From nobody Tue May 14 11:02:03 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1696278796; cv=none; d=zohomail.com; s=zohoarc; b=nLxn5JoGRShBRWMA1BxgkRh7JbzdCA4Vj/SrXEmMRiIwOJooOR1TPtvN18r+b5SltQ5vAJGTC2NkbqaaHCtsiGd9hppDT/k+MSfQcnwoxbVaoAHuaolIqCOZDUSVuV0jmNYkxORPK/dEthqoXEITOjwP+Kz3f09QgDGTWNk85D4= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1696278796; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=pwvwpkoDfTuCdbHLtY16MYrayNtLF7t2fUvSLSzfpps=; b=P6NLCqF3ci0Jau0pOW+j2SVXBzZSd3CP36DpuWTfHavdXvReXn4ru/uJcaEYbIfiqzY8SEGvOHqAi4unrqm+DU0iBF3deBKWlUPR20eAuz6jRC+/xRV+FBNhPwYLNE0QteDw3G8SSIATHL/XoDng88U/CptiplFQbOzUHhDqPiM= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1696278796681758.9414387810432; Mon, 2 Oct 2023 13:33:16 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qnPaq-0003RE-01; Mon, 02 Oct 2023 16:32:40 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qnPap-0003R4-Ah for qemu-devel@nongnu.org; Mon, 02 Oct 2023 16:32:39 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qnPan-0001TZ-O3 for qemu-devel@nongnu.org; Mon, 02 Oct 2023 16:32:39 -0400 Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-690-TMrYZ7gZNmq3S6Dsl_cNMQ-1; Mon, 02 Oct 2023 16:32:33 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id CDAA58039C1; Mon, 2 Oct 2023 20:32:32 +0000 (UTC) Received: from lacos-laptop-9.usersys.redhat.com (unknown [10.39.192.119]) by smtp.corp.redhat.com (Postfix) with ESMTP id 71C8F40C6EBF; Mon, 2 Oct 2023 20:32:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1696278756; 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=pwvwpkoDfTuCdbHLtY16MYrayNtLF7t2fUvSLSzfpps=; b=EImdstremRlW/51HZmIHLCGd4CZbML6r+pQC//rw6SCQIeGYNBW+r+78LmJSSiHblfDnQF +oOqJPVPHtCacGr9EmVNyM7wWNxi8c4VDSsh+KYyY9hohjm8E60L9LtfW3stAIlmw22ghl UcNeWKtPPIvLU0arHe3+ZggEYYkKBo4= X-MC-Unique: TMrYZ7gZNmq3S6Dsl_cNMQ-1 From: Laszlo Ersek To: qemu-devel@nongnu.org, lersek@redhat.com Cc: "Michael S. Tsirkin" , Eugenio Perez Martin , German Maglione , Liu Jiang , Sergio Lopez Pascual , Stefano Garzarella Subject: [PATCH v3 1/7] vhost-user: strip superfluous whitespace Date: Mon, 2 Oct 2023 22:32:15 +0200 Message-Id: <20231002203221.17241-2-lersek@redhat.com> In-Reply-To: <20231002203221.17241-1-lersek@redhat.com> References: <20231002203221.17241-1-lersek@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=lersek@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1696278798561100007 Content-Type: text/plain; charset="utf-8" Cc: "Michael S. Tsirkin" (supporter:vhost) Cc: Eugenio Perez Martin Cc: German Maglione Cc: Liu Jiang Cc: Sergio Lopez Pascual Cc: Stefano Garzarella Signed-off-by: Laszlo Ersek Reviewed-by: Stefano Garzarella Reviewed-by: Philippe Mathieu-Daud=C3=A9 Tested-by: Albert Esteve Reviewed-by: Eugenio P=C3=A9rez --- Notes: v3: =20 - pick up R-b from Phil and Eugenio, T-b from Albert =20 v2: =20 - pick up Stefano's R-b hw/virtio/vhost-user.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index 8dcf049d422b..b4b677c1ce66 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -398,7 +398,7 @@ static int vhost_user_write(struct vhost_dev *dev, Vhos= tUserMsg *msg, * operations such as configuring device memory mappings or issuing de= vice * resets, which affect the whole device instead of individual VQs, * vhost-user messages should only be sent once. - *=20 + * * Devices with multiple vhost_devs are given an associated dev->vq_in= dex * so per_device requests are only sent if vq_index is 0. */ From nobody Tue May 14 11:02:03 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1696278796; cv=none; d=zohomail.com; s=zohoarc; b=IpM1MWJZ4r1j+R2fMtSM1SEtgg48BvEWnAUIYvqhg0EbkUehtodpnv/7DVtWnmhccdJLrlfr7mgIZVFBKR2zeyUTnKoUNscCBoYnoE1wjFgaOuWgRK4B3fbP3ghTZ8O4NusBJS54NTwqGaQp3NlW+0UNkukWbcSQBqu+m20paIQ= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1696278796; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=oPlUXdWDD8QMGFhhfKJKaN+UnyyBcBbz9z4WzRK/Ayo=; b=m4kuYDjGPQFsM0OKqp4KEUO1tr6pr2hyoU/ajq50PkC25hL6Wbs3nH9sVKYQVO0dm0nSnHOzWGJPnjPR3GJPotaeKJTa8+0bVzhZCgnLAkDhYjrONYRIboZp4R9CnJ1GNmH3rnljfVBi4IexF9bHMqL6LFBhG/1keu9RDwLQ3B8= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1696278796589824.4177725638161; Mon, 2 Oct 2023 13:33:16 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qnPax-0003Tn-TG; Mon, 02 Oct 2023 16:32:47 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qnPaw-0003TA-8Z for qemu-devel@nongnu.org; Mon, 02 Oct 2023 16:32:46 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qnPau-0001Ua-A6 for qemu-devel@nongnu.org; Mon, 