vfio: add vgpu edid support?

[Zhenyu Wang]

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. Even with my own hack to show vgpu
display directly through DRM/KMS, it's still host's policy to do any
monitor off if required.

And turning vgpu display off it's different situation virtual display
driver needs to handle e.g emulate dis-connected state, etc.

-- 
Open Source Technology Center, Intel ltd.

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