Re: [PATCH v33 01/21] x86/cpufeatures: x86/msr: Add Intel SGX hardware bits

Borislav Petkov
2020-06-22T17:37:23Z

On Thu, Jun 18, 2020 at 01:08:23AM +0300, Jarkko Sakkinen wrote:
> From: Sean Christopherson <sean.j.christopherson@intel.com>
>
> Add X86_FEATURE_SGX from CPUID.(EAX=7, ECX=1), which informs whether the
> CPU has SGX.
>
> Add X86_FEATURE_SGX1 and X86_FEATURE_SGX2 from CPUID.(EAX=12H, ECX=0),
> which describe the level of SGX support available [1].
>
> Add IA32_FEATURE_CONTROL_SGX_ENABLE. BIOS can use this bit to opt-in SGX

I'm guessing that wants to be

IA32_FEATURE_CONTROL.SGX_ENABLE

judging by the diff and the SDM chapter.

> before locking the feature control MSR [2].
>
> [1] Intel SDM: 36.7.2 Intel® SGX Resource Enumeration Leaves
> [2] Intel SDM: 36.7.1 Intel® SGX Opt-In Configuration
>
> Cc: Borislav Petkov <bp@alien8.de>
> Acked-by: Jethro Beekman <jethro@fortanix.com>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> Co-developed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> ---
> arch/x86/include/asm/cpufeature.h | 5 +++--
> arch/x86/include/asm/cpufeatures.h | 7 ++++++-
> arch/x86/include/asm/disabled-features.h | 18 +++++++++++++++---
> arch/x86/include/asm/msr-index.h | 1 +
> arch/x86/include/asm/required-features.h | 2 +-
> arch/x86/kernel/cpu/common.c | 4 ++++
> tools/arch/x86/include/asm/cpufeatures.h | 7 ++++++-

Also, please drop this change to tools/, see

https://lkml.kernel.org/r/20200622141737.GA30611@kernel.org

from today.

With those addressed:

Reviewed-by: Borislav Petkov <bp@suse.de>

Thx.

--
Regards/Gruss,
Boris.