Re: [Qemu-devel] driver enhancement for Intel IGD passthrough

[Tian, Kevin]

ping...

> From: Tian, Kevin
> Sent: Friday, April 10, 2015 10:33 AM
> 
> Hi,
> 
> We are working on Linux/Windows graphics driver enhancement to
> remove those non-standard PCI resource accesses, e.g. to PCH/MCH
> registers, in parallel with the ongoing effort from Tiejun on current
> driver support.
> 
> When the goal is to make IGD passthrough like a standard PCI
> passthrough w/o IGD specific patches, there is one open about VBT
> table which contains important display information (resolution,
> timing, etc.) for embedded panels (e.g. on laptop) which may not
> be detected through normal EDID query interface. Lacking of VBT
> may lead to a suboptimal display quality and other tricky issues.
> 
> So we want to hear your opinions whether it makes sense to you
> to only maintain one IGD specific logic by exposing VBT through
> OpRegion to the guest. Except it all current IGD specific tweaks
> will not be required in the future w/ planned driver enhancements.
> 
> Thanks
> Kevin