Re: PROBLEM: Probabilistic segfault on AMD hardware with INVLPGB

[Andrew Cooper]

> Thanks for the quick response!
>> Upgrading the firmware on the host solved those segfaults for us.
> Our hardware is currently on microcode version 0x0B002162, while the
> advisory you linked names 0x0B00211E as the patched version for our
> model. So I think we should already be sufficiently up to date for this
> patch, but I don't know (and couldn't find anything on the web) about
> the details of AMD microcode versioning.

AMD microcode version is the bottom byte.  The higher bytes are actually
Family/Model/Stepping on all recent CPUs.

So, as for your CPU, the 0xb0021xx part means Turin (non-dense) C1
stepping, and revision 0x62 is the latest available in linux-firmware.

Either way, you're fixed to AMD-SB-3029

~Andrew