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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT 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 A2C44C33CAA for ; Thu, 23 Jan 2020 08:21:40 +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 72C8724125 for ; Thu, 23 Jan 2020 08:21:40 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 72C8724125 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=sipsolutions.net Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:52924 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iuXkB-00083t-EE for qemu-devel@archiver.kernel.org; Thu, 23 Jan 2020 03:21:39 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:53338) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iuXfx-00020c-6A for qemu-devel@nongnu.org; Thu, 23 Jan 2020 03:17:18 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iuXfv-0005lX-Mq for qemu-devel@nongnu.org; Thu, 23 Jan 2020 03:17:17 -0500 Received: from s3.sipsolutions.net ([2a01:4f8:191:4433::2]:35498 helo=sipsolutions.net) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iuXfv-0005ix-EI for qemu-devel@nongnu.org; Thu, 23 Jan 2020 03:17:15 -0500 Received: by sipsolutions.net with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.93) (envelope-from ) id 1iuXft-00FGF5-Kq; Thu, 23 Jan 2020 09:17:13 +0100 From: Johannes Berg To: qemu-devel@nongnu.org Subject: [PATCH v5 4/6] libvhost-user: handle NOFD flag in call/kick/err better Date: Thu, 23 Jan 2020 09:17:06 +0100 Message-Id: <20200123081708.7817-5-johannes@sipsolutions.net> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200123081708.7817-1-johannes@sipsolutions.net> References: <20200123081708.7817-1-johannes@sipsolutions.net> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2a01:4f8:191:4433::2 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: Johannes Berg , mst@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Johannes Berg The code here is odd, for example will it print out invalid file descriptor numbers that were never sent in the message. Clean that up a bit so it's actually possible to implement a device that uses polling. Signed-off-by: Johannes Berg --- contrib/libvhost-user/libvhost-user.c | 24 ++++++++++++++++-------- 1 file changed, 16 insertions(+), 8 deletions(-) diff --git a/contrib/libvhost-user/libvhost-user.c b/contrib/libvhost-user/libvhost-user.c index 8cc3054fd510..34d08e2fc4be 100644 --- a/contrib/libvhost-user/libvhost-user.c +++ b/contrib/libvhost-user/libvhost-user.c @@ -920,6 +920,7 @@ static bool vu_check_queue_msg_file(VuDev *dev, VhostUserMsg *vmsg) { int index = vmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK; + bool nofd = vmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK; if (index >= dev->max_queues) { vmsg_close_fds(vmsg); @@ -927,8 +928,12 @@ vu_check_queue_msg_file(VuDev *dev, VhostUserMsg *vmsg) return false; } - if (vmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK || - vmsg->fd_num != 1) { + if (nofd) { + vmsg_close_fds(vmsg); + return true; + } + + if (vmsg->fd_num != 1) { vmsg_close_fds(vmsg); vu_panic(dev, "Invalid fds in request: %d", vmsg->request); return false; @@ -1025,6 +1030,7 @@ static bool vu_set_vring_kick_exec(VuDev *dev, VhostUserMsg *vmsg) { int index = vmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK; + bool nofd = vmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK; DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64); @@ -1038,8 +1044,8 @@ vu_set_vring_kick_exec(VuDev *dev, VhostUserMsg *vmsg) dev->vq[index].kick_fd = -1; } - dev->vq[index].kick_fd = vmsg->fds[0]; - DPRINT("Got kick_fd: %d for vq: %d\n", vmsg->fds[0], index); + dev->vq[index].kick_fd = nofd ? -1 : vmsg->fds[0]; + DPRINT("Got kick_fd: %d for vq: %d\n", dev->vq[index].kick_fd, index); dev->vq[index].started = true; if (dev->iface->queue_set_started) { @@ -1116,6 +1122,7 @@ static bool vu_set_vring_call_exec(VuDev *dev, VhostUserMsg *vmsg) { int index = vmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK; + bool nofd = vmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK; DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64); @@ -1128,14 +1135,14 @@ vu_set_vring_call_exec(VuDev *dev, VhostUserMsg *vmsg) dev->vq[index].call_fd = -1; } - dev->vq[index].call_fd = vmsg->fds[0]; + dev->vq[index].call_fd = nofd ? -1 : vmsg->fds[0]; /* in case of I/O hang after reconnecting */ - if (eventfd_write(vmsg->fds[0], 1)) { + if (dev->vq[index].call_fd != -1 && eventfd_write(vmsg->fds[0], 1)) { return -1; } - DPRINT("Got call_fd: %d for vq: %d\n", vmsg->fds[0], index); + DPRINT("Got call_fd: %d for vq: %d\n", dev->vq[index].call_fd, index); return false; } @@ -1144,6 +1151,7 @@ static bool vu_set_vring_err_exec(VuDev *dev, VhostUserMsg *vmsg) { int index = vmsg->payload.u64 & VHOST_USER_VRING_IDX_MASK; + bool nofd = vmsg->payload.u64 & VHOST_USER_VRING_NOFD_MASK; DPRINT("u64: 0x%016"PRIx64"\n", vmsg->payload.u64); @@ -1156,7 +1164,7 @@ vu_set_vring_err_exec(VuDev *dev, VhostUserMsg *vmsg) dev->vq[index].err_fd = -1; } - dev->vq[index].err_fd = vmsg->fds[0]; + dev->vq[index].err_fd = nofd ? -1 : vmsg->fds[0]; return false; } -- 2.24.1