This series fixes the interface for the fbfront and kbdfront devices,
which were storing MFNs in xenstore rather than creating grant table
entries. To maintain backwards compatibility, a different xenstore key
is used (page-gref instead of page-ref) and the use of grants must be
requested for fbfront (because two levels of page references are
embedded within the shared page). This makes it possible to move a
display server out of dom0 without giving the display domain full access
to other domain's memory.
Changes since v1:
 Updated xenstore key to "feature-grants"
Updated frontend patch has been sent to qemu-devel.
[PATCH 1/3] xen-fbfront: Read width/height from backend
[PATCH 2/3] xen-fbfront: Use grant references when requested
[PATCH 3/3] xen-kbdfront: Add grant reference for shared page
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