The implementation is not part of the architecture. IBM is free to use a different implementation on every model.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List [[email protected]] on behalf of Ian Worthington [[email protected]] Sent: Tuesday, November 22, 2022 11:22 AM To: [email protected] Subject: Re: Storage protection keys Yes, I understand that. What I do not understand is where they /are/ held. Is a big chunk of storage partitioned off and made unaddressable? Is the TLB actually big enough to store the entire thing (possible, but surely this memory could be better used for cache)? Is it separate storage (unlikely)? Etc. Best wishes / Mejores deseos / Meilleurs vœux Ian ... On Tuesday, November 22, 2022 at 04:57:56 PM GMT+1, Joe Monk <[email protected]> wrote: "Storage keys are not part of addressable storage." https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fpublibfp.dhe.ibm.com%2Fepubs%2Fpdf%2Fa227832d.pdf&data=05%7C01%7Csmetz3%40gmu.edu%7Cc872b320eae84e8a037708dacca5cb0d%7C9e857255df574c47a0c00546460380cb%7C0%7C0%7C638047313167339345%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=uE6Kgjvq8dkHsstnKjcIhAVrybwMguK7Uqi96ZbTYDI%3D&reserved=0 page 3-9 Joe On Tue, Nov 22, 2022 at 9:22 AM Ian Worthington < [email protected]> wrote: > Does anyone know where the storage protection keys are kept? It seems > that the processors maintain recent keys in the TLB to be accessed by the > DAT, but where do they live when they're not in the TLB? Surely we need > one byte per 4k page per address space, which could be quite a bit of > storage, so I'm assuming this has to be above the bar now? I can't see any > information in the pop about this. > > > Best wishes / Mejores deseos / Meilleurs vœux > > Ian ... > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
