From patchwork Tue Mar 15 01:35:48 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cao jin X-Patchwork-Id: 8584661 Return-Path: X-Original-To: patchwork-qemu-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id F2FBB9F3D1 for ; Tue, 15 Mar 2016 01:36:40 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 53B152027D for ; Tue, 15 Mar 2016 01:36:40 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 90D5920270 for ; Tue, 15 Mar 2016 01:36:39 +0000 (UTC) Received: from localhost ([::1]:44902 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1afduY-0003xF-VK for patchwork-qemu-devel@patchwork.kernel.org; Mon, 14 Mar 2016 21:36:38 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:60688) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1afdsi-0000ji-IF for qemu-devel@nongnu.org; Mon, 14 Mar 2016 21:34:45 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1afdsh-0002oE-Fk for qemu-devel@nongnu.org; Mon, 14 Mar 2016 21:34:44 -0400 Received: from [59.151.112.132] (port=17158 helo=heian.cn.fujitsu.com) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1afdsh-0002l7-3S for qemu-devel@nongnu.org; Mon, 14 Mar 2016 21:34:43 -0400 X-IronPort-AV: E=Sophos;i="5.22,518,1449504000"; d="scan'208";a="4571668" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 15 Mar 2016 09:34:42 +0800 Received: from G08CNEXCHPEKD01.g08.fujitsu.local (unknown [10.167.33.80]) by cn.fujitsu.com (Postfix) with ESMTP id 9021C42B4B10; Tue, 15 Mar 2016 09:34:40 +0800 (CST) Received: from G08FNSTD140223.g08.fujitsu.local (10.167.226.69) by G08CNEXCHPEKD01.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server (TLS) id 14.3.181.6; Tue, 15 Mar 2016 09:34:40 +0800 From: Cao jin To: Date: Tue, 15 Mar 2016 09:35:48 +0800 Message-ID: <1458005749-4878-9-git-send-email-caoj.fnst@cn.fujitsu.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1458005749-4878-1-git-send-email-caoj.fnst@cn.fujitsu.com> References: <1458005749-4878-1-git-send-email-caoj.fnst@cn.fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.226.69] X-yoursite-MailScanner-ID: 9021C42B4B10.A68CE X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: caoj.fnst@cn.fujitsu.com X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 59.151.112.132 Cc: chen.fan.fnst@cn.fujitsu.com, izumi.taku@jp.fujitsu.com, alex.williamson@redhat.com, mst@redhat.com Subject: [Qemu-devel] [patch v3 8/9] vfio-pci: pass the aer error to guest X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Chen Fan when the vfio device encounters an uncorrectable error in host, the vfio_pci driver will signal the eventfd registered by this vfio device, resulting in the qemu eventfd handler getting invoked. this patch is to pass the error to guest and let the guest driver recover from the error. Signed-off-by: Chen Fan --- hw/vfio/pci.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 49 insertions(+), 7 deletions(-) diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index b944d0b..6a7bb47 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -2590,22 +2590,64 @@ static void vfio_put_device(VFIOPCIDevice *vdev) static void vfio_err_notifier_handler(void *opaque) { VFIOPCIDevice *vdev = opaque; + PCIDevice *dev = &vdev->pdev; + Error *local_err = NULL; + PCIEAERMsg msg = { + .severity = 0, + .source_id = (pci_bus_num(dev->bus) << 8) | dev->devfn, + }; if (!event_notifier_test_and_clear(&vdev->err_notifier)) { return; } - if ((vdev->features & VFIO_FEATURE_ENABLE_AER)) { + /* + * in case the real hardware configuration has been changed, + * here we should recheck the bus reset capability. + */ + if (vdev->features & VFIO_FEATURE_ENABLE_AER) { + vfio_check_hot_bus_reset(vdev, &local_err); + if (local_err) { + error_report_err(local_err); + goto stop; + } vdev->pdev.bus->is_bus_rst = true; + + /* + * we should read the error details from the real hardware + * configuration spaces, here we only need to do is signaling + * to guest an uncorrectable error has occurred. + */ + if (dev->exp.aer_cap) { + uint8_t *aer_cap = dev->config + dev->exp.aer_cap; + uint32_t uncor_status; + bool isfatal; + + uncor_status = vfio_pci_read_config(dev, + dev->exp.aer_cap + PCI_ERR_UNCOR_STATUS, 4); + + /* + * if the error is not emitted by this device, we can + * just ignore it. + */ + if (!(uncor_status & ~0UL)) { + return; + } + + isfatal = uncor_status & pci_get_long(aer_cap + PCI_ERR_UNCOR_SEVER); + + msg.severity = isfatal ? PCI_ERR_ROOT_CMD_FATAL_EN : + PCI_ERR_ROOT_CMD_NONFATAL_EN; + + pcie_aer_msg(dev, &msg); + return; + } } +stop: /* - * TBD. Retrieve the error details and decide what action - * needs to be taken. One of the actions could be to pass - * the error to the guest and have the guest driver recover - * from the error. This requires that PCIe capabilities be - * exposed to the guest. For now, we just terminate the - * guest to contain the error. + * If the aer capability is not exposed to the guest. we just + * terminate the guest to contain the error. */ error_report("%s(%04x:%02x:%02x.%x) Unrecoverable error detected. "