linux-kernel - Re: [PATCH v4 0/2] x86_64,entry: Clear NT on entry and speed up switch

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Message-ID: <CALCETrXp+EkMzrA2PobS2rBfNjrD+JnAEOp5bYPz_P4bsBqCjg@mail.gmail.com>
Date:	Mon, 6 Oct 2014 09:45:56 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, X86 ML <x86@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Sebastian Lackner <sebastian@...-team.de>,
	Anish Bhatt <anish@...lsio.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Chuck Ebbert <cebbert.lkml@...il.com>
Subject: Re: [PATCH v4 0/2] x86_64,entry: Clear NT on entry and speed up switch_to

On Mon, Oct 6, 2014 at 9:41 AM, H. Peter Anvin <hpa@...or.com> wrote:
> On 10/06/2014 09:39 AM, Andy Lutomirski wrote:
>> On Wed, Oct 1, 2014 at 11:49 AM, Andy Lutomirski <luto@...capital.net> wrote:
>>> Anish Bhatt noticed that user programs can set RFLAGS.NT before
>>> syscall or sysenter, and the kernel entry code doesn't filter out
>>> NT.  This causes kernel C code and, depending on thread flags, the
>>> exit slow path to run with NT set.
>>>
>>
>> Quick ping: now that the merge window is (sort of) open, what's
>> happening with these patches?
>>
>> Thanks,
>> Andy
>>
>
> My preference would be to queue them up for 3.19 since they arrived late
> in the 3.18 cycle.

I see nothing wrong with deferring patch 2 for 3.19, but deferring
patch 1, which is tagged for stable, for an entire release seems a bit
silly to me.

--Andy
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