The buried lede in NEMESIS and FORESHADOW:<div><br></div><div>For the “case of a fault or external interrupt, the processor executes an Asynchronous Enclave Exit (AEX) procedure that saves the execution context securely in a preallocated state save area inside the enclave, and replaces the CPU registers with a synthetic state to avoid di- rect information leakage to the untrusted ISR.”</div><div><br></div><div>Seems. Odd.</div><div><br></div><div>I dunno. Did anyone read x86 documentation?</div>