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SubjectRe: [PATCH v2 1/4] x86, cpu: Add CPU flags for SMEP
On 05/16/2011 02:34 PM, Fenghua Yu wrote:
> 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 },

The level 7 flags are not considered "scattered"; they have their own
word; please use it.

-hpa

--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.



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