From: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Changes from v4:
* Remove references to pkey_get/pkey_set since those were
removed from the code that got merged
* Updated example code to stop using pkey_get/set
Changes from v3:
* Split patches up, one per manpage.
* Started new sentences on new lines.
* Added description of default key to pkey.7
* reindented and fixed up sys_ in example code, s/err/status/,
also removed assert()s.
* Various other fixes in response to Michael's review
Changes from v2:
* clarified that calling pkey_free() on a pkey in use by
a mapping is bad.
--
Memory Protection Keys for User pages is an Intel CPU feature
which will first appear on Skylake Servers, but will also be
supported on future non-server parts (there is also a QEMU
implementation). It provides a mechanism for enforcing
page-based protections, but without requiring modification of the
page tables when an application wishes to change permissions.
I have propsed adding three new system calls to support this feature.
The three calls are distributed across two man-pages (one existing
and one new), plus a new pkey(7) page which serves as a general
overview of the feature with example code.
The system calls for this feature are in the -tip tree currently
and are expected to be merged for 4.9. I will submit the final
versions of these man-pages once the 4.9 kernel has been released.
The latest version of the code can be found here, in addition to
in the -tip tree and -next.
http://git.kernel.org/cgit/linux/kernel/git/daveh/x86-pkeys.git/
Signed-off-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: mtk.manpages@xxxxxxxxx
Cc: linux-man@xxxxxxxxxxxxxxx
Cc: linux-api@xxxxxxxxxxxxxxx
Cc: x86@xxxxxxxxxx
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