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Add x86 msr tweak KPI.

Description

Add x86 msr tweak KPI.

Use the KPI to tweak MSRs in mitigation code.

Reviewed by: markj, scottl
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D22431

Details

Provenance
kibAuthored on
Reviewer
markj
Differential Revision
D22431: Add x86 msr tweak KPI.
Parents
rS354827: Check for errors from copyout() and suword*() in sv_copyout_args/strings.
Branches
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