N Path Not Operational
0 Reserved
FC Function Control
AC Activity Control
SC Status Control
Count Residual Count
Details about the control blocks, that have been described here only briefly, can be found in IBM's
"z/Architecture Principles of Operation" manual.
This command specifies, whether ECPS:VM (Extended Control Program Support : Virtual Machine)
support is to be enabled and – if it is enabled – to which level. Issuing command ECPSVM HELP displays
a list of all available commands.
The purpose of ECPS:VM is to provide to the VM/370 operating system a set of shortcut facilities to per-
form hypervisor functions (CP Assists) and virtual machine simulation (VM Assists).
Although this feature does not affect VM operating system products operating in XA, ESA or z/Architec-
ture mode, it will affect VM/370 and VM/SP products running under VM/XA, VM/ESA or z/VM. Running
VM/370 and VM/SP products under VM/XA, VM/ESA or z/VM should be done with ECPS:VM disabled.
ECPS:VM should not be enabled in AP or MP environments. ECPS:VM has no effect on non-VM opera-
ting systems. It is however recommended to disable ECPS:VM when running native non-VM operating
systems.
If a specific level is given this value will be reported to the operating system when it issues a Store
ECPS:VM level but it does not otherwise alter the ECPS:VM facility operations. Please note that this is a
partial implementation.
Some of the arguments of the ECPSVM command can be abbreviated as shown in the syntax section
below.
Descriptive
elp ats able able debug [nn]]
Diagram
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ats ¬¬¬¬¬¬¬¬¬¬¬¬¬¬«
able ¬¬¬¬¬¬¬¬¬¬¬¬¬«
able ¬¬¬¬¬¬¬¬¬¬¬¬¬¬«
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debug ¬¬¬¬¬¬¬¬¬¬¬¬¬«
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nn
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