Re: [PATCH RFC 0/3] pagemap: make useable for non-privilege users

[Mark Williamson]

Hi Konstantin,

Thanks very much for continuing to look at this!  It's very much
appreciated.  I've been investigating from our end but got caught up
in some gnarly details of our pagemap-consuming code.

I like the approach and it seems like the information you're exposing
will be useful for our application.  I'll test the patch and see if it
works for us as-is.

Will follow up with any comments on the individual patches.

Thanks,
Mark

On Tue, May 12, 2015 at 10:43 AM, Konstantin Khlebnikov
<khlebnikov@xxxxxxxxxxxxxx> wrote:
> This patchset tries to make pagemap useable again in the safe way.
> First patch adds bit 'map-exlusive' which is set if page is mapped only here.
> Second patch restores access for non-privileged users but hides pfn if task
> has no capability CAP_SYS_ADMIN. Third patch removes page-shift bits and
> completes migration to the new pagemap format (flags soft-dirty and
> mmap-exlusive are available only in the new format).
>
> ---
>
> Konstantin Khlebnikov (3):
>       pagemap: add mmap-exclusive bit for marking pages mapped only here
>       pagemap: hide physical addresses from non-privileged users
>       pagemap: switch to the new format and do some cleanup
>
>
>  Documentation/vm/pagemap.txt |    3 -
>  fs/proc/task_mmu.c           |  178 +++++++++++++++++-------------------------
>  tools/vm/page-types.c        |   35 ++++----
>  3 files changed, 91 insertions(+), 125 deletions(-)
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