From patchwork Tue Feb 23 11:50:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yongji Xie X-Patchwork-Id: 12100225 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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 4AFECC433E6 for ; Tue, 23 Feb 2021 11:53:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F353A64E31 for ; Tue, 23 Feb 2021 11:53:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232491AbhBWLwz (ORCPT ); Tue, 23 Feb 2021 06:52:55 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51726 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232468AbhBWLw1 (ORCPT ); Tue, 23 Feb 2021 06:52:27 -0500 Received: from mail-pl1-x62e.google.com (mail-pl1-x62e.google.com [IPv6:2607:f8b0:4864:20::62e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 80790C061786 for ; Tue, 23 Feb 2021 03:51:46 -0800 (PST) Received: by mail-pl1-x62e.google.com with SMTP id a24so9653494plm.11 for ; Tue, 23 Feb 2021 03:51:46 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=Xdz76Pr5X2U4qGHNaBUqTnUQFn7wjtLgR16d6odDiDY=; b=KqAJzp4Ub9NgdWZX0Vx+kHhWD2qcuxAU6AlaIr1cTEa34WXruEbOqzAduVnsyuTiVq Qrj6vhsW64HXdsYLwgt1DG1lA+9TBfZc692wNCowM9cPgj7jJnYpvmm/cvgJvHoJExvV Xxv9RFF5PRqatMwzSs7jXOqar4QnqNbmRljz1DSrtU5dIG0PRZ6lgyriHVoG9LQCpKAG CPGyxiEwaf+JQABA6jerjDMlAAj+c7c0yRibE9YyayEvUVlVTFEnuSSb1M8pu50stbnL LGbS+/8NrESm09jnrN+7TNWR7JMY7D24qOMgkvxMbUPorHkxamXnkMMD8Ks3aGu/oSOZ kaUw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=Xdz76Pr5X2U4qGHNaBUqTnUQFn7wjtLgR16d6odDiDY=; b=skQ5mMp0EH/xypogKC2Ogf7kcoBz5AHeO0oztcIcf+fVo4Z7Ruphmjalt7kxKSg+lb CLFVih07n5u+ZqGFKrP9PiU2cjWx2eH1XVO/ktceQ+riz0ubLo8JtxTymsd16IqBe5sQ T335GOIFjlA0EOmZ8zk1mMJKVNrFKDc+6Ah9cKyrw4GTRzvdmAG4PJa5tv3EYr/fu/wQ zo1cMPEFcV0HY8pG/hGKutotUmsfwRUOqtvnb+zN7MX6fTJ3vkaWsoLbV8MBtpcG9VNU Ht1vtBCvnw7iJGsNrGDuyDwdQtprOpTqvA0NWClSglu58lnrr87/t4okd01WWn7PUCXQ bmgQ== X-Gm-Message-State: AOAM531kD/LWkQ1gLOp7OB3nn47uiuPh8cxcwC1Lpy+ZCfG/yPfxQ/j5 CtwEqrFPcP19uc56++XZu/4y X-Google-Smtp-Source: ABdhPJz+79mE6shXBsPb0acvIFtMPBgzHOe2E85ktwi8FRo2C3PHXFv0KX2CxiJB+oN/aw8FRop8mg== X-Received: by 2002:a17:90a:ba02:: with SMTP id s2mr29110785pjr.53.1614081105834; Tue, 23 Feb 2021 03:51:45 -0800 (PST) Received: from localhost ([139.177.225.253]) by smtp.gmail.com with ESMTPSA id ca19sm3086493pjb.31.2021.02.23.03.51.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 23 Feb 2021 03:51:45 -0800 (PST) From: Xie Yongji To: mst@redhat.com, jasowang@redhat.com, stefanha@redhat.com, sgarzare@redhat.com, parav@nvidia.com, bob.liu@oracle.com, hch@infradead.org, rdunlap@infradead.org, willy@infradead.org, viro@zeniv.linux.org.uk, axboe@kernel.dk, bcrl@kvack.org, corbet@lwn.net Cc: virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, kvm@vger.kernel.org, linux-aio@kvack.org, linux-fsdevel@vger.kernel.org Subject: [RFC v4 00/11] Introduce VDUSE - vDPA Device in Userspace Date: Tue, 23 Feb 2021 19:50:37 +0800 Message-Id: <20210223115048.435-1-xieyongji@bytedance.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-State: RFC This series introduces a framework, which can be used to implement vDPA Devices in a userspace program. The work consist of two parts: control path forwarding and data path offloading. In the control path, the VDUSE driver will make use of message mechnism to forward the config operation from vdpa bus driver to userspace. Userspace can use read()/write() to receive/reply those control messages. In the data path, the core is mapping dma buffer into VDUSE daemon's address space, which can be implemented in different ways depending on the vdpa bus to which the vDPA device is attached. In virtio-vdpa case, we implements a MMU-based on-chip IOMMU driver with bounce-buffering mechanism to achieve that. And in vhost-vdpa case, the dma buffer is reside in a userspace memory region which can be shared to the VDUSE userspace processs via transferring the shmfd. The details and our user case is shown below: ------------------------ ------------------------- ---------------------------------------------- | Container | | QEMU(VM) | | VDUSE daemon | | --------- | | ------------------- | | ------------------------- ---------------- | | |dev/vdx| | | |/dev/vhost-vdpa-x| | | | vDPA device emulation | | block driver | | ------------+----------- -----------+------------ -------------+----------------------+--------- | | | | | | | | ------------+---------------------------+----------------------------+----------------------+--------- | | block device | | vhost device | | vduse driver | | TCP/IP | | | -------+-------- --------+-------- -------+-------- -----+---- | | | | | | | | ----------+---------- ----------+----------- -------+------- | | | | virtio-blk driver | | vhost-vdpa driver | | vdpa device | | | | ----------+---------- ----------+----------- -------+------- | | | | virtio bus | | | | | --------+----+----------- | | | | | | | | | | | ----------+---------- | | | | | | virtio-blk device | | | | | | ----------+---------- | | | | | | | | | | | -----------+----------- | | | | | | virtio-vdpa driver | | | | | | -----------+----------- | | | | | | | | vdpa bus | | | -----------+----------------------+---------------------------+------------ | | | ---+--- | -----------------------------------------------------------------------------------------| NIC |------ ---+--- | ---------+--------- | Remote Storages | ------------------- We make use of it to implement a block device connecting to our distributed storage, which can be used both in containers and VMs. Thus, we can have an unified technology stack in this two cases. To test it with null-blk: $ qemu-storage-daemon \ --chardev socket,id=charmonitor,path=/tmp/qmp.sock,server,nowait \ --monitor chardev=charmonitor \ --blockdev driver=host_device,cache.direct=on,aio=native,filename=/dev/nullb0,node-name=disk0 \ --export type=vduse-blk,id=test,node-name=disk0,writable=on,name=vduse-null,num-queues=16,queue-size=128 The qemu-storage-daemon can be found at https://github.com/bytedance/qemu/tree/vduse Future work: - Improve performance - Userspace library (find a way to reuse device emulation code in qemu/rust-vmm) V3 to V4: - Rebase to vhost.git - Split some patches - Add some documents - Use ioctl to inject interrupt rather than eventfd - Enable config interrupt support - Support binding irq to the specified cpu - Add two module parameter to limit bounce/iova size - Create char device rather than anon inode per vduse - Reuse vhost IOTLB for iova domain - Rework the message mechnism in control path V2 to V3: - Rework the MMU-based IOMMU driver - Use the iova domain as iova allocator instead of genpool - Support transferring vma->vm_file in vhost-vdpa - Add SVA support in vhost-vdpa - Remove the patches on bounce pages reclaim V1 to V2: - Add vhost-vdpa support - Add some documents - Based on the vdpa management tool - Introduce a workqueue for irq injection - Replace interval tree with array map to store the iova_map Xie Yongji (11): eventfd: Increase the recursion depth of eventfd_signal() vhost-vdpa: protect concurrent access to vhost device iotlb vhost-iotlb: Add an opaque pointer for vhost IOTLB vdpa: Add an opaque pointer for vdpa_config_ops.dma_map() vdpa: Support transferring virtual addressing during DMA mapping vduse: Implement an MMU-based IOMMU driver vduse: Introduce VDUSE - vDPA Device in Userspace vduse: Add config interrupt support Documentation: Add documentation for VDUSE vduse: Introduce a workqueue for irq injection vduse: Support binding irq to the specified cpu Documentation/userspace-api/index.rst | 1 + Documentation/userspace-api/ioctl/ioctl-number.rst | 1 + Documentation/userspace-api/vduse.rst | 112 ++ drivers/vdpa/Kconfig | 10 + drivers/vdpa/Makefile | 1 + drivers/vdpa/ifcvf/ifcvf_main.c | 2 +- drivers/vdpa/mlx5/net/mlx5_vnet.c | 2 +- drivers/vdpa/vdpa.c | 9 +- drivers/vdpa/vdpa_sim/vdpa_sim.c | 8 +- drivers/vdpa/vdpa_user/Makefile | 5 + drivers/vdpa/vdpa_user/iova_domain.c | 486 +++++++ drivers/vdpa/vdpa_user/iova_domain.h | 61 + drivers/vdpa/vdpa_user/vduse_dev.c | 1399 ++++++++++++++++++++ drivers/vhost/iotlb.c | 20 +- drivers/vhost/vdpa.c | 106 +- fs/eventfd.c | 2 +- include/linux/eventfd.h | 5 +- include/linux/vdpa.h | 22 +- include/linux/vhost_iotlb.h | 3 + include/uapi/linux/vduse.h | 144 ++ 20 files changed, 2363 insertions(+), 36 deletions(-) create mode 100644 Documentation/userspace-api/vduse.rst create mode 100644 drivers/vdpa/vdpa_user/Makefile create mode 100644 drivers/vdpa/vdpa_user/iova_domain.c create mode 100644 drivers/vdpa/vdpa_user/iova_domain.h create mode 100644 drivers/vdpa/vdpa_user/vduse_dev.c create mode 100644 include/uapi/linux/vduse.h