02 Oct 2023 16:32:46 -0400 Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-563-il5OPeoSNNOlfDq0ztJjkQ-1; Mon, 02 Oct 2023 16:32:35 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 30F258015AB; Mon, 2 Oct 2023 20:32:35 +0000 (UTC) Received: from lacos-laptop-9.usersys.redhat.com (unknown [10.39.192.119]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3847B40C6EBF; Mon, 2 Oct 2023 20:32:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1696278762; 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=oPlUXdWDD8QMGFhhfKJKaN+UnyyBcBbz9z4WzRK/Ayo=; b=GDiXEEBhzk1PgAMs2cXLvRLeoWOx6QXaFNMz9bHFGe2u0cp0+gy5FiD1JyBwMoRVDPIIUA o0AoNbmwH1d1QWkDiGRM11n8FK0blp2K7a648qfbUCAjOaJlGlvUxcbet+/BXU8JrAwcWM a1Y+8xN96q20BxmmOe9uvdcIU9xVbnI= X-MC-Unique: il5OPeoSNNOlfDq0ztJjkQ-1 From: Laszlo Ersek To: qemu-devel@nongnu.org, lersek@redhat.com Cc: "Michael S. Tsirkin" , Eugenio Perez Martin , German Maglione , Liu Jiang , Sergio Lopez Pascual , Stefano Garzarella Subject: [PATCH v3 2/7] vhost-user: tighten "reply_supported" scope in "set_vring_addr" Date: Mon, 2 Oct 2023 22:32:16 +0200 Message-Id: <20231002203221.17241-3-lersek@redhat.com> In-Reply-To: <20231002203221.17241-1-lersek@redhat.com> References: <20231002203221.17241-1-lersek@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=lersek@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1696278798216100005 Content-Type: text/plain; charset="utf-8" In the vhost_user_set_vring_addr() function, we calculate "reply_supported" unconditionally, even though we'll only need it if "wait_for_reply" is also true. Restrict the scope of "reply_supported" to the minimum. This is purely refactoring -- no observable change. Cc: "Michael S. Tsirkin" (supporter:vhost) Cc: Eugenio Perez Martin Cc: German Maglione Cc: Liu Jiang Cc: Sergio Lopez Pascual Cc: Stefano Garzarella Signed-off-by: Laszlo Ersek Reviewed-by: Stefano Garzarella Tested-by: Albert Esteve Reviewed-by: Philippe Mathieu-Daud=C3=A9 Reviewed-by: Eugenio P=C3=A9rez --- Notes: v3: =20 - pick up R-b from Phil and Eugenio, T-b from Albert =20 v2: =20 - pick up Stefano's R-b hw/virtio/vhost-user.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index b4b677c1ce66..64eac317bfb2 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -1331,17 +1331,18 @@ static int vhost_user_set_vring_addr(struct vhost_d= ev *dev, .hdr.size =3D sizeof(msg.payload.addr), }; =20 - bool reply_supported =3D virtio_has_feature(dev->protocol_features, - VHOST_USER_PROTOCOL_F_REPLY_= ACK); - /* * wait for a reply if logging is enabled to make sure * backend is actually logging changes */ bool wait_for_reply =3D addr->flags & (1 << VHOST_VRING_F_LOG); =20 - if (reply_supported && wait_for_reply) { - msg.hdr.flags |=3D VHOST_USER_NEED_REPLY_MASK; + if (wait_for_reply) { + bool reply_supported =3D virtio_has_feature(dev->protocol_features, + VHOST_USER_PROTOCOL_F_REPLY_ACK); + if (reply_supported) { + msg.hdr.flags |=3D VHOST_USER_NEED_REPLY_MASK; + } } =20 ret =3D vhost_user_write(dev, &msg, NULL, 0); From nobody Tue May 14 11:02:03 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1696278880; cv=none; d=zohomail.com; s=zohoarc; b=dyNwYC7ZMDivPA5DPg+ulgWb3w+uGnLO/PClkDZDkN/xLtYIyVcSCYkw0qpsoJ7Rtzxpm0aUQetJwcFcrB9XYCTdXtpY+jEr+DJ9yhtoAKFEN9n1FlNq+69nrbYJLbvy6iHpwAHPCYjl62LODmF7UEBGgAMj2NSkTwZjy7JuuS4= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; 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Mon, 2 Oct 2023 20:32:37 +0000 (UTC) Received: from lacos-laptop-9.usersys.redhat.com (unknown [10.39.192.119]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8F76840C6EBF; Mon, 2 Oct 2023 20:32:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1696278759; 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=FNxOG/drRlkY3d6uhvoOfPq4VgCa4J4atWRHGxUXUNo=; b=gYu+RcGdaa0+e+n4eKIw0QIhluGHlMjcFk5Fhlut5I32PseVYph94bhiY5iYFUaJSKlAp5 d8tmYyHKvmkBDIVDrsCn/GQ5WdHVq8Ymt0M/6Vs3uIISvA20pGA5ovm9EKanyGOidZ873D sevWmlFhUbOFySKdslEAxwXV/KYF5fI= X-MC-Unique: 4C9K9IekOE-sXpyArf8PyQ-1 From: Laszlo Ersek To: qemu-devel@nongnu.org, lersek@redhat.com Cc: "Michael S. Tsirkin" , Eugenio Perez Martin , German Maglione , Liu Jiang , Sergio Lopez Pascual , Stefano Garzarella Subject: [PATCH v3 3/7] vhost-user: factor out "vhost_user_write_sync" Date: Mon, 2 Oct 2023 22:32:17 +0200 Message-Id: <20231002203221.17241-4-lersek@redhat.com> In-Reply-To: <20231002203221.17241-1-lersek@redhat.com> References: <20231002203221.17241-1-lersek@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=lersek@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1696278882551100003 