x86/bugs: Add a separate config for GDS

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Currently, the CONFIG_SPECULATION_MITIGATIONS is halfway populated, where some
mitigations have entries in Kconfig, and they could be modified, while others
mitigations do not have Kconfig entries, and could not be controlled at build
time.

Create a new kernel config that allows GDS to be completely disabled,
similarly to the "gather_data_sampling=off" or "mitigations=off" kernel
command-line.

Now, there are two options for GDS mitigation:

* CONFIG_MITIGATION_GDS=n -> Mitigation disabled (New)
* CONFIG_MITIGATION_GDS=y -> Mitigation enabled (GDS_MITIGATION_FULL)

Suggested-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
Link: https://lore.kernel.org/r/20240729164105.554296-12-leitao@debian.org

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This commit is contained in:

Breno Leitao 2024-07-29 09:40:59 -07:00 • committed by Borislav Petkov (AMD)

parent 03267a534b

commit 225f2bd064

2 changed files with 12 additions and 1 deletions

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10

arch/x86/Kconfig

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3

arch/x86/kernel/cpu/bugs.c

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