On 02/13/2007 02:17 PM, Jeremy Fitzhardinge wrote:

Allocate a fixmap slot for use by a paravirt_ops implementation.  Xen
uses this to map the hypervisor's shared info page, which doesn't have
a pseudo-physical page number, and therefore can't be mapped
ordinarily.

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.

Dan