From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: x86@kernel.org, platform-driver-x86@vger.kernel.org
Cc: dave.hansen@intel.com, sean.j.christopherson@intel.com,
nhorman@redhat.com, npmccallum@redhat.com,
Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
Vikas Shivappa <vikas.shivappa@linux.intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Andi Kleen <ak@linux.intel.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
linux-kernel@vger.kernel.org (open list:X86 ARCHITECTURE (32-BIT
AND 64-BIT)),
intel-sgx-kernel-dev@lists.01.org (open list:INTEL SGX)
Subject: [PATCH v11 07/13] x86, sgx: detect Intel SGX
Date: Fri, 8 Jun 2018 19:09:42 +0200 [thread overview]
Message-ID: <20180608171216.26521-8-jarkko.sakkinen@linux.intel.com> (raw)
In-Reply-To: <20180608171216.26521-1-jarkko.sakkinen@linux.intel.com>
From: Sean Christopherson <sean.j.christopherson@intel.com>
Intel(R) SGX is a set of CPU instructions that can be used by applications
to set aside private regions of code and data. The code outside the enclave
is disallowed to access the memory inside the enclave by the CPU access
control.
This commit adds the check for SGX to arch/x86 and a new config option,
INTEL_SGX_CORE. Exposes a boolean variable 'sgx_enabled' to query whether
or not the SGX support is available.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
arch/x86/Kconfig | 19 ++++++++++++
arch/x86/include/asm/sgx.h | 25 ++++++++++++++++
arch/x86/include/asm/sgx_pr.h | 20 +++++++++++++
arch/x86/kernel/cpu/Makefile | 1 +
arch/x86/kernel/cpu/intel_sgx.c | 53 +++++++++++++++++++++++++++++++++
5 files changed, 118 insertions(+)
create mode 100644 arch/x86/include/asm/sgx.h
create mode 100644 arch/x86/include/asm/sgx_pr.h
create mode 100644 arch/x86/kernel/cpu/intel_sgx.c
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index c07f492b871a..42015d5366ef 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1925,6 +1925,25 @@ config X86_INTEL_MEMORY_PROTECTION_KEYS
If unsure, say y.
+config INTEL_SGX_CORE
+ prompt "Intel SGX core functionality"
+ def_bool n
+ depends on X86_64 && CPU_SUP_INTEL
+ help
+ Intel Software Guard eXtensions (SGX) is a set of CPU instructions
+ that allows ring 3 applications to create enclaves; private regions
+ of memory that are protected, by hardware, from unauthorized access
+ and/or modification.
+
+ This option enables kernel recognition of SGX, high-level management
+ of the Enclave Page Cache (EPC), tracking and writing of SGX Launch
+ Enclave Hash MSRs, and allows for virtualization of SGX via KVM. By
+ iteslf, this option does not provide SGX support to userspace.
+
+ For details, see Documentation/x86/intel_sgx.rst
+
+ If unsure, say N.
+
config EFI
bool "EFI runtime service support"
depends on ACPI
diff --git a/arch/x86/include/asm/sgx.h b/arch/x86/include/asm/sgx.h
new file mode 100644
index 000000000000..fa3e6e0eb8af
--- /dev/null
+++ b/arch/x86/include/asm/sgx.h
@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
+// Copyright(c) 2016-18 Intel Corporation.
+//
+// Authors:
+//
+// Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
+// Suresh Siddha <suresh.b.siddha@intel.com>
+// Sean Christopherson <sean.j.christopherson@intel.com>
+
+#ifndef _ASM_X86_SGX_H
+#define _ASM_X86_SGX_H
+
+#include <linux/types.h>
+
+#define SGX_CPUID 0x12
+
+enum sgx_cpuid {
+ SGX_CPUID_CAPABILITIES = 0,
+ SGX_CPUID_ATTRIBUTES = 1,
+ SGX_CPUID_EPC_BANKS = 2,
+};
+
+extern bool sgx_enabled;
+
+#endif /* _ASM_X86_SGX_H */
diff --git a/arch/x86/include/asm/sgx_pr.h b/arch/x86/include/asm/sgx_pr.h
new file mode 100644
index 000000000000..876dc44c2ccc
--- /dev/null
+++ b/arch/x86/include/asm/sgx_pr.h
@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
+// Copyright(c) 2016-17 Intel Corporation.
