A fix is available
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 number
VM66425
Reported component name
VM CMS
Reported component ID
568411201
Reported release
720
Status
CLOSED UR1
PE
NoPE
HIPER
NoHIPER
Special Attention
YesSpecatt / New Function / Xsystem
Submitted date
2020-07-29
Closed date
2021-02-23
Last modified date
2021-06-29
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
Fix is available
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Document Information
Modified date:
30 June 2021