[PATCH v6 04/11] x86: define IA32_FEATUE_CONTROL.SGX_LC

[Jarkko Sakkinen]

When IA32_FEATURE_CONTROL.SGX_LC identifies that the root key for
enclave signatures can be configured either by the OS or pre-boot
firmware.

If this the case, IA32_SGXLEPUBKEYHASHn MSRs (0 < n < 4) can be used to
set the SHA256 of the root key. IA32_FEATURE_CONTROL bit 17 controls
whether the MSRs are writable by the OS. The pre-boot firmware can
decided whether to  set this bit before setting
IA32_FEATURE_CONTROL.LOCK.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
---
 arch/x86/include/asm/cpufeatures.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 31a7d1c0f204..43130f3c18a1 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -298,6 +298,7 @@
 #define X86_FEATURE_AVX512_VPOPCNTDQ (16*32+14) /* POPCNT for vectors of DW/QW */
 #define X86_FEATURE_LA57	(16*32+16) /* 5-level page tables */
 #define X86_FEATURE_RDPID	(16*32+22) /* RDPID instruction */
+#define X86_FEATURE_SGX_LC	(16*32+30) /* supports SGX launch configuration */
 
 /* AMD-defined CPU features, CPUID level 0x80000007 (ebx), word 17 */
 #define X86_FEATURE_OVERFLOW_RECOV (17*32+0) /* MCA overflow recovery support */
-- 
2.14.1