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=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham 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 6A880C3A5A2 for ; Wed, 4 Sep 2019 02:10:15 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4461F21897 for ; Wed, 4 Sep 2019 02:10:15 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4461F21897 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:52688 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i5KkQ-00054g-9J for qemu-devel@archiver.kernel.org; Tue, 03 Sep 2019 22:10:14 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:39680) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i5Kjl-0004dm-9C for qemu-devel@nongnu.org; Tue, 03 Sep 2019 22:09:34 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1i5Kjj-0004Cl-Pg for qemu-devel@nongnu.org; Tue, 03 Sep 2019 22:09:32 -0400 Received: from mga09.intel.com ([134.134.136.24]:57871) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1i5Kjj-000497-I4 for qemu-devel@nongnu.org; Tue, 03 Sep 2019 22:09:31 -0400 X-Amp-Result: UNSCANNABLE X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 03 Sep 2019 19:09:24 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,465,1559545200"; d="scan'208";a="198911868" Received: from dpdk-virtio-tbie-2.sh.intel.com (HELO ___) ([10.67.104.71]) by fmsmga001.fm.intel.com with ESMTP; 03 Sep 2019 19:09:22 -0700 Date: Wed, 4 Sep 2019 10:06:55 +0800 From: Tiwei Bie To: Johannes Berg Message-ID: <20190904020655.GA30746@___> References: <20190903200422.11693-1-johannes@sipsolutions.net> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20190903200422.11693-1-johannes@sipsolutions.net> User-Agent: Mutt/1.9.4 (2018-02-28) X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 134.134.136.24 Subject: Re: [Qemu-devel] [PATCH v2] libvhost-user: fix SLAVE_SEND_FD handling X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?utf-8?Q?Marc-Andr=C3=A9?= Lureau , qemu-devel@nongnu.org, Johannes Berg , "Michael S . Tsirkin" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Tue, Sep 03, 2019 at 11:04:22PM +0300, Johannes Berg wrote: > From: Johannes Berg > > It doesn't look like this could possibly work properly since > VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD is defined to 10, but the > dev->protocol_features has a bitmap. I suppose the peer this > was tested with also supported VHOST_USER_PROTOCOL_F_LOG_SHMFD, > in which case the test would always be false, but nevertheless > the code seems wrong. Ooops.. I tested `tests/vhost-user-bridge -H`. But as you said it worked because VHOST_USER_PROTOCOL_F_LOG_SHMFD has been negotiated. Thanks for spotting this! > > Use has_feature() to fix this. > > Fixes: d84599f56c82 ("libvhost-user: support host notifier") Cc: qemu-stable@nongnu.org > Signed-off-by: Johannes Berg > --- > contrib/libvhost-user/libvhost-user.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/contrib/libvhost-user/libvhost-user.c b/contrib/libvhost-user/libvhost-user.c > index 6a02eaffc672..fcf4a8a00ed2 100644 > --- a/contrib/libvhost-user/libvhost-user.c > +++ b/contrib/libvhost-user/libvhost-user.c > @@ -1097,7 +1097,8 @@ bool vu_set_queue_host_notifier(VuDev *dev, VuVirtq *vq, int fd, > > vmsg.fd_num = fd_num; > > - if ((dev->protocol_features & VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD) == 0) { > + if (!has_feature(dev->protocol_features, > + VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD)) { We have both of has_feature() and vu_has_feature() called by other code in this file directly. Not sure which one is preferred.. Personally, I think vu_has_feature() might be better. Thanks! Tiwei > return false; > } > > -- > 2.23.0 >