linux-kernel - Re: [PATCH v28 11/22] x86/sgx: Linux Enclave Driver

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Message-ID: <20200306185804.GE7472@linux.intel.com>
Date:   Fri, 6 Mar 2020 20:58:04 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-sgx@...r.kernel.org, akpm@...ux-foundation.org,
        dave.hansen@...el.com, nhorman@...hat.com, npmccallum@...hat.com,
        haitao.huang@...el.com, andriy.shevchenko@...ux.intel.com,
        tglx@...utronix.de, kai.svahn@...el.com, bp@...en8.de,
        josh@...htriplett.org, luto@...nel.org, kai.huang@...el.com,
        rientjes@...gle.com, cedric.xing@...el.com, puiterwijk@...hat.com,
        linux-security-module@...r.kernel.org,
        Suresh Siddha <suresh.b.siddha@...el.com>,
        Haitao Huang <haitao.huang@...ux.intel.com>,
        Jethro Beekman <jethro@...tanix.com>,
        Chunyang Hui <sanqian.hcy@...fin.com>
Subject: Re: [PATCH v28 11/22] x86/sgx: Linux Enclave Driver

On Thu, Mar 05, 2020 at 09:40:15AM -0800, Sean Christopherson wrote:
> Would it make sense to add reserved fields to the structs so that new
> features can be added in a backwards compatible way?  E.g. if we want to
> allow userspace to control the backing store by passing in a file
> descriptor ENCLAVE_CREATE.

It would not really be a huge win even if you did that since old
software would not be aware of the new fields. Sounds somewhat
messy to me.

Even a new ioctl later on is in my opinion always a better option
than reserved fields when you add ioctl's.

/Jarkko