On 10/30/2012 01:59 PM, Cornelia Huck wrote:
On Mon, 29 Oct 2012 19:14:19 +0100
Alexander Graf<agraf@xxxxxxx> wrote:
On 29.10.2012, at 14:07, Cornelia Huck wrote:
This code is transport agnostic and can be used by both the legacy
virtio code and virtio_ccw.
Would it be possible to actually send real virtio or sclp console commands for early printk? That'd make things a lot easier on the user space end. Combining two completely separate character channels (early printk + sclp or early printk + virtio-console) is really tricky.
This code is only used if we use a virtio console device. The sclp
code path is completely different.
Ah, so the sclp early console works differently?
What do you mean with "real virtio console commands"? The message is
just put on the output queue anyway.
For virtio-console, yes. For the early printk it is sent to the
hypervisor using a hypercall, not through the virtio queue. So it
arrives at a completely different end point that usually has no
knowledge of the virtio-console output driver.
Alex
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