Stores the pointer to the current virtual-machine control structure (VMCS) at the specified address.
The VMCS pointer is a 64-bit physical address.
The __vmx_vmptrst function is equivalent to the VMPTRST machine instruction. This function supports the interaction of a host's virtual machine monitor with a guest operating system and its applications. For more information, search for the document, "Intel Virtualization Technical Specification for the IA-32 Intel Architecture," document number C97063-002, at the Intel Corporation site.