sev_pin_memory
src_p = sev_pin_memory(kvm, vaddr & PAGE_MASK, PAGE_SIZE, &n, 0);
dst_p = sev_pin_memory(kvm, dst_vaddr & PAGE_MASK, PAGE_SIZE, &n, FOLL_WRITE);
pages = sev_pin_memory(kvm, params.guest_uaddr, params.guest_len, &n, FOLL_WRITE);
guest_page = sev_pin_memory(kvm, params.guest_uaddr & PAGE_MASK,
guest_page = sev_pin_memory(kvm, params.guest_uaddr & PAGE_MASK,
region->pages = sev_pin_memory(kvm, range->addr, range->size, ®ion->npages,
inpages = sev_pin_memory(kvm, vaddr, size, &npages, FOLL_WRITE);