linux-kernel - Re: [virtio-dev] [PATCH v2 4/4] drm/virtio: Support virtgpu exported resources

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Message-ID: <20200304080543.jtf3kcfp6cyegkag@sirius.home.kraxel.org>
Date:   Wed, 4 Mar 2020 09:05:43 +0100
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     David Stevens <stevensd@...omium.org>
Cc:     Gurchetan Singh <gurchetansingh@...omium.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        open list <linux-kernel@...r.kernel.org>,
        ML dri-devel <dri-devel@...ts.freedesktop.org>,
        "open list:VIRTIO GPU DRIVER" 
        <virtualization@...ts.linux-foundation.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        linaro-mm-sig@...ts.linaro.org, virtio-dev@...ts.oasis-open.org
Subject: Re: [virtio-dev] [PATCH v2 4/4] drm/virtio: Support virtgpu exported
 resources

On Tue, Mar 03, 2020 at 11:42:22AM +0900, David Stevens wrote:
> > cmd_p->hdr.ctx_id =
> >
> > Before this completion of this hypercall, this resource can be
> > considered context local, while afterward it can be considered
> > "exported".
> 
> Maybe I'm misunderstanding render contexts, but exporting a resource
> doesn't seem related to render contexts.

It isn't indeed.  Binding resources to contexts might need dma-buf
imports/exports on the host side, but that is another story and not
related to dma-buf exports inside the guest.

cheers,
  Gerd