x86/spec-ctrl: Knobs for STIBP and PSFD, and follow hardware STIBP hint

x86/spec-ctrl: Knobs for STIBP and PSFD, and follow hardware STIBP hint

STIBP and PSFD are slightly weird bits, because they're both implied by other
bits in MSR_SPEC_CTRL.  Add fine grain controls for them, and take the
implications into account when setting IBRS/SSBD.

Rearrange the IBPB text/variables/logic to keep all the MSR_SPEC_CTRL bits
together, for consistency.

However, AMD have a hardware hint CPUID bit recommending that STIBP be set
unilaterally.  This is advertised on Zen3, so follow the recommendation.
Furthermore, in such cases, set STIBP behind the guest's back for now.  This
has negligible overhead for the guest, but saves a WRMSR on vmentry.  This is
the only default change.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>