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=-9.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, 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 87EC5C433DF for ; Wed, 10 Jun 2020 04:51:18 +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 4FD202072E for ; Wed, 10 Jun 2020 04:51:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Dcr5Ria/" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4FD202072E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:57124 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jishp-0007aL-IC for qemu-devel@archiver.kernel.org; Wed, 10 Jun 2020 00:51:17 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:34248) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jisLh-0001fS-I7 for qemu-devel@nongnu.org; Wed, 10 Jun 2020 00:28:25 -0400 Received: from us-smtp-1.mimecast.com ([207.211.31.81]:26121 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1jisLg-0008Mz-IX for qemu-devel@nongnu.org; Wed, 10 Jun 2020 00:28:25 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1591763303; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=kF29j1OTXstILIv0rMUhyWfGCjzS5Fq6k2w7s6M2f5A=; b=Dcr5Ria/4KgoQ8A4I3oe62zu+vn9R9ScSqvmpAs59nAyWnx34gxsI3aOsQ3o4O+BInZEmN teEhUJ8NJwcfj49/R+87sVKi6rzwc/FPMNjFUD9tdRhcz8iUapAAqmW2Zc2N4zmgwqJFdG x/UOJge1An6p5sjC8u69GvFCrN5HOsA= Received: from mail-wr1-f70.google.com (mail-wr1-f70.google.com [209.85.221.70]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-329-hbDllxHJNlC_z9ZZxxHIJg-1; Wed, 10 Jun 2020 00:28:20 -0400 X-MC-Unique: hbDllxHJNlC_z9ZZxxHIJg-1 Received: by mail-wr1-f70.google.com with SMTP id s17so510332wrt.7 for ; Tue, 09 Jun 2020 21:28:20 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:content-transfer-encoding :in-reply-to; bh=kF29j1OTXstILIv0rMUhyWfGCjzS5Fq6k2w7s6M2f5A=; b=s3ZmrJQJIKpx5Q6sAkJ8IvOhCTXHfZ2Bfdy8/UzVS/mbGBoaCOh7AhhUE67vRaNPID yhrZ5IJ+XwLV4pXfVHctXTknzi3qnGUpdLGaXuVpPSO3UxkdGCxtsylEgkVWF4ahIJ3l KlB5upyftHALSfZzM18sSihaJH88ytwqb46VB9/r5/nn3TVALOyhpyeZg54A199YEeqA rpd6lnpVyDVWDNjZC2HBjOKZ0y6PTCE9tnYuLqBK19Mcw1vnQzJnutsXEp4jT5V9XjPZ TVcHUgVvjsoe5LRq/0qQWDFNkYbpMtG2Dqy+QuNLr77a6VG/XYsKyuy+4sAy3OzFz6MY 7j1w== X-Gm-Message-State: AOAM530chejK5BBThXN10iaWZqE6cM9NhPA+koZLe1VjdQZvuEPrWbqA X4avkTPjcP16oQRZMJSo1QCngKEgoA6Z/mwzImQHjvW1Q7SxTolpwtpWPmnArZXa3k+x6qsrZPJ EVGPeEKZ2G76yVPM= X-Received: by 2002:adf:fec8:: with SMTP id q8mr1403757wrs.2.1591763299420; Tue, 09 Jun 2020 21:28:19 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyuWUNdJPmvwpY1lC4BaLcP+xBRe7LzeYyXbmI3ke37sxssnnG0zaSwqsWjQkHTdLh3bRQDlg== X-Received: by 2002:adf:fec8:: with SMTP id q8mr1403735wrs.2.1591763299251; Tue, 09 Jun 2020 21:28:19 -0700 (PDT) Received: from redhat.com (bzq-79-181-55-232.red.bezeqint.net. [79.181.55.232]) by smtp.gmail.com with ESMTPSA id o20sm6345357wra.29.2020.06.09.21.28.