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Re: [PATCH v4 0/4] Application Data Integrity feature introduced by SPARC M7

From David Miller <davem@davemloft.net>
Newsgroups linux.kernel
Subject Re: [PATCH v4 0/4] Application Data Integrity feature introduced by SPARC M7
Date 2017-01-17 06:00 +0100
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References <sYtN0-Fd-21@gated-at.bofh.it> <sYu6l-Lo-1@gated-at.bofh.it>
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From: Dave Hansen <dave.hansen@linux.intel.com>
Date: Wed, 11 Jan 2017 08:33:30 -0800

> Is there a cost in the hardware associated with doing this "ADI
> checking"?  For instance, instead of having this new mprotect()
> interface, why not just always set TTE.mcd on all PTEs?

If we did this then for every page mapped into userspace we'd have
to explicitly set all of the tags to zero, otherwise we'd get TAG
mismatch exceptions.

That would be like clearing the every mapped anonymous page twice, or
worse.

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[PATCH v4 0/4] Application Data Integrity feature introduced by SPARC M7 Khalid Aziz <khalid.aziz@oracle.com> - 2017-01-11 17:20 +0100
  [PATCH v4 1/4] signals, sparc: Add signal codes for ADI violations Khalid Aziz <khalid.aziz@oracle.com> - 2017-01-11 17:20 +0100
  Re: [PATCH v4 0/4] Application Data Integrity feature introduced by  SPARC M7 Dave Hansen <dave.hansen@linux.intel.com> - 2017-01-11 17:40 +0100
    Re: [PATCH v4 0/4] Application Data Integrity feature introduced by  SPARC M7 Khalid Aziz <khalid.aziz@oracle.com> - 2017-01-11 18:00 +0100
      Re: [PATCH v4 0/4] Application Data Integrity feature introduced by  SPARC M7 Dave Hansen <dave.hansen@linux.intel.com> - 2017-01-11 19:20 +0100
        Re: [PATCH v4 0/4] Application Data Integrity feature introduced by  SPARC M7 Khalid Aziz <khalid.aziz@oracle.com> - 2017-01-11 20:00 +0100
          Re: [PATCH v4 0/4] Application Data Integrity feature introduced by  SPARC M7 Dave Hansen <dave.hansen@linux.intel.com> - 2017-01-11 20:20 +0100
            Re: [PATCH v4 0/4] Application Data Integrity feature introduced by  SPARC M7 Khalid Aziz <khalid.aziz@oracle.com> - 2017-01-12 01:30 +0100
              Re: [PATCH v4 0/4] Application Data Integrity feature introduced by  SPARC M7 Dave Hansen <dave.hansen@linux.intel.com> - 2017-01-12 01:50 +0100
                Re: [PATCH v4 0/4] Application Data Integrity feature introduced by  SPARC M7 Khalid Aziz <khalid.aziz@oracle.com> - 2017-01-12 18:00 +0100
                Re: [PATCH v4 0/4] Application Data Integrity feature introduced by  SPARC M7 Dave Hansen <dave.hansen@linux.intel.com> - 2017-01-12 19:00 +0100
                Re: [PATCH v4 0/4] Application Data Integrity feature introduced by  SPARC M7 Khalid Aziz <khalid.aziz@oracle.com> - 2017-01-13 01:30 +0100
                Re: [PATCH v4 0/4] Application Data Integrity feature introduced by  SPARC M7 Rob Gardner <rob.gardner@oracle.com> - 2017-01-13 02:40 +0100
                Re: [PATCH v4 0/4] Application Data Integrity feature introduced by  SPARC M7 Khalid Aziz <khalid.aziz@oracle.com> - 2017-01-13 15:50 +0100
                Re: [PATCH v4 0/4] Application Data Integrity feature introduced by  SPARC M7 Rob Gardner <rob.gardner@oracle.com> - 2017-01-13 16:40 +0100
                Re: [PATCH v4 0/4] Application Data Integrity feature introduced by  SPARC M7 Dave Hansen <dave.hansen@linux.intel.com> - 2017-01-13 17:10 +0100
                Re: [PATCH v4 0/4] Application Data Integrity feature introduced by  SPARC M7 Rob Gardner <rob.gardner@oracle.com> - 2017-01-13 18:40 +0100
                Re: [PATCH v4 0/4] Application Data Integrity feature introduced by  SPARC M7 Khalid Aziz <khalid.aziz@oracle.com> - 2017-01-13 17:10 +0100
        Re: [PATCH v4 0/4] Application Data Integrity feature introduced  by SPARC M7 David Miller <davem@davemloft.net> - 2017-01-17 05:50 +0100
          Re: [PATCH v4 0/4] Application Data Integrity feature introduced by  SPARC M7 Khalid Aziz <khalid.aziz@oracle.com> - 2017-01-17 22:50 +0100
    Re: [PATCH v4 0/4] Application Data Integrity feature introduced  by SPARC M7 David Miller <davem@davemloft.net> - 2017-01-17 06:00 +0100
  Re: [PATCH v4 4/4] sparc64: Add support for ADI (Application Data  Integrity) David Miller <davem@davemloft.net> - 2017-01-17 05:40 +0100
    Re: [PATCH v4 4/4] sparc64: Add support for ADI (Application Data  Integrity) Khalid Aziz <khalid.aziz@oracle.com> - 2017-01-17 20:40 +0100
      Re: [PATCH v4 4/4] sparc64: Add support for ADI (Application Data  Integrity) David Miller <davem@davemloft.net> - 2017-01-17 21:00 +0100
        Re: [PATCH v4 4/4] sparc64: Add support for ADI (Application Data  Integrity) Khalid Aziz <khalid.aziz@oracle.com> - 2017-01-17 21:20 +0100
    Re: [PATCH v4 4/4] sparc64: Add support for ADI (Application Data  Integrity) Khalid Aziz <khalid.aziz@oracle.com> - 2017-01-18 01:20 +0100

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