From patchwork Wed Mar 31 08:05:09 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yongji Xie X-Patchwork-Id: 12174633 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 8A174C433DB for ; Wed, 31 Mar 2021 08:07:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4BF73619D6 for ; Wed, 31 Mar 2021 08:07:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234282AbhCaIGs (ORCPT ); Wed, 31 Mar 2021 04:06:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47338 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233838AbhCaIGS (ORCPT ); Wed, 31 Mar 2021 04:06:18 -0400 Received: from mail-pj1-x102a.google.com (mail-pj1-x102a.google.com [IPv6:2607:f8b0:4864:20::102a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 393A8C061574 for ; Wed, 31 Mar 2021 01:06:18 -0700 (PDT) Received: by mail-pj1-x102a.google.com with SMTP id ot17-20020a17090b3b51b0290109c9ac3c34so749552pjb.4 for ; Wed, 31 Mar 2021 01:06:18 -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=4N6n75HqbevIF9P31f/wL6cRPYdbdVgQRyq4EjDa+KI=; b=tCWBRhkJ+EMcbHANy2T6J/ODxrDT3eHPzebAt+W99iL0z7gvXjr48gyg9qUrY139C2 5eDG6B4sUzPt56VJiOE+FaH1N17gORJp/oo5tKe3M7lzZFYVw/t7wciBddhPOnZOQWtC LAZWYSlVDKcL6rvBWxeTUjWw+l09aCIfcgzIqJ0TBjD7cNcXivLhdHyDcmIlDCB1GjYO L6CbDMLkz6QhZGZm3/4LTAWxrsNh6fb9y7Rmhvs5IDPTPwG+yBt6moLP2iWKVgLoDZSd EX0FqybXvVmaUAKcJcLct764h//QocjnI69D5oC1ZIUUcEwQcL0uGvx2/WZlUQ7zucjQ JNJw== 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=4N6n75HqbevIF9P31f/wL6cRPYdbdVgQRyq4EjDa+KI=; b=CgvqK8+PSsNM0nZR16JA0PTp3rckM4JX4o5/T81G1edvpYDMGGlP4mpzsuN9NX6P80 z7kRb9dQLVKhE6EKAg3fmsIlAwxCYPzvhuMLFpVMmH9BczOASu67SxO9ArQuyiMRDh/G 5oqtNnbVPDcDImaW+PFreFxGa+P37hAZtUmunAyLB+7ukt9ESn2QVu8KfA0H9mlkQFoG e8a0bMnc8W35k3tHqpZ2ApHLv50I9Rp0c1x4Ge/izzhqMLriuk1MSqwLF8LOU3CDaZiu PsBP+JO6JmMLRj6KrBLDjhZqlGz+I6j++7CwJEo0kx/Uoh+9+5YSBWM2O+SINKxri01f GM4w== X-Gm-Message-State: AOAM531WuS9KQVztEz3+UEkjPhP1QFxjQ6Apv6SpNO0xOCfqhbuSf52M e0TT65h6YFb/gKU/ctjIpeS+ X-Google-Smtp-Source: ABdhPJwXQhHmzbJYidBqa/tnGY3/zsxMlrVA/10Pbl0dBxMOuwslgXGwHsV1vdv1saXvtLPHhYcpmQ== X-Received: by 2002:a17:903:22c1:b029:e7:1f29:b848 with SMTP id y1-20020a17090322c1b02900e71f29b848mr2100012plg.53.1617177977718; Wed, 31 Mar 2021 01:06:17 -0700 (PDT) Received: from localhost ([139.177.225.243]) by smtp.gmail.com with ESMTPSA id a22sm1731081pgw.52.2021.03.31.01.06.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 31 Mar 2021 01:06:17 -0700 (PDT) From: Xie Yongji To: mst@redhat.com, jasowang@redhat.com, stefanha@redhat.com, sgarzare@redhat.com, parav@nvidia.com, hch@infradead.org, christian.brauner@canonical.com, 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 v6 00/10] Introduce VDUSE - vDPA Device in Userspace Date: Wed, 31 Mar 2021 16:05:09 +0800 Message-Id: <20210331080519.172-1-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) V5 to V6: - Export receive_fd() instead of __receive_fd() - Factor out the unmapping logic of pa and va separatedly - Remove the logic of bounce page allocation in page fault handler - Use PAGE_SIZE as IOVA allocation granule - Add EPOLLOUT support - Enable setting API version in userspace - Fix some bugs 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 (10): 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() and vhost_vdpa_pa_unmap() vdpa: Support transferring virtual addressing during DMA mapping vduse: Implement an MMU-based IOMMU driver vduse: Introduce VDUSE - vDPA Device in Userspace Documentation: Add documentation for VDUSE Documentation/userspace-api/index.rst | 1 + Documentation/userspace-api/ioctl/ioctl-number.rst | 1 + Documentation/userspace-api/vduse.rst | 212 +++ 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 | 521 ++++++++ drivers/vdpa/vdpa_user/iova_domain.h | 70 + drivers/vdpa/vdpa_user/vduse_dev.c | 1362 ++++++++++++++++++++ drivers/vdpa/virtio_pci/vp_vdpa.c | 2 +- drivers/vhost/iotlb.c | 20 +- drivers/vhost/vdpa.c | 154 ++- fs/eventfd.c | 2 +- fs/file.c | 6 + include/linux/eventfd.h | 5 +- include/linux/file.h | 7 +- include/linux/vdpa.h | 21 +- include/linux/vhost_iotlb.h | 3 + include/uapi/linux/vduse.h | 175 +++ 23 files changed, 2548 insertions(+), 51 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