x86/cpu/amd: Zenbleed kernel workaround (CVE-2023-20593) (!2854) · Merge requests · Red Hat / centos-stream / src / kernel / centos-stream-9

Waiman Long requested to merge llong1/centos-stream-9:bz2226822_zenbleed into main Jul 26, 2023

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2226822
CVE: CVE-2023-20593
MR: !2854 (merged)

This MR backports the current upstream kernel workaround for fixing Zenbleed by enabling a chicken bit in Zen2 CPU in case the right microcode isn't loaded, albeit with some likely performance cost. It also includes a number of microcode updates and fixes along the way to reduce merge conflicts.

Signed-off-by: Waiman Long longman@redhat.com

Edited Jul 27, 2023 by Waiman Long

x86/cpu/amd: Zenbleed kernel workaround (CVE-2023-20593)

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