From patchwork Mon Mar 15 05:37:10 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yongji Xie X-Patchwork-Id: 12138315 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 E1484C433E9 for ; Mon, 15 Mar 2021 05:38:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B8B1D64E45 for ; Mon, 15 Mar 2021 05:38:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230039AbhCOFiK (ORCPT ); Mon, 15 Mar 2021 01:38:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49392 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229664AbhCOFhv (ORCPT ); Mon, 15 Mar 2021 01:37:51 -0400 Received: from mail-pl1-x636.google.com (mail-pl1-x636.google.com [IPv6:2607:f8b0:4864:20::636]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0EE89C061574 for ; Sun, 14 Mar 2021 22:37:51 -0700 (PDT) Received: by mail-pl1-x636.google.com with SMTP id q12so4253954plr.1 for ; Sun, 14 Mar 2021 22:37:51 -0700 (PDT) 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=nvQIToNG/wrtjBjWPrLmNKC6viXrmX1g7W+XEKqjc8Q=; b=G0OkTU3dvcANJhsKkY8h7+Gu2HmdKkHL79Fs+hLFkXcC/efJzrdY5hDHYcbWdD9gvF fY84/YUC1tLWw59OB4dwYmW4i6cBB8NPBOtwxl8BisBUgeDe6njXVgFeEtrV5qHoyKEs KSUcC7MDJQsrurKIMIkJgpJm4YWorVix8QBBAiY2KQXzVIyJhUWITHodOYnPflxP9sGQ +4UdNvmabaFtdwNBodzZCkKyvkSGrZl91NkdlustxzIArWzj8URQuIP2T/8I4ur/McWO oXgyC7IqEpKtjHuBMuaf4a47htbAyOAyInWIQhr1yDv8dimflQPATqr2eCTFLqwRCL1L zRhQ== 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=nvQIToNG/wrtjBjWPrLmNKC6viXrmX1g7W+XEKqjc8Q=; b=sKMpTxAJCc9EXC0mVU1joZWXR5XEhoNnjkGDi4GVvHaeVJGatK55BAq4gVVQ4LaZCP 0BtAhuKPcFM7UtaBqvMNlqoGmBlePxfTYvGySEPClQQuqtTowScig2FU8ulEQ1wwaVLn iu6KrryQGKge8viwKhWqcx9eVBMipzUOYG2r/AGtierYZPQPxVrbuyY1w9HuAVd8xM9W 0o89gTyTH5a1KhcmiXSqPVlyW28LDBzkApADAEcuQZMygbTBajknO75R+dO57jE0mAr8 5DgAAWoIiNjp1Z0byGAI83SdufsNSl5CsC4dCtaRbTDuoy0KesjxbDoyQVWLiaLZL2ac lxhA== X-Gm-Message-State: AOAM530HebfWKHHj75IPY+wOeMdezcQ43HeGegId10ULfZaOm2DuyYUI g9GGagGA33JNfDA/ult/YyFh X-Google-Smtp-Source: ABdhPJwuTrVy9ZhBwYi0VhgJ0THxjIUX5gHAZ1MQ0vpU86ObghdijG1plLHRs1ok1flhBXQobTEd2Q== X-Received: by 2002:a17:90a:281:: with SMTP id w1mr10510227pja.201.1615786670580; Sun, 14 Mar 2021 22:37:50 -0700 (PDT) Received: from localhost ([139.177.225.227]) by smtp.gmail.com with ESMTPSA id c193sm12549431pfc.180.2021.03.14.22.37.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 14 Mar 2021 22:37:50 -0700 (PDT) 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, mika.penttila@nextfour.com, dan.carpenter@oracle.com Cc: virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, kvm@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH v5 00/11] Introduce VDUSE - vDPA Device in Userspace Date: Mon, 15 Mar 2021 13:37:10 +0800 Message-Id: <20210315053721.189-1-xieyongji@bytedance.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org 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) V4 to V5: - Remove the patch for irq binding - Use a single IOTLB for all types of mapping - Factor out vhost_vdpa_pa_map() - Add some sample codes in document - Use receice_fd_user() to pass file descriptor - Fix some bugs 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): file: Export __receive_fd() to modules 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: factor out vhost_vdpa_pa_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 Documentation/userspace-api/index.rst | 1 + Documentation/userspace-api/ioctl/ioctl-number.rst | 1 + Documentation/userspace-api/vduse.rst | 209 ++++ 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 | 535 ++++++++ drivers/vdpa/vdpa_user/iova_domain.h | 75 ++ drivers/vdpa/vdpa_user/vduse_dev.c | 1303 ++++++++++++++++++++ drivers/vdpa/virtio_pci/vp_vdpa.c | 2 +- drivers/vhost/iotlb.c | 20 +- drivers/vhost/vdpa.c | 152 ++- fs/eventfd.c | 2 +- fs/file.c | 1 + include/linux/eventfd.h | 5 +- include/linux/vdpa.h | 21 +- include/linux/vhost_iotlb.h | 3 + include/uapi/linux/vduse.h | 156 +++ 22 files changed, 2469 insertions(+), 54 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