+//
+// Authors:
+//
+// Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
+// Suresh Siddha <suresh.b.siddha@intel.com>
+// Serge Ayoun <serge.ayoun@intel.com>
+// Shay Katz-zamir <shay.katz-zamir@intel.com>
+
+#ifndef _ASM_X86_SGX_PR_H
+#define _ASM_X86_SGX_PR_H
+
+#include <linux/printk.h>
+#include <linux/ratelimit.h>
+
+#undef pr_fmt
+#define pr_fmt(fmt) "intel_sgx: " fmt
+
+#endif /* _ASM_X86_SGX_PR_H */
diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
index a66229f51b12..9552ff5b4ec3 100644
--- a/arch/x86/kernel/cpu/Makefile
+++ b/arch/x86/kernel/cpu/Makefile
@@ -36,6 +36,7 @@ obj-$(CONFIG_CPU_SUP_TRANSMETA_32) += transmeta.o
obj-$(CONFIG_CPU_SUP_UMC_32) += umc.o
obj-$(CONFIG_INTEL_RDT) += intel_rdt.o intel_rdt_rdtgroup.o intel_rdt_monitor.o intel_rdt_ctrlmondata.o
+obj-$(CONFIG_INTEL_SGX_CORE) += intel_sgx.o
obj-$(CONFIG_X86_MCE) += mcheck/
obj-$(CONFIG_MTRR) += mtrr/
diff --git a/arch/x86/kernel/cpu/intel_sgx.c b/arch/x86/kernel/cpu/intel_sgx.c
new file mode 100644
index 000000000000..db6b315334f4
--- /dev/null
+++ b/arch/x86/kernel/cpu/intel_sgx.c
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
+// Copyright(c) 2016-17 Intel Corporation.
+//
+// Authors:
+//
+// Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
+// Suresh Siddha <suresh.b.siddha@intel.com>
+// Serge Ayoun <serge.ayoun@intel.com>
+// Shay Katz-zamir <shay.katz-zamir@intel.com>
+// Sean Christopherson <sean.j.christopherson@intel.com>
+
+#include <asm/sgx.h>
+#include <asm/sgx_pr.h>
+#include <linux/freezer.h>
+#include <linux/highmem.h>
+#include <linux/kthread.h>
+#include <linux/ratelimit.h>
+#include <linux/sched/signal.h>
+#include <linux/slab.h>
+
+bool sgx_enabled __ro_after_init = false;
+EXPORT_SYMBOL(sgx_enabled);
+
+static __init bool sgx_is_enabled(void)
+{
+ unsigned long fc;
+
+ if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
+ return false;
+
+ if (!boot_cpu_has(X86_FEATURE_SGX))
+ return false;
+
+ if (!boot_cpu_has(X86_FEATURE_SGX1))
+ return false;
+
+ rdmsrl(MSR_IA32_FEATURE_CONTROL, fc);
+ if (!(fc & FEATURE_CONTROL_LOCKED))
+ return false;
+
+ if (!(fc & FEATURE_CONTROL_SGX_ENABLE))
+ return false;
+
+ return true;
+}
+
+static __init int sgx_init(void)
+{
+ sgx_enabled = sgx_is_enabled();
+ return 0;
+}
+
+arch_initcall(sgx_init);
--
2.17.0
next prev parent reply other threads:[~2018-06-08 17:20 UTC|newest]
Thread overview: 104+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-08 17:09 [PATCH v11 00/13] Intel SGX1 support Jarkko Sakkinen
2018-06-08 17:09 ` [PATCH v11 01/13] compiler.h, kasan: add __SANITIZE_ADDRESS__ check for __no_kasan_or_inline Jarkko Sakkinen
2018-06-08 17:09 ` [PATCH v11 02/13] x86, sgx: updated MAINTAINERS Jarkko Sakkinen
2018-06-08 17:09 ` [PATCH v11 03/13] x86, sgx: add SGX definitions to cpufeature Jarkko Sakkinen
2018-06-08 17:09 ` [PATCH v11 04/13] x86, sgx: add SGX definitions to msr-index.h Jarkko Sakkinen
2018-06-08 17:25 ` Dave Hansen
2018-06-19 13:18 ` Jarkko Sakkinen
2018-06-19 14:01 ` Dave Hansen
2018-06-21 17:22 ` Jarkko Sakkinen
2018-06-08 17:09 ` [PATCH v11 05/13] x86, cpufeatures: add Intel-defined SGX leaf CPUID_12_EAX Jarkko Sakkinen
2018-06-08 17:09 ` [PATCH v11 06/13] crypto: aesni: add minimal build option for SGX LE Jarkko Sakkinen
2018-06-08 17:27 ` Dave Hansen
2018-06-11 15:24 ` Sean Christopherson
2018-06-08 17:09 ` Jarkko Sakkinen [this message]
2018-06-08 17:36 ` [PATCH v11 07/13] x86, sgx: detect Intel SGX Dave Hansen
2018-06-18 21:36 ` [intel-sgx-kernel-dev] " Andy Lutomirski
