30-18 Vol. 3C

VMX INSTRUCTION REFERENCE

VMPTRST—Store Pointer to Virtual-Machine Control Structure

Description

Stores the current-VMCS pointer into a specified memory address. The operand of this instruction is always 64 bits 
and is always in memory.

Operation

IF (register operand) or (not in VMX operation) or (CR0.PE = 0) or (RFLAGS.VM = 1) or (IA32_EFER.LMA = 1 and CS.L = 0)

THEN #UD;

ELSIF in VMX non-root operation

THEN VMexit;

ELSIF CPL

>

 0

THEN #GP(0);
ELSE 

64-bit in-memory destination operand ← current-VMCS pointer;

VMsucceed;

FI;

Flags Affected

See the operation section and Section 30.2.

Protected Mode Exceptions

#GP(0)

If the current privilege level is not 0.
If the memory destination operand effective address is outside the CS, DS, ES, FS, or GS 

segment limit.

If the DS, ES, FS, or GS register contains an unusable segment.
If the destination operand is located in a read-only data segment or any code segment.

#PF(fault-code)

If a page fault occurs in accessing the memory destination operand.

#SS(0)

If the memory destination operand effective address is outside the SS segment limit.
If the SS register contains an unusable segment.

#UD

If operand is a register.
If not in VMX operation.

Real-Address Mode Exceptions

#UD

If executed outside VMX root operation.

Virtual-8086 Mode Exceptions

#UD

The VMPTRST instruction is not recognized in virtual-8086 mode.

Compatibility Mode Exceptions

#UD

The VMPTRST instruction is not recognized in compatibility mode.

Opcode

Instruction

Description

0F C7 /7

VMPTRST m64

Stores the current VMCS pointer into memory.