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(parent: 3ebc170) | patch
x86/bugs: Do IBPB fallback check only once
authorJosh Poimboeuf <jpoimboe@kernel.org>
Tue, 14 Jun 2022 22:07:19 +0000 (15:07 -0700)
committerBorislav Petkov <bp@suse.de>
Mon, 27 Jun 2022 08:34:00 +0000 (10:34 +0200)
commit0fe4aeea9c01baabecc8c3afc7889c809d939bc2
tree7b2532b4d57abff89e5fd5203ee8743df6dd3aeatree | snapshot
parent3ebc170068885b6fc7bedda6c667bb2c4d533159commit | diff
x86/bugs: Do IBPB fallback check only once

When booting with retbleed=auto, if the kernel wasn't built with
CONFIG_CC_HAS_RETURN_THUNK, the mitigation falls back to IBPB.  Make
sure a warning is printed in that case.  The IBPB fallback check is done
twice, but it really only needs to be done once.

Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
arch/x86/kernel/cpu/bugs.c diff | blob | history
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