linux-kernel - Re: [PATCH 2/3] drm/virtio: honor blob

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Message-ID: <7f06489d-0ed8-4d7b-a152-9cb35e04dbb0@collabora.com>
Date: Thu, 13 Nov 2025 05:28:15 +0300
From: Dmitry Osipenko <dmitry.osipenko@...labora.com>
To: Sergio Lopez <slp@...hat.com>, David Airlie <airlied@...hat.com>,
 Gerd Hoffmann <kraxel@...hat.com>,
 Gurchetan Singh <gurchetansingh@...omium.org>, Chia-I Wu
 <olvaffe@...il.com>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 Simona Vetter <simona@...ll.ch>, "Michael S. Tsirkin" <mst@...hat.com>,
 Jason Wang <jasowang@...hat.com>, Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
 Eugenio Pérez <eperezma@...hat.com>,
 dri-devel@...ts.freedesktop.org, virtualization@...ts.linux.dev,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] drm/virtio: honor blob_alignment requirements

On 11/10/25 15:52, Sergio Lopez wrote:
> diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
> index 8181b22b9b46..d558ba2d213a 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_vq.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
> @@ -1393,6 +1393,10 @@ int virtio_gpu_cmd_map(struct virtio_gpu_device *vgdev,
>  	struct virtio_gpu_vbuffer *vbuf;
>  	struct virtio_gpu_resp_map_info *resp_buf;
>  
> +	if (vgdev->has_blob_alignment &&
> +	    !IS_ALIGNED(offset, vgdev->blob_alignment))
> +		return -EINVAL;

The vram offset should have been validated when obj is created. Checking
offset here on cmd_map() should be unnecessary.

-- 
Best regards,
Dmitry