From nobody Mon Feb 9 06:01:42 2026 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=1657816482; cv=none; d=zohomail.com; s=zohoarc; b=b2oYzE2RiGVzMUiQSeuY4gopszVlk81eJtfYD94ByC65EIKKBTvg7OiNQ9Ll0LxRCQvVuaEV5c5V61Wc3gqjWSiQJlHtbu2iCa6Wre0k9my9e/Jda7/1Hh5NGUnAQsG/g+l/1hgEYKwJ10/T1jf063dMNQHP+foq9gYXV0IAzT8= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1657816482; 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=D1sjQXZ7pGh62ovINMUtfVB0I9xu7GNacygyfka+sgY=; b=PLdif6KWwQ4GCWnA3Mf0wZracPCbitD2oyfLS3LzqrYz2KI62OxgFOEtKI/FXMsYfEwXKhBVqSTjQHZti174g94eAUDOAqGQEQTyn4tS1b+ff14UME7G9MG+N2Ql/lEVwSLM+whtRdRdsMk8WJqUyvRPwreso7p9kLjlppW5FHk= 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 1657816482334453.24580627791545; Thu, 14 Jul 2022 09:34:42 -0700 (PDT) Received: from localhost ([::1]:35228 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oC1nV-000221-9B for importer@patchew.org; Thu, 14 Jul 2022 12:34:41 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:36746) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oC1lI-0007RH-Cp for qemu-devel@nongnu.org; Thu, 14 Jul 2022 12:32:24 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:54211) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oC1lG-0003Kj-Or for qemu-devel@nongnu.org; Thu, 14 Jul 2022 12:32:24 -0400 Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-589-GcAUO9ibOHqaFt4JY6uq_w-1; Thu, 14 Jul 2022 12:32:18 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 9D5623C021B6; Thu, 14 Jul 2022 16:32:17 +0000 (UTC) Received: from eperezma.remote.csb (unknown [10.39.192.102]) by smtp.corp.redhat.com (Postfix) with ESMTP id C415E1121314; Thu, 14 Jul 2022 16:32:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1657816341; 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=D1sjQXZ7pGh62ovINMUtfVB0I9xu7GNacygyfka+sgY=; b=cYoD8Xt3/AC0Cd3QdQmZ55oorICysqS58lQ6Qr8nzHeefwGpoW0/mYWAAg/OZeVNUcyy5e HJif/rPvh3Qv91r3qn8ljv3pg1avR3zdZR4zwWs4dJ8Lezo3T9EEueikqgexb4H+dpiv0Z EnuTQvRvUNDyoPNIyt77XLWza8Ro2Rc= X-MC-Unique: GcAUO9ibOHqaFt4JY6uq_w-1 From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= To: qemu-devel@nongnu.org Cc: Gautam Dawar , Paolo Bonzini , "Michael S. Tsirkin" , Stefano Garzarella , Eric Blake , Zhu Lingshan , Stefan Hajnoczi , Markus Armbruster , Cornelia Huck , Parav Pandit , Laurent Vivier , Liuxiangdong , Eli Cohen , Cindy Lu , Harpreet Singh Anand , Jason Wang , "Gonglei (Arei)" Subject: [PATCH v2 07/19] vhost: Decouple vhost_svq_add from VirtQueueElement Date: Thu, 14 Jul 2022 18:31:38 +0200 Message-Id: <20220714163150.2536327-8-eperezma@redhat.com> In-Reply-To: <20220714163150.2536327-1-eperezma@redhat.com> References: <20220714163150.2536327-1-eperezma@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 2.78 on 10.11.54.3 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=eperezma@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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" X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1657816484686100001 VirtQueueElement comes from the guest, but we're heading SVQ to be able to modify the element presented to the device without the guest's knowledge. To