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    Subject[PATCH v2 1/4] x86, cpu: Add CPU flags for SMEP
    Date
    From: Fenghua Yu <fenghua.yu@intel.com>

    Add support for newly documented SMEP (Supervisor Mode Execution Protection) CPU
    feature flags.

    Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
    ---
    arch/x86/include/asm/cpufeature.h | 1 +
    arch/x86/kernel/cpu/scattered.c | 1 +
    2 files changed, 2 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
    index 50c0d30..e773f13 100644
    --- a/arch/x86/include/asm/cpufeature.h
    +++ b/arch/x86/include/asm/cpufeature.h
    @@ -174,6 +174,7 @@
    #define X86_FEATURE_PLN (7*32+ 5) /* Intel Power Limit Notification */
    #define X86_FEATURE_PTS (7*32+ 6) /* Intel Package Thermal Status */
    #define X86_FEATURE_DTS (7*32+ 7) /* Digital Thermal Sensor */
    +#define X86_FEATURE_SMEP (7*32+ 8) /* Supervisor Mode Execution Protection*/

    /* Virtualization flags: Linux defined, word 8 */
    #define X86_FEATURE_TPR_SHADOW (8*32+ 0) /* Intel TPR Shadow */
    diff --git a/arch/x86/kernel/cpu/scattered.c b/arch/x86/kernel/cpu/scattered.c
    index c7f64e6..2de3aea 100644
    --- a/arch/x86/kernel/cpu/scattered.c
    +++ b/arch/x86/kernel/cpu/scattered.c
    @@ -38,6 +38,7 @@ void __cpuinit init_scattered_cpuid_features(struct cpuinfo_x86 *c)
    { X86_FEATURE_PTS, CR_EAX, 6, 0x00000006, 0 },
    { X86_FEATURE_APERFMPERF, CR_ECX, 0, 0x00000006, 0 },
    { X86_FEATURE_EPB, CR_ECX, 3, 0x00000006, 0 },
    + { X86_FEATURE_SMEP, CR_EBX, 7, 0x00000007, 0 },
    { X86_FEATURE_XSAVEOPT, CR_EAX, 0, 0x0000000d, 1 },
    { X86_FEATURE_CPB, CR_EDX, 9, 0x80000007, 0 },
    { X86_FEATURE_NPT, CR_EDX, 0, 0x8000000a, 0 },
    --
    1.7.2


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