Sharing between servers and phones

By: Christian Borntraeger (borntraeger.delete.delete@this.de.ibm.com), February 2, 2017 3:46 am
Room: Moderated Discussions
joncmu (jonathan.delete@this.alumni.cmu.edu) on February 1, 2017 1:36 pm wrote:

> z/Architecture does have the MOVE WITH OPTIONAL SPECIFICATION (MVCOS) instruction
> which the s390x port of linux does use to copy memory back and forth between
> the user address space and the kernel address space (primary and home).

Yes on zarch there have always been different address space for kernel and user, because the hardware provides fast ways of cross address space copies. This actually provided some nice separation. As there is no valid user space pointer in the kernel, there is no big need for things like SMAP. This is no 100% protection as userspace memory is still reachable via the primary mapping of the physical memory.(you would need to find out the physical address of a page, though, e.g. via page table dumping in proc on debug kernels)
>
> Program Call is one of those instructions where I never understood how it worked from reading
> the ISA definition, but only really understood once I saw how it was used by MVS/zOS.

Yes its really hard to grasp. Linux does not use it as of today.

< Previous Post in ThreadNext Post in Thread >
TopicPosted ByDate
Cray to Develop ARM-based Isambard Supercomputer for UK Met Officegallier22017/01/20 07:48 AM
  Cray to Develop ARM-based Isambard Supercomputer for UK Met Officegallier22017/01/20 07:48 AM
    Ignore second post (NT)gallier22017/01/20 07:49 AM
  ARM-based supercomputersDavid Kanter2017/01/20 02:55 PM
    ARM-based supercomputersMaynard Handley2017/01/20 08:55 PM
      ARM-based supercomputers lolRobert David Graham2017/01/21 05:34 PM
        ARM-based supercomputers lolnone2017/01/21 06:44 PM
          ARM-based supercomputers lolMaynard Handley2017/01/21 07:36 PM
            ARM-based supercomputers lolMichael S2017/01/22 02:07 AM
            What did you learn?Innocent Bystander2017/01/22 08:26 AM
          ARM-based supercomputers lolanon2017/01/22 02:24 AM
            ARM-based supercomputers lolGabriele Svelto2017/01/23 12:53 AM
              ARM-based supercomputers lolanon2017/01/23 06:40 AM
            ARM-based supercomputers loljuanrga2017/01/29 05:01 AM
              ARM-based supercomputers lolanon2017/01/29 09:35 AM
        ARM-based supercomputers lolBrendan2017/01/21 07:36 PM
         Dumb belief? ROFL (NT)juanrga2017/01/22 02:59 AM
          Dumb belief? ROFLwumpus2017/01/22 11:31 AM
            Dumb belief? ROFLjuanrga2017/01/29 05:13 AM
        ARM-based supercomputers lolDavid Kanter2017/01/22 08:20 AM
    ARM-based supercomputersRichardC2017/01/22 07:54 AM
      ARM-based supercomputersAaron Spink2017/01/22 12:03 PM
        ARM-based supercomputersNiels Jørgen Kruse2017/01/22 12:16 PM
          ARM-based supercomputersAaron Spink2017/01/23 07:01 PM
            ARM-based supercomputersNiels Jørgen Kruse2017/01/23 10:41 PM
              ARM-based supercomputerstarlinian2017/01/24 08:58 AM
                ARM-based supercomputersMichael S2017/01/24 09:05 AM
                  ARM-based supercomputersAaron Spink2017/01/24 10:38 AM
        ARM-based supercomputersdmcq2017/01/22 01:03 PM
          A73 does not have L1 ECCDavid Kanter2017/01/22 09:50 PM
            A73 does not have L1 ECCdmcq2017/01/23 03:32 PM
              A73 does not have L1 ECCMichael S2017/01/23 03:50 PM
              A73 does not have L1 ECCdmcq2017/01/24 08:15 AM
                A73 does not have L1 ECCMichael S2017/01/24 08:47 AM
          ARM SOCs with ECC DRAMMichael S2017/01/23 03:17 AM
          ARM-based supercomputersAaron Spink2017/01/23 07:02 PM
            X-Gene 3 supports 1TB of memoryvvid2017/01/24 01:55 AM
              X-Gene 3 supports 1TB of memoryWilco2017/01/24 02:13 AM
                You seem to be confusing "SoC" with "CPU core" (NT)Anon2017/01/24 03:12 AM
                X-Gene 3 supports 1TB of memoryMichael S2017/01/24 05:26 AM
                  X-Gene 3 supports 1TB of memorydmcq2017/01/24 08:28 AM
                X-Gene 3 supports 1TB of memoryAaron Spink2017/01/24 06:46 AM
                  X-Gene 3 supports 1TB of memoryWilco2017/01/24 03:10 PM
                    X-Gene 3 supports 1TB of memoryDavid Kanter2017/01/24 07:31 PM
                X-Gene 3 supports 1TB of memorySimon Farnsworth2017/01/26 02:23 AM
              X-Gene 3 supports 1TB of memoryAaron Spink2017/01/24 06:44 AM
                X-Gene 3 supports 1TB of memoryAnon2017/01/24 01:54 PM
                  X-Gene 3 supports 1TB of memoryWilco2017/01/24 03:07 PM
                    X-Gene 3 supports 1TB of memoryDavid Kanter2017/01/24 07:34 PM
                      X-Gene 3 supports 1TB of memorynone2017/01/24 10:48 PM
                        X-Gene 3 supports 1TB of memoryMichael S2017/01/25 01:32 AM
                        X-Gene 3 supports 1TB of memoryDavid Hess2017/01/25 09:47 PM
