Especially some of the later patches are only loosely coupled to that
XSA, but they all needed to be withheld because of it.
1: CMPXCHG{8,16}B ignore prefixes
2: reduce CMPXCHG{8,16}B footprint
3: check for CMPXCHG8B availability
4: check for CLFLUSH{,OPT} availability
5: check for LAHF_LM availability
6: MOVNTI does not allow REP prefixes
Signed-off-by: Jan Beulich <jbeul...@suse.com>
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