On Fri, Aug 19, 2022 at 02:33:08AM +0200, Ben Hutchings wrote:
> From: Ben Hutchings <b...@debian.org>
> The mitigation for PBRSB includes adding LFENCE instructions to the
> RSB filling sequence.  However, RSB filling is done on some older CPUs
> that don't support the LFENCE instruction.

Wait; what? There are chips that enable the RSB mitigations and DONT
have LFENCE ?!?

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