Re: [RFC PATCH v9 3/4] drm/virtio: implement userptr resource support

[Dmitry Osipenko <dmitry.osipenko@collabora.com>]

24.09.2026 12:55, Honglei Huang пишет:
> +int virtio_gpu_userptr_create(struct virtio_gpu_device *vgdev,
> +			      struct drm_file *file,
> +			      struct virtio_gpu_object_params *params,
> +			      struct virtio_gpu_object **bo_ptr)
> +{
> +	struct virtio_gpu_object_userptr *userptr;
> +	struct virtio_gpu_mem_entry *ents = NULL;
> +	struct sg_table *sgt;
> +	struct mm_struct *mm;
> +	unsigned long lock_limit;
> +	unsigned long start;
> +	unsigned long end;
> +	s64 new_pinned;
> +	unsigned int nents;
> +	int ret;
> +
> +	*bo_ptr = NULL;
> +
> +	if (!params->size || !IS_ALIGNED(params->size, PAGE_SIZE) ||
> +	    params->userptr != (unsigned long)params->userptr)
> +		return -EINVAL;
> +
> +	start = params->userptr;
> +	if (!IS_ALIGNED(start, PAGE_SIZE) ||
> +	    check_add_overflow(start, (unsigned long)params->size, &end))
> +		return -EINVAL;

There is new vgdev->blob_alignment defining host page size as it may
differ from guest's page. Will be good to validate both.

-- 
Best regards,
Dmitry