Re: [Xen-ia64-devel] [RFC] grant table API clean up and performancetuning memo

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

On Thu, Apr 27, 2006 at 09:34:54AM +0200, Tristan Gingold wrote:
> Le Jeudi 27 Avril 2006 04:31, Isaku Yamahata a écrit :
> [...]
> > > Two questions:
> > > It seems your mechanism still need to trust the domains.  So we need to
> > > add checks for itc/ptc.
> > >
> > > However, can a granted page be mapped several times ?
> > > If so, tracking is necessary and has a cost.
> >
> > Grant table API allows it. Xen tracks it by the counter(act->pin).
> > However current xenLinux maps one-time per a granted page, I believe.
> Even if it is mapped only once in guest physical memory, it may still be 
> mapped many times in virtual memory.  True ?

Yes, it's true.
Usually only __va()'ed address is used.

-- 
yamahata

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