Intel 64 and IA-32 Architectures Software Developers Manual Volume 2B, Instruction Set Reference, N-Z

5-26 Vol. 2B
VMX INSTRUCTION REFERENCE
Address size Ignored
REX Ignored
Protected Mode Exceptions
#GP(0) If executed in VMX root operation with CPL > 0.
#UD If executed outside VMX operation.
Real-Address Mode Exceptions
#UD A logical processor cannot be in real-address mode while in VMX
operation and the VMXOFF instruction is not recognized outside
VMX operation.
Virtual-8086 Mode Exceptions
#UD The VMXOFF instruction is not recognized in virtual-8086 mode.
Compatibility Mode Exceptions
#UD The VMXOFF instruction is not recognized in compatibility mode.
64-Bit Mode Exceptions
#GP(0) If executed in VMX root operation with CPL > 0.
#UD If executed outside VMX operation.