do so, make SVQ accept sg buffers directly, instead of using VirtQueueElement. Add vhost_svq_add_element to maintain element convenience. Signed-off-by: Eugenio P=C3=A9rez Acked-by: Jason Wang --- hw/virtio/vhost-shadow-virtqueue.c | 33 ++++++++++++++++++++---------- 1 file changed, 22 insertions(+), 11 deletions(-) diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-vi= rtqueue.c index aee9891a67..b005a457c6 100644 --- a/hw/virtio/vhost-shadow-virtqueue.c +++ b/hw/virtio/vhost-shadow-virtqueue.c @@ -172,30 +172,31 @@ static bool vhost_svq_vring_write_descs(VhostShadowVi= rtqueue *svq, hwaddr *sg, } =20 static bool vhost_svq_add_split(VhostShadowVirtqueue *svq, - VirtQueueElement *elem, unsigned *head) + const struct iovec *out_sg, size_t out_num, + const struct iovec *in_sg, size_t in_num, + unsigned *head) { unsigned avail_idx; vring_avail_t *avail =3D svq->vring.avail; bool ok; - g_autofree hwaddr *sgs =3D g_new(hwaddr, MAX(elem->out_num, elem->in_n= um)); + g_autofree hwaddr *sgs =3D g_new(hwaddr, MAX(out_num, in_num)); =20 *head =3D svq->free_head; =20 /* We need some descriptors here */ - if (unlikely(!elem->out_num && !elem->in_num)) { + if (unlikely(!out_num && !in_num)) { qemu_log_mask(LOG_GUEST_ERROR, "Guest provided element with no descriptors"); return false; } =20 - ok =3D vhost_svq_vring_write_descs(svq, sgs, elem->out_sg, elem->out_n= um, - elem->in_num > 0, false); + ok =3D vhost_svq_vring_write_descs(svq, sgs, out_sg, out_num, in_num >= 0, + false); if (unlikely(!ok)) { return false; } =20 - ok =3D vhost_svq_vring_write_descs(svq, sgs, elem->in_sg, elem->in_num= , false, - true); + ok =3D vhost_svq_vring_write_descs(svq, sgs, in_sg, in_num, false, tru= e); if (unlikely(!ok)) { return false; } @@ -237,17 +238,19 @@ static void vhost_svq_kick(VhostShadowVirtqueue *svq) * * Return -EINVAL if element is invalid, -ENOSPC if dev queue is full */ -static int vhost_svq_add(VhostShadowVirtqueue *svq, VirtQueueElement *elem) +static int vhost_svq_add(VhostShadowVirtqueue *svq, const struct iovec *ou= t_sg, + size_t out_num, const struct iovec *in_sg, + size_t in_num, VirtQueueElement *elem) { unsigned qemu_head; - unsigned ndescs =3D elem->in_num + elem->out_num; + unsigned ndescs =3D in_num + out_num; bool ok; =20 if (unlikely(ndescs > vhost_svq_available_slots(svq))) { return -ENOSPC; } =20 - ok =3D vhost_svq_add_split(svq, elem, &qemu_head); + ok =3D vhost_svq_add_split(svq, out_sg, out_num, in_sg, in_num, &qemu_= head); if (unlikely(!ok)) { g_free(elem); return -EINVAL; @@ -258,6 +261,14 @@ static int vhost_svq_add(VhostShadowVirtqueue *svq, Vi= rtQueueElement *elem) return 0; } =20 +/* Convenience wrapper to add a guest's element to SVQ */ +static int vhost_svq_add_element(VhostShadowVirtqueue *svq, + VirtQueueElement *elem) +{ + return vhost_svq_add(svq, elem->out_sg, elem->out_num, elem->in_sg, + elem->in_num, elem); +} + /** * Forward available buffers. * @@ -294,7 +305,7 @@ static void vhost_handle_guest_kick(VhostShadowVirtqueu= e *svq) break; } =20 - r =3D vhost_svq_add(svq, elem); + r =3D vhost_svq_add_element(svq, elem); if (unlikely(r !=3D 0)) { if (r =3D=3D -ENOSPC) { /* --=20 2.31.1