From patchwork Tue May 28 07:50:54 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wanpeng Li X-Patchwork-Id: 10964049 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D9E0814C0 for ; Tue, 28 May 2019 07:51:37 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CEAE12625B for ; Tue, 28 May 2019 07:51:37 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C36A428738; Tue, 28 May 2019 07:51:37 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7B55127EED for ; Tue, 28 May 2019 07:51:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726910AbfE1HvL (ORCPT ); Tue, 28 May 2019 03:51:11 -0400 Received: from mail-pf1-f195.google.com ([209.85.210.195]:40362 "EHLO mail-pf1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726203AbfE1HvK (ORCPT ); Tue, 28 May 2019 03:51:10 -0400 Received: by mail-pf1-f195.google.com with SMTP id u17so10960002pfn.7; Tue, 28 May 2019 00:51:10 -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:in-reply-to:references; bh=gYEx0O9ga7gmezM3UNZfMFOuMaxOrET+sxlSycHSkpM=; b=Spvfdfdf5+Hi2ME1dkkbMVU8kp4BoweT58Z1VEE9RMlUgy8GpnZD+AUdy5k3qvw8ym gIy4ALuQ5dY+KnR6zwSy5ch77NxR/ksaw/yLMJHWimaS2BZ6O96vVQQYDh8jBdHCUH/4 as9FjWWRyM4L4aKAexJG4dburCrm34tOvrhAakfzJkLGs30ACmoHl1nSPnI3dq4FX/Ax 6r+aGBs0ir/gjSAZJWw7MHkHK+hwDQekbYudbKDvCjlDXVk0L5Cq1G6jknYbE0GLSBfN 6OCx6w0tVYPMjBl4YgVddiF4L5JHloBhpKjczFSNmbhzgupE2r2mHedu50fTIgK4cTdQ 0tUQ== 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:in-reply-to :references; bh=gYEx0O9ga7gmezM3UNZfMFOuMaxOrET+sxlSycHSkpM=; b=j6oFoSKwMlY1TmdIlxjE/vEamkF8xWu9GGNWTvOC78EMYJ5dIRd5G3CyJgGL6i2EDN Kv6VN7hcs8Xfkqx+TSLr5jZbXp95FfyNkDC6znMMS+RGDJUWjmieuCTf71oKlPxzltFR 2ysevLUaB7ozYCCmML98k4Dm2sDvfTbGyaJQN1VJnJvHmt6ESPWF5jJSko2TnUkMbV7X RWUA5m9PEDYI6bwHePcrK0uVxoe2BlIbchAVQGBgRhb8hGkjPPRVEGDgPxGS/P9yMAFq HieWt7y1HRaZW1lOC6uOhRVUGzh9x7ftq6GOCrQetQIbHUizAr5wAJhDk/lKtjmD4p8i y+hw== X-Gm-Message-State: APjAAAXUsE9pNNMbzBJG272CCtFJnWfYlC8CNpmRDSUVi8w3Z7eqy7XD smWlfeQ5BWpebywNPMwSDgJqgMJc X-Google-Smtp-Source: APXvYqwj+NMpZ1s2uvQ6p3HZ/6VzNBEgzCObP3JqgJ8XjZRHDT3HlFY5f5ns5FEetoV9q50P8zcIdg== X-Received: by 2002:aa7:951c:: with SMTP id b28mr120419717pfp.99.1559029869814; Tue, 28 May 2019 00:51:09 -0700 (PDT) Received: from localhost.localdomain ([203.205.141.123]) by smtp.googlemail.com with ESMTPSA id q20sm18201400pgq.66.2019.05.28.00.51.08 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 28 May 2019 00:51:09 -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?b?UmFkaW0gS3LEjW3DocWZ?= Subject: [PATCH RESEND v2 0/3] KVM: Yield to IPI target if necessary Date: Tue, 28 May 2019 15:50:54 +0800 Message-Id: <1559029857-2750-1-git-send-email-wanpengli@tencent.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1559004795-19927-3-git-send-email-wanpengli@tencent.com> References: <1559004795-19927-3-git-send-email-wanpengli@tencent.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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(-)