From nobody Mon Feb 9 04:14:47 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=1658141150; cv=none; d=zohomail.com; s=zohoarc; b=AyjpFQ4Lc+E4yrRY9qd9UUlNi/UZX1khm4Xg1LjzE98hSMW2wAkuA9SkiBbZjGy3EeXBWDmXtJNm5pKSvcXZbrVt4E0yUxan714celmucefh1b/MBSh8OghH7k0Qw1OXzi4jGVhI4yTZQapa1wab4JrrhOGL4P64GIRZIG9sWcw= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1658141150; 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=eUj+IsouhY5Fm8JAI1LY9cCh0zDRy7WQa9mbuUixvV4=; b=OM3JgbZuYBxsbfejcBceGL+4TEp+fCwmfRD0n+q5HHIkeqNC3MFjiXaKhNN4d2yDAzXWijkBKyNX0w8AbZtf/6CYYZ10VUwOD0GMG44Qfs09R3w9/72mOpcKjyeDDa8Puh2pyA3FvRkc/voptIUcclLlWyqhOmRsIwfXzF5PuD8= 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 1658141150379474.00002457826326; Mon, 18 Jul 2022 03:45:50 -0700 (PDT) Received: from localhost ([::1]:33724 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oDOG4-0003f4-Ak for importer@patchew.org; Mon, 18 Jul 2022 06:45:48 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:54932) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oDO1d-0000Zm-Je for qemu-devel@nongnu.org; Mon, 18 Jul 2022 06:30:53 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:20336) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oDO1c-0001Xc-3U for qemu-devel@nongnu.org; Mon, 18 Jul 2022 06:30:53 -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-374-SaxM4Od6O8ua5ncblZqMZQ-1; Mon, 18 Jul 2022 06:30:36 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 8C47F811E75; Mon, 18 Jul 2022 10:30:35 +0000 (UTC) Received: from eperezma.remote.csb (unknown [10.39.192.86]) by smtp.corp.redhat.com (Postfix) with ESMTP id E69182166B26; Mon, 18 Jul 2022 10:30:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1658140250; 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=eUj+IsouhY5Fm8JAI1LY9cCh0zDRy7WQa9mbuUixvV4=; b=ZzENZn4/0+Oqe3lQO1C23dngl0/0k6/UmbVSQKBMMdno8YAxsPTBKMwrA9tgcprfTWspGS WuswDAKSm/mtloZgZsTPeK8WqMVjzikdCZUrK58GCUEVEBqeiM2EaPxz4sXLD89pOyYnf2 yrzsVsLt9Z5L1pAM8GOXsKHxT0xjL1U= X-MC-Unique: SaxM4Od6O8ua5ncblZqMZQ-1 From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= To: qemu-devel@nongnu.org Cc: Cindy Lu , Gautam Dawar , Cornelia Huck , Laurent Vivier , Paolo Bonzini , "Gonglei (Arei)" , Zhu Lingshan , Stefan Hajnoczi , Liuxiangdong , Jason Wang , Stefano Garzarella , Eli Cohen , Harpreet Singh Anand , "Michael S. Tsirkin" , Eric Blake , Markus Armbruster , Parav Pandit Subject: [PATCH v4 09/19] vhost: Track number of descs in SVQDescState Date: Mon, 18 Jul 2022 12:29:39 +0200 Message-Id: <20220718102949.2868267-10-eperezma@redhat.com> In-Reply-To: <20220718102949.2868267-1-eperezma@redhat.com> References: <20220718102949.2868267-1-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 10.11.54.6 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=eperezma@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 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_NONE=-0.0001, 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: 1658141151139100002 A guest's buffer continuos on GPA may need multiple descriptors on qemu's VA, so SVQ should track its length sepparatedly. Signed-off-by: Eugenio P=C3=A9rez --- hw/virtio/vhost-shadow-virtqueue.h | 6 ++++++ hw/virtio/vhost-shadow-virtqueue.c | 4 ++-- 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/hw/virtio/vhost-shadow-virtqueue.h b/hw/virtio/vhost-shadow-vi= rtqueue.h index d646c35054..5c7e7cbab6 100644 --- a/hw/virtio/vhost-shadow-virtqueue.h +++ b/hw/virtio/vhost-shadow-virtqueue.h @@ -17,6 +17,12 @@ =20 typedef struct SVQDescState { VirtQueueElement *elem; + + /* + * Number of descriptors exposed to the device. May or may not match + * guest's + */ + unsigned int ndescs; } SVQDescState; =20 /* Shadow virtqueue to relay notifications */ diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-vi= rtqueue.c index d12f5afffb..ae5bd6efa8 100644 --- a/hw/virtio/vhost-shadow-virtqueue.c +++ b/hw/virtio/vhost-shadow-virtqueue.c @@ -257,6 +257,7 @@ static int vhost_svq_add(VhostShadowVirtqueue *svq, con= st struct iovec *out_sg, } =20 svq->desc_state[qemu_head].elem =3D elem; + svq->desc_state[qemu_head].ndescs =3D ndescs; vhost_svq_kick(svq); return 0; } @@ -417,8 +418,7 @@ static VirtQueueElement *vhost_svq_get_buf(VhostShadowV= irtqueue *svq, return NULL; } =20 - num =3D svq->desc_state[used_elem.id].elem->in_num + - svq->desc_state[used_elem.id].elem->out_num; + num =3D svq->desc_state[used_elem.id].ndescs; last_used_chain =3D vhost_svq_last_desc_of_chain(svq, num, used_elem.i= d); svq->desc_next[last_used_chain] =3D svq->free_head; svq->free_head =3D used_elem.id; --=20 2.31.1