x86/bugs: Add attack vector controls for retbleed

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Use attack vector controls to determine if retbleed mitigation is
required.

Disable SMT if cross-thread protection is desired and STIBP is not
available.

Signed-off-by: David Kaplan <david.kaplan@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/20250707183316.1349127-13-david.kaplan@amd.com

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David Kaplan 2025-07-07 13:33:07 -05:00 • committed by Borislav Petkov (AMD)

parent 19a5f3ea43

commit 9687eb2399

1 changed files with 8 additions and 3 deletions

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arch/x86/kernel/cpu/bugs.c

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