                          X-Gene 3 supports 1TB of memoryMichael S2017/01/26 12:55 AM
                            Really that different?Daniel B2017/01/26 03:37 AM
                              Really that different?none2017/01/26 05:39 AM
                                Really that different?itsmydamnation2017/01/26 03:55 PM
                                  Really that different?none2017/01/26 11:14 PM
                      X-Gene 3 supports 1TB of memoryWilco2017/01/25 03:22 AM
                        Sharing between servers and phonesDavid Kanter2017/01/25 07:15 AM
                          Sharing between servers and phonesWilco2017/01/25 04:41 PM
                            Sharing between servers and phonesDavid Kanter2017/01/25 06:10 PM
                              Sharing between servers and phonesGabriele Svelto2017/01/26 03:15 AM
                                Sharing between servers and phonesDavid Kanter2017/01/26 07:33 AM
                                  Sharing between servers and phoneswumpus2017/01/26 03:25 PM
                                    Sharing between servers and phonesDavid Kanter2017/01/27 06:46 AM
                                      Any idea why Intel doesn't ship server chips with eDRAM?Mark Roulo2017/01/27 09:02 AM
                                        Any idea why Intel doesn't ship server chips with eDRAM?Per Hesselgren2017/01/28 06:49 AM
                                          Any idea why Intel doesn't ship server chips with eDRAM?Simon Farnsworth2017/01/28 07:06 AM
                                          Any idea why Intel doesn't ship server chips with eDRAM?Michael S2017/01/29 02:43 AM
                                            off die eDRAM?wumpus2017/01/29 06:57 AM
                                              off die eDRAM?anon2017/01/29 09:46 AM
                                      Sharing between servers and phonesrwessel2017/01/27 10:36 PM
                                      Sharing between servers and phonesLinus Torvalds2017/01/28 11:49 AM
                                        Sharing between servers and phonesrwessel2017/01/29 08:56 PM
                                          Sharing between servers and phonesLinus Torvalds2017/01/30 10:01 AM
                                            Sharing between servers and phonesrwessel2017/01/31 12:29 AM
                                              Sharing between servers and phonesIreland2017/01/31 07:55 AM
                                                Please keep your posts on topicDavid Kanter2017/01/31 11:32 AM
                                                  Technology that can survive in harsh conditionsIreland2017/01/31 12:51 PM
                                                    Stay on topic, you have been warnedDavid Kanter2017/01/31 06:56 PM
                                                On topic summary and my thoughts on it. Jouni Osmala2017/01/31 01:10 PM
                                                  On topic summary and my thoughts on it. Ireland2017/01/31 01:27 PM
                                              Sharing between servers and phonesLinus Torvalds2017/01/31 01:01 PM
                                                Sharing between servers and phonesLinus Torvalds2017/01/31 01:49 PM
                                                  Sharing between servers and phonesDoug S2017/01/31 02:12 PM
                                                Sharing between servers and phonesrwessel2017/01/31 05:54 PM
                                                  Sharing between servers and phonesLinus Torvalds2017/02/01 09:17 AM
                                                    Sharing between servers and phonesrwessel2017/02/02 03:40 PM
                                                  Sharing between servers and phonesjoncmu2017/02/01 01:36 PM
                                                    Sharing between servers and phonesChristian Borntraeger2017/02/02 03:46 AM
            ARM-based supercomputersRichardC2017/01/24 05:50 AM
              ARM-based supercomputersAaron Spink2017/01/24 07:20 AM
                ARM-based supercomputersdmcq2017/01/24 08:44 AM
                  ARM-based supercomputersnone2017/01/24 09:10 AM
                  ARM-based supercomputersjuanrga2017/01/29 05:33 AM
                    ARM-based supercomputershobel2017/01/30 02:35 AM
                ARM-based supercomputersRichardC2017/01/24 09:34 AM
                  ARM-based supercomputersdmcq2017/01/24 10:10 AM
                  ARM-based supercomputersAaron Spink2017/01/24 11:01 AM
                    ARM-based supercomputersRichardC2017/01/24 04:06 PM
                      ARM-based supercomputersIreland2017/01/24 05:16 PM
                      ARM-based supercomputersAaron Spink2017/01/24 07:43 PM
                    video renderingRichardC2017/01/24 05:08 PM
                      video renderingIreland2017/01/24 05:26 PM
                      video renderingAaron Spink2017/01/24 07:54 PM
