linux-kernel - RE: [PATCH v6 07/12] x86/head_32.S: Define start

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Message-ID: <3E5A0FA7E9CA944F9D5414FEC6C7122007715B10@ORSMSX105.amr.corp.intel.com>
Date:	Thu, 10 May 2012 20:48:38 +0000
From:	"Yu, Fenghua" <fenghua.yu@...el.com>
To:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Mallick, Asit K" <asit.k.mallick@...el.com>,
	"Luck, Tony" <tony.luck@...el.com>,
	Arjan Dan De Ven <arjan@...ux.intel.com>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	"Brown, Len" <len.brown@...el.com>,
	"Srivatssa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Randy Dunlap <rdunlap@...otime.net>,
	Chen Gong <gong.chen@...ux.intel.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-pm <linux-pm@...r.kernel.org>, x86 <x86@...nel.org>
Subject: RE: [PATCH v6 07/12] x86/head_32.S: Define start_cpu0

> -----Original Message-----
> From: H. Peter Anvin [mailto:hpa@...or.com]
> Sent: Thursday, May 10, 2012 10:31 AM
> To: Yu, Fenghua; Ingo Molnar; Thomas Gleixner; Linus Torvalds; Andrew
> Morton; Mallick, Asit K; Luck, Tony; Arjan Dan De Ven; Siddha, Suresh B;
> Brown, Len; Srivatssa S. Bhat; Randy Dunlap; Chen Gong; linux-kernel;
> linux-pm; x86
> Subject: Re: [PATCH v6 07/12] x86/head_32.S: Define start_cpu0
> 
> Can you check how this interacts with tip:x86/realmode?

When CPU0 is waken up by NMI, it's in protect mode and jumps to start_cpu0() which only sets up stack and goes to initial_code. CPU0 wake up doesn't go through trampline and starts from real mode. This is different from waking up AP when AP goes through INIT/STARTUP sequence and starts from real mode.

Thanks.

-Fenghua