Re: [Xen-devel] Page tables in Xen

To:	"Daniel Stodden" <stodden@xxxxxxxxxx>
Subject:	Re: [Xen-devel] Page tables in Xen
From:	"Haifeng He" <hehaifeng2nd@xxxxxxxxx>
Date:	Thu, 29 Nov 2007 14:15:58 -0700
Cc:	weiming <zephyr.zhao@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Delivery-date:	Thu, 29 Nov 2007 13:16:36 -0800
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Thanks all for the explanation.

Haifeng

On Nov 29, 2007 9:24 AM, Daniel Stodden <stodden@xxxxxxxxxx> wrote:
>
> On Thu, 2007-11-29 at 09:26 +0000, Tim Deegan wrote:
> > Hi,
> >
> > At 06:49 +0100 on 29 Nov (1196318951), Daniel Stodden wrote:
> > > On Thu, 2007-11-29 at 11:00 +0530, pradeep singh rautela wrote:
> > > > On Nov 29, 2007 1:42 AM, Haifeng He <hehaifeng2nd@xxxxxxxxx> wrote:
> > > > > Thanks for answering my question. I am talking about PV mode. What 
> > > > > about shadow
> > > > > page table? Does it mean, Xen will keep (real) copies of page tables?
> > > >
> > > > Shadown page tables are employed in HVM guests not PV guests.
> >
> > Shadow pagetables are also used when doing live migration of PV guests,
> > but they don't do the automatic translation and reference-counting that
> > they do for HVM guests.
> >
> > > regarding shadowed PV domains, there's still
> > > XENFEAT_auto_translated_physmap. but it's rather exotic and therefore
> > > rarely used.
> >
> > And therefore, AFAIK, doesn't work.
>
> Which is why people depending on it are stuck with 3.0.2.
>
>
> regards,
> Daniel
>
> --
> Daniel Stodden
> LRR     -      Lehrstuhl für Rechnertechnik und Rechnerorganisation
> Institut für Informatik der TU München             D-85748 Garching
> http://www.lrr.in.tum.de/~stodden         mailto:stodden@xxxxxxxxxx
> PGP Fingerprint: F5A4 1575 4C56 E26A 0B33  3D80 457E 82AE B0D8 735B
>
>
>

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Re: [Xen-devel] Page tables in Xen