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INSTRUCTION SET REFERENCE
WRMSRWrite to Model Specific Register (Continued)
Protected Mode Exceptions
#GP(0)
If the current privilege level is not 0.
If the value in ECX specifies a reserved or unimplemented MSR address.
Real-Address Mode Exceptions
#GP
If the value in ECX specifies a reserved or unimplemented MSR address.
Virtual-8086 Mode Exceptions
#GP(0)
The WRMSR instruction is not recognized in virtual-8086 mode.
