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Subject: Re: [PATCH 00/34] x86: Memory Protection Keys (v5)
To: Andy Lutomirski <luto@amacapital.net>
References: <20151204011424.8A36E365@viggo.jf.intel.com>
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From: Dave Hansen <dave@sr71.net>
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Date: Fri, 4 Dec 2015 15:38:41 -0800
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On 12/04/2015 03:31 PM, Andy Lutomirski wrote:
> On Thu, Dec 3, 2015 at 5:14 PM, Dave Hansen <dave@sr71.net> wrote:
>> 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!