Add a kernel config option to enable the feature (disabled by default) at
compile-time.
Also, add a new command-line parameter -- 'nokeylocker' to disable the
feature at boot-time.
Signed-off-by: Chang S. Bae <chang.seok.bae@xxxxxxxxx>
Cc: x86@xxxxxxxxxx
Cc: linux-doc@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
Documentation/admin-guide/kernel-parameters.txt | 2 ++
arch/x86/Kconfig | 14 ++++++++++++++
arch/x86/kernel/cpu/common.c | 16 ++++++++++++++++
3 files changed, 32 insertions(+)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index cb89dbdedc46..d0afe36c1802 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -3284,6 +3284,8 @@
nohugevmalloc [PPC] Disable kernel huge vmalloc mappings.
+ nokeylocker [X86] Disables Key Locker hardware feature.
+
nosmt [KNL,S390] Disable symmetric multithreading (SMT).
Equivalent to smt=1.
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 0045e1b44190..de8eeb705ed8 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1885,6 +1885,20 @@ config X86_INTEL_MEMORY_PROTECTION_KEYS
If unsure, say y.
+config X86_KEYLOCKER
+ prompt "Key Locker"
+ def_bool n
+ depends on CPU_SUP_INTEL
+ help
+ Key Locker is a new security feature to protect data encryption
+ keys for the Advanced Encryption Standard (AES) algorithm.
+
+ When enabled, every CPU has a unique internal key to wrap AES
+ keys in an encoded format. The internal key is not accessible
+ to software once loaded.
+
+ If unsure, say y.
+
choice
prompt "TSX enable mode"
depends on CPU_SUP_INTEL
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 2e64371acb81..c655cce30c2b 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -353,6 +353,22 @@ static __always_inline void setup_umip(struct cpuinfo_x86 *c)
/* These bits should not change their value after CPU init is finished. */
static const unsigned long cr4_pinned_mask =
X86_CR4_SMEP | X86_CR4_SMAP | X86_CR4_UMIP | X86_CR4_FSGSBASE;
+
+static __init int x86_nokeylocker_setup(char *arg)
+{
+ /* Expect an exact match without trailing characters. */
+ if (strlen(arg))
+ return 0;
+
+ if (!cpu_feature_enabled(X86_FEATURE_KEYLOCKER))
+ return 1;
+
+ setup_clear_cpu_cap(X86_FEATURE_KEYLOCKER);
+ pr_info("x86/keylocker: Disabled by kernel command line.\n");
+ return 1;
+}
+__setup("nokeylocker", x86_nokeylocker_setup);
+
static DEFINE_STATIC_KEY_FALSE_RO(cr_pinning);
static unsigned long cr4_pinned_bits __ro_after_init;
--
2.17.1
