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OpenXiangShan / XiangShan

Open-source high-performance RISC-V processor
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MMU: LLPTW should report PF when pte is not leaf #3059

Closed good-circle closed 2 weeks ago

good-circle commented 2 weeks ago

When LLPTW looks for the last level of the page table (a 4KB page table), it must be a leaf node. The condition that the x w r bits of the page table cannot all be 0 needs to be satisfied. When this condition is not met, the LLPTW needs to report pf to the L1 TLB. (Although in practice the L1 TLB does a permission check as well, which does not result in an error from the MMU's overall perspective)

XiangShanRobot commented 2 weeks ago
[Generated by IPC robot] commit: 535ebc5904331be5847190f0156240eaf2122f70 commit astar copy_and_run coremark gcc gromacs lbm linux mcf microbench milc namd povray wrf xalancbmk
535ebc5 1.808 0.447 2.043 1.187 2.938 2.508 2.291 0.921 1.369 1.441 3.454 2.658 2.399 2.932
master branch: commit astar copy_and_run coremark gcc gromacs lbm linux mcf microbench milc namd povray wrf xalancbmk
e975de6 1.808 0.447 2.043 1.187 2.938 2.508 2.291 0.921 1.369 1.441 3.454 2.658 2.399 2.932
ff9b84b 0.447 2.043 1.187 2.291 0.921 1.369 3.454 2.658 2.932
3bec463 1.808 0.447 2.043 1.187 2.938 2.508 2.291 0.921 1.369 1.441 3.454 2.658 2.399 2.932
2d12882 0.447 2.043 1.187 2.291 0.921 1.369 3.454 2.658 2.932
ef14270 1.827 0.448 2.048 1.190 2.938 2.508 2.289 0.932 1.369 1.410 3.445 2.672 2.398 2.932
5c5f442 1.827 0.448 2.048 1.190 2.938 2.508 2.289 0.932 1.369 1.410 3.445 2.672 2.398 2.932
d67c873 1.827 0.448 2.048 1.190 2.938 2.508 2.289 0.932 1.369 1.410 3.445 2.672 2.398 2.932
00f9d18 1.809 0.448 2.060 1.191 2.938 2.508 2.290 0.932 1.419 1.338 3.431 2.642 2.398 2.932
3b94d5d 1.809 0.448 2.060 1.191 2.938 2.508 2.290 0.932 1.419 1.338 3.431 2.660 2.398 2.932
2f6c010 1.820 0.448 2.060 1.199 2.938 2.508 2.290 0.932 1.419 1.338 3.427 2.651 2.398 2.932