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From: Yongji Xie <xieyongji@bytedance.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: "Jason Wang" <jasowang@redhat.com>,
	"Stefan Hajnoczi" <stefanha@redhat.com>,
	"Stefano Garzarella" <sgarzare@redhat.com>,
	"Parav Pandit" <parav@nvidia.com>,
	"Christoph Hellwig" <hch@infradead.org>,
	"Christian Brauner" <christian.brauner@canonical.com>,
	"Randy Dunlap" <rdunlap@infradead.org>,
	"Matthew Wilcox" <willy@infradead.org>,
	viro@zeniv.linux.org.uk, "Jens Axboe" <axboe@kernel.dk>,
	bcrl@kvack.org, "Jonathan Corbet" <corbet@lwn.net>,
	"Mika Penttilä" <mika.penttila@nextfour.com>,
	"Dan Carpenter" <dan.carpenter@oracle.com>,
	virtualization@lists.linux-foundation.org,
	netdev@vger.kernel.org, kvm@vger.kernel.org,
	linux-fsdevel@vger.kernel.org
Subject: Re: Re: [PATCH v6 00/10] Introduce VDUSE - vDPA Device in Userspace
Date: Wed, 14 Apr 2021 15:54:51 +0800	[thread overview]
Message-ID: <CACycT3tRjTRJr1aQhtHK_K1MJd07ki8bnR9mYPRb8oQ8vVuxDQ@mail.gmail.com> (raw)
In-Reply-To: <20210414032909-mutt-send-email-mst@kernel.org>

On Wed, Apr 14, 2021 at 3:35 PM Michael S. Tsirkin <mst@redhat.com> wrote:
>
> On Wed, Mar 31, 2021 at 04:05:09PM +0800, Xie Yongji wrote:
> > 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 |
> >                                                                                    -------------------
>
> This all looks quite similar to vhost-user-block except that one
> does not need any kernel support at all.
>
> So I am still scratching my head about its advantages over
> vhost-user-block.
>

It plays the same role as vhost-user-block in VM user cases.

>
> > 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.
>
> Maybe the container part is the answer. How does that stack look?
>

Yes, it enables containers to reuse virtio software stack. We can have
one daemon that provides service to both containers and virtual
machines.

Thanks，
Yongji

      parent reply	other threads:[~2021-04-14  7:55 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-31  8:05 [PATCH v6 00/10] Introduce VDUSE - vDPA Device in Userspace Xie Yongji
2021-03-31  8:05 ` [PATCH v6 01/10] file: Export receive_fd() to modules Xie Yongji
2021-03-31  9:15   ` Christian Brauner
2021-03-31  9:26     ` Dan Carpenter
2021-03-31  9:28       ` Christian Brauner
2021-03-31 11:32     ` Yongji Xie
2021-03-31 12:23       ` Christian Brauner
2021-03-31 13:59         ` Yongji Xie
2021-03-31 14:07           ` Christian Brauner
2021-03-31 14:37             ` Yongji Xie
2021-03-31  8:05 ` [PATCH v6 02/10] eventfd: Increase the recursion depth of eventfd_signal() Xie Yongji
2021-03-31  8:05 ` [PATCH v6 03/10] vhost-vdpa: protect concurrent access to vhost device iotlb Xie Yongji
2021-04-09 16:15   ` Michael S. Tsirkin
2021-04-11  5:36     ` Yongji Xie
2021-04-11 20:48       ` Michael S. Tsirkin
2021-04-12  2:29         ` Yongji Xie
2021-04-12  9:00           ` Michael S. Tsirkin
2021-03-31  8:05 ` [PATCH v6 04/10] vhost-iotlb: Add an opaque pointer for vhost IOTLB Xie Yongji
2021-03-31  8:05 ` [PATCH v6 05/10] vdpa: Add an opaque pointer for vdpa_config_ops.dma_map() Xie Yongji
2021-03-31  8:05 ` [PATCH v6 06/10] vdpa: factor out vhost_vdpa_pa_map() and vhost_vdpa_pa_unmap() Xie Yongji
2021-03-31  8:05 ` [PATCH v6 07/10] vdpa: Support transferring virtual addressing during DMA mapping Xie Yongji
2021-04-08  2:36   ` Jason Wang
2021-03-31  8:05 ` [PATCH v6 08/10] vduse: Implement an MMU-based IOMMU driver Xie Yongji
2021-04-08  3:25   ` Jason Wang
2021-04-08  5:27     ` Yongji Xie
2021-03-31  8:05 ` [PATCH v6 09/10] vduse: Introduce VDUSE - vDPA Device in Userspace Xie Yongji
2021-04-08  6:57   ` Jason Wang
2021-04-08  9:36     ` Yongji Xie
2021-04-09  5:36       ` Jason Wang
2021-04-09  8:02         ` Yongji Xie
2021-04-12  7:16           ` Jason Wang
2021-04-12  8:02             ` Yongji Xie
2021-04-12  9:37               ` Jason Wang
2021-04-12  9:59                 ` Yongji Xie
2021-04-13  3:35                   ` Jason Wang
2021-04-13  4:28                     ` Yongji Xie
2021-04-14  8:18                       ` Jason Wang
2021-04-16  3:24   ` Jason Wang
2021-04-16  8:43     ` Yongji Xie
2021-03-31  8:05 ` [PATCH v6 10/10] Documentation: Add documentation for VDUSE Xie Yongji
2021-04-08  7:18   ` Jason Wang
2021-04-08  8:09     ` Yongji Xie
2021-04-14 14:14   ` Stefan Hajnoczi
2021-04-15  5:38     ` Yongji Xie
2021-04-15  7:19       ` Stefan Hajnoczi
2021-04-15  8:33         ` Yongji Xie
2021-04-15 14:17           ` Stefan Hajnoczi
2021-04-15  8:36         ` Jason Wang
2021-04-15  9:04           ` Jason Wang
2021-04-15 11:17             ` Yongji Xie
2021-04-16  2:20               ` Jason Wang
2021-04-16  2:58                 ` Yongji Xie
2021-04-16  3:02                   ` Jason Wang
2021-04-16  3:18                     ` Yongji Xie
2021-04-15 14:38           ` Stefan Hajnoczi
2021-04-16  2:23             ` Jason Wang
2021-04-16  3:19               ` Yongji Xie
2021-04-16  5:39                 ` Jason Wang
2021-04-16  3:13             ` Yongji Xie
2021-04-14  7:34 ` [PATCH v6 00/10] Introduce VDUSE - vDPA Device in Userspace Michael S. Tsirkin
2021-04-14  7:49   ` Jason Wang
2021-04-14  7:54   ` Yongji Xie [this message]

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