NAME       : HCPVPABK
 DESCRIPTION: Virtual Page Array (Guest Relocation)
 DSECT      : VPABK
 FUNCTION   : This control block is used during Live Guest
              Relocation to accumulate a set of guest pages to be
              sent from the source system to the destination system.
              It is tightly coupled to the HCPGSBBK.
  ocated by
              - On the source system: this block is contained
              within the HCPGSBBK (see GSBVPA).
              - On the destination system: located by the first
              fragment received (host logical address).
 CREATED BY : - On the source system: Created as part of the GSBBK.
              - On the destination system: Received as the first
              fragment from ISFC and mapped in situ.
 DELETED BY : - On the source system: Deleted as part of the GSBBK.
              - On the destination system:
              1) The receive loop (HCPRLBRC) when the VPABK is
              for state changes and/or updated resident/xstore
              pages.  (VPAFLAG.VPAPWM is on.)
              2) The DASD handler (HCPDOPMW) when the VPABK is
              for updated DASD pages.  (VPAFLAG.VPAPWM is off.)
 REFERENCES : HCPRLMSG COPY
 SERIALIZED : Only one task should have the address
              of a particular VPABK.
 RELOCATION CONSIDERATIONS : None
  otes
              - The entire VPABK is transmitted from the
              source system to the destination system.
              - The VPABK is broken into two main parts.
              See each part for more information.
              - Header information
              - VPARRAY: Virtual Page Array.
              - Sample HCPUSING
              HCPUSING GSBBK,R7           Address GSBBK.
              HCPUSING VPABK,GSBVPA,GSBBK Address VPABK.
              USING RLMSG,VPAMSG          Address RLMSG.
  t*    HCPUSING RLMSG,VPAMSG,VPABK Address RLMSG.
              - HCPUSING can not be used for the RLMSG at this
              time, see 2T0K184.

 VPABK DSECT
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Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      VPABK          Virtual Page Array (Guest Relocation)
      This area is the header information.  This is transmitted
      from the source system to the destination system.
0000    0 Signed       4 VPAHEAD (0)    Start of VPA Header.
             VPAMSG is mapped by RLMSG DSECT in HCPRLMSG COPY.
0000    0 Dbl-Word     8 VPAMSG
0008    8 Signed       2 VPACURPS       Number of the memory pass in
                                        progress
000A   10 Signed       2 VPAPGCNT       Page Count. On the destination
                                        side, this will indicate the
                                        total number of entries in the
                                        VPARRAY, all of which are filled
                                        in. On the source side this will
                                        be used as a count of entries as
                                        they are filled in, while
                                        GSBPGCNT is the total number of
                                        entries.
000C   12 Signed       4 VPAASCID (0)   Address space identifier.
                                        Consists of 2 halfword index
                                        fields. A value of negative one
                                        indicates base space. (See also
                                        RLOASCID).
000C   12 Signed       2 VPAAIDOF       ASCBK ID offset. Offset into
                                        VDISK location table.
000E   14 Signed       2 VPAAIDIN       ASCBK ID index. Index into the
                                        VDIBK to get the entry for the
                                        corresponding address space.
0010   16 Dbl-Word     8 * (2)          Reserved
          00000020       VPAHDSZB       *-VPAHEAD Size of VPAHEAD in
                                        bytes.
          00000004       VPAHDSZD       (VPAHDSZB+7)/8 Size of VPAHEAD in
                                        double words.
      - VPAL is the list of Virtual Page Address List Entries.
      - Each virtual page address list entry is
        mapped by VPALE DSECT.
      - This section is transmitted from the source
        system to the destination system.
      - It is variable length in size.  On the destination side,
        its length is defined by VPAPGCNT.  On the source side,
        its length is defined by GSBPGCNT, while VPAPGCNT
        is a running count of entries as they are processed.
0020   32 Dbl-Word     8 VPARRAY (0)    Beginning of the Virtual Page
                                        Array.
      Virtual Page Address List Entry (transmitted)
      Format of double word 0
                1         2         3         4         5         6
      0123456789012345678901234567890123456789012345678901234567890123
      xdzebncstttttttt******************************--------uuaaaafrc-
      PDESA---VPAXTIME                                PDESC---PDESD---
      x = Page was in xstore on the source system
      d = Page was on DASD on the source system
      z = z bit (page logically 0)  (no page contents transmitted)
      e = page in error bit         (no page contents transmitted)
      b = Host backup change bit.
      n = Host backup reference bit.
      c = Content sent.  1=Content sent.  0=No content sent.
      s = Segment z bit.  Segment is logically zero.
      tttttttt = 8 bit timestamp for XSTORE hint information.
                 bits 17-24 of the XSTORE timestamp (delta from TOD).
      u = PGSUS
      a = key access bits
      f = key fetch protect bit
      r = guest-view reference bit
      c = guest-view change bit
      - = reserved for future use
      Format of double word 1
                1         2         3         4         5         6
      0123456789012345678901234567890123456789012345678901234567890123
      vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv------------
      v = Virtual Page address bits
      - = reserved for future use


