vdpa: Make use of PFN_PHYS/PFN_UP/PFN_DOWN helper macro
it's a nice refactor to make use of PFN_PHYS/PFN_UP/PFN_DOWN helper macro Signed-off-by: NCai Huoqing <caihuoqing@baidu.com> Link: https://lore.kernel.org/r/20210802013717.851-1-caihuoqing@baidu.comAcked-by: NJason Wang <jasowang@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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