auto-translated-physmap resume

auto-translated-physmap resume

[Andres Lagar-Cavilla]

Hi,
I was wondering, perhaps in my ignorance, what prevents an 
auto-translated-physmap linux guest from being suspended/resumed.
As far as I understand, there would be no need for pagetable 
canonicalization code in xc_linux_save, as well as no need for those 
mfn_to_pfn translations in pre_suspend (and viceversa in post_suspend)
Anything I am missing?

Thanks!
Andres

RE: auto-translated-physmap resume

[Ian Pratt]

> I was wondering, perhaps in my ignorance, what prevents an
> auto-translated-physmap linux guest from being suspended/resumed.
> As far as I understand, there would be no need for pagetable
> canonicalization code in xc_linux_save, as well as no need for those
> mfn_to_pfn translations in pre_suspend (and viceversa in post_suspend)
> Anything I am missing?

That's about it -- there's less to do if you're using shadow pagetables.
Since auto-translated-physmap is typically only used by various research
projects its not particularly well maintained, but its usually easy to
fix up.

Ian

Re: auto-translated-physmap resume

[Goswin von Brederlow]

"Ian Pratt" <Ian.Pratt@cl.cam.ac.uk> writes:

>> I was wondering, perhaps in my ignorance, what prevents an
>> auto-translated-physmap linux guest from being suspended/resumed.
>> As far as I understand, there would be no need for pagetable
>> canonicalization code in xc_linux_save, as well as no need for those
>> mfn_to_pfn translations in pre_suspend (and viceversa in post_suspend)
>> Anything I am missing?
>
> That's about it -- there's less to do if you're using shadow pagetables.
> Since auto-translated-physmap is typically only used by various research
> projects its not particularly well maintained, but its usually easy to
> fix up.
>
> Ian

Where can I find docs on auto-translated-physmap? Is there some
overview what it means somewhere?

MfG
        Goswin

Re: auto-translated-physmap resume

[Daniel Stodden]

On Tue, 2007-09-25 at 23:56 +0200, Goswin von Brederlow wrote:
> "Ian Pratt" <Ian.Pratt@cl.cam.ac.uk> writes:
> 
> >> I was wondering, perhaps in my ignorance, what prevents an
> >> auto-translated-physmap linux guest from being suspended/resumed.
> >> As far as I understand, there would be no need for pagetable
> >> canonicalization code in xc_linux_save, as well as no need for those
> >> mfn_to_pfn translations in pre_suspend (and viceversa in post_suspend)
> >> Anything I am missing?
> >
> > That's about it -- there's less to do if you're using shadow pagetables.
> > Since auto-translated-physmap is typically only used by various research
> > projects its not particularly well maintained, but its usually easy to
> > fix up.
> >
> > Ian
> 
> Where can I find docs on auto-translated-physmap? Is there some
> overview what it means somewhere?

comment in

http://xenbits.xensource.com/xen-3.0.4-testing.hg?file/tip/xen/include/public/features.h

might help.

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@cs.tum.edu
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