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

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Message-ID: <20181222081649.GB8895@linux.intel.com>
Date:   Sat, 22 Dec 2018 10:16:49 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Andy Lutomirski <luto@...nel.org>,
        Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     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 Thu, Dec 20, 2018 at 12:32:04PM +0200, Jarkko Sakkinen wrote:
> 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.

Sean, is this why you wanted enclave fd and anon inode and not just use
the address space of /dev/sgx? Just taking notes of all observations.
I'm not sure what your rationale was (maybe it was somewhere). This was
something I made up, and this one is wrong deduction. You can easily
get the same benefit with /dev/sgx associated fd representing the
enclave.

This all means that for v19 I'm going without enclave fd involved with
fd to /dev/sgx representing the enclave. No anon inodes will be
involved.

/Jarkko