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A comment on AMD ships microcode update to disable some branch prediction. Parent comment

Re:AMD ships microcode update to disable some branch prediction by revelation on Friday January 05, 2018 @04:34PM (#16081889)
They are doing the same as the Intel microcode update presumably, offering kernel a bit to enable/disable indirect branch speculation. Usually it will be disabled on entry into kernel and reenabled on exit, so it helps the kernel, not necessary user programs spying on each other (retpoline for those)

See here:

https://lkml.org/lkml/2018/1/4/615

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Re:AMD ships microcode update to disable some branch prediction by caf on Friday January 05, 2018 @10:25PM (#16083667)
The IBPB mitigation clears indirect branch prediction state on context switches between processes so it does help with processes spying on each other.
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