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=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,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 9C214C0650F for ; Thu, 8 Aug 2019 12:06:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 72312208C3 for ; Thu, 8 Aug 2019 12:06:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729023AbfHHMGh (ORCPT ); Thu, 8 Aug 2019 08:06:37 -0400 Received: from out30-131.freemail.mail.aliyun.com ([115.124.30.131]:39621 "EHLO out30-131.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726156AbfHHMGh (ORCPT ); Thu, 8 Aug 2019 08:06:37 -0400 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R481e4;CH=green;DM=||false|;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01f04391;MF=luoben@linux.alibaba.com;NM=1;PH=DS;RN=5;SR=0;TI=SMTPD_---0TYxvm0-_1565265986; Received: from localhost(mailfrom:luoben@linux.alibaba.com fp:SMTPD_---0TYxvm0-_1565265986) by smtp.aliyun-inc.com(127.0.0.1); Thu, 08 Aug 2019 20:06:34 +0800 From: Ben Luo To: tglx@linutronix.de, alex.williamson@redhat.com, linux-kernel@vger.kernel.org Cc: tao.ma@linux.alibaba.com, gerry@linux.alibaba.com Subject: [PATCH 0/2] introduce update_irq_devid and optimize VFIO irq ops Date: Thu, 8 Aug 2019 20:07:30 +0800 Message-Id: X-Mailer: git-send-email 1.8.3.1 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently, VFIO takes a lot of free-then-request-irq actions whenever a VM (with device passthru via VFIO) sets irq affinity or mask/unmask irq. Those actions only change the cookie data of irqaction or even change nothing. The free-then-request-irq not only add more latency, but also increases the risk of losing interrupt, this may lead to a VM hung forever in waiting IO completion This patchset solved this issue by: patch 1 introduces update_irq_devid to only update dev_id of irqaction patch 2 make use of update_irq_devid and optimize irq operations in VFIO Ben Luo (2): genirq: introduce update_irq_devid() vfio_pci: make use of update_irq_devid and optimize irq ops drivers/vfio/pci/vfio_pci_intrs.c | 100 +++++++++++++++++++++++--------------- include/linux/interrupt.h | 3 ++ kernel/irq/manage.c | 74 ++++++++++++++++++++++++++++ 3 files changed, 139 insertions(+), 38 deletions(-) -- 1.8.3.1