+ pgd_t *npgd;
+ pud_t *npud;
+ pmd_t *npmd;
+ pte_t *npte;
+ union mm_context *mmu = &mm->context;
+ unsigned long addr, end;
+ int r, w, x;
+ struct host_vm_op ops[1];
+ void *flush = NULL;
+ int op_index = -1, last_op = sizeof(ops) / sizeof(ops[0]) - 1;
+ int ret = 0;
+
+ if(mm == NULL) return;
+
+ ops[0].type = NONE;
+ for(addr = start_addr; addr < end_addr && !ret;){
+ npgd = pgd_offset(mm, addr);
+ if(!pgd_present(*npgd)){
+ end = ADD_ROUND(addr, PGDIR_SIZE);
+ if(end > end_addr)
+ end = end_addr;
+ if(force || pgd_newpage(*npgd)){
+ ret = add_munmap(addr, end - addr, ops,
+ &op_index, last_op, mmu,
+ &flush, do_ops);
+ pgd_mkuptodate(*npgd);
+ }
+ addr = end;
+ continue;
+ }
+
+ npud = pud_offset(npgd, addr);
+ if(!pud_present(*npud)){
+ end = ADD_ROUND(addr, PUD_SIZE);
+ if(end > end_addr)
+ end = end_addr;
+ if(force || pud_newpage(*npud)){
+ ret = add_munmap(addr, end - addr, ops,
+ &op_index, last_op, mmu,
+ &flush, do_ops);
+ pud_mkuptodate(*npud);
+ }
+ addr = end;
+ continue;
+ }
+
+ npmd = pmd_offset(npud, addr);
+ if(!pmd_present(*npmd)){
+ end = ADD_ROUND(addr, PMD_SIZE);
+ if(end > end_addr)
+ end = end_addr;
+ if(force || pmd_newpage(*npmd)){
+ ret = add_munmap(addr, end - addr, ops,
+ &op_index, last_op, mmu,
+ &flush, do_ops);
+ pmd_mkuptodate(*npmd);
+ }
+ addr = end;
+ continue;
+ }
+
+ npte = pte_offset_kernel(npmd, addr);
+ r = pte_read(*npte);
+ w = pte_write(*npte);
+ x = pte_exec(*npte);
+ if (!pte_young(*npte)) {
+ r = 0;
+ w = 0;
+ } else if (!pte_dirty(*npte)) {
+ w = 0;
+ }
+ if(force || pte_newpage(*npte)){
+ if(pte_present(*npte))
+ ret = add_mmap(addr,
+ pte_val(*npte) & PAGE_MASK,
+ PAGE_SIZE, r, w, x, ops,
+ &op_index, last_op, mmu,
+ &flush, do_ops);
+ else ret = add_munmap(addr, PAGE_SIZE, ops,
+ &op_index, last_op, mmu,
+ &flush, do_ops);
+ }
+ else if(pte_newprot(*npte))
+ ret = add_mprotect(addr, PAGE_SIZE, r, w, x, ops,
+ &op_index, last_op, mmu,
+ &flush, do_ops);
+
+ *npte = pte_mkuptodate(*npte);
+ addr += PAGE_SIZE;
+ }
+
+ if(!ret)
+ ret = (*do_ops)(mmu, ops, op_index, 1, &flush);
+
+ /* This is not an else because ret is modified above */
+ if(ret) {
+ printk("fix_range_common: failed, killing current process\n");
+ force_sig(SIGKILL, current);
+ }