am I supposed to be able to read this? thanks, Bonnie Bonnie Barthel | z/OS Support | IBM Strategic Outsourcing Delivery | 720.396.6755 | pager: cobon...@vtext.com
From: LINUX-390 automatic digest system <lists...@vm.marist.edu> To: LINUX-390@VM.MARIST.EDU Date: 06/03/2015 10:07 PM Subject: LINUX-390 Digest - 2 Jun 2015 to 3 Jun 2015 (#2015-104) Sent by: Linux on 390 Port <LINUX-390@VM.MARIST.EDU> There are 9 messages totalling 516 lines in this issue. Topics of the day: 1. MMIO (5) 2. RHEL Install zvm (4) ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/ ---------------------------------------------------------------------- Date: Wed, 3 Jun 2015 18:06:42 +0000 From: Neale Ferguson <ne...@sinenomine.net> Subject: MMIO TG9va2luZyBhdCB0aGUgbGF0ZXN0IGRldmVsb3BlciB3b3JrcyBkcm9wIGZyb20gdGhlIEJvZWJs aW5nZW4gZm9sa3MgSSBzZWUNCnRoaXMgbGluZSBpdGVtOg0KDQpPbiB6IFN5c3RlbXMsIGFjY2Vz cyB0byBNTUlPIG1lbW9yeSByZXF1aXJlcyBwcml2aWxlZ2VkIGluc3RydWN0aW9ucy4gVGhpcw0K cHJldmVudHMgYXBwbGljYXRpb25zIHRvIHVzZSBhcmJpdHJhcnkgbWVtb3J5IGFjY2VzcyBpbnN0 cnVjdGlvbnMgdG8gdXNlDQpNTUlPIGFzIG9uIG90aGVyIHBsYXRmb3Jtcy4gSW5zdGVhZCwgdGhp 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aGlzIGRpc2NsYWltZXIgaXMgcHJvcGVydHkgb2YgdGhlIFRUQyBhbmQgbXVzdCBub3QgYmUgYWx0 ZXJlZCBvciBjaXJjdW12ZW50ZWQgaW4gYW55IG1hbm5lci4K ------------------------------ Date: Wed, 3 Jun 2015 14:29:04 -0700 From: Alan Altmark <alan_altm...@us.ibm.com> Subject: Re: MMIO On Wednesday, 06/03/2015 at 02:08 EDT, Neale Ferguson <ne...@sinenomine.net> wrote: > Does zArchitecture still have semi-privileged instructions (I think > SSK/ISK were such beasts)? These were controlled via a control register > which made the instruction usable from userland. I thought this might be a > better option than another syscall as the last sentence means an app on > x86 will require more than just recompiling when porting to s390x. > However, given that z-MMIO uses special instructions that probably do not > have analogs in the non-z world the point is probably moot. Are these > instructions documented or are they less than open (like SIGA, SERVC, and > coupling instructions)? I'm not aware of ever having semi-privileged instructions. An instruction is either available or not (availability may be under supervisor control). If available, it is either supervisor or problem state. (And I am admonished with sharp sticks wielded by the Defenders of the Architecture whenever I raise the idea of altering that model.) Maybe you are thinking of preferred guest I/O assists? If memory serves, CP had to identify a set of devices to which SIE could directly pass I/O requests with minimal checking, and without the help of CP. Devices not on that list would trigger a mandatory intercept. All of the instructions you mention are in the unpublished part of the architecture. But those instructions are really just frameworks that describe how to interact with the target device. The content of those interactions is, as with channel-attached devices, dependent on the target. And just as with modern FICON-attached devices, the device interface is not published. Since z I/O is offloaded to special-purpose I/O processors, there must then be a mechanism to engage them. Some signalling mechanism is needed. z's privileged I/O instructions are the things that do that. Alan Altmark Senior Managing z/VM and Linux Consultant Lab Services System z Delivery Practice IBM Systems & Technology Group ibm.com/systems/services/labservices office: 607.429.3323 mobile; 607.321.7556 alan_altm...@us.ibm.com IBM Endicott ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/ ------------------------------ Date: Wed, 3 Jun 2015 21:50:59 +0000 From: Neale Ferguson <ne...@sinenomine.net> Subject: Re: MMIO Check your 370 reference card IPK, IVSK, EPAR and ESAR are defined as semi-= privileged. I think 390 also had them. -------- Original message -------- From: Alan Altmark <alan_altm...@us.ibm.com> Date: 2015/06/03 17:30 (GMT-05:00) To: LINUX-390@VM.MARIST.EDU Subject: Re: [LINUX-390] MMIO On Wednesday, 06/03/2015 at 02:08 EDT, Neale Ferguson <ne...