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Currently it is assumed PCI device BAR access < 4G memory. If there is such a device whose BAR size is larger than 4G, it must access > 4G memory address. This patch enable the 64bits big BAR support on hvmloader. Signed-off-by: Xiantao Zhang <xiantao.zhang@intel.com> Signed-off-by: Xudong Hao <xudong.hao@intel.com> Committed-by: Keir Fraser <keir@xen.org>