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=-7.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=no 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 CE449C433DF for ; Sun, 12 Jul 2020 14:55:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B886C20722 for ; Sun, 12 Jul 2020 14:55:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729037AbgGLOzr (ORCPT ); Sun, 12 Jul 2020 10:55:47 -0400 Received: from mga07.intel.com ([134.134.136.100]:60123 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728826AbgGLOzr (ORCPT ); Sun, 12 Jul 2020 10:55:47 -0400 IronPort-SDR: yCrpzf0qMUXqg2i2NTUwpah9v1fYbVJJXuwmgZBB+q976M1ZmLSEr0Cc5ctEdpHNZ+LkqdQVyy 4WUcB7YsVGEA== X-IronPort-AV: E=McAfee;i="6000,8403,9680"; a="213353168" X-IronPort-AV: E=Sophos;i="5.75,344,1589266800"; d="scan'208";a="213353168" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Jul 2020 07:55:45 -0700 IronPort-SDR: gJUXCmTd5tVBqS1SWc31K3wrUNzDbB8JPFF94ZwPVZGGFmccLuA+fmw8xBgYMHJv5pZgTaYA7e ui5+SOPZuJUQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.75,343,1589266800"; d="scan'208";a="458977463" Received: from unknown (HELO localhost.localdomain.bj.intel.com) ([10.240.192.131]) by orsmga005.jf.intel.com with ESMTP; 12 Jul 2020 07:55:42 -0700 From: Zhu Lingshan To: mst@redhat.com, jasowang@redhat.com, alex.williamson@redhat.com, pbonzini@redhat.com, sean.j.christopherson@intel.com, wanpengli@tencent.com Cc: virtualization@lists.linux-foundation.org, kvm@vger.kernel.org, netdev@vger.kernel.org, dan.daly@intel.com, Zhu Lingshan Subject: [PATCH 0/7] *** IRQ offloading for vDPA *** Date: Sun, 12 Jul 2020 22:52:04 +0800 Message-Id: <1594565524-3394-1-git-send-email-lingshan.zhu@intel.com> X-Mailer: git-send-email 1.8.3.1 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hi All, This series intends to implement IRQ offloading for vhost_vdpa. By the feat of irq forwarding facilities like posted interrupt on X86, irq bypass can help deliver interrupts to vCPU directly. vDPA devices have dedicated hardware backends like VFIO pass-throughed devices. So it would be possible to setup irq offloading(irq bypass) for vDPA devices and gain performance improvements. In my testing, with this feature, we can save 0.1ms in a ping between two VFs on average. Zhu Lingshan (7): vhost: introduce vhost_call_ctx kvm/vfio: detect assigned device via irqbypass manager vhost_vdpa: implement IRQ offloading functions in vhost_vdpa vDPA: implement IRQ offloading helpers in vDPA core virtio_vdpa: init IRQ offloading function pointers to NULL. ifcvf: replace irq_request/free with helpers in vDPA core. irqbypass: do not start consumer or producer when failed to connect arch/x86/kvm/x86.c | 10 ++++-- drivers/vdpa/ifcvf/ifcvf_main.c | 11 +++--- drivers/vdpa/vdpa.c | 46 +++++++++++++++++++++++++ drivers/vhost/Kconfig | 1 + drivers/vhost/vdpa.c | 75 +++++++++++++++++++++++++++++++++++++++-- drivers/vhost/vhost.c | 22 ++++++++---- drivers/vhost/vhost.h | 9 ++++- drivers/virtio/virtio_vdpa.c | 2 ++ include/linux/vdpa.h | 11 ++++++ virt/kvm/vfio.c | 2 -- virt/lib/irqbypass.c | 16 +++++---- 11 files changed, 181 insertions(+), 24 deletions(-) -- 1.8.3.1