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In most cases, the use of "fast 32-bit system call" depends either on X86_FEATURE_SEP or X86_FEATURE_SYSENTER32 || X86_FEATURE_SYSCALL32. However, nearly all the logic for both is identical. Define X86_FEATURE_SYSFAST32 which indicates that *either* SYSENTER32 or SYSCALL32 should be used, for either 32- or 64-bit kernels. This defaults to SYSENTER; use SYSCALL if the SYSCALL32 bit is also set. As this removes ALL existing uses of X86_FEATURE_SYSENTER32, which is a kernel-only synthetic feature bit, simply remove it and replace it with X86_FEATURE_SYSFAST32. This leaves an unused alternative for a true 32-bit kernel, but that should really not matter in any way. The clearing of X86_FEATURE_SYSCALL32 can be removed once the patches for automatically clearing disabled features has been merged. Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Link: https://patch.msgid.link/20251216212606.1325678-10-hpa@zytor.com
210 lines
5.0 KiB
Plaintext
210 lines
5.0 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0
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#
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# x86 feature bits (see arch/x86/include/asm/cpufeatures.h) that are
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# either REQUIRED to be enabled, or DISABLED (always ignored) for this
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# particular compile-time configuration. The tests for these features
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# are turned into compile-time constants via the generated
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# <asm/cpufeaturemasks.h>.
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#
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# The naming of these variables *must* match asm/cpufeatures.h, e.g.,
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# X86_FEATURE_ALWAYS <==> X86_REQUIRED_FEATURE_ALWAYS
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# X86_FEATURE_FRED <==> X86_DISABLED_FEATURE_FRED
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#
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# And these REQUIRED and DISABLED config options are manipulated in an
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# AWK script as the following example:
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#
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# +----------------------+
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# | X86_FRED = y ? |
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# +----------------------+
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# / \
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# Y / \ N
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# +-------------------------------------+ +-------------------------------+
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# | X86_DISABLED_FEATURE_FRED undefined | | X86_DISABLED_FEATURE_FRED = y |
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# +-------------------------------------+ +-------------------------------+
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# |
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# |
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# +-------------------------------------------+ |
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# | X86_FEATURE_FRED: feature word 12, bit 17 | ---->|
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# +-------------------------------------------+ |
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# |
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# |
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# +-------------------------------+
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# | set bit 17 of DISABLED_MASK12 |
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# +-------------------------------+
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#
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config X86_REQUIRED_FEATURE_ALWAYS
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def_bool y
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config X86_REQUIRED_FEATURE_NOPL
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def_bool y
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depends on X86_64 || X86_P6_NOP
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config X86_REQUIRED_FEATURE_CX8
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def_bool y
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depends on X86_CX8
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# this should be set for all -march=.. options where the compiler
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# generates cmov.
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config X86_REQUIRED_FEATURE_CMOV
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def_bool y
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depends on X86_CMOV
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# this should be set for all -march= options where the compiler
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# generates movbe.
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config X86_REQUIRED_FEATURE_MOVBE
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def_bool y
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depends on MATOM
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config X86_REQUIRED_FEATURE_SYSFAST32
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def_bool y
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depends on X86_64 && !X86_FRED
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config X86_REQUIRED_FEATURE_CPUID
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def_bool y
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depends on X86_64
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config X86_REQUIRED_FEATURE_UP
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def_bool y
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depends on !SMP
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config X86_REQUIRED_FEATURE_FPU
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def_bool y
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depends on !MATH_EMULATION
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config X86_REQUIRED_FEATURE_PAE
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def_bool y
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depends on X86_64 || X86_PAE
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config X86_REQUIRED_FEATURE_PSE
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def_bool y
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depends on X86_64 && !PARAVIRT_XXL
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config X86_REQUIRED_FEATURE_PGE
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def_bool y
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depends on X86_64 && !PARAVIRT_XXL
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config X86_REQUIRED_FEATURE_MSR
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def_bool y
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depends on X86_64
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config X86_REQUIRED_FEATURE_FXSR
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def_bool y
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depends on X86_64
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config X86_REQUIRED_FEATURE_XMM
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def_bool y
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depends on X86_64
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config X86_REQUIRED_FEATURE_XMM2
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def_bool y
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depends on X86_64
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config X86_REQUIRED_FEATURE_LM
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def_bool y
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depends on X86_64
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config X86_DISABLED_FEATURE_UMIP
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def_bool y
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depends on !X86_UMIP
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config X86_DISABLED_FEATURE_VME
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def_bool y
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depends on X86_64
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config X86_DISABLED_FEATURE_K6_MTRR
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def_bool y
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depends on X86_64
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config X86_DISABLED_FEATURE_CYRIX_ARR
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def_bool y
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depends on X86_64
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config X86_DISABLED_FEATURE_CENTAUR_MCR
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def_bool y
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depends on X86_64
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config X86_DISABLED_FEATURE_SYSCALL32
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def_bool y
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depends on !X86_64
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config X86_DISABLED_FEATURE_PCID
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def_bool y
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depends on !X86_64
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config X86_DISABLED_FEATURE_LASS
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def_bool y
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depends on X86_32
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config X86_DISABLED_FEATURE_PKU
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def_bool y
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depends on !X86_INTEL_MEMORY_PROTECTION_KEYS
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config X86_DISABLED_FEATURE_OSPKE
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def_bool y
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depends on !X86_INTEL_MEMORY_PROTECTION_KEYS
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config X86_DISABLED_FEATURE_PTI
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def_bool y
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depends on !MITIGATION_PAGE_TABLE_ISOLATION
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config X86_DISABLED_FEATURE_RETPOLINE
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def_bool y
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depends on !MITIGATION_RETPOLINE
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config X86_DISABLED_FEATURE_RETPOLINE_LFENCE
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def_bool y
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depends on !MITIGATION_RETPOLINE
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config X86_DISABLED_FEATURE_RETHUNK
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def_bool y
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depends on !MITIGATION_RETHUNK
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config X86_DISABLED_FEATURE_UNRET
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def_bool y
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depends on !MITIGATION_UNRET_ENTRY
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config X86_DISABLED_FEATURE_CALL_DEPTH
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def_bool y
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depends on !MITIGATION_CALL_DEPTH_TRACKING
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config X86_DISABLED_FEATURE_LAM
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def_bool y
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depends on !ADDRESS_MASKING
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config X86_DISABLED_FEATURE_ENQCMD
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def_bool y
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depends on !INTEL_IOMMU_SVM
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config X86_DISABLED_FEATURE_SGX
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def_bool y
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depends on !X86_SGX
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config X86_DISABLED_FEATURE_XENPV
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def_bool y
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depends on !XEN_PV
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config X86_DISABLED_FEATURE_TDX_GUEST
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def_bool y
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depends on !INTEL_TDX_GUEST
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config X86_DISABLED_FEATURE_USER_SHSTK
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def_bool y
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depends on !X86_USER_SHADOW_STACK
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config X86_DISABLED_FEATURE_IBT
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def_bool y
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depends on !X86_KERNEL_IBT
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config X86_DISABLED_FEATURE_FRED
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def_bool y
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depends on !X86_FRED
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config X86_DISABLED_FEATURE_SEV_SNP
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def_bool y
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depends on !KVM_AMD_SEV
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config X86_DISABLED_FEATURE_INVLPGB
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def_bool y
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depends on !BROADCAST_TLB_FLUSH
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