[PATCH] iommu/intel: quirk to disable DMAR for QM57 igfx

[Joerg Roedel]

On Tue, Jan 22, 2019 at 04:48:26PM +0200, Joonas Lahtinen wrote:
> According to our IOMMU folks there exists some desire to be able to assign
> the iGFX device aka have intel_iommu=on instead of intel_iommu=igfx_off
> due to how the devices might be grouped in IOMMU groups. Even when you
> would not be using the iGFX device.

You can force the igfx device into a SI domain, or does that also
trigger the iommu issues on the chipset?

In any case, if iommu=on breaks these systems I want to make them work
again with opt-out, even at the cost of breaking assignability.

Regards,

	Joerg