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

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Message-ID: <77d96772-9518-4a60-a258-4bf58bf576ff@collabora.com>
Date: Thu, 13 Nov 2025 05:20:21 +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_object.c b/drivers/gpu/drm/virtio/virtgpu_object.c
> index e6363c887500..6118344bff84 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_object.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_object.c
> @@ -246,8 +246,10 @@ int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
>  		if (params->blob_mem == VIRTGPU_BLOB_MEM_GUEST)
>  			bo->guest_blob = true;
>  
> -		virtio_gpu_cmd_resource_create_blob(vgdev, bo, params,
> -						    ents, nents);
> +		ret = virtio_gpu_cmd_resource_create_blob(vgdev, bo, params,
> +							  ents, nents);
> +		if (ret)
> +			goto err_put_objs;

Isn't it impossible for host to import guest blob when HOST_PAGE_SIZE >
GUEST_PAGE_SIZE?

-- 
Best regards,
Dmitry