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

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Message-ID: <20200625012503.GD21758@linux.intel.com>
Date:   Thu, 25 Jun 2020 04:25:03 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     x86@...nel.org, linux-sgx@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Jethro Beekman <jethro@...tanix.com>,
        akpm@...ux-foundation.org, andriy.shevchenko@...ux.intel.com,
        asapek@...gle.com, cedric.xing@...el.com, chenalexchen@...gle.com,
        conradparker@...gle.com, cyhanish@...gle.com,
        dave.hansen@...el.com, haitao.huang@...el.com,
        josh@...htriplett.org, kai.huang@...el.com, kai.svahn@...el.com,
        kmoy@...gle.com, ludloff@...gle.com, luto@...nel.org,
        nhorman@...hat.com, npmccallum@...hat.com, puiterwijk@...hat.com,
        rientjes@...gle.com, tglx@...utronix.de, yaozhangx@...gle.com
Subject: Re: [PATCH v33 01/21] x86/cpufeatures: x86/msr: Add Intel SGX
 hardware bits

On Mon, Jun 22, 2020 at 07:37:11PM +0200, Borislav Petkov wrote:
> On Thu, Jun 18, 2020 at 01:08:23AM +0300, Jarkko Sakkinen wrote:
> > From: Sean Christopherson <sean.j.christopherson@...el.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.

Underscore must be just a typo.

> 
> > 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@...en8.de>
> > Acked-by: Jethro Beekman <jethro@...tanix.com>
> > Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
> > Co-developed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
> > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.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.

OK I reverted it [*].

> With those addressed:
> 
> Reviewed-by: Borislav Petkov <bp@...e.de>

Thank you, I'll update this to the commit.

> 
> Thx.
> 
> -- 
> Regards/Gruss,
>     Boris.
> 
> https://people.kernel.org/tglx/notes-about-netiquette

[*] By "git diff -R HEAD~1 -- tools/arch/x86/include/asm/cpufeatures.h | patch -p1".

/Jarkko