Re: [RFC PATCH v4 03/28] x86: Add the Secure Memory Encryption CPU feature

[Borislav Petkov]

On Thu, Feb 16, 2017 at 09:42:36AM -0600, Tom Lendacky wrote:
> Update the CPU features to include identifying and reporting on the
> Secure Memory Encryption (SME) feature.  SME is identified by CPUID
> 0x8000001f, but requires BIOS support to enable it (set bit 23 of
> SYS_CFG MSR).  Only show the SME feature as available if reported by
> CPUID and enabled by BIOS.
> 
> 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/msr-index.h         |    2 ++
>  arch/x86/include/asm/required-features.h |    3 ++-
>  arch/x86/kernel/cpu/common.c             |   19 +++++++++++++++++++
>  6 files changed, 34 insertions(+), 5 deletions(-)

What happened here?

You had it already:

https://lkml.kernel.org/r/20161110003459.3280.25796.stgit@xxxxxxxxxxxxxxxxxxxxxxxxx

The bit in get_cpu_cap() with checking the MSR you can add at the end of
init_amd() for example.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.