linux-kernel - Re: [PATCH 00/34] x86: Memory Protection Keys (v5)

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Message-ID: <56622401.20001@sr71.net>
Date:	Fri, 4 Dec 2015 15:38:41 -0800
From:	Dave Hansen <dave@...1.net>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>, X86 ML <x86@...nel.org>,
	Linux API <linux-api@...r.kernel.org>,
	linux-arch <linux-arch@...r.kernel.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jan Kara <jack@...e.cz>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Subject: Re: [PATCH 00/34] x86: Memory Protection Keys (v5)

On 12/04/2015 03:31 PM, Andy Lutomirski wrote:
> On Thu, Dec 3, 2015 at 5:14 PM, Dave Hansen <dave@...1.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!
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