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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 22:40 +0100
Message-ID <rab2F-8kT-13@gated-at.bofh.it> (permalink)
References <ra7Ls-6kn-19@gated-at.bofh.it> <ra7V8-6nQ-11@gated-at.bofh.it> <ra84O-6rV-7@gated-at.bofh.it> <ra8Rc-702-7@gated-at.bofh.it>
Organization Oracle Corp

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On 03/07/2016 12:16 PM, David Miller wrote:
> From: Khalid Aziz <khalid.aziz@oracle.com>
> Date: Mon, 7 Mar 2016 11:24:54 -0700
>
>> Tags can be cleared by user by setting tag to 0. Tags are
>> automatically cleared by the hardware when the mapping for a virtual
>> address is removed from TSB (which is why swappable pages are a
>> problem), so kernel does not have to do it as part of clean up.
>
> You might be able to crib some bits for the Tag in the swp_entry_t, it's
> 64-bit and you can therefore steal bits from the offset field.
>
> That way you'll have the ADI tag in the page tables, ready to re-install
> at swapin time.
>

That is a possibility but limited in scope. An address range covered by 
a single TTE can have large number of tags. Version tags are set on 
cacheline. In extreme case, one could set a tag for each set of 64-bytes 
in a page. Also tags are set completely in userspace and no transition 
occurs to kernel space, so kernel has no idea of what tags have been 
set. I have not found a way to query the MMU on tags.

I will think some more about it.

Thanks,
Khalid

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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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