> From: Kay, Allen M > Sent: Tuesday, February 02, 2016 8:04 AM > > > > David notes in the latter commit above: > > > > "We should be able to successfully assign graphics devices to guests too, as > > long as the initial handling of stolen memory is reconfigured > > appropriately." > > > > What code is supposed to be doing that reconfiguration when a device is > > assigned? Clearly we don't have it yet, making assignment of these devices > > very unsafe. It seems like vfio or IOMMU code in the kernel needs device > > specific code to clear these settings to make it safe for userspace, then > > perhaps VM BIOS support to reallocate. Is there any consistency across IGD > > revisions for doing this? Is there a spec? > > Thanks,
I don't think stolen memory should be handled explicitly. If yes, it should be listed as a RMRR region so general RMRR setup will cover it. But as Allen pointed out, the whole RMRR becomes unnecessary if we target only secondary device for IGD. Thanks Kevin