VM66309: IMPROVED FICON CHPID RECOVERY FOR Z/VM GUESTS

Obtain the fix for this APAR.

APAR status

• Closed as new function.

Error description

• FICON CHPID recovery makes automatic updates to affected paths
  at VM level, but those events aren't always reflected to guests.
  
  Some FICON CHPID recovery processes make auto-updates (eg.  VARY
  ON/OFF) to the affected paths at the z/VM level, but VM doesn't
  reflect the associated events to potentially affected guests.
  This can cause additional manual intervention (eg.  VARY ON/OFF)
  at the guest level to fully recover the paths in these
  situations.
  
  The purpose of this APAR is to address some of these processes.
  

Local fix

• Use manual VARY ON/OFF PATH and DEVICE commands.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of z/VM                            *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  ****************************************************************
  * RECOMMENDATION: APPLY PTF                                    *
  ****************************************************************
  During some channel path (CHPID) recovery actions, z/VM takes
  automatic recovery actions to bring the CHPIDs back into use.
  However, these events are not surfaced to the guest which can
  result in manual intervention at the guest level being needed
  for those paths to be used by the guests again.
  

Problem conclusion

Temporary fix

• FOR RELEASE VM/ESA CP/ESA R640 :
  PREREQ: VM66166
  CO-REQ: NONE
  IF-REQ: NONE
  FOR RELEASE VM/ESACP/ESAR710 :
  PREREQ: NONE
  CO-REQ: NONE
  IF-REQ: NONE
  

Comments

• CHPID recovery routines for certain events were updated to
  present an indication to the guest so they would also be able
  to take needed recovery actions for the specified CHPID.
  
  In particular, when a machine check is received by z/VM
  indicating an I/O Resource Accessibility event has occurred,
  a similar machine check and associated data is surfaced to
  guests which are not exploiting CHPID virtualization (CHPIDV
  OFF).
  

APAR Information

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

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

  UM35671 UM35672

Modules/Macros

• HCPCCS   HCPCIO   HCPIPQBK HCPVMN
  

Fix information

• Fixed component name

  VM CP

• Fixed component ID

  568411202

Applicable component levels

• R640 PSY UM35671

     UP20/06/16 I 1000  

• R710 PSY UM35672

     UP20/06/16 P 2101  

Fix is available

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