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x86/cpu: Enable STIBP on AMD if Automatic IBRS is enabled

Waiman Long requested to merge llong1/centos-stream-9:bz2227917_stibp into main

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2227917
MR: !2919 (merged)

This MR fixes a bug in the current autoIBRS code in the kernel to fix a potential security vulnerability.

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

Edited by Waiman Long

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