linux-kernel - [RFC, PATCH 22/22] x86: Introduce CONFIG_X86_INTEL

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Message-Id: <20180305162610.37510-23-kirill.shutemov@linux.intel.com>
Date:   Mon,  5 Mar 2018 19:26:10 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Tom Lendacky <thomas.lendacky@....com>
Cc:     Dave Hansen <dave.hansen@...el.com>,
        Kai Huang <kai.huang@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [RFC, PATCH 22/22] x86: Introduce CONFIG_X86_INTEL_MKTME

Add new config option to enabled/disable Multi-Key Total Memory
Encryption support.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 arch/x86/Kconfig | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 99aecb2caed3..e1b377443899 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1540,6 +1540,23 @@ config ARCH_USE_MEMREMAP_PROT
 	def_bool y
 	depends on AMD_MEM_ENCRYPT
 
+config X86_INTEL_MKTME
+	bool "Intel Multi-Key Total Memory Encryption"
+	select DYNAMIC_PHYSICAL_MASK
+	select ARCH_WANTS_GFP_ENCRYPT
+	depends on X86_64 && CPU_SUP_INTEL
+	---help---
+	  Say yes to enable support for Multi-Key Total Memory Encryption.
+	  This requires Intel processor that has support of the feature.
+
+	  Multikey Total Memory Encryption (MKTME) is a technology that allows
+	  transparent memory encryption in upcoming Intel platforms.
+
+	  MKTME is built on top of TME. TME allows encryption of the entirety
+	  of system memory using a single key. MKTME allows to have multiple
+	  encryption domains, each having own key -- different memory pages can
+	  be encrypted with different keys.
+
 # Common NUMA Features
 config NUMA
 	bool "Numa Memory Allocation and Scheduler Support"
-- 
2.16.1