Messages in this thread | | | Date | Tue, 13 Feb 2007 17:36:23 -0800 | From | Jeremy Fitzhardinge <> | Subject | Re: [patch 05/21] Xen-paravirt: paravirt_ops: allocate a fixmap slot |
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Dan Hecht wrote: > Why doesn't Xen allocate the shared_info page from the pseudo-physical > space? Doesn't it already have to steal pages from the > pseudo-physical space for e.g. initial page tables, console, etc? Why > not do the same for shared_info, and then you don't need a reserve the > fixmap slot.
Unlike the pagetable pages or the console page, the shared info page doesn't have a pseudo-physical address, so in order to map it we need to directly construct a pte containing the mfn for that page. Inserting this mapping into the fixmap space seems like the easiest way to do this. It's not like a fixmap slot costs anything.
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