Re: [Xen-devel] run time memory trap question

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2014-02-17 at 17:38 +0200, Andrii Tseglytskyi wrote:
> Hi
> 
> >
> > > Something like this.
> >
> > This solution sounds good.
> >
> > If I remembered correctly, you are writing a driver for IPU/GPU MMU, right?
> 
> 
> Right. And for now I started developing something like shadow page
> table algorithm. I need to create a trap for a real pagetable, which
> is placed somewhere in domain heap memory. That's why I thought about
> generic algorithm which can create a runtime trap for memory, which
> address is not defined during compile time.

I think you should handle this case by making the page r/o in the p2m
and using the p2m fault handler rather than the MMIO trap
infrastructure.

See e.g. the live migration patches by Samsung.

Ian.


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