diff mbox series

[v13,03/13] x86/cpufeatures: Add Intel-defined SGX leaf CPUID_12_EAX

Message ID 20180827185507.17087-4-jarkko.sakkinen@linux.intel.com (mailing list archive)
State New, archived
Headers show
Series Intel SGX1 support | expand

Commit Message

Jarkko Sakkinen Aug. 27, 2018, 6:53 p.m. UTC 
From: Sean Christopherson <sean.j.christopherson@intel.com>

CPUID_12_EAX is an Intel-defined feature bits leaf dedicated for SGX.
There are currently four documented feature bits, with more expected in
the not-too-distant future.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 arch/x86/include/asm/cpufeature.h        | 7 +++++--
 arch/x86/include/asm/cpufeatures.h       | 8 +++++++-
 arch/x86/include/asm/disabled-features.h | 3 ++-
 arch/x86/include/asm/required-features.h | 3 ++-
 arch/x86/kernel/cpu/common.c             | 7 +++++++
 arch/x86/kvm/cpuid.h                     | 1 +
 6 files changed, 24 insertions(+), 5 deletions(-)

Comments

Dave Hansen Aug. 27, 2018, 7:39 p.m. UTC | #1 
On 08/27/2018 11:53 AM, Jarkko Sakkinen wrote:
> +	/* Intel SGX features: level 0x00000012 */
> +	if (c->cpuid_level >= 0x00000012) {
> +		cpuid(0x00000012, &eax, &ebx, &ecx, &edx);
> +
> +		c->x86_capability[CPUID_12_EAX] = eax;
> +	}

I've given this specific bit of feedback at least once in the past.
These patches are not ordered properly.  You introduce this in the next
patch:

+#define SGX_CPUID 0x12
Jarkko Sakkinen Aug. 28, 2018, 7:23 a.m. UTC | #2 
On Mon, Aug 27, 2018 at 12:39:36PM -0700, Dave Hansen wrote:
> On 08/27/2018 11:53 AM, Jarkko Sakkinen wrote:
> > +	/* Intel SGX features: level 0x00000012 */
> > +	if (c->cpuid_level >= 0x00000012) {
> > +		cpuid(0x00000012, &eax, &ebx, &ecx, &edx);
> > +
> > +		c->x86_capability[CPUID_12_EAX] = eax;
> > +	}
> 
> I've given this specific bit of feedback at least once in the past.
> These patches are not ordered properly.  You introduce this in the next
> patch:
> 
> +#define SGX_CPUID 0x12

Yeah, my mistake probably when squashing fixups.

/Jarkko
Borislav Petkov Aug. 28, 2018, 10:21 a.m. UTC | #3 
On Mon, Aug 27, 2018 at 09:53:24PM +0300, Jarkko Sakkinen wrote:
> diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
> index 7bb647f57d42..4af60a0fdb20 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 */
>  
>  /*
> @@ -349,6 +349,12 @@
>  #define X86_FEATURE_ARCH_CAPABILITIES	(18*32+29) /* IA32_ARCH_CAPABILITIES MSR (Intel) */
>  #define X86_FEATURE_SPEC_CTRL_SSBD	(18*32+31) /* "" Speculative Store Bypass Disable */
>  
> +/* Intel SGX CPU features, CPUID level 0x000000012:0 (EAX), word 19 */
> +#define X86_FEATURE_SGX1		(19*32+ 0) /* SGX1 leaf functions */
> +#define X86_FEATURE_SGX2		(19*32+ 1) /* SGX2 leaf functions */
> +#define X86_FEATURE_SGX_ENCLV		(19*32+ 5) /* SGX ENCLV instruction, leafs E[INC|DEC]VIRTCHILD, ESETCONTEXT */
> +#define X86_FEATURE_SGX_ENCLS_C		(19*32+ 6) /* SGX ENCLS leafs ERDINFO, ETRACK, ELDBC and ELDUC */

No need to add a whole new ->x86_capability member for 4 bits - just add
those bits to leaf 8 where the artificial virtualization flags are -
there's some room there.

Thx.
Jarkko Sakkinen Aug. 28, 2018, 10:38 a.m. UTC | #4 
On Tue, Aug 28, 2018 at 12:21:40PM +0200, Borislav Petkov wrote:
> On Mon, Aug 27, 2018 at 09:53:24PM +0300, Jarkko Sakkinen wrote:
> > diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
> > index 7bb647f57d42..4af60a0fdb20 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 */
> >  
> >  /*
> > @@ -349,6 +349,12 @@
> >  #define X86_FEATURE_ARCH_CAPABILITIES	(18*32+29) /* IA32_ARCH_CAPABILITIES MSR (Intel) */
> >  #define X86_FEATURE_SPEC_CTRL_SSBD	(18*32+31) /* "" Speculative Store Bypass Disable */
> >  
> > +/* Intel SGX CPU features, CPUID level 0x000000012:0 (EAX), word 19 */
> > +#define X86_FEATURE_SGX1		(19*32+ 0) /* SGX1 leaf functions */
> > +#define X86_FEATURE_SGX2		(19*32+ 1) /* SGX2 leaf functions */
> > +#define X86_FEATURE_SGX_ENCLV		(19*32+ 5) /* SGX ENCLV instruction, leafs E[INC|DEC]VIRTCHILD, ESETCONTEXT */
> > +#define X86_FEATURE_SGX_ENCLS_C		(19*32+ 6) /* SGX ENCLS leafs ERDINFO, ETRACK, ELDBC and ELDUC */
> 
> No need to add a whole new ->x86_capability member for 4 bits - just add
> those bits to leaf 8 where the artificial virtualization flags are -
> there's some room there.
> 
> Thx.

