From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752881AbbDBNQq (ORCPT ); Thu, 2 Apr 2015 09:16:46 -0400 Received: from e06smtp14.uk.ibm.com ([195.75.94.110]:43211 "EHLO e06smtp14.uk.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751721AbbDBNQn (ORCPT ); Thu, 2 Apr 2015 09:16:43 -0400 Subject: [PATCH v2 0/7] vhost: support for cross endian guests From: Greg Kurz To: Rusty Russell , "Michael S. Tsirkin" Cc: linux-api@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org Date: Thu, 02 Apr 2015 15:16:37 +0200 Message-ID: <20150402131637.24676.60700.stgit@bahia.lab.toulouse-stg.fr.ibm.com> User-Agent: StGit/0.17-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 15040213-0017-0000-0000-000003974913 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, This patchset allows vhost to be used with legacy virtio when guest and host have a different endianness. It is a complete rework of my initial post. Patches 1 to 5 are preliminary work: we move the endianness check out of all memory accessors to separate functions. Patch 6 changes the semantics of the accessors so that they have explicit big endian support. Patch 7 brings the cross-endian feature, with the following changes since v1: - conditionnal enablement through a kernel config - introduction of a new vhost feature to advertise cross-endian to userspace The tentative to fix vnet headers was dropped for the moment. As a consequnce, vhost_net still fails to work with cross-endian. It will be fixed in another patchset I'm currently working on. --- Greg Kurz (7): virtio: introduce virtio_is_little_endian() helper tun: add tun_is_little_endian() helper macvtap: introduce macvtap_is_little_endian() helper vringh: introduce vringh_is_little_endian() helper vhost: introduce vhost_is_little_endian() helper virtio: add explicit big-endian support to memory accessors vhost: feature to set the vring endianness drivers/net/macvtap.c | 11 +++++++++-- drivers/net/tun.c | 11 +++++++++-- drivers/vhost/Kconfig | 10 ++++++++++ drivers/vhost/net.c | 5 +++++ drivers/vhost/scsi.c | 4 ++++ drivers/vhost/test.c | 4 ++++ drivers/vhost/vhost.c | 19 +++++++++++++++++++ drivers/vhost/vhost.h | 32 +++++++++++++++++++++++++------- include/linux/virtio_byteorder.h | 24 ++++++++++++++---------- include/linux/virtio_config.h | 19 +++++++++++++------ include/linux/vringh.h | 19 +++++++++++++------ include/uapi/linux/vhost.h | 10 ++++++++++ 12 files changed, 135 insertions(+), 33 deletions(-) -- Greg