linux-kernel - Re: [RFC] x86_64: A real proposal for iret-less return to kernel

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Message-ID: <537C1083.6030304@zytor.com>
Date:	Tue, 20 May 2014 19:33:39 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Andy Lutomirski <luto@...capital.net>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [RFC] x86_64: A real proposal for iret-less return to kernel

On 05/20/2014 07:27 PM, Steven Rostedt wrote:
>>
>> FWIW, if there's a way to read the NMI masking bit, this would be a
>> lot simpler.  I don't know of any way to do that, though.
> 
> Is there such a thing on all x86?
> 

It is not possible to read this bit without the assistance of SMM to the
best of my knowledge.

I'm going to do a detailed review of this proposal as soon as possible,
hopefully later tonight.

	-hpa

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