Hi @Zaro,
The first step would be to have SGX support in Xen. A quick grep in the source (both 4.14 and upstream master) shows it’s knows when SGX is enqbled but does not seem to do much with the info. Intel’s own SGX page points to a defunct github repo. Their patches live on at Commits · bitman694/xen-sgx · GitHub and other forks, e.g. Branches · CupertinoDude/xen-sgx · GitHub, and definitely do not appear in the Xen history.
So until someone revives the effort, the answer seems to be “no”.