xen/p2m: Allocate p2m tracking pages on override
It is possible to add a p2m override on pages that are currently mapped to INVALID_P2M_ENTRY; in particular, this will happen when using ballooned pages in gntdev. This means that set_phys_to_machine must be used instead of __set_phys_to_machine. Signed-off-by: NDaniel De Graaf <dgdegra@tycho.nsa.gov> Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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