I'have just started to read the code (and I'm not an expert kernel programmer), but is this condition ok ?
(function setup_pagetables(), on file Documentation/lguest.c )
/* Ideally we map all physical memory starting at page_offset.
* However, if page_offset is 0xC0000000 we can only map 1G of physical
* (0xC0000000 + 1G overflows). */
if (mem > -page_offset)
mapped_pages = mem/getpagesize();
else
mapped_pages = -page_offset/getpagesize();
Cheers
Matias
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