From patchwork Wed Jun 17 13:23:34 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kurz X-Patchwork-Id: 485427 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id BCC921400A0 for ; Wed, 17 Jun 2015 23:25:03 +1000 (AEST) Received: from localhost ([::1]:46817 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z5DKv-0003d8-Sh for incoming@patchwork.ozlabs.org; Wed, 17 Jun 2015 09:25:01 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41993) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z5DKA-0002Rt-5h for qemu-devel@nongnu.org; Wed, 17 Jun 2015 09:24:17 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Z5DK4-0003If-JN for qemu-devel@nongnu.org; Wed, 17 Jun 2015 09:24:14 -0400 Received: from e06smtp11.uk.ibm.com ([195.75.94.107]:38536) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Z5DK4-0003HG-9C for qemu-devel@nongnu.org; Wed, 17 Jun 2015 09:24:08 -0400 Received: from /spool/local by e06smtp11.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 17 Jun 2015 14:24:07 +0100 Received: from d06dlp02.portsmouth.uk.ibm.com (9.149.20.14) by e06smtp11.uk.ibm.com (192.168.101.141) with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted; Wed, 17 Jun 2015 14:24:05 +0100 X-Helo: d06dlp02.portsmouth.uk.ibm.com X-MailFrom: gkurz@linux.vnet.ibm.com X-RcptTo: qemu-devel@nongnu.org Received: from b06cxnps4074.portsmouth.uk.ibm.com (d06relay11.portsmouth.uk.ibm.com [9.149.109.196]) by d06dlp02.portsmouth.uk.ibm.com (Postfix) with ESMTP id DB40A219005F for ; Wed, 17 Jun 2015 14:23:43 +0100 (BST) Received: from d06av06.portsmouth.uk.ibm.com (d06av06.portsmouth.uk.ibm.com [9.149.37.217]) by b06cxnps4074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id t5HDO5fp24707090 for ; Wed, 17 Jun 2015 13:24:05 GMT Received: from d06av06.portsmouth.uk.ibm.com (localhost [127.0.0.1]) by d06av06.portsmouth.uk.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id t5H8HMf7016091 for ; Wed, 17 Jun 2015 04:17:22 -0400 Received: from smtp.lab.toulouse-stg.fr.ibm.com (srv01.lab.toulouse-stg.fr.ibm.com [9.101.4.1]) by d06av06.portsmouth.uk.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id t5H8HMKP016075; Wed, 17 Jun 2015 04:17:22 -0400 Received: from bahia.lab.toulouse-stg.fr.ibm.com (bahia.lab.toulouse-stg.fr.ibm.com [9.101.4.41]) by smtp.lab.toulouse-stg.fr.ibm.com (Postfix) with ESMTP id 4E6A6220975; Wed, 17 Jun 2015 15:23:34 +0200 (CEST) From: Greg Kurz To: "Michael S. Tsirkin" Date: Wed, 17 Jun 2015 15:23:34 +0200 Message-ID: <20150617132334.6560.46459.stgit@bahia.lab.toulouse-stg.fr.ibm.com> In-Reply-To: <20150617132323.6560.29432.stgit@bahia.lab.toulouse-stg.fr.ibm.com> References: <20150617132323.6560.29432.stgit@bahia.lab.toulouse-stg.fr.ibm.com> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 15061713-0041-0000-0000-000004CC8397 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 195.75.94.107 Cc: Cornelia Huck , Thomas Huth , qemu-devel@nongnu.org, Stefan Hajnoczi , Jason Wang Subject: [Qemu-devel] [PATCH 2/6] virtio: introduce virtio_legacy_is_cross_endian() X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org This helper will be used by vhost and tap to detect cross-endianness in the legacy virtio case. Signed-off-by: Greg Kurz --- include/hw/virtio/virtio-access.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/include/hw/virtio/virtio-access.h b/include/hw/virtio/virtio-access.h index ee28c21fefed..cee5dd70c997 100644 --- a/include/hw/virtio/virtio-access.h +++ b/include/hw/virtio/virtio-access.h @@ -32,6 +32,19 @@ static inline bool virtio_access_is_big_endian(VirtIODevice *vdev) #endif } +static inline bool virtio_legacy_is_cross_endian(VirtIODevice *vdev) +{ +#ifdef TARGET_IS_BIENDIAN +#ifdef HOST_WORDS_BIGENDIAN + return !virtio_is_big_endian(vdev); +#else + return virtio_is_big_endian(vdev); +#endif +#else + return false; +#endif +} + static inline uint16_t virtio_lduw_phys(VirtIODevice *vdev, hwaddr pa) { if (virtio_access_is_big_endian(vdev)) {