From: Tom Lendacky <thomas.lendacky@amd.com>
To: linux-arch@vger.kernel.org, linux-efi@vger.kernel.org,
kvm@vger.kernel.org, linux-doc@vger.kernel.org, x86@kernel.org,
linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com,
linux-mm@kvack.org, iommu@lists.linux-foundation.org
Cc: "Radim Krčmář" <rkrcmar@redhat.com>,
"Arnd Bergmann" <arnd@arndb.de>,
"Jonathan Corbet" <corbet@lwn.net>,
"Matt Fleming" <matt@codeblueprint.co.uk>,
"Joerg Roedel" <joro@8bytes.org>,
"Konrad Rzeszutek Wilk" <konrad.wilk@oracle.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Ingo Molnar" <mingo@redhat.com>,
"Borislav Petkov" <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>,
"Andrey Ryabinin" <aryabinin@virtuozzo.com>,
"Alexander Potapenko" <glider@google.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Dmitry Vyukov" <dvyukov@google.com>
Subject: [RFC PATCH v1 03/18] x86: Secure Memory Encryption (SME) support
Date: Tue, 26 Apr 2016 17:56:26 -0500 [thread overview]
Message-ID: <20160426225626.13567.72425.stgit@tlendack-t1.amdoffice.net> (raw)
In-Reply-To: <20160426225553.13567.19459.stgit@tlendack-t1.amdoffice.net>
Provide support for Secure Memory Encryption (SME). This initial support
defines the memory encryption mask as a variable for quick access and an
accessor for retrieving the number of physical addressing bits lost if
SME is enabled.
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
---
arch/x86/include/asm/mem_encrypt.h | 37 ++++++++++++++++++++++++++++++++++++
arch/x86/kernel/Makefile | 2 ++
arch/x86/kernel/mem_encrypt.S | 29 ++++++++++++++++++++++++++++
arch/x86/kernel/x8664_ksyms_64.c | 6 ++++++
4 files changed, 74 insertions(+)
create mode 100644 arch/x86/include/asm/mem_encrypt.h
create mode 100644 arch/x86/kernel/mem_encrypt.S
diff --git a/arch/x86/include/asm/mem_encrypt.h b/arch/x86/include/asm/mem_encrypt.h
new file mode 100644
index 0000000..747fc52
--- /dev/null
+++ b/arch/x86/include/asm/mem_encrypt.h
@@ -0,0 +1,37 @@
+/*
+ * AMD Memory Encryption Support
+ *
+ * Copyright (C) 2016 Advanced Micro Devices, Inc.
+ *
+ * Author: Tom Lendacky <thomas.lendacky@amd.com>
+ *
+ * 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;
+
+u8 sme_get_me_loss(void);
+
+#else /* !CONFIG_AMD_MEM_ENCRYPT */
+
+#define sme_me_mask 0UL
+
+static inline u8 sme_get_me_loss(void)
+{
+ return 0;
+}
+
+#endif /* CONFIG_AMD_MEM_ENCRYPT */
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* __X86_MEM_ENCRYPT_H__ */
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 9abf855..11536d9 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -126,6 +126,8 @@ obj-$(CONFIG_EFI) += sysfb_efi.o
obj-$(CONFIG_PERF_EVENTS) += perf_regs.o
obj-$(CONFIG_TRACING) += tracepoint.o
+obj-y += mem_encrypt.o
+
###
# 64 bit specific files
ifeq ($(CONFIG_X86_64),y)
diff --git a/arch/x86/kernel/mem_encrypt.S b/arch/x86/kernel/mem_encrypt.S
new file mode 100644
index 0000000..ef7f325
--- /dev/null
+++ b/arch/x86/kernel/mem_encrypt.S
@@ -0,0 +1,29 @@
+/*
+ * AMD Memory Encryption Support
+ *
+ * Copyright (C) 2016 Advanced Micro Devices, Inc.
