Re: [Xen-devel] [PATCH RFC v2 8/9] xen/arm: Implement hypercall for dirty page tracing (shadow op)

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Thu, 4 Jul 2013, Jaeyong Yoo wrote:
> > > Yes, you are right. Since there is no way to figure out this value at
> > > the moment, we use this static value here. I think we need to parse
> > > dtb of domu guest and get this value from there. Do you have any
> > suggestion?
> > 
> > The hypervisor should never be parsing (or even seeing) the domU DTB.
> > Instead the toolstack should poke this sort of information down via a
> > (presumably new) DOMCTL.
> 
> Got it. 

I wonder whether we could find the start of memory by looking at the p2m
and then storing the value in a per-domain variable to avoid a pagetable
walk every time.

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