linux-kernel - Re: Sanitize CPU-state when switching tasks (was sanitize CPU-state when switching from virtual-8086 mode to other task)

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Message-ID: <52D01BAC.2060909@zytor.com>
Date:	Fri, 10 Jan 2014 08:11:24 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Borislav Petkov <bp@...en8.de>
CC:	halfdog <me@...fdog.net>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ben Hutchings <ben@...adent.org.uk>
Subject: Re: Sanitize CPU-state when switching tasks (was sanitize CPU-state
 when switching from virtual-8086 mode to other task)

On 01/10/2014 03:16 AM, Linus Torvalds wrote:
> On Fri, Jan 10, 2014 at 6:06 PM, Borislav Petkov <bp@...en8.de> wrote:
>>
>> Tested-by: Borislav Petkov <bp@...e.de>
> 
> Ok, good.
> 
> Peter, do you want to take it (feel free to add my sign-off), or
> should I just commit it?
> 
> Also, is there a way to have a "likely not true" version of that
> "static_cpu_has()"? There seems to be no way to make the non-K7/K8
> case the fallthrough code.. Not that this is likely that
> performance-critical, but..
> 

I'll take it.

We don't have a "likely not true" version of static_cpu_has() at this
point... it would mean we couldn't do short jumps unfortunately (and
they would still take the false path until alternatives run.)

	-hpa


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