VIES_PENDING_MMIO
vie->status |= VIES_PENDING_MMIO;
vie->status |= VIES_PENDING_MMIO;
VIES_PENDING_MMIO | VIES_PENDING_INOUT | VIES_USER_FALLBACK;
(vie->status & VIES_PENDING_MMIO) == 0) {
vie->status &= ~VIES_PENDING_MMIO;