linux-kernel - Re: [RFC/HACK] x86: Fast return to kernel

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Message-ID: <5363FB05.4000302@intel.com>
Date:	Fri, 02 May 2014 13:07:33 -0700
From:	"H. Peter Anvin" <h.peter.anvin@...el.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andy Lutomirski <luto@...capital.net>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [RFC/HACK] x86: Fast return to kernel

On 05/02/2014 12:51 PM, Linus Torvalds wrote:
> On Fri, May 2, 2014 at 12:31 PM, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
>>
>> Also, are you *really* sure that "popf" has the same one-instruction
>> interrupt shadow that "sti" has? Because I'm not at all sure that is
>> true, and it's not documented as far as I can tell. In contrast, the
>> one-instruction shadow after "sti" very much _is_ documented.
> 
> Yeah, I'm pretty sure about this. The only instructions with an
> interrupt shadow are "sti", "mov ss" and "pop ss".
> 

I believe you are correct here.

	-hpa

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