vfio: add vgpu edid support?

[Gerd Hoffmann]

On Wed, Sep 12, 2018 at 11:53:16AM +0800, Zhenyu Wang wrote:
> On 2018.09.11 13:20:08 +0200, Gerd Hoffmann wrote:
> > > Besides, I think the proposed "VFIO_DEVICE_GFX_EDID_SET" can also provide
> > > host a capability to trigger display monitor hot-plug event to guest, when host
> > > wants to temporarily turn off vfio/display.
> > 
> > That makes sense indeed.
> > 
> 
> For virtual display, I don't think doing DPMS off alike operation has
> practical usage, as host can control how/whether to show vgpu display.
> vgpu guest can apply display off on virtual display, which host can
> handle through vfio gfx plane ioctl.

It is not DPMS.
It also is not display control.

It is about emulating link status, to give the guest hints how to
configure the display.  Setting display_status to "disconnected" would
be the same as the user powering off the monitor in the physical world.

cheers,
  Gerd