linux-kernel - Re: [PATCH v15 23/23] x86/sgx: Driver documentation

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Message-ID: <20181113151316.GA3796@linux.intel.com>
Date:   Tue, 13 Nov 2018 17:13:16 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     x86@...nel.org, platform-driver-x86@...r.kernel.org,
        linux-sgx@...r.kernel.org, sean.j.christopherson@...el.com,
        nhorman@...hat.com, npmccallum@...hat.com, serge.ayoun@...el.com,
        shay.katz-zamir@...el.com, haitao.huang@...el.com,
        mark.shanahan@...el.com, andriy.shevchenko@...ux.intel.com,
        Jonathan Corbet <corbet@....net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v15 23/23] x86/sgx: Driver documentation

On Thu, Nov 08, 2018 at 09:20:40PM +0200, Jarkko Sakkinen wrote:
> On Thu, Nov 08, 2018 at 04:39:42PM +0200, Jarkko Sakkinen wrote:
> > On Wed, Nov 07, 2018 at 09:09:37AM -0800, Dave Hansen wrote:
> > > On 11/7/18 8:30 AM, Jarkko Sakkinen wrote:
> > > >> Does this code run when I type "make kselftest"?  If not, I think we
> > > >> should rectify that.
> > > > No, it doesn't. It is just my backup for the non-SDK user space code
> > > > that I've made that I will use to fork my user space SGX projects in
> > > > the future.
> > > > 
> > > > I can work-out a selftest (and provide a new patch in the series) but
> > > > I'm still wondering what the enclave should do. I would suggest that
> > > > we start with an enclave that does just EEXIT and nothing else.
> > > 
> > > Yeah, that's a start.  But, a good selftest would include things like
> > > faults and error conditions.
> > 
> > Great. We can add more entry points to the enclave for different tests
> > but I'll start with a bare minimum. And yeah but ever goes into next
> > version I'll document the fault handling.
> 
> For the v17 I'll add exactly two test cases:
> 
> 1. EENTER/EEXIT
> 2. EENTER/exception
> 
> So that it will easier to evaluate and demonstrate exception handling.
> 
> /Jarkko

Here is my test program now:

https://github.com/jsakkine-intel/sgx-selftest

It is ~1100 lines ATM. Next I'll deploy it to the kernel tree. It has
only (1) now but I'll add (2) too when I convert this to a kernel patch
(probably by doing sgx_call() with a NULL pointer).

/Jarkko