Roger.

> 
> -- 
> Regards/Gruss,
>     Boris.
> 
> SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
> -- 

/Jarkko
diff mbox series

Patch

diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index aced6c9290d6..940f0c01d5f8 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
@@ -81,8 +82,9 @@  extern const char * const x86_bug_flags[NBUGINTS*32];
 	   CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 16, feature_bit) ||	\
 	   CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 17, feature_bit) ||	\
 	   CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 18, feature_bit) ||	\
+	   CHECK_BIT_IN_MASK_WORD(REQUIRED_MASK, 19, 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) ||	\
@@ -104,8 +106,9 @@  extern const char * const x86_bug_flags[NBUGINTS*32];
 	   CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 16, feature_bit) ||	\
 	   CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 17, feature_bit) ||	\
 	   CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 18, feature_bit) ||	\
+	   CHECK_BIT_IN_MASK_WORD(DISABLED_MASK, 19, 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 7bb647f57d42..4af60a0fdb20 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 */
 
 /*
@@ -349,6 +349,12 @@ 
 #define X86_FEATURE_ARCH_CAPABILITIES	(18*32+29) /* IA32_ARCH_CAPABILITIES MSR (Intel) */
 #define X86_FEATURE_SPEC_CTRL_SSBD	(18*32+31) /* "" Speculative Store Bypass Disable */
 
+/* Intel SGX CPU features, CPUID level 0x000000012:0 (EAX), word 19 */
+#define X86_FEATURE_SGX1		(19*32+ 0) /* SGX1 leaf functions */
+#define X86_FEATURE_SGX2		(19*32+ 1) /* SGX2 leaf functions */
+#define X86_FEATURE_SGX_ENCLV		(19*32+ 5) /* SGX ENCLV instruction, leafs E[INC|DEC]VIRTCHILD, ESETCONTEXT */
+#define X86_FEATURE_SGX_ENCLS_C		(19*32+ 6) /* SGX ENCLS leafs ERDINFO, ETRACK, ELDBC and ELDUC */
+
 /*
  * BUG word(s)
  */
diff --git a/arch/x86/include/asm/disabled-features.h b/arch/x86/include/asm/disabled-features.h
index 33833d1909af..c81b5d446a3e 100644
--- a/arch/x86/include/asm/disabled-features.h
+++ b/arch/x86/include/asm/disabled-features.h
@@ -78,6 +78,7 @@ 
 #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	0
+#define DISABLED_MASK_CHECK BUILD_BUG_ON_ZERO(NCAPINTS != 20)
 
 #endif /* _ASM_X86_DISABLED_FEATURES_H */
diff --git a/arch/x86/include/asm/required-features.h b/arch/x86/include/asm/required-features.h
index 6847d85400a8..fa5700097f64 100644
--- a/arch/x86/include/asm/required-features.h
+++ b/arch/x86/include/asm/required-features.h
@@ -101,6 +101,7 @@ 
 #define REQUIRED_MASK16	0
 #define REQUIRED_MASK17	0
 #define REQUIRED_MASK18	0
-#define REQUIRED_MASK_CHECK BUILD_BUG_ON_ZERO(NCAPINTS != 19)
+#define REQUIRED_MASK19	0
+#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 84dee5ab745a..211c76322ddf 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -866,6 +866,13 @@  void get_cpu_cap(struct cpuinfo_x86 *c)
 		}
 	}
 
+	/* Intel SGX features: level 0x00000012 */
+	if (c->cpuid_level >= 0x00000012) {
+		cpuid(0x00000012, &eax, &ebx, &ecx, &edx);
+
+		c->x86_capability[CPUID_12_EAX] = eax;
+	}
+
 	/* AMD-defined flags: level 0x80000001 */
 	eax = cpuid_eax(0x80000000);
 	c->extended_cpuid_level = eax;
diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h
index 9a327d5b6d1f..669c1774afdb 100644
--- a/arch/x86/kvm/cpuid.h
+++ b/arch/x86/kvm/cpuid.h
@@ -55,6 +55,7 @@  static const struct cpuid_reg reverse_cpuid[] = {
 	[CPUID_7_ECX]         = {         7, 0, CPUID_ECX},
 	[CPUID_8000_0007_EBX] = {0x80000007, 0, CPUID_EBX},
 	[CPUID_7_EDX]         = {         7, 0, CPUID_EDX},
+	[CPUID_12_EAX]        = {        12, 0, CPUID_EAX},
 };
 
 static __always_inline struct cpuid_reg x86_feature_cpuid(unsigned x86_feature)