VM66425: ZCMS SUPPORT FOR VM DATA SPACE USE IN Z/ARCHITECTURE

Obtain the fix for this APAR.

APAR status

• Closed as new function.

Error description

• ZCMS changes in support of z/XC Architecture support allowing
  a z/Architecture virtual machines to exploit VM Data Spaces.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: Any user seeking to take advantage of VM     *
  *                 data space use in z/Architecture after       *
  *                 installing CP APAR VM66201 must install      *
  *                 this CMS update.                             *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  ****************************************************************
  * RECOMMENDATION: APPLY PTF                                    *
  ****************************************************************
  CP APAR VM66201 introduces z/XC Architecture Support that allows
  a z/Architecture virtual machine to exploit VM Data Spaces.
  There are changes needed in z/Architecture CMS to take full
  advantage of this function.
  

Problem conclusion

Temporary fix

Comments

• Changes have been made to
  .
    1.  save and restore only the high-order words of the 64-bit
        registers except in the Program FLIH (DMSZITP).  The
        associated data structures have been changed to reserve
        the second half of 128-byte large register save areas
        so that their sizes remain unchanged.
        .
    2.  substitute a 64-bit failing storage address in message
        DMS318T and to convert an eight-byte failing storage
        address to an ESA/390-compatible four-byte address if
        the high-order four bytes are zero.  Data structure
        changes are made to the z/Architecture version of NUCON
        to correct the failing storage address size.
        .
    3.  provide a 128-byte static save area containing the 64-bit
        registers to the CMS Multitasking first level interrupt
        handler.
        .
    4.  If issuing IPL ZCMS in more than 128G of virtual storage,
        the ZCMS initialization code now sets the ZCMS maximum
        virtual storage size to 128G. This does not affect the
        actual virtual machine storage size, but it does limit
        the amount of virtual storage available to applications
        running in ZCMS.
        .
  THE FOLLOWING CHANGES HAVE BEEN MADE TO THE SYSTEM REFERENCE
  LIBRARIES:
  ***START PUBLICATION CHANGE*************************************
  PUBLICATION TITLE: z/VM CMS and REXX/VM Messages and Codes
            RELEASE: z/VM 7.1.0     ORDER NUMBER: GC24-6255-00
  -------------------------------------------
  CHAPTER: 3     PAGE: 175
  ABSTRACT:  Update message DMS749T
  BODY:
  
  DMS749T The variations of this message are explained below.
  
  -Cannot enter z/Architecture mode - issuing SET MACHINE ESA#IPL.
  
  -Cannot run in z/Architecture mode - issuing SET MACHINE XC#IPL.
  
  Explanation:
  
  The first variation of this message indicates that
  z/Architecture CMS was IPLed in an XC-mode virtual machine whose
  architecture is incompatible with the CP implementation of XC
  support.
  
  The second variation of this message indicates that a CMS
  designed to be run in ESA/390 or ESA/XC architecture was IPLed
  in a MACHINE Z virtual machine, which supports only
  z/Architecture.
  
  System action:
  
  In both cases, the system issues the SET MACHINE command to
  reset the virtual machine architecture mode so that it is
  compatible with the version of CMS requested, and then issues
  the IPL command to re-IPL the originally specified version of
  CMS.
  
  User response:
  
  In the case of the first variation of the message, install a
  later version of CP that has z/XC support.
  
  ***END PUBLICATION CHANGE***************************************
  
  ***START PUBLICATION CHANGE*************************************
  PUBLICATION TITLE: z/VM CMS and REXX/VM Messages and Codes
            RELEASE: z/VM 7.2.0     ORDER NUMBER: GC24-6255-01
  -------------------------------------------
  CHAPTER: 3     PAGE: 185
  ABSTRACT:  Update message DMS749T
  BODY:
  
  DMS749T The variations of this message are explained below.
  
  -Cannot enter z/Architecture mode - issuing SET MACHINE ESA#IPL.
  
  -Cannot run in z/Architecture mode - issuing SET MACHINE XC#IPL.
  
  Explanation:
  
  The first variation of this message indicates that
  z/Architecture CMS was IPLed in an XC-mode virtual machine whose
  architecture is incompatible with the CP implementation of XC
  support.
  
  The second variation of this message indicates that a CMS
  designed to be run in ESA/390 or ESA/XC architecture was IPLed
  in a MACHINE Z virtual machine, which supports only
  z/Architecture.
  
  System action:
  
  In both cases, the system issues the SET MACHINE command to
  reset the virtual machine architecture mode so that it is
  compatible with the version of CMS requested, and then issues
  the IPL command to re-IPL the originally specified version of
  CMS.
  
  User response:
  
  In the case of the first variation of the message, install a
  later version of CP that has z/XC support.
  
  ***END PUBLICATION CHANGE***************************************
  

APAR Information

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

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

  UM35820 UM35821

Modules/Macros

• DMSABW   DMSABWP  DMSBKEI0 DMSDBG   DMSITM   DMSMES   DMSMESA
  DMSMESB  DMSMGC   DMSRTMSG DMSRXS   DMSRXU   DMSRXV   DMSZABE
  DMSZCIT  DMSZDBG  DMSZFRI  DMSZFRO  DMSZFRR  DMSZINS  DMSZITE
  DMSZITI  DMSZITM  DMSZITP  DMSZITS  DMSZNUC  DMSZSAB  DMSZSWF
  DMS749T  EXTSECT  EXTUAREA IKJTAIE  IOSECTPZ IOSECTZ  NUCON
  NUCONP   NUCONPZ  NUCONZ   SVCSAVEZ SVCSAVPZ SVCSECPZ SVCSECTZ
  TSOBLKS
  

Fix information

• Fixed component name

  VM CMS

• Fixed component ID

  568411201

Applicable component levels

• R710 PSY UM35820

     UP21/03/31 P 2101  

• R720 PSY UM35821

     UP21/03/31 I 1000  

Fix is available

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