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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
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