2018-06-25 7:39 ` Jarkko Sakkinen
2018-06-19 13:33 ` Jarkko Sakkinen
2018-06-11 11:35 ` Neil Horman
2018-06-19 13:34 ` Jarkko Sakkinen
2018-06-08 17:09 ` [PATCH v11 08/13] x86, sgx: added ENCLS wrappers Jarkko Sakkinen
2018-06-08 17:43 ` Dave Hansen
2018-06-19 13:25 ` Jarkko Sakkinen
2018-06-20 13:12 ` Sean Christopherson
2018-06-25 9:16 ` Jarkko Sakkinen
2018-06-08 17:09 ` [PATCH v11 09/13] x86, sgx: basic routines for enclave page cache Jarkko Sakkinen
2018-06-08 18:21 ` Jethro Beekman
2018-06-18 21:33 ` [intel-sgx-kernel-dev] " Andy Lutomirski
2018-06-25 7:36 ` Jarkko Sakkinen
2018-06-19 14:08 ` Jarkko Sakkinen
2018-06-19 15:44 ` Jethro Beekman
2018-06-08 18:24 ` Dave Hansen
2018-06-19 14:57 ` Jarkko Sakkinen
2018-06-19 15:19 ` Neil Horman
2018-06-19 15:32 ` Dave Hansen
2018-06-25 9:01 ` Jarkko Sakkinen
2018-06-19 15:59 ` Sean Christopherson
2018-06-25 9:14 ` Jarkko Sakkinen
2018-06-10 5:32 ` [intel-sgx-kernel-dev] " Andy Lutomirski
2018-06-11 15:12 ` Sean Christopherson
2018-06-20 13:21 ` Sean Christopherson
2018-06-25 9:21 ` Jarkko Sakkinen
2018-06-25 16:14 ` Neil Horman
2018-06-20 15:26 ` Sean Christopherson
2018-06-25 9:21 ` Jarkko Sakkinen
2018-06-08 17:09 ` [PATCH v11 10/13] intel_sgx: driver for Intel Software Guard Extensions Jarkko Sakkinen
2018-06-08 19:35 ` Dave Hansen
2018-06-19 13:29 ` Jarkko Sakkinen
2018-06-08 17:09 ` [PATCH v11 11/13] intel_sgx: ptrace() support Jarkko Sakkinen
2018-06-08 18:34 ` Dave Hansen
2018-06-11 15:02 ` Sean Christopherson
2018-06-19 13:38 ` Jarkko Sakkinen
2018-06-08 17:09 ` [PATCH v11 12/13] intel_sgx: driver documentation Jarkko Sakkinen
2018-06-08 18:32 ` Jethro Beekman
2018-06-19 13:30 ` Jarkko Sakkinen
2018-06-08 21:41 ` Randy Dunlap
2018-06-19 13:31 ` Jarkko Sakkinen
2018-06-08 17:09 ` [PATCH v11 13/13] intel_sgx: in-kernel launch enclave Jarkko Sakkinen
2018-06-08 18:50 ` [intel-sgx-kernel-dev] " Andy Lutomirski
2018-06-19 15:05 ` Jarkko Sakkinen
2018-06-10 5:39 ` Andy Lutomirski
2018-06-11 5:17 ` Andy Lutomirski
2018-06-11 11:52 ` Neil Horman
2018-06-12 4:55 ` Andy Lutomirski
2018-06-12 17:45 ` Neil Horman
2018-06-18 21:58 ` Andy Lutomirski
2018-06-19 13:17 ` Neil Horman
2018-06-20 16:28 ` Nathaniel McCallum
2018-06-20 18:16 ` Jethro Beekman
2018-06-20 18:39 ` Jethro Beekman
2018-06-20 21:01 ` Sean Christopherson
2018-06-21 12:32 ` Nathaniel McCallum
2018-06-21 15:29 ` Neil Horman
2018-06-21 19:11 ` Nathaniel McCallum
2018-06-21 21:20 ` Sean Christopherson
2018-06-25 21:00 ` Nathaniel McCallum
2018-06-25 22:35 ` Sean Christopherson
2018-06-21 22:48 ` Andy Lutomirski
2018-06-25 21:06 ` Nathaniel McCallum
2018-06-25 23:40 ` Andy Lutomirski
2018-06-25 9:41 ` Jarkko Sakkinen
2018-06-25 15:45 ` Andy Lutomirski
2018-06-25 21:28 ` Nathaniel McCallum
2018-06-26 8:43 ` Jarkko Sakkinen
2018-06-26 15:01 ` Nathaniel McCallum
2018-06-27 15:31 ` Jarkko Sakkinen
2018-06-21 12:12 ` Nathaniel McCallum
2018-06-25 9:27 ` Jarkko Sakkinen
2018-06-25 21:26 ` Nathaniel McCallum
2018-06-20 7:23 ` Jarkko Sakkinen
2018-06-12 10:50 ` [PATCH v11 00/13] Intel SGX1 support Pavel Machek
2018-06-19 14:59 ` Jarkko Sakkinen
2018-06-19 20:04 ` Pavel Machek
2018-06-19 20:23 ` Peter Zijlstra
2018-06-19 21:48 ` Josh Triplett
2018-12-09 20:06 ` Pavel Machek
2018-12-10 7:47 ` Josh Triplett
2018-12-10 8:27 ` Pavel Machek
2018-12-10 23:12 ` Josh Triplett
2018-12-11 18:10 ` Dave Hansen
2018-12-11 18:31 ` Sean Christopherson
2018-06-19 20:36 ` Peter Zijlstra
2018-06-21 12:55 ` Ingo Molnar
2018-06-25 9:44 ` Jarkko Sakkinen
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