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x86: remove retpoline code

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This code:

1) Doesn't work
2) Hasn't ever been enabled by default
3) We mitigate Spectre V2 via Extended IBRS anyway

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2019-12-18 15:11:59 -08:00 • committed by Anas Nashif
commit 07c278382a
6 changed files with 4 additions and 61 deletions
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10
arch/x86/core/Kconfig.ia32
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@ -43,16 +43,6 @@ endmenu
menu "Processor Capabilities"
config X86_RETPOLINE
bool "Build with retpolines enabled in x86 assembly code"
depends on USERSPACE
help
This is recommended on platforms with speculative executions, to
protect against branch target injection (AKA Spectre-V2). Full
description of how retpolines work can be found here[1].
[1] https://support.google.com/faqs/answer/7625886
config X86_ENABLE_TSS
bool
help