On Thursday, 2020-07-16 at 16:52:40 +03, Jarkko Sakkinen wrote: > From: Sean Christopherson <sean.j.christopherson@xxxxxxxxx> > > Add X86_FEATURE_SGX from CPUID.(EAX=7, ECX=1), which informs whether the > CPU has SGX. > > Add X86_FEATURE_SGX1 and X86_FEATURE_SGX2 from CPUID.(EAX=12H, ECX=0), > which describe the level of SGX support available [1]. > > Add IA32_FEATURE_CONTROL.SGX_ENABLE. BIOS can use this bit to opt-in SGX > before locking the feature control MSR [2]. > > [1] Intel SDM: 36.7.2 Intel® SGX Resource Enumeration Leaves > [2] Intel SDM: 36.7.1 Intel® SGX Opt-In Configuration > > Reviewed-by: Borislav Petkov <bp@xxxxxxxxx> > Acked-by: Jethro Beekman <jethro@xxxxxxxxxxxx> > Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx> > Co-developed-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx> Reviewed-by: Darren Kenny <darren.kenny@xxxxxxxxxx> > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx> > --- > arch/x86/include/asm/cpufeature.h | 5 +++-- > arch/x86/include/asm/cpufeatures.h | 7 ++++++- > arch/x86/include/asm/disabled-features.h | 18 +++++++++++++++--- > arch/x86/include/asm/msr-index.h | 1 + > arch/x86/include/asm/required-features.h | 2 +- > arch/x86/kernel/cpu/common.c | 4 ++++ > 6 files changed, 30 insertions(+), 7 deletions(-) > > diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h > index 59bf91c57aa8..efbdba5170a3 100644 > --- a/arch/x86/include/asm/cpufeature.h > +++ b/arch/x86/include/asm/cpufeature.h > @@ -30,6 +30,7 @@ enum cpuid_leafs > CPUID_7_ECX, > CPUID_8000_0007_EBX, > CPUID_7_EDX, > + CPUID_12_EAX, > }; > > #ifdef CONFIG_X86_FEATURE_NAMES > @@ -89,7 +90,7 @@ extern const char * const x86_bug_flags[NBUGINTS*32]; > CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 17, feature_bit) || \ > CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 18, feature_bit) || \ > REQUIRED_MASK_CHECK || \ > - BUILD_BUG_ON_ZERO(NCAPINTS != 19)) > + BUILD_BUG_ON_ZERO(NCAPINTS != 20)) > > #define DISABLED_MASK_BIT_SET(feature_bit) \ > ( CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 0, feature_bit) || \ > @@ -112,7 +113,7 @@ extern const char * const x86_bug_flags[NBUGINTS*32]; > CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 17, feature_bit) || \ > CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 18, feature_bit) || \ > DISABLED_MASK_CHECK || \ > - BUILD_BUG_ON_ZERO(NCAPINTS != 19)) > + BUILD_BUG_ON_ZERO(NCAPINTS != 20)) > > #define cpu_has(c, bit) \ > (__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 : \ > diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h > index 02dabc9e77b0..545ac3e0e269 100644 > --- a/arch/x86/include/asm/cpufeatures.h > +++ b/arch/x86/include/asm/cpufeatures.h > @@ -13,7 +13,7 @@ > /* > * Defines x86 CPU feature bits > */ > -#define NCAPINTS 19 /* N 32-bit words worth of info */ > +#define NCAPINTS 20 /* N 32-bit words worth of info */ > #define NBUGINTS 1 /* N 32-bit bug flags */ > > /* > @@ -238,6 +238,7 @@ > /* Intel-defined CPU features, CPUID level 0x00000007:0 (EBX), word 9 */ > #define X86_FEATURE_FSGSBASE ( 9*32+ 0) /* RDFSBASE, WRFSBASE, RDGSBASE, WRGSBASE instructions*/ > #define X86_FEATURE_TSC_ADJUST ( 9*32+ 1) /* TSC adjustment MSR 0x3B */ > +#define X86_FEATURE_SGX ( 9*32+ 2) /* Software Guard Extensions */ > #define X86_FEATURE_BMI1 ( 9*32+ 3) /* 1st group bit manipulation extensions */ > #define X86_FEATURE_HLE ( 9*32+ 4) /* Hardware Lock Elision */ > #define X86_FEATURE_AVX2 ( 9*32+ 5) /* AVX2 instructions */ > @@ -373,6 +374,10 @@ > #define X86_FEATURE_CORE_CAPABILITIES (18*32+30) /* "" IA32_CORE_CAPABILITIES MSR */ > #define X86_FEATURE_SPEC_CTRL_SSBD (18*32+31) /* "" Speculative Store Bypass