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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id E643CC43334 for ; Tue, 19 Jul 2022 10:15:57 +0000 (UTC) Received: from localhost ([::1]:34160 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oDkGi-0005ex-SH for qemu-devel@archiver.kernel.org; Tue, 19 Jul 2022 06:15:56 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:50396) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oDjym-00008o-DI for qemu-devel@nongnu.org; Tue, 19 Jul 2022 05:57:25 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:32623) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oDjyk-00059S-Ql for qemu-devel@nongnu.org; Tue, 19 Jul 2022 05:57:24 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1658224642; 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=4H+U8wSNcX4JZbeeKzhQcCq+VvtHuoOrUr7FSQWW5rA=; b=Me5tMIgm4Fdq2rwkeuCojejETd+BxNvMsFIvnapVWzrTz43AbMupv4+4oYeiaL/7aCIJa7 c++sJia/aspVr7HUG9ZGJNeaHpm6e43xtPfzixLOwtLIC3ajw9rYfJ/FgwMtYX7YkHJFYM U1RPKGfZ89C6G6x8GW1BZZ0yvMKtBhM= 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-20-kH2T91uQPPafsl-qpwMjKw-1; Tue, 19 Jul 2022 05:57:06 -0400 X-MC-Unique: kH2T91uQPPafsl-qpwMjKw-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 2FBA6101AA48; Tue, 19 Jul 2022 09:57:06 +0000 (UTC) Received: from eperezma.remote.csb (unknown [10.39.192.113]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4FDA218EA8; Tue, 19 Jul 2022 09:57:03 +0000 (UTC) From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= To: qemu-devel@nongnu.org Cc: Stefan Hajnoczi , Gautam Dawar , Liuxiangdong , Paolo Bonzini , Markus Armbruster , Jason Wang , Cornelia Huck , Parav Pandit , Eric Blake , "Michael S. Tsirkin" , Laurent Vivier , Zhu Lingshan , Eli Cohen , Cindy Lu , "Gonglei (Arei)" , Stefano Garzarella , Harpreet Singh Anand Subject: [PATCH v5 10/20] vhost: Track number of descs in SVQDescState Date: Tue, 19 Jul 2022 11:56:19 +0200 Message-Id: <20220719095629.3031338-11-eperezma@redhat.com> In-Reply-To: <20220719095629.3031338-1-eperezma@redhat.com> References: <20220719095629.3031338-1-eperezma@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" 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 Pérez --- 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-virtqueue.h index d646c35054..5c7e7cbab6 100644 --- a/hw/virtio/vhost-shadow-virtqueue.h +++ b/hw/virtio/vhost-shadow-virtqueue.h @@ -17,6 +17,12 @@ typedef struct SVQDescState { VirtQueueElement *elem; + + /* + * Number of descriptors exposed to the device. May or may not match + * guest's + */ + unsigned int ndescs; } SVQDescState; /* Shadow virtqueue to relay notifications */ diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-virtqueue.c index e4c09e2d88..8314405e01 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, const struct iovec *out_sg, } svq->desc_state[qemu_head].elem = elem; + svq->desc_state[qemu_head].ndescs = ndescs; vhost_svq_kick(svq); return 0; } @@ -418,8 +419,7 @@ static VirtQueueElement *vhost_svq_get_buf(VhostShadowVirtqueue *svq, return NULL; } - num = svq->desc_state[used_elem.id].elem->in_num + - svq->desc_state[used_elem.id].elem->out_num; + num = svq->desc_state[used_elem.id].ndescs; last_used_chain = vhost_svq_last_desc_of_chain(svq, num, used_elem.id); svq->desc_next[last_used_chain] = svq->free_head; svq->free_head = used_elem.id; -- 2.31.1