From patchwork Fri Nov 20 18:51:03 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Eugenio Perez Martin X-Patchwork-Id: 11921995 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=-15.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 079DBC56201 for ; Fri, 20 Nov 2020 18:57:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A26E122470 for ; Fri, 20 Nov 2020 18:57:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="gfix5mH5" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730021AbgKTS5b (ORCPT ); Fri, 20 Nov 2020 13:57:31 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:23964 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729047AbgKTS5b (ORCPT ); Fri, 20 Nov 2020 13:57:31 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1605898649; 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=7NFTh5Kxb25Zit2Z09Dwayle5qrijF2SdCF72+OTF/8=; b=gfix5mH5ZtIhEDttf1Nc39m62DMRNKcOa2PG1Nz0KfublSxjHt8eHpnX3smXr+q8gbAc5K 4/3zih0zMo7X5q/69dCsW2F+yQZCMJgYVZYq84w9fZnCJ/0wqtYWwsB62tvtlffzsV2itT J9qiLABP/TaLDecvqNePfKck3EwJR2Y= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-111-APAVSU7rNfasUb3rHao7YA-1; Fri, 20 Nov 2020 13:57:26 -0500 X-MC-Unique: APAVSU7rNfasUb3rHao7YA-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 77F0D801B19; Fri, 20 Nov 2020 18:57:23 +0000 (UTC) Received: from eperezma.remote.csb (ovpn-112-88.ams2.redhat.com [10.36.112.88]) by smtp.corp.redhat.com (Postfix) with ESMTP id 571CD5C1D5; Fri, 20 Nov 2020 18:57:14 +0000 (UTC) From: =?utf-8?q?Eugenio_P=C3=A9rez?= To: qemu-devel@nongnu.org Cc: Lars Ganrot , virtualization@lists.linux-foundation.org, Salil Mehta , "Michael S. Tsirkin" , Liran Alon , Rob Miller , Max Gurtovoy , Alex Barba , Stefan Hajnoczi , Jim Harford , Jason Wang , Harpreet Singh Anand , Christophe Fontaine , vm , Daniel Daly , Michael Lilja , Stefano Garzarella , Nitin Shrivastav , Lee Ballard , Dmytro Kazantsev , Juan Quintela , kvm@vger.kernel.org, Howard Cai , Xiao W Wang , Sean Mooney , Parav Pandit , Eli Cohen , Siwei Liu , Stephen Finucane Subject: [RFC PATCH 25/27] vhost: Do not commit vhost used idx on vhost_virtqueue_stop Date: Fri, 20 Nov 2020 19:51:03 +0100 Message-Id: <20201120185105.279030-26-eperezma@redhat.com> In-Reply-To: <20201120185105.279030-1-eperezma@redhat.com> References: <20201120185105.279030-1-eperezma@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org ... if sw lm is enabled Signed-off-by: Eugenio Pérez --- hw/virtio/vhost.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c index cb44b9997f..cf000b979f 100644 --- a/hw/virtio/vhost.c +++ b/hw/virtio/vhost.c @@ -1424,17 +1424,22 @@ static void vhost_virtqueue_stop(struct vhost_dev *dev, struct vhost_vring_state state = { .index = vhost_vq_index, }; - int r; + int r = -1; if (virtio_queue_get_desc_addr(vdev, idx) == 0) { /* Don't stop the virtqueue which might have not been started */ return; } - r = dev->vhost_ops->vhost_get_vring_base(dev, &state); - if (r < 0) { - VHOST_OPS_DEBUG("vhost VQ %u ring restore failed: %d", idx, r); - /* Connection to the backend is broken, so let's sync internal + if (!dev->sw_lm_enabled) { + r = dev->vhost_ops->vhost_get_vring_base(dev, &state); + if (r < 0) { + VHOST_OPS_DEBUG("vhost VQ %u ring restore failed: %d", idx, r); + } + } + + if (!dev->sw_lm_enabled || r < 0) { + /* Connection to the backend is unusable, so let's sync internal * last avail idx to the device used idx. */ virtio_queue_restore_last_avail_idx(vdev, idx);