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Commit c62fa117 authored by Johannes Wikner's avatar Johannes Wikner Committed by Borislav Petkov (AMD)
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x86/bugs: Do not use UNTRAIN_RET with IBPB on entry



Since X86_FEATURE_ENTRY_IBPB will invalidate all harmful predictions
with IBPB, no software-based untraining of returns is needed anymore.
Currently, this change affects retbleed and SRSO mitigations so if
either of the mitigations is doing IBPB and the other one does the
software sequence, the latter is not needed anymore.

  [ bp: Massage commit message. ]

Suggested-by: default avatarBorislav Petkov <bp@alien8.de>
Signed-off-by: default avatarJohannes Wikner <kwikner@ethz.ch>
Cc: <stable@kernel.org>
parent 0fad2878
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