[Bug 1799684] Re: [19.10 FEAT] I/O device pre-configuration - installer part

[Frank Heimes]

** Tags added: installer

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Title:
  [19.10 FEAT] I/O device pre-configuration - installer part

Status in subiquity:
  Fix Released
Status in Ubuntu on IBM z Systems:
  Fix Committed
Status in debian-installer package in Ubuntu:
  Triaged

Bug description:
  Installer enhancement for following functionality .

  I/O device auto-configuration is a mechanism by which users can
  specify IDs and settings of I/O devices that should be automatically
  enabled in Linux. Users enter this information for an LPAR via an HMC
  running in DPM mode. During boot, Linux obtains this information via
  an SCLP call (details to be defined) and triggers the resulting
  configuration actions (e.g.

  LPARs that are running in IBM Dynamic Partition Manager (DPM) mode can access a firmware-generated I/O configuration data file that contains s390-specific information about available I/O devices such as qeth device numbers and parameters, and FCP device IDs.
      
  This data file is intended to remove the need for users to manually enter the corresponding device data during installation.
      
  Linux kernels with the corresponding support make the I/O configuration data available at the following location:
      
                     /sys/firmware/sclp_sd/config/data

  The format of this file is understood by chzdev's --import function.

  Canonical needs to extend their Ubuntu installer to
  a) check if the above mentioned sysfs file contains data (read returns data, cannot check file size as that is alway 0)
  b) provide an option for users to apply this configuration data to the installer system (using chzdev --import)
  c) ensure that the installer is aware of the resulting Linux devices (SCSI LUNs, networking devices, etc.) for use in the installation workflow
  d) provide an option for users to deactivate auto-configuration for the installed system (if selected, this should add "rd.zdev=no-auto" to the kernel command line). If this is not done, the installed system will automatically activate the devices specified in the I/O configuration data file, which may result in problems e.g. when SCSI LUN scanning results in an excessive amount of unwanted SCSI LUNs

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