linux-kernel - [RFC PATCH v1 02/18] x86: Secure Memory Encryption (SME) build enablement

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Date:	Tue, 26 Apr 2016 17:56:14 -0500
From:	Tom Lendacky <thomas.lendacky@....com>
To:	<linux-arch@...r.kernel.org>, <linux-efi@...r.kernel.org>,
	<kvm@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<x86@...nel.org>, <linux-kernel@...r.kernel.org>,
	<kasan-dev@...glegroups.com>, <linux-mm@...ck.org>,
	<iommu@...ts.linux-foundation.org>
CC:	Radim Krčmář <rkrcmar@...hat.com>,
	Arnd Bergmann <arnd@...db.de>,
	Jonathan Corbet <corbet@....net>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Joerg Roedel <joro@...tes.org>,
	"Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	"Ingo Molnar" <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrey Ryabinin <aryabinin@...tuozzo.com>,
	"Alexander Potapenko" <glider@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Dmitry Vyukov" <dvyukov@...gle.com>
Subject: [RFC PATCH v1 02/18] x86: Secure Memory Encryption (SME) build
 enablement

Provide the Kconfig support to build the SME support in the kernel.

Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
---
 arch/x86/Kconfig |    9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 7bb1574..13249b5 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1356,6 +1356,15 @@ config X86_DIRECT_GBPAGES
 	  supports them), so don't confuse the user by printing
 	  that we have them enabled.
 
+config AMD_MEM_ENCRYPT
+	bool "Secure Memory Encryption support for AMD"
+	depends on X86_64 && CPU_SUP_AMD
+	---help---
+	  Say yes to enable the encryption of system memory. This requires
+	  an AMD processor that supports Secure Memory Encryption (SME).
+	  The encryption of system memory is disabled by default but can be
+	  enabled with the mem_encrypt=on command line option.
+
 # Common NUMA Features
 config NUMA
 	bool "Numa Memory Allocation and Scheduler Support"