IPTE Instruction Fixed; Further Improvements for CTCE Device now supporting z/VM SSI ISFC and RSCS NJE links #50
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z/VM DASD with CCUU addresses where only the CC part was different ended up with identical EQID's which was wrong. This is now corrected.
…inks In addition to corrections and stability improvements, z/VM SSI ISFC links as well as RSCS NJE links are now also supported.
TLB guest entries under SIE for DAT-OFF guests (like CMS) were discovered to never be invalidated ! This was causing CCW Opcode X'00' being generated by the TCPIP service machine under z/VM, may have caused other intermittent z/VM and CMS anomalies as well.
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Roger,
This is an improved version of two earlier pull request which now includes additional code simplifications and stability improvements after I was able to test all CTCE functionality also under z/VM both under Spinhawk and Hyperion. (I closed the two earlier pull requests to avoid confusion.)
The z/VM DASD EQID fix is also again included in this pull request.
But the most important fix might very well be the correction to the IPTE instruction in "dat.h", which was observed to NEVER invalidate guestregs TLB entries for DAT-OFF guests like CMS. This caused intermittent problems under z/VM. The most frequently occurring problem was that the VM service engine TCPIP (which runs as a CMS guest) did not always start up correctly. But I strongly suspect that a number of other intermittent and not easy reproducible errors under z/VM were also caused by this IPTE problem.
Best regards,
Peter