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Make DMAR_UNITS_SUPPORTED configurable

Jerry Snitselaar requested to merge jsnitsel/centos-stream-9:rhel9-dmar-units into main

Merge Request Required Information

Bugzilla: https://bugzilla.redhat.com/2094984

Upstream Status: Posted https://github.com/LuBaolu/intel-iommu.git

             - vtd-next-for-v5.20 branch

Tested: Tested on RH Sapphire Rapids systems to make sure currently working systems still worked. HPE doing verification on their impacted systems.

Summary of Changes

Sapphire Rapids has 10 DMAR units per socket, which quickly overwhelms the current limit of 128 in the kernel when there is a system with many sockets, such as HPE's new 64 socket system. Make DMAR_UNITS_SUPPORTED configurable and set it 1024 for MAXSMP.

Jerry Snitselaar (2):
      iommu/vt-d: Make DMAR_UNITS_SUPPORTED a config setting
      rhel config: Set DMAR_UNITS_SUPPORTED

Signed-off-by: Jerry Snitselaar jsnitsel@redhat.com

Approved Bugzilla Ticket

All submissions to CentOS Stream must reference an approved ticket in Red Hat Bugzilla. Please follow the CentOS Stream contribution documentation for how to file this ticket and have it approved.

Edited by Jerry Snitselaar

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