x86/cpufeatures: Add {REQUIRED,DISABLED} feature configs

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Required and disabled feature masks completely rely on build configs,
i.e., once a build config is fixed, so are the feature masks.

To prepare for auto-generating the <asm/cpufeaturemasks.h> header
with required and disabled feature masks based on a build config,
add feature Kconfig items:

  - X86_REQUIRED_FEATURE_x
  - X86_DISABLED_FEATURE_x

each of which may be set to "y" if and only if its preconditions from
current build config are met.

Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Signed-off-by: Xin Li (Intel) <xin@zytor.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20250228082338.73859-3-xin@zytor.com

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This commit is contained in:

H. Peter Anvin (Intel) 2025-02-28 00:23:35 -08:00 • committed by Ingo Molnar

parent f666c92090

commit 3d37d9396e

2 changed files with 203 additions and 0 deletions

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arch/x86/Kconfig

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arch/x86/Kconfig.cpufeatures

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