linux-kernel - Re: [PATCH] x86_64: Reload CS when startup

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Message-Id: <20060822110106.7582fcb9.ak@suse.de>
Date:	Tue, 22 Aug 2006 11:01:06 +0200
From:	Andi Kleen <ak@...e.de>
To:	ebiederm@...ssion.com (Eric W. Biederman)
Cc:	Magnus Damm <magnus@...inux.co.jp>, fastboot@...ts.osdl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86_64: Reload CS when startup_64 is used.

On Tue, 22 Aug 2006 02:37:44 -0600
ebiederm@...ssion.com (Eric W. Biederman) wrote:

> 
> In long mode the %cs is largely a relic.  However there are a few cases
> like lret 

You mean iret?


> +	 * jump.  In addition we need to ensure %cs is set so we make this
> +	 * a far return.	
>  	 */
>  	movq	initial_code(%rip),%rax
> -	jmp	*%rax
> +	pushq	$__KERNEL_CS
> +	pushq	%rax
> +	lretq

Ok merged thanks

-Andi
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