@sinenomine.net> wrote: > Does zArchitecture still have semi-privileged instructions (I think > SSK/ISK were such beasts)? These were controlled via a control register > which made the instruction usable from userland. I thought this might be a > better option than another syscall as the last sentence means an app on > x86 will require more than just recompiling when porting to s390x. > However, given that z-MMIO uses special instructions that probably do not > have analogs in the non-z world the point is probably moot. Are these > instructions documented or are they less than open (like SIGA, SERVC, and > coupling instructions)? I'm not aware of ever having semi-privileged instructions. An instruction is either available or not (availability may be under supervisor control). If available, it is either supervisor or problem state. (And I am admonished with sharp sticks wielded by the Defenders of the Architecture whenever I raise the idea of altering that model.) Maybe you are thinking of preferred guest I/O assists? If memory serves, CP had to identify a set of devices to which SIE could directly pass I/O requests with minimal checking, and without the help of CP. Devices not on that list would trigger a mandatory intercept. All of the instructions you mention are in the unpublished part of the architecture. But those instructions are really just frameworks that describe how to interact with the target device. The content of those interactions is, as with channel-attached devices, dependent on the target. And just as with modern FICON-attached devices, the device interface is not published. Since z I/O is offloaded to special-purpose I/O processors, there must then be a mechanism to engage them. Some signalling mechanism is needed. z's privileged I/O instructions are the things that do that. Alan Altmark Senior Managing z/VM and Linux Consultant Lab Services System z Delivery Practice IBM Systems & Technology Group ibm.com/systems/services/labservices office: 607.429.3323 mobile; 607.321.7556 alan_altm...@us.ibm.com IBM Endicott ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or vi= sit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/ ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/ ------------------------------ Date: Wed, 3 Jun 2015 17:06:03 -0700 From: Alan Altmark <alan_altm...@us.ibm.com> Subject: Re: MMIO On Wednesday, 06/03/2015 at 05:54 EDT, Neale Ferguson <ne...@sinenomine.net> wrote: > Check your 370 reference card IPK, IVSK, EPAR and ESAR are defined as > semi-privileged. I think 390 also had them. Yes, it did. I stand corrected! The next time the Defenders get out their pointy little sticks, I'm going to drag out this particular chainsaw. Alan Altmark Senior Managing z/VM and Linux Consultant Lab Services System z Delivery Practice IBM Systems & Technology Group ibm.com/systems/services/labservices office: 607.429.3323 mobile; 607.321.7556 alan_altm...@us.ibm.com IBM Endicott ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/ ------------------------------ Date: Thu, 4 Jun 2015 00:14:14 +0000 From: Neale Ferguson <ne...@sinenomine.net> Subject: Re: MMIO I think it's an excellent method of providing a finer grained mechanism of = privileges rather than just yes or no (recall the initial UNIX model had ri= ngs of privileges or was that just Dante and the Seven levels of hell?). In= any event it makes sense in z where you don't want a TSO task being able t= o do memory mapped i/o but would like a Linux process to be allowed to do s= o. What do we want? Semi privileges! When do we want it? Sometimes! -------- Original message -------- From: Alan Altmark <alan_altm...@us.ibm.com> Date: 2015/06/03 20:07 (GMT-05:00) To: LINUX-390@VM.MARIST.EDU Subject: Re: [LINUX-390] MMIO On Wednesday, 06/03/2015 at 05:54 EDT, Neale Ferguson <ne...@sinenomine.net> wrote: > Check your 370 reference card IPK, IVSK, EPAR and ESAR are defined as > semi-privileged. I think 390 also had them. Yes, it did. I stand corrected! The next time the Defenders get out their pointy little sticks, I'm going to drag out this particular chainsaw. Alan Altmark Senior Managing z/VM and Linux Consultant Lab Services System z Delivery Practice IBM Systems & Technology Group ibm.com/systems/services/labservices office: 607.429.3323 mobile; 607.321.7556 alan_altm...@us.ibm.com IBM Endicott ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or vi= sit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/ ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/ ------------------------------ End of LINUX-390 Digest - 2 Jun 2015 to 3 Jun 2015 (#2015-104) ************************************************************** ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
