[PATCH v1] Revert "drm/virtio: Allow importing prime buffers when 3D is enabled"

[PATCH v1] Revert "drm/virtio: Allow importing prime buffers when 3D is enabled"

[Dmitry Osipenko]

Guest userspace may import udmabuf to vrend. Vrend doesn't support guest
blobs, and thus, further 3d operations with the imported blob are failing.
Typical scenario of the problem shown with mouse cursor RGBA image imported
into virtio-gpu, which previously was rejected by virtio-gpu driver.
Revert enabling guest blobs importing into vrend to fix the regression.

Link: https://gitlab.freedesktop.org/virgl/virglrenderer/-/work_items/674
Fixes: df4dc947c46b ("drm/virtio: Allow importing prime buffers when 3D is enabled")
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
---
 drivers/gpu/drm/virtio/virtgpu_prime.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_prime.c b/drivers/gpu/drm/virtio/virtgpu_prime.c
index 149e6bcb5878..ebf471044d06 100644
--- a/drivers/gpu/drm/virtio/virtgpu_prime.c
+++ b/drivers/gpu/drm/virtio/virtgpu_prime.c
@@ -349,7 +349,7 @@ struct drm_gem_object *virtgpu_gem_prime_import(struct drm_device *dev,
 		}
 	}
 
-	if (!vgdev->has_resource_blob)
+	if (!vgdev->has_resource_blob || vgdev->has_virgl_3d)
 		return drm_gem_prime_import(dev, buf);
 
 	bo = kzalloc_obj(*bo);
-- 
2.55.0

Re: [PATCH v1] Revert "drm/virtio: Allow importing prime buffers when 3D is enabled"

[sashiko-bot]

> Guest userspace may import udmabuf to vrend. Vrend doesn't support guest
> blobs, and thus, further 3d operations with the imported blob are failing.
> Typical scenario of the problem shown with mouse cursor RGBA image imported
> into virtio-gpu, which previously was rejected by virtio-gpu driver.
> Revert enabling guest blobs importing into vrend to fix the regression.
> 
> Link: https://gitlab.freedesktop.org/virgl/virglrenderer/-/work_items/674
> Fixes: df4dc947c46b ("drm/virtio: Allow importing prime buffers when 3D is enabled")
> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260911144204.2089401-1-dmitry.osipenko@collabora.com?part=1

Re: [PATCH v1] Revert "drm/virtio: Allow importing prime buffers when 3D is enabled"

[Yiwei Zhang]

On Fri, Sep 11, 2026 at 7:42 AM Dmitry Osipenko
<dmitry.osipenko@collabora.com> wrote:
>
> Guest userspace may import udmabuf to vrend. Vrend doesn't support guest
> blobs, and thus, further 3d operations with the imported blob are failing.
> Typical scenario of the problem shown with mouse cursor RGBA image imported
> into virtio-gpu, which previously was rejected by virtio-gpu driver.
> Revert enabling guest blobs importing into vrend to fix the regression.
>
> Link: https://gitlab.freedesktop.org/virgl/virglrenderer/-/work_items/674
> Fixes: df4dc947c46b ("drm/virtio: Allow importing prime buffers when 3D is enabled")
> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
> ---
>  drivers/gpu/drm/virtio/virtgpu_prime.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/virtio/virtgpu_prime.c b/drivers/gpu/drm/virtio/virtgpu_prime.c
> index 149e6bcb5878..ebf471044d06 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_prime.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_prime.c
> @@ -349,7 +349,7 @@ struct drm_gem_object *virtgpu_gem_prime_import(struct drm_device *dev,
>                 }
>         }
>
> -       if (!vgdev->has_resource_blob)
> +       if (!vgdev->has_resource_blob || vgdev->has_virgl_3d)
>                 return drm_gem_prime_import(dev, buf);
>
>         bo = kzalloc_obj(*bo);
> --
> 2.55.0
>

r-b. Thanks for the prompt revert!