The most uncertain of these latencies is the cost of entering hyp mode,
estimated at 50 cycles. This may look incredibly optimistic to those used
to x86, where VM exits are more than an order of magnitude more expensive.
Remember that ARM is a RISC architecture; kernel entry/exit
costs of the order of ten cycles, compared to many hundreds on x86.
Also, the ISA avoids inherently-expensive operations, such as automatic
saving of guest state (see Section 3.3).