Content-Type: text/plain; charset="utf-8" The tails of the "vhost_user_set_vring_addr" and "vhost_user_set_u64" functions are now byte-for-byte identical. Factor the common tail out to a new function called "vhost_user_write_sync". This is purely refactoring -- no observable change. Cc: "Michael S. Tsirkin" (supporter:vhost) Cc: Eugenio Perez Martin Cc: German Maglione Cc: Liu Jiang Cc: Sergio Lopez Pascual Cc: Stefano Garzarella Signed-off-by: Laszlo Ersek Reviewed-by: Philippe Mathieu-Daud=C3=A9 Reviewed-by: Stefano Garzarella Tested-by: Albert Esteve Reviewed-by: Eugenio P=C3=A9rez --- Notes: v3: =20 - pick up R-b from Eugenio, T-b from Albert =20 v2: =20 - pick up R-b's from Phil and Stefano =20 - rename "vhost_user_write_msg" to "vhost_user_write_sync" (in code and commit message) [Stefano] hw/virtio/vhost-user.c | 66 +++++++++----------- 1 file changed, 28 insertions(+), 38 deletions(-) diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index 64eac317bfb2..1476b36f0a6e 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -1320,10 +1320,35 @@ static int enforce_reply(struct vhost_dev *dev, return vhost_user_get_features(dev, &dummy); } =20 +/* Note: "msg->hdr.flags" may be modified. */ +static int vhost_user_write_sync(struct vhost_dev *dev, VhostUserMsg *msg, + bool wait_for_reply) +{ + int ret; + + if (wait_for_reply) { + bool reply_supported =3D virtio_has_feature(dev->protocol_features, + VHOST_USER_PROTOCOL_F_REPLY_ACK); + if (reply_supported) { + msg->hdr.flags |=3D VHOST_USER_NEED_REPLY_MASK; + } + } + + ret =3D vhost_user_write(dev, msg, NULL, 0); + if (ret < 0) { + return ret; + } + + if (wait_for_reply) { + return enforce_reply(dev, msg); + } + + return 0; +} + static int vhost_user_set_vring_addr(struct vhost_dev *dev, struct vhost_vring_addr *addr) { - int ret; VhostUserMsg msg =3D { .hdr.request =3D VHOST_USER_SET_VRING_ADDR, .hdr.flags =3D VHOST_USER_VERSION, @@ -1337,24 +1362,7 @@ static int vhost_user_set_vring_addr(struct vhost_de= v *dev, */ bool wait_for_reply =3D addr->flags & (1 << VHOST_VRING_F_LOG); =20 - if (wait_for_reply) { - bool reply_supported =3D virtio_has_feature(dev->protocol_features, - VHOST_USER_PROTOCOL_F_REPLY_ACK); - if (reply_supported) { - msg.hdr.flags |=3D VHOST_USER_NEED_REPLY_MASK; - } - } - - ret =3D vhost_user_write(dev, &msg, NULL, 0); - if (ret < 0) { - return ret; - } - - if (wait_for_reply) { - return enforce_reply(dev, &msg); - } - - return 0; + return vhost_user_write_sync(dev, &msg, wait_for_reply); } =20 static int vhost_user_set_u64(struct vhost_dev *dev, int request, uint64_t= u64, @@ -1366,26 +1374,8 @@ static int vhost_user_set_u64(struct vhost_dev *dev,= int request, uint64_t u64, .payload.u64 =3D u64, .hdr.size =3D sizeof(msg.payload.u64), }; - int ret; =20 - if (wait_for_reply) { - bool reply_supported =3D virtio_has_feature(dev->protocol_features, - VHOST_USER_PROTOCOL_F_REPLY_ACK); - if (reply_supported) { - msg.hdr.flags |=3D VHOST_USER_NEED_REPLY_MASK; - } - } - - ret =3D vhost_user_write(dev, &msg, NULL, 0); - if (ret < 0) { - return ret; - } - - if (wait_for_reply) { - return enforce_reply(dev, &msg); - } - - return 0; + return vhost_user_write_sync(dev, &msg, wait_for_reply); } =20 static int vhost_user_set_status(struct vhost_dev *dev, uint8_t status) From nobody Tue May 14 11:02:03 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; 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Mon, 02 Oct 2023 16:32:54 -0400 Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-358-Coh6_GC7N9WR6_BP-K-cwQ-1; Mon, 02 Oct 2023 16:32:40 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 1C0EF811E7B; Mon, 2 Oct 2023 20:32:40 +0000 (UTC) Received: from lacos-laptop-9.usersys.redhat.com (unknown [10.39.192.119]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0AAF840C6EBF; Mon, 2 Oct 2023 20:32:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1696278771; 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=Gqkn9cVUW8+iFFFAJvE87tVhYI+EY4ld357DksWpoqw=; b=L2xw8zVQ1GDJkud8njaN340tkfTy6EX3+A+zgUkuGEN+e1h6aWP+akw061guwv9LtIl+7u owL5CwezuxUusoD2DZMqIG0xAS2wU9bfrhdQZnFW9pFHVxehhiUQ7FreLArZ6pratzoCCO X3YpSRXcJu1JPTYn9KDm6gG1rJqVmYM= X-MC-Unique: Coh6_GC7N9WR6_BP-K-cwQ-1 From: Laszlo Ersek To: qemu-devel@nongnu.org, lersek@redhat.com Cc: "Michael S. Tsirkin" , Eugenio Perez Martin , German Maglione , Liu Jiang , Sergio Lopez Pascual , Stefano Garzarella Subject: [PATCH v3 4/7] vhost-user: flatten "enforce_reply" into "vhost_user_write_sync" Date: Mon, 2 Oct 2023 22:32:18 +0200 Message-Id: <20231002203221.17241-5-lersek@redhat.com> In-Reply-To: <20231002203221.17241-1-lersek@redhat.com> References: <20231002203221.17241-1-lersek@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=lersek@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1696278835438100003 Content-Type: text/plain; charset="utf-8" At this point, only "vhost_user_write_sync" calls "enforce_reply"; embed the latter into the former. This is purely refactoring -- no observable change. Cc: "Michael S. Tsirkin" (supporter:vhost) Cc: Eugenio Perez Martin Cc: German Maglione Cc: Liu Jiang Cc: Sergio Lopez Pascual Cc: Stefano Garzarella Signed-off-by: Laszlo Ersek Reviewed-by: Philippe Mathieu-Daud=C3=A9 Reviewed-by: Stefano Garzarella Tested-by: Albert Esteve Reviewed-by: Eugenio P=C3=A9rez --- Notes: v3: =20 - pick up R-b from Eugenio, T-b from Albert =20 v2: =20 - pick up R-b's from Phil and Stefano =20 - rename "vhost_user_write_msg" to "vhost_user_write_sync" (in code context and commit message) [Stefano] hw/virtio/vhost-user.c | 32 ++++++++------------ 1 file changed, 13 insertions(+), 19 deletions(-) diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index 1476b36f0a6e..4129ba72e408 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -1302,24 +1302,6 @@ static int vhost_user_get_features(struct vhost_dev = *dev, uint64_t *features) return 0; } =20 -static int enforce_reply(struct vhost_dev *dev, - const VhostUserMsg *msg) -{ - uint64_t dummy; - - if (msg->hdr.flags & VHOST_USER_NEED_REPLY_MASK) { - return process_message_reply(dev, msg); - } - - /* - * We need to wait for a reply but the backend does not - * support replies for the command we just sent. - * Send VHOST_USER_GET_FEATURES which makes all backends - * send a reply. - */ - return vhost_user_get_features(dev, &dummy); -} - /* Note: "msg->hdr.flags" may be modified. */ static int vhost_user_write_sync(struct vhost_dev *dev, VhostUserMsg *msg, bool wait_for_reply) @@ -1340,7 +1322,19 @@ static int vhost_user_write_sync(struct vhost_dev *d= ev, VhostUserMsg *msg, } =20 if (wait_for_reply) { - return enforce_reply(dev, msg); + uint64_t dummy; + + if (msg->hdr.flags & VHOST_USER_NEED_REPLY_MASK) { + return process_message_reply(dev, msg); + } + + /* + * We need to wait for a reply but the backend does not + * support replies for the command we just sent. + * Send VHOST_USER_GET_FEATURES which makes all backends + * send a reply. + */ + return vhost_user_get_features(dev, &dummy); } =20 return 0; From nobody Tue May 14 11:02:03 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; 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Mon, 02 Oct 2023 16:32:46 -0400 Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-286-TJ9N5eUHO4i_jT2wUtAxJQ-1; Mon, 02 Oct 2023 16:32:42 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 8D877811E7E; Mon, 2 Oct 2023 20:32:42 +0000 (UTC) Received: from lacos-laptop-9.usersys.redhat.com (unknown [10.39.192.119]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7AAF940C6EBF; Mon, 2 Oct 2023 20:32:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1696278764; 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=PFA/Prb6o6KEE5fPBsFRk33AjGqGuJPgq23VOAGuoEc=; b=DnvFxC463IC6sN0XFrrUkDn71N4WO2SR2QnH1LUd0y8b+EKYcnKm8kVPSQGjHETTDOljoM 1M/tZE+3xfEycX/0AlryMJVdLzH1qqjDpKA5C/naBGpzpUrCoZjGWeM/npfivE0n/pMfdj 9cgObilDBeuTHtNdztUQyDH49gF1DM8= X-MC-Unique: TJ9N5eUHO4i_jT2wUtAxJQ-1 From: Laszlo Ersek To: qemu-devel@nongnu.org, lersek@redhat.com Cc: "Michael S. Tsirkin" , Eugenio Perez Martin , German Maglione , Liu Jiang , Sergio Lopez Pascual , Stefano Garzarella Subject: [PATCH v3 5/7] vhost-user: hoist "write_sync", "get_features", "get_u64" Date: Mon, 2 Oct 2023 22:32:19 +0200 Message-Id: <20231002203221.17241-6-lersek@redhat.com> In-Reply-To: <20231002203221.17241-1-lersek@redhat.com> References: <20231002203221.17241-1-lersek@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=lersek@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1696278829846100003 Content-Type: text/plain; charset="utf-8" In order to avoid a forward-declaration for "vhost_user_write_sync" in a subsequent patch, hoist "vhost_user_write_sync" -> "vhost_user_get_features" -> "vhost_user_get_u64" just above "vhost_set_vring". This is purely code movement -- no observable change. Cc: "Michael S. Tsirkin" (supporter:vhost) Cc: Eugenio Perez Martin Cc: German Maglione Cc: Liu Jiang Cc: Sergio Lopez Pascual Cc: Stefano Garzarella Signed-off-by: