x86/srso: Add IBPB

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Upstream commit: 233d6f68b9

Add the option to mitigate using IBPB on a kernel entry. Pull in the
Retbleed alternative so that the IBPB call from there can be used. Also,
if Retbleed mitigation is done using IBPB, the same mitigation can and
must be used here.

Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Borislav Petkov (AMD) 2023-07-06 15:04:35 +02:00 • committed by Greg Kroah-Hartman

parent bf46b6249f

commit 948e43310c

2 changed files with 24 additions and 1 deletions

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arch/x86/include/asm/nospec-branch.h

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23

arch/x86/kernel/cpu/bugs.c

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