Re: RISC-V Vector Extension post-public review updates
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The primary reason was lack of encoding space for non-unit-stride fault-on-first instructions.
The security concern was being able to probe addresses to find accessible regions without free of being killed on touching a prohibited region. It was noted that this is still present even for unit-stride in supervisor mode when using translation to arbitrarily probe supervisor physical space. However, I believe these security concerns are manageable through control mechanisms at higher privilege levels.