linux-kernel - Re: [PATCH v4] drm/virtio: Add option to disable KMS support

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Message-ID: <87bkldhisr.fsf@minerva.mail-host-address-is-not-set>
Date:   Tue, 28 Feb 2023 17:11:00 +0100
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     Rob Clark <robdclark@...il.com>, dri-devel@...ts.freedesktop.org
Cc:     Rob Clark <robdclark@...omium.org>,
        Dmitry Osipenko <dmitry.osipenko@...labora.com>,
        Ryan Neph <ryanneph@...omium.org>,
        open list <linux-kernel@...r.kernel.org>,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        Gerd Hoffmann <kraxel@...hat.com>,
        David Airlie <airlied@...hat.com>,
        "open list:VIRTIO GPU DRIVER" 
        <virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH v4] drm/virtio: Add option to disable KMS support

Rob Clark <robdclark@...il.com> writes:

Hello Rob,

> From: Rob Clark <robdclark@...omium.org>
>
> Add a build option to disable modesetting support.  This is useful in
> cases where the guest only needs to use the GPU in a headless mode, or
> (such as in the CrOS usage) window surfaces are proxied to a host
> compositor.
>
> As the modesetting ioctls are a big surface area for potential security
> bugs to be found (it's happened in the past, we should assume it will
> again in the future), it makes sense to have a build option to disable
> those ioctls in cases where they serve no legitimate purpose.
>
> v2: Use more if (IS_ENABLED(...))
> v3: Also permit the host to advertise no scanouts
> v4: Spiff out commit msg
>
> Signed-off-by: Rob Clark <robdclark@...omium.org>
> Reviewed-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
> ---

The patch looks good to me.

Reviewed-by: Javier Martinez Canillas <javierm@...hat.com>

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat