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    SubjectRe: [PATCH v6] Add udmabuf misc device
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    On 07/04/2018 07:53 AM, Gerd Hoffmann wrote:
    > On Tue, Jul 03, 2018 at 10:37:57AM +0200, Daniel Vetter wrote:
    >> On Tue, Jul 03, 2018 at 09:53:58AM +0200, Gerd Hoffmann wrote:
    >>> A driver to let userspace turn memfd regions into dma-bufs.
    >>>
    >>> Use case: Allows qemu create dmabufs for the vga framebuffer or
    >>> virtio-gpu ressources. Then they can be passed around to display
    >>> those guest things on the host. To spice client for classic full
    >>> framebuffer display, and hopefully some day to wayland server for
    >>> seamless guest window display.
    >>>
    >>> qemu test branch:
    >>> https://git.kraxel.org/cgit/qemu/log/?h=sirius/udmabuf
    >>>
    >>> Cc: David Airlie <airlied@linux.ie>
    >>> Cc: Tomeu Vizoso <tomeu.vizoso@collabora.com>
    >>> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
    >>> Cc: Daniel Vetter <daniel@ffwll.ch>
    >>> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
    >>
    >> I think some ack for a 2nd use-case, like virtio-wl or whatever would be
    >> really cool. To give us some assurance that this is generically useful.
    >
    > Tomeu? Laurent?

    Sorry, but I think I will need some help to understand how this could
    help in the virtio-wl case [adding Zach Reizner to CC].

    Any graphics buffers that are allocated with memfd will be shared with
    the compositor via wl_shm, without need for dmabufs.

    Daniel Stone [added to CC] commented though that this could be useful for
    browsers that composite pages with a nested Wayland compositor, to avoid
    having to blit each layer so that the EGL platform notifies the
    compositor of new contents.

    Cheers,

    Tomeu

    >> Plus an ack from dma-buf folks (nag them on irc, you don't have them on Cc
    >> here).
    >
    > Hmm, does MAINTAINERS need an update then? Maintainer and mailing lists
    > listed in the "DMA BUFFER SHARING FRAMEWORK" entry are on Cc.
    >
    > Who should be Cc'ed?
    >
    >> Then this is imo good to go.
    >>
    >> I assume you'll push it to drm-misc, like all the other dma-buf stuff?
    >
    > Can do that, sure, after collecting the acks ...
    >
    > thanks,
    > Gerd
    >

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