 Jun 2018 02:51:20 -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?= , Vitaly Kuznetsov Subject: [PATCH 0/2] KVM: x86: Add PV IPIs support Date: Fri, 29 Jun 2018 17:51:14 +0800 Message-Id: <1530265876-18136-1-git-send-email-wanpengli@tencent.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Using hypercall to send IPIs by one vmexit instead of one by one for xAPIC/x2APIC physical mode and one vmexit per-cluster for x2APIC cluster mode. Even if enable qemu interrupt remapping and PV TLB Shootdown, I can still observe ~14% performance boost by ebizzy benchmark for 64 vCPUs VM, the total msr-induced vmexits reduce ~70%. The patchset implements the PV IPIs for vCPUs <= 64 VM, this is really common in cloud environment, after this patchset is applied, I can continue to add > 64 vCPUs VM support and that implementation has to introduce more complex logic. Cc: Paolo Bonzini Cc: Radim Krčmář Cc: Vitaly Kuznetsov Wanpeng Li (2): KVM: X86: Implement PV IPI in linux guest KVM: X86: Implement PV send IPI support Documentation/virtual/kvm/cpuid.txt | 4 +++ arch/x86/include/uapi/asm/kvm_para.h | 1 + arch/x86/kernel/kvm.c | 63 ++++++++++++++++++++++++++++++++++++ arch/x86/kvm/cpuid.c | 3 +- arch/x86/kvm/x86.c | 25 ++++++++++++++ include/uapi/linux/kvm_para.h | 1 + 6 files changed, 96 insertions(+), 1 deletion(-) -- 2.7.4