From patchwork Fri Sep 20 08:20:44 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Wang X-Patchwork-Id: 11153997 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 18C46195A for ; Fri, 20 Sep 2019 08:22:16 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 012AE2190F for ; Fri, 20 Sep 2019 08:22:16 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 012AE2190F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id B38186E81C; Fri, 20 Sep 2019 08:22:13 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by gabe.freedesktop.org (Postfix) with ESMTPS id CDCB86E81C; Fri, 20 Sep 2019 08:22:12 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 9CC0410DCC9D; Fri, 20 Sep 2019 08:22:11 +0000 (UTC) Received: from jason-ThinkPad-X1-Carbon-6th.redhat.com (ovpn-12-88.pek2.redhat.com [10.72.12.88]) by smtp.corp.redhat.com (Postfix) with ESMTP id 43D14101E67D; Fri, 20 Sep 2019 08:21:03 +0000 (UTC) From: Jason Wang To: kvm@vger.kernel.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org, kwankhede@nvidia.com, alex.williamson@redhat.com, mst@redhat.com, tiwei.bie@intel.com Subject: [RFC PATCH V2 0/6] mdev based hardware virtio offloading support Date: Fri, 20 Sep 2019 16:20:44 +0800 Message-Id: <20190920082050.19352-1-jasowang@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.6.2 (mx1.redhat.com [10.5.110.64]); Fri, 20 Sep 2019 08:22:12 +0000 (UTC) X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: sebott@linux.ibm.com, airlied@linux.ie, Jason Wang , heiko.carstens@de.ibm.com, virtualization@lists.linux-foundation.org, rob.miller@broadcom.com, lulu@redhat.com, eperezma@redhat.com, pasic@linux.ibm.com, borntraeger@de.ibm.com, haotian.wang@sifive.com, zhi.a.wang@intel.com, farman@linux.ibm.com, idos@mellanox.com, gor@linux.ibm.com, cunming.liang@intel.com, rodrigo.vivi@intel.com, xiao.w.wang@intel.com, freude@linux.ibm.com, zhihong.wang@intel.com, akrowiak@linux.ibm.com, pmorel@linux.ibm.com, netdev@vger.kernel.org, cohuck@redhat.com, oberpar@linux.ibm.com, maxime.coquelin@redhat.com, lingshan.zhu@intel.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Hi all: There are hardware that can do virtio datapath offloading while having its own control path. This path tries to implement a mdev based unified API to support using kernel virtio driver to drive those devices. This is done by introducing a new mdev transport for virtio (virtio_mdev) and register itself as a new kind of mdev driver. Then it provides a unified way for kernel virtio driver to talk with mdev device implementation. Though the series only contain kernel driver support, the goal is to make the transport generic enough to support userspace drivers. This means vhost-mdev[1] could be built on top as well by resuing the transport. A sample driver is also implemented which simulate a virito-net loopback ethernet device on top of vringh + workqueue. This could be used as a reference implementation for real hardware driver. Consider mdev framework only support VFIO device and driver right now, this series also extend it to support other types. This is done through introducing class id to the device and pairing it with id_talbe claimed by the driver. On top, this seris also decouple device specific parents ops out of the common ones. Pktgen test was done with virito-net + mvnet loop back device. Please review. Changes from V1: - rename device id to class id - add docs for class id and device specific ops (device_ops) - split device_ops into seperate headers - drop the mdev_set_dma_ops() - use device_ops to implement the transport API, then it's not a part of UAPI any more - use GFP_ATOMIC in mvnet sample device and other tweaks - set_vring_base/get_vring_base support for mvnet device Jason Wang (6): mdev: class id support mdev: introduce device specific ops mdev: introduce virtio device and its device ops virtio: introudce a mdev based transport vringh: fix copy direction of vringh_iov_push_kern() docs: Sample driver to demonstrate how to implement virtio-mdev framework .../driver-api/vfio-mediated-device.rst | 11 +- drivers/gpu/drm/i915/gvt/kvmgt.c | 17 +- drivers/s390/cio/vfio_ccw_ops.c | 17 +- drivers/s390/crypto/vfio_ap_ops.c | 14 +- drivers/vfio/mdev/Kconfig | 7 + drivers/vfio/mdev/Makefile | 1 + drivers/vfio/mdev/mdev_core.c | 21 +- drivers/vfio/mdev/mdev_driver.c | 14 + drivers/vfio/mdev/mdev_private.h | 1 + drivers/vfio/mdev/vfio_mdev.c | 37 +- drivers/vfio/mdev/virtio_mdev.c | 418 +++++++++++ drivers/vhost/vringh.c | 8 +- include/linux/mdev.h | 46 +- include/linux/mod_devicetable.h | 8 + include/linux/vfio_mdev.h | 50 ++ include/linux/virtio_mdev.h | 141 ++++ samples/Kconfig | 7 + samples/vfio-mdev/Makefile | 1 + samples/vfio-mdev/mbochs.c | 19 +- samples/vfio-mdev/mdpy.c | 19 +- samples/vfio-mdev/mtty.c | 17 +- samples/vfio-mdev/mvnet.c | 688 ++++++++++++++++++ 22 files changed, 1473 insertions(+), 89 deletions(-) create mode 100644 drivers/vfio/mdev/virtio_mdev.c create mode 100644 include/linux/vfio_mdev.h create mode 100644 include/linux/virtio_mdev.h create mode 100644 samples/vfio-mdev/mvnet.c