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From:   Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To:     linux-kernel@vger.kernel.org, x86@kernel.org,
        linux-sgx@vger.kernel.org
Cc:     akpm@linux-foundation.org, dave.hansen@intel.com,
        sean.j.christopherson@intel.com, nhorman@redhat.com,
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        Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Subject: [PATCH v19,RESEND 03/27] x86/msr: Add IA32_FEATURE_CONTROL.SGX_ENABLE definition
Date:   Wed, 20 Mar 2019 18:20:55 +0200
Message-Id: <20190320162119.4469-4-jarkko.sakkinen@linux.intel.com>
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From: Sean Christopherson <sean.j.christopherson@intel.com>

Add a new IA32_FEATURE_CONTROL bit, SGX_ENABLE, which must be set in
order to execute SGX instructions, i.e. ENCL{S,U,V}.  The existence of
the bit is enumerated by CPUID as X86_FEATURE_SGX.  Like all other
flags in IA32_FEATURE_CONTROL, the MSR must be locked for SGX_ENABLE
to take effect.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 arch/x86/include/asm/msr-index.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index ca5bc0eacb95..6efaa8026c64 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -525,6 +525,7 @@
 #define FEATURE_CONTROL_LOCKED				(1<<0)
 #define FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX	(1<<1)
 #define FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX	(1<<2)
+#define FEATURE_CONTROL_SGX_ENABLE			(1<<18)
 #define FEATURE_CONTROL_LMCE				(1<<20)
 
 #define MSR_IA32_APICBASE		0x0000001b
-- 
2.19.1