linux-kernel - Re: [Lguest/x86]: Clash with ioremap_nocache() + _PAGE

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Message-ID: <20080206235923.GA19843@elte.hu>
Date:	Thu, 7 Feb 2008 00:59:23 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Ahmed S. Darwish" <darwish.07@...il.com>
Cc:	Rusty Russel <rusty@...tcorp.com.au>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>, lguest@...abs.org,
	linux-kernel@...r.kernel.org
Subject: Re: [Lguest/x86]: Clash with ioremap_nocache() + _PAGE_PWT


* Ahmed S. Darwish <darwish.07@...il.com> wrote:

> Hi all,
> 
> Beginning from commit 4138cc3418f5, ioremap_nocache() sets the _PAGE_PWT
> flag. 
> 
> Lguest doesn't accept a guest pte with a _PWT flag and reports a "bad 
> page table entry" in that case.
> 
> I've removed check from lguest code and everything worked fine. Is 
> this safe from the Lguest side ?

yes, should be safe. Could you send a patch so that others can apply it 
too?

	Ingo
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