linux-kernel - [PATCH v15 04/23] x86/msr: Add IA32_FEATURE_CONTROL.SGX

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Date:   Sat,  3 Nov 2018 01:11:03 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     x86@...nel.org, platform-driver-x86@...r.kernel.org,
        linux-sgx@...r.kernel.org
Cc:     dave.hansen@...el.com, sean.j.christopherson@...el.com,
        nhorman@...hat.com, npmccallum@...hat.com, serge.ayoun@...el.com,
        shay.katz-zamir@...el.com, haitao.huang@...el.com,
        mark.shanahan@...el.com, andriy.shevchenko@...ux.intel.com,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Matt Turner <mattst88@...il.com>,
        Janakarajan Natarajan <Janakarajan.Natarajan@....com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        linux-kernel@...r.kernel.org (open list:X86 ARCHITECTURE (32-BIT AND
        64-BIT))
Subject: [PATCH v15 04/23] x86/msr: Add IA32_FEATURE_CONTROL.SGX_ENABLE definition

From: Sean Christopherson <sean.j.christopherson@...el.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@...el.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 4731f0cf97c5..2837f65ac817 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -486,6 +486,7 @@
 #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