Disable */ > > +/* Intel-defined SGX features, CPUID level 0x00000012:0 (EAX), word 19 */ > +#define X86_FEATURE_SGX1 (19*32+ 0) /* SGX1 leaf functions */ > +#define X86_FEATURE_SGX2 (19*32+ 1) /* SGX2 leaf functions */ > + > /* > * BUG word(s) > */ > diff --git a/arch/x86/include/asm/disabled-features.h b/arch/x86/include/asm/disabled-features.h > index 4ea8584682f9..dbe534d5153f 100644 > --- a/arch/x86/include/asm/disabled-features.h > +++ b/arch/x86/include/asm/disabled-features.h > @@ -28,13 +28,18 @@ > # define DISABLE_CYRIX_ARR (1<<(X86_FEATURE_CYRIX_ARR & 31)) > # define DISABLE_CENTAUR_MCR (1<<(X86_FEATURE_CENTAUR_MCR & 31)) > # define DISABLE_PCID 0 > +# define DISABLE_SGX1 0 > +# define DISABLE_SGX2 0 > #else > # define DISABLE_VME 0 > # define DISABLE_K6_MTRR 0 > # define DISABLE_CYRIX_ARR 0 > # define DISABLE_CENTAUR_MCR 0 > # define DISABLE_PCID (1<<(X86_FEATURE_PCID & 31)) > -#endif /* CONFIG_X86_64 */ > +# define DISABLE_SGX1 (1<<(X86_FEATURE_SGX1 & 31)) > +# define DISABLE_SGX2 (1<<(X86_FEATURE_SGX2 & 31)) > + #endif /* CONFIG_X86_64 */ > + > > #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS > # define DISABLE_PKU 0 > @@ -56,6 +61,12 @@ > # define DISABLE_PTI (1 << (X86_FEATURE_PTI & 31)) > #endif > > +#ifdef CONFIG_INTEL_SGX > +# define DISABLE_SGX 0 > +#else > +# define DISABLE_SGX (1 << (X86_FEATURE_SGX & 31)) > +#endif > + > /* > * Make sure to add features to the correct mask > */ > @@ -68,7 +79,7 @@ > #define DISABLED_MASK6 0 > #define DISABLED_MASK7 (DISABLE_PTI) > #define DISABLED_MASK8 0 > -#define DISABLED_MASK9 (DISABLE_SMAP) > +#define DISABLED_MASK9 (DISABLE_SMAP|DISABLE_SGX) > #define DISABLED_MASK10 0 > #define DISABLED_MASK11 0 > #define DISABLED_MASK12 0 > @@ -78,6 +89,7 @@ > #define DISABLED_MASK16 (DISABLE_PKU|DISABLE_OSPKE|DISABLE_LA57|DISABLE_UMIP) > #define DISABLED_MASK17 0 > #define DISABLED_MASK18 0 > -#define DISABLED_MASK_CHECK BUILD_BUG_ON_ZERO(NCAPINTS != 19) > +#define DISABLED_MASK19 (DISABLE_SGX1|DISABLE_SGX2) > +#define DISABLED_MASK_CHECK BUILD_BUG_ON_ZERO(NCAPINTS != 20) > > #endif /* _ASM_X86_DISABLED_FEATURES_H */ > diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h > index e8370e64a155..18e08da19f16 100644 > --- a/arch/x86/include/asm/msr-index.h > +++ b/arch/x86/include/asm/msr-index.h > @@ -582,6 +582,7 @@ > #define FEAT_CTL_LOCKED BIT(0) > #define FEAT_CTL_VMX_ENABLED_INSIDE_SMX BIT(1) > #define FEAT_CTL_VMX_ENABLED_OUTSIDE_SMX BIT(2) > +#define FEAT_CTL_SGX_ENABLED BIT(18) > #define FEAT_CTL_LMCE_ENABLED BIT(20) > > #define MSR_IA32_TSC_ADJUST 0x0000003b > diff --git a/arch/x86/include/asm/required-features.h b/arch/x86/include/asm/required-features.h > index 6847d85400a8..039e58be2fe6 100644 > --- a/arch/x86/include/asm/required-features.h > +++ b/arch/x86/include/asm/required-features.h > @@ -101,6 +101,6 @@ > #define REQUIRED_MASK16 0 > #define REQUIRED_MASK17 0 > #define REQUIRED_MASK18 0 > -#define REQUIRED_MASK_CHECK BUILD_BUG_ON_ZERO(NCAPINTS != 19) > +#define REQUIRED_MASK_CHECK BUILD_BUG_ON_ZERO(NCAPINTS != 20) > > #endif /* _ASM_X86_REQUIRED_FEATURES_H */ > diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c > index 95c090a45b4b..7aecf5d07c70 100644 > --- a/arch/x86/kernel/cpu/common.c > +++ b/arch/x86/kernel/cpu/common.c > @@ -914,6 +914,10 @@ void get_cpu_cap(struct cpuinfo_x86 *c) > c->x86_capability[CPUID_D_1_EAX] = eax; > } > > + /* Additional Intel-defined SGX flags: level 0x00000012 */ > + if (c->cpuid_level >= 0x00000012) > + c->x86_capability[CPUID_12_EAX] = cpuid_eax(0x00000012); > + > /* AMD-defined flags: level 0x80000001 */ > eax = cpuid_eax(0x80000000); > c->extended_cpuid_level = eax; > -- > 2.25.1
