VM66819: Z/VM 7.4 CP: FIX PACK - FEATURE 00 FIX 06

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• This APAR contains required service for z/VM version 7 release
  4.
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  
  * USERS AFFECTED: All users of z/VM                            *
  
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  * PROBLEM DESCRIPTION:                                         *
  
  ****************************************************************
  
  * RECOMMENDATION: APPLY PTF                                    *
  
  ****************************************************************
  
  This is the APAR for z/VM 7.4 Fix Pack 6. It contains fixes for
  the following three problems:
  
  Problem 1:
  GUEST RELOCATION INCOMPATIBILITY
  
  Live guest relocation (LGR) errors can occur for guests in
  certain hardware migration scenarios when introducing new
  versions of IBM Z hardware. This is due to a potential
  change in a value returned by the hardware which is used
  to determine the architecture level for associated guests.
  
  -----
  
  Problem 2:
  UNPLANNED HYPERSWAP ON SUBCHANNEL OFFLINE DEVICE
  
  Unnecessary HyperSwap auto-quiesce swap trigger is taken during
  a z/VM host initiated I/O request to a subchannel offline
  (SUBCHOFF) device.  The I/O error received in this state is not
  due to a hardware problem on the associated device but simply
  because of the architected state of the device at the time.  No
  unplanned swap should take place due to such an event.
  
  -----
  
  Problem 3:
  PRG006 ENCOUNTERED DUE TO IMPROPER INSTRUCTION INPUT
  
  CP abends with a PRG006 when an incorrect input is issued on a
  confidential instruction. The fix, related to base code,
  corrects the input and CP does not abend. Those with guests
  attached to integrated consoles, that are likely sick, may
  be affected.
  

Problem conclusion

• Problem 1:
  GUEST RELOCATION INCOMPATIBILITY
  
  Internal handling of the architected value of interest was
  updated to prevent the relocation errors related to
  potential architectural incompatibility introduced to the guest.
  
  
  This fix should be applied on all members of an SSI cluster
  to avoid potential live guest relocation compatibility issues.
  If not applied concurrently across an SSI cluster, use of the
  FORCE ARCHITECTURE option of the VMRELOCATE command may be
  required to relocate guests to updated members.
  
  -----
  
  Problem 2:
  UNPLANNED HYPERSWAP ON SUBCHANNEL OFFLINE DEVICE
  
  To ensure this incorrect HyperSwap trigger no longer occurs,
  a set of changes were made to improve the CC3 error recovery
  path and prevent subchannel offline (SUBCHOFF) devices from
  persisting in a GDPS environment enabled for HyperSwap
  auto-quiesce. - CC3 error recovery was updated to no longer
  create SVM
    records for GDPS if the affected device is SUBCHOFF.
  - HYPERSWAP ENABLE was updated to issue new message HCP6434I
    to indicate that SUBCHOFF devices cannot be enabled for
    HyperSwap auto-quiesce.
  - VARY OFF SUBCHannel was updated to also turn off the
    HyperSwap enabled indicator for the specified device. This
    prevents a device previously enabled for HyperSwap from
    entering into an unsupported state for HyperSwap. GDPS will
    recognize this change for the device and report the
    configuration error to the end user.
  - Query DASD DETAILS was updated to no longer issue I/O
    requests when the specified device is found in the SUBCHOFF
    state. The external response (I/O Error) in portions of the
    query response remains the same without making an I/O request
    which cannot complete successfully.
  
  -----
  
  Problem 3:
  PRG006 ENCOUNTERED DUE TO IMPROPER INSTRUCTION INPUT
  
  Once it was discovered the wrong input was being passed to the
  failing instruction, the input was fixed. The problem situation
  was recreated with and without the fix to ensure the abend was
  avoided.
  

Temporary fix

• FOR RELEASE VM/ESA CP/ESA R740 :
  PREREQ: VM66815
  CO-REQ: NONE
  IF-REQ: NONE
  

Comments

APAR Information

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

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

  UM90502

Modules/Macros

• HCPARD   HCPCPE   HCPCPK   HCPERR   HCPIOJ   HCPMES   HCPMESB
  HCPMXRBK HCPPCB   HCPQDE   HCPZCP   HCP6434I HYPERSWA SUBCHANN
  7VMCPR40
  

Fix information

• Fixed component name

  VM CP CP

• Fixed component ID

  568411202

Applicable component levels

• R740 PSY UM90502

     UP25/01/31 P 2501

Fix is available

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