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From:   Sean Christopherson <sean.j.christopherson@intel.com>
To:     Jethro Beekman <jethro@fortanix.com>
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Subject: Re: RFC: userspace exception fixups
Message-ID: <20181102165204.GC7393@linux.intel.com>
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On Fri, Nov 02, 2018 at 04:37:10PM +0000, Jethro Beekman wrote:
> On 2018-11-02 09:30, Sean Christopherson wrote:
> >... The intended convention for EENTER is to have an ENCLU at the AEX target ...
> >
> >... to further enforce that the AEX target needs to be ENCLU.
> 
> Some SGX runtimes may want to use a different AEX target.

To what end?  Userspace gets no indication as to why the AEX occurred.
And if exceptions are getting transfered to userspace the trampoline
would effectively be handling only INTR, NMI, #MC and EPC #PF.