Laszlo Ersek Reviewed-by: Stefano Garzarella Tested-by: Albert Esteve Reviewed-by: Philippe Mathieu-Daud=C3=A9 Reviewed-by: Eugenio P=C3=A9rez --- Notes: v3: =20 - pick up R-b from Phil and Eugenio, T-b from Albert =20 v2: =20 - pick up R-b from Stefano =20 - rename "vhost_user_write_msg" to "vhost_user_write_sync" (in code and commit message) [Stefano] hw/virtio/vhost-user.c | 170 ++++++++++---------- 1 file changed, 85 insertions(+), 85 deletions(-) diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index 4129ba72e408..c79b6f77cdca 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -1083,6 +1083,91 @@ static int vhost_user_set_vring_endian(struct vhost_= dev *dev, return vhost_user_write(dev, &msg, NULL, 0); } =20 +static int vhost_user_get_u64(struct vhost_dev *dev, int request, uint64_t= *u64) +{ + int ret; + VhostUserMsg msg =3D { + .hdr.request =3D request, + .hdr.flags =3D VHOST_USER_VERSION, + }; + + if (vhost_user_per_device_request(request) && dev->vq_index !=3D 0) { + return 0; + } + + ret =3D vhost_user_write(dev, &msg, NULL, 0); + if (ret < 0) { + return ret; + } + + ret =3D vhost_user_read(dev, &msg); + if (ret < 0) { + return ret; + } + + if (msg.hdr.request !=3D request) { + error_report("Received unexpected msg type. Expected %d received %= d", + request, msg.hdr.request); + return -EPROTO; + } + + if (msg.hdr.size !=3D sizeof(msg.payload.u64)) { + error_report("Received bad msg size."); + return -EPROTO; + } + + *u64 =3D msg.payload.u64; + + return 0; +} + +static int vhost_user_get_features(struct vhost_dev *dev, uint64_t *featur= es) +{ + if (vhost_user_get_u64(dev, VHOST_USER_GET_FEATURES, features) < 0) { + return -EPROTO; + } + + return 0; +} + +/* Note: "msg->hdr.flags" may be modified. */ +static int vhost_user_write_sync(struct vhost_dev *dev, VhostUserMsg *msg, + bool wait_for_reply) +{ + int ret; + + if (wait_for_reply) { + bool reply_supported =3D virtio_has_feature(dev->protocol_features, + VHOST_USER_PROTOCOL_F_REPLY_ACK); + if (reply_supported) { + msg->hdr.flags |=3D VHOST_USER_NEED_REPLY_MASK; + } + } + + ret =3D vhost_user_write(dev, msg, NULL, 0); + if (ret < 0) { + return ret; + } + + if (wait_for_reply) { + uint64_t dummy; + + if (msg->hdr.flags & VHOST_USER_NEED_REPLY_MASK) { + return process_message_reply(dev, msg); + } + + /* + * We need to wait for a reply but the backend does not + * support replies for the command we just sent. + * Send VHOST_USER_GET_FEATURES which makes all backends + * send a reply. + */ + return vhost_user_get_features(dev, &dummy); + } + + return 0; +} + static int vhost_set_vring(struct vhost_dev *dev, unsigned long int request, struct vhost_vring_state *ring) @@ -1255,91 +1340,6 @@ static int vhost_user_set_vring_err(struct vhost_dev= *dev, return vhost_set_vring_file(dev, VHOST_USER_SET_VRING_ERR, file); } =20 -static int vhost_user_get_u64(struct vhost_dev *dev, int request, uint64_t= *u64) -{ - int ret; - VhostUserMsg msg =3D { - .hdr.request =3D request, - .hdr.flags =3D VHOST_USER_VERSION, - }; - - if (vhost_user_per_device_request(request) && dev->vq_index !=3D 0) { - return 0; - } - - ret =3D vhost_user_write(dev, &msg, NULL, 0); - if (ret < 0) { - return ret; - } - - ret =3D vhost_user_read(dev, &msg); - if (ret < 0) { - return ret; - } - - if (msg.hdr.request !=3D request) { - error_report("Received unexpected msg type. Expected %d received %= d", - request, msg.hdr.request); - return -EPROTO; - } - - if (msg.hdr.size !=3D sizeof(msg.payload.u64)) { - error_report("Received bad msg size."); - return -EPROTO; - } - - *u64 =3D msg.payload.u64; - - return 0; -} - -static int vhost_user_get_features(struct vhost_dev *dev, uint64_t *featur= es) -{ - if (vhost_user_get_u64(dev, VHOST_USER_GET_FEATURES, features) < 0) { - return -EPROTO; - } - - return 0; -} - -/* Note: "msg->hdr.flags" may be modified. */ -static int vhost_user_write_sync(struct vhost_dev *dev, VhostUserMsg *msg, - bool wait_for_reply) -{ - int ret; - - if (wait_for_reply) { - bool reply_supported =3D virtio_has_feature(dev->protocol_features, - VHOST_USER_PROTOCOL_F_REPLY_ACK); - if (reply_supported) { - msg->hdr.flags |=3D VHOST_USER_NEED_REPLY_MASK; - } - } - - ret =3D vhost_user_write(dev, msg, NULL, 0); - if (ret < 0) { - return ret; - } - - if (wait_for_reply) { - uint64_t dummy; - - if (msg->hdr.flags & VHOST_USER_NEED_REPLY_MASK) { - return process_message_reply(dev, msg); - } - - /* - * We need to wait for a reply but the backend does not - * support replies for the command we just sent. - * Send VHOST_USER_GET_FEATURES