PGLBK Back to Index page
Control Block Contents 
Storage Layout 
Cross Reference (Contains links to field and bit definitions)
Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM.

  PGLBK Prolog Top of page
 DESCRIPTION: Page List Block
 FUNCTION   : Contains a list of PTE addresses that
              comprise a paging block on the destination
              system during a Live Guest Relocation
 LOCATED BY : Passed as a parameter from the Memory Move Receive
              Loop (HCPRLBRC) to the DASD Handler (HCPDOPMW)
 CREATED BY : HCPRLBRC - VMRELOCATE Memory Move Receive Loop on
              the destination system
              the destination system
 SERIALIZED : Local task serialization
 COMMENTS   : The size of this list is variable. HCPRLBRC will
              allocate enough space to hold a PTE address for
              every guest address passed from the source system
              in a "pages on DASD" Memory Move ISFC message.
              The order of the PTE addresses in the PGLBK
              corresponds to the order of the 4K buffer
              addresses passed in the 2nd-Nth message fragments
              of the ISFC message.
              HCPRLBRC may not fill the entire PGLBK:
              1) If a page included in the ISFC message is a
              state-change only, then no page content needs to be
              written for this page. (This should be rare, only
              occurring for a PGSERROR condition on the
              source system.)
              2) If HCPRLBRC cannot obtain PTE serialization,
              the corresponding PTE entry in the PGLBK will remain
              zero and the page will not be included in the paging
              block. When HCPDOPMW finds a zero PTE address in the
              PGLBK it skips the corresponding buffer address in
              the ISFC message.
  PGLBK Control Block Content Top of page

 PGLBK DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure PGLBK Page List Block 0000 0 Dbl-Word 8 PGLPTEAD PTE address (or zero if page serialization could not be obtained) 00000008 PGLENTLN *-PGLBK Length of one entry 0008 8 Dbl-Word 8 PGLNXENT (0) Next PTE address in list End of PGLBK
  PGLBK Storage Layout Top of page
*** PGLBK - Page List Block
*     +-------------------------------------------------------+
*   0 |                       PGLPTEAD                        |
*     +-------------------------------------------------------+
*** PGLBK - Page List Block
  PGLBK Cross Reference Top of page
Symbol         Dspl Value
-------------- ---- -----
PGLENTLN       0000 00000008
PGLNXENT       0008
PGLPTEAD       0000
This information is based on z/VM 6.3.0 Last updated on 22 May 2013 at 13:55:12 EDT.
Copyright IBM Corporation, 1990, 2013