On 05/19/2017 07:34 PM, Daniel P. Berrange wrote:
On Fri, May 19, 2017 at 12:56:44PM -0400, Farhan Ali wrote:
This patch series introduces the support for new s390x 'loadparm' feature. The 'loadparm' can be used to select the boot entry to boot from, for a boot device.
Why do we need / want any of this when we already have bootindex=NN support. Inventing a S390-only way to select the boot device order is pretty horrible IMHO
loadparm is an 8 byte character parameter for s390 systems and available on all other hypervisors (LPAR/z/VM). It is really a part of the architecture. Linux does use it to select a boot entry within a disk, but for other guest operating systems it is used to pass along other kind of parameters for the ipl process, e.g. check https://www.ibm.com/support/knowledgecenter/zosbasics/com.ibm.zos.zsysprog/z... to see what z/OS uses. Not having it was really a missing part of the s390 support.