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[PATCH v4 0/4] Virtio shared dma-buf
From: |
Albert Esteve |
Subject: |
[PATCH v4 0/4] Virtio shared dma-buf |
Date: |
Mon, 26 Jun 2023 09:34:22 +0200 |
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
v3 -> v4:
- Split the different message types for shared objects into different
messages
- Add a vhost-user feature bit to negotiate the shared object feature
- Minor improvements following suggestions
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
- 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 b455ce4c2f300c8ba47cba7232dd03261368a4cb
[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 | 42 ++++++++
hw/display/meson.build | 1 +
hw/display/virtio-dmabuf.c | 90 +++++++++++++++++
hw/virtio/vhost-user.c | 115 +++++++++++++++++++---
include/hw/virtio/virtio-dmabuf.h | 59 +++++++++++
include/qemu/uuid.h | 2 +
subprojects/libvhost-user/libvhost-user.c | 101 +++++++++++++++++++
subprojects/libvhost-user/libvhost-user.h | 53 +++++++++-
tests/unit/meson.build | 1 +
tests/unit/test-uuid.c | 27 +++++
tests/unit/test-virtio-dmabuf.c | 112 +++++++++++++++++++++
util/uuid.c | 14 +++
13 files changed, 610 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
- [PATCH v4 0/4] Virtio shared dma-buf,
Albert Esteve <=