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

Vol. 2B 5-29
VMX INSTRUCTION REFERENCE
#SS(0) If the memory source operand effective address is outside the
SS segment limit.
If the SS register contains an unusable segment.
#UD If operand is a register.
If executed with CR4.VMXE = 0.
Real-Address Mode Exceptions
#UD The VMXON instruction is not recognized in real-address mode.
Virtual-8086 Mode Exceptions
#UD The VMXON instruction is not recognized in virtual-8086 mode.
Compatibility Mode Exceptions
#UD The VMXON instruction is not recognized in compatibility mode.
64-Bit Mode Exceptions
#GP(0) If executed outside VMX operation with CPL > 0 or with invalid
CR0 or CR4 fixed bits.
If executed in A20M mode.
If the source operand is in the CS, DS, ES, FS, or GS segments
and the memory address is in a non-canonical form.
#PF(fault-code) If a page fault occurs in accessing the memory source operand.
#SS(0) If the source operand is in the SS segment and the memory
address is in a non-canonical form.
#UD If operand is a register.
If executed with CR4.VMXE = 0.