PSL_VM
tf->tf_rflags &= ~(PSL_T|PSL_D|PSL_VM|PSL_AC);
{ PSL_VM, "VM ", "vm "},
#define PSL_USERSTATIC (PSL_MBO | PSL_MBZ | PSL_I | PSL_IOPL | PSL_NT | PSL_VM | PSL_VIF | PSL_VIP)
tf->tf_eflags &= ~(PSL_T|PSL_D|PSL_VM|PSL_AC);
#define PSL_USERSTATIC (PSL_MBO | PSL_MBZ | PSL_I | PSL_IOPL | PSL_NT | PSL_VM | PSL_VIF | PSL_VIP)