VM66332: STAND ALONE DUMP FROM SCSI MAY FAIL ON Z15

Obtain the fix for this APAR.

APAR status

• Closed as unreproducible in next release.

Error description

• Using z/VM Stand-alone Dump from SCSI Dasd fails on a z15
  processor with wait state 4524 in the following environments:
  -  in a guest and invoked with CP IPL <fcp_vdev> DUMP and
     the guest virtual machine is defined with less than
     512 MB of virtual storage.
  -  when loaded from HMC in a first-level system and the LPAR
     is using less than 3 GB of storage.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All installations of z/VM on IBM z15 using   *
  *                 Stand-Alone Dump to SCSI Dasd.               *
  *                 Additional keywords: D/T8561                 *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  ****************************************************************
  * RECOMMENDATION: APPLY PTF                                    *
  ****************************************************************
  Using z/VM Stand-alone Dump from SCSI Dasd on a z15 processor
  fails with wait state 4524 in the following environments:
   -  in a guest and invoked with CP IPL <fcp_vdev> DUMP and
      the guest virtual machine is defined with less than
      512 MB of virtual storage.
   -  when loaded from HMC in a first-level system and the LPAR
      is using less than 3 GB of storage.
  
  Also CP virtual storage could be overlaid when a guest with
  less than 512 MB IPLs stand-alone dump from SCSI Dasd on a
  z15 processor.
  

Problem conclusion

Temporary fix

• *********
  * HIPER *
  *********
  FOR RELEASE VM/ESA CP/ESA R640 :
  PREREQ: VM66321 VM65918 VM66280
  CO-REQ: NONE
  IF-REQ: NONE
  FOR RELEASE VM/ESACP/ESAR710 :
  PREREQ: VM66321 VM66334 VM66280
  CO-REQ: NONE
  IF-REQ: NONE
  

Comments

• CP has been changed so that when running on a z15 processor, CP
  checks that the guest has enough virtual storage (512MB) to IPL
  from an FCP device with the DUMP option.  If not, a new
  variation of message HCP2815E is displayed.
  
     HCPLDI2815E The virtual storage size must be greater than
     512M to IPL from a SCSI device with the DUMP option.
  
  Also code was changed to correctly handle the dump prefix page
  so that the invalid page bits don't overlay CP virtual storage.
  These parts implement the changes described above:  HCPLDI,
  HCPMFN, HCPPCT, HCPSDT, HCPHWLBK, HCPMES and HCPMXRBK.
  
  Also, changes where made to CP and some stand-alone utility
  programs to avoid the 4524 wait state when run smaller storage
  size environments, specifically less than 3 GB when running
  first level and less than 2214 MB when running second level.
  This was accomplished by moving the crashkernel buffer starting
  address from 128 MB to 129 MB, which means that a minimum of
  257 MB of storage is necessary instead of 256 MB.  These parts
  were changed:
  
   HCPSAL - Changed so that SAPL allocates the crashkernel area
            at 129 MB or higher.
  
   HCPDDR - Changed so that stand-alone DDR allocates the
            crashkernel area at 129 MB or higher.
  
   HCPLOD - Changed so that early CP initialization allocates the
            crashkernel area at 129 MB or higher.
  
   HCPSXU - Runs during CP Initialization sets up the crash
            kernel area for CP until bounce processing occurs.
  
   HCPBOU - Changed 2 places so that bounce processing allocates
            the crashkernel area at 129 MB or higher.
  
  The following publications are updated:
   GC24-6270-03 V710 z/VM: CP Messages and Codes, and
   GC24-6177-12 V640 z/VM: CP Messages and Codes.
    -  HCP2815E Message variation 3 was added.
    -  HCP4523W Explanation and User Response was updated.
  ×**** PE20/07/23 FIX IN ERROR. SEE APAR VM66418  FOR DESCRIPTION
  

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  UM35596 UM35597 UM35598

Modules/Macros

• HCPBOU   HCPDDR   HCPLDI   HCPLOD   HCPMES   HCPMESA  HCPMESB
  HCPMFN   HCPMXRBK HCPPCT   HCPSAL   HCPSDT   HCPSXU   HCP2815E
  HCP4523W
  

Fix information

• Fixed component name

  VM CP

• Fixed component ID

  568411202

Applicable component levels

• RA64 PSY UM35812

     UP21/02/17 I 1000 ¢

• R640 PSY UM35597

     UP20/02/19 I 1000 ¢

• R710 PSY UM35598

     UP20/02/19 P 2101 ¢

Fix is available

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