linux-kernel - Re: [PATCH RFC v2 5/5] drm/virtio: add VIRTGPU_PARAM_HOST_SHM_PAGE

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Message-ID: <f6d6de4d-1b87-4a53-a2eb-0d9ddfbc4311@collabora.com>
Date: Fri, 14 Feb 2025 20:13:12 +0300
From: Dmitry Osipenko <dmitry.osipenko@...labora.com>
To: Sergio Lopez <slp@...hat.com>, "Michael S. Tsirkin" <mst@...hat.com>,
 Daniel Verkamp <dverkamp@...omium.org>, Jason Wang <jasowang@...hat.com>,
 Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, Eugenio Pérez
 <eperezma@...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>, Rob Clark <robdclark@...il.com>,
 fnkl.kernel@...il.com
Cc: virtualization@...ts.linux.dev, linux-kernel@...r.kernel.org,
 dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH RFC v2 5/5] drm/virtio: add
 VIRTGPU_PARAM_HOST_SHM_PAGE_SIZE to params

On 2/14/25 18:16, Sergio Lopez wrote:
> diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> index c33c057365f85a2ace536f91655c903036827312..4b49635b4fe1d4256f219823341cef8e5fa8f029 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> @@ -117,6 +117,11 @@ static int virtio_gpu_getparam_ioctl(struct drm_device *dev, void *data,
>  	case VIRTGPU_PARAM_EXPLICIT_DEBUG_NAME:
>  		value = vgdev->has_context_init ? 1 : 0;
>  		break;
> +	case VIRTGPU_PARAM_HOST_SHM_PAGE_SIZE:
> +		if (!vgdev->has_host_visible)
> +			return -EINVAL;

Nit: virtio_gpu_getparam_ioctl() returns EINVAL for unsupported params.
While this is a supported param, but there is no hostmem available.
Hence, should a different error code, maybe ENOENT or ENXIO.

-- 
Best regards,
Dmitry