linux-kernel - Re: __supported_pte_mask breaks PROT

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Date:	Thu, 05 Feb 2009 10:00:35 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	"H. Peter Anvin" <hpa@...or.com>,
	William Lee Irwin III <wli@...omorphy.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>
Subject: Re: __supported_pte_mask breaks PROT_NONE pages

Ingo Molnar wrote:
> * Jeremy Fitzhardinge <jeremy@...p.org> wrote:
>
>   
>> Ingo Molnar wrote:
>>     
>>> btw., did you actually see a boot crash due to this, on a pre-PGE system?
>>>   
>>>       
>> No, under Xen, since it also disables PGE.
>>     
>
> but it was a boot crash, right? Such info is useful in the first line of a 
> commit message:
>
>   Impact: fix non-PGE boot crash
>
> (that also makes it less likely that the commit is under-prioritized.)

It's not immediate; in early usermode.  It only happens when using a 
populated PROTNONE page, which is actually pretty rare, it seems - 
perhaps made more common by the new mlock code.  But, yes, it stopped my 
machine from booting.

    J
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