Re: proposal for stateen CSRs

Bill Huffman



From: Scott Johnson <scott.johnson@...>
Sent: Tuesday, April 20, 2021 8:33 PM
To: Bill Huffman <huffman@...>
Cc: tech-privileged@...
Subject: Re: [RISC-V] [tech-privileged] proposal for stateen CSRs



It seems the use model is to enable older environment-swapping software to run on newer hardware without opening a security hole via new state. Only if the software is aware of the state will it enable that state via *stateen.


For custom state, you can always make custom *stateen-like CSRs to enable it. You're going to need custom software to swap that state anyway.


True.  I was thinking of unifying the two purposes when I asked the question.




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