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SubjectRe: [PATCH] x86/speculation: Avoid LFENCE in FILL_RETURN_BUFFER on CPUs that lack it
On Fri, Aug 19, 2022 at 02:33:08AM +0200, Ben Hutchings wrote:
> From: Ben Hutchings <benh@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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