On 24.11.2009, at 20:30, Anthony Liguori wrote: > Alexander Graf wrote: >> On 24.11.2009, at 20:25, Anthony Liguori wrote: >> >> >>> Alexander Graf wrote: >>> >>>> On 24.11.2009, at 19:55, Anthony Liguori wrote: >>>> >>>> >>>>> Alexander Graf wrote: >>>>> >>>>>> On our S390x Virtio machine we don't have anywhere to display early >>>>>> printks >>>>>> on, because we don't know about VGA or serial ports. >>>>>> >>>>>> So instead we just forward everything to the virtio console that we >>>>>> created >>>>>> anyways. >>>>>> >>>>> What is this used for? >>>>> >>>> This is used for console output before virtio is initialized. I didn't >>>> invent it - that's the way it's implemented in the s390 kernels today. >>>> >>> I don't see any code that calls this function. Am I missing something >>> obvious? >>> >> >> It gets called from target-s390x/kvm.c using a special hypercall instruction. >> > > Oh, that's bad :-) > > That should really be it's own character device. We don't really have a way > to connect two character devices like that. > Maybe muxing?
So you want me to implement char muxing and a bootloader within a week? :) Alex
