x86,xen: introduce x86_init.mapping.pagetable_reserve
[linux-2.6.git] / arch / x86 / xen / mmu.c
index cf4ef61..0684f3c 100644 (file)
@@ -1275,6 +1275,20 @@ static __init void xen_pagetable_setup_start(pgd_t *base)
 {
 }
 
+static __init void xen_mapping_pagetable_reserve(u64 start, u64 end)
+{
+       /* reserve the range used */
+       native_pagetable_reserve(start, end);
+
+       /* set as RW the rest */
+       printk(KERN_DEBUG "xen: setting RW the range %llx - %llx\n", end,
+                       PFN_PHYS(pgt_buf_top));
+       while (end < PFN_PHYS(pgt_buf_top)) {
+               make_lowmem_page_readwrite(__va(end));
+               end += PAGE_SIZE;
+       }
+}
+
 static void xen_post_allocator_init(void);
 
 static __init void xen_pagetable_setup_done(pgd_t *base)
@@ -2105,6 +2119,7 @@ static const struct pv_mmu_ops xen_mmu_ops __initdata = {
 
 void __init xen_init_mmu_ops(void)
 {
+       x86_init.mapping.pagetable_reserve = xen_mapping_pagetable_reserve;
        x86_init.paging.pagetable_setup_start = xen_pagetable_setup_start;
        x86_init.paging.pagetable_setup_done = xen_pagetable_setup_done;
        pv_mmu_ops = xen_mmu_ops;