Add blob resource support to the vhost-user-gpu device, enabling
Vulkan pass-through via Venus with a vhost-user backend such as
vhost-device-gpu.

Patch 1 fixes a deadlock that occurs when the memory region
transaction commit triggers ADD_MEM_REG back to the backend while
it is still blocked waiting for the SHMEM_MAP reply.

Patches 2-3 register a shared memory region for SHMEM_MAP/UNMAP
operations and forward the RESOURCE_BLOB and CONTEXT_INIT feature
flags from the backend to the guest.

Dorinda Bassey (1):
  vhost: Fix SHMEM_MAP transaction ordering and resulting deadlock

Matej Hrica (2):
  vhost-user-gpu: Add shared memory region support
  vhost-user-gpu: Forward RESOURCE_BLOB and CONTEXT_INIT flags

 hw/display/vhost-user-gpu.c | 17 +++++++++++++++++
 hw/virtio/vhost-user.c      | 20 ++------------------
 hw/virtio/vhost.c           | 10 ++++++++++
 3 files changed, 29 insertions(+), 18 deletions(-)

Changes in v3:
- Reordered patches: bugfix first, then features
- Added Fixes tag

Changes in v2:
- Reordered patches: shmem support before feature flags
- Use virtio_new_shmem_region() helper
- Drop explicit transaction begin/commit wrapping

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2.52.0