[Qemu-devel] driver enhancement for Intel IGD passthrough

[Tian, Kevin]

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