Enable support for enclave-based time tracking by default #661
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SGXv2 platforms support calling the rdtscp instruction inside an enclave. PRs #659 and #660 added support to take advantage of this change and enable enclave to keep track of time without doing a usercall. This PR changes the default behavior on platforms that have SGXv2 support. This is a bit tricky as existing enclaves were not compiled with this in mind. When they do receive additional information from the enclave-runner that they don't expect, they will panic. This is addressed by printing a detailed error message with possible solutions.
As this code only makes sense for enclaves that were compiled with
rdtscpsupport in mind, this should be merged at the same time support lands in the Rust compiler.