On Thu, May 16, 2019 at 05:26:15PM -0700, Andy Lutomirski wrote: > Is userspace actually requred to mmap() the enclave prior to EADDing things? Nope, not since v20. Here is what I wrote about API to the kernel documentation: "The enclave life-cycle starts by opening `/dev/sgx/enclave`. After this there is already a data structure inside kernel tracking the enclave that is initially uncreated. After this a set of ioctl's can be used to create, populate and initialize the enclave. You can close (if you want) the fd after you've mmap()'d. As long as the file is open the enclave stays alive so you might want to do that after you don't need it anymore. Even munmap() won't destruct the enclave if the file is open. Neither will closing the fd as long as you have mmap() done over the fd (even if it does not across the range defined in SECS)." Enclave can be created and initialized without doing a single mmap() call. /Jarkko
