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 X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 25567C32750 for ; Tue, 13 Aug 2019 10:30:27 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id F1AC920840 for ; Tue, 13 Aug 2019 10:30:26 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F1AC920840 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:50946 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hxU4Q-0004aX-9E for qemu-devel@archiver.kernel.org; Tue, 13 Aug 2019 06:30:26 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:34950) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hxU3n-0003Ip-5l for qemu-devel@nongnu.org; Tue, 13 Aug 2019 06:29:48 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hxU3m-0007Vd-7s for qemu-devel@nongnu.org; Tue, 13 Aug 2019 06:29:47 -0400 Received: from mx1.redhat.com ([209.132.183.28]:45018) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hxU3m-0007VC-2j for qemu-devel@nongnu.org; Tue, 13 Aug 2019 06:29:46 -0400 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 mx1.redhat.com (Postfix) with ESMTPS id 66E3F308213F; Tue, 13 Aug 2019 10:29:45 +0000 (UTC) Received: from dgilbert-t580.localhost (ovpn-117-72.ams2.redhat.com [10.36.117.72]) by smtp.corp.redhat.com (Postfix) with ESMTP id 642CE794C4; Tue, 13 Aug 2019 10:29:44 +0000 (UTC) From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, pbonzini@redhat.com, mst@redhat.com Date: Tue, 13 Aug 2019 11:29:36 +0100 Message-Id: <20190813102936.32195-3-dgilbert@redhat.com> In-Reply-To: <20190813102936.32195-1-dgilbert@redhat.com> References: <20190813102936.32195-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.42]); Tue, 13 Aug 2019 10:29:45 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH 2/2] vhost: Fix memory region section comparison X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: "Dr. David Alan Gilbert" Using memcmp to compare structures wasn't safe, as I found out on ARM when I was getting false miscompares. Use the helper function for comparing the MRSs. Fixes: ade6d081fc33948e56e6 Signed-off-by: Dr. David Alan Gilbert --- hw/virtio/vhost.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c index bc899fc60e..2ef4bc720f 100644 --- a/hw/virtio/vhost.c +++ b/hw/virtio/vhost.c @@ -451,8 +451,13 @@ static void vhost_commit(MemoryListener *listener) changed =3D true; } else { /* Same size, lets check the contents */ - changed =3D n_old_sections && memcmp(dev->mem_sections, old_sect= ions, - n_old_sections * sizeof(old_sections[0])) !=3D = 0; + for (int i =3D 0; i < n_old_sections; i++) { + if (!MemoryRegionSection_eq(&old_sections[i], + &dev->mem_sections[i])) { + changed =3D true; + break; + } + } } =20 trace_vhost_commit(dev->started, changed); --=20 2.21.0