Re: [Qemu-devel] [qemu-s390x] [PATCH v4 09/10] s390-ccw: read user input for boot index via the SCLP console

[David Hildenbrand <david@redhat.com>]

On 23.01.2018 19:26, Collin L. Walling wrote:
> Implements an sclp_read function to capture input from the
> console and a wrapper function that handles parsing certain
> characters and adding input to a buffer. The input is checked
> for any erroneous values and is handled appropriately.
> 
> A prompt will persist until input is entered or the timeout
> expires (if one was set). Example:
> 
>     Please choose (default will boot in 10 seconds):
> 
> Correct input will boot the respective boot index. If the
> user's input is empty, 0, or if the timeout expires, then
> the default zipl entry will be chosen. If the input is
> within the range of available boot entries, then the
> selection will be booted. Any erroneous input will cancel
> the timeout and re-prompt the user.
> 
> Signed-off-by: Collin L. Walling <walling@linux.vnet.ibm.com>
> ---

Also, a very nasty thing to take care of is the following:

SCLP and ckc interrupt at the same time pending.

-> We only dequeue one, the other remains pending and is presented to
the guest

-- 

Thanks,

David / dhildenb