SIR_XENIPL_HIGH
KASSERT(sir <= SIR_XENIPL_HIGH);
KASSERT(sir >= SIR_XENIPL_VM && sir <= SIR_XENIPL_HIGH);
KASSERT(sir >= SIR_XENIPL_VM && sir <= SIR_XENIPL_HIGH);
atomic_or_64(&xenevt_ih->ih_cpu->ci_istate, (1ULL << SIR_XENIPL_HIGH));