linux-kernel - Re: [RFC PATCH v2 4/4] x86/vdso: Add __vdso_sgx_enter_enclave() to wrap SGX enclave transitions

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Message-ID: <f036e41f-8b93-cab3-07fd-641354e60b35@fortanix.com>
Date:   Fri, 7 Dec 2018 18:19:03 +0000
From:   Jethro Beekman <jethro@...tanix.com>
To:     "Dr. Greg" <greg@...ellic.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>
CC:     Andy Lutomirski <luto@...nel.org>,
        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>,
        Andy Lutomirski <luto@...capital.net>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Josh Triplett <josh@...htriplett.org>,
        Haitao Huang <haitao.huang@...ux.intel.com>,
        "linux-sgx@...r.kernel.org" <linux-sgx@...r.kernel.org>
Subject: Re: [RFC PATCH v2 4/4] x86/vdso: Add __vdso_sgx_enter_enclave() to
 wrap SGX enclave transitions

On 2018-12-07 22:01, Dr. Greg wrote:
> Baidu and Fortanix are working on Trusted RunTime Systems (TRTS) based
> on RUST, I believe, so this will affect them to the extent that they
> are implementing their own low level enclave runtime support or they
> may be simply building on top of the low level Intel TRTS.  Perhaps
> Jethro would comment on these issues if he could.

As far as I know, Baidu merely provides Rust bindings to the Intel SDK. 
As far as our requirements, I've sent those in my previous email.

> I'm assuming that in the proposed model the URTS would interrogate the
> VDSO to determine the availability of entry and exception handling
> support and then setup the appropriate infrastructure and exit
> handler?  VDSO's are typically the domain of the system library.
> Given the nature of SGX I couldn't even conceive of Glibc offering
> support and, if it was acceptable to provide support, the potential
> timeframe that would be involved in seeing deployment in the field.
> 
> As a result, do you anticipate the need for a 'flag day' with respect
> to URTS/PSW/SDK support for all of this?

It is my understanding that the use of the vDSO enclave entry will be 
optional. i.e., if your application/library/enclave combination installs 
a signal handler and calls ENCLU directly, that would still work. Of 
course, using the vDSO will be very strongly recommended.

--
Jethro Beekman | Fortanix


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