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zzrcxb / LLCFeasible

Open source release of "Last-Level Cache Side-Channel Attacks Are Feasible in the Modern Public Cloud" (ASPLOS '24)
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error about CHA #1

Closed Glutton0 closed 2 months ago

Glutton0 commented 2 months ago

Hello professor, I want to reproduce your binary search algorithm to find the eviction set, but when I use the straw algorithm on LLC, the following problem always occurs. I don't know how to solve it. And I have turned off the filter.But the process always reminds me：ERROR: Did not find device 1e.3 ERROR: Failed to retrieve CHA information, cannot initialize CHA PMON! ERROR: Failed to initialize CHA ERROR: Failed to build an L2 evset how do i do? (T . T)

zzrcxb commented 2 months ago

Hi, thanks for your interest in this project.

The CHA error is mainly a warning message that the code could not use performance counters. It should not have any impact on the results.

Meanwhile, could you provide a bit more details on your setup? For example, on which CPU you were running the code? Is the error specific to straw? Could you share the full command that you used?

Glutton0 commented 2 months ago

Hi, thanks for your interest in this project.

The CHA error is mainly a warning message that the code could not use performance counters. It should not have any impact on the results.

Meanwhile, could you provide a bit more details on your setup? For example, on which CPU you were running the code? Is the error specific to straw? Could you share the full command that you used?

Thank you for taking the time to answer my questions. I am using an intel i5-7300hq processor and its architecture is kaby lake. After I enabled vmware's virtual performance counter, CHA-related issues no longer popped up. However, the problem "ERROR: Failed to build an L2 evset" will exist no matter which algorithm is used when using the command "./osc-single-evset LLC -A xxx -f". Even if I increase the values ​​of "--max-tries" and "--max-backtrack", it can only reduce the number of occurrences of "ERROR: Failed to build an L2 evset". straw、

zzrcxb commented 2 months ago

Thanks for the additional information! This code is mostly implemented for Intel server-class CPUs since Skylake-SP. I'm afraid it probably won't work out-of-the-box for Intel i5-7300hq due to differences in cache hierarchy.

Glutton0 commented 2 months ago

Thanks for the additional information! This code is mostly implemented for Intel server-class CPUs since Skylake-SP. I'm afraid it probably won't work out-of-the-box for Intel i5-7300hq due to differences in cache hierarchy.

I should have thought of this, thank you for your enthusiastic answer！

zzrcxb commented 2 months ago

Hi, if there are no further questions, do you mind if I close this issue?