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?
Regards,
Anthony Liguori
Alex
