linux-kernel - Re: [PATCH v3 1/2] drm/virtio: Add window server support

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Message-ID: <20180206170013.7e2b08bb@eldfell>
Date:   Tue, 6 Feb 2018 17:00:13 +0200
From:   Pekka Paalanen <ppaalanen@...il.com>
To:     Gerd Hoffmann <kraxel@...hat.com>
Cc:     Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Stefan Hajnoczi <stefanha@...il.com>,
        Jason Wang <jasowang@...hat.com>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        virtualization@...ts.linux-foundation.org, kernel@...labora.com
Subject: Re: [PATCH v3 1/2] drm/virtio: Add window server support

On Mon, 5 Feb 2018 17:03:22 +0100
Gerd Hoffmann <kraxel@...hat.com> wrote:

> On Mon, Feb 05, 2018 at 03:46:17PM +0100, Tomeu Vizoso wrote:
> > On 02/05/2018 01:20 PM, Gerd Hoffmann wrote:  
> > >    Hi,
> > >   
> 
> Hmm.  I allways assumed the wayland client allocates the buffers, not
> the server.  Is that wrong?

Hi Gerd,

a fly-by comment here:

The standard operation mode on Wayland indeed is that the client
allocates any pixel buffers. It is not the whole story though.

Server allocated buffers passed to a client also exist:
- core protocol uses this to pass keymaps to clients
- people are not forbidden from writing Wayland extensions that do this
  for whatever reason

The latter server-allocated case could probably be overlooked, but the
keymap case not really. Furthermore, copy&paste and drag&drop protocol
pass pipe file descriptors via Wayland to establish client-to-client
pipes.


Thanks,
pq

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