Re: [Xen-devel] Uses of &frame_table[xfn]

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 22 Dec 2005, at 23:29, Magenheimer, Dan (HP Labs Fort Collins) wrote:

> The balloon driver in xenlinux was also fixed, but I think
> this is a syntactic but not a semantic fix.  In balloon_init,
> an assumption is made that all pages below xen_start_info->nr_pages
> are valid RAM.  What if all pages of valid RAM are above
> nr_pages?  Then (I think) the balloon driver will eat up
> all the domain's RAM.  (Unlikely, but you get the drift.)
The assumption is that you are initially allocated contiguous RAM from 
pseudophys page frame 0 up to pseudophys page frame nr_pages-1.
A further assumption is that, if the max_pfn is larger than nr_pages, 
the physical space between nr_pages and max_pfn is not (yet) populated 
with RAM. Thus those pages properly belong to the balloon driver.
Are these assumptions not workable on ia64?

 -- Keir


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