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> AMD have released an microcode update for affected processors.

I don't think that is correct. AMD has released a microcode update[0] for family 17h models 0x31 and 0xa0, which corresponds to Rome, Castle Peak and Mendocino as per WikiChip [1].

So far, there seems to be no microcode update for Renoir, Grey Hawk, Lucienne, Matisse and Van Gogh. Fortunately, the newly released kernels can and do simply set the chicken bit for those. [2]

[0] https://git.kernel.org/pub/scm/linux/kernel/git/firmware/lin...

[1] https://en.wikichip.org/wiki/amd/cpuid#Family_23_.2817h.29

[2] https://github.com/torvalds/linux/commit/522b1d69219d8f08317...



More details:

`good_revs` as per the kernel: https://github.com/torvalds/linux/commit/522b1d69219d8f08317...

Currently published revs ("Patch") (git HEAD):

https://git.kernel.org/pub/scm/linux/kernel/git/firmware/lin...

As of this writing, only two of the five `good_rev`s have been published.


What does that chicken bit do?


https://www.phoronix.com/news/Linux-AMD-Spectral-Chicken


and Mendocino

That's the same codename Intel used for Celerons 24 years ago, the ones famous for 50% overclocks:

https://ark.intel.com/content/www/us/en/ark/products/codenam...




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