func (model *Model) Handle(
vm *platform.Vm,
cache *IoCache,
handler *IoHandler,
ioevent IoEvent,
addr platform.Paddr) error {
if handler != nil {
// Our offset from handler start.
offset := addr.OffsetFrom(handler.start)
// Submit our function.
err := handler.queue.Submit(ioevent, offset)
// Should we save this request?
if ioevent.IsWrite() && err == SaveIO {
err = cache.save(
vm,
addr,
handler,
ioevent,
offset)
}
// Return to our vcpu.
return err
} else if !ioevent.IsWrite() {
// Invalid reads return all 1's.
switch ioevent.Size() {
case 1:
ioevent.SetData(0xff)
case 2:
ioevent.SetData(0xffff)
case 4:
ioevent.SetData(0xffffffff)
case 8:
ioevent.SetData(0xffffffffffffffff)
}
}
return nil
}
