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From:   Nathaniel McCallum <npmccallum@redhat.com>
Date:   Wed, 19 Aug 2020 09:33:45 -0400
Message-ID: <CAOASepMABkAxMRY7fJr4bAqadYyVrhZkb0BmB8cTcXUL_VmwQw@mail.gmail.com>
Subject: Re: [PATCH v36 21/24] x86/vdso: Implement a vDSO for Intel SGX
 enclave call
To:     Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Cc:     Sean Christopherson <sean.j.christopherson@intel.com>,
        X86 ML <x86@kernel.org>, linux-sgx@vger.kernel.org,
        LKML <linux-kernel@vger.kernel.org>,
        Andy Lutomirski <luto@amacapital.net>,
        Jethro Beekman <jethro@fortanix.com>,
        Cedric Xing <cedric.xing@intel.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        asapek@google.com, Borislav Petkov <bp@alien8.de>,
        chenalexchen@google.com, Conrad Parker <conradparker@google.com>,
        cyhanish@google.com, Dave Hansen <dave.hansen@intel.com>,
        "Huang, Haitao" <haitao.huang@intel.com>,
        Josh Triplett <josh@joshtriplett.org>,
        "Huang, Kai" <kai.huang@intel.com>,
        "Svahn, Kai" <kai.svahn@intel.com>, Keith Moyer <kmoy@google.com>,
        Christian Ludloff <ludloff@google.com>,
        Andy Lutomirski <luto@kernel.org>,
        Neil Horman <nhorman@redhat.com>,
        Patrick Uiterwijk <puiterwijk@redhat.com>,
        David Rientjes <rientjes@google.com>,
        Thomas Gleixner <tglx@linutronix.de>, yaozhangx@google.com
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On Tue, Aug 18, 2020 at 12:44 PM Jarkko Sakkinen
<jarkko.sakkinen@linux.intel.com> wrote:
>
> On Tue, Aug 18, 2020 at 11:15:32AM -0400, Nathaniel McCallum wrote:
> > That seems like overkill to me. I'm just asking for one additional mov
> > instruction. :)
>
> I started to consider eBPF since the complexity and constraints of the
> callback look like an overkill and without doubt will be a burden to
> maintain.

That feels to me like more complexity just to move the existing
complexity from one place to another.