HFENCE.GVMA over-invalidates TLB V=0 entries #2954
Merged
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Related issue:
Type of change: other enhancement
Impact: no functional change
Development Phase: implementation
Release Notes
HFENCE.GVMA
sfence.bits.hg=1, hv=0
should target all and only TLB entries with V=1, not V=0.It is functionally safe to over-invalidate TLB entries, so not marking this as a “Bug” per se, but it was not the design intent.