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
v5 link -> https://lists.gnu.org/archive/html/qemu-devel/2023-08/msg00255.html
v6 link -> https://lists.gnu.org/archive/html/qemu-devel/2023-09/msg00987.html
v7 link -> https://lists.gnu.org/archive/html/qemu-devel/2023-09/msg01190.html
v7 -> v8:
- Move "qemu/osdep.h" include to the virtio-dmabuf source file.
- Remove duplicated glib include.
- Change the title of commits to better reflect the path to the change
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 03a3a62fbd0aa5227e978eef3c67d3978aec9e5f
[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):
util/uuid: add a hash function
hw/display: introduce virtio-dmabuf
vhost-user: add shared_object msg
libvhost-user: handle shared_object msg
MAINTAINERS | 7 +
docs/interop/vhost-user.rst | 57 ++++++++
hw/display/meson.build | 1 +
hw/display/virtio-dmabuf.c | 138 ++++++++++++++++++
hw/virtio/vhost-user.c | 168 ++++++++++++++++++++--
include/hw/virtio/vhost-backend.h | 3 +
include/hw/virtio/virtio-dmabuf.h | 100 +++++++++++++
include/qemu/uuid.h | 2 +
subprojects/libvhost-user/libvhost-user.c | 120 ++++++++++++++++
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 | 15 ++
14 files changed, 818 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
--
2.41.0