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/xen-4.10.0-shim-comet/xen/arch/x86/mm/
A Dp2m.c1598 const void *user_ptr = (const void *) buffer; in p2m_mem_paging_prep() local
1600 if ( user_ptr ) in p2m_mem_paging_prep()
1603 (!access_ok(user_ptr, PAGE_SIZE)) ) in p2m_mem_paging_prep()
1620 if ( unlikely(user_ptr == NULL) ) in p2m_mem_paging_prep()
1632 if ( !page_extant && user_ptr ) in p2m_mem_paging_prep()
1639 rc = copy_from_user(guest_map, user_ptr, PAGE_SIZE); in p2m_mem_paging_prep()

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