Re: [PATCH v29 00/20] Intel SGX foundations

[Jordan Hand]

On 5/7/20 11:06 AM, Dr. Greg wrote:
> On Wed, May 06, 2020 at 09:39:55AM -0700, Jordan Hand wrote:
>
> Good afternoon, I hope the week is going well for everyone.
>
> > On 4/21/20 2:52 PM, Jarkko Sakkinen wrote:
> > > Make the vDSO callable directly from C by preserving RBX and taking leaf
> > >    from RCX.
>
> > Tested with the Open Enclave SDK on top of Intel PSW. Specifically built
> > the Intel PSW with changes to support /dev/sgx mapping[1] new in v29.
> >
> > Tested-by: Jordan Hand <jorhand@xxxxxxxxxxxxxxxxxxx>
> >
> > [1] https://github.com/intel/linux-sgx/pull/530
>
> Did you re-wire your SDK to convert all your ECALL and exception
> handling to the new VDSO architecture?
>

No. We have many users of our SDK who rely on the out-of-tree driver and 
will for the foreseeable future. I aim to support both in-tree and 
out-of-tree with minimal code diff.

> Failures in enclave loading and initialization demonstrate themselves
> pretty clearly and are in the domain of the PSW being used.  If there
> are going to be subtle SGX application operability issues that need to
> be found they will be in the new ECALL and exception handling
> mechanisms.

Fair enough, no I have not tested those mechanisms. Apologies, I should 
have removed that line from the quoted text.

-Jordan