Re: [Xen-devel] Page tables in Xen

To:	"Haifeng He" <hehaifeng2nd@xxxxxxxxx>
Subject:	Re: [Xen-devel] Page tables in Xen
From:	"pradeep singh rautela" <rautelap@xxxxxxxxx>
Date:	Thu, 29 Nov 2007 11:00:30 +0530
Cc:	weiming <zephyr.zhao@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
Delivery-date:	Wed, 28 Nov 2007 21:31:07 -0800
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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.
OV guests still employ p2v m2p mappings.
PV guests are aware of the virtualisation.

THanks
>
> Thanks
>
> Haifeng
>
>
> On Nov 28, 2007 7:10 AM, weiming <zephyr.zhao@xxxxxxxxx> wrote:
> > In my understanding, in PV, page table is allocated within guest OS,
> > however, every update will go through xen via explicit hypercalls.
> > in HVM, those update will be intercepted by xen.
> >
> > Please correct me if I'm wrong.
> >
> >
> >
> > On Nov 28, 2007 5:49 AM, Haifeng He <hehaifeng2nd@xxxxxxxxx> wrote:
> > >
> > >
> > >
> > > Hi,
> > >
> > > I have a question about memory page tables in Xen. As far as I
> > > understood, every modification
> > > to page table will go through Xen(hypervisor). Is it so that all page
> > > tables are actually allocated
> > > in Xen(hypervisor) instead of guest OS(domain)? Also, is it the case
> > > that Xen(hypervisor) needs to
> > > maintain a page table for each process running in every domain?
> > >
> > > Thanks
> > >
> > > Haifeng
> > >
> > >
> > > _______________________________________________
> > > Xen-devel mailing list
> > > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > > http://lists.xensource.com/xen-devel
> > >
> >
> >
>
> _______________________________________________
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> http://lists.xensource.com/xen-devel
>



-- 
--
pradeep singh rautela

"question = ( to ) ? be : ! be;"
                -- Wm. Shakespeare

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Re: [Xen-devel] Page tables in Xen