search for: xen_hugepfn_list

...s called as a initcall. Before this function the xen_extra_mem_start points to this apparent end of the memory. In this function we reserve the PFN range for the hugepages which are going to be allocated by kernel by incrementing the xen_extra_mem_start. We maintain these PFNs as pages in "xen_hugepfn_list" in the kernel. Now before the kernel requests for hugepages, it makes a hypercall HYPERVISOR_memory_op  to get count of hugepages allocated to it and accordingly reserves the pfn range. then whenever kernel requests for hugepages it again make hypercall HYPERVISOR_memory_op to get the...