From mboxrd@z Thu Jan  1 00:00:00 1970
From: Borislav Petkov <bp@alien8.de>
Subject: Re: [PATCH v14 04/19] x86/cpufeatures: Add SGX feature bits
Date: Wed, 26 Sep 2018 13:36:17 +0200
Message-ID: <20180926113617.GD5584@zn.tnic>
References: <20180925130845.9962-1-jarkko.sakkinen@linux.intel.com>
 <20180925130845.9962-5-jarkko.sakkinen@linux.intel.com>
 <20180925164854.GF23986@zn.tnic>
 <20180926111139.GA12037@linux.intel.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8
Cc: x86@kernel.org, platform-driver-x86@vger.kernel.org,
        dave.hansen@intel.com, sean.j.christopherson@intel.com,
        nhorman@redhat.com, npmccallum@redhat.com, serge.ayoun@intel.com,
        shay.katz-zamir@intel.com, linux-sgx@vger.kernel.org,
        andriy.shevchenko@linux.intel.com,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        David Woodhouse <dwmw@amazon.co.uk>,
        David Wang <davidwang@zhaoxin.com>,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com>,
        Jia Zhang <qianyue.zj@alibaba-inc.com>,
        "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
        <linux-kernel@vger.kernel.org>, He Chen <he.chen@linux.intel.com>,
        Lu
To: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Return-path: <linux-kernel-owner@vger.kernel.org>
Content-Disposition: inline
In-Reply-To: <20180926111139.GA12037@linux.intel.com>
Sender: linux-kernel-owner@vger.kernel.org
List-Id: kvm.vger.kernel.org

On Wed, Sep 26, 2018 at 02:11:39PM +0300, Jarkko Sakkinen wrote:
> Thank you. I guess I understand what you want me to do i.e.
> 
> +       { X86_FEATURE_SGX1,             CPUID_EAX,  0, 0x00000012, 0 },
> +       { X86_FEATURE_SGX2,             CPUID_EAX,  1, 0x00000012, 0 },
> +       { X86_FEATURE_ENCLV,            CPUID_EAX,  5, 0x00000012, 0 },
> +       { X86_FEATURE_ENCLS_C,          CPUID_EAX,  6, 0x00000012, 0 },

Yap.

> What puzzles me is that I cannot find any call site for
> get_scattered_cpuid_leaf():
> 
> $ git grep get_scattered
> arch/x86/kernel/cpu/cpu.h:extern u32 get_scattered_cpuid_leaf(unsigned int level,
> arch/x86/kernel/cpu/scattered.c:u32 get_scattered_cpuid_leaf(unsigned int level, unsigned int sub_leaf,
> arch/x86/kernel/cpu/scattered.c:EXPORT_SYMBOL_GPL(get_scattered_cpuid_leaf);

That used to be used in kvm last, see b7b27aa011a1df42728d1768fc181d9ce69e6911,
which removed it.

And it got added by

  47bdf3378d62 ("x86/cpuid: Provide get_scattered_cpuid_leaf()")

Lemme add those people to CC.

If no one wants it, feel free to decomission it.

-- 
Regards/Gruss,
    Boris.

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