Re: [PATCH v5 0/4] Virtio shared dma-buf

[Albert Esteve <aesteve@redhat.com>]

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Hi all,

A little bump for this patch, sorry for the extra noise.

Regards,
Albert


On Wed, Aug 2, 2023 at 11:08 AM Albert Esteve <aesteve@redhat.com> wrote:

> v1 link ->
> https://lists.gnu.org/archive/html/qemu-devel/2023-05/msg00598.html
> v2 link ->
> https://lists.gnu.org/archive/html/qemu-devel/2023-05/msg04530.html
> v3 link ->
> https://lists.gnu.org/archive/html/qemu-devel/2023-05/msg06126.html
> v4 link ->
> https://lists.gnu.org/archive/html/qemu-devel/2023-06/msg05174.html
> v4 -> v5:
> - Allow shared table to hold pointers for vhost devices, in a struct that
> defines the types that the table can store
> - New message VHOST_USER_GET_SHARED_OBJECT to retrieve objects stored in
> vhost backends
> - Minor additions to support the previous items (e.g. new test usecases).
>
> This patch covers the required steps to add support for virtio
> cross-device resource sharing[1],
> which support is already available in the kernel.
>
> The main usecase will be sharing dma buffers from virtio-gpu devices (as
> the exporter
> -see VIRTIO_GPU_CMD_RESOURCE_ASSIGN_UUID in [2]), to virtio-video (under
> discussion)
> devices (as the buffer-user or importer). Therefore, even though virtio
> specs talk about
> resources or objects[3], this patch adds the infrastructure with dma-bufs
> in mind.
> Note that virtio specs let the devices themselves define what a vitio
> object is.
>
> These are the main parts that are covered in the patch:
>
> - Add hash function to uuid module
> - Shared resources table, to hold all resources that can be shared in the
> host and their assigned UUID,
>   or pointers to the backend holding the resource
> - Internal shared table API for virtio devices to add, lookup and remove
> resources
> - Unit test to verify the API
> - New messages to the vhost-user protocol to allow backend to interact
> with the shared
>   table API through the control socket
> - New vhost-user feature bit to enable shared objects feature
>
> Applies cleanly to 38a6de80b917b2a822cff0e38d83563ab401c890
>
> [1] - https://lwn.net/Articles/828988/
> [2] -
> https://docs.oasis-open.org/virtio/virtio/v1.2/csd01/virtio-v1.2-csd01.html#x1-3730006
> [3] -
> https://docs.oasis-open.org/virtio/virtio/v1.2/csd01/virtio-v1.2-csd01.html#x1-10500011
>
> Albert Esteve (4):
>   uuid: add a hash function
>   virtio-dmabuf: introduce virtio-dmabuf
>   vhost-user: add shared_object msg
>   vhost-user: refactor send_resp code
>
>  MAINTAINERS                               |   7 +
>  docs/interop/vhost-user.rst               |  57 +++++++
>  hw/display/meson.build                    |   1 +
>  hw/display/virtio-dmabuf.c                | 136 +++++++++++++++++
>  hw/virtio/vhost-user.c                    | 174 ++++++++++++++++++++--
>  include/hw/virtio/vhost-backend.h         |   3 +
>  include/hw/virtio/virtio-dmabuf.h         | 103 +++++++++++++
>  include/qemu/uuid.h                       |   2 +
>  subprojects/libvhost-user/libvhost-user.c | 118 +++++++++++++++
>  subprojects/libvhost-user/libvhost-user.h |  55 ++++++-
>  tests/unit/meson.build                    |   1 +
>  tests/unit/test-uuid.c                    |  27 ++++
>  tests/unit/test-virtio-dmabuf.c           | 137 +++++++++++++++++
>  util/uuid.c                               |  14 ++
>  14 files changed, 821 insertions(+), 14 deletions(-)
>  create mode 100644 hw/display/virtio-dmabuf.c
>  create mode 100644 include/hw/virtio/virtio-dmabuf.h
>  create mode 100644 tests/unit/test-virtio-dmabuf.c
>
> --
> 2.40.0
>
>

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