b71de70 conf: introduce 'msrs' feature

Authored and Committed by Roman Bogorodskiy 5 years ago
    conf: introduce 'msrs' feature
    
    Introduce the 'msrs' feature element that controls Model Specific
    Registers related behaviour. At this moment it allows only
    single tunable attribute "unknown":
    
     <msrs unknown='ignore|fault'/>
    
    Which tells hypervisor to ignore accesses to unimplemented
    Model Specific Registers. The only user of that for now is going
    to be the bhyve driver.
    
    Signed-off-by: Roman Bogorodskiy <bogorodskiy@gmail.com>
    Reviewed-by: Cole Robinson <crobinso@redhat.com>
    
        
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