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x86/cpufeatures: Generate the <asm/cpufeaturemasks.h> header based on build config

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Introduce an AWK script to auto-generate the <asm/cpufeaturemasks.h> header
with required and disabled feature masks based on <asm/cpufeatures.h>
and the current build config.

Thus for any CPU feature with a build config, e.g., X86_FRED, simply add:

  config X86_DISABLED_FEATURE_FRED
	def_bool y
	depends on !X86_FRED

to arch/x86/Kconfig.cpufeatures, instead of adding a conditional CPU
feature disable flag, e.g., DISABLE_FRED.

Lastly, the generated required and disabled feature masks will be added to
their corresponding feature masks for this particular compile-time
configuration.

  [ Xin: build integration improvements ]
  [ mingo: Improved changelog and comments ]

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>
Reviewed-by: Nikolay Borisov <nik.borisov@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20250305184725.3341760-3-xin@zytor.com
This commit is contained in:
H. Peter Anvin (Intel)
2025-03-05 10:47:22 -08:00
committed by Ingo Molnar
parent 3d37d9396e
commit 841326332b
9 changed files with 105 additions and 12 deletions
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15
arch/x86/Makefile
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@@ -268,6 +268,21 @@ archscripts: scripts_basic
archheaders:
$(Q)$(MAKE) $(build)=arch/x86/entry/syscalls all
###
# <asm/cpufeaturemasks.h> header generation
cpufeaturemasks.hdr := arch/x86/include/generated/asm/cpufeaturemasks.h
cpufeaturemasks.awk := $(srctree)/arch/x86/tools/cpufeaturemasks.awk
cpufeatures_hdr := $(srctree)/arch/x86/include/asm/cpufeatures.h
targets += $(cpufeaturemasks.hdr)
quiet_cmd_gen_featuremasks = GEN $@
cmd_gen_featuremasks = $(AWK) -f $(cpufeaturemasks.awk) $(cpufeatures_hdr) $(KCONFIG_CONFIG) > $@
$(cpufeaturemasks.hdr): $(cpufeaturemasks.awk) $(cpufeatures_hdr) $(KCONFIG_CONFIG) FORCE
$(shell mkdir -p $(dir $@))
$(call if_changed,gen_featuremasks)
archprepare: $(cpufeaturemasks.hdr)
###
# Kernel objects