PSA: If you want Spectre v2 mitications (IBPB) on Ryzen/Threadripper and haven't or can't update your BIOS, here's an updated /lib/firmware/amd-ucode/microcode_amd_fam17h.bin: https://mrcn.st/t/microcode_amd_fam17h.bin …. AMD doesn't care about desktop Linux users, only EPYC, apparently.
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Before: microcode: CPU0: patch_level=0x08001129 spectre_v2:Mitigation: Full AMD retpoline After: microcode: microcode updated early to new patch_level=0x08001137 microcode: CPU0: patch_level=0x08001137 spectre_v2:Mitigation: Full AMD retpoline, IBPB
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