From: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
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
One outstanding issue is the language and behavior for the
PKEY_DISABLE_ACCESS/WRITE flags. Should the manpage describe
the acceptable number of flags as "zero or more" or "zero or
one"?
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 five new system calls to support this feature.
The five calls are distributed across three man-pages (one existing
and 2 new), plus a new pkey(7) page which serves as a general
overview of the feature.
The system calls for this feature are not currently upstream but
can be found here:
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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