linux-kernel - Re: Is espfix64's double-fault thing OK on Xen?

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Message-ID: <20140714165835.GA9969@laptop.dumpdata.com>
Date:	Mon, 14 Jul 2014 12:58:35 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Andy Lutomirski <luto@...capital.net>, david.vrabel@...rix.com
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Is espfix64's double-fault thing OK on Xen?

On Wed, Jul 09, 2014 at 04:17:57PM -0700, Andy Lutomirski wrote:
> This part in __do_double_fault looks fishy:
> 
>     cmpl $__KERNEL_CS,CS(%rdi)
>     jne do_double_fault
> 
> Shouldn't that be:
> 
>     test $3,CS(%rdi)
>     jnz do_double_fault
> 

Let me rope in David, who was playing with that recently.

> --Andy
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