linux-kernel - Re: [PATCH v6 04/11] x86: define IA32_FEATUE_CONTROL.SGX

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Date:   Tue, 28 Nov 2017 09:16:11 -0800
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        platform-driver-x86@...r.kernel.org, x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...e.de>,
        Janakarajan Natarajan <Janakarajan.Natarajan@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Kyle Huey <me@...ehuey.com>,
        Vikas Shivappa <vikas.shivappa@...ux.intel.com>,
        Piotr Luc <piotr.luc@...el.com>,
        Grzegorz Andrejczuk <grzegorz.andrejczuk@...el.com>
Subject: Re: [PATCH v6 04/11] x86: define IA32_FEATUE_CONTROL.SGX_LC

On Sat, 2017-11-25 at 21:29 +0200, Jarkko Sakkinen wrote:
> When IA32_FEATURE_CONTROL.SGX_LC identifies that the root key for
> enclave signatures can be configured either by the OS or pre-boot
> firmware.
> 
> If this the case, IA32_SGXLEPUBKEYHASHn MSRs (0 < n < 4) can be used
> to
> set the SHA256 of the root key. IA32_FEATURE_CONTROL bit 17 controls
> whether the MSRs are writable by the OS. The pre-boot firmware can
> decided whether to  set this bit before setting
> IA32_FEATURE_CONTROL.LOCK.

The commit message (feature control bit) doesn't match the patch (CPUID
bit).

> 
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
> ---
>  arch/x86/include/asm/cpufeatures.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/x86/include/asm/cpufeatures.h
> b/arch/x86/include/asm/cpufeatures.h
> index 31a7d1c0f204..43130f3c18a1 100644
> --- a/arch/x86/include/asm/cpufeatures.h
> +++ b/arch/x86/include/asm/cpufeatures.h
> @@ -298,6 +298,7 @@
>  #define X86_FEATURE_AVX512_VPOPCNTDQ (16*32+14) /* POPCNT for vectors
> of DW/QW */
>  #define X86_FEATURE_LA57	(16*32+16) /* 5-level page tables */
>  #define X86_FEATURE_RDPID	(16*32+22) /* RDPID instruction */
> +#define X86_FEATURE_SGX_LC	(16*32+30) /* supports SGX launch
> configuration */
>  
>  /* AMD-defined CPU features, CPUID level 0x80000007 (ebx), word 17 */
>  #define X86_FEATURE_OVERFLOW_RECOV (17*32+0) /* MCA overflow recovery
> support */