From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pl0-f69.google.com (mail-pl0-f69.google.com [209.85.160.69]) by kanga.kvack.org (Postfix) with ESMTP id AAA886B0273 for ; Tue, 26 Jun 2018 10:22:59 -0400 (EDT) Received: by mail-pl0-f69.google.com with SMTP id x23-v6so4045540pln.11 for ; Tue, 26 Jun 2018 07:22:59 -0700 (PDT) Received: from mga09.intel.com (mga09.intel.com. [134.134.136.24]) by mx.google.com with ESMTPS id b125-v6si1501171pgc.514.2018.06.26.07.22.58 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 26 Jun 2018 07:22:58 -0700 (PDT) From: "Kirill A. Shutemov" Subject: [PATCHv4 18/18] x86: Introduce CONFIG_X86_INTEL_MKTME Date: Tue, 26 Jun 2018 17:22:45 +0300 Message-Id: <20180626142245.82850-19-kirill.shutemov@linux.intel.com> In-Reply-To: <20180626142245.82850-1-kirill.shutemov@linux.intel.com> References: <20180626142245.82850-1-kirill.shutemov@linux.intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: Ingo Molnar , x86@kernel.org, Thomas Gleixner , "H. Peter Anvin" , Tom Lendacky Cc: Dave Hansen , Kai Huang , Jacob Pan , linux-kernel@vger.kernel.org, linux-mm@kvack.org, "Kirill A. Shutemov" Add new config option to enabled/disable Multi-Key Total Memory Encryption support. MKTME uses MEMORY_PHYSICAL_PADDING to reserve enough space in per-KeyID direct mappings for memory hotplug. Signed-off-by: Kirill A. Shutemov --- arch/x86/Kconfig | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index fa5e1ec09247..9a843bd63108 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1523,6 +1523,23 @@ 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 PAGE_EXTENSION + depends on X86_64 && CPU_SUP_INTEL + ---help--- + Say yes to enable support for Multi-Key Total Memory Encryption. + This requires an Intel processor that has support of the feature. + + Multikey Total Memory Encryption (MKTME) is a technology that allows + transparent memory encryption in and 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 having 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" @@ -2199,7 +2216,7 @@ config RANDOMIZE_MEMORY config MEMORY_PHYSICAL_PADDING hex "Physical memory mapping padding" if EXPERT - depends on RANDOMIZE_MEMORY + depends on RANDOMIZE_MEMORY || X86_INTEL_MKTME default "0xa" if MEMORY_HOTPLUG default "0x0" range 0x1 0x40 if MEMORY_HOTPLUG -- 2.18.0