linux-kernel - Re: [PATCH v36 21/24] x86/vdso: Implement a vDSO for Intel SGX enclave call

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Message-ID: <CAOASepMABkAxMRY7fJr4bAqadYyVrhZkb0BmB8cTcXUL_VmwQw@mail.gmail.com>
Date:   Wed, 19 Aug 2020 09:33:45 -0400
From:   Nathaniel McCallum <npmccallum@...hat.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        X86 ML <x86@...nel.org>, linux-sgx@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...capital.net>,
        Jethro Beekman <jethro@...tanix.com>,
        Cedric Xing <cedric.xing@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        asapek@...gle.com, Borislav Petkov <bp@...en8.de>,
        chenalexchen@...gle.com, Conrad Parker <conradparker@...gle.com>,
        cyhanish@...gle.com, Dave Hansen <dave.hansen@...el.com>,
        "Huang, Haitao" <haitao.huang@...el.com>,
        Josh Triplett <josh@...htriplett.org>,
        "Huang, Kai" <kai.huang@...el.com>,
        "Svahn, Kai" <kai.svahn@...el.com>, Keith Moyer <kmoy@...gle.com>,
        Christian Ludloff <ludloff@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Neil Horman <nhorman@...hat.com>,
        Patrick Uiterwijk <puiterwijk@...hat.com>,
        David Rientjes <rientjes@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>, yaozhangx@...gle.com
Subject: Re: [PATCH v36 21/24] x86/vdso: Implement a vDSO for Intel SGX
 enclave call

On Tue, Aug 18, 2020 at 12:44 PM Jarkko Sakkinen
<jarkko.sakkinen@...ux.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.