linux-kernel - Re: x86/sgx: uapi change proposal

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Message-ID: <20181220103204.GB26410@linux.intel.com>
Date:   Thu, 20 Dec 2018 12:32:04 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Jethro Beekman <jethro@...tanix.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "x86@...nel.org" <x86@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-sgx@...r.kernel.org" <linux-sgx@...r.kernel.org>,
        Josh Triplett <josh@...htriplett.org>,
        Haitao Huang <haitao.huang@...ux.intel.com>,
        "Dr . Greg Wettstein" <greg@...ellic.com>
Subject: Re: x86/sgx: uapi change proposal

On Wed, Dec 19, 2018 at 06:58:48PM -0800, Andy Lutomirski wrote:
> Can one of you explain why SGX_ENCLAVE_CREATE is better than just
> opening a new instance of /dev/sgx for each encalve?

I think that fits better to the SCM_RIGHTS scenario i.e. you could send
the enclav to a process that does not have necessarily have rights to
/dev/sgx. Gives more robust environment to configure SGX.

/Jarkko