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Date:   Tue, 6 Nov 2018 08:26:55 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To:     Dave Hansen <dave.hansen@intel.com>
Cc:     x86@kernel.org, platform-driver-x86@vger.kernel.org,
        linux-sgx@vger.kernel.org, sean.j.christopherson@intel.com,
        nhorman@redhat.com, npmccallum@redhat.com, serge.ayoun@intel.com,
        shay.katz-zamir@intel.com, haitao.huang@intel.com,
        mark.shanahan@intel.com, andriy.shevchenko@linux.intel.com,
        Jonathan Corbet <corbet@lwn.net>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        "H. Peter Anvin" <hpa@zytor.com>,
        "open list:DOCUMENTATION" <linux-doc@vger.kernel.org>,
        open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v15 23/23] x86/sgx: Driver documentation
Message-ID: <20181106062655.GA18671@linux.intel.com>
References: <20181102231320.29164-1-jarkko.sakkinen@linux.intel.com>
 <20181102231320.29164-24-jarkko.sakkinen@linux.intel.com>
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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