linux-kernel - Re: [PATCH] x86_64: make traps on 'iret' be debuggable in user space

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Date:	Thu, 07 Feb 2008 15:13:06 -0500
From:	Chuck Ebbert <cebbert@...hat.com>
To:	Roland McGrath <roland@...hat.com>
CC:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86_64: make traps on 'iret' be debuggable in user	space

On 02/05/2008 03:15 AM, Roland McGrath wrote:
>> thanks, applied. I suppose you have a testcase for this that we could try?
> 
> This should exit 0 and show "wait status 0xb7f", and does on i386.
> On 2.6.24 it exits 1 and shows "wait status 0xb".
> 
> Note, on the current tree before [PATCH] x86_64: fix iret exception recovery
> that I also posted today, this will instead produce pathological weirdness
> probably with a quick crash or silent reboot, from running with the wrong GS.
> 

Did you test without CONFIG_PARAVIRT, and CONFIG_PARAVIRT booted both with and
without the "noreplace-paravirt" parameter?

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