On my Zen2 / Renoir based system the PoC exploit continues to work albeit slowly even after updating the microcode (linked from TFA) that has the fix for this issue. The wrmsr stops it fully in its track.
Edit: just realized it must have been that the initramfs image is not updated with the manually updated firmware in /lib/firmware.
Edit2: Updated the initramfs and even if the benchmark.sh fails, ./zenbleed -v2 still picks out and prints strings which doesn't happen with the wrmsr solution.
Edit: just realized it must have been that the initramfs image is not updated with the manually updated firmware in /lib/firmware.
Edit2: Updated the initramfs and even if the benchmark.sh fails, ./zenbleed -v2 still picks out and prints strings which doesn't happen with the wrmsr solution.