From: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
Use page directory based shared buffer implementation
now available as common code for Xen frontend drivers.
Remove flushing of shared buffer on page flip as this
workaround needs a proper fix.
Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
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