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=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 1031DC04AB3 for ; Tue, 28 May 2019 00:53:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CDE7A20717 for ; Tue, 28 May 2019 00:53:22 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="aQ7QryN9" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727636AbfE1AxW (ORCPT ); Mon, 27 May 2019 20:53:22 -0400 Received: from mail-pf1-f195.google.com ([209.85.210.195]:39224 "EHLO mail-pf1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727090AbfE1AxV (ORCPT ); Mon, 27 May 2019 20:53:21 -0400 Received: by mail-pf1-f195.google.com with SMTP id z26so10363896pfg.6; Mon, 27 May 2019 17:53:21 -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; bh=9R1WAZubBwPCR81iFE++dlM75mJQ0BWis768i1AheyQ=; b=aQ7QryN98mFHPQd87mss4e5b3vsnVABZEwQBVz80fGJxQYJe2RLCAzUVnHay3gzm7B ezZC6l/EkEBUX83OmRhFdKR6qBX1qJ9GxkIK8Ooea2exUt11TGoAwIpvK7zAv0M2tH5v QYBPEZhkdy+WerGDjwGqwhxsgkUGuP+WgGCalyi6gfRlkDmM+W2j+Qm9vrcCHMIj01Qh j5qHn6wBg0cEjJLaanbRWU6Z+moKdlJNNtWKNdeRcI2GM9p15zdXjfHdoMmqD5BsRYq3 hSyJjySIreFJ9fqGHRsy6KORXdi5nHpG6HTl5mYxDgRO7ZL7H1hNZhP00QhiwQfuvDX1 e1pg== 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=9R1WAZubBwPCR81iFE++dlM75mJQ0BWis768i1AheyQ=; b=ViuxJDHKvm+UzKfwCDDtqofyDPx5/CUhnq2Y32oo+saYizghi8g0FoYHrIDIBZgAe4 vWAMSZ29y24LEYZLW9WWQa4773eB7wTtNZvV5vUYwrOX4E+JxrY/mdsc9Ai/j+FYSruW 0CuolrEvFI/X/K510p/geUBTvtc++pEaOTCvtb4n+/GsijVJSpN3zW25liSJ8gxlMPnJ W71CMHKfUGwu1E7uUNcLZqfYHgMiW0AObIaHBh/JEbAvEVy0sZleXPeAvC5u2GFhIhDe rv/7j3awhLdgzOy5pLh1SnW6s2QU12051OPTb3j7asgTkF0Y+GdwXbZKv/RohwhBJ1w9 4ZGA== X-Gm-Message-State: APjAAAU3MjKNxD9m6Su6j0z8E5YWXqO4I6hnXBb5AXede/pU14B5GzhE IW4AeRSwBjwHXyycbDhAQwQ53Hdz X-Google-Smtp-Source: APXvYqyb0nsoOviH5wvyfq9oN1H84zgp8otgAU7tkS+7IAShLo6aJ1WjP8ntxlYdPJc1JenYbnqn+g== X-Received: by 2002:a65:41c6:: with SMTP id b6mr63469503pgq.399.1559004800890; Mon, 27 May 2019 17:53:20 -0700 (PDT) Received: from localhost.localdomain ([203.205.141.123]) by smtp.googlemail.com with ESMTPSA id f16sm622085pja.18.2019.05.27.17.53.19 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 27 May 2019 17:53:20 -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?= Subject: [PATCH v2 0/3] KVM: Yield to IPI target if necessary Date: Tue, 28 May 2019 08:53:12 +0800 Message-Id: <1559004795-19927-1-git-send-email-wanpengli@tencent.com> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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). v1 -> v2: * check map is not NULL * check map->phys_map[dest_id] is not NULL 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 | 24 ++++++++++++++++++++++++ include/uapi/linux/kvm_para.h | 1 + 7 files changed, 64 insertions(+), 1 deletion(-) -- 2.7.4