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

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2013-07-04 at 11:29 +0100, Stefano Stabellini wrote:
> 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.

I think the toolstack should just tell the hypervisor.

Ian.


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