linux-kernel - Re: [PATCH v14 04/19] x86/cpufeatures: Add SGX feature bits

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Message-ID: <20180927135139.GB19687@zn.tnic>
Date:   Thu, 27 Sep 2018 15:51:39 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     x86@...nel.org, platform-driver-x86@...r.kernel.org,
        dave.hansen@...el.com, sean.j.christopherson@...el.com,
        nhorman@...hat.com, npmccallum@...hat.com, serge.ayoun@...el.com,
        shay.katz-zamir@...el.com, linux-sgx@...r.kernel.org,
        andriy.shevchenko@...ux.intel.com,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        David Wang <davidwang@...oxin.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com>,
        Jia Zhang <qianyue.zj@...baba-inc.com>,
        "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" 
        <linux-kernel@...r.kernel.org>, He Chen <he.chen@...ux.intel.com>,
        Luwei Kang <luwei.kang@...el.com>, kvm@...r.kernel.org,
        Radim Krčmář <rkrcmar@...hat.com>,
        Piotr Luc <Piotr.Luc@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH v14 04/19] x86/cpufeatures: Add SGX feature bits

On Thu, Sep 27, 2018 at 04:16:42PM +0300, Jarkko Sakkinen wrote:
> Still kind of leaves me puzzled about the situation :-) Why this wasn't
> used for example to replace detect_vmx_virtcap()?

I don't understand - detect_vmx_virtcap() is setting X86_FEATURE bits
based on MSR settings. get_scattered_cpuid_leaf() is regenerating a
CPUID leaf from the scattered bits.

Looks like apples and oranges to me...

-- 
Regards/Gruss,
    Boris.

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