linux-kernel - Re: [PATCH v19,RESEND 16/27] x86/sgx: Add the Linux SGX Enclave Driver

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Date:   Tue, 26 Mar 2019 07:54:52 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     "Huang, Kai" <kai.huang@...el.com>,
        "jarkko.sakkinen@...ux.intel.com" <jarkko.sakkinen@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-sgx@...r.kernel.org" <linux-sgx@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "Svahn, Kai" <kai.svahn@...el.com>,
        "nhorman@...hat.com" <nhorman@...hat.com>,
        "josh@...htriplett.org" <josh@...htriplett.org>,
        "suresh.b.siddha@...el.com" <suresh.b.siddha@...el.com>,
        "Ayoun, Serge" <serge.ayoun@...el.com>,
        "Huang, Haitao" <haitao.huang@...el.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "npmccallum@...hat.com" <npmccallum@...hat.com>,
        "rientjes@...gle.com" <rientjes@...gle.com>,
        "luto@...nel.org" <luto@...nel.org>,
        "Katz-zamir, Shay" <shay.katz-zamir@...el.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "andriy.shevchenko@...ux.intel.com" 
        <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH v19,RESEND 16/27] x86/sgx: Add the Linux SGX Enclave
 Driver

On Tue, Mar 26, 2019 at 01:40:57PM +0100, Thomas Gleixner wrote:
> On Tue, 26 Mar 2019, Huang, Kai wrote:
> > On Wed, 2019-03-20 at 18:21 +0200, Jarkko Sakkinen wrote:
> > >  13 files changed, 1657 insertions(+), 2 deletions(-)
> > >  create mode 100644 arch/x86/include/uapi/asm/sgx.h
> > >  create mode 100644 arch/x86/kernel/cpu/sgx/driver/Makefile
> > >  create mode 100644 arch/x86/kernel/cpu/sgx/driver/driver.h
> > >  create mode 100644 arch/x86/kernel/cpu/sgx/driver/ioctl.c
> > >  create mode 100644 arch/x86/kernel/cpu/sgx/driver/main.c
> > >  create mode 100644 arch/x86/kernel/cpu/sgx/encl.c
> > >  create mode 100644 arch/x86/kernel/cpu/sgx/encl.h
> > 
> > Shouldn't the driver be located somewhere under drivers/, but not under arch/x86?
> > 
> > I don't think x86 maintainers should have the burden to review every code
> > change made to SGX driver?
> 
> I rather prefer to have it in x86. Why? Because driver code has a tendency
> to get under the radar.

And having everything under arch/x86 will likely reduce the maintenance
burden for everyone:

   - Doesn't require taking changes through multiple trees or coordinating
     acks from multiple maintainers.

   - Significantly reduces the number of functions, macros, structs and
     variables that needs to be exposed in asm/sgx.h (actually eliminates
     it entirely at this point) which allows for sane code organization as
     opposed to dumping everything in one big header.

   - Mostly avoids bikeshedding over whether something is architectural
     or belongs in the so called driver.