which makes all backends - * send a reply. - */ - return vhost_user_get_features(dev, &dummy); - } - - return 0; -} - static int vhost_user_set_vring_addr(struct vhost_dev *dev, struct vhost_vring_addr *addr) { From nobody Tue May 14 11:02:03 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1696278851; cv=none; d=zohomail.com; s=zohoarc; b=KJoarFz3s50BmMxBuvLBB6IW6TtXAjLhU7ppNTHAvP8W2tjax1SkguF2HEnW/3FfgODFHqz25fIOVJBCZF3l4Zpq0ngT/aWsFDEeRyPEjvysW4I948zLXeKAwJdLBQJ76i/7+XNETvA37VyAVkMH1M9oDx1nv4Yx+/8YlFDFua8= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; 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Mon, 2 Oct 2023 20:32:45 +0000 (UTC) Received: from lacos-laptop-9.usersys.redhat.com (unknown [10.39.192.119]) by smtp.corp.redhat.com (Postfix) with ESMTP id EA35D40C6EBF; Mon, 2 Oct 2023 20:32:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1696278767; 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=0nYH5tmHEHaZsrcQqH9kYvHwI5zmEvvxHuX9nbtNjjc=; b=PlEQaCwPD3fKfswNiV7BqRotZ5vV5gB/io282AjwetvotjYlQxava3/tmhDsSoPqs+iE/0 NvrwX6jRrMfuEWnQW8wCgMmJqablV4SjXi4Tm7IniuN2qcHY9Dwp7UzMBSRkjiDacf3RcV dvSQwMaXiRqLLzz1g1t6TuK6r9oWAew= X-MC-Unique: vVKI9Q89OCuKwNlecfAj4A-1 From: Laszlo Ersek To: qemu-devel@nongnu.org, lersek@redhat.com Cc: "Michael S. Tsirkin" , Eugenio Perez Martin , German Maglione , Liu Jiang , Sergio Lopez Pascual , Stefano Garzarella Subject: [PATCH v3 6/7] vhost-user: allow "vhost_set_vring" to wait for a reply Date: Mon, 2 Oct 2023 22:32:20 +0200 Message-Id: <20231002203221.17241-7-lersek@redhat.com> In-Reply-To: <20231002203221.17241-1-lersek@redhat.com> References: <20231002203221.17241-1-lersek@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=lersek@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1696278852554100001 Content-Type: text/plain; charset="utf-8" The "vhost_set_vring" function already centralizes the common parts of "vhost_user_set_vring_num", "vhost_user_set_vring_base" and "vhost_user_set_vring_enable". We'll want to allow some of those callers to wait for a reply. Therefore, rebase "vhost_set_vring" from just "vhost_user_write" to "vhost_user_write_sync", exposing the "wait_for_reply" parameter. This is purely refactoring -- there is no observable change. That's because: - all three callers pass in "false" for "wait_for_reply", which disables all logic in "vhost_user_write_sync" except the call to "vhost_user_write"; - the fds=3DNULL and fd_num=3D0 arguments of the original "vhost_user_write" call inside "vhost_set_vring" are hard-coded within "vhost_user_write_sync". Cc: "Michael S. Tsirkin" (supporter:vhost) Cc: Eugenio Perez Martin Cc: German Maglione Cc: Liu Jiang Cc: Sergio Lopez Pascual Cc: Stefano Garzarella Signed-off-by: Laszlo Ersek Reviewed-by: Philippe Mathieu-Daud=C3=A9 Reviewed-by: Stefano Garzarella Tested-by: Albert Esteve Reviewed-by: Eugenio P=C3=A9rez --- Notes: v3: =20 - pick up R-b from Eugenio, T-b from Albert =20 v2: =20 - pick up R-b's from Phil and Stefano =20 - rename "vhost_user_write_msg" to "vhost_user_write_sync" (in code and commit message) [Stefano] hw/virtio/vhost-user.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index c79b6f77cdca..18e15a9bb359 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -1170,7 +1170,8 @@ static int vhost_user_write_sync(struct vhost_dev *de= v, VhostUserMsg *msg, =20 static int vhost_set_vring(struct vhost_dev *dev, unsigned long int request, - struct vhost_vring_state *ring) + struct vhost_vring_state *ring, + bool wait_for_reply) { VhostUserMsg msg =3D { .hdr.request =3D request, @@ -1179,13 +1180,13 @@ static int vhost_set_vring(struct vhost_dev *dev, .hdr.size =3D sizeof(msg.payload.state), }; =20 - return vhost_user_write(dev, &msg, NULL, 0); + return vhost_user_write_sync(dev, &msg, wait_for_reply); } =20 static int vhost_user_set_vring_num(struct vhost_dev *dev, struct vhost_vring_state *ring) { - return vhost_set_vring(dev, VHOST_USER_SET_VRING_NUM, ring); + return vhost_set_vring(dev, VHOST_USER_SET_VRING_NUM, ring, false); } =20 static void vhost_user_host_notifier_free(VhostUserHostNotifier *n) @@ -1216,7 +1217,7 @@ static void vhost_user_host_notifier_remove(VhostUser= HostNotifier *n, static int vhost_user_set_vring_base(struct vhost_dev *dev, struct vhost_vring_state *ring) { - return vhost_set_vring(dev, VHOST_USER_SET_VRING_BASE, ring); + return vhost_set_vring(dev, VHOST_USER_SET_VRING_BASE, ring, false); } =20 static int vhost_user_set_vring_enable(struct vhost_dev *dev, int enable) @@ -1234,7 +1235,7 @@ static int vhost_user_set_vring_enable(struct vhost_d= ev *dev, int enable) .num =3D enable, }; =20 - ret =3D vhost_set_vring(dev, VHOST_USER_SET_VRING_ENABLE, &state); + ret =3D vhost_set_vring(dev, VHOST_USER_SET_VRING_ENABLE, &state, = false); if (ret < 0) { /* * Restoring the previous state is likely infeasible, as well = as From nobody Tue May 14 11:02:03 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1696278864; cv=none; d=zohomail.com; s=zohoarc; b=mifIOQXfSL5LABzyWN5dFPg0KttAiMQfXBUifVs1POMEHQZAff+RxylsK8qWXmm1V5qjDL6zxfWs46zKWil4SExgQuYAfOZnqalGAFlVUe9Hy8pnUXyq1aF/J73Dru9bjXXe4Os9YDQgbf4Bg4bkmR0zF90mt+uFmIeWudzO6WE= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1696278864; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; 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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1696278770; 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=BhFdydZThHY12w/bm97zGukl7AatGfEDNNzJZgKLQ8M=; b=GdQXHtndT6dHBAJZEyVIe3ViFvOIBc7r0ijVRyViv+Xz59GBBpD2AWDMHrN3cQ6eQFbzOB MLTxj0VyYedZL4zTU2XfEbpAg/AU4hZfTqAaj4xieLB8KR+6oOlQOvTgXYhPmHFOkv+ode Y3hWCp0JUT2DdPRAlWV3GJYpezsUUwk= X-MC-Unique: wn5rVc1bOtmrUloAqPTxPg-1 From: Laszlo Ersek To: qemu-devel@nongnu.org, lersek@redhat.com Cc: "Michael S. Tsirkin" , Eugenio Perez Martin , German Maglione , Liu Jiang , Sergio Lopez Pascual , Stefano Garzarella Subject: [PATCH v3 7/7] vhost-user: call VHOST_USER_SET_VRING_ENABLE synchronously Date: Mon, 2 Oct 2023 22:32:21 +0200 Message-Id: <20231002203221.17241-8-lersek@redhat.com> In-Reply-To: <20231002203221.17241-1-lersek@redhat.com> References: <20231002203221.17241-1-lersek@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=lersek@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1696278866795100003 Content-Type: text/plain; charset="utf-8" (1) The virtio-1.2 specification writes: > 3 General Initialization And Device Operation > 3.1 Device Initialization > 3.1.1 Driver Requirements: Device Initialization > > [...] > > 7. Perform device-specific setup, including discovery of virtqueues for > the device, optional per-bus setup, reading and possibly writing the > device=E2=80=99s virtio configuration space, and population of virtque= ues. > > 8. Set the DRIVER_OK status bit. At this point the device is =E2=80=9Cliv= e=E2=80=9D. and > 4 Virtio Transport Options > 4.1 Virtio Over PCI Bus > 4.1.4 Virtio Structure PCI Capabilities > 4.1.4.3 Common configuration structure layout > 4.1.4.3.2 Driver Requirements: Common configuration structure layout > > [...] > > The driver MUST configure the other virtqueue fields before enabling the > virtqueue with queue_enable. > > [...] (The same statements are present in virtio-1.0 identically, at .) These together mean that the following sub-sequence of steps is valid for a virtio-1.0 guest driver: (1.1) set "queue_enable" for the needed queues as the final part of device initialization step (7), (1.2) set DRIVER_OK in step (8), (1.3) immediately start sending virtio requests to the device. (2) When vhost-user is enabled, and the VHOST_USER_F_PROTOCOL_FEATURES special virtio feature is negotiated, then virtio rings start in disabled state, according to . In this case, explicit VHOST_USER_SET_VRING_ENABLE messages are needed for enabling vrings. Therefore setting "queue_enable" from the guest (1.1) -- which is technically "buffered" on the QEMU side until the guest sets DRIVER_OK (1.2) -- is a *control plane* operation, which -- after (1.2) -- travels from the guest through QEMU to the vhost-user backend, using a unix domain socket. Whereas sending a virtio request (1.3) is a *data plane* operation, which evades QEMU -- it travels from guest to the vhost-user backend via eventfd. This means that operations ((1.1) + (1.2)) and (1.3) travel through different channels, and their relative order can be reversed, as perceived by the vhost-user backend. That's exactly what happens when OVMF's virtiofs driver (VirtioFsDxe) runs against the Rust-language virtiofsd version 1.7.2. (Which uses version 0.10.1 of the vhost-user-backend crate, and version 0.8.1 of the vhost crate.) Namely, when VirtioFsDxe binds a virtiofs device, it goes through the device initialization steps (i.e., control plane operations), and immediately sends a FUSE_INIT request too (i.e., performs a data plane operation). In the Rust-language virtiofsd, this creates a race between two components that run *concurrently*, i.e., in different threads or processes: - Control plane, handling vhost-user protocol