[Xen-devel] Re: dom0 bootstrap for xenstore

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 16 Jun 2005, at 16:54, Mike Wray wrote:

> > Ah, it's not working because xc_map_foreign_range does not raise 
> > refcnts on the page being mapped. unmap_range then does the right 
> > thing for foreign pages, and things like the local domain's 
> > shared_info page which is really a Xen heap page, but will do the 
> > wrong thing for ordinary pages out of the local domain's page 
> > allocator (like the xenstored page). It will try to tear down rmap, 
> > drop refcnts, atc and get itself into a mess.
> Isn't it possible to fix xc_map_foreign_range() to do the right thing 
> for
> 'ordinary' pages?
I think PageReserved will fix this so we can use xc_map_foreign_range. 
The underlying ioctl should definitely have a safety catch added, to 
avoid inadvertently mapping local non-reserved pages.
 -- Keir


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