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VMCALL

Calls the VMX root operation or triggers a VM exit to the Virtual Machine Monitor (VMM).

The following table covers what the source and destinations can be.

DO NOT support LOCK

VMCALL is available only when the processor is operating in VMX non-root operation. If executed in VMX root operation, the instruction is ignored (it acts as a NOP).

To avoid unexpected behavior, the software SHALL ensure that the processor is in VMX non-root operation before invoking VMCALL to successfully transfer control to the VMM. Because VMCALL does not take operands, any attempt to specify a source or destination will result in an invalid operation.