From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-dm3nam03on0055.outbound.protection.outlook.com ([104.47.41.55] helo=NAM03-DM3-obe.outbound.protection.outlook.com) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1d0aTC-0001Au-RB for kexec@lists.infradead.org; Tue, 18 Apr 2017 21:15:32 +0000 From: Tom Lendacky Subject: [PATCH v5 06/32] x86/mm: Add Secure Memory Encryption (SME) support Date: Tue, 18 Apr 2017 16:15:04 -0500 Message-ID: <20170418211504.9689.12900.stgit@tlendack-t1.amdoffice.net> In-Reply-To: <20170418211400.9689.10175.stgit@tlendack-t1.amdoffice.net> References: <20170418211400.9689.10175.stgit@tlendack-t1.amdoffice.net> MIME-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: linux-arch@vger.kernel.org, linux-efi@vger.kernel.org, kvm@vger.kernel.org, linux-doc@vger.kernel.org, x86@kernel.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-mm@kvack.org, iommu@lists.linux-foundation.org Cc: Thomas Gleixner , Rik van Riel , Brijesh Singh , Toshimitsu Kani , Arnd Bergmann , Jonathan Corbet , Matt Fleming , Joerg Roedel , Radim =?utf-8?b?S3LEjW3DocWZ?= , Konrad Rzeszutek Wilk , Andrey Ryabinin , Ingo Molnar , "Michael S. Tsirkin" , Andy Lutomirski , "H. Peter Anvin" , Borislav Petkov , Paolo Bonzini , Alexander Potapenko , Dave Young , Larry Woodman , Dmitry Vyukov Add support for Secure Memory Encryption (SME). This initial support provides a Kconfig entry to build the SME support into the kernel and defines the memory encryption mask that will be used in subsequent patches to mark pages as encrypted. Signed-off-by: Tom Lendacky --- arch/x86/Kconfig | 22 +++++++++++++++++++ arch/x86/include/asm/mem_encrypt.h | 42 ++++++++++++++++++++++++++++++++++++ arch/x86/mm/Makefile | 1 + arch/x86/mm/mem_encrypt.c | 21 ++++++++++++++++++ include/linux/mem_encrypt.h | 37 ++++++++++++++++++++++++++++++++ 5 files changed, 123 insertions(+) create mode 100644 arch/x86/include/asm/mem_encrypt.h create mode 100644 arch/x86/mm/mem_encrypt.c create mode 100644 include/linux/mem_encrypt.h diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 4e153e9..cf0cbe8 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1407,6 +1407,28 @@ config X86_DIRECT_GBPAGES supports them), so don't confuse the user by printing that we have them enabled. +config AMD_MEM_ENCRYPT + bool "AMD Secure Memory Encryption (SME) support" + depends on X86_64 && CPU_SUP_AMD + ---help--- + Say yes to enable support for the encryption of system memory. + This requires an AMD processor that supports Secure Memory + Encryption (SME). + +config AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT + bool "Activate AMD Secure Memory Encryption (SME) by default" + default y + depends on AMD_MEM_ENCRYPT + ---help--- + Say yes to have system memory encrypted by default if running on + an AMD processor that supports Secure Memory Encryption (SME). + + If set to Y, then the encryption of system memory can be + deactivated with the mem_encrypt=off command line option. + + If set to N, then the encryption of system memory can be + activated with the mem_encrypt=on command line option. + # Common NUMA Features config NUMA bool "Numa Memory Allocation and Scheduler Support" diff --git a/arch/x86/include/asm/mem_encrypt.h b/arch/x86/include/asm/mem_encrypt.h new file mode 100644 index 0000000..d5c4a2b --- /dev/null +++ b/arch/x86/include/asm/mem_encrypt.h @@ -0,0 +1,42 @@ +/* + * AMD Memory Encryption Support + * + * Copyright (C) 2016 Advanced Micro Devices, Inc. + * + * Author: Tom Lendacky + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef __X86_MEM_ENCRYPT_H__ +#define __X86_MEM_ENCRYPT_H__ + +#ifndef __ASSEMBLY__ + +#ifdef CONFIG_AMD_MEM_ENCRYPT + +extern unsigned long sme_me_mask; + +static inline bool sme_active(void) +{ + return !!sme_me_mask; +} + +#else /* !CONFIG_AMD_MEM_ENCRYPT */ + +#ifndef sme_me_mask +#define sme_me_mask 0UL + +static inline bool sme_active(void) +{ + return false; +} +#endif + +#endif /* CONFIG_AMD_MEM_ENCRYPT */ + +#endif /* __ASSEMBLY__ */ + +#endif /* __X86_MEM_ENCRYPT_H__ */ diff --git a/arch/x86/mm/Makefile b/arch/x86/mm/Makefile index 0fbdcb6..a94a7b6 100644 --- a/arch/x86/mm/Makefile +++ b/arch/x86/mm/Makefile @@ -39,3 +39,4 @@ obj-$(CONFIG_X86_INTEL_MPX) += mpx.o obj-$(CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS) += pkeys.o obj-$(CONFIG_RANDOMIZE_MEMORY) += kaslr.o +obj-$(CONFIG_AMD_MEM_ENCRYPT) += mem_encrypt.o diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c new file mode 100644 index 0000000..b99d469 --- /dev/null +++ b/arch/x86/mm/mem_encrypt.c @@ -0,0 +1,21 @@ +/* + * AMD Memory Encryption Support + * + * Copyright (C) 2016 Advanced Micro Devices, Inc. + * + * Author: Tom Lendacky + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include + +/* + * Since SME related variables are set early in the boot process they must + * reside in the .data section so as not to be zeroed out when the .bss + * section is later cleared. + */ +unsigned long sme_me_mask __section(.data) = 0; +EXPORT_SYMBOL_GPL(sme_me_mask); diff --git a/include/linux/mem_encrypt.h b/include/linux/mem_encrypt.h new file mode 100644 index 0000000..14a7b9f --- /dev/null +++ b/include/linux/mem_encrypt.h @@ -0,0 +1,37 @@ +/* + * AMD Memory Encryption Support + * + * Copyright (C) 2016 Advanced Micro Devices, Inc. + * + * Author: Tom Lendacky + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef __MEM_ENCRYPT_H__ +#define __MEM_ENCRYPT_H__ + +#ifndef __ASSEMBLY__ + +#ifdef CONFIG_AMD_MEM_ENCRYPT + +#include + +#else /* !CONFIG_AMD_MEM_ENCRYPT */ + +#ifndef sme_me_mask +#define sme_me_mask 0UL + +static inline bool sme_active(void) +{ + return false; +} +#endif + +#endif /* CONFIG_AMD_MEM_ENCRYPT */ + +#endif /* __ASSEMBLY__ */ + +#endif /* __MEM_ENCRYPT_H__ */ _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec