Discussion about x-igd-opregion

[Laszlo Ersek]

On 05/06/18 13:32, Du, Changbin wrote:
> On Thu, Apr 26, 2018 at 07:10:12PM +0200, Laszlo Ersek wrote:
>> On 04/26/18 18:53, Alex Williamson wrote:
>>> [CC +Laszlo, Gerd, Jack]
>>
>> (thanks!)
>>
>>> From there, it's already been proposed that a GVT-g device could expose
>>> a UEFI compatible option ROM that could potentially enable the opregion
>>> on its own, which seems like a better option to pursue before we ask
>>> EDK2 to incorporate opregion handling.  Thanks,
>>
>> Indeed.
>>
> It seems exposing Option ROM is the best choice unless gfx driver can get rid of
> opregion. As I have posted on OVMF BZ935, we have worked out a patch to
> implement this feature. In that patch, I use the IgdAssignment efi module which
> was build from Laszlo's patch. I know Gerd also has a implementation and that
> eif module should work fine, too.
> 
> Hi Laszlo, if you agree, I will make a formal kernel patch which includes the
> efi moudle. And thanks for all of your help, including Alex, Jack and Gerd!

I agree; any further possible updates to the oprom should be done where
the rest of the emulation is implemented, IMO.

Thanks!
Laszlo