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Re: [PATCH v5 0/4] Virtio shared dma-buf
From: |
Michael S. Tsirkin |
Subject: |
Re: [PATCH v5 0/4] Virtio shared dma-buf |
Date: |
Tue, 5 Sep 2023 16:45:26 -0400 |
I was hoping for some acks from Gerd or anyone else with a clue
about graphics, but as that doesn't seem to happen I'll merge.
Thanks!
On Mon, Aug 21, 2023 at 02:37:56PM +0200, Albert Esteve wrote:
> 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
>
>
- Re: [PATCH v5 0/4] Virtio shared dma-buf,
Michael S. Tsirkin <=