linux-kernel - Re: [PATCH] VMI: remove CONFIG_DEBUG_PAGE

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Date:	Fri, 6 Jul 2007 13:40:38 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Zachary Amsden <zach@...are.com>,
	Chris Wright <chrisw@...s-sol.org>,
	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	virtualization@...ts.osdl.org,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	"Robert P. J. Day" <rpjday@...dspring.com>
Subject: Re: [PATCH] VMI: remove CONFIG_DEBUG_PAGE_TYPE and associated
	bitrotted code

* Jeremy Fitzhardinge (jeremy@...p.org) wrote:
> Zachary Amsden wrote:
> >I'd rather keep it, even with bitrot - it was non-trivial to get 
> >correct, and found many surprises in the code; most notably, it can 
> >detect
> >
> >1) PTE writes to pages not declared as page tables
> >2) Failure to allocate or de-allocate page tables using the 
> >paravirt-ops API
> >3) PTE writes using the wrong level operations
> >
> >These are most useful properties; in fact, I would like to extend the 
> >code for 64-bit paravirt-ops and 4-level paging, so rather not kill it 
> >until then.
> >
> >I never merged the whole bit upstream because it added a field to 
> >struct page. 
> 
> Hm, is that a big problem?  It would be OK for a debug config option, 
> wouldn't it?  Also, it doesn't seem particularly vmi-specific.  Could it 
> be made part of the pvops infrastructure?

I'm pretty sure lguest64 hit some of the problems Zach is trying to
catch, so should generalize well-enough.

thanks,
-chris
-
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