linux-kernel - Re: [PATCH v17 18/23] platform/x86: Intel SGX driver

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Message-ID: <20181124164534.GC30310@linux.intel.com>
Date:   Sat, 24 Nov 2018 08:45:34 -0800
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     "Dr. Greg" <greg@...ellic.com>
Cc:     Andy Lutomirski <luto@...nel.org>, X86 ML <x86@...nel.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        linux-sgx@...r.kernel.org, Dave Hansen <dave.hansen@...el.com>,
        "Christopherson, Sean J" <sean.j.christopherson@...el.com>,
        nhorman@...hat.com, npmccallum@...hat.com,
        "Ayoun, Serge" <serge.ayoun@...el.com>, shay.katz-zamir@...el.com,
        haitao.huang@...ux.intel.com,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Svahn, Kai" <kai.svahn@...el.com>, mark.shanahan@...el.com,
        Suresh Siddha <suresh.b.siddha@...el.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v17 18/23] platform/x86: Intel SGX driver

On Fri, Nov 23, 2018 at 04:39:23AM -0600, Dr. Greg wrote:
> Jarkko, when this driver lands it will set the SGX ABI in stone for
> Linux.  It would be very, very helpful to the development community if
> there was some official guidance from Intel on whether or not FLC will
> be a universal feature on all hardware and the date that is going to
> happen or has happened.

I seriously don't know but I can take this message to the mothership...

> If this turns out to be an OEM selectable issue via firmware
> customizations, things will be even more problematic.

Point taken.

> As things stand now, the proposed mainline SGX driver is going to be
> useless for a lot of hardware that is out in the field.  Linux has
> always had the reputation for supporting legacy hardware so this
> directly contravenes that principal and needlessly so.

I do get your point about supporting the legacy. I'm wondering if this
is still a deal breaker for Linux or not.

/Jarkko