                        video renderingRichardC2017/01/25 04:26 AM
                          display bandwidthRichardC2017/01/25 05:30 AM
                          video renderingIreland2017/01/25 08:11 AM
                            You can keep a coal furnace fed all the time. (NT)anon2017/01/25 03:27 PM
                              You can keep a coal furnace fed all the time.Ireland2017/01/25 03:36 PM
                                You can keep a coal furnace fed all the time.anon2017/01/27 03:29 AM
                                  You can keep a coal furnace fed all the time.Michael S2017/01/27 07:22 AM
                                    You can keep a coal furnace fed all the time.Ireland2017/01/27 10:59 AM
                                    You can keep a coal furnace fed all the time.anon2017/01/27 03:09 PM
                                      Information and Super Materials Ireland2017/01/28 11:13 AM
                            video renderingRichardC2017/01/26 11:39 AM
                              video renderingIreland2017/01/26 12:49 PM
                                video renderingIreland2017/01/26 12:58 PM
                                video renderingRichardC2017/01/26 03:24 PM
                                  video renderingIreland2017/01/26 05:09 PM
                          video renderingGabriele Svelto2017/01/25 08:16 AM
                            video renderingIreland2017/01/25 08:33 AM
                              The challenge at Pixar Ireland2017/01/25 08:40 AM
                                Pixar story & technologyRichard Cownie2017/01/25 11:36 AM
                                  Pixar story & technologyIreland2017/01/25 11:58 AM
                          video renderingAaron Spink2017/01/25 02:49 PM
                            video renderingIreland2017/01/25 03:26 PM
                            cloud network infrastructureRichardC2017/01/26 10:47 AM
                              cloud network infrastructureAaron Spink2017/01/26 07:37 PM
                ARM-based supercomputersGabriele Svelto2017/01/24 12:40 PM
                  ARM-based supercomputersAaron Spink2017/01/24 08:00 PM
        ARM-based supercomputersRichardC2017/01/22 09:45 PM
          ARM-based supercomputersGabriele Svelto2017/01/23 01:03 AM
            ARM-based supercomputersRichardC2017/01/23 06:57 AM
      ARM-based supercomputersGabriele Svelto2017/01/23 03:23 AM
    Mont blanc project and ARM HPC in generaljuanrga2017/01/29 04:42 AM
      Juan, why do you have to be such an arrogant twat to the person who provides this forum? (NT)Annoyed2017/01/30 02:32 AM
      Still idioticDavid Kanter2017/01/30 07:49 AM
        Still idioticMr. Camel2017/01/30 08:16 PM
        Still idioticjuanrga2017/02/02 08:11 AM
      Mont blanc project and ARM HPC in generalIreland2017/01/31 04:53 PM
        Four Things to Consider Ireland2017/01/31 05:11 PM
          Four Things to Consider tarlinian2017/01/31 06:38 PM
            Four Things to Consider Ireland2017/01/31 06:58 PM
              no evidence that it goes on a shipRichardC2017/02/01 06:05 AM
                no evidence that it goes on a shipIreland2017/02/02 01:57 PM
                  no evidence that it goes on a shipRichardC2017/02/03 06:04 AM
                    no evidence that it goes on a shipIreland2017/02/03 08:02 AM
              A better place to site a supercomputerAnon2017/02/01 06:57 AM
                A better place to site a supercomputerIreland2017/02/01 06:37 PM
                  A better Ireland..Anon2017/02/01 07:52 PM
                    A better Ireland..slacker2017/02/01 10:32 PM
                    A better Ireland..Ireland2017/02/02 04:06 AM
                    He is manic (NT)anonymo2017/02/02 12:21 PM
                      or a botanon2017/02/02 02:17 PM
                        or a botanonymou52017/02/02 03:46 PM
                        or a botnone2017/02/02 10:45 PM
                          or a botanon2017/02/03 09:30 AM
                        Better bot example: amanfrommars1Doug S2017/02/03 10:44 AM
            Make allowances, the man never sleeps..Anon2017/01/31 08:22 PM
        Mont blanc project and ARM HPC in generaletudiant2017/02/02 08:39 AM
          Mont blanc project and ARM HPC in generalIreland2017/02/02 11:12 AM
            Connection between two different modelsIreland2017/02/02 11:18 AM
              Connection between two different modelsetudiant2017/02/04 02:40 PM
                Connection between two different modelsRichardC2017/02/06 08:36 AM
                  Connection between two different modelsdmcq2017/02/06 10:07 AM
                  Connection between two different modelsIreland2017/02/06 11:17 AM
                    probably not the right forum ...RichardC2017/02/06 12:31 PM
                      probably not the right forum ...Ireland2017/02/06 01:53 PM
Reply to this Topic
Name:
Email:
Topic:
Body: No Text
How do you spell green?