On 12/04/2015 03:31 PM, Andy Lutomirski wrote:

On Thu, Dec 3, 2015 at 5:14 PM, Dave Hansen [off-list ref] wrote:

quoted

Memory Protection Keys for User pages is a CPU feature which will
first appear on Skylake Servers, but will also be supported on
future non-server parts.  It provides a mechanism for enforcing
page-based protections, but without requiring modification of the
page tables when an application changes protection domains.  See
the Documentation/ patch for more details.

What, if anything, happened to the signal handling parts?

Patches 12 and 13 contain most of it:

	x86, pkeys: fill in pkey field in siginfo
	signals, pkeys: notify userspace about protection key faults	

I decided to just not try to preserve the pkey_get/set() semantics
across entering and returning from signals, fwiw.

Also, do you have a git tree for this somewhere?  I can't actually
enable it (my laptop, while very shiny, is not a Skylake server), but
I can poke around a bit.

http://git.kernel.org/cgit/linux/kernel/git/daveh/x86-pkeys.git/

Thanks for taking a look!