Re: [RFC QEMU PATCH] pc-bios/s390-ccw: Add zipl-like "BOOT_IMAGE=x" to the kernel parameters

[Christian Borntraeger]

On 16.12.19 12:24, Thomas Huth wrote:
>  Note: I've marked the patch as RFC since I'm not quite sure whether
>  this is really the right way to address this issue: It's unfortunate
>  that we have to mess with different location in ZIPL which might also
>  change again in the future. As suggested by Christian on IRC last week,
>  maybe it would make more sense to change ZIPL to add this parameter
>  already when zipl is installed (i.e. by the Linux userspace "zipl" pro-
>  gram), instead of adding it during boot time? Also, the BOOT_IMAGE para-
>  meter on s390x is quite different from the BOOT_IMAGE paramter that is
>  used on x86 - while s390x only uses one single number here, the x86
>  variant (added by grub2, I guess) uses the boot device + full filename
>  of the kernel on the boot partition. Should we maybe make the s390x
>  variant more conform to x86? If so, I think this really has to be fixed
>  in zipl userspace tool, and not in the s390-ccw bios (and zipl stage3
>  bootloader).

Yes, I actually think we should revisit the whole BOOT_IMAGE scheme on s390.
Maybe we should use the kernel name, or the name of the boot menu entry.
And maybe we should not use 0 (when the default is running) but instead
really use to what 0 points to.