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 16101C3A589 for ; Thu, 15 Aug 2019 13:03:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DAFA7206C1 for ; Thu, 15 Aug 2019 13:03:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732075AbfHONDK (ORCPT ); Thu, 15 Aug 2019 09:03:10 -0400 Received: from out30-130.freemail.mail.aliyun.com ([115.124.30.130]:37323 "EHLO out30-130.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730775AbfHONDJ (ORCPT ); Thu, 15 Aug 2019 09:03:09 -0400 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R171e4;CH=green;DM=||false|;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01f04446;MF=luoben@linux.alibaba.com;NM=1;PH=DS;RN=7;SR=0;TI=SMTPD_---0TZYQf.p_1565874181; Received: from localhost(mailfrom:luoben@linux.alibaba.com fp:SMTPD_---0TZYQf.p_1565874181) by smtp.aliyun-inc.com(127.0.0.1); Thu, 15 Aug 2019 21:03:06 +0800 From: Ben Luo To: tglx@linutronix.de, alex.williamson@redhat.com Cc: linux-kernel@vger.kernel.org, tao.ma@linux.alibaba.com, gerry@linux.alibaba.com, nanhai.zou@linux.alibaba.com, linyunsheng@huawei.com Subject: [PATCH v3 0/3] genirq/vfio: Introduce update_irq_devid and optimize VFIO irq ops Date: Thu, 15 Aug 2019 21:02:58 +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 adds more latency, but also increases the risk of losing interrupt, which may lead to a VM hung forever in waiting for IO completion This patchset solved the issue by: Patch 2 introduces update_irq_devid to only update dev_id of irqaction Patch 3 make use of update_irq_devid and optimize irq operations in VFIO changes from v2: - reformat to avoid quoted string split across lines and etc. changes from v1: - add Patch 1 to enhance error recovery etc. in free irq per tglx's comments - enhance error recovery code and debugging info in update_irq_devid - use __must_check in external referencing of update_irq_devid - use EXPORT_SYMBOL_GPL for update_irq_devid - reformat code of patch 3 for better readability Ben Luo (3): genirq: enhance error recovery code in free irq genirq: introduce update_irq_devid() vfio_pci: make use of update_irq_devid and optimize irq ops drivers/vfio/pci/vfio_pci_intrs.c | 101 +++++++++++++++++++++------------- include/linux/interrupt.h | 3 ++ kernel/irq/manage.c | 110 +++++++++++++++++++++++++++++++++----- 3 files changed, 164 insertions(+), 50 deletions(-) -- 1.8.3.1