Re: [Qemu-devel] [PATCH 10/13] Implement early printk in virtio-console

[Alexander Graf]

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.

Alex