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 54722C04AB6 for ; Tue, 28 May 2019 07:56:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 20CC02075B for ; Tue, 28 May 2019 07:56:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="a7dq5luQ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727564AbfE1H4l (ORCPT ); Tue, 28 May 2019 03:56:41 -0400 Received: from mail-pl1-f194.google.com ([209.85.214.194]:46317 "EHLO mail-pl1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726203AbfE1H4k (ORCPT ); Tue, 28 May 2019 03:56:40 -0400 Received: by mail-pl1-f194.google.com with SMTP id bb3so378363plb.13; Tue, 28 May 2019 00:56:40 -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=gYEx0O9ga7gmezM3UNZfMFOuMaxOrET+sxlSycHSkpM=; b=a7dq5luQaniRgSsf0ayiW5h+fJUP4Vmxrwo6U6SNNBBFHwBpqUASrwsP+754vmwsED pcC9bV90BsjkcHWVpiZmMYOXDzIXd7UMk6NaKt4y1AyvdGj2M9V6fV9M7qdP9Ebbg1wv kXZs31+QMzqil0gT8AwFtEXGclS2P5x0qgMXIF/VeyG3UObSOMpACD8WdnvlyzOPWuhk eze1GIBRIEICPw5YoQ9UBSQN1Wx3y380llfWB7LZCec29Q/+UyAMtjhb/bL8mW6fwOMF y9R9ApRr7TVpyoDan0nm5r/CB5Wf74I5KWNTTTEohVynll7c9upaGdBlAjNj+HWcfD8U NTbQ== 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=gYEx0O9ga7gmezM3UNZfMFOuMaxOrET+sxlSycHSkpM=; b=VKR0cHHMWaNxCy1dteY2FX8y3TQiWg3nTb49KCch/rFdY5UB0l6dEtPAng6DEVGBvR LTamAoEv8DTe+dBdLh7SdrourXiUk7HUh0XZ9AxyAukxWhX+RL+xRMHHeQRK9q3JmMyW JEhpnULjs1VZXUxJBgQVXan66Fz9unaSifXPwyDZnlBOy+sjqF5EBXsQegtm2TnEKe4y GMUV3fOB76w4Ph8l8UPJJ08lLTPW0osSteS7aAQw570sbeAaYhoxP0Jqt1hCpmjvX/hk Mi/P0WuipnW7Cn0sj9WTNnlxOENZrsVea8j2u3Wk722Y3HBr1nuQpBo2tUUDfrYwWHy3 OkwQ== X-Gm-Message-State: APjAAAWcbRax2HRi54fIdPu18IoY7a+DCs/5ioP6LUlqciL7kNVyNzB/ SGZVDA9XJVH5Y6XBqWVzuVqSLAn2 X-Google-Smtp-Source: APXvYqwtJCydhoAd/g0sCuuMctnI6P+onxHmBK/HiXonWEV3tU9YsQwCts33jXs/ju9nbNwHFHEgFA== X-Received: by 2002:a17:902:2c43:: with SMTP id m61mr24654147plb.315.1559030199892; Tue, 28 May 2019 00:56:39 -0700 (PDT) Received: from localhost.localdomain ([203.205.141.123]) by smtp.googlemail.com with ESMTPSA id t64sm2906920pjb.0.2019.05.28.00.56.37 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 28 May 2019 00:56:39 -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 RESEND v2 0/3] KVM: Yield to IPI target if necessary Date: Tue, 28 May 2019 15:56:32 +0800 Message-Id: <1559030195-2872-1-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% performance 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 * make kvm_sched_yield static * change dest_id to unsinged long 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 | 26 ++++++++++++++++++++++++++ include/uapi/linux/kvm_para.h | 1 + 7 files changed, 66 insertions(+), 1 deletion(-) -- 2.7.4