+ *
+ * Author: Tom Lendacky <thomas.lendacky@amd.com>
+ *
+ * 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 <linux/linkage.h>
+
+ .text
+ .code64
+ENTRY(sme_get_me_loss)
+ xor %rax, %rax
+ mov sme_me_loss(%rip), %al
+ ret
+ENDPROC(sme_get_me_loss)
+
+ .data
+ .align 16
+ENTRY(sme_me_mask)
+ .quad 0x0000000000000000
+sme_me_loss:
+ .byte 0x00
+ .align 8
diff --git a/arch/x86/kernel/x8664_ksyms_64.c b/arch/x86/kernel/x8664_ksyms_64.c
index cd05942..72cb689 100644
--- a/arch/x86/kernel/x8664_ksyms_64.c
+++ b/arch/x86/kernel/x8664_ksyms_64.c
@@ -11,6 +11,7 @@
#include <asm/uaccess.h>
#include <asm/desc.h>
#include <asm/ftrace.h>
+#include <asm/mem_encrypt.h>
#ifdef CONFIG_FUNCTION_TRACER
/* mcount and __fentry__ are defined in assembly */
@@ -79,3 +80,8 @@ EXPORT_SYMBOL(native_load_gs_index);
EXPORT_SYMBOL(___preempt_schedule);
EXPORT_SYMBOL(___preempt_schedule_notrace);
#endif
+
+#ifdef CONFIG_AMD_MEM_ENCRYPT
+EXPORT_SYMBOL_GPL(sme_me_mask);
+EXPORT_SYMBOL_GPL(sme_get_me_loss);
+#endif
--
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next prev parent reply other threads:[~2016-04-26 22:56 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-26 22:55 [RFC PATCH v1 00/18] x86: Secure Memory Encryption (AMD) Tom Lendacky
2016-03-22 13:00 ` Pavel Machek
[not found] ` <20160322130058.GA16528-5NIqAleC692hcjWhqY66xCZi+YwRKgec@public.gmane.org>
2016-04-27 14:05 ` Borislav Petkov
2016-04-27 14:30 ` Pavel Machek
2016-04-27 14:39 ` Borislav Petkov
[not found] ` <20160427143951.GH21011-fF5Pk5pvG8Y@public.gmane.org>
2016-04-27 14:58 ` Pavel Machek
2016-04-27 15:47 ` Pavel Machek
2016-04-27 14:21 ` Tom Lendacky
2016-04-26 22:56 ` [RFC PATCH v1 01/18] x86: Set the write-protect cache mode for AMD processors Tom Lendacky
[not found] ` <20160426225604.13567.55443.stgit-qCXWGYdRb2BnqfbPTmsdiZQ+2ll4COg0XqFh9Ls21Oc@public.gmane.org>
2016-04-27 14:33 ` Andy Lutomirski
2016-04-27 14:44 ` Tom Lendacky
2016-04-27 14:47 ` Andy Lutomirski
[not found] ` <CALCETrV+JzPZjrrqkhWSVfvKQt62Aq8NSW=ZvfdiAi8XKoLi8A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-04-27 15:05 ` Tom Lendacky
2016-04-27 15:12 ` Andy Lutomirski
2016-04-27 15:31 ` Borislav Petkov
2016-04-27 15:34 ` Andy Lutomirski
2016-04-26 22:56 ` [RFC PATCH v1 02/18] x86: Secure Memory Encryption (SME) build enablement Tom Lendacky
2016-03-22 13:01 ` Pavel Machek
2016-04-27 15:17 ` Tom Lendacky
2016-04-27 15:30 ` Pavel Machek
2016-04-27 15:41 ` Borislav Petkov
2016-04-27 16:41 ` Pavel Machek
2016-04-27 17:07 ` Robin Murphy
2016-04-27 17:12 ` Borislav Petkov
2016-04-26 22:56 ` Tom Lendacky [this message]
2016-03-22 13:03 ` [RFC PATCH v1 03/18] x86: Secure Memory Encryption (SME) support Pavel Machek
2016-04-27 16:20 ` Tom Lendacky
2016-04-26 22:56 ` [RFC PATCH v1 04/18] x86: Add the Secure Memory Encryption cpu feature Tom Lendacky
2016-04-26 22:56 ` [RFC PATCH v1 05/18] x86: Handle reduction in physical address size with SME Tom Lendacky
2016-04-26 22:56 ` [RFC PATCH v1 06/18] x86: Provide general kernel support for memory encryption Tom Lendacky
2016-04-26 22:57 ` [RFC PATCH v1 07/18] x86: Extend the early_memmap support with additional attrs Tom Lendacky
2016-04-26 22:57 ` [RFC PATCH v1 08/18] x86: Add support for early encryption/decryption of memory Tom Lendacky
