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

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Message-ID: <20230227063821.dg2gbjjwcekbxyzw@sirius.home.kraxel.org>
Date:   Mon, 27 Feb 2023 07:38:21 +0100
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     Rob Clark <robdclark@...il.com>
Cc:     dri-devel@...ts.freedesktop.org, Chia-I Wu <olvaffe@...il.com>,
        Ryan Neph <ryanneph@...omium.org>,
        Dmitry Osipenko <dmitry.osipenko@...labora.com>,
        Rob Clark <robdclark@...omium.org>,
        David Airlie <airlied@...hat.com>,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        Daniel Vetter <daniel@...ll.ch>,
        "open list:VIRTIO GPU DRIVER" 
        <virtualization@...ts.linux-foundation.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/virtio: Add option to disable KMS support

On Fri, Feb 24, 2023 at 10:02:24AM -0800, Rob Clark wrote:
> 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.

Why make that a compile time option?  There is a config option for the
number of scanouts (aka virtual displays) a device has.  Just set that
to zero (and fix the driver to not consider that configuration an
error).

take care,
  Gerd