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

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Date:   Tue, 6 Nov 2018 08:20:02 +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 Tue, Nov 06, 2018 at 07:49:11AM +0200, Jarkko Sakkinen wrote:
> On Mon, Nov 05, 2018 at 12:27:11PM -0800, Dave Hansen wrote:
> > The ABI seems entirely undocumented and rather lightly designed, which
> > seems like something we should fix before this is merged.
> 
> ABI is documented in arch/x86/include/uapi/asm/sgx.h that from which the
> documentation is included to intel_sgx.rst. I'm not saying that there is
> no space refine it but it is neither undocumented.
> 
> > Also, for a feature as massive and complicated as this one, it seems
> > irresponsible to not have a selftest.  Is that not feasible for some reason?
> 
> I do have the in-kernel launch enclave stuff backed up here:
> 
> https://github.com/jsakkine-intel/sgx-le-host
> https://github.com/jsakkine-intel/sgx-le
> 
> This is about as simple as it gets without any type of run-time.

Of course the enclave could be simplified considerably since now it has
full code for EINITTOKEN generation, which is probably an overkill for a
selftest.

It could be simple as just enter and return to and from enclave or
something in-between in terms of complexity.

Even for the simplest enclave you need a signing tool (see sgxsign.c in
my sgx-le repository), a custom linker script and a sophisticated
makefile.

/Jarkko