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Fix IBRS handling around MWAIT.

Description

Fix IBRS handling around MWAIT.

The intent was to disable IBPB and IBRS around MWAIT, and re-enable on
the sleep end.

Reviewed by: emaste
Sponsored by: The FreeBSD Foundation
MFC after: 3 days

Details

Provenance
kibAuthored on
Reviewer
emaste
Parents
rS333890: Enable kernel dump features in GENERIC for most platforms.
Branches
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Tags
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