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

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Message-ID: <5432C62C.704@zytor.com>
Date:	Mon, 06 Oct 2014 09:41:16 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andy Lutomirski <luto@...capital.net>,
	Thomas Gleixner <tglx@...utronix.de>, X86 ML <x86@...nel.org>,
	Ingo Molnar <mingo@...hat.com>
CC:	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 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.

	-hpa


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