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SubjectRe: [PATCH v17 5/6] vfio: ABI for mdev display dma-buf operation
On Thu, 9 Nov 2017 19:35:14 +0100
Gerd Hoffmann <kraxel@redhat.com> wrote:

> Hi,
>
> > struct vfio_device_gfx_plane_info lacks the head field we've been
> > discussing. Thanks,
>
> Adding multihead support turned out to not be that easy. There are
> corner cases like a single framebuffer spawning both heads. Also it
> would be useful to somehow hint to the guest which heads it should use.
>
> In short: Proper multihead support is more complex than just adding a
> head field for later use. So in a short private discussion with Tina we
> came to the conclusion that it will be better add multihead support to
> the API when the first driver wants use it, so we can actually test the
> interface and make sure we didn't miss anything. Adding a incomplete
> multihead API now doesn't help anybody.

Do you think we can enable multi-head and preserve backwards
compatibility within this API proposed here? Thanks,

Alex

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