messages: The "VhostUserSlaveReqHandlerMut::set_vring_enable" method [crates/vhost-user-backend/src/handler.rs] handles VHOST_USER_SET_VRING_ENABLE messages, and updates each vring's "enabled" flag according to the message processed. - Data plane, handling virtio / FUSE requests: The "VringEpollHandler::handle_event" method [crates/vhost-user-backend/src/event_loop.rs] handles the incoming virtio / FUSE request, consuming the virtio kick at the same time. If the vring's "enabled" flag is set, the virtio / FUSE request is processed genuinely. If the vring's "enabled" flag is clear, then the virtio / FUSE request is discarded. Note that OVMF enables the queue *first*, and sends FUSE_INIT *second*. However, if the data plane processor in virtiofsd wins the race, then it sees the FUSE_INIT *before* the control plane processor took notice of VHOST_USER_SET_VRING_ENABLE and green-lit the queue for the data plane processor. Therefore the latter drops FUSE_INIT on the floor, and goes back to waiting for further virtio / FUSE requests with epoll_wait. Meanwhile OVMF is stuck waiting for the FUSET_INIT response -- a deadlock. The deadlock is not deterministic. OVMF hangs infrequently during first boot. However, OVMF hangs almost certainly during reboots from the UEFI shell. The race can be "reliably masked" by inserting a very small delay -- a single debug message -- at the top of "VringEpollHandler::handle_event", i.e., just before the data plane processor checks the "enabled" field of the vring. That delay suffices for the control plane processor to act upon VHOST_USER_SET_VRING_ENABLE. We can deterministically prevent the race in QEMU, by blocking OVMF inside step (1.2) -- i.e., in the write to the device status register that "unleashes" queue enablement -- until VHOST_USER_SET_VRING_ENABLE actually *completes*. That way OVMF's VCPU cannot advance to the FUSE_INIT submission before virtiofsd's control plane processor takes notice of the queue being enabled. Wait for VHOST_USER_SET_VRING_ENABLE completion by: - setting the NEED_REPLY flag on VHOST_USER_SET_VRING_ENABLE, and waiting for the reply, if the VHOST_USER_PROTOCOL_F_REPLY_ACK vhost-user feature has been negotiated, or - performing a separate VHOST_USER_GET_FEATURES *exchange*, which requires a backend response regardless of VHOST_USER_PROTOCOL_F_REPLY_ACK. Cc: "Michael S. Tsirkin" (supporter:vhost) Cc: Eugenio Perez Martin Cc: German Maglione Cc: Liu Jiang Cc: Sergio Lopez Pascual Cc: Stefano Garzarella Signed-off-by: Laszlo Ersek Reviewed-by: Stefano Garzarella Tested-by: Albert Esteve [lersek@redhat.com: work Eugenio's explanation into the commit message, about QEMU containing step (1.1) until step (1.2)] Reviewed-by: Eugenio P=C3=A9rez --- Notes: v3: =20 - pick up R-b from Eugenio, T-b from Albert =20 - clarify commit message (also give permanent credit for the clarification; I feel the change is important enough) [Eugenio] =20 v2: =20 - pick up R-b from Stefano =20 - update virtio spec reference from 1.0 to 1.2 (also keep the 1.0 ref) in the commit message; re-check the quotes / section headers [Stefano] =20 - summarize commit message in code comment [Stefano] hw/virtio/vhost-user.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index 18e15a9bb359..41842eb023b5 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -1235,7 +1235,21 @@ static int vhost_user_set_vring_enable(struct vhost_= dev *dev, int enable) .num =3D enable, }; =20 - ret =3D vhost_set_vring(dev, VHOST_USER_SET_VRING_ENABLE, &state, = false); + /* + * SET_VRING_ENABLE travels from guest to QEMU to vhost-user backe= nd / + * control plane thread via unix domain socket. Virtio requests tr= avel + * from guest to vhost-user backend / data plane thread via eventf= d. + * Even if the guest enables the ring first, and pushes its first = virtio + * request second (conforming to the virtio spec), the data plane = thread + * in the backend may see the virtio request before the control pl= ane + * thread sees the queue enablement. This causes (in fact, require= s) the + * data plane thread to discard the virtio request (it arrived on a + * seemingly disabled queue). To prevent this out-of-order deliver= y, + * don't let the guest proceed to pushing the virtio request until= the + * backend control plane acknowledges enabling the queue -- IOW, p= ass + * wait_for_reply=3Dtrue below. + */ + ret =3D vhost_set_vring(dev, VHOST_USER_SET_VRING_ENABLE, &state, = true); if (ret < 0) { /* * Restoring the previous state is likely infeasible, as well = as