Add CONFIG_X86_KEYLOCKER to gate whether Key Locker is initialized at boot. The option is selected by the Key Locker cipher module CRYPTO_AES_KL (to be added in a later patch).
Add a new command line option "nokeylocker" to optionally override the default CONFIG_X86_KEYLOCKER=y behavior. Signed-off-by: Chang S. Bae <[email protected]> Reviewed-by: Dan Williams <[email protected]> Cc: [email protected] Cc: [email protected] --- Changes from RFC v2: * Make the option selected by CRYPTO_AES_KL. (Dan Williams) * Massage the changelog and the config option description. --- Documentation/admin-guide/kernel-parameters.txt | 2 ++ arch/x86/Kconfig | 3 +++ arch/x86/kernel/cpu/common.c | 16 ++++++++++++++++ 3 files changed, 21 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 2fba82431efb..30ed18fbdea3 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -3405,6 +3405,8 @@ nohugevmalloc [PPC] Disable kernel huge vmalloc mappings. + nokeylocker [X86] Disable 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 5c2ccb85f2ef..191bd4a941eb 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1864,6 +1864,9 @@ config X86_INTEL_MEMORY_PROTECTION_KEYS If unsure, say y. +config X86_KEYLOCKER + bool + 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 23b4aa437c1e..db1fc9ff0fe3 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -364,6 +364,22 @@ 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 -- dm-devel mailing list [email protected] https://listman.redhat.com/mailman/listinfo/dm-devel
