vhost-device-gpu: Add blob resource support and Venus capset for virglrenderer backend - #988
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Update virglrenderer-rs to pull in new API wrappers needed for Venus support: context_create_fence, context_poll, and export_resource_dmabuf. Signed-off-by: Dorinda Bassey <dbassey@redhat.com>
Instead of hardcoding the capset indices, lookup the capset index dynamically based on the configured capsets in the config. Convert the capset bitmask to a capset ID using trailing_zeros() since bits() returns a power-of-2 bitmask, not the capset index. Signed-off-by: Matej Hrica <mhrica@redhat.com> Signed-off-by: Dorinda Bassey <dbassey@redhat.com>
Dispatch to context_create_fence() when the guest sets VIRTIO_GPU_FLAG_INFO_RING_IDX, and poll per-context fences in event_poll(). This is required for Venus multi-timeline fence signaling. Signed-off-by: Dorinda Bassey <dbassey@redhat.com>
Implement blob resource support and shared memory mapping. This is
required for Venus support and gfxstream-{vulkan, gles} enablement.
Updated to use vhost 0.17 and vhost-user-backend 0.23 for shmem.
Added UUID field initialization for blob resources using Uuid::new_v4().
Signed-off-by: Matej Hrica <mhrica@redhat.com>
Co-authored-by: Dorinda Bassey <dbassey@redhat.com>
Expose Venus capability set support using the virglrenderer backend, enabled by the new blob resource support. Signed-off-by: Matej Hrica <mhrica@redhat.com>
The test was trying to obtain capset info for 3 capsets, but only 2 were configured. The test previously passed because the virgl backend incorrectly returned information for the additional capset. Now with 3 capsets (VIRGL, VIRGL2, VENUS), update the test to properly iterate over all configured capsets. Signed-off-by: Matej Hrica <mhrica@redhat.com> Co-authored-by: Dorinda Bassey <dbassey@redhat.com>
Use String::from_utf8_lossy() instead of CStr::from_bytes_with_nul() since the virtio-gpu driver sends debug_name without null terminator. Signed-off-by: Matej Hrica <mhrica@redhat.com> Signed-off-by: Dorinda Bassey <dbassey@redhat.com>
Configure virglrenderer based on the user's capset selection. Enable virgl renderer if VIRGL or VIRGL2 capsets are requested, and Enable Venus/render-server if VENUS capset is requested. Signed-off-by: Matej Hrica <mhrica@redhat.com> Co-authored-by: Dorinda Bassey <dbassey@redhat.com>
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Add the blob_alignment field to VirtioGpuConfig to match the virtio-gpu spec. Set it to the system page size. This is a new config introduced in the spec and QEMU. Signed-off-by: Dorinda Bassey <dbassey@redhat.com>
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Summary of the PR
Implement blob resource creation, mapping, and unmapping for the
virglrenderer backend, using SHMEM_MAP/UNMAP via vhost-user-backend.
This also adds per-context fence support needed for Venus multi-timeline
signaling, dynamic capset index lookup, and Venus capset exposure.
Tested with vkcube in a QEMU guest. Testing with QEMU requires the
vhost-user-gpu SHMEM support patch:
https://lore.kernel.org/all/20260717134920.265128-4-dbassey@redhat.com/
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