Exiting multiple threads of a simulation environment in a computer
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United States of America Patent
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Jul 12, 2016
Grant Date -
Jun 23, 2016
app pub date -
Dec 18, 2014
filing date -
Dec 18, 2014
priority date (Note) -
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Abstract
Embodiments relate to exiting a multithreaded guest virtual machine (VM) that is running in a simulation environment. An aspect includes executing the simulation by a guest entity comprising a plurality of logical threads, wherein each of the plurality of logical threads comprises a respective instruction stream. Another aspect includes detecting an exit event corresponding to completion, by a first thread of the plurality of logical threads, of the instruction stream corresponding to the first thread. Another aspect includes, based on determining that the simulation is executing in a redrive mode: based on determining that the TVM of the guest entity indicates that multiple threads of the plurality of logical threads are valid, nullifying a start interpretive execution (SIE) instruction of a host; setting a bit corresponding to the first thread in the TVM to invalid; executing the nullified SIE instruction; and relaunching the guest entity in the redrive mode.
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