[PATCH for v4.9 LTS 38/87] Xen: ARM: Zero reserved fields of xatp before making hypervisor call

From: Jiandi An [ Upstream commit 0b47a6bd1150f4846b1d61925a4cc5a96593a541 ] Ensure all reserved fields of xatp are zero before making hypervisor call to XEN in xen_map_device_mmio(). xenmem_add_to_physmap_one() in XEN fails the mapping request if extra.res reserved

[PATCH for v4.9 LTS 38/87] Xen: ARM: Zero reserved fields of xatp before making hypervisor call

From: Jiandi An [ Upstream commit 0b47a6bd1150f4846b1d61925a4cc5a96593a541 ] Ensure all reserved fields of xatp are zero before making hypervisor call to XEN in xen_map_device_mmio(). xenmem_add_to_physmap_one() in XEN fails the mapping request if extra.res reserved field in xatp is not zero