2016-04-26 22:57 ` [RFC PATCH v1 09/18] x86: Insure that memory areas are encrypted when possible Tom Lendacky
2016-04-26 22:57 ` [RFC PATCH v1 10/18] x86/efi: Access EFI related tables in the clear Tom Lendacky
[not found] ` <20160426225740.13567.85438.stgit-qCXWGYdRb2BnqfbPTmsdiZQ+2ll4COg0XqFh9Ls21Oc@public.gmane.org>
2016-05-10 13:43 ` Matt Fleming
[not found] ` <20160510134358.GR2839-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>
2016-05-10 13:57 ` Borislav Petkov
2016-05-12 18:20 ` Tom Lendacky
2016-05-24 14:54 ` Tom Lendacky
2016-05-25 16:09 ` Daniel Kiper
2016-05-25 19:30 ` Matt Fleming
2016-05-26 13:45 ` Tom Lendacky
2016-06-08 10:07 ` Matt Fleming
2016-06-09 16:16 ` Tom Lendacky
2016-06-13 12:03 ` Matt Fleming
2016-06-13 12:34 ` Matt Fleming
2016-06-13 15:16 ` Tom Lendacky
2016-06-08 11:18 ` Matt Fleming
2016-06-09 18:33 ` Tom Lendacky
2016-06-13 13:51 ` Matt Fleming
[not found] ` <20160613135110.GC2658-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>
2016-06-15 13:17 ` Tom Lendacky
[not found] ` <57615561.4090502-5C7GfCeVMHo@public.gmane.org>
2016-06-16 14:38 ` Tom Lendacky
2016-06-17 15:51 ` Matt Fleming
2016-04-26 22:57 ` [RFC PATCH v1 11/18] x86: Decrypt trampoline area if memory encryption is active Tom Lendacky
2016-04-26 22:58 ` [RFC PATCH v1 12/18] x86: Access device tree in the clear Tom Lendacky
2016-04-26 22:58 ` [RFC PATCH v1 13/18] x86: DMA support for memory encryption Tom Lendacky
2016-04-29 7:17 ` Konrad Rzeszutek Wilk
2016-04-29 15:12 ` Tom Lendacky
2016-04-29 16:27 ` Konrad Rzeszutek Wilk
[not found] ` <20160429162757.GA1191-he5eyhs8q0BAdwtm4QZOy9BPR1lH4CV8@public.gmane.org>
2016-04-29 23:49 ` Tom Lendacky
2016-04-26 22:58 ` [RFC PATCH v1 14/18] iommu/amd: AMD IOMMU " Tom Lendacky
2016-04-26 22:58 ` [RFC PATCH v1 15/18] x86: Enable memory encryption on the APs Tom Lendacky
2016-05-01 22:10 ` Huang, Kai
[not found] ` <f37dd7de-23ad-f70f-c32d-a32f116215ce-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2016-05-03 15:59 ` Tom Lendacky
2016-04-26 22:58 ` [RFC PATCH v1 16/18] x86: Do not specify encrypted memory for VGA mapping Tom Lendacky
2016-04-26 22:58 ` [RFC PATCH v1 17/18] x86/kvm: Enable Secure Memory Encryption of nested page tables Tom Lendacky
2016-04-26 22:59 ` [RFC PATCH v1 18/18] x86: Add support to turn on Secure Memory Encryption Tom Lendacky
[not found] ` <20160426225904.13567.538.stgit-qCXWGYdRb2BnqfbPTmsdiZQ+2ll4COg0XqFh9Ls21Oc@public.gmane.org>
2016-03-22 13:13 ` Pavel Machek
[not found] ` <20160426225553.13567.19459.stgit-qCXWGYdRb2BnqfbPTmsdiZQ+2ll4COg0XqFh9Ls21Oc@public.gmane.org>
2016-04-27 14:39 ` [RFC PATCH v1 00/18] x86: Secure Memory Encryption (AMD) Andy Lutomirski
2016-04-27 20:10 ` Tom Lendacky
2016-05-02 18:31 ` Andy Lutomirski
2016-05-09 15:13 ` Paolo Bonzini
2016-05-09 21:08 ` Tom Lendacky
2016-05-10 11:23 ` Paolo Bonzini
2016-05-10 12:04 ` Borislav Petkov
2016-04-30 6:13 ` Elliott, Robert (Persistent Memory)
[not found] ` <94D0CD8314A33A4D9D801C0FE68B402963918FDA-wwDBVnaDRpYSZAcGdq5asR6epYMZPwEe5NbjCUgZEJk@public.gmane.org>
2016-05-03 15:55 ` Tom Lendacky
-- strict thread matches above, loose matches on Subject: below --
2016-04-26 22:45 Tom Lendacky
2016-04-26 22:45 ` [RFC PATCH v1 03/18] x86: Secure Memory Encryption (SME) support Tom Lendacky
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