linux-kernel - Re: [PATCH v6 03/12] Retry fault before vmentry

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Date:	Sun, 10 Oct 2010 09:35:29 +0200
From:	Gleb Natapov <gleb@...hat.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	kvm@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, mingo@...e.hu,
	a.p.zijlstra@...llo.nl, tglx@...utronix.de, hpa@...or.com,
	riel@...hat.com, cl@...ux-foundation.org, mtosatti@...hat.com
Subject: Re: [PATCH v6 03/12] Retry fault before vmentry

On Sat, Oct 09, 2010 at 08:42:00PM +0200, Avi Kivity wrote:
>  On 10/07/2010 07:21 PM, Gleb Natapov wrote:
> >On Thu, Oct 07, 2010 at 02:29:07PM +0200, Avi Kivity wrote:
> >>   On 10/04/2010 05:56 PM, Gleb Natapov wrote:
> >>  >When page is swapped in it is mapped into guest memory only after guest
> >>  >tries to access it again and generate another fault. To save this fault
> >>  >we can map it immediately since we know that guest is going to access
> >>  >the page. Do it only when tdp is enabled for now. Shadow paging case is
> >>  >more complicated. CR[034] and EFER registers should be switched before
> >>  >doing mapping and then switched back.
> >>
> >>  With non-pv apf, I don't think we can do shadow paging.  The guest
> >Yes, with non-pv this trick will not work without tdp. I haven't even
> >considered it for that case.
> >
> 
> What about nnpt?  The same issues exist.
> 
I am not sure how nntp works. What is the problem there? In case of tdp
prefault instantiates page in direct_map, how nntp interfere with that?

--
			Gleb.
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