Xen devel - Jun 2005 - Full translate patch, with grant-table blkif support

Here''s a patch that will allow domains to run in full translate shadow 
mode, using a block driver with grant tables.  (Network drivers in 
translate mode still not implemented.)

More specifically, this patch:
  * Allows a domU to be built with CONFIG_XEN_SHADOW_TRANSLATE_MODE.  This 
basically disables access to the m2p table, takes out some of the 
mm_[un]pin optimizations.  Currently, it also adds back writing to L2 
pagetables.
  * Adds a "linuxtranslate" builder, which will build a linux domain
in
translate mode.
  * Makes some mods to the way the hypervisor handles shadow translate 
mode.  It also adds a new grant table op, "get_shared_mfn", which will
return the mfn of the first page of the grant table shared area within the 
hypervisor.
  * All references outside a hypervisor to a translated domain''s pages
must
be in gpfns, not mfns.  The hypervisor will translate from pfn to mfn for 
the mapping.  To make this easier, certain information is translated 
from mfn to gpfn before the hypervisor gives it to user space.  (For 
example, the shared_info_pfn of the domain_info struct is changed to a 
pfn, so that xcs and friends work without modification.)  Currently, other 
information (such as cr3) is not translated; so if you want to walk a 
translated domain''s page tables, you will have to translate the cr3
from
mfn to pfn before mapping it.

Let us know what you guys think.

Peace,
  -George

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