On 2018-11-02 09:52, Sean Christopherson wrote:
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.
Various reasons...Userspace may have established an exception handling convention with the enclave (by setting TCS.NSSA > 1) and may want to call EENTER instead of ERESUME.
Userspace may want fine-grained control over enclave scheduling (e.g. SGX-Step)
-- Jethro Beekman | Fortanix
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