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redhat/configs: Enable INTEL_IOMMU_SCALABLE_MODE_DEFAULT_ON

Jerry Snitselaar requested to merge jsnitsel/centos-stream-9:RHEL-28672 into main

Merge Request Required Information

JIRA: https://issues.redhat.com/browse/RHEL-28672
Upstream Status: RHEL-only
Tested: Boot test with 'intel_iommu=on' on SPR, EMR, GNR, SRF, or MTL system. Verified on GNR system that scalable enabled with just 'intel_iommu=on' instead of 'intel_iommu=on,sm_on'

ARK merge request is here: cki-project/kernel-ark!3041 (merged)

Summary of Changes

This is just enabling the config option to default to scalable mode defaulting to enabled on Intel platforms that support the feature when the iommu is enabled.

Approved Development Ticket

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

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

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