xen/privcmd: create address space to allow writable mmaps
These are necessary to allow writeable mmap of the privcmd node to succeed without being marked read-only for writenotify purposes. Which in turn is necessary to allow mappings of foreign guest pages [ Impact: bugfix: allow writable mappings ] Signed-off-by: NIan Campbell <ian.campbell@citrix.com> Signed-off-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
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