linux-kernel - Re: [Lguest] lguest: unhandled trap

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Message-ID: <20081020075333.GC798@elte.hu>
Date:	Mon, 20 Oct 2008 09:53:33 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Rusty Russell <rusty@...tcorp.com.au>, maluta_tiago@...oo.com.br,
	lguest@...abs.org, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org,
	Ian Campbell <Ian.Campbell@...citrix.com>
Subject: Re: [Lguest] lguest: unhandled trap


* Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> Ingo Molnar wrote:
>> i think Xen can withstand DMI scanning just fine.
>>
>> without having seen any background, my general feeling is that lguest 
>> should either do what Xen does and reserve the classic BIOS ranges 
>> that we probe - or we should make DMI scanning more robust by making 
>> sure real RAM ranges are never probed. (only ranges that the BIOS 
>> itself marks as reserved in the e820 map)
>
> We considered doing that, but decided that there was so many other 
> pieces of code around the place that assume that the ISA area is 
> special, that just reserving it was the best course of action.

yeah - for _any_ virtual machine environment it's beneficial to look as 
much like a normal PC as possible, because normal PCs is where the code 
gets tested most.

Nevertheless if this is the only current roadblock for lguest then i 
wouldnt find it objectionable to make DMI scanning more robust that way 
- the two are complimentary. [ With an initial transitionary period of 
generating printks and WARN()s when we try to scan general RAM areas. ]

	Ingo
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