From nobody Sun May 5 22:43:50 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1523040803259861.4681290586301; Fri, 6 Apr 2018 11:53:23 -0700 (PDT) Received: from localhost ([::1]:47382 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f4WU8-0001Rn-Ur for importer@patchew.org; Fri, 06 Apr 2018 14:53:16 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:37585) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f4WSm-0000ld-Od for qemu-devel@nongnu.org; Fri, 06 Apr 2018 14:51:53 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1f4WSj-0002ga-LD for qemu-devel@nongnu.org; Fri, 06 Apr 2018 14:51:52 -0400 Received: from mail-by2nam01on0061.outbound.protection.outlook.com ([104.47.34.61]:22880 helo=NAM01-BY2-obe.outbound.protection.outlook.com) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1f4WSj-0002fh-4b for qemu-devel@nongnu.org; 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20:wZDFnysInXeYi985NVfJ49esTqw+ZyU+4EvPX91PaBuN0Q6hUwhTl6wL5QvM9Y7UIMDOOigSN8TdGod10nroGmLouuIlTHSpIkZA2nP0xXlJESa9M0MhYxKNmAWZcz3vFfMU7mmOePqwW6GCjRo6ZsceknD3gWcqcC2pGhuppL9vD9xeLwNgbSGAo4u37E4amhX4Ll77Or2ORmdUSG0n1Q3PW1MubroXjeYNAMrblK6AfbeCa/DlpTnq4iRMkhJS X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Apr 2018 18:51:43.2131 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d1a67bef-f7b2-4df7-ca6b-08d59bef7101 X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM2PR12MB0153 X-detected-operating-system: by eggs.gnu.org: Windows 7 or 8 [fuzzy] X-Received-From: 104.47.34.61 Subject: [Qemu-devel] [PATCH v2 for-2.12] tap: set vhostfd passed from qemu cli to non-blocking X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Thomas.Lendacky@amd.com, Jason Wang , Brijesh Singh , "Michael S . Tsirkin" Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RDKM_2 RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" A guest boot hangs while probing the network interface when iommu_platform=3Don is used. The following qemu cli hangs without this patch: # $QEMU \ -netdev tap,fd=3D3,id=3Dhostnet0,vhost=3Don,vhostfd=3D4 3<>/dev/tap67 4<>= /dev/host-net \ -device virtio-net-pci,netdev=3Dhostnet0,id=3Dnet0,iommu_platform=3Don,di= sable-legacy=3Don \ ... Commit: c471ad0e9bd46 (vhost_net: device IOTLB support) took care of setting vhostfd to non-blocking when QEMU opens /dev/host-net but if the fd is passed from qemu cli then we need to ensure that fd is set to non-blocking. Fixes: c471ad0e9bd46 "vhost_net: device IOTLB support" Cc: Michael S. Tsirkin Cc: Jason Wang Signed-off-by: Brijesh Singh Reviewed-by: Michael S. Tsirkin --- Changes since v1: - use qemu_set_nonblock() instead of fcntl(..) net/tap.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/tap.c b/net/tap.c index 2b3a36f9b50d..89c4e19162a2 100644 --- a/net/tap.c +++ b/net/tap.c @@ -40,6 +40,7 @@ #include "qemu-common.h" #include "qemu/cutils.h" #include "qemu/error-report.h" +#include "qemu/sockets.h" =20 #include "net/tap.h" =20 @@ -693,6 +694,7 @@ static void net_init_tap_one(const NetdevTapOptions *ta= p, NetClientState *peer, } return; } + qemu_set_nonblock(vhostfd); } else { vhostfd =3D open("/dev/vhost-net", O_RDWR); if (vhostfd < 0) { --=20 2.14.3