} OFF controls the pseudo page fault portion of the VM/VS handshakinq feature. PAGEX ON or OFF should only be issued for
a viLtual machine that has the VM/VS handshaking feature It can only be specified for a virtual machine that
has the extended control mode option. PAGEX ON sets
on the Dseudo page fault portion of handshakinq; PAGEX OFF sets it off. you log on to VM/370, PAGEX is set OFF. Also, each time you IPL your virtual machine, PAGEX is set
off. If you want to use the pseudo page fault handling pOLtion of handshaking, you must issue SET PAGEX ON after you
load vour operatinq system. EMSG TEXT TIMEB controls error message handling. ON specifies that both the
error code and text are displayed at the terminal. TEXT that only text is displayed. CODE specifies that only the error code is to be displayed. OFF specifies that no error messaqe is to be displayed. When you log on VM/370, EMSG is set to TEXT. If the console is beinq spooled, the OFF setting is ignored fOL the spooled output and the full error message appears in the spooled output. The other three settinqs result in spooled output that matches the console printout. Not?: recognizes EMSG settings for all error (E), iof;rmation (I), and warning (W) messages, but iqnores the
EMSG setting and displays the complete message (error code and
text) all response (R), severe error (S), and terminal (T)
messaqes. Also, data tyPed in such as a list of names
followiinq a message, will not be controlled by the settinq. }
controls the virtual timer. ON specifies that the virtual tim2r is to be updated only when the virtual processor is
runninq. OFF specifies that the virtual timer is not to be
updated. REAL specifies that the virtual timer is to be
updated durinq virtual CPU run time and also during virtual wait time. If the REALTIMER option is specified in your VM/370 directory entry, TIMER is set to REAL when you log on;
otherwise it is set to ON when you log on.
r , FFI NIrv ,OFF, ,ON I L controls whether or not CP dispatches a virtual machine and exe=ute its programs on either the main processor or the
attached processor of an attached processor system. Normal mode is AFFINITY OFF, allowing virtual machine execution on
either processor. AFFINITY ON causes the directory to be
interroqated for an affinity setting; if there is none in the
directory, the user receives an informational message. In
uniprocessor mode, affinity is meaningless because all virtual execute on the main processor.
132 VM/37Q CP Command Reference for General Users
When affinity is in effect for a virtual machine, only the speGified processor runs the virtual machine. This is
particularly useful for virtual maGhines that require features or performance enhancements that are only available on one processor in an attached processor system. CP instructions (sach as privileged operation instructions) executed on behalf
of a virtual machine are not restricted to a processor by an
affinity settinq. CPUID bbbbbb COUID is the keyword that provides a means of setting or
changinq the CPU identification for a virtual machine. The
variable value bbbbbb represents a string of six hexadecimal
digits that permit unique identification of the :PU. This command allows the user to provide a unique CPU identification
to be stored in response to the 'STIDP' instruction. It is
necessary to associate a unique CPUID with each virtual
machine that is attached to an port since
solicited/unsolicited messages are directed to the host system by means of the CPUID. There is no checking by VM/370 to
ensure that all virtual machine using the SET CPUID command
have specified unique CPU serials. The hexadecimal field
'bbbbbb' is the CPU identification number (CPU serial).
The COU identification number (serial) is only a portion of
the complete CPUID. The CPUID identification stored in
response to a STIDP instruction is a string of 16 hexadecimal
digits as follows:
aa version code; these two digits are forced to X'FF' to identify that the virtual machine is running
under VM/370. bDbbbb - CPU identification number; this field contains six
hexadecimal digits. This is the only part of the COUlD that can be set by the DIRE:TORY OPTION control statement and modified by means of the SET CPUID command.
model number; this field contains a
digit followed by the three digits
number (0-9). This field defaults
number of the real machine.
high order 0 of the model
to the model
dada machine check extended logout; this field is forced
to x'OOOO' since CP does not reflect machine checks
back to the virtual machine. Section 5. Format of CP Commands 133
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