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Re: [PATCH v2] sparc64: Add support for Application Data Integrity (ADI)

From Khalid Aziz <khalid.aziz@oracle.com>
Newsgroups linux.kernel
Subject Re: [PATCH v2] sparc64: Add support for Application Data Integrity (ADI)
Date 2016-03-07 22:10 +0100
Message-ID <raazF-899-29@gated-at.bofh.it> (permalink)
References (2 earlier) <ra4Xf-4ss-7@gated-at.bofh.it> <ra5qi-4EI-5@gated-at.bofh.it> <ra5zZ-4I3-35@gated-at.bofh.it> <ra5Tk-543-3@gated-at.bofh.it> <ra7s6-5YG-11@gated-at.bofh.it>
Organization Oracle Corp

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On 03/07/2016 10:46 AM, Dave Hansen wrote:
> On 03/07/2016 08:06 AM, Khalid Aziz wrote:
>> Top 4-bits of sparc64 virtual address are used for version tag only when
>> a process has its PSTATE.mcde bit set and it is accessing a memory
>> region that has ADI enabled on it (TTE.mcd set) and a version tag was
>> set on the virtual address being accessed. These 4-bits retain their
>> original semantics in all other cases.
>
> OK, so this effectively reduces the address space of a process using the
> feature.  Do we need to do anything explicit to keep an app from using
> that address space?  Do we make sure the kernel doesn't place VMAs
> there?  Do we respect mmap() hints that try to place memory there?
>

Good questions. Isn't set of valid VAs already constrained by VA_BITS 
(set to 44 in arch/sparc/include/asm/processor_64.h)? As I see it we are 
already not using the top 4 bits. Please correct me if I am wrong.

Thanks,
Khalid

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Thread

Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) David Miller <davem@davemloft.net> - 2016-03-06 05:10 +0100
  Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Khalid Aziz <khalid.aziz@oracle.com> - 2016-03-07 16:10 +0100
    Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Rob Gardner <rob.gardner@oracle.com> - 2016-03-07 16:40 +0100
      Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Khalid Aziz <khalid.aziz@oracle.com> - 2016-03-07 16:50 +0100
      Re: [PATCH v2] sparc64: Add support for Application Data Integrity (ADI) Andy Lutomirski <luto@amacapital.net> - 2016-03-07 16:50 +0100
        Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Khalid Aziz <khalid.aziz@oracle.com> - 2016-03-07 17:10 +0100
          Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Dave Hansen <dave.hansen@linux.intel.com> - 2016-03-07 18:50 +0100
            Re: [PATCH v2] sparc64: Add support for Application Data Integrity (ADI) Andy Lutomirski <luto@amacapital.net> - 2016-03-07 19:00 +0100
              Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Dave Hansen <dave.hansen@linux.intel.com> - 2016-03-07 19:20 +0100
                Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Khalid Aziz <khalid.aziz@oracle.com> - 2016-03-07 19:50 +0100
                Re: [PATCH v2] sparc64: Add support for Application Data Integrity (ADI) Andy Lutomirski <luto@amacapital.net> - 2016-03-07 20:00 +0100
                Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) David Miller <davem@davemloft.net> - 2016-03-07 20:30 +0100
                Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Khalid Aziz <khalid.aziz@oracle.com> - 2016-03-07 20:50 +0100
                Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Dave Hansen <dave.hansen@linux.intel.com> - 2016-03-07 23:50 +0100
                Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Rob Gardner <rob.gardner@oracle.com> - 2016-03-08 02:40 +0100
            Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Khalid Aziz <khalid.aziz@oracle.com> - 2016-03-07 22:10 +0100
              Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) David Miller <davem@davemloft.net> - 2016-03-08 21:00 +0100
                Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Khalid Aziz <khalid.aziz@oracle.com> - 2016-03-08 21:20 +0100
                Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) David Miller <davem@davemloft.net> - 2016-03-08 21:30 +0100
                Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Khalid Aziz <khalid.aziz@oracle.com> - 2016-03-08 22:10 +0100
    Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) David Miller <davem@davemloft.net> - 2016-03-07 17:50 +0100
      Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Khalid Aziz <khalid.aziz@oracle.com> - 2016-03-07 19:00 +0100
    Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) David Miller <davem@davemloft.net> - 2016-03-07 18:00 +0100
      Re: [PATCH v2] sparc64: Add support for Application Data Integrity (ADI) Andy Lutomirski <luto@amacapital.net> - 2016-03-07 19:10 +0100
        Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Khalid Aziz <khalid.aziz@oracle.com> - 2016-03-07 19:30 +0100
          Re: [PATCH v2] sparc64: Add support for Application Data Integrity (ADI) Andy Lutomirski <luto@amacapital.net> - 2016-03-07 20:00 +0100
            Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) David Miller <davem@davemloft.net> - 2016-03-07 20:30 +0100
            Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Khalid Aziz <khalid.aziz@oracle.com> - 2016-03-07 20:50 +0100
              Re: [PATCH v2] sparc64: Add support for Application Data Integrity (ADI) Andy Lutomirski <luto@amacapital.net> - 2016-03-07 21:00 +0100
                Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Khalid Aziz <khalid.aziz@oracle.com> - 2016-03-07 21:50 +0100
                Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) David Miller <davem@davemloft.net> - 2016-03-07 22:00 +0100
                Re: [PATCH v2] sparc64: Add support for Application Data Integrity (ADI) Andy Lutomirski <luto@amacapital.net> - 2016-03-07 22:10 +0100
                Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Khalid Aziz <khalid.aziz@oracle.com> - 2016-03-07 22:20 +0100
                Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) James Morris <james.l.morris@oracle.com> - 2016-03-08 00:40 +0100
                Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) James Morris <james.l.morris@oracle.com> - 2016-03-08 01:00 +0100
                Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) James Morris <james.l.morris@oracle.com> - 2016-03-08 10:40 +0100
      Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Khalid Aziz <khalid.aziz@oracle.com> - 2016-03-07 19:10 +0100
        Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Rob Gardner <rob.gardner@oracle.com> - 2016-03-07 19:20 +0100
          Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Khalid Aziz <khalid.aziz@oracle.com> - 2016-03-07 19:30 +0100
            Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) David Miller <davem@davemloft.net> - 2016-03-07 20:20 +0100
              Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Khalid Aziz <khalid.aziz@oracle.com> - 2016-03-07 22:40 +0100
                Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) David Miller <davem@davemloft.net> - 2016-03-07 22:40 +0100
                Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Rob Gardner <rob.gardner@oracle.com> - 2016-03-08 00:20 +0100
                Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) David Miller <davem@davemloft.net> - 2016-03-08 05:20 +0100
                Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Rob Gardner <rob.gardner@oracle.com> - 2016-03-08 00:20 +0100
                Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Khalid Aziz <khalid.aziz@oracle.com> - 2016-03-08 00:30 +0100
              Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Khalid Aziz <khalid.aziz@oracle.com> - 2016-03-08 01:30 +0100
                Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) David Miller <davem@davemloft.net> - 2016-03-08 05:30 +0100
            Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Rob Gardner <rob.gardner@oracle.com> - 2016-03-08 00:40 +0100
        Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) David Miller <davem@davemloft.net> - 2016-03-07 20:10 +0100
          Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Khalid Aziz <khalid.aziz@oracle.com> - 2016-03-07 22:30 +0100
            Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) David Miller <davem@davemloft.net> - 2016-03-07 22:40 +0100
              Re: [PATCH v2] sparc64: Add support for Application Data Integrity  (ADI) Khalid Aziz <khalid.aziz@oracle.com> - 2016-03-07 23:40 +0100

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