On 09/02/2016 09:09 AM, Borislav Petkov wrote:
> On Mon, Aug 22, 2016 at 05:36:22PM -0500, Tom Lendacky wrote:
>> Update the cpu features to include identifying and reporting on the
>> Secure Memory Encryption feature.
>>
>> Signed-off-by: Tom Lendacky <thomas.lendacky@xxxxxxx>
>> ---
>> arch/x86/include/asm/cpufeature.h | 7 +++++--
>> arch/x86/include/asm/cpufeatures.h | 5 ++++-
>> arch/x86/include/asm/disabled-features.h | 3 ++-
>> arch/x86/include/asm/required-features.h | 3 ++-
>> arch/x86/kernel/cpu/scattered.c | 1 +
>> 5 files changed, 14 insertions(+), 5 deletions(-)
>
> ...
>
>> diff --git a/arch/x86/kernel/cpu/scattered.c b/arch/x86/kernel/cpu/scattered.c
>> index 8cb57df..d86d9a5 100644
>> --- a/arch/x86/kernel/cpu/scattered.c
>> +++ b/arch/x86/kernel/cpu/scattered.c
>> @@ -37,6 +37,7 @@ void init_scattered_cpuid_features(struct cpuinfo_x86 *c)
>> { X86_FEATURE_HW_PSTATE, CR_EDX, 7, 0x80000007, 0 },
>> { X86_FEATURE_CPB, CR_EDX, 9, 0x80000007, 0 },
>> { X86_FEATURE_PROC_FEEDBACK, CR_EDX,11, 0x80000007, 0 },
>> + { X86_FEATURE_SME, CR_EAX, 0, 0x8000001f, 0 },
>
> If this is in scattered CPUID features, it doesn't need any of the
> (snipped) changes above - you solely need to reuse one of the free
> defines, i.e., something like this:
Ok, that's much easier. I'll do that.
Thanks,
Tom
>
> ---
> --- a/arch/x86/include/asm/cpufeatures.h 2016-09-02 15:49:08.853374323 +0200
> +++ b/arch/x86/include/asm/cpufeatures.h 2016-09-02 15:52:34.477365610 +0200
> @@ -100,7 +100,7 @@
> #define X86_FEATURE_XTOPOLOGY ( 3*32+22) /* cpu topology enum extensions */
> #define X86_FEATURE_TSC_RELIABLE ( 3*32+23) /* TSC is known to be reliable */
> #define X86_FEATURE_NONSTOP_TSC ( 3*32+24) /* TSC does not stop in C states */
> -/* free, was #define X86_FEATURE_CLFLUSH_MONITOR ( 3*32+25) * "" clflush reqd with monitor */
> +#define X86_FEATURE_SME ( 3*32+25) /* Secure Memory Encryption */
> #define X86_FEATURE_EXTD_APICID ( 3*32+26) /* has extended APICID (8 bits) */
> #define X86_FEATURE_AMD_DCM ( 3*32+27) /* multi-node processor */
> #define X86_FEATURE_APERFMPERF ( 3*32+28) /* APERFMPERF */
> --- a/arch/x86/kernel/cpu/scattered.c 2016-09-02 15:48:52.753375005 +0200
> +++ b/arch/x86/kernel/cpu/scattered.c 2016-09-02 15:51:32.437368239 +0200
> @@ -37,6 +37,7 @@ void init_scattered_cpuid_features(struc
> { X86_FEATURE_HW_PSTATE, CR_EDX, 7, 0x80000007, 0 },
> { X86_FEATURE_CPB, CR_EDX, 9, 0x80000007, 0 },
> { X86_FEATURE_PROC_FEEDBACK, CR_EDX,11, 0x80000007, 0 },
> + { X86_FEATURE_SME, CR_EAX, 0, 0x8000001f, 0 },
> { 0, 0, 0, 0, 0 }
> };
>
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