Re: [Qemu-devel] s390 - Parts of console output lost

[Amit Shah]

On (Mon) Apr 05 2010 [16:45:21], Bastian Blank wrote:
> Hi
> 
> 116348def2bb446d972bdc2f44bd77ff631f85de works on s390/kvm, but on startup
> parts of the console output is lost. The used kernel is a standard Debian
> distribution kernel.
> 
> | $ ./s390x-softmmu/qemu-system-s390x -nographic -enable-kvm -kernel 
> /boot/vmlinuz-2.6.32-4-s390x -initrd /boot/initrd.img-2.6.32-4-s390x -append 
> "break=premount"
> | [    0.583078] cio: Channel measurement facility initialized using format 
> basic (mode autodetected)
> | [    0.585475] TCP cubic registered
> 
> Everything up to the first line is lost on the virtio console. This
> could be also a kernel problem as this kernel includes two drivers
> responsible for hvc, virtio and iucv. The last line in the kernel log
> before the properly shown ones is:
> 
> | [    0.592667] hvc_iucv: The z/VM IUCV HVC device driver cannot be used 
> without z/VM

The kernel should be using the virtio_console functionality. Do you have
it compiled in to get early_printks?

                Amit