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 Jun 2020 21:28:18 -0700 (PDT) Date: Wed, 10 Jun 2020 00:28:16 -0400 From: "Michael S. Tsirkin" To: qemu-devel@nongnu.org Subject: [PULL 46/56] libvhost-user: advertise vring features Message-ID: <20200610042613.1459309-47-mst@redhat.com> References: <20200610042613.1459309-1-mst@redhat.com> MIME-Version: 1.0 In-Reply-To: <20200610042613.1459309-1-mst@redhat.com> X-Mailer: git-send-email 2.24.1.751.gd10ce2899c X-Mutt-Fcc: =sent X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Content-Disposition: inline Received-SPF: pass client-ip=207.211.31.81; envelope-from=mst@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/09 23:22:15 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action 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: Peter Maydell , Jason Wang , Raphael Norwitz , Stefan Hajnoczi , =?utf-8?Q?Marc-Andr=C3=A9?= Lureau Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Stefan Hajnoczi libvhost-user implements several vring features without advertising them. There is no way for the vhost-user master to detect support for these features. Things more or less work today because QEMU assumes the vhost-user backend always implements certain feature bits like VIRTIO_RING_F_EVENT_IDX. This is not documented anywhere. This patch explicitly advertises features implemented in libvhost-user so that the vhost-user master does not need to make undocumented assumptions. Feature bits that libvhost-user now advertises can be removed from vhost-user-blk.c. Devices should not be responsible for advertising vring feature bits, that is libvhost-user's job. Cc: Marc-André Lureau Cc: Jason Wang Cc: Michael S. Tsirkin Signed-off-by: Stefan Hajnoczi Message-Id: <20200529161338.456017-1-stefanha@redhat.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin Reviewed-by: Marc-André Lureau --- contrib/libvhost-user/libvhost-user.c | 10 ++++++++++ contrib/vhost-user-blk/vhost-user-blk.c | 4 +--- 2 files changed, 11 insertions(+), 3 deletions(-) diff --git a/contrib/libvhost-user/libvhost-user.c b/contrib/libvhost-user/libvhost-user.c index b1e607298c..d315db1396 100644 --- a/contrib/libvhost-user/libvhost-user.c +++ b/contrib/libvhost-user/libvhost-user.c @@ -498,6 +498,16 @@ static bool vu_get_features_exec(VuDev *dev, VhostUserMsg *vmsg) { vmsg->payload.u64 = + /* + * The following VIRTIO feature bits are supported by our virtqueue + * implementation: + */ + 1ULL << VIRTIO_F_NOTIFY_ON_EMPTY | + 1ULL << VIRTIO_RING_F_INDIRECT_DESC | + 1ULL << VIRTIO_RING_F_EVENT_IDX | + 1ULL << VIRTIO_F_VERSION_1 | + + /* vhost-user feature bits */ 1ULL << VHOST_F_LOG_ALL | 1ULL << VHOST_USER_F_PROTOCOL_FEATURES; diff --git a/contrib/vhost-user-blk/vhost-user-blk.c b/contrib/vhost-user-blk/vhost-user-blk.c index 6fd91c7e99..25eccd02b5 100644 --- a/contrib/vhost-user-blk/vhost-user-blk.c +++ b/contrib/vhost-user-blk/vhost-user-blk.c @@ -382,9 +382,7 @@ vub_get_features(VuDev *dev) 1ull << VIRTIO_BLK_F_DISCARD | 1ull << VIRTIO_BLK_F_WRITE_ZEROES | #endif - 1ull << VIRTIO_BLK_F_CONFIG_WCE | - 1ull << VIRTIO_F_VERSION_1 | - 1ull << VHOST_USER_F_PROTOCOL_FEATURES; + 1ull << VIRTIO_BLK_F_CONFIG_WCE; if (vdev_blk->enable_ro) { features |= 1ull << VIRTIO_BLK_F_RO; -- MST