linux-kernel - Re: [PATCH 02/25] x86/cpufeatures: Add SGX1 and SGX2 sub-features

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Date:   Tue, 02 Mar 2021 00:43:06 +1300
From:   Kai Huang <kai.huang@...el.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     kvm@...r.kernel.org, x86@...nel.org, linux-sgx@...r.kernel.org,
        linux-kernel@...r.kernel.org, seanjc@...gle.com, jarkko@...nel.org,
        luto@...nel.org, dave.hansen@...el.com, rick.p.edgecombe@...el.com,
        haitao.huang@...el.com, pbonzini@...hat.com, tglx@...utronix.de,
        mingo@...hat.com, hpa@...or.com
Subject: Re: [PATCH 02/25] x86/cpufeatures: Add SGX1 and SGX2 sub-features

On Mon, 2021-03-01 at 12:32 +0100, Borislav Petkov wrote:
> On Tue, Mar 02, 2021 at 12:28:27AM +1300, Kai Huang wrote:
> > I think some script can utilize /proc/cpuinfo. For instance, admin can have
> > automation tool/script to deploy enclave (with sgx2) apps, and that script can check
> > whether platform supports sgx2 or not, before it can deploy those enclave apps. Or
> > enclave author may just want to check /proc/cpuinfo to know whether the machine can
> > be used for testing sgx2 enclave or not.
> 
> This doesn't sound like a concrete use of this. So you can hide it
> initially with "" until you guys have a use case. Exposing it later is
> always easy vs exposing it now and then not being able to change it
> anymore.
> 

Hi Haitao, Jarkko,

Do you have more concrete use case of needing "sgx2" in /proc/cpuinfo?

Hi Boris,

To confirm, if we suppress both "sgx1" and "sgx2" in /proc/cpuinfo, we don't need to
add "why to suppress" in commit message, right?