linux-kernel - Re: RFC: userspace exception fixups

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Message-ID: <20181109071259.GA14784@infradead.org>
Date:   Thu, 8 Nov 2018 23:12:59 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Andy Lutomirski <luto@...capital.net>
Cc:     "Christopherson, Sean J" <sean.j.christopherson@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Andrew Lutomirski <luto@...nel.org>,
        Jann Horn <jannh@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Rich Felker <dalias@...c.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Jethro Beekman <jethro@...tanix.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Florian Weimer <fweimer@...hat.com>,
        Linux API <linux-api@...r.kernel.org>, X86 ML <x86@...nel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>, nhorman@...hat.com,
        npmccallum@...hat.com, "Ayoun, Serge" <serge.ayoun@...el.com>,
        shay.katz-zamir@...el.com, linux-sgx@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Carlos O'Donell <carlos@...hat.com>,
        adhemerval.zanella@...aro.org
Subject: Re: RFC: userspace exception fixups

On Thu, Nov 08, 2018 at 12:05:42PM -0800, Andy Lutomirski wrote:
> This whole thing is a mess.  I'm starting to think that the cleanest
> solution would be to provide a way to just tell the kernel that
> certain RIP values have exception fixups.

The bay far cleanest solution would be to say that SGX is sich a mess
that we are not going to support it at all.  It's not like it is a must
have a feature to start with.