CR4_VMXE
cr4 = vrs->vrs_crs[VCPU_REGS_CR4] | CR4_VMXE;
if (vmwrite(VMCS_CR4_MASK, CR4_VMXE)) {
r |= CR4_VMXE;
cr4 |= CR4_VMXE;
cr4 &= ~CR4_VMXE;
{ CR4_VMXE, "VMXE ", "vmxe "},