Still a nice hack.

[1] https://pesin.space/posts/2020-09-22-latencies/

To the host, it’d be already mapped as a BAR.

Think of it: industry cottons onto this idea, sets up entire server farms to make memory more efficient at lower cost, and then starts mining what is in memory for profit. The process accelerates and intensifies the memory shortage, snowballing the industry move.

Finally, the government steps in because it makes it so much easier to monitor “dissidents”, and mandates into law that all systems have to run with cloud memory, thereby putting anyone who is online under 24/7 surveillance. Because memory for every system has been abstracted out into server farms, it is beyond the control of users and no-one is safe anymore.

Right now the government has to employ non-trivial efforts to monitor an educated and even moderately-skilled person. This will reduce that effort to zero.

This is an immensely dangerous proposition wrapped up in an innocent solution.