This topic is new for Visual Studio 2005 SP1.
Reads a specified field from the current virtual machine control structure (VMCS) and places it in the specified location.
The __vmx_vmread function is equivalent to the VMREAD machine instruction. The value of the Field parameter is an encoded field index that is described in Intel documentation. 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, then consult Appendix C of that document.