RE: [PATCH v2 2/2] iommu/vt-d: Remove rmrr check in domain attaching device path

[Tian, Kevin]

> From: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
> Sent: Thursday, July 13, 2023 12:33 PM
> 
> The core code now prevents devices with RMRR regions from being assigned
> to user space. There is no need to check for this condition in individual
> drivers. Remove it to avoid duplicate code.
> 
> Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
> Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>

Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>

A side note.

device_rmrr_is_relaxable() marks USB/GPU as relaxable. I wonder whether
this policy is specific to Intel platform or generally applied. If the latter
probably that could be moved to iommu core too.