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L1TLB: VS-mode SFENCE misses tera/giga-page entries fragmented superpages (backport #3297) #3300

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merged 1 commit into from
Mar 14, 2023
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L1TLB: VS-mode SFENCE misses tera/giga-page entries fragmented superpages (backport #3297) #3300

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13 changes: 6 additions & 7 deletions src/main/scala/rocket/TLB.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -219,13 +219,12 @@ class TLBEntry(val nSectors: Int, val superpage: Boolean, val superpageOnly: Boo
for (((v, e), i) <- (valid zip entry_data).zipWithIndex)
when (tag_v === virtual && i.U === sectorIdx(vpn)) { v := false.B }
}

// For fragmented superpage mappings, we assume the worst (largest)
// case, and zap entries whose most-significant VPNs match
when (((tag_vpn ^ vpn) >> (pgLevelBits * (pgLevels - 1))) === 0.U) {
for ((v, e) <- valid zip entry_data)
when (tag_v === virtual && e.fragmented_superpage) { v := false.B }
}
}
// For fragmented superpage mappings, we assume the worst (largest)
// case, and zap entries whose most-significant VPNs match
when (((tag_vpn ^ vpn) >> (pgLevelBits * (pgLevels - 1))) === 0.U) {
for ((v, e) <- valid zip entry_data)
when (tag_v === virtual && e.fragmented_superpage) { v := false.B }
}
}
def invalidateNonGlobal(virtual: Bool): Unit = {
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