 VPALE DSECT
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Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      VPALE          Virtual Page Array (Guest Relocation)
0000    0 Bitstring    8 VPADATA        Virtual Page Data (State, etc.)
0008    8 Address      8 VPAVPADR       Virtual Page address.
          00000010       VPAAESZB       *-VPALE Size of 1 VPALE in bytes.
          00000002       VPAAESZD       (VPAAESZB+7)/8 Size of 1 VPALE in
                                        double words.
0000    0 Bitstring    1 VPAPDESA       Page description flag byte A A
                                        page that is resident on the
                                        source system is recognized by
                                        having VPASRCX, VPASRCD, VPAVPGZ,
                                        and VPAVPGE off.
          1... ....      VPASRCX        X'80' VPASRCX Page is in XSTORE
                                        on the source system.
          .1.. ....      VPASRCD        X'40' VPASRCD Page is on DASD on
                                        the source system.
          ..1. ....      VPAVPGZ        X'20' VPAVPGZ Page logically 0
                                        (no page contents buffer
                                        transmitted)
          ...1 ....      VPAVPGE        X'10' VPAVPGE Page in error (no
                                        page contents buffer transmitted)
          .... 1...      VPAHBR         X'08' VPAHBR Host backup
                                        reference bit.
          .... .1..      VPAHBC         X'04' VPAHBC Host backup change
                                        bit.
          .... ..1.      VPACTENT       X'02' VPACTENT Content bit.
                                        Source system: Set to indicate
                                        corresponding real buffer address
                                        has a non-zero address.
                                        Destination system: Indicates if
                                        content was sent for this virtual
                                        page address.
          .... ...1      VPASEGZ        X'01' VPASEGZ The seqment
                                        beginning at the virtual page
                                        address is invalid.
0001    1 Bitstring    1 VPAXTIME       Delta timestamp for XSTORE.
0002    2 Bitstring    1 * (4)          Bits 16-47 Reserved for future
                                        use.
0006    6 Bitstring    1 VPAPDESC       Page description flag byte C
          1... ....      VPAIBR         X'80' VPAIBR Page is invalid but
                                        resident (may be on aging list or
                                        UFO) Source system: Used only on
                                        source. Destination system: Not
                                        used
          .... ..1.      VPAUS0         X'02' VPAUS0
          .... ...1      VPAUS1         X'01' VPAUS1
          .... ..11      VPAUS          VPAUS0+VPAUS1 VPAUS
0007    7 Bitstring    1 VPAPDESD       Page description flag byte D
          1111 ....      VPAACC         X'F0' VPAACC Access bits of
                                        storage key.
          .... 1...      VPAVPGF        X'08' Fetch protect bit of
                                        storage key.
          .... .1..      VPAVPGVR       X'04' Guest View reference bit
          .... ..1.      VPAVPGVC       X'02' Guest View change bit
          00FFFFFF       VPAMAXGPH      X'FFFFFFFF' Max guest page that
                                        can
          00FFF000       VPAMAXGPL      X'FFFFF000' exist for a guest to
                                        be eligible for relocation.

 
*** VPABK - Virtual Page Array (Guest Relocation)
*
*     +-------------------------------------------------------+
*   0 |                        VPAMSG                         |
*     +-------------+-------------+-------------+-------------+
*   8 |  VPACURPS   |  VPAPGCNT   |  VPAAIDOF   |  VPAAIDIN   |
*     +-------------+-------------+-------------+-------------+
*  10 |///////////////////////////////////////////////////////|
*     |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
*
*** VPABK - Virtual Page Array (Guest Relocation)
 
*** VPALE - Virtual Page Array (Guest Relocation)
*
*     +-------------------------------------------------------+
*   0 |                       VPADATA                         |
*     +-------------------------------------------------------+
*   8 |                       VPAVPADR                        |
*     +-------------------------------------------------------+
*  10
*
*** VPALE - Virtual Page Array (Guest Relocation)
 
*** Overlay for VPADATA in VPALE
*
*     +------+------+---------------------------+------+------+
*   0 |:PDESA|:XTIME|///////////////////////////|:PDESC|:PDESD|
*     +------+------+---------------------------+------+------+
*   8
*
*** Overlay for VPADATA in VPALE

 
Symbol         Dspl Value
-------------- ---- -----
VPAACC         0007 F0
VPAAESZB       0008 00000010
VPAAESZD       0008 00000002
VPAAIDIN       000E
VPAAIDOF       000C
VPAASCID       000C
VPACTENT       0000 02
VPACURPS       0008
VPADATA        0000
VPAHBC         0000 04
VPAHBR         0000 08
VPAHDSZB       0010 00000020
VPAHDSZD       0010 00000004
VPAHEAD        0000
VPAIBR         0006 80
VPAMAXGPH      0007 00FFFFFF
VPAMAXGPL      0007 00FFF000
VPAMSG         0000
VPAPDESA       0000
VPAPDESC       0006
VPAPDESD       0007
VPAPGCNT       000A
VPARRAY        0020
VPASEGZ        0000 01
VPASRCD        0000 40
VPASRCX        0000 80
VPAUS          0006 03
VPAUS0         0006 02
VPAUS1         0006 01
VPAVPADR       0008
VPAVPGE        0000 10
VPAVPGF        0007 08
VPAVPGVC       0007 02
VPAVPGVR       0007 04
VPAVPGZ        0000 20
VPAXTIME       0001