linux-kernel - Re: [PATCH] Add a text

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Message-ID: <529674C4.2030906@zytor.com>
Date:	Wed, 27 Nov 2013 14:40:04 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <bp@...en8.de>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	Andi Kleen <andi@...stfloor.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] Add a text_poke syscall v2

On 11/27/2013 02:29 PM, Borislav Petkov wrote:
> On Wed, Nov 27, 2013 at 02:25:29PM -0800, H. Peter Anvin wrote:
>> Actually the CPUID is superfluous on anything than the executing CPU
>> since IRET is serializing.
> 
> Why not on the executing core too? We're IRET-ting there too.
> 
> Which would mean that a dummy empty syscall would be enough too since we
> need the serialization only.
> 

Also don't forget we need the IPIs, too...

	-hpa

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