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

5-28 Vol. 2B

VMX INSTRUCTION REFERENCE

ELSE

current-VMCS pointer ← FFFFFFFF_FFFFFFFFH;

enter VMX operation;

block INIT signals;

block and disable A20M;

clear address-range monitoring;

VMsucceed;

FI;

ELSIF in VMX non-root operation

THEN VMexit;

ELSIF CPL > 0

THEN #GP(0);

ELSE VMfail(“VMXON executed in VMX root operation”);

FI;

Flags Affected

See the operation section and Section 5.2.

Use of Prefixes

LOCK Causes #UD

REP* Ignored (includes REPNE/REPNZ and REP/REPE/REPZ)

Segment overrides Treated normally

Operand size Ignored

Address size Treated normally

REX Register extensions treated normally; operand-size overrides

ignored

Protected 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 memory source 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 source operand is located in an execute-only code

segment.

#PF(fault-code) If a page fault occurs in accessing the memory source operand.