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[PATCH 0/4] Virtio shared dma-buf
From: |
Albert Esteve |
Subject: |
[PATCH 0/4] Virtio shared dma-buf |
Date: |
Wed, 3 May 2023 10:19:07 +0200 |
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:
Shared resources table, to hold all resources that can be shared in the host
and their assigned UUID
Internal shared table API for virtio devices to add, lookup and remove resources
Unit test to verify the API.
New message to the vhost-user protocol to allow backend to interact with the
shared
table API through the control socket
Applies cleanly to 4ebc33f
[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):
virtio-dmabuf: introduce virtio-dmabuf
vhost-user: add shared_object msg
vhost-user: refactor send_resp code
libvhost-user: add write_msg cb to dev struct
docs/interop/vhost-user.rst | 15 +++
hw/display/meson.build | 1 +
hw/display/virtio-dmabuf.c | 88 +++++++++++++++++
hw/virtio/vhost-user.c | 90 ++++++++++++++---
include/hw/virtio/virtio-dmabuf.h | 58 +++++++++++
subprojects/libvhost-user/libvhost-user.c | 40 ++++++++
subprojects/libvhost-user/libvhost-user.h | 46 +++++++++
tests/unit/meson.build | 1 +
tests/unit/test-virtio-dmabuf.c | 112 ++++++++++++++++++++++
9 files changed, 438 insertions(+), 13 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
- [PATCH 0/4] Virtio shared dma-buf,
Albert Esteve <=
[PATCH 3/4] vhost-user: refactor send_resp code, Albert Esteve, 2023/05/03
[PATCH 4/4] libvhost-user: add write_msg cb to dev struct, Albert Esteve, 2023/05/03