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

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Message-ID: <20181106062655.GA18671@linux.intel.com>
Date:   Tue, 6 Nov 2018 08:26:55 +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 Mon, Nov 05, 2018 at 12:27:11PM -0800, Dave Hansen wrote:
> This patch set establishes an ABI.  It basically sets in stone a bunch
> of behaviors that the enclave, the kernel, and the out-of-enclave code
> must follow.
> 
> There are a bunch of things that the enclave can do to %rsp or %rip, for
> instance, that it is capable and/or permitted to do.

Just want to ask a follow-up from this so that I understand you better.
Now we are talking abou ioctl API, right? I'm not exactly sure how
EENTER/EEXIT/ERESUME behavior connects to that. I understand the tail
of your message but this paragraph left me a bit puzzled...

/Jarkko